JPH071951U - Fall arrester for work in high places - Google Patents

Abstract

(57) [Abstract] [Purpose] To provide a fall arrester for work in high places, which is lighter, smaller and more durable than conventional products by providing a stopper that limits the amount of rotational protrusion of the tip of the locking claw to the outside. [Structure] A locking claw 4 is pivotally attached to a winding rotating body 3 of a winder 2 for retractably storing a lifeline 1, and a tip 4'of the locking claw 4 is provided outside the locking claw 4. The ratchet internal gear 5 provided with a locking portion 5'for locking is attached, and the winding rotary body 3 has a predetermined elasticity degree of the elastic body 6 that suppresses outward protrusion of the distal end portion 4 '. When rotating at a rotational speed or higher, the tip portion 4'rotates and projects outward due to centrifugal force, is locked by the locking portion 5 ', and is set to stop the rotation of the take-up rotating body 3, thereby causing a fall in aerial work. In the preventer, a stopper 7 for limiting the outward turning amount of the tip end portion 4 ′ of the locking claw 4 is provided in the peripheral portion of the winding turning body 3.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a fall arrester with a self-winding mechanism for working in high places.

[0002]

[Problems to be solved by conventional techniques and devices]

 In the event that a worker working in a high place accidentally steps off and crashes, a fall arrester with an automatic winding mechanism that protects the worker's life by preventing this fall is often used. .

In general, this kind of fall arrester for high-altitude work suspends this device at a desired position in the building, and winds it around the winding / rotating body 3 from the entrance / exit portion 10 of the lifeline 1 provided at the bottom of the case body 9. The lifeline 1 is pulled out, the attachment hook 11 at the tip is locked to the locking ring of the worker's belt, etc., and when the worker accidentally steps off and crashes, the lifeline 1 is suddenly pulled out. Since the take-up rotating body 3 rotates at a predetermined rotational speed or a predetermined rotational acceleration or more, the tip end 4 ′ of the locking claw 4 that rotates together with the take-up rotating body 3 overcomes the elasticity of the elastic body 6 by the centrifugal force. The locking claw pin 12 is pivotally projected outwardly, and is locked by the locking portion 5'of the ratchet internal gear 5 fixed to the inside of the case body 9 to stop the rotation of the winding rotary body 3 and the operator To prevent the fall.

However, at this time, the tip portion 4 ′ of the locking claw 4 pivotally projects into the bottom of the locking portion 5 ′ of the ratchet internal gear 5 due to the centrifugal force to stop the rotation of the winding and rotating body 3. As shown in FIG. 6, the ratchet internal gear 5 was cracked obliquely from the bottom of the engaging portion 5 ′ toward the outer circumference of the ratchet internal gear 5, and the ratchet internal gear 5 was damaged.

In order to solve the above-mentioned drawbacks, the present invention is provided with a stopper 7 for limiting the outward rotation amount of the tip end portion 4 ′ of the locking claw 4 in the peripheral portion of the winding / rotating body 3 for winding. When the moving body 3 rotates at a predetermined rotation speed or a predetermined rotational acceleration or more, the back portion of the locking claw 4 contacts the stopper 7, and the stopper 7 causes the locking claw 4 to rotate radially toward the valley bottom by the centrifugal force. The input is supported so that the ratchet inner gear 5 is provided with a locking force in the circumferential direction at the bottom of the root, and the conventional product has a ratchet inner gear 5 with a difference in inner and outer radii of about 45 ° in an oblique direction. The anti-shear length, which was the length of the ratchet internal gear 5, is increased from the contact portion of the ratchet internal gear 5 to the anti-shear length in the substantially circumferential direction of the ratchet internal gear 5 to increase the anti-shear cross-sectional area of the ratchet internal gear 5. This reduces the outer diameter and plate thickness of the ratchet internal gear 5. It also provides a lightweight, compact, and fall arrester for work in high places.

[0006]

[Means for Solving the Problems]

 The gist of the present invention will be described with reference to the accompanying drawings.

