JPH0135952Y2 - - Google Patents

Description

[Detailed Description of the Invention] This invention relates to an attachment/detachment tool that facilitates attachment and detachment of a return spring in an automobile wheel brake.

When the brake shoe in an automobile wheel brake is operated, the end of the brake shoe is pressed by the oil cylinder and expands inwardly, causing the lining provided on the surface of the rim of the brake shoe to come into contact with the inner peripheral surface of the drum. It is configured to brake the rotation of the wheels by friction due to strong mutual pressure. However, the return of the expanded brake shoe at the end of the brake operation is controlled by a coiled spring, that is, a return spring. In wheel brakes for large vehicles, two return springs are installed in parallel inside the web of a brake shoe that has two webs, and the initial tension is 30Kgf to 50Kgf even when the brake is not in operation. It is normal to have Therefore, it is difficult to attach and detach the return spring simply by hand, and the use of an attachment/detachment tool is essential. There is no conventional attachment/detachment tool that can simultaneously attach two return springs installed in parallel, and the attachment work has been performed twice for each return spring. Also, in the case where two return springs can be installed in one operation, the third
As shown in the figure, a cylindrical guide pipe is connected to the hook at the end of the return spring to form two return springs, and a detachable tool is hooked onto this guide pipe and pulled to release the locking pin. It was formed to fit through and be installed. This type was always fitted with an unnecessary guide pipe. This invention provides a return spring attachment/detachment tool that is unprecedented in the prior art, which can simultaneously attach and detach two return springs attached to a shoe with a two-web structure in one operation, and does not require a guide pipe. The purpose is to

This invention will be explained in detail based on illustrated embodiments.

