Mine roof supports

Details Mine roof supports Mine roof supports

1976-05-21

1978-06-20

Taylor, Dennis L.

E21D 1544

Patent

active

040954323

ABSTRACT:
A mine roof support comprises a plurality of hydraulically extensible chock legs attached at their upper ends to one or more elongate roof bars by means of a projection on each chock leg passing through an aperture in the underside of the roof bar(s) to be located in articulated manner in any one of a plurality of positions along the roof bar(s) and within the roof bar(s) by abutment means.

REFERENCES:
patent: 353218 (1886-11-01), Harrington
patent: 3240022 (1966-03-01), Mills et al.
patent: 3312071 (1967-04-01), Dommann
patent: 3324664 (1967-06-01), Allen
patent: 3342273 (1967-09-01), Crane
patent: 3390897 (1968-07-01), Moore
patent: 3397543 (1968-08-01), Spies et al.
patent: 3408820 (1968-11-01), Bower

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