Mechanically expanding climbing aid

Details Mechanically expanding climbing aid Mechanically expanding climbing aid

1985-09-26

1987-02-17

Foss, J. Franklin

Supports

Pipe or cable

Extending through plate

A47G 2900

Patent

active

046433775

ABSTRACT:
The present invention is an improved climbing aid which includes one or more pair of opposing cam members, two parallel axles on which the opposing cam members pivot separately with crossed radii, axle joining members situated between the opposing cam members, a looped cable member connected to the axle joining members which provides the means for attachment of a climbing rope, spring members which act to simultaneously move the cam members toward their fully expanded positions, and an operating member which is connected to each cam member such that when it is pulled the cam members retract in order to allow insertion or removal of the improved climbing aid into or out of a crack in rock.

REFERENCES:
patent: 977795 (1910-12-01), Gronke
patent: 1035419 (1912-08-01), Clark
patent: 1199297 (1916-09-01), Obeda
patent: 2682190 (1954-06-01), Snyder
patent: 3534650 (1970-10-01), Kubokawa
patent: 3877679 (1975-04-01), Lowe
patent: 3946975 (1976-03-01), Lyman, Jr.
patent: 3948485 (1976-04-01), Chouinard
patent: 4069991 (1978-01-01), Saunders
patent: 4082241 (1978-04-01), Burkey
patent: 4184657 (1980-01-01), Jardine
patent: 4422607 (1983-12-01), Vallance
patent: 4476088 (1984-10-01), Barnes
patent: 4491291 (1985-01-01), Ching

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