Claims:We claim:
1. A device for caulking of fillers in computer numeric control (CNC) milled slot recess (32) of dynamoelectric machine rotor conductors, the device comprising:
a first position tool (37) provided with a plurality of holes (41) on a abut surface (40) for insertion of a plurality of spring pins (38) and for supporting a pre-tensioned spring arrangement (43) to counter any tolerance in size of fillers (30) during its manufacturing;
a second position tool (37’) provided with a plurality of arms (42);
a space (35) and a chamfer (36) provided on said first and second position tools (37, 37’) to uprightly held the first and second position tools (37, 37’) in gas flow channels (29, 29’), wherein the chamfer (36) is formed to neatly and accurately insert in the space (35) without any damage to rotor coil (24), and wherein a plurality of spaces (35), equaling the number of coil turns (24) and their sharp edges, are rounded off so as to avoid any damage to the CNC milled slot recess (32); and
a packing rod (39) shrink fitted between the first and second position tools (37, 37’) and the CNC slot recess (32) to remove any looseness in the device.
2. The device as claimed in claim 1, wherein the size of the plurality of spring pins (38) and the plurality of arms (42) are to be selected as per a ventilation diagram.
3. The device as claimed in claim 1, wherein the space (35) and the chamfer (36) matches a conductor profile (25’).
4. The device as claimed in claim 1, wherein the plurality of spaces (35) equals the number of coil turns (24) in a rotor winding (20).
5. The device as claimed in claim 1, wherein all sharp edges of the first and second position tool (37, 37’) are rounded off so as to avoid any damage to the CNC milled slot recess (32).
6. The device as claimed in claim 1, wherein on the first position tool (37), a pitch of the plurality of the arms (42) matches a pitch of the plurality of spring pins (38).
7. The device as claimed in claim 1, wherein the device is modified for simultaenous caulking of fillers in atleast one conductor, or a series of conductors in winding.
8. A method of implementing the device as claimed in any of the claims 1-7, the method comprising:
inserting and holding the first position tool (37) in a gas flow channel (29’) and perpendicularly adjacent to the consecutive CNC milled slot recess (32) using the chamfer (36) and the space (35), so that the first position tool (37) supports the plurality of spring pins (38) and the plurality of arms (42) to slide inside the CNC milled slot recess (32);
fixing the packing rod (39) shrink fitted between the first position tool (37) and the CNC milled slot recess (32) to lock the first position tool (37) on its position in the gas flow channels (29’) as the motion of the first position tool (37) is negated by the CNC milled slot recess (32) at the abut surface (40) and the plurality of spring pins (38) moved inside the CNC milled slot recess (32);
shearing the fillers (30) in the CNC milled slot recess (32);
inserting and holding the second position tool (37’) in a consecutive gas flow channel (29’) and perpendicularly adjacent to another CNC milled slot recess (32) using the chamfer (36) and the space (35), so that the second position tool (37’) supports the plurality of arms (42) to slide inside the other CNC milled slot recess (32);
fixing packing rod (39) shrink fitted between first position tool (37) and the CNC milled slot recess (32) which locks the first position tool (37) on its position in the gas flow channels (29’) as the motion of the first position tool (37) is negated by the CNC milled slot recess (32) at the abut surface (40) and the plurality of arms (42) move inside the CNC milled slot recess (32) sandwiching the fillers (30) between the plurality of spring pins (38) of the first position tool (37) and the plurality of arms (42) of the second position tool (37’); and
performing caulking using caulking tools to ensure that the rotor coil (24) has sheared into a filler groove (34). , Description:DEVICE AND METHOD FOR CAULKING OF FILLERS IN CNC MILLED SLOT RECESS OF DYNAMOELECTRIC MACHINE ROTOR CONDUCTORS
TECHNICAL FIELD
[0001] The present disclosure, in general, relates to a dynamoelectric machine and, in particular, relates to a device for caulking of fillers in CNC miller center slots of dynamoelectric machine rotor conductors.
