Brake chamber holding tool

Abstract

To provide a brake chamber holding tool that can reliably perform precise positioning in the disassembly and assembly process of a brake chamber, while greatly reducing the labor required and shortening the working time. [Solution] The brake chamber holding tool is a clamp having two clamping portions and a grip portion, with a first support portion provided on one of the two clamping portions and a second support portion provided on the other, the first support portion having a support hole portion into which a release bolt inserted into the piggyback of the brake chamber can be inserted, and the second support portion having a locking portion that can be locked to a base cylinder extending from the base of the brake chamber, and by inserting the release bolt into the support hole portion and locking the locking portion to the base cylinder, the first support portion and the second support portion support the brake chamber from both sides of the line with the central axis of the release bolt and the central axis of the base cylinder positioned on the same line.

Description

[Technical Field]

[0001] This invention relates to a brake chamber holding tool used when disassembling and assembling a brake chamber to replace a diaphragm or other part inside the brake chamber. [Background technology]

[0002] Patent Document 1 discloses a brake chamber having a structure in which a piston that advances a push rod that operates a vehicle's brake device into the brake device is released by a release bolt. In this brake chamber, a diaphragm is sandwiched between a housing and a cup, and when compressed air is supplied between the diaphragm and the housing, the diaphragm deforms, pushing the push rod via a push plate, thereby operating the brakes. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Laid-Open No. 2012-241800 Summary of the Invention [Problem to be solved by the invention]

[0004] The brake chamber described in Patent Document 1 requires periodic disassembly and assembly for purposes such as replacing a diaphragm that has deteriorated over time. During the disassembly process, particularly in the case of brake chambers for trailers and other freight vehicles, the clamp ring that secures the piggyback and base is firmly attached, requiring significant effort and a long time to remove them while supporting the piggyback and base. Furthermore, during the assembly process, the piggyback and base must be precisely aligned so that the central axes of the release bolt, piston, push rod, etc. are aligned on the same straight line to ensure that there is no leakage of compressed air and that braking operation is reliable. Conventionally, however, adjustments were made while the piggyback and base were temporarily secured with cable ties, resulting in extremely inefficient work.

[0005] Therefore, the object of this invention is to provide a brake chamber holding tool that can significantly reduce the labor and time required for disassembling and assembling the brake chamber while ensuring precise alignment. [Means for solving the problem]

[0006] In order to solve the above problems, the brake chamber holding tool of the present invention is a brake chamber holding tool that is a clamp having two opposing clamping portions and a grip portion that allows the spacing between the two clamping portions to be changed and the clamping portions to be fixed at a desired spacing, in which a first support portion is provided on one of the two clamping portions and a second support portion is provided on the other, and the first support portion has a support hole portion into which a release bolt inserted into the piggyback of the brake chamber can be inserted, and the second support portion has a locking portion that can be engaged with a base cylinder extending from the base of the brake chamber, and by inserting the release bolt into the support hole portion and locking the locking portion to the base cylinder, the central axis of the release bolt and the central axis of the base cylinder are positioned on the same straight line, and the brake chamber is supported on both sides of the straight line by the first support portion and the second support portion.

[0007] In the brake chamber holding tool of the present invention, it is preferable that the first support portion is flat, the support hole portion penetrates the first support portion in the thickness direction, and the release bolt is inserted into the support hole portion.

[0008] In the brake chamber holding tool of the present invention, it is preferable that the second support portion is flat, and the locking portion is cut out from the outer edge of the second support portion to the center and penetrates the second support portion in the thickness direction. [Effects of the Invention]

[0009] According to the present invention, it is possible to provide a brake chamber holding tool that can significantly reduce the labor and time required for disassembling and assembling the brake chamber while ensuring precise alignment. [Brief explanation of the drawings]

