JP2580117Y2 - Backrest stopper structure of hinge fork device - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a hinge fork device of a forklift mainly used for loading and unloading long objects such as wood, and more particularly, to a back for restricting movement (backward tilt) of a backrest when a fork is tilted up. The present invention relates to a rest stopper structure.

[0002]

2. Description of the Related Art FIGS. 4 and 5 show a conventional hinge fork device. As shown in the drawing, a projection 3 is provided on the lower front surface of a lift bracket 2 which moves up and down along a mast 1 of a forklift. A finger bar 5 for holding and supporting a fork 4 is provided on the projection 3 via a support pin 6. It is mounted so that it can be tilted back and forth. A dump cylinder 7 is installed vertically at an intermediate portion of the lift bracket 2, and its piston rod is rotatably connected to a projection 8 protruding from a lower portion of the rear surface of the finger bar 5 by a pin 9. The fork 4 is tilted up and down, that is, dumped, as shown by the imaginary line in FIG. 4, by extending and retracting the dump cylinder 7 to tilt the finger bar 5 back and forth.

[0003] A backrest 10 for supporting the load on the fork 4 from the rear side is arranged on the finger bar 5. The backrest 10 is pivotally attached to the upper end of the finger bar 5 via a support pin 11 so as to be able to tilt back and forth, and a strong coil spring 12 is always stretched between the back bar 10 and the finger bar 5 on the back side thereof. Thus, the finger bar 5 is held almost upright with respect to the finger bar 5 which is the initial position so that the finger bar 5 does not fluctuate.

[0004] When the fork 4 is tilted upward, the backrest 10 is tilted rearward together with the finger bar 5, and a stopper 13 is provided at the upper end of the front surface of the lift bracket 2 at the middle thereof. By contacting the stopper portion 14 made of the
Thereafter, it tilts forward about the pivot point with the finger bar 5 against the coil spring 12.
Incidentally, such a hinge fork device is disclosed in, for example, Japanese Utility Model Application Laid-Open No. 58-147998 and Japanese Utility Model Application Laid-Open No. 61-725.
No. 90, and the like.

[0005]

In the above-described conventional hinge fork device, when the fork 4 is tilted upward, that is, when the finger bar 5 is tilted backward, the upper end of the backrest 10 that moves following the finger bar 5 has a mast. It is necessary to set the contact time between the stopper 13 and the stopper portion 14 so as to stop the movement of the backrest 10 at a stage before interfering with the front surface of the backrest 1. By the way, in consideration of the front view from the driver's seat, there is a demand that the height of the lift bracket 2 be set low to reduce the blind spot of the front view due to the upper end of the lift bracket 2. However, when the height of the lift bracket 2 is set low, the stopper 14 must be set at a low position. As a result, the contact position between the stopper 13 and the stopper portion 14 approaches the pivotal center of the backrest 10 with respect to the finger bar 5. Therefore, in order to avoid interference with the mast 1, the rearward projecting length of the stopper 13 is reduced. become longer. That time,
This causes a problem that the backrest 10 tilts forward after the stopper abuts, that is, the amount of forward fall is excessively large, and the volume of the cargo carried is reduced.

In view of the above-mentioned problems, the present invention provides a backrest stopper structure of a hinge fork device capable of improving the front view without increasing the amount of forward fall of the backrest. Technical issues to be solved.

[0007]

Means for Solving the Problems In order to solve the above problems, the present invention is configured as follows. In other words, the present invention provides a backrest stopper for a hinge fork device in which a finger bar for supporting a fork is pivotally attached to a lift bracket so that the backrest can be inclined forward and backward. A rear surface of the backrest, which stops a follow-up movement of the backrest with respect to the finger bar by contacting a stopper set at an upper end of the lift bracket during the upward tilt of the fork. And a contact surface of the stopper with respect to the stopper portion is set to a downwardly inclined surface.

[0008]

[0009]

In the backrest stopper structure of the hinge fork device according to the first aspect of the present invention, when the fork is tilted up, the backrest moves rearward with the rearward movement of the finger bar and the stopper. When the abutment comes into contact with the stopper portion of the lift bracket, the backrest is stopped from moving. Therefore, when the finger bar further tilts backward in this state, the backrest tilts forward around the pivot point with the finger bar. In this case, since the contact surface of the stopper with respect to the stopper portion is formed on the inclined surface that is lowered forward, the rearward displacement of the stopper is allowed by the inclined surface. As a result, the amount of forward lean of the backrest around the pivot point with the finger bar is suppressed. Therefore, even if the stopper position is set near the pivot point of the backrest, an increase in the amount of forward fall of the backrest is avoided.

[0010]

[0011]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be specifically described below with reference to the drawings. First, a first embodiment of the present invention will be described with reference to FIGS. Note that the hinge mechanism for enabling the upward and downward tilting damping operation of the fork is not different from the conventional one, and therefore, the same reference numerals as those shown in FIGS. A description will be given of a main part of the present invention, that is, a stopper structure for regulating the movement of the backrest when the fork is tilted upward.

FIG. 1 is a side view showing an entire hinge fork device according to the present embodiment, and FIG. 2 is a side view mainly showing an operation mode of a stopper structure. As shown in the figure, a pair of left and right plate-shaped stoppers 15 project rearward from the back surface of a backrest 10 that is attached to the finger bar 5 via support pins 11 so as to be able to tilt forward and backward. A plate-like stopper 16 is provided at the upper end of the front surface of the lift bracket 2.

