The present invention generally relates to banjo bolts. More particularly, the present invention relates to torqueing of banjo bolts.
DEFINITION
As used in the present disclosure, the following terms are generally intended to have the meaning as set forth below, except to the extent that the context in which they are used indicates otherwise.
The expression "torqueing" used hereinafter in this specification refers to, but is not limited to a precise application of a specific torque, using a tool such as a torque wrench, to a fastener such as a nut or bolt.
These definitions are in addition to those expressed in the art.
BACKGROUND
Banjo bolts are perforated hollow bolts typically used with fluid systems for facilitating the flow of fluid through fluid delivery lines and other components. The hollow interior of a banjo bolt allows fluid to flow inside, and exit through a small hole created at a side of the bolt. Banjo bolt fittings are commonly used in vehicle fuel, oil, hydraulic systems, and the like, for connecting components such as brake-fluid lines to brake cylinders for facilitating flow of brake-fluid to brake cylinders, hose pipes to steering cylinders for facilitating flow of oil to the steering cylinder, and the like.
Generally, the use of banjo bolt fittings to connect vehicle components, involves torqueing of the bolts in the components. However, some of the problems observed in using banjo bolt fittings for connecting vehicle components include insufficient torqueing or in certain situations completely missed torqueing that results in leakage of fluid from the banjo fittings. Torqueing miss happens when banjo bolt is not torqued at all, which causes leakage of fluid. Possible reasons for torqueing miss or insufficient torqueing may be negligence of the operator arising

out of fatigue and such other reasons. This may result in malfunctioning of the components, which may lead to an accident, thus jeopardizing vehicle occupant safety.
To overcome the aforementioned technical problems and disadvantages associated with torqueing of banjo bolts, there is felt need for a system for ensuring mistake-proof torqueing of banjo bolts and providing leakage-proof banjo fittings in vehicles.
OBJECTS
Some of the objects of the present disclosure aimed to ameliorate one or more problems of the prior art or to at least provide a useful alternative are listed herein below:
It is an object of the present disclosure is to provide a system to ensure mistake-proof torqueing of a banjo bolt.
Another object of the present disclosure is to provide a system for torqueing of banjo bolts that ensures zero leakage of fluid from vehicle components connected by banjo bolts.
Yet another object of the present disclosure is to provide a system that facilitates torqueing operation without continuous human intervention required for keeping check on completion of torqueing.
Yet another object of the present disclosure is to provide a simple and customer oriented system for torqueing of banjo bolts having low cost maintenance.
Other objects and advantages of the present invention will be more apparent from the following description when read in conjunction with the accompanying figures, which are not intended to limit the scope of the present invention.
SUMMARY

In accordance with one aspect of the present disclosure, a system for torqueing at least one banjo bolt of steering cylinder is disclosed. The system includes a fixture, a first switch, a torque wrench, a second switch and sensing and timing means.
The first switch is mounted on the fixture. The first switch is configured to be activated by the presence of the steering cylinder supported on the fixture and generate a first signal indicating the presence of a steering cylinder. In an embodiment, the first switch is a limit switch. In another embodiment, the limit switch is an electro-mechanical switch mounted on an operative top surface of the fixture. In yet another embodiment, the electro-mechanical switch is activated by placement of the steering cylinder on the fixture.
The second switch is mounted on the torque wrench. Further, the second switch is configured to sense completion of the torqueing of a bolt in the steering cylinder by the torque wrench and generate a second signal upon sensing the completion of torqueing. In an embodiment, the second switch is a micro-switch. In another embodiment, the micro-switch is also an electromechanical switch which is a displacement type (plunger type) switch for sensing completion of the torqueing by the torque wrench.
The sensing and timing means is configured to sense the first and second signals and the time elapsed there-between to identify the presence of the steering cylinder in the fixture, completion of torqueing within a pre-determined time interval and the number of cylinders on which torqueing has been accomplished within a pre-determined time period.
In an embodiment, the sensing and timing means comprises a transmitter, a receiver, a timer and a counter. The transmitter is mounted on the torque wrench. Further, the transmitter is communicably coupled to the second switch. The transmitter is configured to be activated by the second signal, and is further configured to transmit a wireless signal upon being activated. The receiver is configured to wirelessly communicate with the transmitter to receive the wireless

