GB187161A - Improvements in adjustable spanners - Google Patents

Abstract

187,161. Bennett, G. M. Dec. 3, 1921. Sliding-jaw wrenches.-An adjustable spanner of the kind in which one of the jaws is adjustable on a rack mounted so as to have a limited sliding movement in a shank on the fixed jaw to set the jaws accurately to a nut after they have been set roughly by adjusting the jaw on the rack, is provided with a wedge passing transversely of the rack and engaging therewith to move it endwise. As shown, a fixed outer jaw a is integral with a shank A, and the inner adjustable jaw b is formed with a yoke b<1> which embraces the shank A and is acted on by a coiled spring j, Fig. 2, or a bent spring j<1>, Fig. 4, which normally presses teeth c<1> on the extension c of jaw b into contact with a rack d<1> mounted to have a sliding movement in the shank A. By pressing on yoke b<1>, the teeth c<1> are disengaged and the jaw moved so as to set it roughly to the required nut. The jaw b is then set accurately to the nut by means of a wedge m which adjusts the position of rack d<1> in the shank A. The rack d<1> is then guided by a pin f and slot h, and is acted on by a spring q. The wedge m is normally pressed outwards by a spring o, and is acted on by the finger to press it inwards while the spanner is set roughly. The spring o then forces the wedge m outwards, and this moves the rack d<1> to the left and reduces the distance between the jaws, thus setting them accurately to the nut.