Machine element or mechanism – Gearing – Plural power paths to and/or from gearing
Patent
1990-09-17
1992-06-16
Herrmann, Allan D.
Machine element or mechanism
Gearing
Plural power paths to and/or from gearing
74 1054, 74 8917, 359392, F16H 3706, F16H 3518, F16H 2920, G02B 2132
Patent
active
051216558
ABSTRACT:
A coaxial fine and coarse adjusting device for moving a movable member movably supported on a device body includes a coarse adjustment handle, a fine adjustment handle provided coaxially with respect to the coarse adjustment handle, a bearing member fixed to the device body, a rotation transmission shaft rotatingly supported in the bearing member, the rotation transmission shaft having a pinion for the movement of the movable member, a hollow cylindrical coarse adjustment shaft which passes through the rotation transmission shaft and is rotatably supported by the rotation transmission shaft and the bearing member, a rotatable fine adjustment shaft which passes through the coarse adjustment shaft, a reduction gear train provided between the rotation transmission shaft and the fine adjustment shaft, a first retaining member provided on one end of the coarse adjustment shaft for retaining the reduction gear train in such a manner that it can turn around about its own axis and rotate about the coarse adjustment shaft and for removably retaining the coarse adjustment handle, a flange member provided on the other end of the coarse adjustment shaft, a second retaining member provided on one end of the fine adjustment shaft for removably retaining the fine adjustment handle, a shaft end collar provided on the other end of the fine adjustment shaft in opposed relation to the flange member, a first frictional braking means for frictionally braking the first retaining member such that it inhibits a rotation of the first retaining member relative to the device body while the fine adjustment handle is being rotated and such that it allows for the rotation of the first retaining member relative to the device body while the coarse adjustment handle is being rotated, and a second frictional braking means for frictionally braking a rotation of the shaft end collar relative to the flange member such that it inhibits a relative rotation between the fine adjustment shaft and the coarse adjustment shaft while the coarse adjustment shaft is being rotated and such that it allows for the relative rotation while the fine adjustment handle is being rotated.
REFERENCES:
patent: 3683704 (1972-08-01), Kuroha
patent: 4083256 (1978-04-01), Shio
patent: 4445758 (1984-05-01), Emmel
patent: 4482221 (1984-11-01), Clark
patent: 4573771 (1986-03-01), Hill
patent: 4968118 (1990-11-01), Maki et al.
Herrmann Allan D.
Krolikowski Julie
Nikon Corporation
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