Claims:1. A multipurpose geometric instrument, comprising:
at least a first arm and a second arm;
a plug-and-play coupling unit adapted to pivotably connect a first end of the first arm to a first end of the second arm, wherein the coupling unit is further adapted to allow for disconnection of the first arm from the second arm for use as independent geometric instruments;
a sensor unit configured to measure a change in position of the first arm relative to the second arm; and
a processing circuitry operatively coupled to one or more of the first arm, the second arm, and the sensor unit, wherein the processing circuitry is configured to determine a desired geometric measurement from the measured change in position of the first arm relative to the second arm.

2. The multipurpose geometric instrument of claim 1, further comprising one or more of a ruler disposed along at least one surface of one or more of the first arm and the second arm, a pointed tip disposed at a second end of the first arm, and a writing instrument disposed at a second end of the second arm.

3. The multipurpose geometric instrument of claim 2, wherein the second arm comprises at least a partially hollow portion at the second end of the second arm to hold the writing instrument, the writing instrument comprising at least one pen, a pencil, a stylus, a chalk, or combinations thereof.

4. The multipurpose geometric instrument of claim 3, wherein the hollow portion comprises a writing core feeding mechanism having an open slot at the second end of the second arm to operate the writing instrument disposed within the writing core feeding mechanism.

5. The multipurpose geometric instrument of claim 4, wherein the writing core feeding mechanism comprises a body portion having an axially and radially extending slot and an axially extending bore adapted to receive the writing instrument, the writing instrument comprising:
a jaws member further comprising a locking groove and a plurality of jaws adapted to clamp around a writing core;
a sliding device disposed in the axially and radially extending slot with a first structural portion of the sliding member extending radially inwards into the axially extending bore in the body portion to engage with the locking groove of the jaws member and a second structural portion of the sliding member extending radially outwards from the body portion through an open slot in the second arm 103; and
at least one spring adapted to engage the sliding device and the jaws member to hold the sliding device and the jaws member axially backwards into the axially extending bore and to allow the jaws member to slide out axially only on actuation of the sliding device.

6. The multipurpose geometric instrument of claim 2, further comprising an adjustment means adapted to adjust a position of the ruler along the first arm.

7. The multipurpose geometric instrument of claim 6, wherein a designated reference position of the ruler is adjusted using the adjustment means to be coplanar with the second arm during a pivotal rotation of the second arm with respect to the first arm.

8. The multipurpose geometric instrument of claim 2, further comprising a locking device adapted to hold the ruler stationary at a desired position on the first arm.

9. The multipurpose geometric instrument of claim 2, wherein the ruler is etched on one or more surfaces of one or more of the first arm and the second arm.

10. The multipurpose geometric instrument of claim 1, wherein the sensor unit comprises a rotary actuator disposed with the plug-and-play coupling unit and configured to measure the change in the relative position of the first arm with respect to the second arm.

11. The multipurpose geometric instrument of claim 1, further comprising a user interface disposed on one or more of the first arm and the second arm, the user interface further comprising one or more of a selection means, one or more indicators, and a display device.

12. The multipurpose geometric instrument of claim 11, wherein the selection means comprises one or more electronic switches, mechanical switches, electromechanical switches, touch-screen based selection, or combinations thereof, and wherein the indicators comprise a lighting device, a light emitting diode, an audio indicator, or a touch-screen based indicator.

13. The multipurpose geometric instrument of claim 11, wherein the selection means is configured to select one or more states of operation of the multipurpose geometric instrument, activate, deactivate, and switch the multipurpose geometric instrument between different operating states, operate the multipurpose geometric instrument in a low power mode, select a desired measurement operation, and set one or more preferences for output of the desired geometric measurement and operation of the indicators.

14. The multipurpose geometric instrument of claim 11, wherein the indicators are configured to indicate one or more of a selected state of operation of the multipurpose geometric instrument and an output of various measurement operations.

15. The multipurpose geometric instrument of claim 11, wherein the processing circuitry is further configured to switch between one or more states of operation, communicate the desired measurement to an associated output device using one or more of a wired or a wireless communication link, operate the multipurpose geometric instrument in a low power mode, or combinations thereof.

16. The multipurpose geometric instrument of claim 1, further comprising a wireless communications unit operatively coupled to at least the processing circuitry and configured to wirelessly communicate the desired measurement to an output device communicatively coupled to the multipurpose geometric instrument.

17. The multipurpose geometric instrument of claim 1, wherein the plug-and-play coupling unit comprises:
a locking-unlocking unit adapted to restrict relative translational motion of the second arm with respect to the first arm in a locked state, and to detach the second arm from the said first arm in an unlocked state of the plug-and-play coupling unit; and
a sensor-engaging unit configured to engage the second arm with a rotary actuator in the sensor unit to restrict relative angular rotation between the rotary actuator and the second arm.

18. The multipurpose geometric instrument of claim 17, wherein the locking-unlocking unit comprises an axially-stamped locking-unlocking subsystem, the locking-unlocking subsystem comprising:
a hollow cylindrical extension from the second arm towards said first arm, wherein the hollow cylindrical extension comprises an annular groove at a corresponding inner lateral surface;
one or more key structures that extend from the first arm towards the second arm, the key structures comprising one or more radially protruding structures disposed at a corresponding outer lateral surface and adapted to engage and disengage from the annular groove in axially locked state and an axial unlocked state, respectively, of the locking-unlocking unit.

19. The multipurpose geometric instrument of claim 17, wherein the locking-unlocking unit comprises a radially stamped locking-unlocking subsystem.

20. The multipurpose geometric instrument of claim 1, wherein the plug-and-play coupling unit comprises a male-female type locking-unlocking subsystem, the locking-unlocking subsystem comprising one or more male structures disposed on the second arm and adapted to couple with one or more female structures disposed on the first arm using one or more of a mechanical and a magnetic coupling mechanism. , Description:
The following specification particularly describes the invention and the manner in which it is to be performed.

