JPS6246622Y2 - - Google Patents

Description

[Detailed Description of the Invention] This invention relates to a mechanical locking device for a cab.

In conventional cab-over type automobiles, the front end of the cab is pivotally mounted on the body frame, and when servicing the engine and auxiliary equipment located below the cab, the cab is tilted and rotated relative to the body frame. Many have structures that allow them to move. In this case, a tilt operating means such as a hydraulic cylinder device is provided between the cab and the vehicle body frame so as to rotate the cab to a predetermined tilt angle with respect to the vehicle body frame. However, this hydraulic cylinder device does not allow sand from outside,
Because it collects dust, the boots of the hydraulic cylinders are likely to get scratched and cause hydraulic leakage. For this reason, even if the oil pressure is locked, oil pressure leakage may cause the tilted cab to malfunction unexpectedly to return to the normal driving state, and the engine, etc. may be operated under the tilted cab. This has the disadvantage of impairing the safety of workers performing inspection work.

Conventionally, locking devices have been proposed to eliminate such inconveniences. For example, as shown in FIG. 1, a device 4 is known in which a lever 3 locks a vehicle body frame 1 and a cab 2 that maintains a predetermined tilt angle α with respect to the vehicle body frame. This locking device 4 locks the cab 2 by locking the lever 3 whose upper end is pivotally mounted on the cab 2 side and whose lower end is locked by the locking portion 6 of the hydraulic cylinder 5.
lock. However, with such a configuration, there is a problem that when the tilt angle α of the cab changes in multiple steps, the cab 2 cannot be locked at each tilt angle.

The object of this invention is to provide a mechanical cab locking device that can lock a cab that maintains multiple tilt angles at each position.

The cab mechanical lock device according to this invention is attached to a tilt operation means for tilting and rotating the cab, one end of which is pivotally mounted on the vehicle body frame, using a power cylinder, and locks the cab at a predetermined tilt angle. A lever having a plurality of lock holes formed therein is pivotally connected to the power cylinder via a shaft, and one end with the shaft as a central portion engages with the lock hole through an engagement surface. A stopper end is formed at the engaging end and the other end to contact the collar of the power cylinder through substantially the same plane as the engaging surface, and the engaging end engages with the lock hole and the stopper end an operating piece that is rotatable between a locking position where the locking member contacts the collar and restricting rotation and a releasing position where the locking member is disengaged from the locking hole; and an operating piece that is rotated toward the locking position. and a lock release means that moves the operation piece to a release position against the urging force of the urging means, and when the operation piece engages with the lock hole, The cab is locked at a tilt angle corresponding to the vertical position of the lock hole.

This kind of cab mechanical lock device is
The locking end of the operating piece is operated to engage with each lock hole at a different position in the vertical direction. Therefore, each time the locking end engages with a different lock hole, the cab can be locked at a tilt angle corresponding to each lock hole.

This invention will be explained below with reference to the accompanying drawings.

FIG. 2 shows a cab mechanical locking device (hereinafter simply referred to as a locking device) 7 as an embodiment of this invention. This locking device 7 is connected to a cab 9 and a body frame 1 of a cab-over type automobile 8.
It is installed across 0. When the cab 9 is in a running state, the front end thereof is attached to the vehicle body frame 10 via a tilt pin 11 so as to be tiltable, and the rear end of the cab 9 is fixed to the vehicle body frame 10 side by a fixing device (not shown). This, Kiyabu 9
is tilted and rotated so as to maintain a desired tilt angle _α1 , as shown by a dashed line in FIG. In this case, a hydraulic cylinder device 13 as a tilt operation means that applies a tilt operation force to the cab 9.
is activated. This hydraulic cylinder device 13 is connected to a known hydraulic circuit device (not shown), and includes a cylinder casing 14 whose lower end is pivotally connected to the vehicle body frame 10, and a bracket that protrudes from the upper end of the cylinder casing and has a cab 9 at its upper end. 1
5 and a rod 16 connected to the rod 5. That is, as shown in FIG. 3, the upper end of the rod 16 is inserted through a rod guide member 17 provided in the bracket 15. As shown in FIG. A ball bearing member (not shown) is incorporated in the rod guide member 17, and an abutting member 18 fixed to the rod 16 is attached to the rod guide member 1.
7, a tilt operation force can be applied thereto. At this time, since the ball bearing member rotates according to the tilting displacement of the rod 16, the abutment member 18 can always be in uniform contact with the rod guide member 17 on the tilting cab side, and the pressing force can be It is convenient for applying tilt operation force as

