Rope grab

Patent metadata

Field	Value
Publication number	US-12508449-B2
Application number	US-202418773487-A
Country	US
Kind code	B2
Filing date	Jul 15, 2024
Priority date	Apr 3, 2024
Publication date	Dec 30, 2025
Grant date	Dec 30, 2025

Abstract

A rope grab includes a housing. A rope seat portion having a rope groove and an accommodating portion are disposed on the housing. A cam member, a locking member that could return after rotation, and a linkage member are pivotally connected to the accommodating portion. The cam member clamps a rope placed in the rope groove. A limiting member is disposed in the accommodating portion and could move back and forth towards the rope seat portion. The limiting member has a limiting wheel for guiding the rope. The locking member has a first arm for restricting the limiting member from moving backward and a second arm. The linkage member has an abutting end and a safety harness attachment portion. The linkage member could selectively abut against the cam member via the abutting end or pivot to a position to move the second arm.

First claim

What is claimed is:

1 . A rope grab, comprising:
a housing having a rope seat portion and an accommodating portion, wherein the rope seat portion has a rope groove for accommodating a rope; the rope groove penetrates two opposite sides of the housing and has a wall surface; a cam member pivotally connected to the accommodating portion, wherein the cam member pivots between a first position and a second position; the cam member has a cam portion; when the cam member is located in the first position, the cam member clamps the rope together with the wall surface; a limiting member, wherein the limiting member is disposed in the accommodating portion and is movable between a third position and a fourth position; the limiting member has a limiting wheel; when the limiting member is located in the third position, the limiting wheel is nearer to the rope groove compared to when the limiting member is located in the fourth position; the limiting wheel is adapted to restrict the rope in the rope groove; a locking member pivotally connected to the accommodating portion, wherein the locking member pivots between a fifth position and a sixth position; the locking member has a first arm and a second arm; when the locking member is located in the fifth position, the first arm restricts the limiting member from moving from the third position to the fourth position; a locking member spring is connected between the locking member and the accommodating portion; the locking member spring is adapted to return the locking member to the fifth position; and a linkage member pivotally connected to the accommodating portion, wherein the linkage member pivots between a seventh position and an eighth position; the linkage member has an abutting end and a safety harness attachment portion; when the linkage member is located in the seventh position, the abutting end abuts against the cam member that restricts the cam member in the first position; when the linkage member is located in the eighth position, the linkage member moves the second arm to move the first arm from a position that restricts the limiting member to the sixth position.

2 . The rope grab as claimed in claim 1 , wherein a track is formed in the accommodating portion, and the accommodating portion has a cover plate; the cover plate has a button through hole, wherein two sides of the button through hole have a first section and a second section; a width of the second section is less than a width of the first section; the limiting member has a sliding block, wherein the sliding block is movably disposed on the track; the sliding block has a button groove; a button is accommodated in the button groove; a button spring is disposed in the button groove for abutting against the button; the button protrudes through the first section; the button has a neck portion disposed around the button, wherein the neck portion is offset from a periphery of the second section; a width of the neck portion is less than a width of the periphery of the second section.

3 . The rope grab as claimed in claim 2 , wherein two opposite ends of the sliding block respectively comprise a limiting wheel seat and a stop portion; the limiting wheel is rotatably connected to the limiting wheel seat; the first arm of the locking member faces the stop portion along an extension direction of the track, which restricts the sliding block of the limiting member from moving from the third position to the fourth position.

4 . The rope grab as claimed in claim 2 , wherein the accommodating portion has a spring seat disposed on an end of the track that is far from the rope seat portion; the sliding block has a limiting member spring groove; the limiting member spring groove has a closed end; a limiting member spring is disposed in the limiting member spring groove; two ends of the limiting member spring respectively abut against the closed end and the spring seat.

5 . The rope grab as claimed in claim 1 , wherein two opposite ends of the rope groove have an outlet and an inlet; when the limiting member moves from the fourth position to the third position, the limiting wheel protrudes toward a direction of the outlet from the accommodating portion.

6 . The rope grab as claimed in claim 5 , wherein the rope groove extends in a direction of a rope fastening axis; a first direction and a second direction, which are opposite directions, are defined along the rope fastening axis corresponding to the outlet and the inlet; the cam member has a cam member pivot portion pivotally connected to the accommodating portion; the cam portion is connected to a side of the cam member pivot portion and has a gravity center; when the cam member is located in the second position, the gravity center is located in a side of the cam portion relative to the cam member pivot portion, facing the second direction and near the rope seat portion.

7 . The rope grab as claimed in claim 6 , wherein a cam member spring is connected between the cam member and the accommodating portion; the cam member spring applies a biasing force to the cam member, so that the cam member tends to pivot towards the first position; the biasing force has less influence on a pivoting movement of the cam member compared to gravity.

8 . The rope grab as claimed in claim 5 , wherein an end of the rope seat portion that corresponds to the inlet is connected to a closure member seat; the closure member seat has two side plates which are opposite to each other; a pair of sloping holes are formed opposite each other on the two side plates; a side of each sloping hole that is close to the accommodating portion is nearer to the inlet compared to another side of each sloping hole, and the another side of each sloping hole that is far from the accommodating portion is farther from the inlet; a closure member is disposed in the closure member seat; the closure member has a guide rod, wherein two ends of the guide rod pass through the two sloping holes; when the closure member is pulled by gravity to move along the two sloping holes to a position closer to the accommodating portion, the closure member closes the inlet.

9 . The rope grab as claimed in claim 8 , wherein the housing has a base plate; two sides of the base plate are respectively connected to the rope seat portion and the accommodating portion; a rope placement opening is formed between the base plate, the rope seat portion, and the accommodating portion; a part of the base plate that is close to the rope seat portion has a rope placement notch; at least a part of the cam portion of the cam member extends to the rope placement opening; when the limiting member is located in the third position, the limiting wheel extends to the rope placement opening.

10 . The rope grab as claimed in claim 1 , wherein the cam member moves from the second position to the first position along a rotation direction; a side of the cam portion opposite to the rotation direction has an abutting surface; the abutting end of the linkage member is adapted to abut against the abutting surface, so that the cam member is limited in the first position.

Assignees

• Yoke Ind Corp

Inventors

• Hung Wei-Chieh
• Cheng Ya-Chun

Classifications

• A62B35/005

  Vertical lifelines · CPC title

• A62B35/0081

  Equipment which can travel along the length of a lifeline, e.g. travelers · CPC title

• A62B1/14 Primary

  with brakes sliding on the rope · CPC title