Self-jamming safety device for a rope

Details Self-jamming safety device for a rope Self-jamming safety device for a rope

1990-05-03

1991-12-31

Graham, Matthew C.

Brakes

Strand

Tortuous grip

24134P, B65H 5924

Patent

active

050764004

ABSTRACT:
A self-jamming safety device for a rope comprises two pulleys, one of which is fixed on a base flange, and the other on a support plate capable of pivoting on an articulation spindle. The pulley is provided with a first braking surface, against which the rope is pressed by a boss of the pulley when the support plate is driven by the tension of the rope to a first jamming position. The pulley is equipped with a second braking surface operating in conjunction with the first surface following continued pivoting movement of the support plate to a second jamming position. Switching between the two jamming positions takes place after the tension of the rope has exceeded a preset threshold.

REFERENCES:
patent: 621475 (1899-03-01), McCormick
patent: 1727687 (1929-09-01), Agobian
patent: 4596314 (1986-06-01), Rogelja
patent: 4912817 (1990-04-01), Sanoreid

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