FIG. 1 is a partially cutaway side view of the wheel brake, and FIG. 2 is an enlarged cross-sectional explanatory view of a portion where a return spring is attached. In the figure, 1 is a brake shoe in a wheel brake, 2 and 3 are each web in a brake shoe with a two-web structure, 4,
5 is a return spring installed in parallel; 6 is a locking pin that locks the return spring; 7 is a locking pin that locks the return spring;
is an oil cylinder for expanding the inside of the brake shoe, 8
is the lining. Return spring 4, 5
are arc-shaped hook parts 42, 52 formed at both end edges of the coil-shaped spring body parts 41, 51.
on the inner surfaces of the two webs 2 and 3 of shoe 1,
They are hooked and mounted in parallel on a locking pin 6 that is fitted and locked with a slight loose fit in a through hole provided on the same axis near the edge thereof. Therefore, the return spring attachment/detachment tool 1 according to this invention
0 is a locking piece portion 20 that locks the attachment/detachment tool 10 between the webs 2 and 3, as shown in FIGS. 4 and 5.
The rotating piece part 30 that controls the rotating part, the head piece part 40 into which the arcuate edge parts of the hook parts 42 and 52 of the return springs 4 and 5 are fitted, and the locking piece part 20 and the rotating piece part 30 are connected. It is composed of a square tube pin part 50 that transmits rotational force to the rotating piece part 30. The locking piece portion 20 is formed by penetrating the locking hole portion 202 and the coupling hole portion 203 on the central axis near both end edges of the locking piece main body portion 201 formed in the shape of a rectangular width plate. . The locking hole portion 202 is connected to the web 2 of the shoe 1,
The connecting hole 202 and the connecting hole 203 are formed to have the same diameter as the guide hole 9 provided through the attachment/detachment tool 10, and the indirect distance between the locking hole portion 202 and the coupling hole portion 203 is determined as appropriate depending on the type of wheel brake in which this attachment/detachment tool 10 is used. The rotating piece portion 30 is
A rotary piece main body part 301 formed of a rectangular width plate having the same width as the locking piece part 20 and a large plate thickness is provided, and a through groove part 302 that opens at the end face of one of the short sides thereof is provided. . The through groove portion 30
2 is formed into a groove width into which the locking piece 20 can be inserted and freely moved. At the same time, the coupling hole 20 of the locking piece 20
A through hole portion 303 having the same diameter as that of the through hole portion 303 is formed by penetrating both walls of the central portion of the through groove portion 302 . The head piece 40 has the same width as the rotating piece main body 301, and has a thickness sufficient to allow the return springs 4 and 5 to be arranged in parallel and to allow the arcuate edges of the hook parts 42 and 52 to be attached. A head piece main body portion 401 is provided,
A relief part 402, a groove part 403, and an upright wall part 404 are provided on one end surface of the width part of the head piece main body part 401 along the thickness direction. The bottom of this groove 403 is formed to be on the center line of the width of the head piece main body 401, and the groove width is the same as that of the return spring 4,
The arcuate end portions of the hook portions 42 and 52 of No. 5 are formed to have a width that allows a slight loose fit. Further, the rising height of the standing wall portion 404 is set to a height that allows the arcuate end portions of the hook portions 42 and 52 to be locked. Furthermore, the relief part 402
is from the edge of the opposite side of the vertical wall portion 404 to the groove portion 40
3, and the center of the groove is located closer to the vertical wall portion 404 than the center of the plate thickness. In other words, the width of the vertical wall portion 404 is such that the hook portion 42 and
When the arcuate edge portion 52 comes, it is sufficient to form it with sufficient strength and minimum width. The head piece 40 is fixed to an end face of the rotary piece body 30 of the rotary piece body 301 opposite to the end face where the through groove 302 opens, with a vertical wall portion 404 positioned outward. In addition, the square tube pin portion 50 is formed of a polygonal tube such as a quadrangle, hexagon, or octagon that can apply rotational force,
Its diagonal length is determined to allow smooth rotation within the coupling hole 203 of the locking piece 20. Then, the side end portion of the locking piece portion 20 in which the coupling hole portion 203 is bored is inserted into the through groove portion 302 of the rotating piece portion 30, and the coupling hole portion 203 and the through hole portion 303 of the rotating piece portion 30 are overlapped. , In this state, insert the square tube pin part 50.
The length of this square cylinder pin 50 is set to a length that allows it to rotate freely between the inner surfaces of the webs 2 and 3. After the square cylinder pin part 50 is inserted, it is fixed by welding to both walls of the through groove part 302 of the rotary piece part 30. In this state, the rotating piece 30 can smoothly rotate around the coupling hole 203 of the locking piece 20.

Next, the operating procedure of this attachment/detachment tool 10 will be explained. First, with the groove 403 of the head piece 40 facing the shoe 1, the locking piece 20 of the attachment/detachment tool 10 is inserted between the inner surfaces of the webs 2 and 3, and the locking hole 202 is inserted between the inner surfaces of the webs 2 and 3. It is overlapped with the guide hole 9 and the pin is inserted and locked. Next, the arcuate edges of the hook portions 42 and 52 of the return springs 4 and 5 are fitted in parallel into the groove portion 403 of the head piece 40, and in this state, the square tube pin portion 50 is inserted into the square tube pin portion 50. Insert a wrench with a square head that fits slightly into the inner surface of the
As shown by the chain line in FIG.
When the arcuate centers of 2 and 52 overlap with the fitting hole of the locking pin 6, the locking pin 6 is inserted. In this state, the hook portions 42 and 52 are already attached to the web 2 of the shoe 1,
It is in a state where it is multiplied by 3. After that, the rotating piece part 3
0 in the opposite direction, the hook parts 42 and 52 are removed, and then the pin of the locking piece part 20 is pulled out and the attachment/detachment tool 10 is taken out. When removing the return springs 4, 5 that have already been installed, the above procedure can be performed in reverse.

Next, a second embodiment will be described.

