JPH10236762A - Clamp - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a clamp fixed so as to prevent a clamping mechanism, energized in a clamping direction by a spring member, from turning in a release direction. SOLUTION: This clamp is constituted so as to comprise a clamping mechanism, formed by a main unit 2 having a fixed clamping part 5, hoist lever 9 guided by this main unit, and a movable clamping part 14 of cam-shaped clamping member connected to this hoist lever, lock mechanism associated with this clamping mechanism, and a release mechanism 24 releasing this lock mechanism. Here, in order to impede turning in a release direction of a release lever 25 of the release mechanism, a safety lever 35 is provided, which, by a spring member 39 supported turnably to the main unit also with one end mounted in the main unit, is energized so as to come into contact with a lower end part of the release lever 35. Further, by a guide part 42, a moving range of the safety lever is limited.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a clamp applied when a long steel material is lifted and moved.
A pair of side plates, a main body having a fixed holding portion fixed to one of the side plates, a lifting rod that is movable by engaging with a guide part of the main body, and a connecting rod connected to the lifting rod; A clamping mechanism comprising a cam-shaped clamping member rotatably supported by a support shaft such that one end thereof is pivotally connected to the connecting rod and the other end forms a movable clamping portion, and the clamping mechanism is maintained in a clamping state. A locking cam member fixed to a rotating shaft supported by the main body, a stopper for stopping the rotation of the locking cam member at a locking position, and a locking cam for the stopper. The present invention relates to a clamp including a locking mechanism including a spring member for urging a member, and a release mechanism including a release lever fixed to a rotation shaft of a locking cam member of the locking mechanism.

[0002]

2. Description of the Related Art Conventionally, this kind of clamp is suitable for gripping a tubular or rod-like long steel material, and is used when a long steel material is lifted and moved by a crane. In this type of clamp, in order to prevent the steel material gripped between the fixed holding portion and the movable holding portion from detaching from the holding portion, a closing arm that closes the opening of the holding portion in conjunction with the release lever is provided. The ones that have been provided are already known (Jiko 63-20
703).

[0003]

However, the cause of the accident in this type of clamp is that the steel material falls off due to the collision of the gripped steel material or the like. That is, in this type of locking mechanism, since the locking cam member is urged against the stopper by the spring, the locking cam member is slightly opposed to the urging force of the spring member due to the collision of the steel material. Rotation and loosening of the gripping of the movable holding member was the cause of the steel material dropping.

SUMMARY OF THE INVENTION The present invention has been made to solve such a defect. When a locking cam member which is urged against a stopper by a spring member is fixed, and a steel material gripped by the locking cam member collides, the present invention has been made. It is another object of the present invention to provide a clamp in which the holding of the movable holding member is not loosened.

[0005]

SUMMARY OF THE INVENTION In order to achieve the above object, the present invention provides a body having a pair of side plates, a fixed holding portion fixed to one of the side plates, and engaging with a guide portion of the body. Lifting rod, a connecting rod connected to the lifting rod, one end of which is pivotally connected to the connecting rod, and the other end of which is rotatable about a support shaft so as to form a movable holding portion. A holding mechanism including a supported cam-shaped holding member, a locking cam member fixed to a rotating shaft supported by a main body, and a rotation of the locking cam member for maintaining the holding mechanism in a holding state. A locking mechanism comprising a stopper for stopping the movement at the locking position, a spring member for urging the locking cam member against the stopper, and a rotating shaft of the locking cam member of the locking mechanism. And a release mechanism comprising a release lever fixed thereto. In order to prevent rotation of the release lever, a safety lever which is rotatably supported by the main body and is urged to abut against the release lever by a spring member having one end attached to the main body is provided. It is.

[0006] The safety lever can be provided with operating means, and in particular, it is preferable to provide a rope as the operating means. Preferably, the safety lever is provided with a length adjusting means. Furthermore, in order to close the opening of the holding portion, it is preferable to apply the present invention to a clamp having a closing arm that is interlocked with the release lever. Furthermore, it is preferable that the safety lever is rotatably supported on the support shaft of the main body.

