Chocks

Details Chocks Chocks

1976-05-10

1977-08-30

Hafer, Robert A.

Supports

Pipe or cable

Extending through plate

A47G 2900

Patent

active

040449769

ABSTRACT:
Generally, each of my chock embodiments has one or more of the following features: a rigid body having a nonsuperficial recessed surface portion or portions on one or more of its working surfaces for saddling a rock formation; a cap portion along the top edge of each working surface of the rigid body; a runner aperture opening solely on the bottom surface of the rigid body; a separate anchor wedged in the runner aperture for securing the runner and reinforcing the rigid body; a runner anchor recessed from the top and/or bottom surfaces of the rigid body; a double loop cable runner; and in the smallest sizes, a rigid body having one or more hooked portions for setting over a constriction of a crack in a rock formation and a second portion protruding from the crack for securing a runner.

REFERENCES:
patent: 424388 (1890-03-01), Weigel
patent: 2085333 (1937-06-01), Reynolds
patent: 2827680 (1958-03-01), Gibson
patent: 3148427 (1964-09-01), Hoffstrom
patent: 3848571 (1974-11-01), Pearson et al.
patent: 3903785 (1975-09-01), Pepper
patent: 3946975 (1976-03-01), Lyman
Summit 3-1969 p. 37, "Gruvychock".

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