MULTIPURPOSE GEOMETRIC INSTRUMENT

BACKGROUND

[0001] The present specification relates generally to measurement devices, and more particularly to a multipurpose geometric instrument configured to provide a plurality of geometric operations using a single device.
[0002] Precise measurements are pivotal for successful design and execution of projects in different walks of life. Accordingly, measurement tools are widely used in construction, plumbing, medically invasive surgeries, and other technical areas to acquire accurate measurements. By way of example, measurement tools such as a compass, protractor, divider, and ruler may be used during the design and execution of various building construction projects to ensure strength and safety compliance. Typically, more than one of such tools are required for different kinds of measurements such as angle bisection and relative angle measurement. A combination of these tools, thus, is carried around in an instrument box or container to allow for different measurements needed in different scenarios. However, carrying an instrument box everywhere is cumbersome. Moreover, most measurements acquired using these tools often involve human, systematic, and/or random errors.
[0003] Certain attempts have been made towards providing multifunctional geometric instruments. These multipurpose geometric instruments typically include mechanical planar tools having a combination of features. Such combinations, for example, include a combined ruler and protractor, compass and protractor, divider and protractor, or ruler and set square. However, these multipurpose geometric instruments have complicated designs, yet provide only limited number of operations provided by a standard set of geometry box instruments. Moreover, the complicated design renders these instruments difficult to use for acquiring accurate measurements. For example, an instrument that combines a ruler and a compass, although combining two operations in one, typically provides less than accurate measurements. Specifically, using the instrument to acquire a ruler measurement, while simultaneously acquiring an angular measurement, results in occlusion of the markings on the ruler. Accordingly, a zero referencing of the corner position of the ruler is erroneous, thereby resulting in less than accurate measurements.
[0004] Certain other measurement tools employ digital means for measuring an angle or a linear distance with greater accuracy. Particularly, such digital instruments may employ a rotary and/or linear encoder as the digital means. However, these digital instruments provide only certain specific measurements, but fail to provide desired measurement functionality where both measurement and drawing movements are required. For example, a digital caliper may be used to measure internal and external distances accurately. However, the digital caliper fails to replace other functions of a ruler, a divider for drawing a line segment, and/or other geometric instruments. Conventionally available multipurpose geometric instruments, whether mechanical or digital, provide only limited functionality and accuracy, and thus are insufficient to replace a standard set of geometric box instruments.

BRIEF DESCRIPTION OF DRAWINGS

[0005] These and other features, aspects, and advantages of the claimed subject matter will become better understood when the following detailed description is read with reference to the accompanying drawings in which like characters represent like parts throughout the drawings, wherein:
[0006] FIG. 1 illustrates a perspective view of an exemplary multipurpose geometric instrument (MPGI), according to an embodiment in the present specification;
[0007] FIG. 1A illustrates a magnified view of a plug-and-play coupling unit depicted in FIG. 1;
[0008] FIG. 2 illustrates a perspective view of an embodiment of the MPGI of FIG. 1 in a closed position;
[0009] FIG. 2A illustrates a magnified view of a specific end of the MPGI of FIG. 1, when the MPGI is in the closed position;
[0010] FIG. 3 illustrates a perspective view of an embodiment of the MPGI of FIG. 1 when forming an acute angle between corresponding arms;
[0011] FIG. 4 illustrates a perspective view of an embodiment of the MPGI of FIG. 1 when forming an obtuse angle between corresponding arms;
[0012] FIG. 5 illustrates a perspective view of another embodiment of the MPGI of FIG. 1 having a wider ruler;
[0013] FIG. 6 illustrates a perspective view of an alternative embodiment of the MPGI of FIG. 1 having a ruler disposed on an inner surface of the first arm of the MPGI;
[0014] FIG. 7 illustrates a perspective view of an embodiment of the MPGI of FIG. 5 when forming an acute angle between corresponding arms;
[0015] FIG. 8 illustrates a perspective view of an embodiment of the MPGI of FIG. 5 when forming an acute angle between corresponding arms;
[0016] FIG. 9 illustrates a perspective view of an exemplary adjusting means 901, similar to the adjustment means of FIG. 1 used for adjusting a position of a ruler in the MPGI of FIG. 1;
[0017] FIG. 9A illustrates a magnified view of the adjustment means of FIG. 9;
[0018] FIG. 10 illustrates a perspective view of an alternative embodiment of an adjusting means similar to the adjusting means depicted in FIG. 1;
[0019] FIG. 11 illustrates a perspective view of yet another embodiment of the adjustment means of FIG. 10 implemented as the push to slide mechanism for the embodiment of the ruler depicted in FIG. 6;
[0020] FIG. 11A illustrates a magnified view of the push to slide mechanism of FIG. 11;
[0021] FIG. 12 illustrates a graphical representation of an exemplary use of the ruler of FIG. 6 and the writing instrument as independent devices via disassembly of a plug-and-play coupling unit in the MPGI;
[0022] FIG. 13 illustrates a magnified view of an embodiment of the plug-and-play coupling unit of FIG. 1 in a disassembled or unlocked state;
[0023] FIG. 14 illustrates an exemplary sectional view of the plug-and-play coupling unit of FIG. 13 including an axially-stamped locking-unlocking subsystem;
[0024] FIGs. 15 illustrates a perspective view of an alternative embodiment of the plug-and-play coupling unit of FIG. 13 13 including a radially-stamped locking-unlocking subsystem;
[0025] FIG. 15A illustrates another perspective view of the plug-and-play coupling unit of FIG. 15 including the radially-stamped locking-unlocking subsystem;
[0026] FIG. 16 illustrates a magnified view of yet another embodiment of the plug-and-play coupling unit of FIG. 13 including a male-female type locking-unlocking subsystem;
[0027] FIG. 17 illustrates perspective view of the writing instrument of FIG. 1 that for use in recording measurements;
[0028] FIG. 18 illustrates an exemplary unexploded view of the writing core feeding mechanism of FIG. 1;
[0029] FIG. 19 illustrates an exemplary exploded view of the writing core feeding mechanism of FIG. 1;
[0030] FIG. 20 illustrates a perspective sectional view of the writing instrument of FIG. 1;
[0031] FIG. 21 illustrates an exemplary sectional view of the writing instrument of FIG. 1 with a plurality of jaws (see FIG. 19) in a closed configuration;
[0032] FIG. 22 illustrates an exemplary sectional view of the writing instrument of FIG. 1 with a plurality of jaws (see FIG. 19) in an open configuration;
[0033] FIG. 23 illustrates an exemplary graphical representation of the user interface of FIG. 1 that allows the user to select desired measurement operations and view corresponding results;
[0034] FIG. 24 illustrates an exemplary schematic view of the processing circuitry of FIG. 1 configured to provide output information corresponding to the measurement operation performed by a user;
[0035] FIG. 25 illustrates a block diagram depicting certain exemplary inputs received by the microcontroller of FIG. 24, processing steps performed by the microcontroller, and resulting outputs; and
[0036] FIG. 26 illustrates a graphical representation of an exemplary operation logic that correlates the various inputs to corresponding outputs of FIG. 25.

