JPH07206368A - Suspension tool - Google Patents

Abstract

PURPOSE:To provide a suspension tool which is constituted to reduce width in a lateral direction and reliably nip a thin and heavy work. CONSTITUTION:Arms 3 and 4 extending in directions opposite to each other are rotatably supported to the lower end of a suspension member 2 suspended from a hook F. The base end of a clamp arm 5 on the tip of which a nipping plate 17 is mounted is rotatably supported to the tip of the arm 3. The base end of a clamp arm 6 on the tip of which a position regulating part 7 is mounted is rotatably supported to the tip of the arm 4. The clamp arms 5 and 6 are rotatably intercoupled. A four-node rotation chain consists of the arms 3 and 4 and the clamp arms 5 and 6. A fixed block 22 is movably fixed to the clamp arm 6 and a nipping block 8 movable along a guide rail 21 is fixed to the tip of a screw shaft 23 joined in a screwed-in state with the fixed block 22.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a hoisting tool used for holding a work and suspending it on a chain block or the like when moving a heavy work.

[0002]

2. Description of the Related Art Conventionally, when a work is moved, a hanging tool 41 as shown in FIG. 5 is used to hold the work and hang it on a chain block. This hanging tool 4
1 is a shaft 43 with a pair of clamp arms 42 crossing each other.
Are rotatably connected by. Each clamp arm 4
Clamping portions 44 and 45 for clamping the work at the tip of 2
Is provided. The holding portion 44 is fixed, and the holding portion 45
Are movably connected by changing the plurality of holes 45a. A chain 46 is attached to the base end of each clamp arm 42 to connect them.

When lifting the work W, the chain 46
Hook the chain block on the hook F of the chain block 4
The work W is sandwiched between 4 and 45 and is lifted upward. Then, due to the weight of each clamp arm 42, a force is applied to the base ends of the clamp arms 42 in the direction of approaching each other, so that each clamp arm 42 rotates about the shaft 43 as a fulcrum such that the sandwiching portions 44, 45 approach each other. As a result, the sandwiching portions 44 and 45 contact the work W from both sides thereof.

When the chain 46 is pulled up further from this state, the lifting tool 41 lifts the work W while the holding parts 44 and 45 hold the work W from both sides without slipping.

By the way, a plurality of holes 42a for inserting the shafts 43 are formed in the central portion of each clamp arm 42 in the longitudinal direction.
Are formed. By appropriately selecting the hole 42a into which the shaft 43 is inserted, it is possible to change the distance between the holding portions 44 and 45 and hold the work W having greatly different thicknesses. That is, when the shaft 43 is inserted into the hole 42a below each clamp arm 42, the holding portion 4
The interval between the four and 45 becomes narrower, and the proximal end side of the clamp arm 42 becomes longer. In this state, the work W having a small thickness can be held, and the force of holding the work W can be increased by the action of the lever. On the contrary, when the shaft 43 is inserted into the upper hole 42a, the distance between the holding portions 44 and 45 becomes wider, and the base end side of the clamp arm 42 becomes shorter. In this state, the thick work W can be clamped, but the force for clamping the work W becomes weak.

[0006]

By the way, in the above-mentioned hanging tool 41, since the work W to be lifted can be lifted by sandwiching it from a relatively thin work piece to a thick work piece, each clamp can be lifted. The length of the arm 42 was long. Therefore, when a relatively thin and heavy work W is to be clamped, the holes 42a on the tip side of both clamp arms 42 are connected by a shaft 43 to narrow the gap between the clamping portions 44 and 45, and at the same time, to clamp both clamp arms 42. The length on the base end side is increased to increase the force applied to the work W for use. However, as a result, the distance between both base ends of both clamp arms 42 becomes wide, which is difficult to handle, and when used in a narrow space, the base end side of each clamp arm 42 is likely to hit surrounding objects, which is dangerous. It was

However, if the fishing tackle 41 having a short length of the clamp arm 42 is used to reduce the distance between the base ends, the lever action becomes insufficient, so that the work W can be clamped with a sufficient force. could not.

