FIELD OF INVENTION:
[001] The present subject matter described herein, relates to a drum brake service of the wheel of a vehicle, and, in particular, to a tool for assembly and disassembly of brake shoe. More particularly to a tool for assembly and disassembly of brake shoe hold down spring from the rear brake assembly.
BACKGROUND AND PRIOR ART:
[002] The brake shoes are assembled in the Drum brake assemblies. Due to the brake shoes, the driver can stop the vehicle as per his desire. Servicing of the brake shoe is a difficult task which consumes lot of energy. Fig. 1 illustrates the assembly of rear brake 100, the rear brake assembly 100 includes rear brake shoe component 101, shoe hold down cup 105, shoe hold down spring 104, shoe hold down pin 103, and back plate 102. There is no well-established method to remove and fix the spring, cup, and pin set of brakes during service. Brake manufacturers do it using a machine and special jigs, which are not feasible in service as the brakes will be attached on to the vehicle.
[003] Fig. 2 illustrates components of the rear brake assembly 100, such as the spring, cup and pin. Fig. 3 illustrates the cross section view of the rear brake assembly 100 with the spring 104, cup 105, and pin 103. Fig. 4 illustrate the direction of the rotation for the disassembly of the pin in the cup. Currently when the shoe has to be replaced during service, the cup 105 is pressed hard by some means and turned (by ~90o), so that the pin 103 gets off the seating on the cup 105. The pin 103 has to be held from behind the back plate 102 to prevent its rotation. Then, Cup has to be pushed down with approximately 20 Kgf, which is really difficult to be applied with hand. Similarly to fit a new shoe on the back plate 102, the cup 105 and the spring 104 are pressed with some means and turned while the pin 103 being inserted from the other side of the back plate 102 as illustrated in the Fig 4.
[004] There are many disadvantages associated with the previously known methods which are given below:
1. Excessive strain on hand muscles as ~20kgf need to be applied with hand.
2. If by mistake the equipment with which the spring in pressed slips, the spring and the cup will pop out. This can cause injuries to the people nearby.
3. The process is time consuming.
[005] Therefore, there is a need in the art to provide a tool which can be more simple and inexpensive, and which can be used for removing and fitment of the rear brake shoe.
SUMMARY OF THE INVENTION:
[006] The subject matter disclosed herein relates to a tool for removing and fitment of brake shoe hold down spring in brake shoe component of a vehicle. The tool consists of two parts one is clamper arm and other is depressor arm. Both the arms are hingedly connected with each other at one end. Both the arms can independently rotate about the hinge joint. The clamper arm has first end and second end, where the second end has an aperture for hinge joint with the depressor arm. The first end defines a handle portion with combination of depressor arm for application of force. The clamper arm further comprising a rectangular slot which is proximal to the second end and a cup slip preventer extending in downward direction from lower surface of the clamper arm along boundary of the rectangular slot. Further, a pair of L shaped legs is provided at the lower surface just above the cup slip preventer and proximal to the second end. The depressor arm has first end and a second end where the second end is perpendicular to the first end. The second end has an elongated member for the hinge joint with the clamper arm. The depressor arm further comprising a rectangular nose plier slot which is proximal to the second end and a pair of depressor legs extending in vertical downward direction from longitudinal sides of the rectangular slot. The clamper arm is hingedly connected with the depressor arm to form the tool.
[007] In order to further understand the characteristics and technical contents of the present subject matter, a description relating thereto will be made with reference to the accompanying drawings. However, the drawings are illustrative only but not used to limit scope of the present subject matter.
