JPH0971269A - Stopper device for cab tilt - Google Patents

Abstract

PROBLEM TO BE SOLVED: To secure the durability of a cable, and concurrently materialize an inexpensive structure small in size. SOLUTION: A pivot supporting bracket 19 is fixed to a cylinder 4, and a lock lever 16 is rotatably pivoted to the pivot supporting bracket 19 by a first pivot 20. A lock releasing lever 23 is also pivoted to the pivot supporting bracket 19 by a second pivot 21. The lock lever 16 is endowed with resilient force toward a support member 5 by a first twisting coil spring 28. And resilient force in the direction parting from the arm receiving part 25 of the lock lever 16 is given to the lock releasing lever 23 by a second twisting coil spring 31.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION The stopper device for a cabot according to the present invention is incorporated in a cabot device of a cab-over type automobile such as a truck to prevent the cab from descending when the telescopic actuator fails.

[0002]

2. Description of the Related Art In the case of a cab-over type automobile in which an engine is provided at a front end of a chassis and a cab (a box having a passenger space including a driver's seat) is provided above the engine, in order to enable engine maintenance, It is necessary to tilt the cab forward (swing displacement). For this reason,
As shown in FIG. 7, the front end of the chassis 1 (the left end in FIG. 7) and the lower surface of the front of the cab 2 (the left part in FIG. 7) are supported by a tilt shaft (not shown) so that they can be tilted. An extensible actuator is provided between the cab 2 and the cab 2. As shown in FIG. 7, when the engine is exposed from the cab 2 for maintenance of the engine, as shown in FIG.
Is extended and the cab 2 is tilted forward. On the other hand, in the normal state, the hydraulic actuator 3 is contracted and the cab 2 is lowered to be in the upright state.

A stopper device is attached to such a cavitating device in order to ensure the safety of an operator who performs the above-mentioned maintenance and the like, and even when the hydraulic actuator 3 fails,
It is necessary to prevent the cab 2 from being lowered carelessly (not returning from the tilted state shown in FIG. 7 to the upright state).
For this reason, a stopper device as described in, for example, Japanese Utility Model Laid-Open No. 5-64047 is conventionally known. FIG.
Shows an apparatus described in this publication.

A base end portion (lower end portion) of a cylinder cylinder 4 which is a casing constituting the hydraulic actuator 3 is mounted on the upper surface of the chassis 1 (FIG. 7) by a support shaft (second support shaft) parallel to the tilt shaft. Support swingably. Also, the tension member 5
The base end portion (upper end portion) of the piston is configured by the support shaft (first support shaft) parallel to the tilt axis together with the tip end portion (upper end portion) of the piston rod (not shown) that constitutes the hydraulic actuator 3 together with the cylinder cylinder 4. , The lower part of the cab 2 (FIG. 7) is swingably supported. The strut member 5 is displaceable along the cylinder tube 4. Further, a plurality of locking notches 10 and 10 are formed on the edge of the locking plate portion 9 which constitutes the pulling member 5.

Further, a pivot bracket 6 is pivotally supported on a portion of the outer peripheral surface of the cylinder cylinder 4 opposite to the tension member 5 (left side in FIG. 8). The intermediate portion of the lock lever 7 is pivotally supported by the pivot bracket 6. A tension spring 8 is provided between the lock lever 7 and the cylinder cylinder 4, and a locking portion 11 formed at the tip of the lock lever 7 is pressed toward the tension member 5.

In order to perform maintenance work, the cab 2
Is tilted, the tension member 5 is displaced upward. Then, when the cab 2 is completely tilted, the lower end surface of the tension member 5 moves to above the locking portion 11, and the locking portion 11 enters the lower side of the tension member 5. Therefore, even if the hydraulic actuator 3 fails, the cab 2 does not descend. After work,
In order to lower the cab 2, the cable 12 coupled to the base end of the lock lever 7 is pulled, and the locking portion 11 is pulled.
Is retracted from below the tension member 5, and then the hydraulic actuator 3 is contracted. The plurality of locking notches 10 and 10 engage with the locking portion 11 when the hydraulic actuator 3 fails during expansion.

