Brakes – Strand – Tortuous grip
Patent
1995-08-15
1997-01-28
Young, Lee W.
Brakes
Strand
Tortuous grip
182 5, 182193, B65H 5914
Patent
active
055970524
ABSTRACT:
A descender 10 having a resistance feed arrangement 14, 15 for a rope 5, a self-acting brake (12, 14, 15, 18) to automatically apply a braking force to the rope 5 in certain circumstances such as an emergency when the user is knocked unconscious, and a variable braking mechanism 21 which allows the user to selectively vary the braking force by moving a braking surface 24 in a direction away from the rope 5 to allow a controlled reduction of the braking force, and which will automatically return to a position for maximum braking force when released. Preferably, the variable braking mechanism 21 is in the form of a cam 22 selectively pivotal by means of a handle or lever 23 which may be connected to the tail end of the rope 5 by a retention arrangement 25 to allow easy actuation of the mechanism 21. In another embodiment, the descender 10 is provided with a sheave 48 as part of the resistance feed through the descender, and which is selectively freely rotatable for larger diameter ropes 5 and which may be rotatably locked for smaller diameter ropes. In this way, the resistance of the feed of the rope 5 through the descender 10 can be adjusted to suit different diameter ropes.
REFERENCES:
patent: 1229394 (1917-06-01), Abbramson
patent: 4580658 (1986-04-01), Brda
patent: 4596314 (1986-07-01), Rogelja
patent: 5054577 (1991-10-01), Petzl et al.
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