BRIEF DESCRIPTION OF THE DRAWINGS
[008] It is to be noted, however, that the appended drawings illustrate only typical embodiments of the present subject matter and are therefore not to be considered for limiting of its scope, for the invention may admit to other equally effective embodiments. The detailed description is described with reference to the accompanying figures. In the figures, the left-most digit(s) of a reference number identifies the figure in which the reference number first appears. The same numbers are used throughout the figures to reference like features and components. Some embodiments of system or methods in accordance with embodiments of the present subject matter are now described, by way of example, and with reference to the accompanying figures, in which:
[009] Fig. 1 illustrate existing assembly of rear brake, in accordance with an embodiment of the present subject matter;
[0010] Fig. 2, 3, and 4 illustrates spring, cup and pin assembly in the rear brake assembly and removing and fixing of the same with the known methods;
[0011] Fig. 5 illustrates construction of tool for removing and fixing of brake shoe cup, spring, and pin in the rear brake shoe assembly, in accordance with an embodiment of the present subject matter;
[0012] Fig. 6 illustrates perspective view of clamper part of the tool, in accordance with an embodiment of the present subject matter;
[0013] Fig. 7a, 7b, and 7c illustrate views of the clamper part of the tool, in accordance with an embodiment of the present subject matter;
[0014] Fig. 8 illustrates perspective view of depressor part of the tool, in accordance with an embodiment of the present subject matter;
[0015] Fig. 9a, 9b, and 9c illustrate views of the depressor part of the tool, in accordance with an embodiment of the present subject matter; and
[0016] Fig. 10 and 11 illustrate working of the tool for assembly and disassembly of rear brake shoe assembly, in accordance with an embodiment of the present subject matter.
[0017] The figures depict embodiments of the present subject matter for the purposes of illustration only. A person skilled in the art will easily recognize from the following description that alternative embodiments of the structures and methods illustrated herein may be employed without departing from the principles of the disclosure described herein.
DESCRIPTION OF THE PREFERRED EMBODIMENTS:
[0018] The subject matter disclosed herein relates to a tool for removing and fitment of brake shoe hold down spring in brake shoe component of a vehicle. The tool consists of two parts one is clamper arm and other is depressor arm. Both the arms are hingedly connected with each other at one end. Both arms can independently rotate about the hinge joint. The clamper arm has first end and second end, where the second end has an aperture for hinge joint with the depressor arm. The first end defines a handle portion with combination of depressor arm for application of force. The clamper arm further comprising a rectangular slot which is proximal to the second end and a cup slip preventer extending in downward direction from lower surface of the clamper arm along boundary of the rectangular slot. Further, a pair of L shaped legs is provided at the lower surface just above the cup slip preventer and proximal to the second end. The depressor arm has first end and a second end where the second end is perpendicular to the first end. The second end has an elongated member for the hinge joint with the clamper arm. The depressor arm further comprising a rectangular nose plier slot which is proximal to the second end and a pair of depressor legs extending in vertical downward direction from longitudinal sides of the rectangular slot. The clamper arm is hingedly connected with the depressor arm to form the tool.
[0019] It should be noted that the description and figures merely illustrate the principles of the present subject matter. It should be appreciated by those skilled in the art that conception and specific embodiment disclosed may be readily utilized as a basis for modifying or designing other structures for carrying out the same purposes of the present subject matter. It should also be appreciated by those skilled in the art that by devising various arrangements that, although not explicitly described or shown herein, embody the principles of the present subject matter and are included within its spirit and scope. Furthermore, all examples recited herein are principally intended expressly to be for pedagogical purposes to aid the reader in understanding the principles of the present subject matter 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. The novel features which are believed to be characteristic of the present subject matter, both as to its organization and method of operation, together with further objects and advantages will be better understood from the following description when considered in connection with the accompanying figures.
[0020] These and other advantages of the present subject matter would be described in greater detail with reference to the following figures. It should be noted that the description merely illustrates the principles of the present subject matter. It will thus be appreciated that those skilled in the art will be able to devise various arrangements that, although not explicitly described herein, embody the principles of the present subject matter and are included within its scope.
[0021] Fig. 5 illustrates the construction of tool for assembly and disassembly of the rear brake shoe assembly, in accordance with an embodiment of the present subject matter. The present tool helps in removing and fitting shoe easily on brake back plate during service. The tool 700 has a clamper arm 500 and a depressor arm 600. The clamper arm 500 and the depressor arm 600 are joined with a hinge joint 700 to form the tool 700. The tool 700 is made of metal material. Referring to figure 6, the clamper arm 500 has a first end 501 and a second end 503. The second end 503 has an aperture 503a for the hinge joint 701 with the depressor arm 600. The first end 501 defines a handle portion in combination with the depressor arm 600.