[0007]

According to the present invention, in order to prevent the release lever from rotating in the release direction while being rotatably supported by the main body, the spring member having one end attached to the main body is brought into contact with the release lever. Since the biased safety lever is provided, the release lever fixed to the rotating shaft of the locking cam member is fixed, and the slight rotation of the locking cam member in the releasing direction is also prevented. Therefore, the holding of the movable holding member does not loosen, and the falling off of the steel material can be prevented.
The safety lever is easy to operate if it is provided with operating means such as a rope or an operating member, and if it is provided with a length adjusting means, the release lever can be brought into contact with the most appropriate position. Can be. In particular, since the safety lever is biased by the spring, it immediately returns to the original position after the operation, and can cope with the next operation. Further, when this safety lever is supported by the support shaft of the main body, the number of parts can be reduced and the structure can be simplified.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to a clamp shown in the drawings. In the drawings, the same or corresponding portions are denoted by the same reference characters.

1 and 2, a clamp 1 includes a pair of side plates 3a and 3b, a front plate 4 and a spacer plate S disposed between the side plates 3a and 3b, and a fixed and fixed member fixed to one side plate 3a. And a main body 2 including a part 5.
The fixed holding portion 5 is made of a semi-cylindrical steel material so as to be suitable for handling a columnar steel material, and one side edge 5a has a side plate 3a.
Welded to. A suitable reinforcing member (not shown) is attached to the outer periphery of the fixed holding portion 5, and an appropriate fixed holding member 6 is mounted inside so as to be adjustable in position so as to correspond to the thickness of the steel material to be handled. . In the illustrated example, a screw 7 is provided as a means for adjusting the position.

As shown in FIG. 3, a clamping mechanism 8 of the clamp 1 has a ring 9a for engaging with a hook of a crane.
A connecting rod 11 rotatably supported by a connecting pin 10 provided at a lower end of the lifting rod 9;
The pivot pin 1 provided at the lower end 11a of the connecting rod 11
2 has one end 13a pivotally connected thereto, and the other end 13b constitutes a movable holding portion 14, and includes a cam-shaped holding member 13 rotatably supported by a support shaft 15 provided on a side plate of the main body 2. I have. A guide portion 16 is formed on each of the side plates 3a and 3b.
6 is guided so as to be movable by engaging it. Further, a window hole 4a is formed in the front plate 4 of the main body 2, and the cam-shaped holding member 13 is activated by projecting the movable holding portion 14 from the window hole 4a. As shown in the figure, the movable holding portion 14 is formed in a saw-tooth shape.

The locking mechanism 17 of the clamp 1 has a locking cam member 20 fixed to a rotating shaft 19 rotatably supported by the main body 2, and the locking cam member 20 provided on the side plate 3a. A spring member 22 that urges against a stopper 21
It consists of When the locking cam member 20 comes into contact with the stopper 21, the spring member 22 urges the locking cam member 20 in the abutting direction, and in a direction opposite to the abutting direction until reaching the abutment. The lock cam member 20 is attached at a position where the lock cam member 20 is biased. That is, in FIG. 3, the center of the rotating shaft 19 is located on the left side of a line L connecting the spring mounting portion 18 of the connecting rod 11 and the spring mounting portion 23 of the locking cam member 20, and the locking cam member 20 is The spring member 2 is brought into contact with the stopper 21.
2 and is in a so-called locked state. On the other hand, in FIG. 7, the rotating shaft 19 is located on the right side above the mounting portions 18 and 23, and the clamp is in the released state. In other words, if the center of the rotation shaft 19 is located on the line L connecting the mounting portions 18 and 23 of the spring member 22 as the dead center of the spring member 22, the locking cam member 20 contacts the stopper 21. When the locking cam member 20 is in contact with and locked, the locking cam member 20 has the spring member 22 rotated beyond the dead center.

