Yieldable roof support system

Details Yieldable roof support system Yieldable roof support system

1992-04-10

1995-03-28

Chotkowski, Karen J.

Supports

Props and braces

Adjustable length

248548, 405290, E21D 1500

Patent

active

054009944

ABSTRACT:
A support includes a base member having an open end and a hollow interior, a forcing member having an end extending through the open end of the base member into the hollow interior thereof and having threads thereon and a mandrel or sliding nut capable of engaging the threads of the forcing member at an adjustable position and providing an interfering relationship between the base and forcing members as a compressive load is applied thereto. The support is particularly adapted for use in supporting the roof of a mine.

REFERENCES:
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patent: 2504291 (1950-04-01), Alderfer
patent: 2535956 (1950-12-01), Roggensack
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patent: 4080794 (1978-03-01), Neu
patent: 4249837 (1981-02-01), Spies
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patent: 4309130 (1982-01-01), Bemmerl
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patent: 4382721 (1983-05-01), King
patent: 4425057 (1984-01-01), Hahn
patent: 4534531 (1985-08-01), Brown
patent: 4565469 (1986-01-01), Chlumecky
patent: 4601616 (1986-07-01), Barish et al.
patent: 4630971 (1986-12-01), Herbst et al.
patent: 4662795 (1987-05-01), Clark et al.
patent: 4741505 (1988-05-01), Anderson
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Coal Magazine, Jun. 1990, pp. 136, 137.
Jennmar Corp. Brochure.
Coal Age, Mar. 1987, pp. 30-33.
Sketches entitled "Design of Yieldable Anchor Heads".
Brochure entitled "Yippi-Yieldable Steel Post" by Western Support Systems of Salt Lake City, Utah, 8-91.
Advertisement entitled Heintzmann Schnellspan -Stutze/Super-Prop (two pages, not dated).

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