Self-retaining roof bolt

Details Self-retaining roof bolt Self-retaining roof bolt

1977-05-05

1978-01-17

Gilliam, Paul R.

52232, 85 63, E21D 2100, E21D 2000

Patent

active

040684814

ABSTRACT:
A self-retaining roof bolt comprising an elongated U-shaped member having a pair of spaced legs which support a flat plate fitted over the U-shaped member and are held under transverse tension at ambient temperature by a grouting which becomes malleable at elevated temperatures. The roof bolt is installed in a roof hole by momentarily heating the leg sections, which causes the grouting to soften, releasing the tension on the legs and allowing them to separate and wedge against the roof hole walls. Thus, the bolt retains itself in the roof hole while the grouting cools. Upon cooling, the grouting re-solidifies, firmly securing the bolt.

REFERENCES:
patent: 3855742 (1974-12-01), Jeter
patent: 3936924 (1976-02-01), Ichise et al.

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