The release mechanism 24 of the clamp 1 is
7 is a release lever 25 which is fixed to the rotation shaft 19 of the lock cam member 20 and rotates simultaneously with the lock cam member 20, and an operating means having one end pivotally connected to one end of the release lever 25. , An operation lever 26 and a rope 27 attached to the other end of the operation lever 26, and a guide 28 for the rope 27 is attached to an appropriate position of the main body 2 as necessary. The operating means includes a long release lever 25.
In this case, the operation rope 27 can be directly attached to the release lever 25 without providing the operation lever 26. The operation lever 26 is provided with a stopper pin 26a that engages with the edge of the release lever 25. When the lock cam member 20 is turned to the lock position via the release lever 25, the operation lever 26 shown in FIG. From the state shown in FIG.
The operation is performed as 6 'up to the state shown by the dotted line in FIG. 7, and after confirming that the locked state has been reached, the state is returned to the state shown by the solid line in FIG. Therefore, even if the length of the release lever 25 is short, the locking operation can be manually performed with a small force.

The clamp 1 further includes a closing arm 29.
Is provided. The closing arm 29 is rotatably supported by a stud 30 fixed to the outside of the side plate 3 b, and the release lever 2 fixed to the rotation shaft 19 of the locking cam member 20.
6 includes a guide portion 33 having a long hole 32 engaged with a pin 31 protruding from the other end, and a closing portion 34.

A safety lever 35 is rotatably attached to the clamp 1 on the support shaft 15 below the release lever 25. At the end of the long arm portion 36, a contact surface 36a is formed to abut against the lower end portion of the release lever 25 to prevent rotation in the release direction, and a rope 37 as an operating means is attached. ing. The short arm 38 of the safety lever 35 has a mounting portion 40 of a spring member 39.
Is provided, and a spring member 39 made of a tension spring is stretched between the spring mounting portion 41 fixed to the side plate 3 a of the main body 2. Therefore, the safety lever 35 is urged by the spring member 39 so that the contact surface 36a always contacts the lower end of the release lever 25. Meanwhile, the side plate 3
A guide portion 42 for restricting the movement range of the safety lever 32 is formed in b, and the movement range of the safety lever 35 is restricted by engaging with the guide portion 42.

The guide portion 42 is a bar-shaped member having both legs fixed to the side wall by welding, and guides the long arm portion 36 of the safety lever 35. When the long arm 36 is moved to the lower end of the guide portion 42 in a state where the contact surface 36a is in contact with the lower end of the release lever 25, the contact surface 36
a comes off the lower end of the release lever 25, and the release lever 2
5 is designed so as not to disturb the rotation.

The long arm 36 of the safety lever 35 is shown in FIGS.
As shown in (2), the main body 43 and the abutting member 44 having the abutting surface 36a may be constituted, and both may be integrally fixed by bolts 45. In this case, if the bolt hole of the contact member 44 is formed as a long hole, the length of the long arm portion 36 of the safety lever 35 can be adjusted, and the contact surface 35a can be reliably brought into contact with the release lever 25. Can be done. As described above, the rope 37 as the operating means is connected to the tip of the contact member 44.

Now, in the clamp 1 in the state of FIG. 8, the long steel material W is held by the fixed holding portion 5 constituting the holding portion, and the operation lever 26 is moved to the position 26 'shown by the dotted line in FIG.
To lock the locking mechanism 17 and bring the closing portion 34 of the closing arm 29 to its closed position. When the hook of the crane is hooked on the lifting ring 9a of the lifting rod 9 and the clamp 1 is pulled up, the lifting rod 9 is guided upward by the guide portion 16 of the main body and is moved upward by the cam 11 via the connecting rod 11. By urging the member 13 in the clockwise direction, the long steel material can be reliably held between the fixed holding portion 5 and the movable holding portion 14. At the same time, when the spring member 22 acts beyond its dead center in accordance with the further rising tendency of the connecting rod 11, the locking cam member 20 comes into contact with the stopper 21 and the movable holding portion 14
Can be locked (see FIG. 7). In this state, the long steel material is transported to a required place by a crane.

