Mine roof bolt assembly

Details Mine roof bolt assembly Mine roof bolt assembly

1975-06-20

1977-03-15

Gilliam, Paul R.

61 45B, 85 87, F16B 3304, E21D 2100

Patent

active

040117871

ABSTRACT:
A mine roof bolt assembly including a roof bolt, one end of which has rolled threads, leaving the outer periphery of the end of the roof bolt jagged, and the central portion thereof of concave configuration. An expansion shell is mounted on the roof bolt and includes expandable leaves held together by means which permit limited radially outward movement under urging of a wedge member threadedly engaged with the roof bolt. A stop tab carried by the expansion shell limits the penetration of the roof bolt into the expansion shell. The stop tab is provided with a downwardly struck indentation which engages the concave portion of the roof bolt, the stop tab being spaced from the jagged peripheral edge of the roof bolt.

REFERENCES:
patent: 3115056 (1963-12-01), Teeple
patent: 3221590 (1965-12-01), Dickow
patent: 3248998 (1966-05-01), Siegel
patent: 3306051 (1967-02-01), Howlett
patent: 3618326 (1971-11-01), Montgomery

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