Further, when the suspending tool 41 is lifted, the clamp arm 42 tends to rotate in the direction in which the interval between the sandwiching portions 44 and 45 becomes narrow due to its own weight. Therefore, in the state in which the suspended work W is placed, the holding portions 44, 4
Each of 5 remains in contact with the work W. If the chain hoist is lifted to move the hook F in this state, there is a problem that the lifting tool 41 may clamp the work W again and lift it.

The present invention has been made in order to solve the above problems. A first object of the present invention is to make it possible to reduce the width in the lateral direction and to reliably hold a thin and heavy work piece. It is to provide a sling that can.

A second object of the present invention is to provide a suspending tool in which the sandwiched portion easily separates from the work when the lifted work is placed.

[0011]

In order to solve the above-mentioned first problem, the invention according to claim 1 relates to a suspension member suspended from a hook of a lifting device and a work suspended from the suspension member. And a holding mechanism for holding the holding mechanism so that the lifting mechanism can be lifted. The holding mechanism has a first arm that is rotatably supported at the lower end portion of the hanging member and that extends in the lateral direction. At a lower end portion of the rack member, a base end side thereof is rotatably supported coaxially with the first arm, and a second arm extending in a direction opposite to the first arm and a tip end portion of the first arm are provided. A first clamp arm whose base end is rotatably supported; and a second clamp arm whose base end is rotatably supported by the tip of a second arm. With the tip side of each of the 1st clamp arm and the 2nd clamp arm as an axis The first arm, the second arm, the first clamp arm, and the second clamp arm are rotatably connected to each other to form a four-bar rotation chain, and the first clamp arm and the second clamp arm are connected to each other. In each of the clamp arms, a holding portion is provided so as to face each other on the tip side of the shaft.

According to the second aspect of the invention, a guide portion extending in a direction substantially orthogonal to the length direction is provided at the tip of the one clamp arm, and the holding portion is moved by this guide portion. A position adjusting portion is provided that supports the nipping portion at a predetermined position of the guide portion while supporting the nipping portion.

According to a third aspect of the present invention, a pulling force that urges the first and second clamp arms toward the base end side of the axes so that the base end sides of both clamp arms approach each other. A coil spring is provided.

[0014]

Therefore, according to the first aspect of the invention, when the suspension member is lifted in the state where the work is arranged between the holding portions, the first arm and the second arm are on the same straight line. Is rotated so as to approach the state of being arranged in.
Then, by the rotation of the first and second arms, both the first and second clamp arms are rotated in the direction in which the respective holding portions approach each other. As a result, the sandwiching portions of both clamp arms have the first arm, the second arm, and the second arm that constitute the sandwiching mechanism.
The workpiece is brought into contact with the workpiece with a large force due to the boosting action of the four-bar rotation chain constituted by the first clamp arm and the second clamp arm.

Further, according to the second aspect of the invention, when the position of the holding portion is changed corresponding to the workpiece to be lifted, the holding portion is moved along the guide portion and fixed at a predetermined position.

Further, according to the invention described in claim 3, when the first and second arms are not aligned, the first and second clamp arms are rotated by the spring force of the tension coil spring, The space between the holding parts is widened.

[0017]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT An embodiment embodying the present invention will now be described with reference to FIGS.
It will be described with reference to FIG. As shown in FIG. 1, a suspension 1 is a suspension member 2 suspended from a hook F such as a chain hoist.
And a clamping mechanism C for clamping the work W. The first which is supported by the lower end of the suspension member 2 and extends in opposite directions
The arm 3 (hereinafter, simply referred to as arm 3) and the second arm 4 (also the arm 4), and the first clamp arm 5 (also the clamp arm 5) and the tip of the arm 4 supported by the tip of the arm 3. The second clamp arm 6 (also the clamp arm 6) to be supported, the holding part 7 provided at the tip of the clamp arm 5, the holding block 8 as the holding part provided at the end of the clamp arm 6, and the position adjusting part. It is composed of 9 and 9.

As shown in FIG. 2, the suspension member 2 is formed in a substantially inverted U-shape, and a connecting member 2a for connecting opposite surfaces of the suspension member 2 is fixed to an intermediate portion thereof. Plate-shaped support members 10 are fixed to both lower ends of the suspension member 2.

