Hydraulic and earth engineering – Miscellaneous
Patent
1987-12-16
1989-07-25
Taylor, Dennis L.
Hydraulic and earth engineering
Miscellaneous
405288, 299 64, E21D 1500
Patent
active
048507482
ABSTRACT:
A lifting device adapted to be connected to a tractor scoop includes a plurality of first lifting members adapted to be positioned in overlying relation with a bottom wall of the scoop. One end of each first lifting member is adapted to be pivotally connected to the rear wall of the scoop, and the second free end of each first lifting member extends forward of the open front portion of the scoop. A second lifting member is pivotally connected to each first lifting member, and each second lifting member is also adapted to be pivotally connected to a horizontally movable pusher member positioned within the scoop. A support member or saddle is pivotally secured to the free end of each first lifting member, and a roof support member is supported by the plurality of saddles. The roof support member is raised into abutting contact with a mine roof above the scoop by moving the pusher member positioned in the scoop horizontally towards the open front of the scoop. As the pusher member is moved, the second lifting members pivot in an upward arcuate path, thereby pivoting the first lifting members to which they are connected in an upward arcuate path. The pusher member is moved horizontally towards the open front of the scoop until the roof support member on the support saddles is brought into abutting contact with the mine roof.
REFERENCES:
patent: 2772871 (1956-12-01), Caine
patent: 4690378 (1987-09-01), Jarman et al.
patent: 4756509 (1988-07-01), Unger et al.
Jennmar Corporation
Olsen Arlen L.
Price, Jr,. Stanley J.
Taylor Dennis L.
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