Foot element and cooperable strut element for use in a roof supp

Details Foot element and cooperable strut element for use in a roof supp Foot element and cooperable strut element for use in a roof supp

1987-08-04

1988-06-07

Taylor, Dennis L.

Hydraulic and earth engineering

Earth treatment or control

Shoring, bracing, or cave-in prevention

405295, 405291, 403348, 403353, E21D 1500

Patent

active

047493119

ABSTRACT:
A foot element of an adjustable roof support mechanism includes side walls that have aligned guide grooves in their facing surfaces and a spherical bearing surface in a floor portion therebetween. The guide grooves include inclined entry portions and enlarged terminal portions. A cooperable, extendable strut element includes a tubular body having a spherical lower end and two cams extending away from opposite sides near its lower end. The cams are shaped so as to fit within the guide grooves of the foot element. When attaching the strut element to the foot element the cams thereof are moved along the entry portions of the aligned guide grooves and into the terminal portions thereof. Thereafter, the strut is rotated into a use position. When in its use position, the cams cannot be removed from the terminal portions of the guide grooves, thus preventing unintentional separation of the strut element and the foot element.

REFERENCES:
patent: 3381480 (1968-05-01), Andrews
patent: 3383868 (1968-05-01), Wilkenloh et al.
patent: 3855802 (1974-12-01), Alacchi
patent: 4056941 (1977-11-01), Watermann
patent: 4121426 (1978-10-01), Heyer
patent: 4140430 (1979-02-01), Blumenthal et al.
patent: 4309130 (1982-01-01), Bemmerl

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