Tools – Wrench – screwdriver – or driver therefor – Handle clutched to head
Patent
1991-08-09
1994-08-02
Smith, James G.
Tools
Wrench, screwdriver, or driver therefor
Handle clutched to head
192 44, B25B 1300
Patent
active
RE0346802
ABSTRACT:
A screw tool has a direction-reversible catch including clamping members disposed within wedge-shaped clamping spaces between an outer drive ring part (5) and an inner driven core part (8) of approximately triangular shape in cross section, the clamping members are displaceable by a rotatable switch member which is lockable in its switch positions into release with respect to the wedge walls of the corresponding clamping space by drivers acting on the clamping members and blocking the passage of the clamping members into, in each case one of their two clamping positions, and it proposes, in provide for a structurally simple friction-minimized construction wherein each clamping member lies loosely in a clamping space and is displaceable into its clamping position by the rotation of the drive ring part.
REFERENCES:
patent: 1878053 (1932-09-01), Winger
patent: 2497361 (1950-02-01), Kesterton
patent: 2584256 (1952-02-01), Brown
patent: 2685355 (1954-08-01), Stoue
patent: 2860750 (1958-11-01), Avanzati
patent: 2997148 (1961-08-01), Linsley
patent: 3908487 (1975-09-01), Plaw
patent: 4004666 (1977-01-01), Hinojosa
patent: 4051935 (1977-10-01), Nakayama
patent: 4297924 (1981-11-01), Stephens
patent: 4669339 (1987-06-01), Cartwright
Farber Martin A.
Smith James G.
Wera Werk Hermann Werner GmbH & Co.
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