JPS6313982Y2 - - Google Patents

Description

[Detailed explanation of the idea] The present invention relates to a tilt stopper device.

The maximum tilt angle of the cab of a cab-over type vehicle is generally set at around 50 degrees due to the size of the inspection building and the load placed on the cab and chassis front structure. Therefore, when the cab is tilted, a downward moment is applied to the cab.In contrast, the hydraulic cylinder for tilting the cab is of the oil lock type, which means that when the hydraulic cylinder stops operating, the hydraulic cylinder It is required that no oil inflow or discharge occurs. This is based on the premise that the hydraulic system is completely oil-tight. However, if particles mixed into the oil for various reasons impair the oil tightness and the cab descends over the worker's head, it is dangerous, so mechanical safety devices other than the oil lock mentioned above are required. It is.

That is, in the conventional example shown in FIG. 1 (see Japanese Patent Laid-Open No. 57-77273 as an example), the cab 1 is rotatably supported around the tilt center 3 of the chassis frame 2, and there is a hydraulic pressure between the two. A hydraulic cylinder 5 of a cylinder device 4 is interposed. A lever 6 is connected to a bracket 8 on the cab 1 via a pin shaft 7, and a plurality of teeth 9 are formed on the lever 6 on the side of the hydraulic cylinder 5. This lever 6 cooperates with the hydraulic cylinder 5 to constitute a tilt stopper device 10 for preventing the cab 1 from tilting down when the oil lock is damaged. A stopper block 11 that meshes with teeth 6 and 9 is fixedly installed.

The disengagement device 12 releases the lever 6 to a non-operating position when the cab 1 is tilted down.
When the handle 13 is pulled, the arm 15 connected to the stopper block 11 via the pin shaft 14 is rotated against the force of a spring 16 interposed between the bracket 8 and the lever 6, and the lever 6 is rotated at the bent portion. 6a is pushed and released outward, and the teeth 9 and stopper lock 11 are unlocked.

Therefore, when the oil lock of the hydraulic cylinder device 4 is damaged and the cab 1 is lowered, the lever 6
One tooth 9a of the upper set of teeth engages with the stopper lock 11, as shown in the figure, to prevent the cab 1 from further lowering.

However, in this conventional device, when the hydraulic cylinder device 4 is operated to the down side during tilt-down, since the stopper block 11 is attached to the hydraulic cylinder 5, a bending moment as shown by arrow a acts, and therefore the hydraulic pressure The strength of the cylinder 4 and the sealing performance of the oil seal used in the hydraulic cylinder 4 are reduced.

As a countermeasure to this problem, the lever 6
is swingably supported by a lost motion lever 23 attached to the cab 1 together with the hydraulic cylinder 5 via a pin shaft 7a, and is biased from the hydraulic cylinder 5 in the opening direction, that is, forwardly, by a spring 17. An engaging element or locking pin 18 that engages with teeth 9 of 6 is attached to a bracket 19 fixed to the chassis frame 2. This bracket 19 has a release lever 20 attached to the pin shaft 2.
1, and is urged by a release lever spring 22 in a direction away from the teeth 9, that is, forward. At the tip of the release lever 20, when the release lever 20 is rotated by pulling the handle 13 and the engagement between the tooth 9 and the lock pin 18 is released, the lever 6 is rotated by pressing the tooth 9 while sliding. , a sliding surface 20a is formed to release the engagement. As shown in the figure, the upper surface of the tooth 9 is inclined so as not to get over the lock pin 18 and prevent the tilt-up during tilt-up, and the lower surface thereof is adapted to engage.

Therefore, when the handle 13 is pulled, the release lever 20 rotates, and its sliding surface 20a contacts the tip of the tooth 9a engaged with the lock pin 18, and rotates while pressing this. As a result, lever 6
is pushed by the tooth 9a and escapes outward against the biasing force of the spring 17, and the engagement between the tooth 9a and the lock pin 18 is released.

However, in this device, when the lever 6 is traveling as shown in FIG. 3, that is, when the tilt-down is completed, the lever 6 is urged by the spring 17 to rotate in the direction of arrow b, that is, forward, but the lever is not engaged. Since there is no stopper to stop the vehicle, it may swing due to acceleration/deceleration or vibration during driving, causing problems such as interference with surrounding parts.

SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide a tilt stopper device that prevents the lever from swinging while the vehicle is running and prevents interference with surrounding components.

