| 摘要 |
A manually operable device for displacing movable stages includes first and second assemblies each comprising a main handle and a sub handle. A first pinion shaft is extended through both the handle assemblies and its lower end is fixedly secured to a sub handle of the first handle assembly. A second pinion shaft is rotatably provided about the first pinion shaft and its lower end is made integral with a main handle of the second handle assembly. Pinions provided at the upper ends of each shaft mesh with racks for displacing a movable stage in first and second orthogonal directions. The first and second pinion shafts have a threaded part at their lower end parts. The threaded part of the first pinion shaft is threadably engaged to a sub wheel of the first handle assembly, whereas the threaded part of the second pinion shaft is threadably engaged to a sub wheel of the second handle assembly. A spring washer is disposed between the main wheel and the sub wheel of each of the first and second handle assemblies to provide frictional engagement therebetween. Additional spring washers are positioned between each sub handle and a stationary flange to form friction couples therebetween. Adjusting of a couple is independently achieved for the first and second handle assemblies in such a manner that the sub handle is rotated by one hand while the main handle is retained with other hand of an operator.
|
