Pinch valve formed from a wire helix
Patent 4063706 Issued on December 20, 1977. Estimated Expiration Date: 
December 20, 1994. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.
December 20, 1994. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.Patent References 2642025 2663114 3374509 InventorApplicationNo. 05/727993 filed on 09/30/1976US Classes:251/4, TUBE COMPRESSORS24/131R, Wire29/451, Confining elastic part in socket29/890.13Including metal deformingExaminersPrimary: Schwadron, Martin P.Assistant: Gerard, Richard Attorney, Agent or FirmAbstractA wire helix having adjacent turns normally spaced so that the wall of a flexible tubing will be pinched closed when placed between them has at least one pair of turns spaced far enough apart to allow the tubing to pass between them without being pinched; valving action takes place when the tubing is twisted around the helix to move it between the unobstructed position to the pinched position. In a modified form, there are two locations in the helix where the tubing may pass outwardly and then reenter the helix without being obstructed; in this form, the looped portion of the tubing lying outside the helix may be rotated about the helix in either direction to pinch it closed. | |