In the present embodiment, the stopper 15 is formed on an inclined surface 15a having a rear end contact portion which is cut obliquely forward and downward, and a contact surface of a stopper portion 16 opposed thereto. Is formed on a vertical surface.

In the backrest stopper structure according to the present embodiment configured as described above, when the fork 4 is horizontal, the stopper 15 of the backrest 10 and the stopper portion 16 of the lift bracket 2 are arranged as shown in FIG. As shown in A), they face each other at a predetermined interval. In this state, when the fork 4 is tilted upward, the backrest 10 also tilts rearward following the rearward tilt of the finger bar 5. And
During the upward tilt of the fork 4, as shown in FIG. 2B, when the tip of the inclined surface 15 a of the stopper 15 comes into contact with the surface immediately before the lead of the stopper 16 of the lift bracket 2, the backrest 10 is further extended. The backward tilt is stopped.

In such a state, when the fork 4 is further tilted upward, the backrest 10 whose rearward tilt is stopped,
As the lower side moves rearward together with the finger bar 5, it tilts forward around the support pin 11 which is a pivot point with respect to the finger bar 5, and tilts forward through the standing state. In FIG. 2, since the contact surface of the stopper 15 is formed on the inclined surface 15a, as shown in FIG. 2C, the stopper 15 makes the inclined surface 15a It changes as it is.

That is, in the conventional stopper structure shown in FIG. 4, after the stopper 15 comes into contact with the stopper plate 16, the rearward displacement of the stopper 15 is completely prevented. According to this, since the movement of the stopper 15 toward the stopper portion 16 is allowed, the entire backrest 10 is moved toward the lift bracket 2 by that much. As a result, the support pin 1 of the backrest 10
The amount of forward leaning around 1, that is, the amount of forward leaning is suppressed.

From the above, the contact position between the stopper 15 and the stopper portion 16, that is, the stopper position is determined by the support pin 1.
Even if it is set closer to the first side, an increase in the amount of the backrest 10 falling forward can be avoided. Therefore, by setting the stopper position closer to the support pin 11 side,
Since the height of the lift bracket 2 can be reduced, the obstruction range of the front view by the lift bracket 2 is reduced, and the front view is improved. That is, according to the present embodiment, even if the height of the lift bracket 2 is lowered and the stopper position is lowered, the amount of the backrest 10 falling forward is not increased, and the front view is improved. Become.

Next, a second embodiment of the present invention will be described with reference to FIG. In this embodiment, while the tip of the stopper 17 of the backrest 10 is formed in an arc shape, the stopper 1 on the side of the lift bracket 2 to which the tip of the stopper 17 can abut.
In FIG. 8, a front inclined surface 18a is formed. That is, the stopper portion 18 is formed integrally with the upper end portion of the lift bracket 2, and the upper end surface thereof is formed on an inclined surface 18 a which is cut obliquely downward.

Therefore, according to this embodiment, when the fork 4 is tilted upward from the horizontal state of the fork shown in FIG. 3A, the stopper as shown in FIG. The stop 17 contacts the front lowering inclined surface 18 a of the stopper portion 18 to prevent the backrest 10 from tilting backward.
Then, when the fork 4 further tilts thereafter, when the backrest 10 tilts forward around the support pin 11, the stopper 17 is displaced rearward while sliding on the inclined surface 18a of the stopper portion 18. As a result, the entire backrest 10 is shifted rearward, and the amount of forward lean around the support pin 11 is suppressed. Therefore, also in this case, it is possible to improve the front field of view without increasing the amount of forward lean of the backrest 10 as in the case of the first embodiment.

In the second embodiment, the stopper 17
A roller is attached to the rear end portion of the
8a may be a rolling contact, in which case wear of the contact surface can be reduced. Further, the stopper portion 18 may be constituted by a plate as in the case of the first embodiment.

[0021]

[Effect of the Invention] As described in detail above, according to the present invention,
This makes it possible to improve the front view without increasing the amount of forward fall of the backrest when the fork is tilted upward, thereby increasing the cargo holding volume and allowing the driver to better adjust the fork portion than before. It has excellent effects such as confirmation.

[Brief description of the drawings]

FIG. 1 is a side view of a hinge fork device according to a first embodiment of the present invention.

FIGS. 2A and 2B are side views showing the operation mode of the stopper structure of the backrest, where FIG.
Indicates the middle of the fork upward tilt, and (C) indicates the fork final upward tilt.

FIGS. 3A and 3B are side views showing an operation mode of the stopper structure according to the second embodiment, where FIG.
Indicates the middle of the fork upward tilt, and (C) indicates the fork final upward tilt.

FIG. 4 is a side view of a conventional hinge fork device.

FIG. 5 is a front view of the same.

[Explanation of symbols]

 2 ... Lift bracket 4 ... Fork 5 ... Finger bar 6 ... Support pin 10 ... Backrest 11 ... Support pin 15, 17 ... Stopper 15a ... Inclined surface 16, 18 ... Stopper portion 18a ... Inclined surface

Claims (1)

(57) [Scope of request for utility model registration] 1. A backrest stopper structure of a hinge fork device in which a finger bar for supporting a fork is pivotally attached to a lift bracket so as to be able to lean forward and backward, and a backrest is pivotally attached to the finger bar so as to be able to lean forward and backward. On the back surface of the backrest, a stopper for stopping a follow-up movement of the backrest with respect to the finger bar by contacting a stopper portion set at an upper end of the lift bracket during the upward tilt of the fork. A backrest stopper structure of the hinge fork device, wherein a contact surface of the stopper with respect to the stopper portion is set to a downwardly inclined surface.