signal corresponding to the second signal. The timer is communicably coupled to the receiver and the first switch to receive the second and first signals respectively. Further, the timer is configured to count time elapsed since receiving the first signal and further configured to generate an alarm in the event that the second signal is not received within a pre-determined time interval elapsed since receiving of the first signal. The counter is communicably coupled to the receiver to receive the second signal. The counter is further configured to count each reception of the second signal to count the number of steering cylinders having the bolt torqued therein.
In another embodiment, the pre-determined time interval is three and half minutes.
In yet another embodiment, the sensing and timing means employs a Relay Logical Circuit (RLC).
In another embodiment, the fixture includes a semi-circular element positioned on the fixture for supporting the steering cylinder thereon.
BRIEF DESCRIPTION OF ACCOMPANYING DRAWING
The system will now be elaborated with the help of the accompanying drawing, in which:
Figure 1 illustrates a schematic diagram of a system for torqueing of a bolt in a steering cylinder in accordance with the present disclosure; and
Figure 2 is a schematic diagram of the steering cylinder mounted on a fixture as illustrated in Figure 1.
LIST OF REFERENCE NUMERALS
100-System
102 -Fixture

102a - semi-circular element
102b - dual-plated element
104 -First Switch
106 - Torque Wrench
108 - Second Switch
110 - Transmitter
160 - Sensing and Timing means
202 - Receiver
204 -Timer
206 -Counter
208 - indicator
DETAILED DESCRIPTION
Banjo bolts are used in vehicle fuel, oil, hydraulic systems, and the like, for connecting components for passing fluids to the components. One such vehicle where steering cylinder assembly used is a tractor. In tractors, a steering cylinder assembly arrangement is used to achieve left and right directional movement of tractors. This whole arrangement is operated using oil pressure. The assembly consists of steering cylinder and delivery pipes connected through banjo bolts. However, in case the banjo bolts are not torqued sufficiently, leakage of fluid is observed from banjo bolts which can cause steering failure, and may result in accident. To overcome the problem, a system for torqueing a bolt is developed which ensures mistake-proof torqueing.

The system will now be described with the help of accompanying drawing, wherein Figure 1 illustrates a schematic diagram of a system for torqueing of a bolt in a steering cylinder in accordance with the present disclosure and Figure 2 is a schematic diagram of the steering cylinder mounted on a fixture as illustrated in Figure 1.
Referring to Figure 1, a system (100) for torqueing of bolt in a steering cylinder is disclosed. The system (100) comprises a fixture (102), a first switch (104) placed in proximity of the fixture (102), a second switch (108) mounted on a torque wrench (106) and sensing and timing means (160). The sensing and timing means (160) comprises a transmitter (110), a receiver (202), a timer (204) and a counter (206). The transmitter (110) is mounted on the torque wrench (106). The receiver (202) wirelessly communicates with the transmitter (110). The timer (204) is communicably coupled to the first switch (104) and the receiver (202), and the counter (206) is communicably coupled to the receiver (202). In an embodiment, the receiver (202), the timer (204) and the counter (206) are included in a control panel.
The fixture (102) includes a semi-circular element (102a) and a dual-plated element (102b) both mounted on a worktable. The distance between the semi-circular element (102a) and the dual-plated element (102b) is chosen to correspond to the length of the steering cylinder. Accordingly, the distance between the semi-circular element (102a) and dual-plated element (102b) varies with the length of the steering cylinder. The semi-circular element (102a) is a single C-shaped metallic disc adapted to accommodate a front end portion of the steering cylinder therein. The dual-plated element (102b) comprises two parallel plates placed adjacent to each other with a gap there-between equivalent to the thickness of a rear end portion of the steering cylinder, whereby the rear end portion of the steering cylinder is firmly held between the plates.
The first switch (104), placed in the proximity of the fixture (102), is configured to be activated by the presence of the steering cylinder supported on the fixture (102). The first switch (104) is further configured to generate a first signal on

