JP2571337Y2 - Forklift clamping 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 clamp device for a forklift, and more particularly to an improvement of a clamp device called a bale clamp for gripping a load from both sides.

[0002]

2. Description of the Related Art FIGS. 5 and 6 show a conventional clamping device. As shown in the figure, a clamp base 23 formed in a rectangular frame shape is fixed to a finger bar 22 fixed to a lift bracket 21 that moves up and down along a mast of a forklift, and a front surface of the clamp base 23 is
Two upper and lower rail holders 24 each having a groove shape are fixed. A pair of right and left clamp arms 25 is disposed on the front surface of the rail holder 24, and the clamp arm 25 has a rail portion 26 movably attached to the rail holder 24 via a guide roller 27 and a side roller 28. The clamp cylinders 29 are arranged between the upper and lower rail holders 24 so as to be opened and closed by being moved toward and away from each other. As such a clamp device, for example, Japanese Utility Model Laid-Open No. 55-1701
No. 7 can be cited.

[0003]

By the way, a forward rotating moment acts on the clamp device due to its own weight and the load when the load is clamped. In the conventional clamping device described above, the rotational moment is
(Receiving a load in the front-rear direction) and side rollers 28 (mainly receiving a load in the vertical direction), so two types of rollers were indispensable. for that reason,
As the number of components increases, manufacturing costs increase,
There is a problem that the assembly adjustment work is troublesome and time-consuming.

[0004] In view of the above-mentioned problems, the present invention is to provide a clamp device for a forklift that is effective in reducing the number of components.

[0005]

Means for Solving the Problems In order to solve the above problems, the present invention is configured as follows. That is, a plurality of rail holders having a cross-sectional groove shape are fixed to the front surface of a clamp base that moves up and down together with the lift bracket in a substantially horizontal manner in the left-right direction at predetermined intervals vertically, and a pair of right and left clamps are attached to the rail holders. A forklift clamping device in which a rail portion of a member is movable in the left-right direction via a guide roller, wherein the rail portion of the rail holder and the clamp member is set to be inclined forward or downward, and A guide roller is rotatably mounted around an axis perpendicular to the inclined surface of the rail portion, and the guide roller has an axial end face near its circumferential surface set on the web of the rail holder along the longitudinal direction. The circumferential surface thereof rolls along the front and rear flanges of the rail holder in contact with the bulging portion. It is.

[0006]

In the forklift clamping device according to the present invention having the above-described configuration, the circumferential end face of the guide roller provided on the rail portion of the clamp member is set to the expansion of the rail holder web. The load mainly in the vertical direction is received by contacting the protrusion, and the load mainly in the front-rear direction is received by the circumferential surface of the guide roller contacting the front and rear flanges of the rail holder. That is, since the guide roller receives loads in the front-rear direction and the vertical direction, only one type of roller is required.

[0007]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be specifically described below with reference to the drawings. First, a forklift clamping device according to a first embodiment will be described with reference to a side view of FIG. 1 and a front view of FIG. As shown in the figure, a rectangular frame-shaped clamp base 3 is attached via a hook 4 to a finger bar 2 fixed to a lift bracket 1 that moves up and down along a mast (not shown) of the forklift. Four rail holders 5 each having a groove shape in cross section are horizontally and horizontally fixed to the upper and lower portions of the front surface at predetermined intervals vertically. The upper two rail holders 5 have the opening side facing downward, and the lower two rail holders 5
Are arranged with the opening side facing upward.

A pair of right and left clamp arms 6 as clamp members are arranged on the front surface of the rail holder 5, and the rail portions 7 of the clamp arm 6 are arranged corresponding to the vertical spacing of the rail holder 5, and a guide roller is provided. 8 is attached to the rail holder 5 so as to be movable in the left-right direction. The left and right clamp arms 6 are moved in the mutually approaching / separating direction by two clamp cylinders 9 horizontally arranged between the upper two rail holders 5 and the lower two rail holders 5. It is configured to be opened and closed.
One end of the clamp cylinder 9 is the clamp base 3.
And a rod side is fixed to the clamp arm 6 via a bracket 9b.

In the clamping device constructed as described above, as shown in FIG. 1, each of the rail holders 5 is set to be inclined downward and parallel to each other. In addition, the rail portion 7 that is arranged to face the opening side of the rail holder 5 is set to correspond to the inclination of the rail holder 5, that is, is set to be inclined forward and downward.

On the other hand, the guide roller 8 is mounted so as to be rotatable around an axis perpendicular to the inclined surface of the rail portion 7. At least two guide rollers 8 are provided for each rail portion 7 on the right and left sides, and the circumferential surface of the guide roller 8 is fitted into the groove of the rail holder 5 and the inner surface of the front or rear flange 5 a of the rail holder 5. , And an axial end face near the circumferential surface is in contact with a bulging portion 10 formed along the longitudinal direction on the inner surface of the web 5 b of the rail holder 5. The bulging portion 10 formed on the web 5b is set in a continuous portion with the front flange 5a for the upper two rail holders 5, and is provided on the rear flange 5a for the lower two rail holders 5. Is set to the continuous part.

