Roof bolt and the like

Details Roof bolt and the like Roof bolt and the like

1978-03-27

1979-11-13

Holko, Thomas J.

85 61, F16B 1306, F16B 3102

Patent

active

041739183

ABSTRACT:
A roof bolt for use in a predrilled hole in a mine has an elongated stud on which is mounted a cylindrical sleeve. The first or inner end of the stud is threaded and carries a wedge adapted to enter one end of the sleeve and forcefully expand it in response to the rotation of the stud. The second or outer end of the stud is threaded in a like direction and carries a nut, held in a fixed position of rotation on the stud by a shear pin engaged in a common hole through part of the nut and stud. A shoulder plate is carried on the stud between the nut and sleeve, and the second end of the stud has a backing plate attached.

REFERENCES:
patent: 2159580 (1939-05-01), Zifferer
patent: 2165656 (1939-07-01), Ryan
patent: 2408559 (1946-10-01), Keating
patent: 2647431 (1953-04-01), Lewis
patent: 3188815 (1965-06-01), Schuermann et al.
patent: 3191486 (1965-06-01), Gibbens
patent: 3267792 (1966-08-01), Yackle
patent: 3315557 (1967-04-01), Dickow

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