Rotation control device for dental handpiece

Details Rotation control device for dental handpiece Rotation control device for dental handpiece

1983-03-08

1985-01-22

Wilson, John J.

Dentistry

Apparatus

Including activator or regulator for controller or drive

91 38, 415503, A61C 102

Patent

active

044949332

ABSTRACT:
This disclosure relates to a rotation control device for an air-drive and air-journal type dental handpiece, wherein rotation control is made by applying a braking force to an air journaled turbine for a certain time by the use of compressed air operated air timer and a closing valve. When the braking force is applied to cut off drive air to the turbine, there is produced negative pressure in the bearing mechanism by the inertial rotation of the turbine, whereupon negative pressure causes the turbine to suck dirt thereinto. There is also a danger of the operator being hurt by idle rotation of the cutting tool which is rotated together with the turbine. The device of the invention prevents effectively this kind of sucking up dirt and injury to operators.

REFERENCES:
patent: 3384344 (1968-05-01), Ota
patent: 3526978 (1970-09-01), Jordan
patent: 3590582 (1971-07-01), German et al.
patent: 3666025 (1972-05-01), Hanson et al.
patent: 3732934 (1973-05-01), Brandenberg
patent: 3850078 (1974-11-01), Polizzi
patent: 3963391 (1976-06-01), Thornburn et al.
patent: 4046058 (1977-09-01), Grisebach

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