JP2666678B2 - Clamping device for cargo handling vehicles - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a clamping device for a cargo handling vehicle, and more particularly, to a connection structure between a pair of long arms.

[0002]

2. Description of the Related Art Conventionally, this kind of technology has been
A clamp device for a cargo handling vehicle disclosed in US Pat.

According to the clamp device for a cargo handling vehicle, a boss is fixed to one long arm of a pair of long arms for clamping which are rotatably arranged in parallel. Further, the other long arm is provided with a cylindrical stopper at a position facing the boss. By inserting this boss into the stopper, the pair of long arms for clamping are engaged with each other. At this time, a predetermined gap is formed between the boss and the stopper, and the pair of long arms moves while allowing a certain range of displacement between the pair of long arms. That is, the pair of long arms can reliably grip the object to be gripped.

[0004] A similar technique is disclosed in Japanese Utility Model Laid-Open Publication No. 59-71295.
Are also disclosed.

[0005]

By the way, there is a problem that a worker operating this cargo-handling vehicle has a narrow field of view from a pair of clamping arms, resulting in poor visibility.

Therefore, in order to widen the field of view of the worker, it is conceivable to increase the length of the boss and widen the gap between the clamping arms. However, there is a problem in that the moment applied to the boss increases, which is impossible due to the strength of the boss. Further, the same problem occurs even if the length of the stopper is increased.

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and an object of the present invention is to compensate for the strength of a member to be connected and to provide a pair of clamp arms rotatably arranged side by side. It is an object of the present invention to provide a cargo handling vehicle clamping device that can increase the interval and improve the visibility of an operator.

[0008]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, a pair of long arms juxtaposed at a predetermined distance from one side of a frame are rotatably attached to one side of the frame. In a clamping device for a cargo handling vehicle, a short arm facing the long arm is attached to the other side, and a hydraulic cylinder is interposed between the long arm and a frame to rotate the long arm. It is a gist of the present invention that a connected member is formed on the opposite side of the long arm, and a connecting member that loosely fits with the connected members and connects the connected members to each other is provided.

[0009]

Therefore, according to the present invention, since the two connected members are loosely fitted to the connecting member, the pair of long arms rotate while allowing a certain range of deviation from each other.

At this time, by providing the connecting member between the pair of long arms, the interval between the long arms is widened without particularly changing the length of the connected member, and the visibility of the worker is improved. Further, since the distance between the long arms can be widened while keeping the length of the connected member short, the worker can reduce the moment applied to the connected member and compensate for the strength of the connected member. Visibility improves.

[0011]

DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will now be described with reference to FIGS.
This will be described with reference to FIG. As shown in FIG.
A tilt cylinder 3 is attached to a front portion of the body 2 and supports the outer mast 4 so as to be tiltable in the front-rear direction.
An inner mast 5 is provided inside the outer mast 4 so as to be able to move up and down as the lift cylinder 6 expands and contracts. A lift bracket 7 is supported by the inner mast 5 so as to be able to move up and down while being suspended from a chain (not shown) connected to the lift cylinder 6. A turning shaft 8 protrudes from the front surface of the lift bracket 7, and a turning plate 8 a is attached to the tip of the turning shaft 8. The rotating shaft 8 is rotated by a known rotating means (not shown) provided on the lift bracket 7.

As shown in FIGS. 1 and 2, revolving frames 9a and 9b as a pair of left and right (up and down in FIG. 3) frames are fixedly provided side by side on the rotating plate 8a. One side of each of the revolving frames 9a and 9b has a columnar rotating shaft 10
a and 10b are rotatably inserted at right angles to the longitudinal direction of the revolving frames 9a and 9b, respectively. At this time, the rotating shafts 10a, 10b are
b protrudes from both sides, and the protruding portions form protrusions 11a and 11b as connected members.

The bases of the long arms 12a and 12b are rotatably supported by the protrusions 11a and 11b, respectively. Plate-like plates 13a, 13b are fixed to the long arms 12a, 12b with bolts 14a, 14b, and the plates 13a, 13b
a and 11b. Therefore, the long arm 1
2a and 12b are fixed to the rotating shafts 10a and 10b, and rotate integrally with the rotating shafts 10a and 10b, respectively.
Note that the protruding portions 11a and 11b are
It is in a state of projecting further to both sides than b.