As shown in FIG. 4, the arm 3 has a pair of support ends 3A formed on the base end side thereof, and a pair of support ends 3B similarly formed on the tip end side thereof. The support end 3A of the arm 3 is rotatably supported by the support member 10 on a shaft 11. Contact surfaces 3a and 3b are formed between the support ends 3B. As shown in FIG. 1, the contact surfaces 3a and 3b are formed such that the upper half is formed substantially perpendicular to the length direction of the arm 3 and the lower half is inclined toward the base end side.
Further, the contact surface 3a and the contact surface 3b are connected by an arc surface.

The arm 4 has a support end 4A formed on the base end side thereof, and a pair of support ends 4B formed on the tip end side thereof. A support end 4A of the arm 4 is rotatably supported by the support member 10 on the shaft 11. Contact surfaces 4a and 4b are formed between the support ends 4B. This contact surface 4
The upper half of a and 4b is formed substantially perpendicular to the length direction of the arm, and the lower half is formed so as to be inclined toward the base end side. Further, the contact surface 4a and the contact surface 4b are connected by an arc surface.

As shown in FIG. 1, the clamp arm 5 is
The arm body 12 is formed in a substantially linear shape, and its base end portion is disposed between the support ends 3B of the arm 3, and the arm 3 has a shaft 13
It is rotatably connected with. A pair of auxiliary plates 14 are fixed to the side of the front end of the arm body 12 so as to extend substantially at right angles to the length direction of the arm body 12. Further, a holding plate 15 is fixed to the end of the arm body 12 on the side where the auxiliary plate 14 extends, substantially perpendicular to the direction in which the auxiliary plate 14 extends. A rubber pad 16 made of urethane rubber is fixed to the side of the holding plate 15 opposite to the arm body 12. In the present embodiment, the holding plate 7 and the rubber pad 16 form the holding portion 7.

An arm body 17 of the clamp arm 6 is formed in a substantially inverted T shape, and its base end portion is arranged between the support ends 4B of the arm 4 and is rotatably connected by a shaft 18. A linear portion 17a extending in the left-right direction in FIG. 1 is provided on the tip side of the arm body 17 of the clamp arm 6. Clamp arm 5 of this linear portion 17a
The side ends are arranged between the auxiliary plates 14 and are rotatably connected by a shaft 21. A plurality of holes 19 are formed on the straight line portion 17a on the opposite side of the clamp arm 5 toward the clamp arm 5 side on the same straight line. Further, as shown in FIG. 2, a guide rail 20 formed so as to project in the thickness direction of the clamp arm 6 is provided on the front end side of the linear portion 17a in parallel with the arrangement direction of the holes 19 and in the linear portion. It is formed so as to extend along 17a.

The rotation of both arms 3 and 4 is performed by rotating both arms 3 and 4.
The contact surfaces 3a, 4a or the contact surfaces 3b, 4b are regulated at positions where they contact the side surfaces of the clamp arms 5, 6. When the arms 3 and 4 are in contact with each other at the contact surfaces 3a and 4a, the arms 3 and 4 are arranged substantially at right angles to the clamp arms 5 and 6, respectively.

When both arms 3 and 4 contact the clamp arms 5 and 6 at the contact surfaces 3a and 4a, respectively, as shown in FIG. 1, both arms 3 and 4 are on substantially the same straight line. It is supposed to be arranged. That is, the arms 3 and 4 do not rotate upward beyond a state where they are arranged substantially on the same straight line. When both arms 3 and 4 contact the clamp arms 5 and 6 at the contact surfaces 3b and 4b, respectively, as shown in FIG. 3, both arms 3 and 4 are rotated downward. It is designed to be held at. In this embodiment, the arms 3, 4, the clamp arms 5, 6 and the shafts 11, 13, 18, 21 constitute a four-bar rotary chain.

The position adjusting section 9 is composed of the hole 19 and the guide rail 20, a fixed block 22 fixed to the clamp arm 6, and a screw shaft 23 screwed to the fixed block 22.