SUMMARY

[0037] A multipurpose geometric instrument (MPGI) is disclosed. The MPGI includes a first arm, second arm, and a plug-and-play coupling unit adapted to pivotably connect the first arm to the second arm, where the coupling unit is adapted to allow for disconnection of the first arm from the second arm for use as independent geometric instruments. The MPGI further includes a sensor unit configured to measure a change in position of the first arm relative to the second arm. Additionally, the MPGI includes a processing circuitry operatively coupled to one or more of the first arm, the second arm, and the sensor unit, where the processing circuitry is configured to determine a desired geometric measurement from the measured change in position of the first arm relative to the second arm.

DETAILED DESCRIPTION

[0038] The following description presents an exemplary multipurpose geometric instrument (MPGI) that provides functionalities of a plurality of geometric instruments that typically form part of a standard geometry box. Particularly, the MPGI combines functionality of a plurality of geometric instruments such as a compass, protractor, divider, setsquares, ruler, and writing instrument into a single portable instrument that employs a digital processing unit for providing substantially error-free measurements.
[0039] FIG. 1 depicts an exemplary embodiment of an MPGI 100 for providing a plurality of measurement operations via a single portable measurement device. In certain embodiments, the MPGI 100 includes a first arm 102 that is operatively coupled to a second arm 103 via a plug-and-play coupling unit 104. The plug-and-play coupling unit 104 is adapted to allow for disconnection of the first arm from the second arm such that, upon disconnection, each of the first and second arms can be used as an independent geometric instrument. An embodiment of the plug-and-play coupling unit 104 for use in the MPGI 100 will be described in greater detail with reference to FIGs. 12-16.
[0040] In one embodiment, the plug-and-play coupling unit 104 pivotably connects a first end 105 of the first arm 102 with a first end 106 of the second arm 103 to provide functionality corresponding to a compass and/or a divider. Accordingly, the first arm 102 includes a pointed tip 107 at a second end 108 of the first arm 102. Additionally, the second arm 103 includes a writing instrument 109 disposed near a second end 110 of the second arm 103. Although, FIG. 1 depicts a single writing instrument, in certain embodiments, in certain embodiments, more than one writing instrument 109 may be used in the MPGI 100. This writing instrument 109, for example, may include a pen, a pencil, a chalk, a brush, a stylus, and/or any other suitable electronic and/or conventional instrument that may be used, for example, for writing, drawing, and/or painting. In one presently contemplated implementation, the writing instrument 109 includes a writing core 111 and a writing core feeding mechanism 112 adapted to receive one or more writing cores 111. Certain exemplary configurations of the writing instrument 109 including the writing core feeding mechanism 112 will be described in greater detail with reference to FIGs. 17-22.
[0041] In certain embodiments, the MPGI 100 may further include at least one ruler 113 supported on the first arm 102 of the MPGI 100 to aid in measuring distances between different points. In one embodiment, the ruler 113 may be immovably fixed to the first arm 102 and/or the second arm 103. In another embodiment, the ruler 113 may be implemented as markings available on one or more inner and/or outer surfaces of the first arm 102 and/or the second arm 103 to aid in measurement in different positions and/or orientations of the MPGI 100.
[0042] In certain further embodiments, the ruler 113 is coupled to the first arm 102 and/or the second arm 103 via an adjustment means 114. The adjustment means 114 allows adjusting a “zero position” 115 (for example, a designated reference position for measurements) on the ruler 113 to be coplanar, for example, with an inner surface 116 of the second arm 103 during a pivotal rotation of the second arm 103 with respect to the first arm 102. In certain embodiments, the adjustment means 114 may further include a locking device (not shown) adapted to hold the ruler 113 stationary at the zero position 115. The locking device, for example, may include a pin lock, a notch lock, a spring lock, a cam lock, or any other suitable locking mechanism such as available with other adjusting, sliding, and/or zipping mechanisms. Adjusting the zero position 115 allows a user to draw and measure any angle formed by the first arm 102 and the second arm 103 with respect to the zero position 115, while avoiding occlusion-related zero-reference errors typically seen in conventional multipurpose measuring instruments including rulers. Certain examples of the ruler 113 and related mechanisms will be described in greater detail with reference to FIGs. 5-8.
[0043] Further, in certain embodiments, the MPGI 100 also includes a user interface (UI) 117, for example located on the first arm 102, for allowing selection of different functional units such as the ruler 113 and the compass for different measurement tasks. Additionally, the UI 117 may also output the measurement values determined using the various functional units. To that end, the UI 117 includes selection means 118 that allow a user to select a functional unit and corresponding operation, one or more indicators 119 for providing indications related to different states of operation, and/or a display device 120 for providing measurement data.
[0044] In one embodiment, the MPGI 100 includes a sensor 121 for acquiring measurement data corresponding to various geometric operations, such as distance measurement, angle measurement, and angular bisections, selected using the UI 117. The sensor 121, for example, includes a potentiometer, a linear encoder, a rotary encoder, a capacitive sensor, a resistive sensor, an inductive sensor, a magnetic sensor, and/or other suitable devices adapted to measure linear and rotary positions. An example of the sensor 121 and corresponding components is depicted in FIG. 1 A.
[0045] Specifically, FIG. 1A depicts a magnified view of the plug-and-play coupling unit 104 (see FIG. 1). In the embodiment depicted in FIG. 1A, the sensor 121 includes a rotary actuator 122 for acquiring measurement data corresponding to a relative positions and/or orientation of the first arm 102 with respect to the second arm 103. To that end, the sensor 121 is pivotably sandwiched between the first arm 102 and the second arm 103 such that a body 123 of the sensor 121 is attached to the first arm 102, whereas the rotary actuator 122 is connected to the second arm 103. The rotary actuator 122, for example, may include a rotatable shaft having a D-cut or other irregular cross-section that is adapted to pivotably connect to the second arm 103. The plug-and-play coupling unit 104, connecting the first arm 102 to the second arm 103, allows a linear proportional rotation of the rotary actuator 122 corresponding to any pivotal rotation between the first arm 102 and the second arm 103.
