1974-01-04
1976-06-15
Peshock, Robert
A61C 110
Patent
active
039627888
ABSTRACT:
A dental handpiece has a preferably spherical housing in which a pair of ball bearings are mounted with the exterior races of the bearings against the housing and the interior races of the bearings aligned on an axis. Mounted on the two inner bearing races is a hollow spindle accessible through axial openings in the housing on the opposite ends of the spindle. The spindle has an interior taper and interior threads. Fitting into the spindle is a hollow chuck tube having an exterior taper fitting the interior taper and having exterior threads fitting the interior threads. All of the threads are of only partial depth. One end of the chuck tube has a flange abutting a bearing interior race and has a wrench-receiving portion. The other end of the spindle also has a wrench-receiving portion.
REFERENCES:
patent: 3101542 (1963-08-01), Fodor
patent: 3325899 (1967-06-01), Staunt
patent: 3499223 (1970-03-01), Lieb et al.
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