GB536243A - Improvements in scale lever system - Google Patents

Abstract

536,243. Weighing-apparatus. KING, B. W. Dec. 8, 1939, No. 31760. Convention date, Dec. 9, 1938. [Class 143] Compound-lever apparatus. In a scale lever system comprising a main lever 20, Fig. 8, and a sub-lever 30, Fig. 7, the main lever carries knife-edges 21, 22, 15, providing respectively a fulcrum, a support for two legs of a load carrier 40, Fig. 2, and a connection with the indicator, whilst the sub-lever has at one end fulcrum knife-edges 31 and at the other end a knife-edge 33 supporting, by means of a link 50, Fig. 2, a third leg of the load carrier 40, a push-link 35 being provided between knife-edges 23, 32 on the two levers, and the ratio of the arms of the two levers being in X Y accordance with the equation - = - these M S letters designating the distances shown in Figs. 7 and 8. The sub-lever 30 is located over the centre line of the main lever 20, and the knifeedges 31, 32, 33 are disposed in alignment substantially on the centre of the sub-lever. The knife-edges 21, 22, 31 each have parts directed in opposite directions to provide for their retention in working position by the aid of links or blocks.. Vibration, preventing and neutralizing. The pison rod 11 of a dashpot 10 is connected to a horizontal arm projecting from a draw-rod 8 coupled to the knife-edge 15.