BACKGROUND
[0002] Background description includes information that may be useful in understanding the present invention. It is not an admission that any of the information provided herein is prior art or relevant to the presently claimed invention, or that any publication specifically or implicitly referenced is prior art.
[0003] In conventional dynamoelectric machines, an outer surface of a machine rotor is generally divided, in the circumferential direction, between winding regions and pole regions. Each winding region is provided with a plurality of axially extending slots separated by teeth.
[0004] The axially extending slots contain conductors which are connected at their ends to form the rotor winding. The conductors are made up of copper with a silver content of approximately 0.1%. As compared to electrolytic copper silver, alloyed copper features high strength properties at high temperature so that coil deformations due to thermal stresses are eliminated. The conductors are made of hard drawn silver bearing copper. The rectangular cross-section copper conductors have ventilating ducts thus providing a channel for air/gas flow for the purpose of cooling.
[0005] A plurality of individual conductors placed one over the other, in the slots on rotors peripheral surface and is bent to obtain half turns. Further, these half turns are brazed in series to form a coil on the rotor model. Dovetailed shaped wedges along the tops of the slot over the entire length of outer conductors secure the windings against centrifugal forces.
[0006] Further, the individual turns are insulated from each other by a layer of glass strips on the turn of copper and baked under pressure and temperature to give a monolithic inter-turn insulation. The coils are insulated from the rotor body by U-shaped glass laminate module slot made from glass cloth impregnated with epoxy varnish. At the bottom of the slot, D-shaped liners are disposed to provide a plane seating surfaces for conductors and to facilitate easy flow of air/gas from one side to another for cooling. These D-shaped liners are made from moulding material. The overhang winding is separated by glass laminated blocks called liners. The overhang windings are insulated from retaining rings segments having L-shape and made of glass cloth impregnated by epoxy resin.
[0007] In such structure of the conventional machine, the field’s exciting winding, which is embedded and wedged into slots in the rotor surface, generally carries current across its resistance, and therefore a heat is generated in the winding at a rate proportional to the product of its resistance and the square of the current (I2R). Such I2R heat, together with iron loss heating, combines to raise the temperature of the machine. Such heating of the machine has to be maintained below a designated temperature limit to ensure that winding temperature does not exceed prescribed insulation temperature ratings and that proper mechanical clearances are maintained.
[0008] For maintaining the temperature of the machine, cooling systems are provided for taking away the heat when the machine temperature rises above the designated temperature.
[0009] Conventional machine designs used air forced around and through the machine internal structures as the cooling medium. As machines became larger, designers switched from air cooled to hydrogen cooled machines as hydrogen is an excellent cooling medium, possessing excellent thermodynamic and transport properties: low specific heat capacity, low viscosity, and low density over the usual temperature range of interest. Also, hydrogen is 10 to 20 times more efficient than air as a cooling medium in the cooling application. However, a major drawback of the hydrogen cooling is that the hydrogen gas forms explosive mixtures with air over a wide range of hydrogen concentrations.
[0010] Therefore, in large machines, the rotor windings have recently been cooled by placing the coolant gas in direct contact with the rotor winding to more effectively dissipate the heat from the windings. The heat removing capacity is selected such that approximately identical temperature is obtained for all windings. In a rotor cooled in this manner, all or part of the windings is cooled by admitting cooling gas to pass within the main conductor insulation by means of ports located in end turn portions, under retaining rings. Also, the cold gas enters the overhang from under the retaining rings through a special chamber formed in the end shields and ducts under a fan hub and is further carried through a rotor conductor end windings to an intermediate portion of the rotor, and then exhausted to an air gap through pole face slots.
[0011] Furthermore, to guide the cold gas towards the center of the rotor so as to exhaust the same to the air gap, a slot wedge above the conductor consists of plurality of openings as per ventilation design and fillers of suitable dimensions and configuration are caulked in the middle of the slot recess to restrict and redirect the gas flow towards the said air gap.
