Tools – Wrench – screwdriver – or driver therefor – Handle clutched to head
Patent
1974-09-25
1976-07-20
Smith, Al Lawrence
Tools
Wrench, screwdriver, or driver therefor
Handle clutched to head
81 91B, B25B 1350, B25B 1328
Patent
active
039699633
ABSTRACT:
A wrench with relatively movable members to transmit gripping force between said members comprising a swinging element with the rear face of arcuate form on which side are gear teeth, a series of connecting links the final link forming the handle, said handle having an arcuate form on the outer face of similar profile to the first swinging element on which handle arcuate face are formed gear teeth in such a manner that, when the links enclose a pipe or similar round object and force is applied to said handle, the meshing gear teeth on the opposing arcuate faces drive the swinging element into frictional engagement with the pipe, urging said pipe into frictional engagement with the inside faces of the other links, said links having teeth formed on the inside faces in such a manner as to grip said pipe and angled in such a manner that, when further force is applied to said handle, the entire assembly is rotated about the longitudinal center line of the said pipe.
REFERENCES:
patent: 857220 (1907-06-01), Zanto
patent: 1471415 (1923-10-01), Platt
patent: 1611808 (1926-12-01), Bessolo
patent: 1906696 (1933-05-01), Lynch
patent: 2557202 (1951-06-01), Raymond et al.
patent: 3097552 (1963-07-01), Kelley
patent: 3662867 (1972-05-01), Kinzbach
Smith Al Lawrence
Smith James G.
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