[0010] [Figure 1] 1 is a perspective view showing the configuration of a brake chamber holding tool according to an embodiment of the present invention; [Figure 2] 2 is a plan view showing the configuration of the brake chamber holding tool shown in FIG. 1. [Figure 3] 1(a) is a side view of the brake chamber holding tool as seen from the first support part side, and FIG. 1(b) is a side view of the brake chamber holding tool as seen from the second support part side. [Figure 4] FIG. 3 is an enlarged plan view of a part of FIG. 2. [Figure 5] 1A and 1B are diagrams showing the configuration of a brake chamber, where 1A is an exploded perspective view and 1B is an exploded side view. [Figure 6] 2(a) is a perspective view showing a state in which the brake chamber holding tool shown in FIG. 1 is attached to the brake chamber, and FIG. 2(b) is a side view showing the configuration of the brake chamber before disassembly or after assembly. [Figure 7] 10(a) is a perspective view showing the configuration of a first support part according to a modified example, and FIG. 10(b) is a perspective view showing the configuration of a second support part according to a modified example. DETAILED DESCRIPTION OF THE INVENTION

[0011] A brake chamber holding tool according to an embodiment of the present invention will be described in detail below with reference to the drawings. Fig. 1 is a perspective view showing the configuration of the brake chamber holding tool according to this embodiment, Fig. 2 is a plan view showing the configuration of the brake chamber holding tool shown in Fig. 1, Fig. 3(a) is a side view of the brake chamber holding tool as seen from the first support part side, Fig. 3(b) is a side view of the brake chamber holding tool as seen from the second support part side, and Fig. 4 is a plan view showing an enlarged portion of Fig. 2.

[0012] As shown in FIGS. 1 to 3, the brake chamber holding tool 10 of this embodiment includes a clamper 20, a first support portion 30, and a second support portion 40.

[0013] As shown in Figure 2 or Figure 3, the clamper 20 includes a pair of base portions 21a, 21b, a pair of clamping portions 22a, 22b, a pair of grip portions 23a, 23b, a connecting rod member 24, a rotation operation member 25, and a lock release member 26.

[0014] The pair of bases 21a, 21b extend in directions away from each other from the joint so as to form a U-shaped open space, and extend parallel to each other forward from the tip of the extension.

[0015] A first clamping part 22a is screwed onto the tip of one base part 21a, and a first support part 30 is fixed thereto. A second clamping part 22b is screwed onto the tip of the other base part 21b, and a second support part 40 is fixed thereto.

[0016] With this configuration, the first support part 30 and the second support part 40 are disposed opposite each other. The angle at which the first support part 30 and the second support part 40 face each other can be adjusted by changing the relative angle when screwing the pair of clamping parts 22a, 22b to the pair of base parts 21a, 21b.

[0017] The first grip portion 23a is fixed to the first base portion 21a, and the second grip portion 23b is swingably provided on the second base portion 21b. Both ends of a tension coil spring (not shown) are connected to the first grip portion 23a and the second base portion 21b, and the tension coil spring prevents the pair of clamping portions 22a, 22b from approaching each other. This allows the pair of gripping portions 23a, 23b to displace the pair of clamping portions 22a, 22b in a direction toward each other by gripping them so that they approach each other against the elastic force of the tension coil spring.

[0018] 4, connecting rod member 24 is provided so as to be able to swing around central axis 24a provided within second grip portion 23b, and rear end portion 24b is inserted into the internal space of first grip portion 23a. This rear end portion 24b is capable of contacting the tip surface of the shaft portion of rotation operation member 25, which is screwed into first grip portion 23a from the rear end side. Connecting rod member 24 swings around central axis 24a due to a pressing force in the front-rear direction generated in accordance with the amount of screwing of rotation operation member 25 into first grip portion 23a, and the position of tip end portion 24b is displaced in the screwing direction.

[0019] The release member 26 is arranged to be swingable around a swing axis 26a provided in the second grip portion 23b, and one end, the front first end 26b, is located within the second grip portion 23b between the inner surface 23c of the second grip portion 23b and the connecting rod member 24, and the other end, the rear second end 26c, is exposed to the outside from the second grip portion 23b.

[0020] 1, the first support part 30 has a configuration in which a support hole part 31 is provided that penetrates a member having a rectangular plate-like outer shape in the thickness direction. The second support part 40 has a configuration in which a locking part 41 is provided that penetrates a member having a rectangular plate-like outer shape in the thickness direction and is cut out from a front end face 40a, which is the outer edge, toward the center.