[0012] However, during machine operation at 3000 revolutions per minute (rpm) and under high centrifugal forces, loosely fitted fillers tend to rattle and to migrate axially during starting, stopping as well as during the rotor operation. These movements are obviously undesirable. To restrict such filler movement, caulking, an act of shearing near the edges of an object to restrict its movement or to lock it is performed with the help of caulking chisel and hammer to ensure slot has sheared into the filler groove. Caulking is done in computer numeric controlled (CNC) milled slots of rotor conductors such that the, as per technical requirement of the machine, it is required that the filler is restrictedly located at the middle of the slot for hydrogen gas for cooling of rotor running at 3000 rpm.
[0013] However, with respect to the spatial constraints, it becomes very difficult to sightlessly caulk the filler at that design location. Therefore, chances were enhanced that the filler is not locked at the desired location and thereby providing an unbalance to the rotor and to achieve looseness free locking is complex and full of the possibility of error.
[0014] Therefore, there is a need for a device or an apparatus for caulking of fillers in CNC miller center slots of dynamoelectric machine rotor conductors.
OBJECTS OF THE DISCLOSURE
[0015] Some of the objects of the present disclosure, which at least one embodiment herein satisfy, are listed hereinbelow.
[0016] It is a general object of the present disclosure to provide a device and a method for caulking of fillers in center slots of dynamoelectric machine, i.e., rotor conductors, thus restricting fillers to not to show any tendency to rattle or migrate axially during starting, stopping as well as during the rotor in operation as well as to eliminate improper rotor balancing arising out of migrated fillers.
[0017] It is another object of the present disclosure to provide a mechanism of this kind in which the application of the said device to properly caulk the filler in conductor opening is independent of the manual force or dexterity of the operator.
[0018] It is another object of the present disclosure to provide a device and a mechanism for caulking of fillers of the above character, wherein the device for filler caulking have a minimum number of structurally durable parts cooperatively assembled in a compact organization.
[0019] It is yet another object of the present disclosure to provide a device and a mechanism for caulking of fillers of the above character, wherein the device will be used for caulking of more than one conductor at a time.
SUMMARY
[0020] This summary is provided to introduce concepts related to a device and a method for caulking of fillers in CNC miller center slots of dynamoelectric machine rotor conductors. The concepts are further described below in the detailed description. This summary is not intended to identify key features or essential features of the claimed subject matter, nor is it intended to be used to limit the scope of the claimed subject matter.
[0021] In an embodiment, the present disclosure relates to a device for caulking of fillers in computer numeric control (CNC) milled slot recess of dynamoelectric machine rotor conductors. The device includes a first position tool provided with a plurality of holes on a abut surface for insertion of a plurality of spring pins and for supporting a pre-tensioned spring arrangement to counter any tolerance in size of fillers during its manufacturing; a second position tool provided with a plurality of arms; a space and a chamfer provided on said first and second position tools to uprightly held the first and second position tools in gas flow channels, wherein the chamfer is formed to neatly and accurately insert in the space without any damage to rotor coil, and wherein a plurality of spaces, equalling the number of coil turns and their sharp edges, are rounded off so as to avoid any damage to the CNC milled slot recess; and a packing rod shrink fitted between the first and second position tools and the CNC slot recess to remove any looseness in the device.
[0022] In an aspect, the size of the plurality of spring pins and the plurality of arms are to be selected as per a ventilation diagram.
[0023] In an aspect, the space and the chamfer matches a conductor profile.
[0024] In an aspect, the plurality of spaces equals the number of coil turns in a rotor winding.
[0025] In an aspect, all sharp edges of the first and second position tool are rounded off so as to avoid any damage to the CNC milled slot recess.
[0026] In an aspect, on the first position tool, a pitch of the plurality of the arms matches a pitch of the plurality of spring pins.
[0027] In an aspect, the device can be modified for simultaenous caulking of fillers in atleast one conductor, or a series of conductors in winding.