The lock device 7 is attached to the hydraulic cylinder device 13. That is, the locking device 7 includes an operating piece 20 which is pivotally attached to the upper end of the cylinder casing 14 via an operating shaft 19, and a highly rigid operating piece 20 whose upper end is pivotally attached to the bracket 15 via a pin 21 (as shown in FIG. 5). and a lever 22 (having a U-shaped cross section). The lever 22 is suspended from the bracket 15, and
A helical spring 23 attached around the pin 21 constantly urges the operating piece 20 to rotate. This lever 22 is provided with a plurality of lock holes 24 in its longitudinal direction, that is, in the vertical direction. On the other hand, the operation piece 20
As shown in Fig. 4, almost the center is the operating shaft 1.
It is integrally connected to 9. The operating shaft 19 has one end pivotally connected to a mounting member 25 fixed to the cylinder casing 14, and an arm 26 at the other end.
is fixed. A lock release operation link 27 serving as a lock release means is connected to the rotating end of the arm 26 via a wire 28. The operating piece 20 is formed with a stopper end 201 on one side and an engagement end 202 that can be engaged with a lock hole 24 of the lever on the other side.
As shown in FIG. 4, the operating piece has a substantially rectangular shape, and its upper edge is formed to form the same plane along the longitudinal direction. An engaging surface is formed at the contact surface. The operation piece 20 is attached to a stopper end 201 at a collar member 29 fixed to the cylinder casing 14.
The locking position where it touches (shown in solid line in Figure 3)
a and a release position b (indicated by a dashed line in FIG. 3) where the engaging end 202 can be disengaged from the lock hole 24. A helical spring (not shown) is attached around the operating shaft 19, and the elastic force of the helical spring always urges the stopper end 201 of the operating piece to rotate in the direction of contacting the collar member 29. .

Further, when the cab 9 is in the running position, the lever 22 depending from the bracket 15 engages the locking hole 24 at the top with the engaging end 202 of the operating piece. Then, when the cab 9 is tilted from this state, the operating piece 20 is moved at its engaging end 20.
A cam-shaped surface 203 formed on the lever 22 is pressed by the lever 22 and rotated. In this case, the operation piece 20
is rotatable from the stopper position a toward the release position b against the elastic force of a helical spring (not shown).

The operation of the lock device 7 shown in FIG. 2 will now be explained.

