Climbing assist apparatus having controlled descent and escape m

Details Climbing assist apparatus having controlled descent and escape m Climbing assist apparatus having controlled descent and escape m

1984-02-15

1985-11-05

Machado, Reinaldo P.

Fire escape, ladder, or scaffold

Torso harness

Attached to strand wound on reel, and means for retarding...

182 8, 182 10, A62B 3502, A62B 112

Patent

active

045508046

ABSTRACT:
A climbing assist apparatus for oil derricks and the like comprises a cable which is attached to the worker and is trained over a sheave at the crown portion of the rig, then connected to a counterweight in order to remove slack from the cable as the worker is climbing. The sheave is keyed to a motor drive shaft which is free wheeling in one direction of rotation in response to advancement of the cable as the workman is climbing but will impose a controlled resistance in the opposite direction, this resistance being established through a hydraulic motor for the drive shaft and a hydraulic control circuit which includes a flow controller to resist the rotation of the motor in the opposite direction to that earlier described when the worker descends or should accidentally fall from the derrick.

REFERENCES:
patent: 1571096 (1926-01-01), Rambin et al.
patent: 1849725 (1932-03-01), Quick
patent: 2538904 (1951-01-01), Herod
patent: 2670890 (1954-03-01), Hodge
patent: 2948348 (1960-08-01), Bott
patent: 3261590 (1966-07-01), Bech
patent: 3826335 (1974-07-01), Allen
patent: 4252214 (1981-02-01), Miller
patent: 4442918 (1984-04-01), Rhoads
patent: 4458781 (1984-07-01), Ellis

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