Power-driven screwing head

Details Power-driven screwing head Power-driven screwing head

1987-03-30

1988-06-28

Schmidt, Frederick R.

Tools

Wrench, screwdriver, or driver therefor

Responsive to movement of work

B25B 1500

Patent

active

047531428

ABSTRACT:
In order to be able to remove a screw that has been installed, in a power-driven screwing head, it is proposed according to the present invention that the recessed portion of smaller diameter be divided into two zones that extend in the longitudinal direction of the sleeve, there being a recessed portion of greater diameter between said zones.

REFERENCES:
patent: 1124981 (1915-01-01), Weaver
patent: 3403711 (1968-10-01), Moore
patent: 4237946 (1980-12-01), Leitner
patent: 4287923 (1981-09-01), Hornung

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