Loose roof plate retensioning device

Details Loose roof plate retensioning device Loose roof plate retensioning device

1996-11-21

1998-03-31

Taylor, Dennis L.

Hydraulic and earth engineering

Earth treatment or control

Rock or earth bolt or anchor

4052596, 411385, E21D 2102, F16B 3502

Patent

active

057330697

ABSTRACT:
The present invention relates to a loose roof plate retensioning device for the roof of a mine. The device is comprised of an externally threaded split bushing, a spacer unit and an internally threaded nut, the threading being complementary to that of the threaded bushing. When a roof plate becomes loose and drops down on the head of the roof bolt to leave a space between the roof and the roof plate, the device of the present invention allows the roof plate to be snugged against the mine roof.

REFERENCES:
patent: 1201115 (1916-10-01), Van Horne et al.
patent: 1637771 (1927-08-01), Haug
patent: 2725843 (1955-12-01), Koski
patent: 3304829 (1967-02-01), Raynovich, Jr.
patent: 4784530 (1988-11-01), Price
patent: 4975014 (1990-12-01), Rufin et al.
patent: 5259703 (1993-11-01), Gillespie
patent: 5511909 (1996-04-01), Calandra, Jr. et al.

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