Mine prop

Details Mine prop Mine prop

1992-05-29

1994-05-24

Scherbel, David A.

Supports

With component frangible or deformable on impact or overload

248351, 2483543, 248357, E04G 2500

Patent

active

053141610

ABSTRACT:
A mine prop has a post or column formed by two telescopingly interfitted tubes, one of which has a bottleneck configuration over which the other is spread to provide a resistance to telescoping contraction. At the upper end, a nut is rotatable on the post and can advance the threaded spindle engaged therein to brace the prop between the roof and ceiling of a subterranean structure.

REFERENCES:
patent: 1006163 (1911-10-01), Winz
patent: 3027140 (1962-03-01), Holzbach
patent: 3222030 (1965-12-01), Thorpe
patent: 3737134 (1973-06-01), Foon
patent: 4185940 (1980-01-01), Spies
patent: 4301989 (1981-11-01), Kallenbach
patent: 4382721 (1983-05-01), King
Brochure published by Dywidag Systems International, Lamont, Ill., entitled "Dywidag Coal Post, The Yieldable Roof Support System".

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