As shown in FIG. 2, the fixed block 22 has a guide groove 22a formed on the base end side thereof.
It is slidably supported by the guide rail 20 at 2a. Further, on the base end side of the fixed block 22, there are formed holes 22 b which can be opposed to the respective holes 19 of the clamp arm 6. The fixing block 22 can be fixed to a predetermined position of the guide rail 20 by making the hole 22b face any of the holes 19 and inserting the bolt 24 and fixing it with the wing nut 25. In addition, the screw hole 2 arranged in parallel with the guide rail 20 is provided on the tip side of the fixed block 22.
2c is formed.

The screw shaft 23 is the screw hole 2 of the fixed block 22.
It is screwed to 2c. A handle 26 for rotating the screw shaft 23 is attached to the base end side of the screw shaft 23. The holding block 8 has a guide groove 8a formed on the base end side thereof, and is slidably supported by the guide groove 8a on the clamp arm 5 side of the fixed block 22 of the guide rail 20. A space portion 8b is formed in the center of the sandwiching block 8, and a nut 27 is screwed to the tip small diameter portion of the screw shaft 23 protruding into the space portion 8b, so that the sandwiching block 8 is fixed to the tip of the screw shaft 23. ing.

On the clamp arm 5 side of the sandwiching block 8, a rubber pad 28 made of urethane rubber facing the rubber pad 16 is fixed. When the screw shaft 23 is rotated by the handle 26, the screw shaft 23 moves in the guide rail 20 direction with respect to the fixed block 22, and the sandwiching block 8 moves along the guide rail 20.

Holes 5a and 6a are formed on the proximal ends of the clamp arms 5 and 6, respectively, and a tension coil spring 29 is fitted between the holes 5a and 6a. Next, the operation of the suspender configured as described above will be described.

When the plate-like work W is to be hoisted by the hoisting tool 1, as shown in FIG. 3, first, the arms 3 and 4 are rotated downward. Then, the clamp arms 5 and 6 are rotated so that the base ends thereof approach each other, and the contact surfaces 3b and 4b of the arms 3 and 4 are arranged at positions where they come into contact with the clamp arms 5 and 6. As a result, the distance between the rubber pads 16 and 28 is maximized.

Then, according to the thickness of the workpiece W to be lifted, the fixing block 22 is attached to an appropriate hole 1 of the clamp arm 6.
Fix at 9. After adjusting in this way, the hook F of the chain hoist as an elevating device is hooked on the suspension member 2 to suspend the suspension 1 on the chain hoist. And
Raise and lower the chain hoist and apply rubber 1 to the hanger 1
The work W is arranged between 6 and 28. Then, the handle 26 is operated to rotate the screw shaft 23 to move and adjust the holding block 8 to adjust the distance between the rubber pads 16 and 28 to the work W.
Adjust to an appropriate size according to the thickness of.

In this state, when both clamp arms 5 and 6 are gripped and pushed down, the arms 3 and 4 are rotated about the shaft 11 in a horizontal direction. As a result,
The clamp arms 5 and 6 rotate about the shaft 21 in the direction in which the distance between the holding block 8 and the holding plate 15 becomes narrower, and the rubber pads 16 and 28 contact the work W from both sides thereof.
Next, in this state, the chain hoist is wound up, and the hanger 1 is pulled up.

From the clamp arms 5 and 6, a rubber pad 1
A force is applied to the work W via 6, 28. Therefore, when the hook F is pulled up and the clamp arms 5 and 6 rise, a frictional force is generated between the rubber pads 16 and 28 and the work W. When the suspending tool 1 is further pulled up in this state, the suspending tool 1 is hardly moved from the initial position due to this frictional force, while the arms 3 and 4 are further rotated in the horizontal direction. As a result, a force is applied to the clamp arms 5 and 6 in a direction in which the tip ends thereof are further closed. Then, a larger force is applied to the work W from the holding block 8 and the holding plate 15 by the boosting action of the four-bar rotation chain. Therefore, a larger frictional force acts between the rubber pads 16, 28 and the work W. As a result, a clamping force is finally applied to the work W to generate a frictional force enough to lift the work W from the clamp arms 5 and 6. Therefore, by pulling up the hook F, the work W is lifted while being held by the hanging tool 1.

