GB1057043A - Proportioning balance - Google Patents

Abstract

1,057,043. Weighing apparatus. ULSTER PRINT WORKS Ltd. April 21, 1964 [April 30, 1963], No. 16867/63. Heading G1W. Weighing apparatus which is used for simultaneously weighing out N ingredients (where N # 3) in predetermined proportions by weight comprises a main balance beam which may be formed in two tandemed portions and two scalepan assemblies which consist of N scale pans and which are each supported on different balance arms of the beam, the scale pans being so arranged that when they are filled with their respective ingredients by an amount according to the required predetermined proportions the entire weighing apparatus is in balance. As shown in Fig. 1, a main beam is formed in two portions 10 and 11 which are each supported on fixed knife edges 13 and 20 respectively and which are pivotally connected together by a movable double knife edge 19. A container 14 movably attached to one arm of the beam 10 is, after being filled with one ingredient, balanced by adding two other ingredients to respective scale pans 23, 27 of the scale pan assembly acting on a pivot 21 at one end of the beam 11. The scale pan assembly comprises a beam 12 on which the scale pans 23 and 27 are so arranged that when the three ingredients are present in their respective scale pans in the required predetermined proportions, the total weight of the scale-pan assembly is balanced by the weight of ingredient in container 14 and the scale pans 23 and 27 containing the other ingredients are balanced on the beam 12. The scale pans 23, 27 are provided with hooks 32, 30 so that they can be secured in order to facilitate their filling. The required relative proportions of the three ingredients may be adjusted by suitably moving a counterweight 17 and knife edge 19 on the beam 11 simultaneously towards or away from knife edge 20 and/or by moving a counterweight 25 and scale pan 27 on the beam 12 simultaneously towards or away from knife edge 21. These simultaneous movements are each achieved by providing rotatable threaded rods 40, 45 Fig. 2, (not shown) each having oppositely threaded portions 40a, 40b and 45a, 45b to which the counterweight 17, knife edge 19, scale pan 27 and counterweight 25 are respectively attached. The beams may be each of rectangular frame shape and the knife edges may be wheellike bearings e. g. ball or roller bearings. Each scale pan assembly may comprise a series of pivotally connected beams each carrying a scalepan.