The clamp device of this embodiment is constructed as described above. Therefore, the forward and backward loads of the forward rotating moment acting on the clamp arm 6 are mainly determined by the flange 5a of the rail holder 5 and the guide. It can be received by the contact portion A with the circumferential surface of the roller 8,
The vertical load can be mainly received by the contact portion B between the bulging portion 10 of the rail holder 5 and the axial end surface of the guide roller 8. That is, according to the present embodiment, since the guide roller 8 receives the load in the front-rear direction and the vertical direction, the side roller required in the conventional clamp device can be omitted.

By the way, when clamping a load by the clamp arm 6, it is preferable in terms of safety work to visually confirm the relative position between the gripping surface of the clamp arm 6 and the load. In the cargo handling operation using the clamp device, the user often holds the luggage placed on a place such as the ground that is lower than the driver's seat, and thus the operator's line of sight on the driver's seat is directed obliquely downward.

Therefore, as in this embodiment, the rail holder 5
When the rail portion 7 is formed so as to be inclined forward and downward, a forwardly inclined space is formed between the two members, so that the operator on the driver's seat can effectively use this space for confirming the front. It can be utilized, and the forward vision is improved. In FIG. 1, the visible range is indicated by oblique lines. Therefore, in the case of the conventional clamp device, it was necessary to confirm the tip of the clamp arm through the uppermost rail holder. However, according to the present embodiment, such annoyance is eliminated and workability is improved. Be improved.

Next, a second embodiment of the present invention will be described with reference to FIG. In this embodiment, the rail holder 5 and the rail portion 7 of the clamp arm 6 are each set to be inclined forward. In this case, the upper two rail holders 5
The bulging portion 10 is set near the front flange 5a, and the bulging portion 10 is set near the rear flange 5a for the two lower rail holders 5. Other configurations are the same as those of the first embodiment.

Therefore, according to this embodiment, the contact portion A between the flange 5a of the rail holder 5 and the circumferential surface of the guide roller 8 acts mainly on the clamp arm 6 in the front-rear direction, similarly to the above-described embodiment. And the contact portion B between the bulging portion 10 of the rail holder 5 and the axial end surface of the guide roller 8 can receive the load mainly acting on the clamp arm 6 in the vertical direction.

Next, a third embodiment of the present invention will be described with reference to FIG. This embodiment is applied to a pallet fork clamp, and the clamp arm 6 serving as a clamp member described in the first embodiment is a clamp fork 1
The configuration is exactly the same as that of the first embodiment except that the configuration is changed to 1. Therefore, also in this embodiment, it is possible to obtain the effect of omitting the side rollers and improving the front view when the load is clamped.
In FIG. 3, the visible range from above the driver's seat is indicated by oblique lines.

Although not shown, if necessary, for example, the upper two rail holders 5 are set to be inclined forward and the lower two rail holders 5 are set to be inclined forward. It is also possible to set it up or the reverse arrangement.

[0018]

[Effect of the Invention] As described in detail above, according to the present invention,
The side rollers required in the conventional clamping device can be omitted, which leads to a reduction in the cost of the device, as well as facilitating assembly adjustment and maintenance work.

[Brief description of the drawings]

FIG. 1 is a side view showing a forklift clamping device according to a first embodiment of the present invention.

FIG. 2 is a front view of the same.

FIG. 3 is a side view illustrating a forklift clamping device according to a second embodiment.

FIG. 4 is a side view showing a forklift clamping device according to a third embodiment.

FIG. 5 is a perspective view showing a conventional clamping device.

FIG. 6 is a side view showing a conventional clamping device.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Lift bracket 3 ... Clamp base 5 ... Rail holder 5a ... Flange 5b ... Web 6 ... Clamp arm 7 ... Rail part 8 ... Guide roller 10 ... Swelling part

Claims (1)

(57) [Scope of request for utility model registration] 1. A plurality of rail holders each having a groove shape in cross section are fixed to a front surface of a clamp base which moves up and down together with a lift bracket in a substantially horizontal manner at predetermined intervals vertically and horizontally. A forklift clamp device in which rail portions of a pair of clamp members are movable in a left-right direction via a guide roller, wherein the rail holder and the rail portions of the clamp member are set to be inclined forward or downward. The guide roller is mounted rotatably about an axis perpendicular to the inclined surface of the rail portion, and the guide roller has an axial end face near its circumferential surface along the longitudinal direction of the web of the rail holder. A forklift having a configuration in which a circumferential surface thereof rolls along a flange of the rail holder in a state of contacting the set bulging portion. Clamping device.