Contra angle with interchangeable geared tools and the like
OwnerLeopold P. Lustig, Sigrid Bechterinventors
Life of this patent
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Abstract
A contra-angle housing made in two parts hinged together at one end encloses a drive shaft with drive gears at one end, and a geared hub for a dental tool or the like supported in apertures in or through the housing parts transverse to the drive shaft. A latch mechanism can be manually operated to release the two housing parts so that they can be opened to change tools, clutches or the like with integral gear hubs. When the housing parts are closed the gears on the hub automatically mesh with the drive shaft gears. Reinforced gears which can be made of molded plastic make possible low-cost interchangeable tools with integral gears.
Claims8
A spur gear on a shaft for rotating the shaft around its longitudinal axis, in which gear teeth project radially away from the shaft axis and extend a distance in the axial direction, characterized in that at one end of the gear the teeth taper radially toward the shaft and simultaneously the root thickness of each tooth tapers uniformly on both sides circumferentially toward a point, whereby the teeth at said one end are tapered subtantially conically to a point.
A rotatable tool element including a shaft and a spur gear on the shaft for rotating the shaft around its longitudinal axis, characterized by a tubular body fitted to the shaft, the body having spur gear teeth which project radially away from the shaft axis and extend along the body a distance in the axial direction, each tooth having at one end a substantially pointed part which tapers radially toward the shaft axis relative to displacement along the body in the axial direction, said part also tapering circumferentially toward a point relative to said displacement, each tooth being fixed at the other end to an annular part extending radially from the body, for providing additional support to the gear teeth.
Dependencies are inferred from the claim text.