JPS6341250Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a parking brake safety device for an automobile, and more particularly to an improved two-operation release stick-type parking brake operating handle.

In the stick-type parking brake,
If a limb or object happens to touch the operating handle while the vehicle is parked and you push or turn the handle,
There was a risk that the parking brake would be released against the driver's will, so in order to prevent such an accident, two different types of brake release actions (for example, turning and pulling the steering wheel) were required. A so-called two-operation release stick-type parking brake is known.

This type of two-operation release stick-type parking brake has a stick-shaped operating rod for pulling the parking brake wire and a fixed guide tube for guiding the linear movement of the operating rod. A series of rack teeth is provided along the axial direction of a portion of the upper surface of the operating rod, and the fixed guide tube has a non-return pawl that engages with the rack teeth of the operating rod to hold the operating rod in a certain pulled position, and the parking brake is held in the position in which the operating rod is pulled. When releasing the brake, the handle of the stick-type brake operating rod is pulled with the reaction force of the brake wire or a force greater than this to loosen the engagement between the check pawl and the rack teeth, or with the handle pulled even further, the handle is rotated in a specified direction to rotate the rack teeth of the operating rod onto a side line where the check pawl does not engage with the check pawl, and then the operating rod is extended forward under the influence of the brake reaction force, and in the final stage of brake release, the operating rod rotates back onto the side line where the check pawl is located. This is configured so that a pin previously provided on the operating rod and the long groove of the guide tube interact with each other.

The present invention is designed to prevent, in this type of stick-type parking brake, even if the handle is pushed or turned by an unexpected external force while the brake is being tightened, the tightening state of the brake will not be affected. This relates to safety equipment to prevent accidents.

The present applicant has filed a patent application filed on October 17, 1972.
In the specification of No. 132856 (Japanese Unexamined Patent Publication No. 56-57543) ``Operating Device for Stick-type Parking Brake'', we proposed a handle structure for a stick-type parking brake that includes a safety device for the above purpose. To briefly explain how it works, the stick-type parking brake has an operating lever and an operating handle that is slidably attached to the end of the lever via a compression spring, and is fixed to the handle. cam surface and
Due to the interaction between the cam follower pin fixed to the end of the operating rod and the compression spring, the parking brake cannot be released simply by pushing or rotating the handle; The handle would return to its original state.

The stick-type parking brake safety device according to the present invention is similar in principle to the one described in the above patent application filed by the present applicant, but its structure is more compact and the components are further simplified. It is also easy to manufacture.

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the accompanying drawings.

FIG. 1 is a sectional view showing the safety device of the parking brake operating handle according to the present invention,
A cylindrical member 2 is integrally fixed to the inside of the handle 1 by a rod or a plate 3 passing through the handle 1, and other flange parts (not shown). The seat plate 6 is slidably fitted into the bottom of the cylindrical member 2 (the illustration shows a seat plate 6 that is crimped to the fixing penetrating plate 3, but the cylindrical member 2
(which may be an integral bottom part), a compression spring 7 is interposed between the bottom part and the bottom part. The cylindrical member 2 has a substantially triangular opening 8 with rounded corners as shown in the uncut portion on the left side of FIG. A short columnar pin 9 is erected on the side of the operating rod 4 by press-fitting or the like. Therefore, the pin 9 on the operating rod 4 and the opening 8 of the cylindrical member 2 are fixed when the handle 1 is rotated clockwise or counterclockwise with respect to the operating rod 4 from the position shown in FIG. Either of the inclined surfaces 10, 10' of the opening 8 performs a cam action with respect to the pin 9 in the state,
The cylindrical member 2 and the handle 1 integral therewith are moved to the left in FIG. 1 (in the direction of arrow A) against the force of the spring 7.

In other words, the handle 1 may be damaged by an unexpected external force.
The compression of the compression spring 7 and the opening 8 of the cylindrical member do not affect the brake lock state (not shown) of the operating rod 4 even if the lever is pushed or twisted.
It can be seen that the parking brake is safely held in the locked position by the camming action of the lever and pin 9 of the operating rod. In this state, when the unexpected external force is removed, the handle 1 moves in the direction of arrow B and returns to its normal position (FIG. 1). The cam action returns the cylindrical member 2 and thus the handle 1 to the position shown in FIG.

As described above, in the present invention, the cam-operating mechanism, that is, the combination of the opening 8 and the pin 9, is provided inside the shaft portion 11 of the handle 1. -132856) is more compact overall than the one in which the combination of the opening and the pin is built into the handle portion 12 of the handle, and the mechanism can also be simplified.

