Patent GB-249716-A (GB)
Title: Improvements in and relating to computing weighing scales
IPC: G01G19/42
Filed: 1925-06-24
Abstract: 249,716. Marks, E. C. R., (Watson Experimental Laboratory Co.). June 24, 1925. Multiple-indication apparatus.-In a weighing- scale for determining the number of articles in a mass of like articles or for computing the money value of a commodity at a given price per pound a load balancing mechanism is operatively connected to one of the indicating members which is movable to and from a normal position, and means independent of the load-balancing mechanism is adapted to adjust the other indicating member so as to intersect the first indicating member in accordance with the unit of computation. either manually or by means of a unit balance. As shown in Figs. 2 and 4, the load balance comprises a lever 16 secured to a hub 17 mounted on knife edges 18 and arms 20 with knife-edge pivots for the load receptacle 22. The lever 16 is connected by a metallic ribbon 45 to a load-balancing mechanism 36 comprising a cam 43 and arms 37 - - 39. To the arm 37 is attached an indicating pointer 145 co-operating with a weights scale 147. The upper end of the arm 37 carries a counter-balanced lever 54 to one end of which is pivotally attached a plate 59 secured to the chart 14, Fig. 13. This chart has a central series of graduated and tabular computations in accordance with the number of parts in a unit and is guided for movement parallel to itself by means of a wire 63 tensioned as shown in Fig. 2 between adjustable collars on screws 66, 72. The wire 63 .passes between the axis of the plate 59 and a pin 75 thereon and between projecting pins 77 or an arm 76, Fig. 1, integral with the plate 59, frictional resistance between the parts being eliminated by balance weights 78, 79. The unit balance receptacle 115 is connected by a system of parallel links 111, 116 to a metallic ribbon 123 connected at its upper end to a pendulum balance supporting member 100 which carries the second indicating member 15 constituted by a wire that is connected at its lower end to an offset lever 104 and at its upper end to a spring 105 on a lug 106 of a bracket 107 pivotally mounted for adjustment on the support 100. The pivot of the wire passes through the zero graduabion of the chart 14 when in its normal position. The unit balance is provided with counterweights 127, 128 arranged on an extension of the link 111 and the zero is adjusted by a screw 131 at the outer end thereof. The lower end of the indicating wire 15 co-operates with a scale 132 having three sets of graduations comprising an arbitrary numerical scale 135 an upper price per pound scale 133 and a weight scale 136 which may be utilized to determine the position of the wire when the weight of the unit is known. To set the wire manually an external knob 143 is rotated whereupon a pinion 141 depresses a rack 137, Figs. 2 and 12, to force the link 111 downwards to adjust the indicating wire. To offset the tare weight of the scoop or other container the hub 17 is provided with an arm 148, Fig. 2, having a weight 149 pivoted thereto adapted to be set in the " on " or " off " position as determined by stops 150. To compensate for scoops other than those of standard weight a poise weight 152 is provided on a tare beam 151. The load and unit balances are furnished with dashpots 154, 155 to control their vibrations. Each dash-pot is provided with a bye-pass 162, Fig. 6, controlled by a valve 163' to regulate the flow of liquid.