[0007]

In the conventional stopper device for a cavitt constructed as described above, when the hydraulic actuator 3 is extended, the engaging portion 11 is provided with the engaging cutout 1.
The lock lever 7 swings every time it faces 0 and 10, and the cable 12 is pushed and pulled. Therefore, this cable 12
In order to secure the durability of the cable 12, it is necessary to use a thicker cable 12 than necessary. Making the cable 12 thick not only causes a cost increase, but also has an inconvenience that the arrangement direction is restricted due to an increase in bending rigidity and the degree of freedom in design is reduced.

[0008] In view of such circumstances, the actual Kaihei 1-138
In Japanese Patent No. 872, a lock lever that engages and disengages with a tension member and a lock release lever that disengages the lock lever from the tension member are separate bodies, and the tip end of the lock release lever is elastic toward the casing. The structure to which is added is described. In the case of this improved structure, the force is transmitted only from the lock release lever to the lock lever, and the force is not transmitted from the lock lever to the lock release lever. Therefore, when the telescopic actuator is extended, the cable coupled to the base end of the lock release lever is not pushed or pulled, and the diameter of the cable can be reduced.

By the way, in the case of the improved stopper device for cavitts, a tension spring for urging the lock lever toward the tension member is provided at a portion laterally protruding from the lock lever and the casing. There is. For this reason, not only the number of parts required to install the tension spring and the number of assembly steps increase, which not only increases the manufacturing cost but also increases the installation space and impairs the degree of freedom in design in terms of preventing interference with other parts. Be done. The same problem also occurs in the tension spring that gives the tip of the lock release lever an elastic force toward the casing. If the spring attached to the lock lever and the lock release lever is a torsion coil spring instead of the tension spring, the above problem can be solved, but in the case of the improved stopper device for the cavitt,
It is difficult and practically impossible to provide a torsion coil spring due to its structure.

The cavitating stopper device of the present invention has been invented in view of the above circumstances, and enables the diameter of a cable for unlocking to be reduced, and the structure can be simplified and miniaturized by incorporating a torsion coil spring. It realizes a possible structure.

[0011]

A stopper device for a cavitt according to the present invention comprises a bracing member and a casing. The bracing member among them is made by press-forming a steel plate having sufficient rigidity, for example. The base end portion of the strut member is swingably supported by one of a chassis and a cab tiltably supported on the upper surface of the chassis by a tilt shaft by a first support shaft parallel to the tilt shaft.
The casing together with the rod constitutes a telescopic actuator. The base end portion of such a casing is swingably supported by the other of the chassis and the cab by a second support shaft parallel to the tilt shaft.

The strut member also includes a pair of locking plate portions having a U-shaped cross section and parallel to each other. A plurality of locking notches are formed at the positions of the edges of each locking plate that are aligned with each other.

On the other hand, a guide plate is provided on the outer peripheral surface of the distal end portion of the casing by welding or screwing with a guide space formed between the inner peripheral surface of the guide plate and the outer peripheral surface of the casing. It is fixed. Then, the tension member is freely inserted into the guide space so as to be displaced in the length direction.

A pivot bracket is fixed to the outer peripheral surface of the casing at a position diametrically opposite to the guide space by welding or screwing. The pivot bracket supports first and second pivots that are parallel to the tilt axis and are spaced apart from each other in the axial direction of the casing.

An intermediate portion of the lock lever is pivotally supported by a first pivot shaft supported near the tip of the casing, and an intermediate portion of the lock release lever is pivotally supported by a second pivot shaft provided near the center of the casing. .

Further, a pair of locking portions that can be engaged with the leading end surface of the tension member and the locking notches are provided at the leading end of the lock lever that is located near the leading end of the casing. . Similarly, at the base end of this lock lever,
A receiving arm portion is provided that extends in a direction opposite to the locking portion with respect to the first pivot. Further, a first torsion coil spring is provided between the lock lever and the pivot bracket to press the locking portion toward the tension member.

One end of the lock release lever is opposed to the receiving arm, and the other end of the lock release lever is connectable to the end of the cable. Further, a second torsion coil spring having elasticity in a direction of separating one end of the lock release lever from the receiving arm is provided between the lock release lever and the pivot bracket.

