Device for drilling borehole undercuts

Details Device for drilling borehole undercuts Device for drilling borehole undercuts

1989-03-23

1990-06-05

Novosad, Stephen J.

Boring or penetrating the earth

With above-ground guide for relatively advancing tool

175202, 175273, 408151, B28D 114, E21B 728

Patent

active

049305859

ABSTRACT:
A device for drilling an undercut (1b) in a borehole (1a) in a target material 1, includes an axially extending guide sleeve (13) containing an axially extending eccentric bore, an eccentric bushing (14) is supported rotatably in the guide sleeve and a drive shaft (15) is supported rotatably in the eccentric bushing. A housing (10, 12) laterally encloses the guide sleeve and bears against the surface of the target material. A blocking member (25) is positioned between the housing (10, 12) and the guide sleeve (13) for permitting rotation of the guide sleeve in only one rotational direction relative to the housing (10, 12). Due to the blocking member (25) entrainment of the guide sleeve (13) is prevented when the eccentric bushing is rotated in the direction opposite to the one rotational direction.

REFERENCES:
patent: 2585038 (1952-02-01), Rogacki
patent: 3000240 (1961-09-01), Eckardt
patent: 3146641 (1964-09-01), Benjamin et al.
patent: 3233480 (1966-02-01), Briney, Jr. et al.
patent: 3250155 (1966-05-01), Armstrong

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