Mine roof supports

Details Mine roof supports Mine roof supports

Filed on

1987-06-19

Date issued

1988-11-15

Examiner

Taylor, Dennis L.

Patent Class

Hydraulic and earth engineering

SubClass

Earth treatment or control

SubSubClass

Shoring, bracing, or cave-in prevention

Other Related Categories

405291, E21D 1705

Type

Patent

Status

active

Patent number

047845325

Description

ABSTRACT:
A roof engaging structure for a mine roof support comprises at least two relatively movable roof engaging members 21 and 23, which are coupled together by at least two spaced-apart pivotal joints 25 and 26. The pivotal joints combine to influence the relationship of the roof engaging surfaces of the two members. In one embodiment for example, the roof engaging surfaces of the two roof engaging members may adopt either an angular or a parallel relationship with respect to one another, one surface lying at least partially below the adjacent surface. The arrangement enables the roof engaging structure to shape itself to various forms of mine roof, while preventing jack knifing of the forward end of the roof engaging structure.

REFERENCES:
patent: 3872678 (1975-03-01), Shuttleworth
patent: 3889475 (1975-06-01), Allen

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