Fall arrester

Patent metadata

Field	Value
Publication number	US-12076595-B2
Application number	US-202017101210-A
Country	US
Kind code	B2
Filing date	Nov 23, 2020
Priority date	Nov 23, 2020
Publication date	Sep 3, 2024
Grant date	Sep 3, 2024

Abstract

A fall arrester includes holder, rotating drum, and braking module. The rotating drum is pivotally installed on the holder, and includes main body and pawl which has first abutting portion and is pivotally provided on setting part. The braking module is fixed to holder, and includes cover, friction plate, and ratchet plate, being coaxially set in order. The ratchet plate has second abutting portion on its periphery. When rotating drum rotates at speed greater than or equal to predetermined rotating speed, and first abutting portion moves to second position to abut against second abutting portion, the cover and ratchet plate rotate relative to friction plate, driven by rotating drum. Additionally, the cover and ratchet plate generate frictional resistance with friction plate respectively to stop the rotating drum. Thus, the braking module of the fall arrester can be replaced thereby enabling provision of a new braking module as an initial condition.

First claim

What is claimed is:

1. A fall arrester, comprising:
a holder which comprises a first arm and a second arm;
a rotating drum which is pivotally provided on the holder and located between the first arm and the second arm; the rotating drum comprises a main body and at least one pawl, wherein the main body has an accommodating part and a setting part; the accommodating part is provided to be wound by a flexible long strip; the at least one pawl has a first abutting portion and is pivotally provided on the setting part; when the rotating drum rotates at a rotating speed which is equal to or greater than a predetermined rotating speed, the first abutting portion of the at least one pawl pivots from a first position to a second position;
a braking module which has a convex portion and is fixed to the first arm by the convex portion so that the braking module is located between the first arm and the setting part; the braking module further has a plurality of second abutting portions which are located on a rotation path of the first abutting portion in the second position, wherein the rotation path is formed by the rotation of the rotating drum; the second abutting portions can abut against the first abutting portion;
wherein the braking module comprises a cover, a friction plate, and a ratchet plate, which are coaxially set in order; the ratchet plate has the plurality of second abutting portions on a periphery thereof, and further has an accommodation space for holding the friction plate and the cover, wherein the cover and the ratchet plate are fixedly connected to each other and clamp the friction plate therebetween; the friction plate has the convex portion which makes the friction plate be fixed to the first arm; when the rotating drum rotates at a rotating speed greater than or equal to the predetermined rotating speed, which makes the first abutting portion move to the second position and abut against the second abutting portions, the cover and the ratchet plate rotate relative to the friction plate, which is driven by the rotating drum, and moreover, the cover and the ratchet plate generate frictional resistance with the friction plate respectively so as to stop the rotation of the rotating drum;
wherein both the cover and the ratchet plate have a circular hole at a center thereof respectively; the friction plate has a non-circular hole at a center thereof, and a maximum inner diameter of the non-circular hole is less than or equal to a minimum inner diameters of the circular holes; the second arm comprises a shaft pole passing through the rotating drum and the braking module; the shaft pole has a non-cylindrical section which matches the non-circular hole, so that the friction plate is fixed to the shaft pole, and the cover and the ratchet plate is rotatable relative to the friction plate;
wherein the friction plate comprises a friction part and a non-circular hole part; the friction part has a first convex block on an axial direction thereof, and the non-circular hole part has a second convex block on an axial direction thereof; the first convex block and the convex portion are respectively located on two opposite sides of the friction part; the first convex block and the second convex block are connected to each other along the axial direction with dislocation.

2. The fall arrester of claim 1 , wherein a side surface of the first convex block is detachably connected to a side surface of the second convex block; when the side surface of the first convex block is connected to the side surface of the second convex block, the second convex block of the non-circular hole part abuts against and pushes the first convex block of the friction part, so that the friction part is unable to rotate relative to the non-circular hole part.

3. The fall arrester of claim 1 , wherein the ratchet plate has a first friction surface, and the friction plate has a second friction surface and a third friction surface, which are opposite to each other; the cover has a fourth friction surface; the first friction surface and the second friction surface face each other, and the third friction surface and the fourth friction surface face each other.

4. The fall arrester of claim 3 , wherein the first friction surface and the second friction surface are in contact with each other, and the third friction surface and the fourth friction surface are in contact with each other.

5. The fall arrester of claim 3 , wherein the braking module comprises at least one elastic member which is provided between the first friction surface and the second friction surface, or between the third friction surface and the fourth friction surface, or between a combination thereof.

6. The fall arrester of claim 3 , wherein the cover and the ratchet plate are fixedly connected by a plurality of fixing members; distances between the fixing members and an axis of the braking module are greater than an outer diameter of the friction plate.

7. A fall arrester, comprising:
a holder which comprises a first arm and a second arm;
a rotating drum which is pivotally provided on the holder and located between the first arm and the second arm; the rotating drum comprises a main body and at least one pawl, wherein the main body has an accommodating part and a setting part; the accommodating part is provided to be wound by a flexible long strip; the at least one pawl has a first abutting portion and is pivotally provided on the setting part; when the rotating drum rotates at a rotating speed which is equal to or greater than a predetermined rotating speed, the first abutting portion of the at least one pawl pivots from a first position to a second position;
a braking module which has a convex portion and is fixed to the first arm by the convex portion so that the braking module is located between the first arm and the setting part; the braking module further has a plurality of second abutting portions which are located on a rotation path of the first abutting portion in the second position, wherein the rotation path is formed by the rotation of the rotating drum; the second abutting portions can abut against the first abutting portion;
wherein the braking module comprises a cover, a friction plate, and a ratchet plate, which are coaxially set in order; the ratchet plate has the plurality of second abutting portions on a periphery thereof, and further has an accommodation space for holding the friction plate and the cover, wherein the cover and the ratchet plate are fixedly connected to each other and clamp the friction plate therebetween; the friction plate has the convex portion that is directly fixed to the first arm; when the rotating drum rotates at a rotating speed greater than or equal to the predetermined rotating speed, which makes the first abutting portion move to the second position and abut against the second abutting portions, the cover and the ratchet plate rotate relative to the friction plate, which is driven by the rotating drum, and moreover, the cover and the ratchet plate generate frictional resistance with the friction plate respectively so as to stop the rotation of the rotating drum.

Assignees

• Yoke Ind Corp

Inventors

• Hung Wei-Chieh
• Liao Wen-Ming

Classifications

• A62B1/10

  mechanically operated · CPC title

• A62B35/0093 Primary

  Fall arrest reel devices · CPC title