JPH057319Y2 - - Google Patents

Description

[Detailed Description of the Invention] Industrial Application Field This invention relates to a parking brake and a turning lock device for a wheeled turning work vehicle.

BACKGROUND TECHNOLOGY Conventionally, in a swing work vehicle in which an upper revolving body having a work implement is rotatably provided on a lower body which can move freely by wheels, the upper revolving body is locked to prevent it from rotating when parking. The lower body side is also braked by the parking brake. In addition, if these can be operated independently, there is a risk of forgetting to turn on one of them, so there have already been proposals to link these to prevent forgetting to turn on one (for example, Jikkosho). 53-19539, Utility Model Application Publication No. 55-67261, etc.).

Problems to be Solved by the Invention However, in the above-mentioned conventional device, the parking brake cannot be released unless the turning lock is released, so for example, in order to start after parking on a slope, the turning lock must first be released. Then, due to the work equipment's own weight, the upper revolving body rotated against the driver's will, resulting in a dangerous situation.

This invention was made for the purpose of improving the above-mentioned problems.

Means and Effects for Solving Problems A parking brake lever is installed near the driver's seat to apply and release the parking brake, and the upper revolving body and lower vehicle body 1 are provided so as to be movable up and down when lowered. The parking brake is provided with a swing lock pin that locks between the two and a locking hook that is interlocked with the parking brake lever and engages only when the swing lock pin is in the swing lock state to prevent release of the swing lock pin. To provide a parking brake and a turning lock device for a wheeled turning work vehicle, in which the turning lock cannot be released unless the turning lock is released, so that the vehicle can be started safely even on a slope.

Embodiment An embodiment of this invention will be described in detail with reference to the drawings. In the figure, reference numeral 1 denotes a lower vehicle body that is movable on wheels (not shown), and an upper rotating body 2 is provided on the lower vehicle body 1 so as to be freely swingable.

Reference numeral 3 denotes a driver's seat installed on the floor plate 4 of the upper revolving structure 2, and a parking brake lever 5 is provided upright on the right side of the driver's seat 3, for example. A knob 5a is provided at the upper end of the parking brake lever 5, and when this knob 5a is pulled up, a parking brake 6, which will be described later, is
is in an activated state, and when pushed down, it is in a released state. At the same time, one end of a swinging lever 7 whose substantially middle portion is pivotally supported below the floor plate 4 is pivotally attached to the lower end of the parking brake lever 5. The other end of the swinging lever 7 has interlocking rods 8a and 8b separated by a gap Y.
and is connected to the parking brake 6 via a linkage 8 consisting of a link 8c and a connecting rod 8d,
The gap Y provided between the connecting rods 8a and 8b allows the upper rotating body 2 to rotate relative to the lower vehicle body 1.

Further, in the vicinity of the parking brake lever 5, there is provided a push-pull cable 10 whose jacket 10a is fixed to the upper revolving structure 2 by a bracket 11, and the core wire 10 of this push-pull cable 10 is
One end of the push-pull cable 10 is secured to the tip of a bracket 12 whose base end is fixed to the swing lever 7, and the other end of the push-pull cable 10 is connected to a swing lock pin provided below the driver's seat 3. The 13th side is extended.

The swing lock pin 13 has a large diameter part 13a and a small diameter part 13b, and the large diameter part is supported by a guide bush 14 provided on the upper rotating body 2 side so as to be vertically movable.

Further, the upper end side of the small diameter portion 13b penetrates the floor plate 4 and projects onto the floor plate 4, and the tip portion is bent at an approximately right angle to form a handle 13c.
When C is pushed down to the position A in Figure 1, the large diameter part 13
The tip of a is inserted into the lock pin receiving seat 15 provided on the lower vehicle body 1 side from above, and the lower vehicle body 1 is inserted.
The space between the upper rotating body 2 and the rotating upper body 2 can be locked.

On the other hand, a locking hook 16 is pivotally supported near the turning lock pin 13 by a pin 17 so as to be able to rotate in the horizontal direction. The other end of the core wire 10b of the push-pull cable 10 is connected to the hook 16, and is adapted to be rotated around a pin 17 in conjunction with the operation of the parking brake lever 5. The stop hook 16 has a turning lock pin 1.
A concave groove 16a is formed in which the small diameter portion 13b of No. 3 can engage, and the swing lock pin 13 can be locked in the following manner.