[0028] In another embodiment, the present disclosure further relates to a method of implementing the inventive or proposed device of the present subject matter. The method begins with inserting and holding the first position tool in a gas flow channel and perpendicularly adjacent to the consecutive CNC milled slot recess using the chamfer and the space, so that the first position tool supports the plurality of spring pins and the plurality of arms to slide inside the CNC milled slot recess; followed with fixing the packing rod shrink fitted between the first position tool and the CNC milled slot recess to lock the first position tool on its position in the gas flow channels as the motion of the first position tool is negated by the CNC milled slot recess at the abut surface and the plurality of spring pins moved inside the CNC milled slot recess; and shearing the fillers in the CNC milled slot recess. Then, the method includes inserting and holding the second position tool in a consecutive gas flow channel and perpendicularly adjacent to another CNC milled slot recess using the chamfer and the space, so that the second position tool supports the plurality of arms to slide inside the other CNC milled slot recess, and thereafter fixing packing rod shrink fitted between first position tool and the CNC milled slot recess which locks the first position tool on its position in the gas flow channels as the motion of the first position tool is negated by the CNC milled slot recess at the abut surface and the plurality of arms move inside the CNC milled slot recess sandwiching the fillers between the plurality of spring pins of the first position tool and the plurality of arms of the second position tool. Then, the caulking is performed using caulking tools to ensure that the rotor coil has sheared into a filler groove.
[0029] Various objects, features, aspects, and advantages of the inventive subject matter will become more apparent from the following detailed description of preferred embodiments, along with the accompanying drawing figures in which like numerals represent like components.
BRIEF DESCRIPTION OF THE DRAWINGS
[0030] The illustrated embodiments of the subject matter will be best understood by reference to the drawings, wherein like parts are designated by like numerals throughout. The following description is intended only by way of example, and simply illustrates certain selected embodiments of devices, systems, and methods that are consistent with the subject matter as claimed herein, wherein:
[0031] FIG. 1 illustrates a line representation of the magnetic flux path of an alternating current generator;
[0032] FIG. 2 illustrates a line representation of the slot cross section the slots containing conductors which are connected at their ends to form the rotor winding;
[0033] FIG. 3 illustrates a line representation of the cooling arrangement in coils large size turbo-generator in accordance with an exemplary embodiment of the present disclosure;
[0034] FIG. 4, 5, and 6 illustrate a line representation of the laying structure of individual turns of a winding in rotor slot, ventilation duct, and its insulation method in accordance with an exemplary embodiment of the present disclosure;
[0035] FIG. 7 illustrates the line representation of conductor profile in the rotor slot and its insulation method in accordance with an embodiment of the present disclosure;
[0036] FIGS. 8 and 9 illustrates the line representation of the proposed device, in accordance with an embodiment of the present disclosure; and
[0037] FIG. 10 illustrates a method of implementing the proposed device, in accordance with an embodiment of the present disclosure;
DETAILED DESCRIPTION
[0038] The present disclosure relates to dynamoelectric machine, i.e., rotor’s cooling and ventilation, and more particularly to a proposed or improved device or apparatus for obtaining great accuracy in caulking of fillers to ensure adequacy of winding’s cooling arrangement for dynamoelectric rotors, such as the rotor of a hydrogen-cooled generator having direct-cooled windings by providing designated cooling gas flow path in rotor for its cooling while running at synchronous speed, along with a method and device that are simple, economical, foolproof and inherently free from tendency to error or fall out of adjustment.
[0039] The present disclosure is directed to solve the above-described problems mentioned in the background section and to provide a method and device of caulking of fillers in center slots of dynamoelectric machine rotor conductors in accordance with the present disclosure and to enable to accurately caulk the fillers easily and in short time.
[0040] With the present disclosure, it is sought to cure the defects existing in the art as mentioned in part above, and to provide a method and device of caulking fillers in center slots of turbo-generator rotor having low initial cost and upkeep, great and continuing accuracy inherent in its design and operation, ruggedness and simplicity in its construction and operation, all to the ultimate end of faithfully and consistently reproducing quality in caulking fillers.
