Raise bore drilling machine

Details Raise bore drilling machine Raise bore drilling machine

1976-03-03

1978-02-14

Purser, Ernest R.

Boring or penetrating the earth

Enlargement of existing pilot throughbore requiring...

64 236, 173165, 175195, 175320, E21C 2300

Patent

active

040733521

ABSTRACT:
A raise bore drilling rig is provided for use with a drill string of non-round cross-sectional configuration; the drill string is connectible through a pilot hole from a raise bore bit at the lower end of the pilot hole to the raise bore drilling rig at the upper end of the hole. To enable simple assembly of the drill string, the upper end of each length of drill string is circular in way of the female component of a threaded coupling. The drilling rig includes a rotary drive mechanism which mates with the non-round cross-section of individual lengths of drill string and which is rotatably driven to apply torque to the drill string as it is raised axially during the raise bore drilling process. The torque applying component of the drilling rig which is directly engageable with the drill string includes a vertically floating "bushing" which enables torque to be applied to the string as a coupling is raised through a normal "at rest" position of the bushing. While the coupling is being attached or disconnected, the drill string is temporarily held, at a location below the coupling, from falling back into the hole as the uppermost length of the string is removed from the string. The bushing is effectively expansible to enable the coupling to be passed therethrough.

REFERENCES:
patent: 1141927 (1915-06-01), Boyd et al.
patent: 1259852 (1918-03-01), Greve
patent: 2207199 (1940-07-01), Hild
patent: 2346958 (1944-04-01), Abegg
patent: 2586784 (1952-02-01), Capp et al.
patent: 2904311 (1959-09-01), Spiri
patent: 3463247 (1959-08-01), Klein
patent: 3598189 (1971-08-01), Presley et al.

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