Expansion unit

Details Expansion unit Expansion unit

1974-09-05

1976-07-20

Frazier, Roy D.

85 85, F16B 1304

Patent

active

039699765

ABSTRACT:
An improved expansion unit made from heavy sheet metal for use in supporting a ceiling or roof, particularly a mine roof, comprises a wedge and a cylindrical expansion shell having a taper provided by a plurality of lateral serrations. The serrations are of gradually diminishing height designed to ensure a uniformly parallel expansion of the shell in the pre-drilled hole of the roof when the wedge is driven downwardly.

REFERENCES:
patent: 831464 (1906-09-01), O'Leary
patent: 943906 (1909-12-01), Zifferer
patent: 1513301 (1924-10-01), Wahlberg
patent: 1802270 (1931-04-01), Rawlings
patent: 2762119 (1956-09-01), Jackson
patent: 3115056 (1963-12-01), Teeple
patent: 3250170 (1966-05-01), Siegel
patent: 3577825 (1971-05-01), Reusser

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