[0041] The following is a detailed description of embodiments of the disclosure depicted in the accompanying drawings. The embodiments are in such detail as to clearly communicate the disclosure. However, the amount of detail offered is not intended to limit the anticipated variations of embodiments; on the contrary, the intention is to cover all modifications, equivalents, and alternatives falling within the spirit and scope of the present disclosure as defined by the appended claims.
[0042] As used in the description herein and throughout the claims that follow, the meaning of “a,” “an,” and “the” includes plural reference unless the context clearly dictates otherwise. Also, as used in the description herein, the meaning of “in” includes “in” and “on” unless the context clearly dictates otherwise.
[0043] Further, before describing the present subject matter in detail the method and device of caulking of fillers in center slots of dynamoelectric machine rotor conductors, it should be observed that the present subject matter resides primarily in a novel and non-obvious combination of hardware elements and method steps. Accordingly, these elements and steps have been represented by conventional elements and steps in the drawings, showing only those specific details that are pertinent to the present invention so as not to obscure the disclosure with details that will be readily apparent to those skilled in the art having the benefit of the description herein.
[0044] FIG. 1 illustrates a general construction of a 2-pole rotating field alternating current (AC) generator. In FIG. 1, yoke 1, solid pole shoes 2, and laminated pole body 3 are shown with field windings 20 embedded in rotor slots 11. Outside the rotating field/rotor 10, a stator 4 carrying a stationary armature winding 5 in its slot is shown. Apart from these components, a damper winding 6 and an air gap 29 are also shown in FIG. 1.
[0045] FIG. 2 illustrates a general construction of the AC generator rotor in detail. In FIG. 2, the field windings 20 are embedded and wedged into rotor slots 11 peripheral surface 12 of the rotor 10. The rotor slots 11 cover only part of the peripheral surface 12 and are disposed on either side of the poles 13, the whole field winding 20 forming a spiral around each pole center.
[0046] Referring now to FIG. 3 in detail, the outer/peripheral surface 12 of the rotor 10 is generally divided, in the circumferential direction, between winding regions 11 and pole regions 13. Each winding region is provided with a plurality of axially extending slots 11, separated by teeth 15, where the axially extending slots 11 containing conductors which are connected at their ends to form the rotor winding 20.
[0047] Referring now to FIG. 4 in detail, rectangular cross section copper conductors 25 have annular ventilating ducts 21, and thus providing a longitudinal channel 22 for hydrogen flow. Further, a plurality of individual conductors 25 placed, one over the other, in the slots 11 on rotor’s outer/peripheral surface 12 and are bent to obtain half turns. Further, these obtained half turns are brazed in series to form a coil on the rotor model. Dovetailed shaped wedges 23 having intermittent openings 31, along with the top of the slot 11 over the entire length of outer conductor 25, secure the windings 20 against centrifugal forces arising due to rotation of the rotor 10. The windings 20 are shown in more detail in FIG. 5.
[0048] As illustrated in FIGS. 6(a) and 6(b), the individual turns 24 in a winding 20 are insulated from each other by a layer of glass strips 26 on the turn of copper and baked under pressure and temperature to give a monolithic inter-turn insulation. The coils 24 are insulated from rotor body 10 by U-shaped glass laminate 27. At the bottom of slots, D-shaped liners 28 are disposed to provide a plane seating surfaces for conductors 25 and to facilitate easy flow of gas from one side to another.
[0049] To guide the cold gas towards the center of the rotor so as to exhaust the same to the air gap 29, the slot wedge 23 above the conductor 25 consists of a plurality of openings 31 as per ventilation design is shown in FIG. 7, and fillers 30 are caulked in the middle of the slot recess 32 to restrict and redirect the gas flow towards the said air gap 29.
[0050] These vertical openings 31, radial to the rotor and on the peripheral surface 23’ of the slot wedge 23, meet perpendicularly with the longitudinal channel 22 thus providing a plurality of gas flow channels 29’ for hot hydrogen to move to the air gap 29. The air gap takes the hot gas to a heat exchanger to reject the heat and enter from the overlapped and brazed overhang end 14 of coil 24 again and thereby completing the ventilation cycle.
