Tool driving or impacting – Hammer or tool shaft reciprocated by gripping means which... – With fixed means cyclically contacted by grip structure
Patent
1992-01-27
1992-12-01
Yost, Frank T.
Tool driving or impacting
Hammer or tool shaft reciprocated by gripping means which...
With fixed means cyclically contacted by grip structure
173129, 173132, 254 29R, B25D 1700
Patent
active
051672880
ABSTRACT:
A tool comprising a temporary attachment to a rod being driven into the ground. The tool has jaws to grip the rod and has a pressure or impact receiving surface so a kelly bar may be brought to bear on the attachment. The jaws hold the rod coaxially with the kelly bar so that application of pressure does not bias the rod, possibly causing the rod to bend or to enter the ground at an unintended angle. An extension of the frame of the attachment coaxially penetrates the kelly bar to assure alignment therebetween. The jaws are spring biased to relax the grip on the bar, and are automatically repositioned on the rod upon each successive application of force by the kelly bar. An attached chain provides a lifting handle.
REFERENCES:
patent: 1724814 (1929-08-01), Wolcott
patent: 2310960 (1943-02-01), Johansen
patent: 2874934 (1959-02-01), Dannehl
patent: 3034588 (1962-05-01), Matheny, Jr. et al.
patent: 3709464 (1973-01-01), Johnson et al.
patent: 4641715 (1987-02-01), Stinson et al.
patent: 4776407 (1988-10-01), Kostylev et al.
patent: 5010710 (1991-04-01), Gray et al.
McNeil Frances B.
McNeil Robert W.
Litman Richard C.
Smith Scott A.
Yost Frank T.
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