JPS6135502Y2 - - Google Patents

Description

[Detailed Description of the Invention] This invention relates to a cab tilt device for a cab-over type vehicle.

Some cab-over type vehicles, in which the cab, i.e., the driver's seat, is advanced above the engine compartment, are designed so that the cab can be tilted relative to the chassis for inspection and maintenance of the inside of the engine compartment, etc. Figure 1 shows an example of such a cab tilt device. The upper cab 1 is connected to the lower chassis frame 2 by a tilt pin (not shown) and can rotate around the tilt pin. The rotation of the cab 1 is performed by a hydraulic cylinder 6 including a rod 5 rotatably attached by a pin 4 to a cab bracket 3 fixed to the cab 1, and its lower end is connected to a pin 7.
The hydraulic cylinder 6 is rotatably attached to the chassis frame 2 by a pin 9. A stopper stay 8 is pivotally attached to the cab bracket 3 in parallel to the side of the hydraulic cylinder 6 by a pin 9. The stopper stay 8 has a U-shaped cross section and a number of engagement holes 10 are provided in the back portion in the longitudinal direction. The stopper stay 8 is constantly biased in the clockwise direction by a torsion spring 11 provided around the pin 9.
Just below a, a cylinder bracket 12 is fixed to the outer periphery of the cylinder 6, and a lock lever 13 is pivotally attached to it by a pin 14. The lock lever 13 is constantly biased in the clockwise direction by a torsion spring 15 provided around the pin 14, and its tip is
The stopper stay 8 can be engaged with the engagement hole 10,
The rear end of the cylinder 6 is connected to the upper flange 6a of the cylinder 6.
The support is attached at a position that allows it to engage with the underside of the support.
One end of a lock release link or wire 16 is connected to the rear end of the lock lever 13, and the other end of the link or wire 16 is connected to an operating lever inside the cabin.

Next, the operation of this device will be explained. First, when an electric pump (not shown) is turned on and the hydraulic cylinder 6 is driven, the rod 5 is extended and the cabin 1 is rotated around a tilt pin (not shown) and tilted with respect to the chassis frame 2. At this time, as the rod 5 expands, the stopper stay 8 is also pulled upward while being biased by the spring 11, but the lock lever 13 is
The lower slope of the tip is the engagement hole 10 of the stay 8.
It hits the lower edge of and rotates counterclockwise and escapes. Then, when rod 5 is fully extended, stay 8
When the lock lever 13 engages with the engagement hole 10a at the bottom of the stay 8, the touch plate 17 provided at the bottom of the stay 8 presses the switch 18 provided at the cylinder 6, thereby opening the electrical circuit of the electric pump. When the pump is opened, the pump stops, the oil pressure in the cylinder 6 is maintained, and the cab tilt operation is completed. When the cabin 1 starts to descend due to some kind of accident, the engagement hole 1 of the stay 8
The tip of the lock lever 13 that is engaged with the lock lever 13 is pushed down by the stay 8, and its rear end hits the lower surface of the upper flange 6a of the cylinder 6, preventing the stay 8 and the cabin 1 from falling further. , ensuring worker safety. To return the cabin 1 to its original position, pull the lock release link or wire 16 and release the lock lever 1.
3 is removed from the engagement hole 10a, the cylinder 6 is operated to contract the rod 5 and return it to the state shown in FIG.

In such a cab tilt device, the spring 11 for constantly biasing the stay 8 in the clockwise direction and the spring 15 for constantly biasing the lock lever 13 in the clockwise direction are both essential parts. Without these, the stay 8 would play and the lock lever 13 would not be able to perform its locking function.

The purpose of this invention is to create a cab tilt device in which these two springs are combined into one, and the role played by conventional two springs is fulfilled by this one spring. It is about providing.

FIG. 2 shows an embodiment of this invention, and FIG. 3 is a perspective view showing its outline. Components having the same functions as those shown in FIG. 1 are given the same reference numerals, and the configuration other than those specified is generally the same as the device shown in FIG. 1.

A characteristic feature of this invention is that a stay guide member 19 is attached to a pin 2 on the outside of the stay 8 of the cylinder bracket 12 fixed to the outer periphery of the cylinder 6.
It is pivoted by 0. And between this stay member 19 and lock lever 13,
A tension spring 21 is attached with the stay 8 in between. In this embodiment, one end of the spring 21 is connected to the lock lever 13.
The latch lever 22 is not attached directly to the lock lever 13 but can be rotated integrally with the lock lever 13.
It is attached to a tongue 23 fixed to the.
One end of the latch lever 22 is connected to the lock lever 13.
and the other end is fixed to the pin 14.
It is connected to the lock release wire 16. The rear end of the lock lever 13 comes into contact with the outer wall of the cylinder 6 when a pressing force is applied from above by the stay 8. Further, in order to release the guide lock 24 provided on the stay guide member 19, the cylinder bracket 12 is provided with an arc-shaped elongated hole 25 centered on the pin 20.

In this way, in this invention, the stay 8 is provided between the lock lever 13 and the stay guide member 19.
Since the tension spring 21 is provided with the stay 8 in between, the stay 8 is always pressed against the guide rod 24 of the stay guide member 19 and does not play.
Further, the lock lever 13 is always biased clockwise so that its tip engages with the engagement hole 10 of the stay 8 to perform a locking function. Therefore, the functions of two springs in the conventional device can be provided by this one tension spring 21, and both the number of parts and costs can be reduced.

[Brief explanation of the drawing]

FIG. 1 is a schematic side view showing an example of a conventional cab tilt device, FIG. 2 is a schematic side view of a cab tilt device according to this invention, and FIG. 3 is a schematic partial perspective view of FIG. 2. 1...cabin, 2...sheer sea frame,
6...Hydraulic cylinder, 8...Stopper stay, 10...Engagement hole, 12...Cylinder bracket, 13...Lock lever, 16...Lock release wire, 20...Stay guide member, 21...
tension spring.

Claims (1)

[Claims for Utility Model Registration] Hydraulic cylinders that are pivotally connected to a chassis frame and a cabin, respectively, to tilt the cabin with respect to the chassis frame; and a stopper that is parallel to the cylinder and that is pivotally coupled to the cabin. a stay; a cylinder bracket fixed to the outer periphery of the cylinder; a lock lever pivotally connected to the bracket so that one end can be engaged with the outer periphery of the cylinder and the other end can be engaged with the engaging portion of the stay; a stay guide member pivotally connected to the bracket and disposed outside the stay; a tension spring provided between the lock lever and the stay guide member with the stay in between; and a tension spring between the lock lever and the stay. A cab tilt device comprising a release means for releasing the engagement.