JPH0211445A - Device for operating stick type parking brake - Google Patents

Abstract

PURPOSE:To prevent the erroneous releasing of a parking brake by pushing in the button of an operating device in the operating condition of a parking brake and, after slightly drawing a handle toward an operator, releasing the drawing force in a condition of pressing the button, to release the operating condition of the parking brake. CONSTITUTION:At the time of operating a parking, a handle 14 is drawn toward an operator to move an operating frame 15 rightward via an operating rod 13, thereby drawing a brake wire via an oscillated lever 19. A ratchet pawl 23 is engaged with a ratchet tooth 22 in a position corresponding to the drawing quantity of the handle, to stop the handle 14 in the drawn near position. Next, in order to release a parking brake condition, the handle 14 is slightly drawn near while pushing in a button 26 and, then the drawing force is released. By this operation, the ratchet pawl 23 is released from the ratchet tooth 22 via a release block 28 by the energizing force of a spring 29, to return the lever 19 to its original position.

Description

DETAILED DESCRIPTION OF THE INVENTION a. Field of Industrial Application The present invention relates to an operating device for a stick-type parking brake.

b. Conventional technology Passenger cars often employ stick-type parking brakes. FIGS. 3 and 4 show a typical operating device for such a stick-type parking brake.

In this operating device, a bracket 1 is installed on a vehicle body frame or the like, and a handle 2 is arranged below an instrument panel. One end of an operating rod 3 is fixed to the handle 2. The operating rod 3 is slidably disposed on a guide frame 4, and the guide frame 4 is held by the bracket 1. The other end of the operating rod 3 is rotatably connected to a lever 5. This lever 5
is swingably supported by the bracket 1, and one end of a brake wire 6 is locked near the fulcrum of the lever 5. Therefore, when the handle 2 is pulled toward you, the operating rod 3 is pulled out together with the handle 2, and the lever 5 is moved to the third position.
In the figure, it is swung in the direction of the arrow, thereby pulling the brake wire 6 and operating a brake shoe (not shown) to perform a braking action.

Further, as shown in an enlarged view in FIG. 4, ratchet teeth 7 are formed on the operating rod 3 along the generatrix of the peripheral surface, while ratchet pawls 8 are arranged on the guide frame 4. There is. Therefore, the pulled-out operation rod 3 has its ratchet teeth 7 engaged with the ratchet pawls 8, and is locked in the pulled-out position.

To release the above brake action, first turn the handle 2 to 4
Rotate about 5 degrees to release the ratchet teeth 7 from the ratchet pawls 8. Then, the operating rod 3 is returned together with the lever 5 by the biasing force of a spring (not shown).

C9 Problems to be Solved by the Invention As described above, in the conventional stick-type parking brake, when the parking brake is activated, the brake operation can be released by simply rotating the handle 2. This is undesirable because if a human body, object, etc. accidentally touches the handle 2 and rotates the handle 2 while the parking brake is in operation, the brake operation will be released.

SUMMARY OF THE INVENTION An object of the present invention is to provide a stick-type parking brake operating device that can be operated reliably without releasing the brake even if the brake handle is accidentally touched.

d. Means for Solving the Problems In the stick-type parking brake operating device of the present invention, a rod-shaped guide having ratchet teeth on the circumferential surface and held at one end by a bracket, and a lever to which a brake wire is engaged are operated. an operating frame that is held by the bracket and slidably fitted to the rod-shaped guide; a handle at one end; one end slidably supported by the guide frame held by the bracket; the other end; a pipe-shaped operating rod that is locked to the operating frame; a ratchet pawl that is rotatably supported by the operating frame and is biased by a spring and meshes with the ratchet teeth; and a ratchet pawl that penetrates into the operating rod. The handle includes a lock release rod inserted into the handle and having a push button at one end, and a lock release block disposed at the other end of the lock release rod via a lock release spring and engaged with the ratchet pawl. By pulling out, the lever is actuated via the operating rod and the operating frame, thereby pulling the brake wire in the direction of brake operation, and locking the ratchet pawl at an appropriate position of the ratchet tooth of the rod-shaped guide. By locking the lever and operating the push button, the lock release spring is connected to the lock release spring via the lock release rod.
By accumulating a biasing force in a direction in which the ratchet pawl moves away from the ratchet teeth and further pulling out the handle, the ratchet pawl and the ratchet teeth are separated from each other in cooperation with the biasing force of the spring. That's what I do.

e. Function: In the cane-type parking brake operating device of the present invention, the brake is activated by pulling the cane toward you, pressing the button of the operation device that is in the brake activation state, and pulling the cane slightly toward you. ,continue,
The brake activation state is released by releasing the force of pulling the handle while pressing the button.

f. Embodiment FIGS. 1 and 2 show an operating device for a stick-type parking brake according to the present invention.

This operating device 10 is attached to a vehicle body frame or the like with a bracket 11, and is disposed below an instrument panel.

In this operating device 10, a rod-shaped guide 12 and a pipe-shaped operating rod 13 are arranged in parallel. The operating rod 13 has a handle 14 at one end and an operating frame 15 at the other end.
It is equipped with This operating rod 13 has one end that is
It is slidably held by a guide frame 16, and the guide frame 16 is supported by the bracket 11 by a pin 17. On the other hand, the operating frame 15 is held by a pin 18 to a lever 19, which is supported on the bracket 11 by a pin 20, as shown in FIG. One end of a brake wire 21 is locked to this lever 19 .