Note that 18 in the figure indicates that if the tip of the swing lock pin 13 is erroneously operated in the position C shown in FIG.
The stopper 19, which prevents engagement with b, represents a locking piece that holds the pivoting lock pin 13 in the released position.

Next, the operation will be explained with reference to FIGS. 6a to 6c. When parking the vehicle after finishing the work, the upper rotating body 2 is rotated to a position where the upper rotating body 2 faces forward with respect to the lower body 1. In this state, the handle 13c of the swing lock pin 13 is removed from the locking piece 19, and the swing lock pin 13 is dropped.
3 to the lock pin receiving seat 15 on the lower vehicle body 1 side.
to lock the rotation of the upper revolving body 2.

Next, in this state, the knob 5a of the parking brake lever 5
When the parking brake 6 is pulled up, the parking brake 6 is activated to the braking state via the swing lever 7 and the linkage 8, and at the same time, the core wire 10b of the bushable cable 10 is pulled by the swing of the swing lever 7, and the locking hook is pulled up. pivots around the pin 17 toward the swing lock pin 13, and the concave groove 16a of the locking hook 16 fits into the small diameter portion 13b of the swing lock pin 13, causing the swing lock pin 13 to rise as shown in FIG. 6a. to lock.

Next, when starting the vehicle to start work, first push down the parking brake lever 5 to release the parking brake 6. As a result, the locking hook 16 is rotated in the release direction via the bushable cable 10, so that the swing lock pin 13 can only be released after the parking brake 6 is released.

Therefore, even if the parking brake 6 is inadvertently released while the vehicle is parked on a slope, the upper revolving structure 2 will not rotate under the weight of the work equipment or the like, so it is safe.

Also, when releasing the rotation lock, use the handle 13c.
After pulling up the swing lock pin 13, by hooking the handle 13c onto the locking piece 19, the swing lock pin 13 will not fall due to its own weight, and even if the parking brake lever 5 is operated during work, the swing lock will be released. Inside, as shown in FIG. 6b, the large diameter portion 13a of the swing lock pin 13 is located near the locking hook 16, so the swing lock pin 13 is not locked by the lock hook 16.

On the other hand, if there is a misalignment between the lower vehicle body 1 and the upper rotating body 2 during the turning lock, and the tip of the turning lock pin 13 is not inserted into the lock pin receiving seat 15 on the lower vehicle body 1 side. Since the stopper 18 provided on the small diameter portion 13b is in the position of the locking hook 16, even if the parking brake lever 5 is operated in this state, the locking hook 16 will not lock the swing lock pin 13, thereby preventing erroneous operation. However, it is easy to judge.

Effects of the invention As detailed above, this invention makes it possible to release the turning lock only after releasing the parking brake. Therefore, after parking on an incline, it is possible to release the parking brake in order to start again. Even though
It is safe because the upper revolving body will not be inadvertently rotated by the weight of the work equipment or the like.

[Brief description of the drawings]

The drawings show one embodiment of this invention; Fig. 1 is a longitudinal side view, Fig. 2 is a partially omitted plan view, Fig. 3 is a side view of the vicinity of the parking brake lever, and Fig. 4 is a view taken from the direction of Fig. 3. 5 is a plan view of the vicinity of the locking hook, and FIGS. 6 a to 6 c are explanatory views of the operation. 1 is the lower body, 2 is the upper rotating body, 3 is the driver's seat,
5 is the parking brake lever, 6 is the parking brake, 13
16 is a turning lock pin, and 16 is a locking hook.

Claims (1)

[Scope of utility model registration request] The parking brake 6 is installed near the driver's seat 3.
a parking brake lever 5 for braking and releasing the parking brake; a swing lock pin 13 that is provided on the upper revolving body 2 so as to be movable up and down and locks between the upper revolving body 2 and the lower vehicle body 1 when lowered; It is interlocked with the brake lever 5 and is engaged only when the swing lock pin 13 is in the swing lock state.
3. A parking brake and swing lock device for a wheeled swing work vehicle, comprising a locking hook 16 for preventing release of the parking brake.