[0021] The support hole 31 has a circular shape and penetrates in the thickness direction, and is sized to allow the release bolt 51a (see FIG. 5(a)) of the piggyback 51 to be inserted therethrough. The locking portion 41 has a curved surface portion 41a that conforms to the outer shape of the cylindrical base cylinder 52a of the base 52.

[0022] As shown in FIG. 3(a), the support hole portion 31 and the locking portion 41 are respectively provided at positions corresponding to each other when the first support portion 30 and the second support portion 40 are provided opposite each other in the clamper 20, and these positions are the positions where the straight line L1, on which the central axis AX1 of the piggyback 51 and the central axis AX2 of the base 52 are located, passes when the brake chamber 50 is held.

[0023] The clamper 20 can adjust the swing angle of the connecting rod member 24 by adjusting the amount by which the rotation operation member 25 is screwed into the first grip portion 23a, thereby setting the distance between the first support portion 30 and the second support portion 40. After setting this distance, when the pair of grip portions 23a, 23b are gripped so as to move toward each other against the elastic force of the tension coil spring (not shown), as shown in FIG. 4, the first end 26b of the lock-release member 26 is clamped between the inner surface 23c of the second grip portion 23 and the connecting rod member 24, thereby locking the distance between the first support portion 30 and the second support portion 40. Therefore, by adjusting the amount by which the rotation operation member 25 is screwed into the first grip portion 23a, 23b, the first support portion 30 and the second support portion 40 can be fixed at a desired distance that matches the shape of the brake chamber 50.

[0024] In the above-mentioned locked state, by grasping the release member 26 so as to bring it closer to the second grip portion 23b, the release member 26 swings around the swing axis 26a, causing the first end portion 26b to push the connecting rod member 24 toward the first grip portion 23a, separating the first end portion 26b and the connecting rod member 24 and returning the pair of grip portions 23a, 23b to an open state, thereby releasing the lock.

[0025] Next, disassembly and assembly of the brake chamber will be described with reference to Figures 5 and 6. Figures 5(a) and 5(b) are views showing the configuration of the brake chamber 50, with (a) being an exploded perspective view and (b) being an exploded side view. Figure 6(a) is a perspective view showing the brake chamber holding tool 10 of this embodiment attached to the brake chamber 50, and (b) is a side view showing the configuration of the brake chamber 50 before disassembly and after assembly.

[0026] As shown in FIGS. 5( a ), 5 ( b ) and 6 ( b ), the brake chamber 50 includes a piggyback 51 , a base 52 , a diaphragm 53 and a clamp ring 54 .

[0027] A release bolt 51a is threaded into the piggyback 51 concentrically with the central axis of the cylindrical housing, and the brake can be manually released by rotating the release bolt 51a around its central axis AX1.

[0028] The diaphragm 53 is sandwiched between the housing of the piggyback 51 and a cup 52b at the front end of the base 52. By supplying compressed air between the housing of the piggyback 51 and the diaphragm 53, the diaphragm 53 is deformed, which indirectly pushes a push rod (not shown) provided in a base cylinder 52a at the rear of the base 52, thereby activating the brake.

[0029] The base 52 and the base cylinder 52a, which are formed in a cylindrical shape, have a central axis AX2 that is common with the push rod (not shown) therein.

[0030] The piggyback 51 and the base 52 are arranged so that the central axis AX1 shared by the piggyback 51 and the release bolt 51a and the central axis AX2 of the base 52 are aligned on the same straight line L1, and then the flange portion 51c at the rear end of the piggyback 51 and the cup 52b are fastened and fixed by a clamp ring 54. This fastening is performed by inserting a fastening bolt 54a into a fastening hole 54c of the clamp ring 54 and screwing it into a nut 54b.

[0031] When fixing piggyback 51 and base 52 using clamp ring 54, in order to prevent compressed air from leaking from brake chamber 50 and to ensure normal operation of diaphragm 53, the clamp ring 54 must be fastened while the center axes AX1 and AX2 are accurately positioned on the same straight line L1.

