Dentistry – Apparatus – Hand manipulatable implement
Patent
1978-04-03
1980-01-29
Lazarus, Ronald H.
Dentistry
Apparatus
Hand manipulatable implement
64 3, 64 2R, 433112, F16C 106, F16C 126
Patent
active
041854748
ABSTRACT:
A device for coupling power from a high speed rotating flexible shaft to a spindle of a portable worktool. The flexible shaft is contained within a casing. The casing is crimped within a ferrule which is threaded into a handpiece which an operator holds in one hand to guide the worktool. Upon movement of the worktool on the workpiece by the operator, the casing becomes twisted to encourage loosening of the threaded connection between the ferrule and handpiece, thus endangering the operator. In lieu of the prior art threaded connection between the ferrule and handpiece, a retaining member engages both to prevent their dangerous separation by virtue of the handpiece and retaining member being free to slowly rotate about the ferrule in a direction to automatically relieve twisting stresses introduced into the casing caused by movement of the worktool by said handpiece on or about a workpiece.
REFERENCES:
patent: 2377271 (1945-05-01), Schumann
patent: 2586369 (1952-02-01), Mall
patent: 2801530 (1957-08-01), Holt
patent: 3190084 (1965-06-01), Moon
patent: 3372560 (1968-03-01), Dalton
patent: 3587248 (1971-06-01), Umanos
Lazarus Ronald H.
Pennwalt Corporation
Suga Arthur M.
Turner R. C.
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