Mine roof expansion anchor

Details Mine roof expansion anchor Mine roof expansion anchor

1975-03-06

1976-03-02

Frazier, Roy D.

85 87, F16B 1306

Patent

active

039410285

ABSTRACT:
An expansion bolt assembly of the type used in supporting mine roofs including an expansible shell having a tapered plug movable axially therein to force the outer surface of the shell into engagement with the interior of a drilled opening in the mine roof. The plug is moved by rotation in a threaded opening thereof of an axially fixed bolt, the plug being rotationally fixed with respect to the shell. The invention resides in the structure maintaining the bolt, plug and shell in assembled relationship during insertion into the drilled opening which comprises a circular metal stamping having a central opening through which the bolt is threaded and means for frictionally engaging the sides of the shell.

REFERENCES:
patent: 1455080 (1923-05-01), Croson et al.
patent: 2535879 (1950-12-01), Tinnerman
patent: 2969705 (1961-01-01), Becker
patent: 3000254 (1961-09-01), Hottenstein
patent: 3349662 (1967-10-01), Williams
patent: 3406734 (1968-10-01), Munse
patent: 3430408 (1969-03-01), Dean
patent: 3577825 (1971-05-01), Reusser
patent: 3851559 (1974-12-01), Baude
patent: 3876821 (1975-04-01), Pringle

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