Patent GB-1466818-A (GB)
Title: Low-profile platform scale
IPC: G01G1/24
Filed: 1975-05-30
Abstract: 1466818 Platform weighing machine MANGOOD CORP 30 May 1975 [2 Oct 1974 7 April 1975]  23678/75 Heading G1W A platform scale Figs. 1, 4, 6 comprises a base 17; a first lever 18 of unitary construction which comprises arms 72, 73, 77 and a connecting member 74 pivotally mounted in the central region of the base at a lower elevation; a second lever 19 of unitary construction which comprises arms 84, 85, 88/89 and a connecting member 85' pivotally mounted in the central region of the base at an upper elevation; a platform 16 supported from the ends of lever arms 72, 73, 84, 85; a load cell 33 mounted on the base; means connecting the lever arm 77 to the load cell; and means connecting the lever arm 88/89 to lever arm 77. The base Fig. 12 (not shown), platform, Fig. 9 (not shown) lever 18 see also Fig. 11 (not shown) and lever 19 see also Fig. 10 (not shown) are of unitary cast construction. The base has a grid construction and includes front and rear upstanding members 40, 41, Fig. 4, from which levers 18, 19 are pivoted by means of flexive strips Fig. 14 (not shown).- The platform has a grid construction, and includes at each corner, a depending leg 110, Figs. 1, 4 having a foot 118 underlying the end of one of the lever arms 72, 73, 84, 85 and connected thereto by means of a flexible cable 124. Each of the rear two cables is connected to the associated lever arm via a non- adjustable ferrule, Fig. 2a (not shown) while each of the front two cables is connected to the associated lever arm by a ferrule mounted in an eccentric mounting, Fig. 15 (not shown) whereby the horizontal position of the ferrule may be adjusted during setting up of the scale. The arm 88/89 of the second lever 19 is connected by a further flexible cable 124 to the arm 77 of the first lever 18, the connection of the cable to arm 88/89 being adjustable, Fig. 13 (not shown) to aid in setting up the scale. The outer end of arm 77 is connected to the electrical load cell 33 by a further cable. The base includes bosses 52-56 carrying adjustable feet, and a spirit level 37, Fig. 6. In a second embodiment, Figs. 16, 17, 23, which is essentially similar to the first, the base 217, Fig. 27 (not shown), first lever 218, see also Fig. 26 (not shown), second lever 219, see also Fig. 25 (not shown) and platform 220, see also Fig. 24 (not shown) are of a unitary construction made up of steel tubes, angle irons and channel irons. The base includes as a main member a rectangular tube 222 extending across the central portion of the scale from back to front and carrying a side piece 229 from which a transducer 233 is mounted via spacing member 235. At the front and rear ends of the tube 222 are welded pairs 223/ 224, 225/226 of vertical angle irons, and to the top of each pair is welded an inverted channel iron 230, 231. The levers 218, 219 are of tubular construction and pivotally mounted by flexice strips from the long and short flanges respectively of the channel irons 230, 231. The platform 220 includes a depending leg 310-313 at each corner, the legs being connected longitudinally of the scale by members 314, 315 and transversely of the scale by members 316, 317. The transverse members 316, 317 are suspended from the ends of lever arms 272, 273, 284, 285 by flexible cables (324) Figs. 18a, 18b (not shown). Flexible cables also inter-connect the first and second levers, Fig. 23b (not shown) and the first lever and the load cell Fig. 23a, (not shown).