Tools – Wrench – screwdriver – or driver therefor – Rigid jaws
Patent
1998-12-09
2000-07-04
Meislin, D. S.
Tools
Wrench, screwdriver, or driver therefor
Rigid jaws
81186, B25B 1308
Patent
active
060822287
ABSTRACT:
An open end wrench head is described having four principle internal engaging surfaces arranged about an imaginary central axis with the first and second internal engaging surfaces positioned on a first jaw and the third and fourth internal engaging surfaces positioned on a second opposing jaw. The first and third internal engaging surfaces are substantially flat and parallel to the imaginary central axis. The second internal engaging surface diverges outward from the first internal engaging surface and fourth internal engaging surface diverges outward from the third internal engaging surface. When the present invention wrench head is turned in one direction it acts like a standard open end wrench, however, when the present invention wrench head is turned in the other direction or in a predetermined direction, two of the four internal engaging surfaces provide a substantial increase in surface-to-surface contact with the nut, bolt or fastener being turned, thereby increasing wrench strength and torque while reducing fastener deformation and wrench wear. The benefit of having a uni-directional increase in performance is that the total free play arc of wrench to fastener is kept to a minimum, and the flip-flop feature of the wrench in limited access situations is maintained.
REFERENCES:
patent: D357618 (1995-04-01), Macor
patent: 4776244 (1988-10-01), Olson et al.
patent: 5131312 (1992-07-01), Macor
patent: 5582083 (1996-12-01), Baker
patent: 5953968 (1999-09-01), Macor
Meislin D. S.
Proprietary Technologies, Inc.
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