[0022] The clamper arm 500 includes a rectangular slot 502 proximal to the second end 503 as shown in the figure 7a. As clearly illustrated in the figure 7a, the first end 501 is wider than the second end 503. The second end 503 has width X1 whereas the first end has width X. The second end 503 is cut down to narrow width X1 to receive second end of the depressor arm 600 to form a side hinge joint 701. Further, the clamper arm 500 has a cup slip preventer 505 which is vertical slits extending in downward direction from lower surface 500b of the clamper arm 500 along longitudinal boundary 502b of the rectangular slot 502. The cup slip preventer 505 prevents slipping of the cup 105 during fitment of the pin 103 into the rear brake shoe assembly 1100 as shown in the figure 11.
[0023] The clamper arm 500 includes a pair of L shaped legs 504 which is provided at the lower surface 503b just above the cup slip preventer 505 proximal to the second end 503 as shown in the figure 7b. As shown in the figure 7b, vertical portion 504a of the pair of L shaped legs 504 is joined with the lower surface 500b of the clamper arm 500 and horizontal portion 504b extend perpendicularly toward the first end 501 from the vertical portion 504a. The pair of L shaped legs 504 helps to clamp the tool on the shoe plate. As clearly illustrates in the figure 7b, the vertical portion 504a of the pair of L shaped legs is longer than vertical length of the cup slip preventer 505. The vertical portion 504a of the pair of L shaped legs 504 has length L2 whereas the cup slip preventer 505 has vertical length L1. The difference between the L1 and L2 is provided for clamping and placing the tool on the shoe 101.
[0024] As shown in the figure 8, the depressor arm 600 includes a first end 601 and a second end 603. The depressor arm 600 is in L shape. In the L shaped profile, the second end 603 is perpendicular to the first end 601. The vertical portion of the L shaped profile of the depressor arm 600 is substantially longer than the second end 603. The second end 603 has an elongated member 603a which extend toward the aperture 503a of the clamper arm 500 for the hinge joint 701. The elongated member 603a inserted in the aperture 503a of the clamper arm 500 to form a hinge joint. By this hinge joint 701, the clamper arm 500 and the depressor arm 600 are hingedly joined with each other as shown in the figure 5. The first end 501 of the clamper arm 500 and the first end 601 of the depressor arm 600 combinedly act as a handle portion or handle end for application of force/pressure on the other end.
[0025] The depressor arm 600 includes a rectangular nose plier slot 602 proximal to bent portion 603b of the second end 603. Further, the depressor arm 600 has a pair of depressor legs 604 extending in vertical downward direction from longitudinal sides 602b of the rectangular nose plier slot 602. The rectangular nose plier slot 602 is aligned with the rectangular slot 502 of the clamper arm 500 in assembled tool 700. During application of force on the handle potion (601 and 501), the tool 700 rotates about the hinge joint 701 and the pair of depressor legs 604 moves inside the rectangular slot 502 of the clamper arm 500 to push the cup 105 from top.
[0026] The second end 603 has a cut to receive the second end 503 of the clamper arm 500 to form same width tool. Figure 9a illustrates the shape of the nose plier slot 602 which is rectangular. From this slot, a nose plier can be inserted to rotate the pin 103 during removal and fitment of brake shoe assembly. Figure 9b illustrates the side view of the depressor arm 600 and figure 9c illustrates front view of the depressor arm 600.
[0027] Fig. 10, 11, and 12 illustrate how the present tool is used during braking service for removal and fitment of the brake shoe component. As shown in the figure 10, the present tool 700 is hand held tool by handle portion which is combination of the first end 501 of the clamper arm 500 and the first end 601 of the depressor arm 600. In order to remove the shoe from the rear brake assembly, the tool 700 is to be used in a specified manner. Firstly, the tool is hand held and then tool is clamped on the rear brake shoe component 1101 with the pair of L shaped legs 504 as shown in the figure 10. Force is applied on the tool handles 501+601 as shown in the figure 10 just like pressing a plier. The legs of the depressor 604 press the cup 1105 and the spring 1104 beneath it. Once the spring 1104 is depressed, a nose plier is inserted through the nose plier slot 602 to turn the pin 1103 to get it off the cup seating. After this, the force applied on the handles using palm can be reduced, thereby safely removing spring 1104 and the cup 1105.