The rod-shaped guide 12 has one end supported by the bracket 11 by the bin 17 and the other end slidably held by the operating frame 15. Further, this rod-shaped guide 12 has ratchet teeth 22 on its peripheral surface, and a ratchet pawl 23 that engages with the ratchet teeth 22 is supported by the operating frame 15 by the pin 18 described above. The ratchet pawl 23 is pressed against the ratchet teeth 22 by a torsion coil spring 24 wound around the pin 18. Further, a lock release rod 25 is inserted through the operating rod 13. A push button 26 is fixed to one end of the lock release rod 25, and a lock release block 28 is slidably disposed at the other end.

This lock release rod 25 is biased to the right in FIG. 2 by a compression spring 27 disposed between a claw 13a formed by folding a part of the operating rod 13 inward and an end surface 26a of the push button 26. , and rightward movement is restricted by a stopper 25a formed at the end. The lock release block 28 is biased to the left in FIG. 2 by a compression spring 29 disposed between one end surface 28a and a stopper 25b formed on the lock release rod 25, and the other end surface 28b is biased to the left by a ratchet. It is arranged in contact with or close to the claw 23.

The operation of the stick-type parking brake operating device 10 described above will be explained below.

1 and 2 show the parking brake in a non-operating state. In this state, the handle 14 is in a pushed-in state and the end surface of the handle 14 is in contact with the guide frame 16. In this state, the operating frame 15 is located at the leftmost position in FIG. 2, and the lever 19 and ratchet pawl 23 are
It is also located on the far left.

When the handle 14 is pulled toward you (to the right in Figure 2) to operate the parking brake, the operating rod 1
3, the operating frame 15 is moved to the right in FIG. Therefore, the lever 19 is swung in the direction of the arrow in FIG. 1, pulling the brake wire 21 and operating a brake shoe (not shown). Meanwhile, the ratchet pawl 23 moves over the ratchet teeth 22 and the handle 14
It engages with the ratchet teeth 22 at a position corresponding to the amount of pulling. Therefore, even if the handle 14 is released, the handle 14 is stopped in the drawn position and remains there. That is, the brake operating state is maintained.

To cancel this brake activation state, press button 2.
6, pull the handle 14 slightly, and then, while keeping the button 26 pressed in, pull the handle 14.
All you have to do is relax the force that is pulling you.

That is, when the button 26 is pushed into the handle 14, the lock release rod 25 is also moved in the direction of the lever 19, but since the ratchet pawl 23 is strongly engaged with the ratchet teeth 22, the lock release block 28 is not moved. The compression spring 29 is therefore in a deflected state. If the handle 14 is pulled slightly, the engagement between the ratchet pawl 23 and the ratchet teeth 22 becomes weaker, so the ratchet pawl 23 is released from the ratchet teeth 22 via the lock release block 28 by the biasing force of the compression spring 29. be done.

Therefore, if the force pulling the handle 14 is relaxed or the handle 14 is pushed in, the lever 19 will be returned to its original position and the brake operation will be released.

The operation to release the above brake operating state is as follows:
The button 26 may be pressed after first pulling the handle 14 slightly toward the user.

g. Effects of the Invention As described above, in the stick-type parking brake operating device according to the present invention, in order to release the brake operating state, there are two actions: operating the push button and pulling the handle toward you. This is necessary, and there is no risk of the brake activation being released even if a body or object accidentally touches the handle, and there is no need to rotate the handle.
The operating space is small, and furthermore, even when the handle is rotated, the relative positions of the ratchet teeth and ratchet pawls do not change, so a stable engagement relationship is always achieved and a reliable locking state is achieved.

[Brief explanation of the drawing]

1 and 2 show a stick type parking brake operating device according to the present invention, FIG. 1 is an overall perspective view of the device, FIG. 2 is a sectional view of the main part of the device,
3 and 4 show a conventional stick-type parking brake operating device, with FIG. 3 being a perspective view of the device, and FIG. 4 being a sectional view of a main part thereof. DESCRIPTION OF SYMBOLS 10... Operating device, 12... Rod-shaped guide, 14... Handle, 16... Guide frame, 21... Brake wire, 23... Ratchet pawl, 25... Lock release rod, 26 ...Push button, 2nd...Lock release block, 29...Compression spring. DESCRIPTION OF SYMBOLS 11... Bracket, 13... Operating rod, 15... Operating frame, 19... Lever 22... Ratchet tooth, Fig. 1

Claims (1)

[Claims] A rod-shaped guide having ratchet teeth on its peripheral surface and held at one end by the bracket, and an actuation frame which is held by the bracket via a lever that locks a brake wire and is slidably fitted into the rod-shaped guide. a pipe-shaped operating rod having a handle at one end, one end slidably supported by a guide frame held by a bracket, and the other end being locked to the operating frame; a ratchet pawl that is movably supported and biased by a spring and meshes with the ratchet teeth; a lock release rod that is inserted into the operating rod and has a push button at one end; and the other end of the lock release rod. a lock release block disposed through a lock release spring and engaged with the ratchet pawl, and by pulling out the handle, actuating the lever via the operating rod and the operating frame; By pulling the brake wire in the direction of brake operation, locking the lever by locking the ratchet pawl at an appropriate position of the ratchet tooth of the rod-shaped guide, and operating the push button, the lever is released via the lock release rod. By accumulating a biasing force in the direction in which the ratchet pawl moves away from the ratchet teeth in the lock release spring, and by further pulling out the handle, the ratchet pawl and A cane-type parking brake operating device, characterized in that the ratchet teeth are separated.