Mine prop construction

Details Mine prop construction Mine prop construction

1978-09-28

1980-03-11

Ridgill, Jr., James L.

Supports

Props and braces

Adjustable length

52632, 138143, 29455LM, 428651, E04G 2504

Patent

active

041924797

ABSTRACT:
A hydraulically operated mine prop made of light metal, comprises an outer prop portion and at least one telescopic inner portion with at least one of these portions being provided with a non-sparking and impact-resistant metal covering. The covering may, for example, comprise steel, and an insulating layer is advantageously provided between the covering and the prop portion with which it is associated. The thickness of the covering is advantageously made from 0.2 mm to 0.6 mm.

REFERENCES:
patent: 58650 (1866-10-01), King
patent: 1467563 (1923-09-01), Armstrong
patent: 2311138 (1943-02-01), Swartz
patent: 2585128 (1952-02-01), Howe et al.
patent: 2647847 (1953-08-01), Black et al.
patent: 3031330 (1962-04-01), Hornick et al.
patent: 3086284 (1963-04-01), Schetky
patent: 3598156 (1971-08-01), Ulmer et al.
patent: 3689232 (1972-09-01), Baba et al.
patent: 3942705 (1976-03-01), Barbay

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