JP2003135614A - Safety clamp - Google Patents

Abstract

PROBLEM TO BE SOLVED: To eliminate such a problem that a conventional hook-shape safety hook meets an obstacle such as a wall W in the vicinity of the post P, during engagement with a post P, and cannot be engaged with the post P when a space between the post P and the wall W is narrow. SOLUTION: Four link members 1a, 1b, 2a and 2b are connected into a pantograph-shape. Then, two link members 1a and 1b are extended, and a grip section is formed. Also, a coil spring 4 and hooks 5 are provided. In this case, the coil spring 4 generates an urging force in the direction to expand a distance between two fulcrums 31 and 32. The hooks 5 are connected to each other under a state that both fulcrums 31 and 32 are neared to each other while resisting the urging force by the coil spring 4. When the hooks 5 are disengaged, the grip section is closed by the urging force of the coil spring 4.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a safety clamp for mooring a lifeline to a column or the like when working at height.

[0002]

2. Description of the Related Art For example, when performing work at height, it is necessary to prevent an operator from falling from a scaffold and getting injured. Therefore, one end of the lifeline is tied to the waist of the worker, and the other end of the lifeline is moored to a support post, etc., and when the worker loses balance or falls from the scaffolding, the body is secured by the lifeline and falls. Is being prevented.

Thus, when mooring the other end of the lifeline to the support pillar or the like, the other end of the lifeline may be directly tied to the support pillar or the like, but the work of binding and the work of untied the work are troublesome. In addition, if the connection is incomplete, the lifeline may come off from the column or the like.

In order to prevent such a problem, as shown in FIG. 5, a hook-shaped safety hook 6 is used, and the other end of the lifeline is firmly engaged with the ring portion 63 attached to the safety hook 6 in advance. The safety hook 6 is hooked on the support P to moor the lifeline to the support P.

In this conventional safety hook 6, a disengagement stopper 61 is swingably attached so that the safety hook 6 will not easily come off from the support P once the safety hook 6 is hooked on the support P. The disengagement stopper 61 is constantly urged by the torsion spring 62 in the direction in which the opening of the safety hook 6 is closed. Therefore, when the safety hook 6 is hooked on the support pillar P, the disengagement stopper 61 is pressed against the support pillar P, and the disengagement stopper 61 is swung to open the opening portion of the safety hook 6. And the support P through the opened opening
Should be inside the safety hook 6. Then, the disengagement stopper 61 closes the opening portion of the safety hook 6 again by the biasing force of the torsion spring 62, and prevents the support P from coming off the safety hook 6.

[0006]

In the conventional safety hook 6 described above, as shown in FIG. 5, when there is an obstacle such as a wall W near the support P and the distance between the support P and the wall W is narrow. Has a problem in that the safety hook 6 cannot enter the gap and the safety hook 6 cannot be hooked on the column P.

Further, since the stopper 61 must be able to swing while the safety hook 6 is hooked on the column P,
The safety hook cannot be hooked unless it is a column much thinner than the column having a thickness that can be located inside the safety hook 6.

In view of the above problems, it is an object of the present invention to provide a safety clamp capable of easily mooring a lifeline to a support even when there are obstacles near the support and the gap between the two is narrow. And

[0009]

In order to solve the above-mentioned problems, a safety clamp according to the present invention connects four link members in a pantograph form and connects two adjacent link members to each other.
The two link members are extended beyond the fulcrum that connects them to each other to form a grip portion, and the lifeline can be connected to another fulcrum opposite to the fulcrum. A biasing means for generating a biasing force in the direction of expanding the two fulcrums and a hook for connecting the two fulcrums to each other in a state in which the gripping part is expanded with the fulcrums coming close to each other against the urging force of the urging means. A member is provided, and the grip portion is closed by the urging force of the urging means by releasing the connection by the hook member.

The safety clamp is moved so that the support pillar is located inside the grip portion with the grip portion expanded by the hook member. When the connection by the hook member is released in a state where the support pillar or the like is positioned inside the grip portion, the grip portion is closed, and the grip portion sandwiches the support pillar or the like. Since the lifeline is connected to the other fulcrum described above, when the worker loses balance and pulls the lifeline, the force acts in the direction of closing the grip portion. Therefore, the safety clamp does not come off from the column or the like.