Locking claws 4 are pivotally attached to a plurality of locations around the winding rotating body 3 of the winder 2 that stores the lifeline 1 so that the lifeline 1 can be drawn out freely, and rotates together with the winding rotating body 3. A ratchet internal gear 5 provided with a plurality of locking portions 5'for locking the tip 4'of the locking claw 4 is attached to the outside of the locking claw 4, and is locked to each locking claw 4. An elastic body 6 is attached to prevent outward protrusion of the tip portion 4'of the claw 4, and the elasticity of the elastic body 6 is rotated by the winding rotary body 3 at a predetermined rotation speed or a predetermined rotation acceleration or more. When this is done, the tip end 4'of the locking claw 4 is pivotally projected outward by the centrifugal force and is locked by the locking part 5'of the ratchet internal gear 5 to stop the rotation of the winding rotary body 3. In the fall arrester for aerial work described above, a stopper 7 for limiting the outward rotation amount of the tip portion 4 ′ of the locking claw 4 is provided around the take-up rotating body 3. The present invention relates to a fall arrester for high-altitude work, which is characterized in that

[0008]

[Action]

 Since the stopper 7 for limiting the amount of outward rotation of the tip 4'of the locking claw 4 is provided in the peripheral portion of the winding / rotating body 3, the worker should fall out of his / her feet and fall into the lifeline 1. When the take-up rotating body 3 is suddenly pulled out and is rotated at a predetermined rotation speed or a predetermined rotation acceleration or more, the tip portion 4'of the locking claw 4 is rotated and projected outward by the centrifugal force, and the back part of the locking claw 4 is pulled. It abuts on the stopper 7, and the stopper 7 supports the radial rotating thrust input to the valley bottom of the ratchet internal gear 5 by the centrifugal force of the locking claw 4, so that the ratchet internal gear 5 has a substantially circumferential direction at the valley bottom. The locking force acts to stop the rotation of the winding rotary body 3 and prevent the worker from falling.

[0009]

【Example】

 The present embodiment will be described with reference to the accompanying drawings.

A take-up turning body 3 is rotatably provided in a case body 9 having two sheets. A U-shaped recess is formed on the outer peripheral surface of the winding body 3, and the lifeline 1 is wound in the U-shaped recess, and the lifeline 1 can be freely drawn out from the entrance / exit portion 10 provided below the case body 9. Provided, a mounting hook 11 is attached to the tip of the lifeline 1, a flange portion 3'is continuously provided on the right side of the winding rotary body 3, and the lifeline 1 is wound inside the flange portion 3 '. A spring spring 13 is installed inside, which constantly biases the winding spring in the direction of rotation.

Locking claw pins 12 are fixed to two opposite positions on one side surface of the take-up rotating body 3, and locking claws 4 are pivotally mounted on the locking claw pins 12, respectively. An elastic body 6 using a coil spring is attached to the elastic body 6, and the elastic body 6 is configured to prevent the tip portion 4 ′ of the locking claw 4 from normally rotating and protruding outward. Reference numeral 14 is a locking claw stopper.

Further, the ratchet internal gear 5 is fixed to the inside of the case body 9 so as to surround the respective locking claws 4, and the internal shape of the ratchet internal gear 5 is formed into a sawtooth ratchet tooth shape at predetermined intervals. To do.

A trapezoidal trapezoidal stopper 7 for limiting the outward turning amount of the tip 4 ′ of the locking claw 4 is formed in the peripheral portion of the winding rotating body 3 as one body with the winding rotating body 3. Then, the inner side wall of the truncated pyramid-shaped stopper 7 is provided perpendicularly to the take-up rotating body 3, and when the tip 4 ′ of the locking claw 4 is rotated outward, the back part of the locking claw 4 is stopped. It is provided so that it abuts on the inner side wall of the ratchet and the tip portion 4'of the engaging claw 4 abuts on the engaging portion 5'of the ratchet internal gear 5.

Since the structure of the embodiment is configured as described above, the worker steps off and crashes, the lifeline 1 is suddenly pulled out, and the winding rotating body 3 rotates at a predetermined rotation speed or a predetermined rotation acceleration or more. At this time, the tip portion 4'of the locking claw 4 which rotates together with the winding rotary body 3 pivotally projects outward with the locking claw pin 12 as an axis by centrifugal force, and the back surface of the locking claw 4 stops. The stopper 7 supports the radial projection of the locking claw 4 to the bottom of the valley by the centrifugal force of the locking claw 4, and the circular bottom of the locking portion 5'of the ratchet internal gear 5 is substantially circular. The locking force in the circumferential direction acts to stop the rotation of the winding rotary member 3 and prevent the worker from falling.