When lowering the suspended work W again,
It looks like this: When the hook F of the chain hoist descends, the work W is placed on the floor. As a result, the force for rotating both arms 3 and 4 upward is given only by the weight of the hanging tool 1, so that the clamp arms 5 and 6 are attached to the work W.
It will not be pinched with the force that can lift it. Then, since the proximal ends of the clamp arms 5 and 6 are pulled by the tension coil spring 29 so as to approach each other, the clamp arms 5 and 6 rotate to widen the gap between the rubber pads 16 and 28. The clamp arms 5 and 6 are restricted from rotating at the positions where the contact surfaces 3b and 4b of the respective arms 3 and 4 contact the clamp arms 5 and 6, respectively. Therefore, the hanging device 1
Since the space between the rubber pads 16 and 28 is widened, the lifting tool 1 does not clamp the work W again even if the lifting tool 1 is lifted.

As described above, according to the lifting tool 1 of this embodiment, when the suspension member 2 is lifted up, the arms 3 and 4 rotate in the direction in which they are aligned, and the boosting force of the four-bar rotation chain is obtained. Due to the action, a large force acts between the holding plate 15 and the holding block 8 via the clamp arms 5 and 6, so that the work W is strongly held.

Further, even when the thin and heavy work W is clamped, the width of the hanging tool 1 does not increase. Further, by changing the hole 19 for fixing the fixed block 22,
It is possible to hold a work W having a great difference in thickness.
Further, by rotating the screw shaft 23 and moving the holding block 8, the distance between the rubber pads 16 and 28 can be optimally adjusted with respect to the thickness of the work W.

Further, since the tension coil spring 29 causes the clamp arms 5 and 6 to rotate in the direction in which the base ends approach each other,
When the arms 3 and 4 are not in contact with each other on the contact surfaces 3a and 4a, the holding block 8 and the holding plate 15 are separated from each other. Therefore, even if the hook F is lifted as it is after the work W is placed, the work W is prevented from being pinched by the hanging tool 1 again.

Further, since the contact surfaces 3a and 4a of the arms 3 and 4 are restricted by contacting the clamp arms 5 and 6, the arms 3 and 4 are rotated upward beyond the state where the arms 3 and 4 are arranged substantially in a straight line. It does not move. Therefore, when the hanging tool 1 is set on the work W, the arms 3 and 4 do not rotate upward and the setting is not troublesome. Further, while the work W is being lifted, even if a load due to acceleration or the like due to the movement of the chain hoist is applied to the hanger 1, the arms 3 and 4 do not rotate upward beyond the horizontal state, so the holding block 8
The work W is prevented from falling without expanding the space between the holding plate 15 and the holding plate 15.

Further, the contact surfaces 3b and 4b prevent the arms 3 and 4 from unnecessarily rotating too much toward the clamp arms 5 and 6, so that the contact rubbers 16 and 28 of the holding portion are substantially parallel to each other. Will be kept in proper condition.

The present invention is not limited to the above embodiments, but may be configured as follows, for example, without departing from the spirit of the invention. (1) In the above-described embodiment, the position adjusting portion 9 is provided so that the distance between the holding plate 15 and the holding block 8 can be adjusted,
The work W having a large difference in thickness can be sandwiched. This may be a dedicated suspending tool which is used only for the works W having substantially the same thickness without providing the position adjusting section 9.

(2) The clamp block 6 may be configured such that the clamp block 6 is not provided with the hole 19 and the fixed block 22 is previously fixed at a predetermined position of the clamp block 6, and the clamping block 8 is moved only by the screw shaft 23.

(3) In the above embodiment, the tension coil spring 29 is attached to the base ends of the clamp arms 5 and 6,
The clamping plate 15 and the clamping block 8 are opened without clamping the work W, but the tension coil spring 29
Alternatively, the operator may hold the clamp arms 5 and 6 and open the space between the sandwiching plate 15 and the sandwiching block 8 without providing the above.