The locking piece 20 in the first embodiment is integrally formed, and the spacing between the locking hole 202 and the coupling hole 203 is constant to match a specific model of wheel brake. In the second embodiment,
This spacing is made adjustable so that it can be applied to several types of machines of different sizes. That is, the sixth
As shown in the figure, the locking piece 200 is connected to the locking portion 200.
1 and the adjustment section 2002 are formed as separate bodies, and the connection interval between the two is formed to be expandable and contractible. In the illustrated embodiment, threads 3001 and 3002 have opposite directions.
A connecting rod 3000 is provided on both sides, and a screw hole portion 20 is screwed into the screw portions 3001 and 3002.
03 and 2004 are provided on each locking piece 2001 and adjustment piece 2002 and screwed together to connect the connecting rod 3000.
It is formed so that the connection interval between the two can be expanded or contracted by rotating.

This invention is constructed as claimed in the utility model registration claim based on the above-mentioned embodiment, so that it is possible to install the return spring provided in the sub-row with a single operation, and the guide pipe as seen in the conventional example. becomes unnecessary. Furthermore, it is possible to provide a practical return spring attachment/detachment tool that reduces vehicle weight and avoids unnecessary use of materials. at the same time,
The attachment/detachment tool itself has a simple structure and is easy to operate, making it possible to provide an auxiliary tool that does not require skill and solves the current problem of high work efficiency.

[Brief explanation of drawings]

Fig. 1 is a side view of the wheel brake with a part removed, Fig. 2 is an enlarged cross-sectional view of the mounting part of the return spring, Fig. 3 is a cross-sectional view of the mounting part in the conventional example, and Fig. 4 is a cross-sectional view of the mounting part of the return spring. FIG. 5 is an explanatory diagram of the attaching/detaching device according to the invention, FIG. 6 is a plan view thereof, and FIG. 7 is a front view showing the second embodiment with a part cut away. It is a diagram. Explanation of symbols, 1... Brake shoe, 2, 3...
...Web, 4, 5...Return spring, 6...
... Locking pin, 7 ... Oil cylinder, 8 ... Lining, 9 ... Guide hole, 10 ... Attachment/detaching tool, 20
... Locking piece part, 30 ... Rotating piece part, 40 ... Head piece part, 41, 51 ... Spring body part, 42, 5
2...Hook part, 50...Square cylinder pin part, 200...
...Locking piece part, 201...Locking piece main body part, 202...
... Locking hole section, 203 ... Connection hole section, 301 ... Rotating body main body section, 302 ... Penetration groove section, 303 ... Through hole section, 401 ... Head piece main body section, 402 ... Relief section, 403 ... ...Groove section, 404... Standing wall section, 200
1... Locking part, 2002... Adjustment part, 2003,
2004...Screw hole part, 3000...Connecting rod, 3
001,3002...Screw part.

Claims (1)

[Claims for Utility Model Registration] (1) It has a locking hole portion 202 that is inserted between the inner surfaces of the two webs 2 and 3 and overlaps with the guide hole 9 of the webs 2 and 3 to be connected with a pin. Connection hole 20 on the other side
The locking piece 20 is rotatably connected to the locking piece 20 by a square cylinder pin part 50 that can rotate and slide on the inner peripheral surface of the coupling hole 203. , and a rotating piece portion 30 that integrally fixes the end edge of the square cylinder pin 50, and the rotating piece portion 3.
a groove 403 that is integrally formed on the edge of the spring 0 and has a groove width capable of locking the edge of the hook portions 42, 52 of the sub-row return springs 4, 5;
A tool for attaching and detaching a return spring in a wheel brake, characterized by comprising a relief portion 402 forming a 03 and a head portion 40 provided with a vertical wall portion 404. (2) A lock in which the locking piece 20 is formed as separate parts of a locking part 2001 having a locking hole 202 and an adjusting part 2002 having a coupling hole 203, and the two are combined so that the connecting interval between them can be adjusted. The attachment/detachment tool for a return spring in a wheel brake according to claim 1, characterized in that it is formed of a piece 200.