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Shifting mechanism for reversible friction drives
| Details |
Inventors: Williams, Keith S.;
Assignee:
Primary Examiner: Kisliuk; Bruce M.
Assistant Examiner: Cruz; Lawrence
Attorney, Agent or Firm: Day; Jack E.
A reversible drive mechanism for socket wrenches, having a detented selector cap thereon. The socket driving post of the wrench is fixedly attached to a triangular shaft rotatably contained within an internal cylindrical bearing surface, creating three arc-shaped spaces. The cylindrical surface is the inner surface of the head of the wrench handle. Each of the surfaces on the triangular shaft has tiltably mounted thereon a U-shaped fixture, which loosely contains within its arms a cylindrical roller. As the selector cap is rotated back and forth between selector positions, each U-shaped fixture tips back and forth on its respective triangular surface, and shifts the contained roller from one side to the other of its respective arc-shaped space. Each roller, when shifted, moves from being closely contained on one side of its arc-shaped space to being closely contained on the other side of its space and, when the wrench handle is rotated, the roller is frictionally wedged between the cylindrical surface and the shaft face, forcing the driving post and a socket mounted thereon in the desired direction. |
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DETAILED DESCRIPTION OF THE PRESENT INVENTION FIGS.
1 and 2 disclose novel shifting and detent mechanism 10 of the present invention.
Planar faces 12a-12c of triangular post 14 (FlG.
3) mount thereon U-shaped fixtures 16a-16c, respectively, with their associated additional elements.
Fixtures 16a-16c are pivotally mounted to planar faces 12a-12c by first pins 18a-18c, all respectively.
Fixtures 16a-16c have in the lower corners thereof, notches 20.
sup.
1 and 20.
sup.
2, the functions of which are described hereinafter.
There are, preferably, three of mechanism 10 in each wrench.
However, to avoid confusion and unnecessary redundancy, only one will be referred to in describing their structure and operation.
If necessary to distinguish between them, the suffix "a", "b", or "c" will be added to the identifying numerals to keep them separate.
The pivotal mounting of fixtures 16a-16c permits them to he tilted to one side (or the other) as disclosed In FIG.
2.
Triangular post 14, as disclosed in FIG.
3, is rotatingly fastened to selector cap 22, which has second pin 24 protruding therefrom Selector cap 22 also contains ball 26 resiliently mounted on spring 28 contained in cavity 30 formed in cap 22.
Ball 26 presses against the lower surface 32 of cage 16.
Cap 22, second pin 24, ball 26, spring 28, and lower surface 32 of cage 16 comprise a novel detent mechanism whose operation and function will be explained hereinafter.
Cage 16 contains roller 34, having first end 36 and second end 38 thereof, as shown.
First end 36 is oriented toward surface 40, and second end 38 rides on flat internal surface 42 of cage 16.
First and second ends 36 and 38, respectively, can be flat or, Preferably, rounded, so as to facilitate transition from one side of surface 42 to the other, Surface 44 is an inner radial planar surface of housing 46 formed at one end of wrench handle 48 to contain the shifting and detent mechanisms of the present invention, and surface 50 is an inner surface cylindrical about axis 52, which is also the axis of triangular post 14
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