JPH0142652Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to an improvement of a connection device for operating wires in a vehicle brake device or the like.

Conventionally, as an example of this type of device, the bottom of a substantially U-shaped connecting fitting is engaged with an end stopper of an operating wire, and a pin extending between opposing side pieces of the fitting is inserted into a groove in an operated member. Some wires are hooked to transmit the pulling force of the operating wire to the operated member.

When connecting the connecting fitting to the operated member, this connection device is extremely easy to work with because all you have to do is hook the pin into the groove of the operated member, but on the other hand, the pin may easily come off from the groove of the operated member. There were some shortcomings.
For example, when the pulling force of the operating wire is released, if the operating wire or the wire and the connecting fitting return together before the operated member, the terminal of the operating wire will be along the back of the operated member and the connecting fitting As a result, the pin may come off the groove of the operated member or damage rubber parts installed near the connecting fitting.

The present invention aims to solve the above-mentioned problems by providing a stopper at the connecting part of the operated member to directly or indirectly limit the rotation of the connecting fitting about the pin as a fulcrum. .

A detailed explanation will be given below with reference to the drawings. Figures 1 and 2 show the main parts of a conventional parking brake device for drum brakes used in vehicles, etc.
Reference numerals 1 and 2 denote a pair of brake shoes disposed facing each other in a brake drum (not shown); 3 a back plate movably supporting the shoes 1 and 2; and 4.
is a strut extending between a pair of brake shoes 1 and 2, and a groove 4a formed at one end of the strut engages one brake shoe 1, and a finger of a bell crank lever 5 pivotally supported on the other. shaped part 5a
is engaged with the window hole 2b of the other brake shoe 2. Note that the other strut 4 may engage directly with the brake shoe 2 without using the bell crank lever 5, so the brake drum (not shown) and the linings 1a of the brake shoes 1, 2,
A description of the bell crank lever 5, which has a function of automatically adjusting the gap with the bell crank lever 2a, will be omitted.

Reference numeral 6 denotes an operating lever which is an operated member whose intermediate portion is rotatably supported by a pin 7 on one of the extension portions 4b of the strut 4, and one arm 6a of the lever 6.
is engaged with the window hole 1b of one brake shoe 1, and the other arm 6b passes through the window hole 3a of the back plate 3 in a loosely fitted state and extends to the outside of the brake. A substantially U-shaped groove 6c is formed in the other arm 6b of the operating lever 6, and a protruding end 6e protruding in the opening direction of the groove 6c comes into contact with a bracket 11 fixed to the back plate 3. The return position when the brake is released is regulated.

Reference numeral 8 denotes a substantially U-shaped connection fitting, through which an operating wire 9 for remote transmission is inserted through a hole 8b provided at the bottom 8a of the fitting 8, and an end stopper 9a fixed to the end of the wire 9 is connected to the It abuts against the bottom portion 8a. Normally, the terminal stopper 9a is crimped by inserting the operating wire 9 into the hole 8b of the connecting fitting 8 and with the terminal portion 9b protruding from the connecting fitting 8. Also, opposing side pieces 8c from both sides of the bottom 8a of the connection fitting 8,
8'c is bent, and these side pieces 8c,
A pin 10 is extended rotatably or non-rotatably so as to connect the opening sides of 8'c. Therefore, the pin 10 is inserted into the groove 6c of the operating lever 6 so that the hook-shaped connecting portion 6d forming the groove 6c of the operating lever 6 is disposed between the terminal portion 9b of the operating wire 9 and the pin 10. The operating wire 9 and the operating lever 6 are connected by hooking. 12 is a dust boot that covers the window hole 3a, and 13 is a boot clip.
The other end of the operating wire 9 is appropriately connected to a parking lever inside the vehicle interior.

Now, when the operating wire 9 is pulled in the direction of arrow A in FIG. is pressed against a brake drum (not shown), and the pressure is transmitted to the other brake shoe 2 via the pin 7, strut 4 and bell crank lever 5, pressing the lining 2a against the brake drum, thereby causing the brake Slow down the rotation of the drum or keep it stationary.

Also, when the pulling force of the operating wire 9 is released,
Each part is restored to its original state by means of a spring (not shown) stretched between the brake shoes 1 and 2, etc., but the sliding movement between the back plate 3 and the brake shoes 1 and 2 If abrasion powder or mud from the linings 1a, 2a adheres to the surface or the pivot portion of the operating lever 6, or if rust develops, the resistance of these parts increases, making it difficult for the operating lever 6 to return. If the operating wire 9 is forcibly returned in this state, the operating wire 9 and the connecting fitting 8 will return before the operating lever 6, causing slack in the operating wire 9. For example, as shown by the dashed line, the terminal of the operating wire 9 The portion 9b is the operating lever 6
The terminal of the operating wire 9 and the connecting fitting 8 rotate together using the pin 10 as a fulcrum, and the pin 10 comes off from the groove 6c of the operating lever 6, making it impossible to operate the brake. There was a danger of becoming Further, when the connecting fitting 8 rotates in the opposite direction, the dust boot 12 is damaged at the edge portion of the fitting 8, causing muddy water and dust to enter the brake from the damaged portion.

