Retractable core drill bit

Details Retractable core drill bit Retractable core drill bit

1983-03-24

1985-02-05

Novosad, Stephen J.

Boring or penetrating the earth

Tool removable or insertable through or around driving or...

Laterally shiftable cutter element movable through shaft

175284, E21B 1064

Patent

active

044973829

ABSTRACT:
Retractable core drill bit having a hollow cylindrical body at its lower end to which a monolith core drill bit is screwed. A stop sleeve is provided on the upper end of the hollow cylindrical body, and cutting components are pivotally mounted in the middle of the body. There is a spacer in the body having an end piece on its upper end around which there is driven a guiding sleeve resting on a stop sleeve which is surrounded by a outer end piece and an outer tube. There are longitudinal slots in the body for the radial movement of the cutting components which are disposed opposite to each other in interperpendicular planes.

REFERENCES:
patent: 2764388 (1956-09-01), Camp
patent: 2982366 (1961-05-01), Camp et al.
patent: 3661219 (1972-05-01), Okuyama et al.

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