[0046] Referring again to FIG. 1, in one embodiment, the MPGI 100 includes a processing circuitry 124 that is communicatively coupled to the sensor 121 and/or the rotary actuator 122 to convert the linear proportional rotation of the rotary actuator 122, for example, into a desired angle or distance measurement. To that end, the processing circuitry 124 includes, for example, a microprocessor, a microcontroller, a field programmable gate array, digital gates, transistors, and other suitable processing devices.
[0047] In one embodiment, the processing circuitry 124 may be disposed within the first arm 102 or the second arm 103, which is electrically connected with the sensor 121 and the UI 117. Alternatively, the processing circuitry 124 may be disposed within the plug-and-play coupling unit 104. Additionally, in certain embodiments, the processing circuitry 124 may include operational logic, embedded therein, to execute various functions. The functions, for example, include determining measurements corresponding to detected movements of the first arm 102, the second arm 103, and/or the rotary actuator 122, switching between different states-of-operation of the MPGI 100, and/or operating the MPGI 100 in a low power mode.
[0048] Use of the processing circuitry 124, the sensor 121, and the plug-and-play coupling unit 104 make the MPGI 100 a superlative device that combines functionalities of a plurality of measurement devices into a single easy to carry portable device. Additionally, the sensor 121 and the processing circuitry 124 together provide accurate measurements that may be further shared automatically or semi-automatically with other devices, for example, for use in building design applications. To that end, in one embodiment, the MPGI 100 may include a Bluetooth module, or any other wireless communications module, for example disposed within the plug-and-play coupling unit 104, to communicate the measurements to other devices. Certain exemplary embodiments of the MPGI 100 and corresponding components adapted to provide accurate values for different measurement tasks will be described in greater detail with reference to FIGs. 2-26.
[0049] FIG. 2 depicts a perspective view 200 of an embodiment of the MPGI 100 of FIG. 1 in a closed position. Further FIG. 2A depicts a magnified view 200A of the second end 108 of the first arm 102 and the second end 110 of the second arm 103 when the MPGI 100 is in the closed position. In the closed position, a bottom surface 201 of the second arm 103 rests on a top surface 202 of the ruler 113. Accordingly, even in the closed position, the ruler 113 does not obstruct the second arm 103 of the MPGI 100, as there is a vertical gap 203 between the ruler 113 and the second arm 103.
[0050] FIG. 3 depicts a perspective view 300 of an embodiment of the MPGI 100 of FIG. 1 when forming an acute angle 301 between the first arm 102 and the second arm 103. In the embodiment depicted in FIG. 3, the zero position 115 of the ruler 113 is adjusted, as shown, to be coplanar with the inner surface 116 the second arm 103.
[0051] FIG. 4 depicts a perspective view 400 of an embodiment of the MPGI 100 of FIG. 1 when forming an obtuse angle 401 between the first arm 102 and the second arm 103. In the embodiment depicted in FIG. 4, the zero position 115 of the ruler 113 is adjusted, as shown, to be coplanar with the inner surface 116 the second arm 103.
[0052] FIG. 5 depicts a perspective view 500 of another embodiment of the MPGI 100 of FIG. 1 having a wider ruler 501. Particularly, in one embodiment, a width 502 of the ruler 501 is selected such that sum of a width 503 of the first arm 102, excluding the width 502 of the ruler 501, and width 504 of the second arm is equal to a desired radius 505 of the plug-and-play coupling unit 104. Such a configuration of the MPGI 100 allows for better visibility of the ruler 501 when determining measurements. FIG. 5 depicts the ruler 501 as an independent unit provided on an inner surface 506 of the first arm 102, the ruler 501 being disposed in a direction perpendicular to the inner surface 506. However, in an alternative embodiment, the ruler 501 may be disposed in parallel along the plane of the inner surface 506, for example, as shown in FIG. 6. In certain further embodiments, the ruler 501 may be provided as a marking on the inner surface 506. Additionally, the ruler 501 may be provided on more than one surface of the first arm 102 and/or the second arm 103 for convenient measurements.
[0053] Further, FIG. 6 depicts a perspective view 600 of an alternative embodiment of the MPGI 100 of FIG. 1 having a ruler 601 disposed on an inner surface 602 of the first arm 102. The embodiment of the ruler 601 depicted in FIG. 8 allows the first arm 102 and the second arm 103 to form a corner point 603 at any pivotal rotation without needing to slide the ruler 601 to form the corner point. The corner point 603, thus formed, provides accurate zero reference for measurements. In one embodiment, the ruler 601 is marked directly on at least the inner surface 602 of the first arm 102. Alternatively, the ruler 601 is adjustably coupled to the inner surface 602 of the first arm 102 as a separate device. Additionally, in certain further embodiments, the ruler 601 may be provided, as markings or as a separate device, on more than one surface of the first arm 102 and/or the second arm 103 for ease of measurements in different orientations of the MPGI 100 relative to the user. Certain exemplary orientations of the MPGI 100 are shown in FIGs. 7-8.
[0054] Particularly, FIG. 7 depicts a perspective view 700 of an embodiment of the MPGI 100 of FIG. 5 when forming an acute angle 701 between the first arm 102 and the second arm 103. In the embodiment depicted in FIG. 7, the zero position 115 (see FIG. 1) of the ruler 501 is adjusted to be coplanar with the inner surface 116 the second arm 103.
[0055] Further, FIG. 8 depicts a perspective view 800 of an embodiment of the MPGI 100 of FIG. 5 when forming an acute angle 801 between the first arm 102 and the second arm 103. In the embodiment depicted in FIG. 8, the zero position 115 (see FIG. 1) of the ruler 113 is adjusted to be coplanar with the inner surface 116 the second arm 103. As previously noted, adjusting the zero position 115 to be coplanar with the inner surface 116 the second arm 103 allows for accurate measurements. Certain examples of the adjustment means that may be used in the MPGI 100 for adjusting the ruler position for accurate measurements are depicted in FIGs.9-11.
[0056] Particularly, FIG. 9 depicts a perspective view 900 of an exemplary adjusting means 901, similar to the adjustment means 114 of FIG. 1, for adjusting a position of the ruler 113. In the embodiment depicted in FIG. 9, the adjustment means 901 corresponds to a rack and pinion mechanism. FIG. 9A depicts a magnified view 902 of the adjustment means 901 of FIG. 9. As depicted, the adjustment means 901 corresponds to rack and pinion mechanism 903 that may be actuated externally by a user through use of a revolute actuator 904.