[0028] For attaching the brake shoe component, following steps are to be followed. Firstly, the tool 700 is hand held. Then the brake shoe component 1101 is placed on the back plate 1102 at the right position. The tool 700 is then clamped on to the brake shoe component 1101 with the Clamper Legs 504 as shown in Figure 10 and 11. The spring 1104 and the cup 1105 are inserted through the rectangular slot 502 on the clamper arm 500. The cup slip preventer 505 holds them in place. The pin 1103 is inserted from behind the back plate 1102. Force is applied on the tool handles as shown in Figure 10, just like pressing a plier. The legs 604 of the depressor arm 600 press the cup 1105 and the spring 1104 beneath it. Once the spring 1104 is depressed, a nose plier can be inserted through the nose plier slot 602 of the depressor arm 600 to turn the pin 1103 to place it on the cup seating. Or, the pin 1103 can be turned by 90o with index finger of the other hand, making the pin 1103 to sit on the cup seating. After this the force applied on the handles using palm can be reduced, thereby safely fitting the shoe.
[0029] The main advantage of the tool is that force applied in the process of removing or attaching the aforementioned spring is considerably reduced from ~20kgf to ~4.6kgf with a lever ratio of about 4.3 provided by the tool.
[0030] The process can be safely done as there won’t be cup slip and pop off. Shoe assemblies can be changed in less time, with the present tool.
[0031] Although embodiments for the present subject matter have been described in language specific to structural features, it is to be understood that the present subject matter is not necessarily limited to the specific features described. Rather, the specific features and methods are disclosed as embodiments for the present subject matter. Numerous modifications and adaptations of the system/component of the present invention will be apparent to those skilled in the art, and thus it is intended by the appended claims to cover all such modifications and adaptations which fall within the scope of the present subject matter.

We claim:
1. A tool (700) for removing and fitment of brake shoe hold down spring in brake shoe component of a vehicle, the tool (700) comprising:
a clamper arm (500) having first end (501) and second end (503), the second end (503) has an aperture (503a) for hinge joint (701) and the first end (501) define a handle portion, the clamper arm (500) comprising:
a rectangular slot (502) proximal to the second end (503);
a cup slip preventer (505) extend in downward direction from lower surface (500b) of the clamper arm (500) along boundary of the rectangular slot (502);
a pair of L shaped legs (504) provided at the lower surface (503b) above the cup slip preventer (505) proximal to the second end (503); and
a depressor arm (600) having first end (601) and a second end (603), the second end (603) is perpendicular to the first end (601), wherein the second end (603) has an elongated member (603a) for the hinge joint (701) with the clamper arm (500), the depressor arm (600) comprising:
a rectangular nose plier slot (602) proximal to the second end (603);
a pair of depressor legs (604) extending in vertical downward direction from longitudinal sides (602b) of the rectangular slot (602);
wherein the clamper arm (500) is hingedly connected with the depressor arm (600) to form the tool (700).
2. The tool (700) as claimed in claim 1, wherein the rectangular nose plier slot (602) of the depressor arm (600) aligned with the rectangular slot (502) of the clamper arm (500).
3. The tool (700) as claimed in claim 1, wherein the first end (501) of the clamper arm (500) and the first end (601) of the depressor arm (600) define a handle region for application of force.
4. The tool (700) as claimed in claim 1, wherein the pair of depressor legs (604) moves inside the rectangular slot (502) of the clamper arm (500) to apply pressure on a cup (105) and a shoe hold down spring (104).
5. The tool (700) as claimed in claim 1, wherein the tool (700) is clamped on the brake shoe component (101) through the pair of L shaped legs (504).
6. The tool (700) as claimed in claim 1, wherein vertical length (L1) of the cup slip preventer (505) is smaller than vertical length (L2) of the pair of L shaped legs (504).
7. The tool (700) as claimed in claim 1, wherein the aperture (503a) of the second end (503) of the clamper arm (500) receives the elongated member (603a) to form a hinge joint (701).
8. The tool (700) as claimed in claim 4, wherein the depressor arm (600) is L shaped arm.
9. The tool (700) as claimed in claim 1, wherein the brake shoe component is rear brake shoe component.
10. The tool (700) as claimed in claim 1, wherein the tool (700) has lever ration of about 4.3.