sensing the presence of the steering cylinder. The first switch (104) is connected to the control panel. Typically, the first switch (104) is mounted on an operative top surface of the worktable in proximity to fixture (102). In an embodiment, the first switch (104) is mounted by providing an 8 mm hole in the worktable through which only plunger part of the first switch (104) comes out and a base part of the first switch (104) is fastened with chuck nuts clamping the first switch (104) on the worktable so that only plunger part comes in contact with the steering cylinder. In accordance with one embodiment, the first switch (104) is a limit switch such as an electromechanical switch, which is activated by placement of the steering cylinder on a plunger of the limit switch, whereupon the limit switch generates and transmits the first signal.
The second switch (108), mounted on a torque wrench (106) along with the transmitter (110) is a micro-switch. In accordance with one embodiment, the second switch (108) is an electromechanical displacement type (plunger type) switch. The second switch (108) is configured to sense the completion of torqueing of banjo bolt by the torque wrench (106) and generate a second signal upon sensing the completion of torqueing of banjo bolts. In accordance with one embodiment, the second switch (108) is a micro-switch which is a displacement based switch configured to sense completion of torqueing of banjo bolt. When torque is achieved the torque wrench gives a displacement at the joint which presses the micro-switch plunger, hence providing input to the transmitter (110) and generates a second signal upon sensing the completion of torqueing of banjo bolts.
The transmitter (110) is communicably coupled with the second switch (108), and wirelessly transmits the second signal to the control panel.
The receiver (202) in the control panel is configured to receive the second signal transmitted by the transmitter (110) mounted on the torque wrench (106). The receiver (202) is communicably coupled to the timer (204), the counter (206) and an indicator (208).

The timer (204) is also communicably coupled with the first switch (104). On receiving the first signal from the first switch (104), the timer (204) starts counting the time elapsed since the receiving of the first signal. In the embodiment where the limit switch is an electro-mechanical switch, the timer (204) counts the time elapsed since the placement of the steering cylinder on the plunger of the first switch (104). The timer (204) continues to count time till the timer (204) receives the second signal from the second switch (108) via the receiver (202).
The timer (204) is reset upon receiving the second signal from the transmitter (110) which indicates completion of torqueing of the banjo bolt in steering cylinder. The timer (204) is coupled to the indicator (208). The indicator (208) includes a green light which glows indicating the completion of torqueing of banjo bolt and the counter (206) is incremented indicating the number of steering cylinders having completely torqued banjo bolts in the predetermined time period.
In an embodiment, the system also includes a click counter (not shown in figures) cooperating with receiver (202) which is configured to count number of second signals received in the predetermined time interval.
In case when the second signal is not received from the transmitter (110) the timer (204) continues counting till pre-determined time interval and a red light of the indicator (208) glows indicating non-completion of the torqueing of banjo bolts.
In accordance with one embodiment, the pre-determined time interval is three and a half minutes. The alarm is activated by the timer (204) in case the receiver (202) does not receive the second signal before completion of the pre-determined time interval, indicating no bolt is torqued in pre-determined time interval.
In an embodiment, each of the steering cylinder has at least two banjo bolts. The timer (204) is configured to count time till the timer (204) receives two second signals.

Experimental data of the torqueing of banjo bolt without using the system as disclosed in the present disclosure and the torqueing performed by the system as disclosed in the present disclosure is shown below.
Table 1 below shows the torqued amount, fluid leakage and no. of cylinders 5 torqued without using the system described in the present disclosure.
Table 2 below shows the number of steering cylinders torqued using the system 10 described in the present disclosure without observing any fluid leakage after the implementation of the system. The actual torque required is 22-25 lbft which is achieved by using the system described in the present disclosure.

Table 3 below shows the number of cases of failure in terms of leakage in steering cylinder banjo bolts reported for four months before and five months after the implementation of the system claimed in the present disclosure. It can be observed that no failure of the steering cylinder in the field was reported consistently for five months after the system as disclosed in the present disclosure was implemented.
Thus the system for torqueing of a banjo bolt as described in the present ensures 10 mistake-proof torqueing of the banjo bolt, with reduced cost and simple design, and also ensures reduction in leakage of fluid from the banjo fitting to zero. The wireless communication established for counting the number of steering cylinders and indicating a torque miss by an alarm eliminates the risk of torqueing miss. The system described herein, operates on very low cost with high productivity and 15 less human intervention.
TECHNICAL ADVANCEMENTS AND ECONOMICAL SIGNIFICANCE
The technical advancements offered by the system of the present disclosure which 20 add to the economic significance of the disclosure include the realization of a system that:
• ensures mistake-proof torqueing of a banj o bolt;
11