[0057] FIG. 10 depicts a perspective view 1000 of an alternative embodiment of an adjusting means 1001 similar to the adjusting means 114 of FIG. 1. In the embodiment depicted in FIG. 10, the adjustment means 1001 corresponds to a push to slide mechanism. FIG. 10A depicts a magnified view 1002 of the adjustment means 1001 of FIG. 10 for adjusting a reference position of the ruler 113 of FIG. 1. As depicted, the adjustment means 1001 corresponds to a push to slide mechanism similar to a working principle of a paper knife sliding mechanism.
[0058] FIG. 11 depicts a perspective view 100 of yet another embodiment of the adjustment means 1001 of FIG. 10 implemented as the push to slide mechanism 1101 for the embodiment of the ruler 113 depicted in FIG. 6. Specifically, FIG. 11A depicts a magnified view 1102 of the push to slide mechanism 1101 used to adjust a position of the ruler 601 disposed in parallel along the inner surface 602 of the first arm 102 to allow for accurate measurements. In certain embodiments, the plug-and-play coupling unit 104 simplifies the measurement operations by allowing use of the ruler 601 and the writing instrument 109 (see FIG. 1) as independent devices. An exemplary use of the ruler 601 and the writing instrument 109 as independent devices via disassembly of the plug-and-play coupling unit 104 is shown in FIG. 12.
[0059] Further, FIG. 13 depicts a magnified view 1300 of an embodiment of the plug-and-play coupling unit 104 of FIG. 1 in a disassembled or unlocked state. In certain embodiments, the plug-and-play coupling unit 104 includes locking-unlocking unit 1301 adapted to connect the first arm 102 to the second arm 103. Additionally, the plug-and-play coupling unit 104 includes a sensor-engaging unit 1302 that, for example, pivotably engages the second arm 103 with the rotary actuator 122 of the sensor 121 of FIG. 1.
[0060] In one embodiment, the locking-unlocking unit 1301 restricts a relative translational motion of the first arm 102 with respect to the second arm 103 in the locked-state, for example, shown in FIG. 1A. However in the unlocked-state, as shown in FIGs 13, the second arm 103 is detached from the pivotal connection to the first arm 102, thus allowing for use of the ruler 113 and the writing instrument 109 as independent devices, as shown in FIG. 12.
[0061] Furthermore, in certain embodiments, the sensor-engaging unit 1302 restricts a relative angular rotation between the rotary actuator 122 and the second arm 103. Thus, when rotating the second arm 103 with respect to the first arm 102, the rotary actuator 122 rotates with respect to the body 123 of the sensor 121 to measure corresponding linear proportional output value. The locking-unlocking unit 1301 and the sensor-engaging unit 1302, together, allow for plug-and-play operation of the first arm 102 and the second arm 103 as multiple geometric instruments, for example, the ruler 113, the writing instrument 109, a compass, a protractor, a divider, and/or other measuring instruments.
[0062] FIG. 14 depicts an exemplary sectional view 1400 of the plug-and-play coupling unit 104 of FIG. 13. In the embodiment shown in FIG. 14, the locking-unlocking unit 1301 corresponds to an axially stamped locking-unlocking subsystem 1401. The axially stamped locking-unlocking subsystem 1401 includes a hollow cylindrical extension 1402 that extends from the first end 106 of the second arm 103 towards the first arm 102. Additionally, the axially-stamped locking-unlocking subsystem 1401 includes one or more key structures 1403 extending from the first end 105 of the first arm 102 towards the second arm 103 (see FIG. 1). In one embodiment, the cylindrical extension 1402 includes an annular groove 1104 along a corresponding inner lateral surface 1405. Further, each of the key structures 1403 includes a radially protruding structure 1406 disposed at an outer lateral surface 1407 of the key structures 1403.
[0063] In certain embodiments, the radially protruding structures 1406 are adapted to engage with the annular groove 1404 of the cylindrical extension 1402 to achieve a locked state of the locking-unlocking subsystem 1401. Furthermore, the radially protruding structures 1406 are also adapted to disengage from the annular groove 1404 to achieve an unlocked state of the locking-unlocking subsystem 1401. The locking-unlocking subsystem 1401, shown in FIG. 14, restricts relative translational movement between the first arm 102 and the second arm 103, but allows rotational movement along a particular pivotal axis 1408.
[0064] FIG. 14 also depicts the sectional view 1400 of the sensor-engaging unit 1302 of FIG. 13. In the embodiment shown in FIG. 14, of the sensor engaging unit 1302 corresponds to a solid engaging structure 1409 that extends from the first end 106 of the second arm 103 towards the first end 105 of the first arm 102. In certain embodiments, a shape and volume of the solid engaging structure 1409 is selected so as to allow for an effective connection with the rotary actuator 122 of the sensor 121. Particularly, the shape and volume of the solid engaging structure 1409 is selected so as to restrict relative angular rotation between the rotary actuator 122 and the second arm 103. More specifically, the shape and volume of the solid engaging structure 1409 is selected such that a rotation of the second arm 103 rotates the rotary actuator 122 by a proportional amount, which is measured by the processing circuitry 124. Although, FIG. 14 depicts an axially stamped locking-unlocking subsystem 1401, in other embodiments, the plug-and-play coupling unit 104 may include other types of coupling mechanisms. Certain examples of such alternative coupling mechanisms are depicted in FIGs. 15 and 16.
[0065] Specifically, FIGs. 15 and 15A depicts perspective views 1500 and 1501 of an alternative embodiment of the plug-and-play coupling unit 104 of FIG. 13. In the embodiment shown in FIG. 15A, the locking-unlocking unit 1301 of FIG. 13 corresponds to a radially stamped locking-unlocking subsystem 1502.
[0066] Further, FIG. 16 depicts a magnified view 1600 of yet another embodiment of the plug-and-play coupling unit 104 of FIG. 13. In the embodiment shown in FIG. 16, the locking-unlocking unit 1301 of FIG. 13 may correspond to a male-female type locking-unlocking subsystem 1601. Particularly, the male-female type locking-unlocking subsystem 1601 includes one or more male structures 1602 disposed on the second arm 103 and one or more female structures 1603 disposed on the first arm 102 and adapted to couple with the male structures 1602.
[0067] In certain other embodiments, however, the locking-unlocking unit 1301 of FIG. 13 may correspond to a magnetic coupling mechanism. The magnetic coupling mechanism may be implemented, for example, by disposing one or more magnets in male structures 1602 that are capable of engaging with the female structures 1603 that may be made of magnetic materials. Although, FIGs. 14-16 depict only a few coupling mechanisms, it may be appreciated that the plug-and-play coupling unit 104 may be implemented using any suitable coupling mechanism that allows for connection and disconnection of the first arm 102 and the second arm 103 for desired measurements.
