Patent GB-694165-A (GB)
Title: Improvements in change speed gearing for computing mechanism
IPC: B67D7/22
Filed: 1949-05-16
Abstract: 694,165. Counting-apparatus. TRIGGS, W. W. (Veeder-Root, Inc.). May 16, 1949, No. 13018/49. Class 106 (i). [Also in Group XXIV] Change-speed gearing for fluid-dispensing apparatus having a total-cost register comprises a series of gears secured to an input shaft, each of which has one tooth more than the preceding gear, three auxiliary shafts each carrying a relatively slidable but non-rotatable gear to be driven by a selected one of the series of gears, gearing to combine the movements of the auxiliary shafts. in predetermined proportions and to drive an output shaft, and price indicators set independently in accordance with the positioning of the respective driven gears so as to afford a complete price indication which corresponds with the overall gear ratio between the input and output shafts. A petrol pump is coupled to a shaft 22 mounted in a casing 21 and geared to a second shaft (not shown), adapted to operate a register for the amount of petrol dispensed. The shaft 22 is also coupled, through change-speed gearing, to a bevel wheel 30 arranged to drive a register for the total cost of the petrol dispensed. Change-speed gearing. Fast to the shaft 22 are gears 51 and 50, having twenty-seven and eighteen teeth respectively, and a cone 20 of eleven gears having nine to nineteen teeth respectively. Three auxiliary shafts 52-54 are driven by selected ones of these gears and, for this purpose, a gear, e.g. 66, is keyed to, but slidable along, each shaft. The gears 66 are slid along their shafts by means of setting levers 31-33 and each is constantly in mesh with an idler pinion, e.g. 69, carried by the setting lever. The setting levers pass through slots in curved plates 71, 72 and the casing 21 but are normally protected by hinged covers 34, 35. Spring detents 75 on the setting levers co-operate with small holes and notches in the plates 71, 72 to ensure that the idler pinions 69 are in proper engagement with the selected gears on the shaft 22, the detents being disengaged and the levers being swung to disengage the idler pinions and then moved longitudinally along their shafts when it is desired to alter the gear ratios selected. The auxiliary shaft 54 drives a gear 112 free on the shaft 53 and forming part of an epicyclic gearing including a sun-wheel 113 fast on the shaft 53 by which the rotations of the two shafts are combined and applied to a gear 107. A gear 102, mounted on the third auxiliary shaft 52, is geared to the gear 107 and its motion is combined with that of a sun wheel 100 fast on the shaft 52, by a further epicyclic gearing which drives the bevel wheel 30. The setting lever 33 has ten positions in which its idler pinion meshes with the gears of the cone 20 having ten to nineteen teeth respectively and the epicyclic gearings are such that the corresponding components of the motion of the bevel wheel 30 are proportional to 1.0 to 1.9 cents. The setting lever 32 also has ten positions in which its shaft is driven from the gears of the cone having nine to eighteen teeth respectively, the corresponding components being proportional to 9 to 18 cents. The idler pinion of the lever 31 can mesh with a fixed stop or with the gear of the cone having nine teeth, or with either of the gears 50, 51, which positions result in components proportional to 0, 10, 20 and 30 cents respectively. Thus the setting levers may be set for any price per unit volume from 10.0 to 49.9 cents. Indicating price per unit volume. Bars 94, 90 and 86, guided for vertical movement in the casing 21, have slots through which the setting levers 33-31 respectively pass. The bars, which are thus set vertically with the setting levers, have toothed ends which mesh with gears on front and rear shafts 97, 93 coupled with corresponding drums 42, 41 and 40 at the front and 42R, 41R and 40R at the rear, visible through slots 43, 43R in the casing. The drums set by the levers 33, 32 and 31 are respectively marked <SP>1</SP>/ 10  to <SP>9</SP>/ 10'  0 to 9 and 1 to 4 (i.e. 10 to 40) cents. Thus, while the value shown on each drum does not correspond with the associated gear ratio selected, the value shown by the three drums together does correspond with the resultant gear ratio between the input shaft 22 and output gear 30.