JPS5941175Y2 - Stick type parking brake operating device - Google Patents

Description

[Detailed Description of the Invention] This invention relates to an improvement of a stick-type parking brake operating device for an automobile.

Conventionally, a rack is provided along the axial direction of the brake operating rod, and a ratchet that engages with the rack is pivotally mounted on the vehicle body side.
A stick-type parking brake operating device is well known in which the brake operating rod is pulled up, the rack is engaged with a ratchet to maintain the braking state, and the brake operating rod is rotated to disengage the rack and ratchet. .

However, with the above-mentioned conventional brake operating device, there is a risk that the rack and ratchet may disengage just by turning the brake operating rod, and when the driver leaves his seat, his hands, feet, etc. may inadvertently come into contact with the brake handle. This caused the problem that the brake operating rod would rotate and the brake would be released.

This idea was made in view of the safety issues with the conventional walking stick type parking brake operating device, and the brake release operation is a two-step operation, so that the driver's hands and feet are not careless. To provide a walking stick type parking brake operating device which has a simple structure and excellent safety and does not release the brake even if it comes in contact with a brake handle.

Therefore, in the stick-type parking brake operating device according to this invention, the rack part of the brake operating rod has a
While providing a cut groove along the axial direction, the ratchet is provided with a protrusion that protrudes into the cut groove, and the protrusion is bent outward of the brake operating rod, so that in the braking state when the ratchet is engaged with the rack, the cut groove is The protruding portion prevents the brake operating rod from rotating around its axis, and when the brake operating rod is slightly pulled up in the axial direction from the braking state, the ratchet rides on the peak of the rack, thereby causing the above-mentioned The basic feature is that the brake can be released by removing it from the cut groove and rotating the brake operating rod.

This invention will be described in detail below with reference to the illustrated embodiments.

In Figures 1 and 2, 1 has a brake handle 2 attached to its upper end, while a fork joint 3 for connecting to a parking brake device via a lever wire or the like (not shown) is relatively rotatable at its lower end. The brake operating rods are connected by pins, 4 is a rack provided along the axial direction of the brake operating rod 1 over a range necessary and sufficient for brake operation, and 5 is the shaft portion 1a of the brake operating rod 1 on which the rack 4 is provided. A rack guide that is rotatable and movable in the vertical direction; 6 is a support bracket that fixes the rack guide 5 to the vehicle body; 7 is a support bracket 6 that is connected to an opening 5a provided in the body of the rack guide 5 by a pivot 8; A ratchet is pivotally mounted so as to face the ratchet, 9 is a spring that urges the tip 7a of the ratchet 7 to engage with the rack 4 of the brake operating rod 1, and 10 is a spring that urges one end to the fork joint 3 and the other end to the brake lever. Suspended from the connecting pin 11 fixed to the lower end of the operating rod 1,
The brake operating rod 1 is always positioned so that the rack 4 of the brake operating rod 1 is positioned facing the opening 5a of the rack guide 5, in other words, so that the ratchet 7 can engage with the rack 4. It is a return spring that returns it to the correct position.

'In this embodiment, as shown in FIGS. 1 and 2, the notch 12 that divides the rack 4 of the brake operating rod 1 into two at the center of its width is cut over a range that is appropriately longer than the length of the rack 4. On the other hand, as shown in the perspective view in FIG.
3 is provided, and when the ratchet 7 engages with any rack tooth of the rack 4, the protrusion 13 protrudes into the cut groove 12, and the protrusion 13 prevents the brake operating rod 1 from moving in either the left or right direction. Try not to rotate.

Note that the cut groove 12 is formed as a cut groove 12 provided at the center of the rack 4 in the width direction, as shown in FIG. 4a.

Next, the effect will be explained.

The tip 7a of the ratchet 7 and the rack 4 are engaged only in one direction, and as shown in Figs. state).

In this braking state, the rack 4 and the ratchet 7 are in the state shown in FIG. It is locked in the direction.

Therefore, even if the brake handle 2 is inadvertently touched and the brake operating rod 1 is attempted to be turned in the brake release direction A,
The side wall portion 12a is engaged with the protruding portion 13 and the brake operating rod 1
Rotation in direction A is prevented, the brake state is maintained, and the brake is locked.

In this case, in FIG. 4a, the left side wall portion 12'a in the figure engages with the protrusion 13 to achieve the above-mentioned lock.

Next, the operation when the brake state is released will be explained.

Even if the brake operating rod 1 is in a braking state, the brake operating rod 1 can be retracted a small amount due to the elasticity and deflection of each connecting portion.