[0068] Further, FIG. 17 depicts perspective view 1700 of the writing instrument 109 of FIG. 1 that may be used to record measurements. Particularly, FIG. 17 depicts an example of the second end 110 of the second arm 103 including the writing core feeding mechanism 112. In the embodiment depicted in FIG. 17, an open slot 1701 is provided on an outer surface 1702 corresponding to the second end 110 of the second arm 103 to operate the writing core feeding mechanism 112.
[0069] FIG. 18 depicts an exemplary unexploded view 1800 of the writing core feeding mechanism 112 of FIG. 1. Further, FIG. 19 depicts an exemplary exploded view 1900 of the writing core feeding mechanism 112 of FIG. 1. In one embodiment, the writing core feeding mechanism 112 includes a body 1901 having an axially extended bore 1902. In certain embodiments, a shape of the bore 1902 is adapted to receive a desired writing core 111 and a jaws member 1903. The jaws member 1903 includes a plurality of jaws 1904 capable of clamping around the writing core 111.
[0070] In one embodiment, a portion of the jaws member 1903 disposed inside the axially extended bore 1902 is accessible from outside the body 1901 via an axially and radially extending slot 1905 in the body 1901. In certain embodiments, the jaws member 1903 further includes a locking groove 1906 for engaging with a sliding device 1907 disposed in the slot 1905. The sliding device 1907 includes a first structural portion 1908 that extends radially inwards into the axially extended bore 1902 to engage with the locking groove 1906 of the jaws member 1903. Additionally, the sliding device 1907 includes a second structural portion 1909 that extends radially outwards from the body 1901 through an outer opening 1910 of the slot 1905 and the open slot 1701 (see FIG. 17) in the second arm 103.
[0071] The writing instrument 109 further includes a retention means 1911, for example a spring, adapted to engage the sliding device 1907 and the jaws member 1903 so as to allow the jaws member 1903 to slide out axially only on actuation of the sliding device 1907. In a default position, the spring 1911 holds the sliding device 1907 and the jaws member 1903 axially backwards into the axially extended bore 1902. However, when a user pushes the sliding device 1907 forward, the spring 1911 is compressed, thereby allowing the plurality of jaws 1904 to open to receive a writing core 111 inside the axially extended bore 1902. The writing instrument 109, thus, is made ready for use.
[0072] FIG. 20 depicts a perspective sectional view 2000 of the writing instrument 109 of FIG. 1. Further, FIG. 21 depicts an exemplary sectional view 2100 of the writing instrument 109 of FIG. 1 with the plurality of jaws 1904 (see FIG. 19) in a closed configuration. Additionally, FIG. 22 depicts an exemplary sectional view 2200 of the writing instrument 109 of FIG. 1 with the plurality of jaws 1904 (see FIG. 19) in an open configuration. FIGs. 17-22 depict certain embodiments of the writing instrument 109 having a jaws member 1903 (see FIG. 19). However, in one embodiment, the writing instrument 109 may correspond to a conventional pencil, pen, or other suitable writing instrument disposed within a hollow cavity of the first arm 102 and/or the second arm 103. Alternatively, the writing instrument 109 may be coupled separately to the first arm 102 and/or the second arm 103 of the MPGI 100 via mechanical, magnetic, electrostatic, or other suitable coupling means for recording desired measurements.
[0073] Further, FIG. 23 depicts an exemplary graphical representation 2300 of the UI 117 of FIG. 1 that allows the user to select desired measurement operations and view corresponding results. To that end, the UI 117 includes the selection means 118, indicators 119, and the display device 120. In certain embodiments, the selection means 118 include one or more switches, such as, electromechanical switches, touch-based switches and/or other suitable switching subsystems. Particularly, in one embodiment, the selection means 118 include a mode selector switch 2301, a relative mode switch 2302, and an On/Off/Wakeup switch 2303. These switches may be used to select various states of operation of the MPGI 100, activating, deactivating, and/or operating the MPGI 100 in a low power mode, selecting a desired measurement operation, and/or setting output parameters such as measurement units and indicator preferences.
[0074] Further, in one embodiment, the UI 117 also includes the indicators 119 that indicate a selected mode of operation and/or an output of various measurement operations. In the embodiment shown in FIG. 23, the indicators 119 include light emitting diodes (LED) 2304, 2305, and 2306 that may be activated, deactivated, and/or exhibit change in color and/or intensity to indicate the selected mode of operation and/or any other output. In one embodiment, for example, the LED 2304 may be configured to indicate selection state of an angular measurement mode, whereas the LED 2305 and LED 2306 indicate a length measurement mode and a relative mode, respectively. Although, FIG. 23 depicts only the LEDs 2304, 2305, and 2306, in other embodiments, the indicators 119 may, additionally or alternatively, include an audio indicator such as a micro piezo buzzer, and/or a tactile indicator.
[0075] In one embodiment, the UI 117 further includes the display device 120 configured to communicate the output of various selection and/or measurement operations. Particularly, the display device 120 may be configured to display the change in angle or length while the first arm 102 is being moved relative to the second arm 103 (see FIG. 1). However, in an alternative embodiment, the display device 120 may be configured to display only the final measurement. The final measurement, for example, may be determined via use of the selection means 118 and/or by detecting inactivity for more than specified period of time via use of a timer (not shown).
[0076] In certain embodiments, the display device 120 also incorporates the functions of the selection means 118 and/or the indicators 119 by providing touch-based selection and custom indication options. Accordingly, the display device 120, for example, may include a liquid crystal display (LCD), organic light emitting diode (OLED) display, E-ink display, thin film transistor (TFT) display, and/or any other suitable display, preferably operable with low power. As previously noted, the display device 120 may be operatively coupled to the processing circuitry 124 (see FIG. 1) to communicate the user selections and/or to receive measurement data for output.
[0077] FIG. 24 depicts an exemplary schematic view 2400 of the processing circuitry 124 of FIG. 1 configured to provide output information corresponding to the measurement operation performed by a user. In one embodiment, the processing circuitry 124 includes a microcontroller 2401, a crystal oscillator 2402, and other suitable active and/or passive electronic components. These electronic components are operatively connected with the UI 117, the selection means 118, the indicators 119, the display device 120, and/or the sensor 121 to receive user selection information and output corresponding operational and/or measurement information. In certain embodiments, the microcontroller 2401 further includes one or more analog and digital general-purpose input/output (GPIO) pins, power pins, other interfacing pins, and/or stored communication protocols, for digital and analog interfacing.