Further, support shafts Aa, Ab are attached to support blocks Ba, Bb fixed on one side rear surfaces of the revolving frames 9a, 9b. Further, the rotation shaft 10 is located substantially at the center of the long arms 12a and 12b from the base end to the tip.
Column-shaped fixed shafts 15a and 15b are respectively fixed in parallel with a and 10b. The fixed shafts 15a, 15b protrude on both sides of the long arms 12a, 12b, and the protruding portions are formed as protruding portions 16a, 16b as connected members.
Is formed. That is, the fixed shafts 15a and 15b are fixedly engaged with the long arms 12a and 12b by the plates 18a and 18b fixed to the long arms 12a and 12b by bolts 17a and 17b.

A hydraulic cylinder 19a, 19b is provided between the support shafts Aa, Ab and the fixed shafts 15a, 15b.
b is attached. That is, the hydraulic cylinders 19a, 19
The base ends of the cylinders 20a and 20b are rotatably attached to the support shafts Aa and Ab, respectively, and the distal ends of the piston rods 21a and 21b are fixed to the fixed shafts 15a and 15b.
5b is rotatably attached to each. Therefore, by extending and retracting the piston rods 21a and 21b, the long arms 12a and 12b are rotated by the rotating shafts 10a and 10b.
It is designed to rotate about the turning frame 9a, 9b with respect to b. That is, the piston rods 21a,
By pushing the 21b toward the distal end, the long arms 12a and 12b rotate around the rotation shafts 10a and 10b in the contracting direction (the anti-X direction in FIG. 3). In addition, when the piston rods 21a and 21b are retracted in the proximal direction, the piston rods 21a and 21b rotate in the expanding direction (X direction in FIG. 3).
Further, the distal ends of the long arms 12a and 12b have
The holding members 22a and 22b are respectively attached.

In the pair of long arms 12a, 12b, projecting portions 11a, 1
A joint 23 as a connecting member shown in FIG. 4 is connected between the portions 1b and between the protrusions 16a and 16b. That is, the long arms 12a and 12b are held in a state where they are separated by the length of the cylindrical portions 23a and 23b. The joint 23 has a cylindrical tubular portion 23a, 23
b and a connecting plate 23c for connecting the cylindrical portions 23a and 23b. Then, the protrusion 1 is attached to the cylindrical body 23a.
1a and 11b are inserted, and the protrusion 16 is inserted into the cylindrical body 23b.
a and 16b are inserted. At this time, the cylindrical body 23a
Are fitted to the protruding portions 11a and 11b without any gap. Further, the cylindrical body 23b is provided with the protrusions 16a, 16b.
Are fitted with a gap S therebetween.

Therefore, the pair of long arms 12a, 12a
b can be rotated around the rotation shafts 10a and 10b in a state where they are displaced from each other within an allowable range of the gap S, and the displacement caused by the mutual rotation of the long arms 12a and 12b is restricted. That is, the long arms 12a, 12b
When a circular work is gripped by the above, even if the diameters of the parts gripped by the long arms 12a and 12b are different from each other, if the difference between the diameters is within the allowable range of the gap S, the work is reliably gripped. It has become.

FIG. 5 shows a hydraulic cylinder 19 for rotating the long arms 12a and 12b formed as described above.
2 shows a hydraulic circuit for supplying oil to a and b.

At this time, the hydraulic cylinders 19a and 19b are supplied with oil from an oil tank (not shown). That is, the first oil pipe 24 and the second oil pipe 25 are connected to the oil tank. First
Of the oil pipe 24 is branched at a substantially central portion.
a, 24b and branch pipes 24a, 24b
Are hydraulic cylinders 19a, via check valves 26a, 26b.
19b is connected to the base end side. That is, the check valves 26a and 26b are opened when the oil from the oil tank flows toward the hydraulic cylinders 19a and 19b. When the oil flows from the hydraulic cylinders 19a and 19b toward the oil tank, the oil tank is closed.
That is, the oil is usually supplied from the oil tank to the hydraulic cylinder 1
It flows in the direction to 9a and 19b. or,
The second oil pipe 25 branches at a substantially central portion to form a branch pipe 25.
a, 25b and branch pipes 25a, 25b
Are connected to the distal ends of the hydraulic cylinders 19a and 19b, respectively. At this time, when the oil flows through the branch pipes 25a and 25b, the check valves 26a and 26b are opened based on the pressure generated by the flow of the oil.

