Retractable bit guide for a drilling and bolting slide

Details Retractable bit guide for a drilling and bolting slide Retractable bit guide for a drilling and bolting slide

1983-02-01

1984-09-18

Levy, Stuart S.

Cutlery

175220, 173141, F16C 126, E21C 900, E21D 2000

Patent

active

044720025

ABSTRACT:
The body of a bit guide assembly is mounted on a base which pivots on a frame about a first pivot point and may thus be retracted in order to allow the passage of the anchoring bolt screwed after drilling a hole. A double-acting jack has its rod pivoted on the base, whereas its body is pivoted on a dog, in turn mounted to pivot on the frame about a second pivot opposite the pivot point. The dog comprises a locking tooth which cooperates with the end of the base remote from the first pivot point. The free end of the dog cooperates with a retaining tooth formed on a connecting-rod, mounted to pivot about a fixed pin and biased by a spring against a stop. The same jack thus controls the retraction of the bit guide, for bolting and its locking in the lowered position, for drilling.

REFERENCES:
patent: 2314366 (1943-03-01), Paget
patent: 3149680 (1964-09-01), Downend
patent: 3967686 (1976-07-01), Fogelstrom
patent: 4105081 (1978-08-01), Perraud
patent: 4300642 (1981-11-01), Perraud
patent: 4402557 (1983-09-01), Paasonen et al.

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