Fluid handling – Systems – Plural noncommunicating flow paths
Patent
1977-04-28
1978-10-03
Nilson, Robert G.
Fluid handling
Systems
Plural noncommunicating flow paths
32 22, 251 5, 251 9, F16K 707
Patent
active
041178610
ABSTRACT:
A control and selector unit for a dental handpiece is provided of the high pressure air driven type. The control and selector unit includes a bracket for supporting a handpiece, and a resilient metal strip having a free end extending into the bracket. The other end of the resilient strip is supported on the base of the control unit, and the strip acts as a pinch valve for a tube carrying high pressure drive air to the handpiece. The pinch valve releases the tube when the handpiece is removed from the bracket so as to cause the handpiece to be activated. The control unit may also include additional resilient strip pinch valve controls for controlling the supply of coolant air, or other gases, and water to the handpiece when the handpiece is removed from the bracket. A swell tube may be included in the control unit to provide a delayed action for the latter pinch valve resilient strip controls, so that the coolant air, or other gases, and water may be supplied to the handpiece only after the handpiece has been brought up to speed by the drive air. The water control may also include a "suck-back" feature which prevents dripping when the handpiece is returned to the bracket at the end of a dental operation.
REFERENCES:
patent: 2734526 (1956-02-01), Aagaard
patent: 2895653 (1959-07-01), Giepen
patent: 3316935 (1967-05-01), Kaiser
patent: 3584830 (1971-06-01), Koehn
Beecher Keith D.
Nilson Robert G.
Progressive Machine Products, Inc.
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