Since the present invention is provided as described above, the anti-shear length of the conventional product, which is approximately 45 ° in the diagonal direction of the length of the difference between the inner and outer radii of the ratchet internal gear 5, is set to the ratchet internal gear. The width and thickness of the ratchet internal gear 5 are designed to be small by increasing the anti-shear cross-sectional area of the ratchet internal gear 5 by increasing the anti-shear length of the ratchet internal gear 5 from the abutting portion of the ratchet 5 in a substantially circumferential direction. It is possible to provide a lightweight and compact fall arrester.

[0016]

[Effect of device]

 According to the present invention, as described above, locking claws are pivotally attached to a plurality of positions on the periphery of the winding rotary member of the winder that freely winds and stores the lifeline, and locks that rotate together with the winding rotary member. On the outside of the pawl, a ratchet internal gear having a plurality of engaging portions for engaging the tip of the engaging pawl is attached, and each of the engaging pawls extends outward from the end of the engaging pawl. An elastic body is attached to suppress the rotation protrusion, and when the elasticity of the elastic body is rotated at a predetermined rotation speed or at a predetermined rotation acceleration or more, the tip of the locking claw is moved outward by centrifugal force. In a fall arrester for work in high places, which is designed to stop the rotation of the take-up rotating body by being pivotally projected and locked by the locking portion of the ratchet internal gear, the tip of the locking claw is directed outward. Since a stopper that limits the amount of rotation is provided in the peripheral part of the take-up rotating body, a worker can step off the foot and fall, Is suddenly pulled out, and when the take-up rotating body rotates at a predetermined rotation speed or more than a predetermined rotation acceleration, the back part of the locking claw comes into contact with the stopper and the centrifugal force of the locking claw acts on the ratchet root of the ratchet internal gear. It is designed to support the radial rotation of the ratchet, and to stop the rotation of the take-up rotating body by applying the locking force in the circumferential direction to the root of the gear inside the ratchet, so that the conventional product Increase the anti-shear length, which was approximately 45 ° in the diagonal direction of the difference between the inner and outer radii of the gear, from the contact portion of the ratchet inner gear to the anti-shear length in the circumferential direction of the ratchet inner gear. Since the anti-shear cross-sectional area of the ratchet internal gear has been increased, the outer diameter and wall thickness of the ratchet internal gear can be reduced, making it a lightweight, compact, and robust fall arrester for work in high places.

[Brief description of drawings]

FIG. 1 is a rear view in which a part of the present embodiment is cut away.

FIG. 2 is a side sectional view in which a part of the present embodiment is cut away.

FIG. 3 is a partially cutaway front view showing a main part of the present embodiment.

FIG. 4 is an explanatory diagram of a main part of this embodiment.

FIG. 5 is a usage state diagram of the present embodiment.

FIG. 6 is an explanatory diagram showing a state in which the tip of the locking claw in the conventional fall arrester rushes into the ratchet root of the ratchet internal gear and a crack is generated in the ratchet internal gear.

[Explanation of symbols]

 1 Lifeline 2 Winder 3 Winding Rotating Body 4 Locking Claw 4'Tip 5'Locking 5'Ratchet Internal Gear 6 Elastic 7 Stopper

Claims (1)

[Scope of utility model registration request] 1. A locking pawl is pivotally attached to a plurality of locations on the periphery of a winding rotary body of a winder for retractably storing a lifeline, and the locking pawl rotates with the winding rotary body. A ratchet internal gear provided with a plurality of locking parts for locking the tip of the locking claw is attached to the outside, and the tip of the locking claw is projected outwardly on each locking claw. An elastic body is attached to suppress the elastic force of the elastic body, and when the winding rotary body rotates at a predetermined rotational speed or a predetermined rotational acceleration or more, the tip of the locking claw is projected outward by a centrifugal force. In a fall arrester for work in high places, which is set to stop the rotation of the take-up rotating body by being locked by the locking portion of the ratchet internal gear, the amount of outward rotation of the tip of the locking pawl is limited. A fall arrester for work in high places, characterized in that a stopper is provided in the periphery of the winding and rotating body.