[0051] Referring now to FIGS. 8 and 9, before caulking fillers 30 in the CNC milled slot recess 32, the fillers 30 are placed inside and below the slot recess 32 created between intermittent gas flow channels 29’. Fillers are kept shorter in length with respect to slot recess 32 in order to adequately provide gas with a diffuser space 33 so as to counter any axial thrust arising out of abrupt gas flow direction change from D1 to D2, as shown in FIG. 7. A constant challenge which not only requires operator dexterity and experience but also require a lot of manufacturing time is to blindly and at the same time perfectly placing more than 1000 such fillers in this plurality of slot recess 32 to create the ventilation circuit without error.
[0052] However, power plant turbo generators operate at 3000 rpm and under high centrifugal forces therefore loosely fitted fillers 30 tend to rattle and to migrate axially during starting, stopping as well as during the rotor operation. Axial thrust from hot hydrogen gas makes these fillers more vulnerable to such migration. These movements are undesirable for obvious reasons.
[0053] To restrict such filler movement, caulking is performed with the help of caulking tools to ensure coil 24 has sheared into the filler groove 34 which in turn requires that the filler is restrictedly located at the middle of the slot recess 32 i.e., at its design location. Fillers are kept shorter in length with respect to slot recess 32 in order to adequately provide gas with a diffuser space 33. Also, a packing 39 is provided for locking a first position tool 37 and a second position tool 37’.
[0054] Through the provisions of the space, the first position tool 37 can be uprightly held and a chamfer 36 helps in the fixture to be inserted neatly and accurately in a space 35 without any damage to the coil 24. A plurality of spaces 35, equaling the number of coils turns 24 and their sharp edges, are rounded off so that any damage to CNC milled slot recess 32 can be avoided.
[0055] The first position tool 37 is provided with a plurality of holes 41 for pin insertion and to support pre-tensioned spring arrangement 43 which helps to cope up any tolerance in size of fillers 30 during its manufacturing. The packing rod 39 fits in the remaining space of so prevent any looseness in the fixture.
[0056] As filler of different sizes are generally manufactured from the cutter and therefore, unlike CNC finish, there exists a tolerance of up to 0.05-0.2 mm between the size of the slot and the filler. To provide a counter to such tolerance, spring pins 38 are provided. The position tools 37, 37’ are sidewise placed in gas flow channels 29’ in such a way that the space 35 and the chamfer 36 matches conductor 25 profile 25’. On this side, packing rod 39 is shrink-fitted between the position tools 37, 37’ and the slot recess 32 created intermittently between the gas flow channels 29’ and pushes the position tools 37, 37’ to lock on its position in the gas flow channels 29’ as the shrink fit position tool forward motion is restricted by the slot recess 32 at a abut surface 40.
[0057] Filler 30 is pushed in the slot recess 32 so that it abuts between spring pin 38 of the first position tool 37 and arm 42 of the second position tool 37’. The length of these spring pin and arm are to be selected as per ventilation diagram. Once the filler is locked at its designated place, caulking is performed with the help of caulking tools to ensure the coil 24 has sheared into the filler groove 34.
[0058] FIG. 10 illustrates a method 100 implementing the proposed device in accordance with an embodiment of the present disclosure. The order in which the method 100 is described is not intended to be construed as a limitation, and any number of the described method blocks may be combined in any order to implement the method 100, or an alternative method.
[0059] At block 102, the method 100 includes inserting and holding the first position tool 37 in a gas flow channel 29’ and perpendicularly adjacent to the consecutive CNC milled slot recess 32 using the chamfer 36 and the space 35, so that the first position tool 37 supports the plurality of spring pins 38 and the plurality of arms 42 to slide inside the CNC milled slot recess 32.
