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US 4,108,178 AGranted
Pinch valve syringe
AssigneeProgessive Machine Products, Inc.
InventorFrank A. Betush
Life of this patent
Estimating the term…
Abstract
A syringe is provided which is particularly useful in dental work for emitting a stream of water and air under high pressure into the patient's mouth. The syringe of the invention is simplified as compared with the prior art syringes in that it uses pinch valves to perform its intended functions.
Claims9
A unit for controlling the flow of a fluid including:
- a base;
- an elongated resilient strip having a first bend therein adjacent a first end thereof and extending toward said base and having a second bend therein extending away from said base;
- an arm mounted on said base in a position displaced from the base and extending across said second bend in said strip, said second bend being normally biased by said strip towards said arm;
- a flexible tube extending between the base and the first bend in said strip to be pinched thereby and further extending between the arm and the second bend to be further pinched thereby;
- means attaching said first end of said strip to said base to establish the amount of pinching of the tube by said first bend so as to establish the rate of flow of fluid through the tube;
- and means at the other end of said strip to move the strip toward the base and away from the arm so as to release the tube from the pinching effect of said second bend and said arm.
3 more elements
Dependencies are inferred from the claim text.