[0078] Particularly, in one embodiment, the microcontroller 2401 includes an analog GPIO pin 2403 that provides output of the sensor 121 as input to the microcontroller 2401. The GPIO pin 2403 allows the microcontroller 2401 to read a sensor measurement corresponding to a pivotal rotation of the first arm102 relative to the second arm 103. The microcontroller 2401 then processes the sensor measurement based on the selected operation mode and communicates the output measurement to the display device 120 for display. Specifically, the microcontroller 2401 converts the sensor measurement into an equivalent distance or angle measurement, for example, using suitable conversion instructions specified for the selected model of operation. Furthermore, the microcontroller 2401 may be interfaced with the display device 120 via GPIO pins 2404 through one or more communication protocols. These protocols, for example, include Inter-Integrated Circuit (I²C), Serial peripheral interface (SPI), or Universal asynchronous receiver transmitter (UART) protocols for receiving inputs and/or communicating outputs to the display device 120.
[0079] Similarly, in certain embodiments, the selection means 118 including the switches 2301, 2302, and 2303 (see FIG. 23), may be interfaced with the microcontroller 2401 via the GPIO pin 2404 or interrupt pins 2405 to switch between different states of operation. Connecting the switches 2301, 2302, and 2303 with the microcontroller 2401 via the interrupt pins 2405 allows for faster change of state during a switch press operation. In one embodiment, the microcontroller 2401 identifies a selection state of the switches 2301, 2302, and 2303 by detecting a change in corresponding logical levels, namely, ‘0’ and ‘1.’ In an exemplary scenario, a digital high ‘1’ is supplied across the interrupt pins 2405 during a ‘switch-off’ state of the switches 2301, 2302, and 2303 via a pull-up resistor 2406. Alternatively, during a ‘switch-on’ operation, a connection to the ground is set to a logical ‘0’ across the interrupt pins 4505. The microcontroller 2401 determines the logical level associated with each of the switches 2301, 2302, and 2303 to identify the user-activated switch, and thereby the selected mode of operation. The microcontroller 2401 then transitions the MPGI 100 (see FIG. 1) to the selected mode of operation.
[0080] According to certain aspects of the present description, each of the indicators 119 including the LEDs 2304, 2305, and 2306 (see FIG. 23), is also interfaced to the microcontroller 2401 to the digital GPIO pins 2404 of the microcontroller 2401 via a series resistor 2407 as output peripheral. The LEDs 2304, 2305, and 2306 may then be switched on/off based on the selected state of operation.
[0081] Additionally, in certain embodiments, the microcontroller 2401 is connected to a power supply source 2408 via a regulator circuit 2409. The power supply source 2408, for example, may include rechargeable batteries like Lithium polymer or Lithium-ion batteries, and/or non-rechargeable batteries like dry cell or button cell batteries. The powered microcontroller 2401, thus, serves as the central processing unit of the MPGI 100 (see FIG. 1) by receiving user selection input and communicating resulting measurement as output.
[0082] FIG. 25 depicts a block diagram 2500 depicting certain exemplary inputs 2501 received by the microcontroller 2401 (see FIG. 24), one or more processing steps 2502 performed by the microcontroller 2401, and resulting outputs 2503. An exemplary operational logic that correlates the various inputs 2501 to corresponding outputs 2503 will described in greater detail with reference to FIG. 26.
[0083] FIG. 26 depicts a graphical representation 2600 of an exemplary operation logic that correlates the various inputs 2501 to corresponding outputs 2503 (see FIG. 25). In one embodiment, the operation logic is implemented using a state machine algorithm embedded in the processing circuitry 124 (see FIG. 1) as a device firmware. Particularly, the operation logic aids in execution of various functions of the MPGI 100 by defining relationships between the various inputs 2501 and outputs 2503. The functions, for example, include determining useful parameters during different states-of-operation, switching between the different states-of-operations, and running the processing circuitry 124 in a low power mode.
[0084] By way of example, upon switching on the MPGI 100, the operation logic may transition the MPGI 100 to an active state 6. In one embodiment, the active state 6 further includes multiple operational states, in which the MPGI 100 may operate to execute various geometric operations. These operational states, for example, include State 1 corresponding to an absolute angle mode, State 2 corresponding to absolute length mode, State 3 corresponding to relative angle mode and State 4 corresponding to relative length mode. An absolute angle is the planar angle formed by the second arm 103 with respect to the first arm 102 (see FIG. 1) of the MPGI 100. Upon selection of an appropriate switch, for example the mode selector switch 2301 of FIG. 23, the operation logic transitions the MPGI 100 to the absolute angle mode via a transition phase T01.
[0085] In the transition state T01, the angle mode LED 2304 switches on, and the digital display device 120 is reset. Once the MPGI 100 enters the absolute angle mode, the operation logic configures the processing circuitry 124 to continuously read output of the sensor 121. The processing circuitry 124 further performs specified mathematical operations to convert the detected sensor output to an absolute angle measurement. Subsequently, the processing circuitry communicates the absolute angle measurement to the digital display device 120.
[0086] Further, upon pressing the mode selector switch 2301 again, in certain embodiments, the operation logic causes the MPGI 100 to transition to the absolute length mode via a transition phase T12. The absolute length is a distance between a tip of the first arm 102 and a tip of the writing core 111. During the transition state T12, the length mode LED 2305 switches on, and the digital display device 120 is reset. Once the MPGI 100 enters the absolute length mode, the operation logic configures the processing circuitry 124 to continuously read output of the sensor 121. The processing circuitry 124 further performs specified mathematical operations to convert the detected sensor output to an absolute length measurement. Subsequently, the processing circuitry communicates the absolute length measurement to the digital display device 120.