When the cab 9 is tilted from the normal running position (indicated by the solid line in FIG. 2) to the position of tilt angle α ₁ shown by the dashed line, first, the fixing device (not shown) is released from the cab 9. . Then, pressure oil is supplied to the hydraulic cylinder device 13 from a hydraulic motor (not shown), and the rod 16 extends upward. Then, the abutment member 18 applies a tilt operation force to the rod guide member 17. At this time, the lever 22 moves up while rotating the operating piece 20 within the operating range A. When the cab 9 tilts around the tilt pin 11 and maintains a desired tilt angle _α1 , a hydraulic circuit device (not shown) is maintained in a hydraulic lock state. At the same time, the engaging end 202 of the operating piece
It engages with the lock hole 24 of the lever corresponding to the tilt angle _α1 . In this state, an operator will perform inspection and maintenance on the engine 12 and the like. Therefore, even if an abnormality such as an oil leak occurs in the hydraulic cylinder device 13 and the oil pressure decreases, the engaging end 202 engages with the lock hole 24, so that the load from the cab 9 side is not applied to the lever. 22, it is supported by an operating piece 20 on the cylinder casing 14 attached to the vehicle body frame 10, and the return displacement of the cab 9 is reliably locked. In particular, even if the lever 22 tries to shift in a direction intersecting the direction in which the elastic force of the helical spring 23 is applied, the inner wall of the lock hole 24 will
02 and prevents slippage, resulting in high reliability during locking. On the other hand, in order to return the cab 9 holding the tilt angle α ₁ to the running position, first operate the lock release operation link 27, pull the wire 28 in the direction of arrow B, and move the operation piece 20 at the lock position a. The engaging end 202 is forcibly rotated to the release position b, and the engaging end 202 is removed from the lock hole 24. Note that if the operating piece 20 is prevented from rotating in the operating range A due to the load of the cab 9, the hydraulic cylinder device 13 is operated once to adjust the cab 9 to its tilt angle α ₁ .
You can operate it so that it increases.

In this way, by reversely operating the hydraulic cylinder device 13 with the operation piece 20 maintained at the release position b, the cab 9 can be returned to the running state position.

When locking the cab 9 at a desired tilt angle _α1 , the locking device 7 shown in FIG. . Therefore, by selecting the locking holes 24 at different upper and lower positions, the cab 9 can be locked at multiple tilt angles. In particular, there is an advantage in that the cab can be locked at a convenient tilt angle depending on the degree of inspection and maintenance of the engine, etc. Moreover, the lock hole 24 and the engaging end 2
The engagement of 02 prevents the lever 22 from shifting when the lever is locked.Furthermore, since the engagement surface and contact surface on the operating piece are formed on the same plane, the cablocked state is reliably maintained and reliability is high. .

Although the hydraulic cylinder device 13 has been described above as the tilt operation means, an air cylinder device (not shown) may be used in some cases.

[Brief explanation of the drawing]

Figure 1 is a schematic side view of a conventional locking device, Figure 2 is a schematic side view of a conventional locking device;
The figure is a side view of the main parts of a car equipped with a locking device as an embodiment of this invention, FIG. 3 is an enlarged side view of the locking device of FIG. 2, and FIG. 4 is a main part of the locking device of FIG. 2. The perspective view and FIG. 5 each show a sectional view taken along the line X--X in FIG. 3. 7... Lock device, 9... Cab, 10... Vehicle body frame, 13... Hydraulic cylinder device, 14...
...Cylinder casing, 20...Operation piece, 201
... Stopper end, 202 ... Engagement end, 22 ... Lever, 24 ... Lock hole, α ₁ ... Tilt angle, A
...Operation area, 27...Lock release operation link.

Claims (1)

[Scope of utility model registration request] A cab mechanical locking device that is attached to a tilt operation means for tilting and rotating a cab whose one end is pivotally mounted on the vehicle body frame using a power cylinder, and that locks the cab at a predetermined tilt angle. A lever is pivotally connected to the cab and has a plurality of lock holes formed in the vertical direction, and a lever is pivotally connected to the power cylinder on the vehicle body frame side via a shaft, and the lever is attached to one end with this shaft as the central part. An engaging end that engages with the lock hole through an engaging surface and a stopper end that abuts the collar of the power cylinder through substantially the same plane as the engaging surface are formed at the other end, and the engaging end an operating piece that is rotatable between a lock position where the stopper end is engaged with the lock hole and the stopper end is in contact with the collar to limit rotation, and a release position where the stopper end is disengaged from the lock hole; A biasing means for biasing the operation piece to rotate toward the lock position, and a lock release means for moving the operation piece to the release position against the urging force of the biasing means. A mechanical locking device for a cab, characterized in that when the engaging end of the operating piece engages with the locking hole, the cab is locked at a tilt angle corresponding to the vertical position of the locking hole.