FIG. 2 is an enlarged view showing only the portion related to the cam operation in FIG.
is shown expanded in a plane. The opening 8 shown in FIG.
The cam surface 10 is shown as an open groove having a cam surface 10 that presses against the cam surface 10, and the cam surface 10 is formed into a suitable bent line or broken line shape as shown in the illustration. The bent line 10' indicated by a dotted line indicates a cam surface 10' formed symmetrically with the bent line 10 with respect to the axis of the operating rod, and therefore the opening is approximately triangular as shown in Fig. 1, as indicated by 8'. It may be hot.

The effect obtained by bending or bending the cam surfaces 10, 10' of the cylindrical member 2 as shown in FIG. 2 will be described.

Now, if we consider the case where the operating handle 1 is rotated counterclockwise, the handle and the cylindrical member 2 integrated therewith are rotated in the direction of arrow A while the cam surface 10 is in contact with the stationary pin 9. , which compresses the spring 7. In this case, if the opening is, for example, circular, the cam surface 10 rapidly increases its slope as the rotation angle of the handle increases, so the degree of compression of the spring increases rapidly, and as a practical matter, the rotation of the handle increases. The movement will remain at a relatively small angle. Therefore, although the cam surfaces 10 and 10' have a substantially constant inclination angle in the opening 8 in FIG. 1 (in other words, a spiral along the surface of the cylindrical member 2), in FIG. In order to increase the rotational force as much as possible, and to avoid a sudden increase in the rotational force, the cam surfaces 10, 10' of the opening are made more gentle than the spiral shape with a constant inclination, so that the helical angle decreases as the rotation angle of the handle increases. It is. However, even the minimum helical angle of the openings or grooves 8, 8' must be within a range larger than the so-called locking angle at which no return cam movement can occur due to the elastic force of the spring 7. .

Note that while operating the parking brake, i.e., while pulling the operating rod to tighten the brake, or pulling the handle to release the brake, the above-mentioned steering wheel safety device is in the first position. As shown in the figure, the compression spring 7 is in a fully extended state, and the upright pin 9 of the operating rod is pressed against the apex of the triangular opening 8 of the cylindrical member 2, so the handle 1 is pulled even harder. If so, these steering wheel safety mechanisms are completely outside the operating dynamics system, and the steering wheel operation is similar to that of a conventional stick-type parking system in which the steering wheel is fixed to the operating rod.
The operating state is exactly the same as that of the brake, and the dynamic system at that time is the reaction force of the brake and the pull on the steering wheel.
It is understood that this poses a problem with the human power involved in rotating the machine. Therefore, the action to release the parking brake is the same as in the general case; pull the handle 1 to release the operating rod 4 from engagement with the pawl, and then rotate the handle to return the handle to the front. However, there is no difference from the conventional method in that it is possible to rotate the handle while pulling the handle to the extent that the engagement friction of the claws is eliminated, and to allow the handle to be held out by the reaction force of the brake.

[Brief explanation of the drawing]

Fig. 1 is a partial sectional view illustrating the safety device of the parking brake operating handle of the present invention;
The figure is a developed view of main parts showing another embodiment. 1... Operation handle, 2... Cylindrical member, 3...
Fixed plate body, 4... Operating rod, 7... Compression spring, 8...
...opening of cylindrical member, 9...standing pin of operating rod,
10...Cam surface.

Claims (1)

[Claims for Utility Model Registration] 1. A fixed guide tube that guides and holds an operating lever for pulling a parking brake cable, and a lock tooth provided on a side line of the operating lever that engages with the lever to move the operating lever to a tension position. A stick-type parking brake having a pawl pivotally supported on the fixed guide tube for holding, and a handle attached to the free end of the operating rod, the cylindrical member 2 being integral with the operating handle 1; Said cylindrical member 2
The cylindrical member 2 has a compression spring 7 interposed between the end surface of the parking brake operating rod 4 fitted from one end and the bottom surface of the other end of the cylindrical member 2. A pin 9 has an opening 8 in the form of an isosceles triangle with its apex facing toward the base of the operating rod 4 on the side surface of the body, and stands upright on the side surface of the operating rod 4 that is inserted into the cylindrical member 2. passes through the opening 8 of the isosceles triangle of the cylindrical member 2 and is constantly pressed in the direction of the apex of the isosceles triangle by the elastic force of the compression spring 7.
Brake operating handle safety device. 2 Inclined cam surface 1 of the opening 8 of the cylindrical member 2
0,10' has a substantially constant helical angle with respect to the cylindrical member.
The safety device for the stick-type parking brake operating handle described in 2. 3 Inclined cam surface 1 of the opening 8 of the cylindrical member 2
0 and 10' are the stick-type parking brake operation handle according to claim 1, which has a helical angle that continuously decreases in the direction approaching the compression spring 7 with respect to the cylindrical member. safety equipment. 4 Inclined cam surface 1 of the opening 8 of the cylindrical member 2
0 and 10' indicate the stick-type parking brake operation according to claim 1, which has a helical angle with respect to the cylindrical member that decreases intermittently in the direction approaching the compression spring 7. Handle safety device.