[0087] Similarly, upon pressing the mode selector switch 2301 once again, the operation logic may cause the MPGI 100 to return to the absolute angle mode via a transition phase T21. In the transition state T21, the angle mode LED 2304 switches on, and the digital display device 120 is reset.
[0088] According to certain aspects of the operation logic, the MPGI 100 also includes a State 3 corresponding to a relative angle mode and a State 4 corresponding to a relative length mode. Measurements in the relative angle and length modes are determined by setting a particular rotary position between the first arm 102 and second arm 103 as zero reference, and measuring a desired angle and length, respectively, relative to the zero reference.
[0089] Specifically, in one embodiment, the user may activate the relative mode measurements via the relative mode switch 2302. Upon pressing the relative mode switch 2302, the operation logic transitions the MPGI from an absolute measurement mode to a relative measurement mode. For example, when the MPGI 100 is in the absolute angle mode, pressing the relative mode switch 2302 transitions the MPGI 100 to the relative angle mode through a transition phase T13. A relative angle is an angle between a last position of the second arm 103 before the MPGI 100 is switched to the relative angle mode and a new position of the second arm 103 acquired after switching the MPGI 100 to the relative angle mode. In the transition state T13, the angle mode LED 2304 remains on, the relative mode LED 2306 switches on, and the digital display device 120 is reset. Upon pressing the relative mode switch 2302 again, the operation logic transitions the MPGI 100 back to the absolute angle mode via a transition phase T31. During the transition phase 31, the angle mode LED 2304 switches on and the display device 120 outputs the absolute angle.
[0090] Alternatively, when the MPGI 100 is in absolute length mode, pressing the relative mode switch 2303 causes the operation logic to transition the MPGI 100 to the relative length mode through a transition state T24. The relative length is a distance between a last position of a tip of the writing core 111 before switching the MPGI 100 to the relative length mode and position of the tip of the writing core 111 subsequent to switching the MPGI 100 to the relative length mode. In the transition state T24, the length mode LED 2305 remains on, the relative mode LED 2306 switches on, and the digital display device 120 is reset.
[0091] Upon pressing the relative mode switch 2306 again, the operation logic returns the MPGI 100 to the absolute length mode via a transition state T42. In the transition state T42, the length mode LED 2305 switches on and the display device 120 displays the absolute length measurement.
[0092] Further, if the MPGI 100 is in the relative angle mode, pressing the mode selector switch 2301 transitions the MPGI 100 to the relative length mode via transition state T34. In the transition state T34, the length mode LED 2305 switches on and the display device 120 outputs the relative length measurement.
[0093] Alternatively, if the MPGI 100 is in the relative length mode, pressing the mode selector switch 2301 returns the MPGI 100 to the relative angle mode via transition state T43. In the transition state T43, the angle mode LED 2304 switches on and the display device 120 displays the relative angle measurement.
[0094] In addition to the active state 6, the MPGI 100 may also transition to a sleep state 5. In certain embodiments, if the MPGI 100 is not in use for a predefined time period, the operation logic transitions the MPGI 100 to the sleep state 5 via a transition state T65. The sleep state 5 corresponds to a low power hibernation state, which conserves power supplied by the power supply source, 2408 (see FIG. 24). In the transition state T65, one or more power-consuming units of the processing circuitry 124 may switch off, and/or may enter into a low-power hibernation state.
[0095] The MPGI 100 may be transitioned back to a default state or the last known active state by pressing the On/Off/Wakeup switch 2303 via transition state T56. In the transition state T56, all LEDs retain their states designated for the current active state, an all the components of the processing circuitry 124 are powered on for further measurement operations.
[0096] Embodiments described herein present a MPGI that combines functionality of a plurality of geometric instruments such as a compass, protractor, divider, setsquares, ruler, and writing instrument into a single portable device. Particularly, the MPGI employs a plug-and-play coupling mechanism to allow for convenient measurements. Additionally, use of digital measurement means and efficient MPGI design mitigates human, systematic random, and/or zero referencing errors typically encountered in conventional multipurpose geometric instruments. Particularly, unlike other conventional instruments, the present MPGI provides desired measurement functionality, where both measurement and drawing movements are required. Embodiments of the present MPGI, thus, combines functionalities of multiple geometric instruments in a single portable device that provides ease of user interaction and accurate measurements.
[0097] It may be noted that the foregoing examples, demonstrations, and process steps that may be performed by certain components of the present systems, for example, by the processing circuitry 124 (see FIG. 1) and the microcontroller 2401 (see FIG. 24) may be implemented using hardware, firmware, and/or suitable code on a processor-based system, such as a general-purpose or a special-purpose computer. It may also be noted that different implementations of the present specification may perform some or all of the steps described herein in different orders or substantially concurrently.
[0098] Additionally, various functions and/or method steps described in may be implemented in a variety of programming languages, including but not limited to Ruby, Hypertext Pre-processor (PHP), Perl, Delphi, Python, C, C++, or Java. Such code may be stored or adapted for storage on one or more tangible, machine-readable media, such as on data repository chips, local or remote hard disks, optical disks (that is, compact disks or digital versatile disks), solid-state drives, or other media, which may be accessed by the processor-based system to execute the stored code.
[0099] Although specific features of various embodiments of the present systems and methods may be shown in and/or described with respect to some drawings and not in others, this is for convenience only. It is to be understood that the described features, structures, and/or characteristics, and any subset thereof, may be combined and/or used interchangeably in any suitable manner in the various embodiments, for example, to construct additional assemblies and techniques for use in various measurement and/or design systems.
[0100] While only certain features of the present systems and methods have been illustrated and described herein, many modifications and changes will occur to those skilled in the art. It is, therefore, to be understood that the appended claims are intended to cover all such modifications and changes as fall within the true spirit of the invention.