That is, when oil is supplied to the first oil pipe 24, the check valves 26a and 26b are opened, and
Oil is supplied to the base ends of the hydraulic cylinders 19a and 19b. Therefore, the piston rod 2
1a and 21b are pushed out in the direction of the tip. When oil is supplied to the second oil pipe 25, the hydraulic cylinders 19a, 19b are supplied via the branch pipes 25a, 25b.
b. Therefore, the piston rod 2
1a and 21b are adapted to be drawn in the proximal direction. At this time, the check valves 26a, 26b are connected to the branch pipes 25a,
The oil flows into 25b and a pressure is generated, so that it is opened. Therefore, the oil supplied to the base end flows into the oil tank via the branch pipes 24a and 24b.

A pair of short arms 27a and 27b facing the long arms 12a and 12b are rotatably mounted on the other of the revolving frames 9a and 9b. The short arms 27a, 27b have hydraulic cylinders 28a, 2 like the long arms 12a, 12b.
8b are provided respectively, and this hydraulic cylinder 28
a and 28b are rotated by expansion and contraction. A gripping member 29 is attached to the distal ends of the short arms 27a and 27b while connecting the distal ends. At this time, the short arms 27a and 27b are integrally rotated by the holding member 29. That is, the short arms 27a and 27b rotate around the base ends in the contracting direction (the Y direction in FIG. 3) and the expanding direction (the Y direction in FIG. 3) in accordance with the expansion and contraction of the hydraulic cylinders 28a and 28b. It has become.

In the clamping device for a cargo-handling vehicle configured as described above, the rotating shafts 10a and 10b and the fixed shafts 15a and 15
protruding portions 11a, 11b, 16a, 16b
Since the joint 23 is connected to the second arm 23, the distance between the long arms 12a and 12b can be increased by the length of the joint 23, and the visibility can be improved. At this time, the protrusions 11a, 11
b, 16a, 16b may be short, and the protrusions 11
a, 11b, 16a, 16b can be reduced, and the protrusions 11a, 11b, 16a,
16b can be compensated for.

Further, the present clamp device can be driven by the same hydraulic circuit as the clamp device of the type shown in the prior art, in which the boss is inserted into the stopper, and the effect is obtained that the compatibility is excellent.

It should be noted that the present invention is not limited to the above embodiment, and the configuration may be appropriately changed without departing from the spirit of the invention. (1) In the above embodiment, as shown in FIG. 6, the boss 30 is attached to the surfaces of the pair of long arms 12a and 12b facing each other, and the cylindrical body 23b of the joint 23 is inserted through the boss 30. You may. At this time, a gap S is formed between the boss 30 and the cylindrical body 23b.

(2) In the above embodiment, the short arm 2
7a and 27b are rotated integrally, but by adopting the same structure as the long arms 12a and 12b, the short arms 27a and 27b can be rotated in a state where they are displaced from each other under a certain limitation. May be. Further, the short arms 27a and 27b may be constituted by one arm. Further, the short arm composed of the short arms 27a and 27b and the single short arm may be fixed to the turning frame so as not to rotate.

(3) In the above embodiment, the joint 23 as the connecting member may be constituted only by the cylindrical portion 23b.

[0027]

As described above in detail, according to the present invention, the strength of the connected member can be compensated, and the interval between the pair of rotatable clamping arms can be increased. There is an excellent effect that the visibility of the worker can be improved.

[Brief description of the drawings]

FIG. 1 is a perspective view showing a clamp device including a long arm and the like in an embodiment embodying the present invention.

FIG. 2 is a sectional view showing a state in which a long arm is rotatably attached to a revolving frame in one embodiment.

FIG. 3 is a side view showing the cargo handling vehicle in one embodiment.

FIG. 4 is a perspective view showing a joint in one embodiment.

FIG. 5 is a hydraulic circuit diagram of a long arm in one embodiment.

FIG. 6 is a cross-sectional view showing another example in one embodiment.

[Explanation of symbols]

9a, 9b ... revolving frame as a frame, 12a,
12b: long arm, 27a, 27b: short arm, 16a, 16b: projecting portion as connected member, 19
a, 19b: Hydraulic cylinder, 23: Joint as a connecting member.

Claims (1)

(57) [Claims] 1. A pair of long arms arranged side by side at a predetermined interval on one side of a frame are rotatably mounted, and a short arm facing the long arm is mounted on the other side of the frame. In a clamping device for a cargo handling vehicle in which a hydraulic cylinder is interposed between the long arm and a frame to rotate the long arm, connected members are formed on opposite sides of the pair of long arms. As well as loosely fitting with both connected members,
A clamping device for a cargo handling vehicle, comprising: a connecting member that connects the two connected members to each other.