JPS6144550Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to an improvement of a device for preventing forward tipping of a tilting cab.

Conventionally, in a vehicle having a tilt-type cab supported by a chassis frame via an elastic member to improve riding comfort, when the cab is tilted by a power cylinder, the power cylinder tilts the cab while driving. There is a problem that hinders comfort. Therefore, one end of the power cylinder is connected to the chassis frame, and the other end is connected to the cab via a link in order to allow the cab to move up and down in the traveling position. The above-mentioned problem can be solved by configuring the cab to start tilting after coming into contact with the fixing member on the cab side.

However, as soon as the cab tilts and the cab's center of gravity moves forward from the center of tilt, the elastic member that supports the front end of the cab deforms greatly, causing the cab to suddenly fall forward, causing damage to nearby areas. There is a defect that is extremely dangerous to humans.

Therefore, a locking member such as a pin that protrudes laterally at the upper end of the power cylinder is provided, and the locking member is engaged when the inclination angle of the power cylinder with respect to the cab becomes smaller than a set value. It is possible to fix the hook to prevent the cab from tipping forward, but it is necessary to avoid interference between the hook and the locking member due to vertical displacement of the cab in the running position. The engaging portion cannot be set too large. Therefore, when the above-mentioned phenomenon of the cab tipping forward occurs at a relatively small tilt angle due to, for example, a load on the cab,
There was a problem in that there were cases in which it was not possible to prevent the phenomenon of tipping forward.

The present invention was devised in view of the above, and includes a tilt-type cab supported on a chassis frame via an elastic member, and one end of which is connected to the chassis frame and the other end of which is connected to the cab in a running position. In order to allow vertical displacement, a power cylinder for cab tilt is connected to the cab via a link, and after the link comes into contact with a fixed member on the cab side due to extension of the power cylinder, the cab tilts. In the apparatus configured to start tilting, a locking member provided at the other end of the power cylinder and a portion of the cab near the link are connected to The elastic member is supported so as to be rotatable between a first position in which the locking member does not prevent displacement and a second position in which it engages with the locking member and prevents displacement of the cab in the forward tilting direction. a foot lever biased to maintain the disengaged position;
When the cab is in the traveling position, the foot lever is moved to the first position by the biasing force of the elastic member.
When the power cylinder is extended and the distance between the link and the fixing member becomes smaller than a set value, it comes into contact with the link, and as the link is displaced, the power cylinder resists the biasing force of the elastic member. The object of the present invention is to provide a device for preventing a tilt-type cab from tipping forward, which is configured to be held at the second position.

Hereinafter, one embodiment of the present invention will be described in detail with reference to the accompanying drawings.

In the figure, 2 is the chassis frame, 4 is the cab,
6 is a cab frame forming the lower frame of the cab 4, 8 is a bracket fixed to the chassis frame 2, and 10 is attached to the cab frame 6 by a shaft member 12 at one end and the bracket 8, and at the other end by a shaft member 14. The suspension arm 16 is a spring receiving member fixed to the chassis frame 2, and 18 is a coil spring compressed between the spring receiving member 12 and the arm 10. 13 is a bridge fixed to the chassis frame 2; 15 is a spring 17 on the bridge 13;
A floating bar 19 supported by and extending in the vehicle width direction is a bracket that is fixed to the cab 4 and detachably engaged with the floating bar 15. 20 is a bracket fixed to the chassis frame 2, 22 is a bracket fixed to the cab frame 6, 24 is a link whose one end is pivoted to the bracket 22 with a shaft member 26, and 28 is a link whose upper end is connected to the shaft member 3.
0 to the other end of the link 24, and the lower end is attached to the shaft member 3.
2 are hydraulic power cylinders for cab tilt, each of which is pivotally attached to a bracket 20. and,
The link 24 is arranged so that the power cylinder 28 does not obstruct the vertical displacement of the cab 4 in the running position, and when the cab 4 is tilted, the link 24 moves to the bracket 2 due to the extension of the power cylinder 28.
It starts after contact with 2.

Reference numeral 34 designates a locking member consisting of a pin provided at the upper end of the power cylinder 28 and extending in the width direction of the vehicle, and 36 designates a hook lever rotatably supported on the bracket 22 by a shaft member 38. Same foot lever 36
is the first position (the third
) and a second position (FIG. 4) where it engages with the locking member 34 and prevents the cab 4 from falling forward. The foot lever 36 also has a pin 42 at the end opposite to the hook-shaped engaging portion 40 for the locking member 34, and is further biased clockwise in the figure by a spring 44 stretched between it and the bracket 22. When the cab 4 is in the running position, the pin 42 is brought into contact with the contact portion 46 of the bracket 22 by the biasing force of the spring 44 and held in the first position, while the power cylinder 28 is extended. After the distance between the link 24 and the bracket 22 exceeds the distance between the link 24 and the bracket 22 corresponding to the upper end of the displacement A, the contact portion 48 at the tip of the link 24 contacts the pin 42 and the spring 44 The lever lever 36 is pushed up against the urging force of the lever 36 to hold it in the second position.

According to the above configuration, when the cab 4 is in the traveling position, the foot lever 36 is in the first position where it does not inhibit the displacement of the locking member 34 due to the vertical displacement of the cab 4, and on the other hand, when the power cylinder 28 is extended and the cab 4 is When the tilt is started, the locking member 3
4, the engaging portion 40 of the foot lever 36 with respect to the locking member 34 can be set large in the second position.
In particular, even when the tilt angle of the cab 4 is relatively small, the hook lever 36 can be engaged with the locking member 34, and the forward tilting phenomenon can be prevented.

Furthermore, since the movement of the foot lever 36 between the above two positions is achieved by the biasing force of the spring 44 and the contact of the pin 42 with the bracket 22 and the link 24, the foot lever 36 can be moved separately, for example, electrically or hydraulically. This has the advantage that there are fewer failures and it can be implemented at a lower cost than when it is forced.

[Brief explanation of drawings]

FIG. 1 is a side view showing an entire embodiment of the present invention;
FIG. 2 is an enlarged view of the part shown in FIG. 1, FIG. 3 is an enlarged view of the main part of FIG. 2, and FIG. 4 is an enlarged view similar to FIG. 3 when the cab 4 is tilted. 2... Palm frame, 4... Cab, 6...
Cab frame, 10... Suspension arm, 13... Bridge, 15... Floating bar, 17, 18... Spring, 22... Bracket, 24... Link, 28... Power cylinder, 34... Locking member , 36...foot lever,
40... Engaging portion, 42... Pin, 44... Spring, 46, 48... Contact portion.

Claims (1)

[Scope of utility model registration request] A tilt-type cab is supported by the chassis frame via an elastic member, and one end is connected to the chassis frame and the other end is connected via a link to allow vertical displacement of the cab in the traveling position. and a power cylinder for cab tilt connected to the cab, and configured such that the cab starts tilting after the link comes into contact with the fixing member on the cab side due to extension of the power cylinder. , a locking member provided at the other end of the power cylinder, and a first position in a portion of the cab near the link that does not inhibit displacement of the locking member due to vertical displacement of the cab in the traveling position; It is supported so as to be rotatable to a second position where it engages with the locking member and prevents the cab from falling forward, and is biased by an elastic member to maintain the disengaged position. and a foot lever, the foot lever is held at the first position by the biasing force of the elastic member when the cab is in the traveling position, and when the power cylinder is extended, the link and the fixing member are connected. The tilt device is characterized in that when the distance becomes smaller than a set value, the tilt device contacts the link and is held in the second position against the biasing force of the elastic member along with the displacement of the link. A device to prevent the cab from tipping forward.