[0018]

The stopper device for the cavitt according to the present invention constructed as described above can reduce the diameter of the cable for unlocking similarly to the structure described in Japanese Utility Model Laid-Open No. 1-138872. In particular, in the case of the cavitating stopper device of the present invention, by incorporating the first and second torsion coil springs, a structure that can be simplified and downsized can be realized.

[0019]

1 to 6 show an embodiment of the present invention. The cavitating stopper device of the present invention is similar to the conventional cavitating stopper device described above, and the tension member 5
And a cylinder cylinder 4 which is a casing. The bracing member 5 among them is made by press forming a thick steel plate having a thickness of, for example, about 5 to 7 mm. This thickness is determined by design according to the size of the track to which the stopper device is attached (particularly the weight of the cab 2 (FIG. 7)). An upper end portion which is a base end portion of the strut member 5 has a cab 2 which is tiltably supported on the upper surface of the chassis 1 (FIG. 7) by a tilt shaft.
It is swingably supported by a first support shaft (not shown) parallel to the tilt shaft at the lower part of the.

Further, the cylinder cylinder 4 constitutes a hydraulic actuator 3 which is a telescopic actuator, together with a built-in piston (not shown) and a piston rod 13 whose base end is connected to the piston. The lower end, which is the base end of the cylinder tube 4, is swingably supported on the upper surface of the chassis 1 by a second support shaft (not shown) parallel to the tilt shaft.

Further, the tension member 5 is provided with a pair of locking plate portions 9, 9 having a U-shaped cross section and parallel to each other. And
A plurality of locking notches 10, 10 are formed at positions where the edges of the locking plate portions 9 are aligned with each other. Each of these locking notches 10 and 10 has a lower portion formed as an inclined edge 14 and an upper portion formed as a right-angled edge 15,
Only when the tension member 5 tends to descend, engage with the locking portions 11, 11 of the lock lever 16 described later,
The strut member 5 is prevented from descending. In other words, when the bracing member 5 rises, the locking portions 11, 11 and the locking notches 10, 10 do not engage with each other, and the lifting of the bracing member 5 is not hindered.

On the other hand, a guide plate 17 is fixed to the outer peripheral surface of the upper end which is the other end of the cylinder cylinder 4 by welding. The guide plate 17 is also made by bending a thick steel plate and has a substantially C-shaped cross section. The guide plate 17 is welded and fixed to the outer peripheral surface of the cylinder cylinder 4 at both ends thereof.
A guide space 18 is formed between the inner peripheral surface of the cylinder and the outer peripheral surface of the cylinder cylinder 4. The bracing member 5 is freely inserted into the guide space 18 so as to be displaced in a diagonally vertical direction which is the length direction.

A pivot bracket 19 is welded and fixed to the outer peripheral surface of the cylinder cylinder 4 at a position diametrically opposite to the guide space 18 (on the left side in FIGS. 1 to 4 and 6). The pivot bracket 19 is also formed in a U-shaped cross section by bending a steel plate having sufficient rigidity. Then, the pair of support plate portions 22 and 22 which are parallel to each other and constitute the pivot bracket 19 are provided with first and second pivots 20 and 21 which are parallel to the tilt axis.
Both end portions of the cylinder cylinder 4 are supported by being separated from each other in an obliquely vertical direction which is the axial direction of the cylinder tube 4.

Of the first and second pivot shafts 20 and 21, the first pivot shaft 20 supported near the top end of the cylinder cylinder 4 is pivotally supported by the intermediate portion of the lock lever 16. . Further, a lock release lever 23 is provided on the second pivot 21 provided near the center of the cylinder tube 4 at the lower side.
The central part of the.