• ensures zero leakage of fluid from vehicle components connected by banjo bolts;
• facilitates torqueing operation without continuous human intervention required for keeping check on completion of torqueing; and
5 • is simple in construction.
Throughout this specification the word "comprise", or variations such as "comprises" or "comprising", will be understood to imply the inclusion of a stated element, integer or step, or group of elements, integers or steps, but not the
10 exclusion of any other element, integer or step, or group of elements, integers or steps.
The use of the expression "at least" or "at least one" suggests the use of one or more elements or ingredients or quantities, as the use may be in the embodiment of the invention to achieve one or more of the desired objects or results.
15 The numerical values mentioned for the various physical parameters, dimensions or quantities are only approximations and it is envisaged that the values higher/lower than the numerical values assigned to the parameters, dimensions or quantities fall within the scope of the invention, unless there is a statement in the specification specific to the contrary.
20 The foregoing description of the specific embodiments will so fully reveal the general nature of the embodiments herein that others can, by applying current knowledge, readily modify and/or adapt for various applications such specific embodiments without departing from the generic concept, and, therefore, such adaptations and modifications should and are intended to be comprehended within
25 the meaning and range of equivalents of the disclosed embodiments. It is to be understood that the phraseology or terminology employed herein is for the purpose of description and not of limitation. Therefore, while the embodiments herein have been described in terms of preferred embodiments, those skilled in the art will recognize that the embodiments herein can be practiced with modification
within the spirit and scope of the embodiments as described herein.

WE CLAIM

1)A system (100) for torqueing at least one bolt of a steering cylinder, said
system (100) comprising:
• a fixture (102);
• a first switch (104) mounted on the fixture (102), said first switch (104) configured to be activated by the presence of the steering cylinder supported on said fixture (102) and generate a first signal indicating the presence of a steering cylinder;
• a torque wrench (106);
• a second switch (108) mounted on said torque wrench (106), said second switch (108) configured to sense completion of the torqueing of a bolt in said steering cylinder by said torque wrench (106) and generate a second signal upon sensing the completion of torqueing; and
• sensing and timing means (160) configured to sense the first and second signals and the time elapsed there-between to identify the presence of the steering cylinder in the fixture (102), completion of torqueing within a pre-determined time interval and the number of cylinders on which torqueing has been accomplished within a pre-determined time period.
2)The system (100) as claimed in claim 1, wherein said sensing and timing
means (160) comprises:
• a transmitter (110) mounted on said torque wrench (106), said transmitter (110) communicably coupled to said second switch (108), said transmitter (110) configured to be activated by said second signal, and further configured to transmit a wireless signal upon being activated;
• a receiver (202) configured to wirelessly communicate with said transmitter (110) to receive said wireless signal corresponding to said second signal;

• a timer (204) communicably coupled to said receiver (202) and said first switch (104) to receive said second and first signals respectively, said timer (204) configured to count time elapsed since receiving said first signal and further configured to generate an alarm in the event that said second signal is not received within the pre-determined time interval elapsed since receiving of said first signal; and
• a counter (206) communicably coupled to said receiver (202) to receive said second signal and configured to count each reception of said second signal to count the number of steering cylinders having said bolt torqued therein.

3)The system (100) for torqueing as claimed in claim 1, wherein said first switch (104) is a limit switch and said second switch (108) is a micro-switch.
4)The system (100) for torqueing as claimed in claim 2, wherein said limit switch (104) is an electro-mechanical switch mounted on an operative top surface of said fixture (102).
5)The system (100) for torqueing as claimed in claim 3, wherein said electro-mechanical switch (104) is activated by placement of said steering cylinder on said fixture (102).
6)The system (100) for torqueing as claimed in claim 1, wherein said fixture (102) includes a semi-circular element (102a) positioned on said fixture (102) for supporting said steering cylinder thereon.
7) The system (100) for torqueing as claimed in claim 2, wherein said micro-switch (108) is an electromechanical displacement type (plunger type) switch for sensing completion of the torqueing by said torque wrench (106).

8) The system (100) for torqueing as claimed in claim 1, wherein said pre-determined time interval is three and half minutes.