Dentistry – Apparatus – Including activator or regulator for controller or drive
Patent
1978-09-20
1980-03-25
Peshock, Robert
Dentistry
Apparatus
Including activator or regulator for controller or drive
A61C 1902
Patent
active
041942892
ABSTRACT:
A pneumatically operated system for controlling the supply of water and/or water and air simultaneously to an air turbine-type dental handpiece, either to only drive the handpiece or drive it and simultaneously provide a spray. Two foot-actuated valves respectively controlling the supply of air to a handpiece are connected to a source of air under pressure and are respectively connected to a compound servo-control valve including a spool operable in a housing between various inlet and outlet ports for air which, when one foot-actuated valve is opened, will cause the spool to move from an initially inoperative position to afford delivery of drive air only to the handpiece and when the second foot-actuated valve is opened, additional air is by-passed at the same spool setting from one part of the housing to another part containing a normally closed water valve connected to water under pressure and opened by said additional air which actuates a small piston that engages said water valve to open it. The handpiece is supported in a holder by which the spool is maintained in said inoperative position. Springs restore the spool and small piston to their initial inoperative positions.
REFERENCES:
patent: 3755899 (1973-09-01), Betush
patent: 3875958 (1975-04-01), Miller
patent: 3924660 (1975-12-01), Woodhams
patent: 4069587 (1978-01-01), Peralta
Progressive Machine Products Co., 2209 Federal Ave., Los Angeles, Calif. 90064, "Proma 360", Systems and Vertifour, 3 pp., Dec. 77.
Just C. Hercus
Peshock Robert
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