GB184521A - Platform lever mechanism for scales - Google Patents

Abstract

184,521. Marks, E. C. R., (Toledo Scale Co.). March 11, 1921. Weigh-bridges; levers; bearings. - In a weighing-scale a platform structure is supported on each of a plurality of levers by t saddle block resting on the load pivot of each lever, and by a platform support which is suspended from this block by means of a plurality of parallel rods, each of which is capable of a universal rockable movement both in respect to the block and the support. The main platform levers 8, Fig. 1, are fulcrumed on pivoted bearings at the corners of a concrete pit and are coupled to a scale beam end to a dial 29 by levers 21, 22. The adjacent ends of the levers 8 are provided with adjustable nose-irons 15 for regulating the lengths of the levers. The nose-irons are forked and are provided with inwardly-directed knife-edges 20, Fig. 10. The knife-edges rest upon swinging U-bolts 40 depending from a block 35 which rests upon the knife-edge of the lever 21 through the intervention of a pivoted bearing-block 37. The bottoms of the U-bolts 40 are connected by a plate 43. The block 35 is rigidly secured to the corresponding block at the other side of the lever 21 by means of a bolt 36 which passes through a gap in the lever. A similar connection is used between the adjacent ends of the levers 21 and the lever 22. The platform is supported on the levers 8 in the manner shown in Figs. 4 and 5, wherein a double yoke 61 straddling the lever 8 is pivoted to the platform by a pin 68 and stands on a plate 60. The presence of the pivot pin 68 allows the platform joists to flex without displacing the supports described below. The plate 60 is supported by four discs 59 having knife-edges at each side arranged at right-angles and resting on bearing-blocks 58 suspended by four rods 57. The rods 57 are supported by bearing-blocks 56, knife-edged discs 54, and saddle blocks 50, united by a rod 53 passing through a gap in the lever, the saddle blocks resting on a knife-edge 13 projecting from the lever. By this arrangement the rods 57 are permitted universal movement at both ends. In a modification two rods 57 only are used and the knife-edge 13 is arranged in a vertical gap in the lever. The height of the platform may be adjusted by screwing the rods 57 up or down relatively to the bearing-blocks 56, 58.