Unitary roof bolt assembly

Details Unitary roof bolt assembly Unitary roof bolt assembly

1975-10-06

1977-10-04

Gilliam, Paul R.

E21D 2002

Patent

active

040516814

ABSTRACT:
A unitary roof bolt assembly which obviates the necessity for a two or more component system. The assembly includes a standard elongated roof bolt which is desired to be adhesively secured within a bore hole of a rock-like roof structure or the like. A flexible bag or sack contains a conventional quick-setting adhesive resin and hardening material and is circumflexed about the elongated stem of the roof bolt so as to surround and encompass same. Securing means are provided for maintaining the flexible sack and bolt as a unitary structure prior to insertion of the assembly into the bore hole, whereafter the flexible sack is ruptured upon rotation of the bolt and upon contact with the innermost wall of the bore hole to release the adhesive.
In a preferred embodiment, the flexible bag comprises a long thin tubular sack, having a diameter on the order of the diameter of the elongated stem of the roof bolt, and is wrapped about the stem of the bolt in a close packed spiral fashion. A reduced diameter spiral sack extends from the distal end of the bolt so as to be rupturable upon contact with the innermost wall of the bore hole.

REFERENCES:
patent: 3702060 (1972-11-01), Cumming
patent: 3913733 (1975-10-01), Flesch et al.

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