When the long steel material W is carried to a required place and is removed from the hook of the crane, first, the operation rope 2 is used.
By pulling 7 and 37 simultaneously, the safety lever 3
5 is removed from the lower end of the release lever 25,
Next, the release lever 25 (which is fixed to the rotating shaft 19 of the locking cam member 20) is pulled against the tensile force of the spring member 22 to exceed its dead point. In this state, the clamp 1 can be removed from the long steel material W without a gripping force acting on the movable holding portion (see FIG. 8). The safety lever 35 stops contacting the release lever 22 due to the action of the spring member 39 and, for example, simultaneously releases the release lever 2.
5 can return to its original state when its spring member 22 exceeds the dead point of action.

Then, as shown in FIG. 8 again, when the lifting rod 9 is at the lower position, the clamp 1 can be applied to a new long steel material and can be clamped as described above. .

[0020]

According to the present invention, in order to prevent the release lever from rotating in the release direction, the lower end of the release lever is supported by a spring member having one end attached to the main body. The safety lever is urged to abut against the steel material, so the release lever does not loosen even in the event of a collision of the gripped steel material, preventing the steel material from falling off. The operation can be performed quickly because the operation always returns to the original state.

[Brief description of the drawings]

FIG. 1 is a perspective view of a clamp showing an embodiment of the present invention.

FIG. 2 is a plan view of a clamp according to an embodiment of the present invention.

FIG. 3 is a side view of a main part showing an operation of the clamp according to the embodiment of the present invention.

FIG. 4 is a front view showing another safety lever of the clamp according to the embodiment of the present invention.

FIG. 5 is a side view of the safety lever of FIG. 4;

FIG. 6 is a front view showing a part of the safety lever of FIG. 4;

FIG. 7 is a front view showing a state in which the clamp according to the embodiment of the present invention grips a steel material.

FIG. 8 is a front view showing a state in which a steel material has been removed from the clamp of FIG. 7;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Clamp 2 Main body 3a, 3b Side plate 4 Front plate 5 Fixed holding part 8 Holding mechanism 9 Lifting rod 10 Connecting pin 11 Connecting rod 12 Axis pin 13 Cam-shaped holding member 14 Movable holding part 15 Support shaft 16 Guide part 17 Locking mechanism Reference Signs List 19 rotation shaft 20 locking cam member 21 stopper 22 spring member 23 release lever 24 release mechanism 25 release lever 26 operation lever 27, 37 rope 28 guide 29 closing arm 30 stud 35 safety lever 36a contact surface 39 spring member 40, 41 Spring mounting part 42 Guide part W Long steel material

Claims (6)

[Claims] 1. A main body having a pair of side plates, a fixed holding portion fixed to one of the side plates, a lifting rod movable by engaging with a guide portion of the main body, and connected to the lifting rod. And a cam-shaped holding member rotatably supported on a support shaft such that one end thereof is pivotally connected to the connecting rod and the other end forms a movable holding portion. A locking cam member fixed to a rotation shaft supported by the main body, a stopper for stopping the rotation of the locking cam member at a locking position,
A locking mechanism comprising a spring member for urging the locking cam member against the stopper, and a releasing mechanism comprising a releasing lever fixed to a rotating shaft of the locking cam member of the locking mechanism. A safety lever rotatably supported by the body to prevent rotation of the release lever, and urged to abut against the release lever by a spring member having one end attached to the body. The clamp provided with. 2. The clamp according to claim 1, wherein said safety lever is provided with operating means. 3. The clamp according to claim 2, wherein said operating means is a rope. 4. The clamp according to claim 1, wherein said safety lever is provided with a length adjusting means. 5. The clamp according to claim 1, wherein the clamp has a closing arm that works with the release lever to close an opening of the holding portion. 6. The clamp according to claim 1, wherein the safety lever is rotatably supported on a support shaft of the cam-shaped holding member.