[0060] At block 104, the method 100 includes fixing the packing rod 39 shrink fitted between the first position tool 37 and the CNC milled slot recess 32 to lock the first position tool 37 on its position in the gas flow channels 29’ as the motion of the first position tool 37 is negated by the CNC milled slot recess 32 at the abut surface 40 and the plurality of spring pins 38 moved inside the CNC milled slot recess 32.
[0061] At block 106, the method 100 includes shearing the fillers 30 in the CNC milled slot recess 32.
[0062] At block 108, the method 100 includes inserting and holding the second position tool 37’ in a consecutive gas flow channel 29’ and perpendicularly adjacent to another CNC milled slot recess 32 using the chamfer 36 and the space 35, so that the second position tool 37’ supports the plurality of arms 42 to slide inside the other CNC milled slot recess 32.
[0063] At block 110, the method 100 includes fixing packing rod 39 shrink fitted between first position tool 37 and the CNC milled slot recess 32 which locks the first position tool 37 on its position in the gas flow channels 29’ as the motion of the first position tool 37 is negated by the CNC milled slot recess 32 at the abut surface 40 and the plurality of arms 42 moves inside the CNC milled slot recess 32 sandwiching the fillers 30 between the plurality of spring pins 38 of the first position tool 37 and the plurality of arms 42 of the second position tool 37’.
[0064] At block 112, the method 100 includes performing caulking using suitable caulking tools to ensure that the rotor coil 24 has sheared into the filler groove 34.
[0065] Although the present discussion relates to method and device of caulking fillers in ventilation circuit of a turbo-generator rotor, more particularly, the method and device shall enable caulking of such fillers, it will be appreciated that the device and methods discussed may be readily adapted for use with other similar procedures. The present disclosure proposes a mechanism to lock these fillers adequately at their design location with a provision to self-adjust against any deviation in size of the fillers to be caulked or other surface irregularities because of side packing etc., and prevents any filler looseness by properly caulking the same which greatly enhances the safety of the ventilation system and of the turbo-generator for that matter.
[0066] Since plurality of arms 42 and spring pin 38 are provided on the said position tools 37, 37’, such an arrangement provides an inherent advantage of caulking plurality of fillers in one go, thereby saving crucial man hours and operator efforts which not only make the device to be more ergonomic but also makes the operation to be lesser dependent on operator dexterity.
[0067] Further, it will be appreciated that those skilled in the art will be able to devise various arrangements that, although not explicitly described or shown herein, embody the principles of the invention and are included within its scope.
[0068] Furthermore, all examples recited herein are principally intended expressly to be only for pedagogical purposes to aid the reader in understanding the principles of the invention and the concepts contributed by the inventor(s) to furthering the art and are to be construed as being without limitation to such specifically recited examples and conditions. Also, the various embodiments described herein are not necessarily mutually exclusive, as some embodiments can be combined with one or more other embodiments to form new embodiments.
[0069] The above description does not provide specific details of the manufacture or design of the various components. Those of skill in the art are familiar with such details, and unless departures from those techniques are set out, techniques, known, related art or later developed designs and materials should be employed. Those in the art are capable of choosing suitable manufacturing and design details.
[0070] The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the present disclosure. It will be appreciated that several of the above-disclosed and other features and functions, or alternatives thereof, may be combined into other systems or applications. Various presently unforeseen or unanticipated alternatives, modifications, variations, or improvements therein may subsequently be made by those skilled in the art without departing from the scope of the present disclosure as encompassed by the following claims.
[0071] The claims, as originally presented and as they may be amended, encompass variations, alternatives, modifications, improvements, equivalents, and substantial equivalents of the embodiments and teachings disclosed herein, including those that are presently unforeseen or unappreciated, and that, for example, may arise from applicants/patentees and others.
[0072] While the foregoing describes various embodiments of the invention, other and further embodiments of the invention may be devised without departing from the basic scope thereof. The scope of the invention is determined by the claims that follow. The invention is not limited to the described embodiments, versions or examples, which are included to enable a person having ordinary skill in the art to make and use the invention when combined with information and knowledge available to the person having ordinary skill in the art.