According to the present invention, a hydraulic cylinder, a lever that is swingably attached to either the cab side or the frame side and has a plurality of teeth, and a lever that is attached to the other side and engages with the teeth to tilt down. an engaging element for blocking, the lever being constantly biased in a direction to engage the engaging element by a spring member;
In addition, the teeth are formed in a shape that does not prevent tilt-up by climbing over the engagement element when tilting up, and in a direction in which the engagement between the teeth and the engagement element is released while contacting the teeth with a sliding surface that does not engage with the teeth. The cab tilt stopper device includes an engagement release means for moving the lever against the biasing force of the spring member, the guide lever being attached to the lever and having a cam surface formed thereon, and the guide lever being attached to the hydraulic cylinder. A tilt stopper device is provided which includes lever swing prevention means comprising a guide pin that engages with the guide lever.

Therefore, the swinging of the lever during running is prevented by the guide lever and the guide pin, and interference with surrounding parts is prevented.

Hereinafter, embodiments of the present invention will be described in detail with reference to FIGS. 4 to 9.

4 and 5, a pair of guide levers 26a and 26b are attached to the upper part of the lever 6 on the side of the hydraulic cylinder 5, sandwiching the lever 6 therebetween. And the hydraulic cylinder has a guide lever 26.
Guide pins 27 are attached to the sides of a and 26b. These guide levers 26a and 26b are shown in FIG.
The guide lever 26a has a shape shown in FIGS. 7a and 7b, and a cam surface 28 is formed on the lever 6 side. When the cam surface 28 becomes lower than the lock pin 18, the cam surface 28 and the guide pin 27 begin to engage, and then the cam surface 26c of the guide lever 26b engages, and when the tilt down is completed, the 8th
As shown in the drawings and FIG. 9, the cam surface 28 and the recess 26d are formed so that the guide pin 27 restrains the guide levers 26a, 26b and prevents them from swinging.

Next, the effect will be explained.

The cab 1 tilts down, and the uppermost tooth 9a of the lever 6 touches the lock pin 18, as shown in FIG.
When the position is lower, the guide pin 27 and the cam surface 28 of the guide lever 26a begin to come into contact with each other. When the cab 1 further descends, the lever 6 moves to the guide lever 2.
When the cam surface 28 of the guide lever 26b pulls the hydraulic cylinder 5 toward the hydraulic cylinder 5 side, and the tilt-down is almost complete, the cam surface 26c of the guide lever 26b also moves toward the guide pin 2.
7. Then, the lever 6 is pulled toward the cylinder side by the cam surfaces 28 and 26c, and the guide pin 27 is moved toward the straight part 29 (the sixth
9) and the recess 26d of the guide lever 26b (FIG. 7). When the tilt down of the cab 1 is completed, it will be in the state shown in Figs. 8 and 9, and the guide pin 2
7 is held at one end by being sandwiched between the straight part 29 of the guide lever 26a and the lever 6, and the other end of the guide pin 27 is held by the concave part 2 of the guide lever 26b.
6d and is held loosely. In this state,
The lever 6 is pushed forward by the hydraulic cylinder 5 by the spring 17, and is also locked by the guide pin 27 held by the guide levers 26a and 26b. This reliably prevents the lever 6 from swinging relative to the piston 5 while the vehicle is running.

As explained above, according to the present invention, since a means for preventing swinging of the lever is provided between the lever and the hydraulic cylinder, swinging of the lever is reliably prevented while the vehicle is running.

[Brief explanation of the drawing]

Figure 1 is a side view showing a conventional device, and Figure 2 is a side view of a conventional device.
A side view of the device improved from the device shown in Figure 3.
4 is a side view showing one embodiment of the present invention, FIG. 5 is a partial cross-sectional view of FIG. 4, and FIG. 6 is a front view of one guide lever. Figure 7a is a front view of the other guide lever, Figure 7b is a side view of Figure 7a, Figure 8 is a side view of Figure 4 when the tilt-down is completed, Figure 9 is the side view of Figure 8. It is a detailed diagram of the relationship between the guide lever and the guide pin in the state. 1... Cab, 5... Hydraulic cylinder, 6... Lever, 9... Teeth, 17... Spring, 18... Lock pin, 20... Release lever, 20a... Sliding surface,
26a, 26b...Guide lever, 27...Guide pin, 28...Cam surface, 26c...Cam surface.

Claims (1)

[Scope of utility model registration request] A hydraulic cylinder, a lever that is swingably attached to either the cab side or the frame side and is formed with a plurality of teeth, and an engagement element that is attached to the other side and engages with the teeth to prevent tilt down. The lever is always biased by a spring member in the direction of engaging with the engagement element, and the teeth are formed in a shape that does not prevent the engagement element from climbing over the engagement element during tilt-up, and A tilt stopper device for a cab, comprising an engagement release means for moving the lever against the biasing force of the spring member in a direction to release the engagement between the teeth and the engagement element while making contact with the teeth on a sliding surface that does not engage. The tilt stopper is characterized in that it is equipped with a guide lever that is attached to the lever and has a cam surface formed thereon, and a lever swing prevention means that is made of a guide pin that is attached to the hydraulic cylinder and engages with the guide lever. Device.