[0032] 6(a), the release bolt 51a of the piggyback 51 is inserted into the support hole 31 of the first support portion 30, the front side surface 51b of the piggyback 51 is brought into contact with the first support portion 30, the curved surface portion 41a of the second support portion 40 is engaged with the base cylinder 52a of the base 52, and the second support portion 40 is brought into contact with the back surface 52c of the cup 52b. With this in mind, the brake chamber holding tool 10 is locked and the clamp ring 54 is tightened. This allows the tightening operation (assembly of the brake chamber 50) to be performed while simply and accurately positioning the central axis AX1 and the central axis AX2 on the straight line L1.

[0033] Similarly, when disassembling the brake chamber 50, the brake chamber holding tool 10 is placed on the brake chamber 50 in a locked state, so that disassembly can be carried out easily and in a short time.

[0034] The following describes a modified example. The first support portion 30 and the second support portion 40 are not limited to the forms of the above-described embodiment. The first support portion 30 may have a shape such as a first support portion 130 shown in FIG. 7(a), which has a semicircular outer shape on the front side and a support hole 131 penetrating in the thickness direction. Such an outer shape can also be applied to the second support portion 40.

[0035] Furthermore, the second support part 40 may have an overall disk-shaped outer shape, for example, as shown in Fig. 7(b), with a locking part 141 that penetrates in the thickness direction and is cut out from the outer edge toward the center, as in the second support part 140. Such a shape can also be applied to the first support part 30. Furthermore, instead of a disk shape, an elliptical plate shape or a polygonal plate shape may be used.

[0036] Furthermore, in the above embodiment, the first support portion 30 and the second support portion 40 are flat plate-shaped, but they may be shaped other than plate-shaped as long as they each have a support hole portion 31 through which the release bolt 51a can be inserted and a locking portion 41 that can be locked to the base cylinder 52a. Although the present invention has been described with reference to the above-mentioned embodiments, the present invention is not limited to the above-mentioned embodiments, and improvements or modifications can be made within the scope of the invention or the concept thereof. [Explanation of symbols]

[0037] 10 Brake chamber holding tool 20 Clamper 21a 1st base 21b 2nd base 22a First clamping part 22b Second clamping part 23a First grip part 23b Second grip part 23c Inside 24 Connecting rod member 24a Center axis 24b Tip 25 Rotation operating member 26 Unlocking member 26a Oscillating shaft 26b 1st end 26c 2nd end 30, 130 1st support part 31, 131 Support hole 40, 140 Second support part 40a Front end surface 41, 141 Locking part 41a Curved part 50 brake chamber 51 Piggyback 51a Release bolt 51b Front side 51c Flange 52 base 52a Base Cylinder 52b cup 52c back 53 Diaphragm 54 Clamp ring AX1, AX2 center axis

Claims

1. A brake chamber holding tool comprising two clamping portions facing each other and a grip portion that allows the distance between the two clamping portions to be changed and the clamping portions to be fixed at a desired distance, wherein a first support portion is provided on one of the two clamping portions and a second support portion is provided on the other clamping portion, the first support portion includes a support hole portion, and a release bolt inserted into the support hole portion can be inserted into the support hole portion, the release bolt being inserted into a piggyback of the brake chamber; the second support portion includes a locking portion that can be locked to a base cylinder extending from a base of the brake chamber, A brake chamber holding tool characterized in that by inserting the release bolt into the support hole portion and engaging the locking portion with the base cylinder, the central axis of the release bolt and the central axis of the base cylinder are positioned on the same straight line, and the first support portion and the second support portion support the brake chamber from both sides of the straight line.

2. The brake chamber holding tool according to claim 1 , wherein the first support portion is flat, the support hole portion penetrates the first support portion in a thickness direction, and the release bolt is inserted into the support hole portion.

3. The brake chamber holding tool according to claim 2, wherein the second support portion is flat, and the locking portion is cut out from an outer edge of the second support portion to a center thereof and penetrates the second support portion in a thickness direction.

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