The lock lever 16 includes a main portion 24 having a U-shaped cross section formed by bending a steel plate having sufficient rigidity, and an upper end portion which is a base end portion on one side of the main portion 24. Is fixed by welding. By inserting both ends of the first pivot shaft 20 into circular holes 27, 27 formed at the lower ends of the pair of left and right flat plate portions 26, 26 constituting the main portion 24, the main portion 24
Is pivotally supported on the pivot bracket 19. Further, the locking portions 11 and 11 are extended toward the tension member 5 from the upper end tip edges of the pair of flat plate portions 26 and 26, respectively. Furthermore, the receiving arm portion 25 is engaged with the first pivot 20 from the lower outer surface of any one of the flat plate portions 26 by the locking portion 1.
It extends downward, which is the opposite direction to 1 and 11, and projects outward (to the right in FIG. 5) from the outside surface (to the right in FIG. 5) of the flat plate portion 26. Further, a first torsion coil spring 28 is provided between the lock lever 16 and the pivot bracket 19. The coil portion of the first torsion coil spring 28 is arranged around the first pivot 20.
Further, one end of the first torsion coil spring 28 elastically abuts on the bottom plate 29 of the pivot bracket 19, and the other end elastically abuts on the lower end edge of the connecting plate 30 constituting the lock lever 16. ing. Therefore, this first torsion coil spring 2
8 elastically presses the locking portions 11, 11 toward the strut member 5.

On the other hand, one end portion (lower end portion in the state of FIG. 1) of the lock release lever 23 faces the receiving arm portion 25. Further, the other end of the lock release lever 23 (the upper end in the state of FIG. 1) can be freely connected to the end of the cable 12. Further, a second torsion coil spring 31 is provided between the lock release lever 23 and the pivot bracket 19. The coil portion of the second torsion coil spring 31 is arranged around the second pivot 21.
Further, one end of the second torsion coil spring 31 is at the lower end edge of the bottom plate portion 29 of the pivot bracket 19, and the other end is at the lower end edge of the bent step portion 32 formed in the middle portion of the lock release lever 23. , Are in elastic contact with each other. Therefore, the second torsion coil spring 31 is
One end of 3 is pressed in the direction of separating it from the receiving arm 25.

In the cab-over type truck additionally provided with the stopper device for cabult of the present invention constructed as described above, when the hydraulic actuator 3 is extended and the cab 2 is tilted in order to perform maintenance work of the engine and the like, the above-mentioned tension member is provided. 5 is displaced upward in the order shown in FIGS. 6 (A) to 6 (C). At this time, the lock lever 16
Are the locking notches 10 and 10 and the locking portions 11 and 11
6 and the state in which the locking notches 10 and 10 and the locking portions 11 and 11 are disengaged (the state in FIG. 6A). repeat. However, even if the lock lever 16 repeatedly swings in this manner, the lock release lever 23 does not swing in a state where the bent step portion 32 abuts against the leading edge of any one of the flat plate portions 26. . Therefore, the cable 12 coupled to the other end portion of the lock release lever 23 is not pushed and pulled, and the cable 12 is not particularly increased in diameter.
The durability of can be sufficiently secured.

When the hydraulic actuator 3 is fully extended and the cab 2 is completely tilted, as shown in FIG.
As shown in FIG. 5, the lower end surface of the tension member 5 moves to a position above each of the locking portions 11 and 11, and each locking portion 1
1, 11 enter the lower side of the bracing member 5. Therefore,
Even if the hydraulic actuator 3 fails, the cab 2 does not descend. If the hydraulic actuator 3 fails during expansion, the plurality of locking notches 1
By engaging any one of 0 and 10 with the locking portions 11 and 11, the cab 2 is prevented from being lowered inadvertently.

After the work is completed, in order to lower the cab 2, the cable 12 connected to the base end of the lock release lever 23 is pulled. Then, as shown in FIGS. 4A and 4B, the lock release lever 23 is swung against the elastic force of the second torsion coil spring 31, and one end of the lock release lever 23 receives the arm of the lock lever 16. The part 25 is pressed. Then, the lock lever 16 is swung against the elastic force of the first torsion coil spring 28, and the locking portions 11, 11 are retracted from below the tension member 5. In this state, the hydraulic actuator 3 is contracted to lower the cab 2.

In the case of the stopper device for the cavitt according to the present invention, the first torsion coil spring 28 is urged to urge the lock lever 16, and the second torsion coil spring 31 is urged to urge the lock release lever 23. I am using each. Unlike the case where tension springs are used to urge the levers 16 and 23, it is not necessary to use brackets to mount the torsion coil springs 28 and 31. Also, the spring for urging does not project laterally.

