GB888576A - Improvements relating to textile testing machinery - Google Patents

Abstract

888,576. Testing tensile strength of threads. COURTAULDS Ltd. March 19, 1959 [March 20, 1958; June 6, 1958], Nos. 8915/58 and 18094/58. Class 106 (2). Apparatus for testing the tensile properties of threads comprises two clamps 1, 2, one fixed, the other movable, each clamp containing a continuous closed passage 3, these passages cooperating to form a single closed passage when the clamps are closest together, and means 21, 22 for producing a current of fluid in the passage. The clamps shown are stated to be of use in the testing apparatus described in U.S.A. Specification 2,442,150. Each clamp comprises a metal body provided with a U-shaped passage 3 around a bollard 5. Movable members 7 connected by stirrups 9 to pneumatic cylinders 11 act to clamp the thread against the bollards 5 when air is introduced into the cylinders. The clamp 1 carries a sleeve 15 and the clamp 2 has a corresponding tube 18 of smaller diameter. When the clamps 1, 2 are at their nearest positions, the sleeve 15 abuts a resilient buffer 17 provided on the clamp 2 and thus the passages 3, the sleeve 15 and the tube 18 form a continuous closed passage. Thread to be tested is fed into an inlet 19 and is drawn, by air passing through a Venturi 22 in a tube 21, through the closed passage, a measuring-device situated near the inlet 19 measuring off a suitable length. Air is then supplied to the cylinders 11 and the thread clamped as described, a test then taking place by tilting the track on which the clamp 2 is mounted, until the thread breaks. The whole test sequence is then repeated automatically. Specification 872,475 also is referred to.