The present invention was made to solve the above-mentioned problems, and the embodiments thereof are shown in Figs. 3 to 5 below.
This will be explained using figures. The same components as those in the conventional example described above are designated by the same reference numerals, and in each embodiment, the state when the operating wire moves relative to the connecting part of the operating lever in the return direction during non-operation is shown. There is.

FIG. 3 shows an embodiment of the present invention, which is applied to a device in which the terminal portion 9b of the operating wire 9 protrudes from the terminal stopper 9a. This is an indirect restriction.

That is, stoppers S and S' are provided that protrude from the back surface of the operating lever 6 so as to be located on both sides of the protruding end portion 9b. Therefore, the operating wire 9 is moved back and the terminal stopper 9a is connected to the operating lever 6.
When the operating wire 9 starts to slacken, its terminal portion 9b contacts the stopper S or S', and due to the two-point support between the corresponding contact portion and the pin 10, the operating wire 9 is pulled against the connecting portion 6d. Terminal section 9
b and the connecting fitting 8 are restricted, and the pin 10 may come off from the groove 6c as in the conventional case, or the dust boot 1 may
There is no risk of damaging second-class soft parts.

FIG. 4 shows a modification of the present invention shown in FIG. 3, which is applied to a device in which the end portion of the operating wire 9 is embedded in the end stopper 9a. In this case, if the stoppers S and S' are protruded from the back surface of the operating lever 6 so as to be located on both sides of the end stopper 9a, the same effect as in the above embodiment can be obtained.

FIG. 5 shows another embodiment of the present invention, in which the rotation of the connecting fitting 8 with respect to the connecting portion 6d of the operating lever 6 is directly restricted. That is, a U-shaped notch is made in at least one of the side pieces 8c and 8'c of the connecting fitting 8, and a diagonally bent locking claw 8d is made to stand up, and the end of the locking claw 8d is connected to the operating lever. 6, and is located at an intermediate portion between stoppers S and S'.

With the above configuration, the operating wire 9 and the connecting fitting 8 return together before the operating lever 6, and the tip of the locking claw 8d comes into contact with the back surface of the operating lever 6.
Even if the operating wire 9 becomes slack and begins to bend, the locking pawl 8d contacts the stopper S or S' and the rotation of the connecting fitting 8 is restricted, so that the same effect as in the embodiment described above can be obtained.

Note that the present invention is not limited to the above-mentioned embodiment, and for example, if there is no dust boot 12 etc. near the connection fitting 8, one stopper
S' may be removed, or a stopper S or a member corresponding to S' may be added.

As is clear from the above description, according to the present invention, it is extremely easy to attach and detach the connecting fitting, which is a part of the operating member, to the operating lever, which is the operated member. It is possible to reliably prevent the connection fitting from coming off, and to avoid interference with other parts of the connection fitting.
Furthermore, when the operating wire begins to bend, its self-resilient force acts as a force for returning the operating lever, which is of great practical benefit.

[Brief explanation of the drawing]

FIG. 1 is a longitudinal sectional view showing a conventional parking brake device for a drum brake, FIG. 2 is a view taken along the Y arrow in FIG. 4 is a longitudinal sectional view showing a modified example of FIG. 3, FIG. 5 A is a plan view showing another embodiment of the operating wire connection part according to the present invention, and FIG. be. DESCRIPTION OF SYMBOLS 1, 2... Brake shoe, 3... Back plate, 4... Strut, 6... Operation lever which is an operated member, 6c... Groove, 6d... Connection portion, 8
...Connection fittings, 8a...Bottom, 8c, 8'c...
Side piece, 8d... Locking claw, 9... Operation wire, 9a
...Terminal stopper, 10...pin, S, S'...stopper.

Claims (1)

[Scope of utility model registration request] The bottom of the approximately U-shaped connecting fitting is engaged with the terminal stopper of the operating wire, and the pin extending between the opposing sides of the fitting is hooked into the groove of the operated member to apply the operating force of the operating wire. In a connection device for an operating wire connected to transmit data to an operated member, when the operating wire moves relative to the connecting portion of the operated member in a return direction when not operated, the connection is made using the pin as a fulcrum. An operation wire connection device, characterized in that a stopper for restricting rotation of the bottom side of the metal fitting is provided at the connection portion of the operated member.