The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Sep. 02, 1980
Filed:
Sep. 20, 1978
William M Farnhill, Burnley, GB;
Platt Saco Lowell Limited, Helmshore, GB;
Abstract
An apparatus for twisting a fibre strand to have repeated along its length alternating zones of opposite twist comprises a fluid vortex device having two fluid inlets and a valve controlling fluid flow to the inlets. The valve comprises a hollow cylindrical rotatable valve member and a sleeve having a number of outlet ports surrounding the member. Fluid supplied to the hollow member is distributed to the outlet ports by rotation of the member. Plastics dry bearings between the member and the sleeve act to prevent improper flow of air along the abutting surfaces. The vortex device comprises a member formed with a bore, the bore having a wide port into which the fluid is injected through the inlets and a restricted port forming a venturi of diameter of the order twice that of the yarn. A plug through which the yarn passes at the end of the bore remote from the venturi inhibits escape of air from that end.