Patent GB-331524-A (GB)
Abstract: 331,524. Hamilton, R. M. Jan. 25, 1929. Totalizators.-The total of a count is indicated by the displacement of a pointer over a scale and a number of pointers may be spaced along an endless chain to come into action in succession, the speed of the chain and the appearance of the scale being varied in accordance with the scale range displayed. The invention is described in connection with a totalizator. Display apparatus. For each horse and for the pool there is a rectilinear scale 11 vertically disposed and movable as a unit on rollers in a framework thus facilitating assembly and arrangement. Above the scale is a horse-number plate 13 constituted by two plates hinged at 17, the lower plate being capable of being turned upwards and clipped at 15 to hide the number. The scale consists of a slidable slat 21 bearing numbers from 5 to 100' and serving to conceal one or more columns of noughts on a fixed scale member 20. The pointers 12 are three in number and are mounted on an endless chain 23 at intervals equal to the height of the scale so that as one pointer leaves the scale another appears at the lower end. One pointer is arranged to pass in front of a board 22 carrying the scale divisions from 0-100 but the other pointers pass behind the board. The slat 21 is mounted on wheeled racks 40 adapted to be shifted by arms 38, 39 on geared shafts 29, 30. When the first pointer passes beyond the indication 1000, the second pointer appears above the board 22 and a pin 36 on a block 35 carried by the chain operates a fourarmed star-wheel 34 to rotate the lower shafts 29, 30 and through one of the arms 39 shift the rack 40 and slat 21 to the left to expose the range 1000-10,000. A pn 56 on the block carrying the first pointer simultaneously engages a four-armed star-wheel at the upper end to shift the top rack and so maintain parallel relationship of the slat. The chain now moves at a reduced speed and when the 10,000 total is reached a further displacement of the slat similarly occurs to exhibit the range 10,000-100,000 the speed of the chain being again reduced correspondingly. When the first pointer returns to view a couple of pins 66, 67 on the pointer block operate the star-wheel reversely to restore the slat 21 to initial position. Electrical operation. The chain 28 passes over sprocket wheels at top and bottom, that at the bottom 70, Fig. 5, having a shaft 71 with a brake drum 74 and one member of an electricallyoperated clutch 75, the other member of which is geared to a constantly running shaft 80. The electromagnets 76, 87, Fig. 9, of the clutch and brake determine the starting and stopping of the shaft 71 and are controlled by a hunter gear .comprising a much-bank contact preselector switch 90 having an operating magnet 91. The spindle - 92 of the switch 90 carries a saw-tooth cam-wheel 93 geared through an idle pinion 95 to a gear 96 on the shaft 71. Vibrating contacts 98, 99 are actuated by the cam teeth, the pitch of which corresponds to the pitch of the preselector switch contacts. A further gear 100 on the shaft 71 drives through reduction gearing 101, 102, 103 a zeroizing cam 105 with one notch 106 co-operating with a. pawl 107, movement, of which closes a pair of contacts 108, 109. The sprocket 70 is driven at the requisite speeds for the different position of the indicator slat 21 by the means shown in the diagram Fig. 9. Three preselector switches 110, 120 and 127 with their operating magnets 114, 119, 126 are employed for giving impulses at every ú5, and for one revolution ú50, switch 120, in fifty steps of ú50 counting ú2,500 for each revolution, each step being given by a contact 117, 118 made by the shaft of the switch 110 and correspondinglythrough a contact 123, 125 making steps of value ú2,500 in the third preselector switch 127 which counts up to ú100.000. A connected arc 151 of 20 contacts co-operating with the contacts 115, 116 of switch 110, which give for each ú5 counted an impulse to the indicator operating magnet 91, thus allows the indicator to count in ú5 steps up to ú1,000, after which, the arc 151 being passed, the steps are ú50, through the contacts 115, 124 and by way of the contacts 132 up to ú10,000 after which the indicator operating impulses are made through sectors 133, 134 and the contacts 136 - - 139. The breaking of the connections through 151, 121 at 128, 131 prevents the twenty contacts of sector 151 acting at each subsequent revolution of the switch 120 and the passages of contact arm 129 from the sector 132, to the sector 133 ensures the actuation of switch 90, 91 only at every ú500 through the contacts 135 - - 139. Indicators may be fitted to the switches 110, 120, 127 to enable the total to be read off from them. Zeroizing.-The indicator is zeroized by the armature of the magnet 91 through a circuit fitted with switches 138a, 139a and the switch 108, 109 actuated by the slow motion wheel 105, one circuit of which corresponds to a full run of the indicator, the zero being reached when the notch engages the arm 107 to open the contacts 108, 109. Zeroizing is initiated by closing switch 138a and momentarily breaking circuit at its push button 139a to start, the tumbler switch 98, 99. Specifications 324,658 and 326,152 are referred to.