The present device takes advantage of this point and retracts the brake operating rod 1 in the state shown in FIG. 5 by an appropriate amount.

In this state, the ratchet rides up the mountain of the rack, causing the protrusion 13 to come out of the cut groove 12. In this state, the brake operating rod 1 is moved in the direction A (
2) to release the engagement between the tip 7a of the ratchet 7 and the rack 4, and push down the operating rod 1 in the direction C (FIG. 2) to release the above-mentioned brake state.

If you release the brake handle 2 in this brake released state,
The brake operating rod 1 is rotated in the direction B (FIG. 2) by the return spring 10, so that the cut groove 12 returns to the position corresponding to the protrusion 13.

Next, the effect when applying the brake will be explained.

Since the rack 4 does not engage the tip 7a of the ratchet 7 in the retraction direction D (FIG. 2) of the brake operating rod 1, the parking brake can be applied by retracting the brake operating rod 1 in that direction.

As described above, the cut groove 12 of the brake operating rod 1 is returned to the corresponding position of the protrusion 13 by the return spring 10, and in this state, the brake operating rod 1 is pulled in the direction to apply the parking brake.

In this braking state, the rack 4 is engaged with the tip 7a of the ratchet 7 as shown in FIG.
is held in the brake state.

Further, the protrusion 13 protrudes into the cut groove 12 to prevent rotation of the brake operating rod 1 in the brake release direction A, thereby locking the brake state.

By the way, a case will be described in which the brake operating rod 1 is retracted in a state where the cut groove 12 and the protrusion 13 do not correspond to each other and are deviated from each other.

When the protruding part 13 is in the bent state, if you release your hand from the brake handle 2 after retracting the brake operating rod 1, the rack 4 will move to the protruding part before the rack 4 is locked to the tip 7a of the ratchet 7. 13 in the direction away from the rack 4, the rack 4 cannot be engaged with the tip 7a of the ratchet 1-7, and the brake operating rod 1 is pushed back in the direction C, making it impossible to maintain the braking state.

In other words, when the protrusion 13 is curved, the braking state is maintained only when the cut groove 12 corresponds to the protrusion 13 when the brake operating rod 1 is retracted, and when maintained in this way, the brake is always The state is locked.

As mentioned above, this invention provides a notch groove along the rack part in the rack part of the brake operating rod, and also provides a protrusion part that can engage with the notch groove in the ratchet pivotally connected to the vehicle body. To provide a walking stick type parking brake operating device which locks a rack with a ratchet and simultaneously prevents rotation of a brake operating rod during braking.

Therefore, according to this invention, there is no risk of inadvertently rotating the brake handle, and the release of the brake can only be prevented by a two-step operation of pulling up and rotating, thereby further improving safety. ,
In addition, the advantage of structure No. 7 can be obtained that it can be easily implemented by simply providing a cut groove and a protrusion in a conventional structure.

[Brief explanation of the drawing]

FIG. 1 is a front view of a stick-type parking brake operating device according to an embodiment of this invention, and FIG. 2 is a side view thereof.
FIG. 3 is a perspective view showing an example of a ratchet according to this invention, FIG. 4a is a sectional view taken along the line N-N in FIG. FIG. 2 is an enlarged cross-sectional view of essential parts showing the engagement state between the ratchet and the rack during braking. 1... Brake operating rod, 2... Brake handle, 4... Rack, 7... Ratchet, 9... Spring, 10...・・・・・・
・Return spring, 12... Cut groove, 1
3... Protrusion.

Claims (1)

[Scope of utility model registration request] The brake operating rod, which is biased in a certain rotational direction by a return spring, is slidably supported by a rack guide attached to the vehicle body, and a rack is formed in the axial direction of the brake operating rod. A mating ratchet is rotatably attached to the rack guide, and the ratchet is always biased by a biasing spring in the direction of engaging with the rank. A cane-type parking brake device in which the ratchet and the rack are disengaged and the braking state is released by rotation in the circumferential direction of the stick, the stick-type parking brake device having a cane attached to the central portion of the rack along the axial direction of the brake operating rod. The protrusion is formed at the center of the tip of the ratchet that engages with the rack in the braking state, and the protrusion prevents the engagement between the rack and the ratchet. The ratchet is bent outward of the brake operating rod so that it protrudes into the notched groove when the brake is engaged, and when the brake operating rod is pulled up from the brake state, the ratchet rides up the peak of the rack and escapes from the groove. A walking stick type parking brake operating device.