Tools – Wrench – screwdriver – or driver therefor – Jaw faces
Patent
1994-10-14
1995-07-04
Meislin, D. S.
Tools
Wrench, screwdriver, or driver therefor
Jaw faces
811211, 81119, B25B 1306
Patent
active
054290180
ABSTRACT:
An improved ratchet wrench is disclosed that minimizes the number of moving parts that are needed in the device to provide a low torque ratcheting action along with a non-ratcheting high torque mode of operation. Proximate each of the engaging faces of the wrench head, there is an irregular pyramidal cutout. The base of the cutout is a three sided polygon and forms a trailing engagement face when the wrench head is turned in the direction for providing torque to the nut. The apex of this cutout irregular pyramid is contiguous to, and provides a perpendicular junction between, the engaging face and the face of the wrench head. Thus, when the wrench direction is reversed, the wrench head rises up away from engagement with the nut and, upon the cooperating vertices of the nut reaching the next cutout, falls back into engagement with another set of trailing engagement edges. Ratcheting action for low torque applications is thus provided. To assist in stopping the travel of the wrench head and its various engaging faces any farther than necessary down onto the nut, a number of spring loaded balls are inserted into the engagement faces. In the preferred embodiment, there are two balls on opposite engagement faces. If higher torque is desired, these balls are capable of fully recessing into their holding slots, thus allowing the device to function as a normal wrench.
REFERENCES:
patent: 2777353 (1957-01-01), Willis
patent: 3635654 (1972-01-01), McFarland
patent: 4440047 (1984-04-01), Robbins
patent: 5255578 (1993-10-01), Liou
Meislin D. S.
Siemens Terrance L.
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