Pit prop assembly

Details Pit prop assembly Pit prop assembly

1976-05-11

1977-06-14

Taylor, Dennis L.

E21D 1544

Patent

active

040288986

ABSTRACT:
A pit prop assembly has two pit props with parallel laterally spaced bases each having a front end turned toward a face conveyor and a rear end turned away from the face conveyor. A slide has its front end connected via positioning mechanism to the conveyor and its rear end connected via hydraulic ram to the bases. Each of the bases has at its rear end a side turned toward a confronting side on the slide and forming a side pair with this confronting side. One of these sides is formed with a formation that engages over and under another formation on the other side. One of these formations of each of the pairs of formations extends longitudinally toward the face so that the two formations can slide relative to each other. One of these formations may also be a pin whereas the other is a groove, or one may be a pair of facing convex surfaces flanking a straight edge.

REFERENCES:
patent: 3106825 (1963-10-01), Barall et al.
patent: 3811288 (1974-05-01), Wehner et al.
patent: 3837170 (1974-09-01), Martinko et al.
patent: 3896626 (1975-07-01), Spies et al.
patent: 3915500 (1975-10-01), Schlusener et al.
patent: 3925995 (1975-12-01), Harmsma et al.
patent: 3949562 (1976-04-01), Blumenthal et al.
patent: 3952525 (1976-04-01), Walker et al.

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