Positive release means for articulated flexible shaft

Details Positive release means for articulated flexible shaft Positive release means for articulated flexible shaft

1978-10-04

1981-03-10

Artis, Henry K.

Boring or penetrating the earth

Below-ground impact members

With releasable means to detachably retain telescoping...

64 2R, 64 7, 64 235, 175 78, 173165, F16C 102

Patent

active

042546389

ABSTRACT:
A flexible shaft is formed of a plurality of linked sections which lock together to provide a rigid shaft when turned in a first direction as for drilling and which, when turned in the opposite direction, unlatch, thereby permitting limited relative movement of the sections so that they may follow a curved path for storage. As the sections are rotated in the first direction, certain internal notches of one section and mating external projections of the next section tend to wedge together and then do not always separate easily and readily when the torque on the shaft is reversed. A pair of cam members including ramp surfaces are incorporated into a collar through which the shaft passes such that when the shaft is driven axially in the direction to effect drilling, slots in the shaft sections passing over ramp surfaces on the key members are rotated a small amount to cause the slots and projections to latch together, and when the shaft is moved axially in the opposite direction, the slots passing the ramp surfaces are positively driven radially in a direction to break loose any wedged-together sections.

REFERENCES:
patent: 1829392 (1931-10-01), Caldwell
patent: 2926531 (1960-03-01), Sabatini
patent: 3288229 (1966-11-01), Chappuis
patent: 3493057 (1970-02-01), Peterson
patent: 4062412 (1977-12-01), McIlvanie
patent: 4141225 (1979-02-01), Varner
patent: 4172391 (1979-10-01), Dressel

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