In the above description, an example in which a hydraulic actuator is used as the telescopic actuator has been described, but the telescopic actuator does not necessarily have to be hydraulic. For example, an electric actuator incorporating an electric motor and a feed screw mechanism may be used.
It is also possible to turn the installation direction upside down so that the lower end of the tension member 5 is pivotally supported on the upper surface of the chassis 1 and the upper end of the casing such as the cylinder tube 4 is pivotally supported on the lower part of the cab 2.

[0032]

Since the stopper device for the cavitt according to the present invention is constructed and operates as described above, a small diameter cable is used as the unlocking cable, and the structure is simplified by incorporating the torsion coil spring. , Downsizing is possible. As a result, it is possible to realize an inexpensive stopper for a cavitt which has a high degree of freedom in design.

[Brief description of drawings]

FIG. 1 is a side view of an essential part showing an embodiment of the present invention.

FIG. 2 is a cross-sectional view taken along the line AA of FIG. 1 in which a bracing member is omitted.

FIG. 3 is a cross-sectional view taken along line BB of FIG. 1, in which a tension member and a lock lever are omitted.

FIG. 4 is a side view showing a state in which the lock release lever and the lock lever are swung in order of the stroke in order to lower the cab.

FIG. 5 is a diagram of FIG. 4B viewed from the left.

FIG. 6 is a side view showing the behavior of the lock lever and the lock release lever when the hydraulic actuator is extended to raise the cab, in the order of strokes.

FIG. 7 is a schematic front side view of a cab-over type truck in which the cab is tilted.

FIG. 8 is a schematic side view showing an example of a conventional cavitating stopper device.

[Explanation of symbols]

 1 Chassis 2 Cab 3 Hydraulic Actuator 4 Cylinder Tube 5 Stretching Member 6 Pivot Bracket 7 Lock Lever 8 Extension Spring 9 Locking Plate 10 Locking Notch 11 Locking 12 Cable 13 Piston Rod 14 Sloping Edge 15 Right Angle 16 Lock Lever 17 Guide plate 18 Guide space 19 Pivot bracket 20 First pivot 21 Second pivot 22 Support plate part 23 Lock release lever 24 Main part 25 Receiving arm part 26 Flat plate part 27 Circular hole 28 First torsion coil spring 29 Bottom plate part 30 Connecting plate part 31 Second torsion coil spring 32 Bending step part

Claims (1)

[Claims] 1. A stopper device for a cavitt which satisfies the following requirements. One of the cab that is tiltably supported on the upper surface of the chassis by the chassis and the tilt shaft, and a tension member whose base end is swingably supported by a first support shaft parallel to the tilt shaft, and a chassis. And its base end on the other side of the cab,
A casing which is swingably supported by a second support shaft parallel to the tilt shaft and constitutes a telescopic actuator. The strut members are U-shaped in cross section and parallel to each other.
A pair of locking plate portions are provided, and a plurality of locking cutouts are formed at the positions where the edges of each locking plate portion are aligned with each other. A guide plate is fixed to the outer peripheral surface of the distal end portion of the casing in a state where a guide space is formed between the inner peripheral surface of the guide plate and the outer peripheral surface of the casing. , Is freely inserted through the length direction. A pivot bracket is fixed to the outer peripheral surface of the casing at a position diametrically opposite to the guide space, and each of the first and second pivots parallel to the tilt axis is fixed to the pivot bracket. , Are supported apart from each other in the axial direction of the casing. An intermediate portion of a lock lever is pivotally supported by a first pivot shaft supported near the tip of the casing, and an intermediate portion of a lock release lever is pivotally supported by a second pivot shaft provided near the center of the casing. At the tip of the lock lever, which is located near the tip of the casing, is provided a pair of locking portions that can be engaged with the tip surface of the tension member and the locking notches. The end portion is provided with a receiving arm portion extending in a direction opposite to the locking portion with respect to the first pivot, and the locking portion is stretched between the lock lever and the pivot support bracket. A first torsion coil spring that presses against the member is provided. One end of the lock release lever is opposed to the receiving arm, and the other end of the lock release lever is freely connectable to the end of the pulling cable. Furthermore, between the lock release lever and the pivot bracket. Is provided with a second torsion coil spring having elasticity in a direction of separating one end portion of the lock release lever from the receiving arm portion.