1975-05-15
1977-05-10
Peshock, Robert
A61C 110
Patent
active
040219186
ABSTRACT:
A dental handpiece including an instrument holder which comprises an integral gear and tube, the tube having a closed-end bore or socket which houses a spiral spring of uniform inside diameter, with a slot being provided in the tube for securing one end of the spring, and with a cap which fits on the end of the tube and aids in securing the spiral spring within the tube bore, and acting to grip and hold a dental instrument within the instrument holder when the holder is stationary and driving the instrument to rotate with the instrument holder by a tightening of the coils of the spring around the instrument. A modification of the disclosure features an instrument holder comprising an integral sleeve and turbine, with the holder having means to hold the turbine and sleeve motionless so as to allow insertion and removal of a dental instrument including a ramp-type bearing sleeve. Other alternate methods of holding the sleeve motionless to allow removal include a rubber bladder with a heel, a lever pin and a locking pin.
REFERENCES:
patent: 2105330 (1938-01-01), Pagenkopf
patent: 2564893 (1951-08-01), Gibbons
patent: 2570570 (1951-10-01), Lee
patent: 3314153 (1967-04-01), Maurer
Peshock Robert
Young Dental Manufacturing Company
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