Patent GB-337071-A (GB)
Title: Tension device for wires, cables and the like
IPC: F16G11/12
Filed: 1929-07-30
Abstract: 337,071. Gotti, P. July 30, 1929. Wire strainers.-The strainer comprises a tubular member 1, Fig. 2, to which a block 6 is secured and on which a second block 8 is slidably mounted. Pivoted grippers for the wire are arranged on the blocks in such a way that as the slidable block approaches the fixed block the wire is held by the grippers of the slidable block whilst those of the fixed block are released so that the wire may pass freely therethrough in the direction of movement of the slidable block. During the return movement of the slidable block the grippers of the fixed block hold the wire, over which the grippers of the slidable block now pass freely. A spring-pressed rod 3 having a hook 2 is slidably mounted within the tube 1 and may carry a pointer which moves over a graduated scale on the tube to indicate the tension in the wire. The block 8 is moved by actuation of levers 9, 9<1>, Fig. 1, which are pivoted at 12 to an extension 12<1> of the block 8 and which are linked at 10, 10<1> to lugs 11, 11<1> of the fixed block 6. The grippers for the slidable block comprise a pair of serrated cam discs 13, Fig. 5, pivoted on pins 14 and normally pressed by springs 15 into the gripping position shown and which is limited by stops 17. Each disc is provided with a toothed segment 19 so that they move in unison. Means for adjusting the grip of the clamps may be provided and may comprise set screws 20, Fig. 7, rotatably, but not slidably, carried by the clamps and working in members 21 carrying the pivot pins 14, so that, on rotation of the set screws the clamps 13 slide backwards or forwards along the members 21. A pin projecting downwardly from each clamp engages in a slot in the corresponding toothed segment to prevent movement of the clamp otherwise than in a straight line. In this form the springs 15 by which the clamps are normally pressed into engagement with the wire abut against pins 25 which contact with stops 16. In a modification the grippers may comprise discs 26, Fig. 9, eccentrically mounted on pins 27 extending between the toothed segments 19 and upper plates 28. The discs 26 and upper plates 28 are each provided with four equidistant holes arranged at equal distances from the pin 27 and through which pins projecting from a plate 29 may be passed when the holes are in register, whereby the discs may be held in their adjusted position. In Fig. 11, the grippers for the stationary block 6 comprise serrated clamps 30 pivoted on a cross bar 32 slidable in a recess 33 in the block and normally pressed by a spring (not shown), into the gripping position shown. When the wire is being tensioned, on movement of the slidable block towards the block 6, the tension in the wire moves the cross-bar 32 against the spring and the clamps, the free ends of which slide along inclined surfaces 37, consequently open and permit the free passage of the wire. The normal position of the cross-bar 32 in the recess 33 is variable so that the grip of the clamps may be adjusted. For this purpose the bar abuts against the inner end of an externally threaded socket 35 rotatably carried by the block 6. -