By the way, as the biasing means, a coil spring contracted between both fulcrums can be used.

[0012]

1 and 2, a safety clamp according to the present invention has four link members 1a, 1b,
2a and 2b are connected in a pantograph form. The link members 1a and 1b are connected to each other by a first fulcrum 31, and the remaining link members 2a and 2b are connected to a second fulcrum 32.
Are interconnected by. The link member 1
b and 2a are connected to each other at a third fulcrum 33, and link members 1a and 2b are connected to each other at a fourth fulcrum 34.

Both of the link members 1a and 1b extend upward in the drawing in a hook shape and constitute a grip portion. A coil spring 4 is attached between the first fulcrum 31 and the second fulcrum 32 to urge the fulcrums 31, 32 in a direction to increase the distance between them.

A hook 5 is attached to the second fulcrum 32, and the coil spring 4 is engaged with the first fulcrum 31 with the coil spring 4 contracted to reduce the distance between the fulcrums 31 and 32. The contracted state can be retained. In addition, 1 is attached to the 2nd fulcrum 32, is a board for connecting a lifeline, and the hole 11 which lets a lifeline pass is formed.

With reference to FIG. 3, the coil spring 4 is contracted from the state shown in FIG. 1, and the tip of the hook 5 is further attached to the first fulcrum 3
When engaged with 1, the gripper expands. In that state, the safety clamp is moved to a state in which the support P is located in the grip portion. Subsequently, when the tip of the hook 5 is removed from the first fulcrum 31 in this state, the urging force of the coil spring 4 widens the distance between the first fulcrum 31 and the second fulcrum 32. Then, the gripping portion is closed and the pillar P is sandwiched from both sides. Coil spring 4
Since the urging force by the force always acts in the direction of closing the grip portion, the safety clamp does not come off from the column P. Further, when the lifeline is pulled, a force acts so as to move the second fulcrum 32 away from the first fulcrum 31 via the plate 1, so that the gripping portion further firmly clamps the column P.

When the work at a high place is completed, the second fulcrum 3
The coil spring 4 may be contracted by pushing 2 toward the first fulcrum 31, and the tip of the hook 5 may be engaged with the first fulcrum 31 to hold the grip portion in an open state. In the present embodiment, the four link members 1a, 1 are used to reduce the weight.
b, 2a and 2b are formed of aluminum. Although the coil spring 4 is used as the urging means in the above embodiment, a leaf spring or any other suitable one can be selected and used.

[0017]

As is apparent from the above description, the safety clamp according to the present invention can be grasped if the tips of the two links constituting the grasping portion can go around between the support pillar and the obstacle such as the wall. Since the pillars can be gripped by the part,
There is an obstacle such as a wall in the vicinity of the support pillars, and the support pillars can be gripped by the safety clamp even if the distance between the two is narrow.

[Brief description of drawings]

FIG. 1 is a diagram showing a configuration of an embodiment of the present invention.

FIG. 2 is an exploded perspective view of a safety clamp.

FIG. 3 is a diagram showing a state in which a grip portion is expanded.

FIG. 4 is a diagram showing a state in which a supporting column is grasped by a grasping portion.

FIG. 5 is a diagram showing a configuration of a conventional safety hook.

[Explanation of symbols]

1a Link member 1b Link member 2a Link member 2b Link member 31 First fulcrum 32 Second fulcrum 4 coil spring 5 hooks

Claims (2)

[Claims] 1. The four link members are connected in a pantograph shape, and two adjacent link members are extended beyond a fulcrum connecting the two link members to each other to form a grip portion. And a biasing means for generating a biasing force in the direction of expanding between the two fulcrums and forming a lifeline so that the lifeline can be connected to another fulcrum opposite to this fulcrum. A hook member that brings the two fulcrums closer to each other against each other and connects the two fulcrums to each other in a state where the grip is expanded, and the grip is closed by the biasing force of the biasing means by releasing the connection by the hook member Safety clamp characterized by doing so. 2. The safety clamp according to claim 1, wherein the urging means is a coil spring which is contracted between both fulcrums.