(4) Contact surfaces 3a, 4 of each arm 3, 4
The shape of a may be such that each of the arms 3 and 4 is held slightly downward from the horizontal. In this case, the suspended work W
When the arm 3 is lowered to a predetermined position and the pulling force on the suspension member 2 is released, the arms 3 and 4 are automatically rotated to open the space between the sandwiching plate 15 and the sandwiching block 8. Further, the contact surfaces 3a, 3b, 4a, 4b do not necessarily have to be provided.

(5) Holding plate 16 for holding the rubber pads 16, 28
5. It is attached to the clamping block 8 so that the curved work W can be clamped.
Plastic, wood, metal, etc. may be fixed in order to prevent abrasion of 5 and the holding block 8. In this case, by forming unevenness on the surface, the work W
It is preferable to prevent slippage with.

In addition to the technical idea described in the claims, the technical idea grasped in the above-mentioned embodiment is as follows. (1) In both arms 3 and 4, the center of the shaft 11 is the shafts 13 and 1.
The suspending tool according to any one of claims 1 to 3, further comprising: restricting portions 3a and 4a for restricting rotation of the straight line connecting the centers of 8 toward the upper side.

According to this structure, even if a load is applied to the work W by the lifting tool 1 while holding the work W by the acceleration or the like, the arms 3 and 4 are moved upward beyond the linear arrangement. It is prevented from being rotated to. As a result,
The work W is prevented from falling.

[0047]

As described in detail above, according to the first aspect of the invention, the width in the lateral direction can be reduced and a thin and heavy work can be reliably held.

According to the second aspect of the present invention, the work can be reliably lifted by adjusting the interval of the holding portions to an appropriate size in correspondence with the work having a large difference in thickness.

According to the third aspect of the invention, the lifting of the clamped work can be easily released.

[Brief description of drawings]

FIG. 1 is a front view showing a suspender of the present invention.

FIG. 2 is a side view in which a part of the suspender is cut away.

FIG. 3 is a front view of the suspender showing a state where the sandwiching portions are open.

FIG. 4 is a plan view in which a part of a suspender is cut away.

FIG. 5 is a front view showing a conventional hanging device.

[Explanation of symbols]

2 ... Suspension member, 3 ... First arm, 4 ... Second arm,
5 ... 1st clamp arm, 6 ... 2nd clamp arm, 7 ... clamping part, 8 ... clamping block as a clamping part, 2
0 ... Guide rail as guide part, 21 ... Shaft, 22 ...
A fixed block as a holding portion, 29 ... tension coil spring, F ... hook, W ... work.

Claims (3)

[Claims] 1. A suspension member (2) suspended on a hook (F) of a lifting device and a work (W) suspended on the suspension member (2).
And a clamping mechanism (C) for clamping the clamping mechanism (C), wherein the clamping mechanism (C) is rotatably supported at the lower end portion of the suspension member (2) at its base end side and is extended in the lateral direction. Arm (3)
Similarly, at the lower end of the suspension member (2), the base end side is rotatably supported coaxially with the first arm, and the second end extended in the opposite direction to the first arm (3). An arm (3), a first clamp arm (5) whose base end is rotatably supported by the tip end of the first arm (3), and a tip end of the second arm (4). The second clamp arm (6) is rotatably supported at its base end portion, and the tip ends of the first clamp arm (5) and the second clamp arm (6) are connected to the shaft ( 21) rotatably connected to each other, and the first arm (3), the second arm (4), the first clamp arm (5) and the second clamp arm (6) are connected to each other. In addition to configuring the knot rotation chain
In each of the first clamp arm (5) and the second clamp arm (6), the holding portions (7, 8) are provided so as to face each other on the tip side of the shaft (21). Characteristic hanging equipment. 2. A guide portion (20) extending in a direction substantially orthogonal to the lengthwise direction is provided at the tip of the one clamp arm (5, 6), and the guide portion (20) sandwiches the guide portion (20). The hanger according to claim 1, further comprising a position adjusting section (9) for movably supporting the (8) and fixing the holding section (8) at a predetermined position of the guide section (20). 3. The proximal ends of both clamp arms (5, 6) are closer to the proximal ends of the first clamp arm (5) and the second clamp arm (6) than the shaft (21). The suspender according to claim 1, wherein a tension coil spring (29) for urging the suspension is provided.