Patent GB-368311-A (GB)
Abstract: 368,311. Calculating-machines. GUSTAFSSON, E. V., 95B, Regeringsgatan, Stockholm, and HELLGREN, G. H., Karl. berg, Vallentuna, both in Sweden. Sept. 4, 1930, No. 26473. [Class 106 (i).] A calculating machine for the four rules is of the ten-key set and independently operated type and has a stationary totalizer and quotients counter and a slidable selector, means for operating any denomination of the quotients counter being adapted to be coupled to and released from the selector. Selecting mechanism. The depression of a numeral key rocks a corresponding lever 34, 36, Fig. 3, which is connected to a hammer by a cord 38. The movement of the hammer causes the projection of a tongue 64 in the selector carriage 54, the said tongue then forming a stop for the actuating members. The depression of the key also rocks a universal bar to which is secured a cord 104, Fig. 8, connected to a pawl 88 pivoted at 87 and engaging a projection 110 of a second pawl 108 pivoted at 107. The rocking of the pawl 88 moves the second pawl 108 clear of the teeth 84 of the selector carriage, the latter then moving one-half step to the left under the action of a spring, the second half step being completed when the cord 104 is released. The selector-moving spring 114, Fig. 4, acts through a lever 130 pivoted on a shaft 126 and connected by a link 132 to one axle 62 of the carriage. The carriage is restored by a bell-crank lever 128, 129 secured to the shaft 126 and having a projection 140 which can be engaged by the lip 150 of a lever 142 pivoted at 141 and controlled by a spring 144. A crank arm 154 is secured to the shaft 126 and carries a pin 156 engaging a slotted link 160 pivoted to a crank arm 164 on the main shaft 162. At the commencement of the movement of this shaft the selector carriage is locked by means not shown, the link 160 then descends and rocks the levers 154, 128, 129 in a clockwise direction until the projection 140 is locked by the lip 150. When the carriage is released it is restored by a spring 136 which connects levers 128 and 130. A pin 148 on the lever 130 lifts the lever 142 to release the projection 140. The depression of the division key 26, by means of links 452 and levers 458, 462, causes the lever 142 to be held in an inoperative position so that the selector is not restored. A similar effect is obtained by the depression of the multiplication key 24 which is connected by a link 470 to a lever 386. A lever 388 is pivoted at 384 and formed with an extension 474 connected by a link 476 to the lever 458, the levers 386, 388 being connected by a bar 394. The back-space key is connected to the lever 500, Fig. 8, pivoted at 502 and connected to the lever 86 carrying the pivot 87 for the pawl 88. The lever 86 is pivoted at 506, depression of the back-space key causing the rocking of lever 500 and the movement of the selector one step to the right. Operation of quotients counter. The bar 394, Fig. 4, has a slot 396 in which slides a pin 398 connected to .a rod 400 the end of which is formed as a connecting member 404. The depression of the multiplication key 24 or the division key 26 raises the bar 394 and brings the pin 398 into engagement with the teeth of a rack 406 secured to the selector carriage. The member 404 is thus moved with the carriage to cause the actuation of the quotients counter in any desired denomination. Each numeral wheel of this counter is attached to a pinion 306, Fig. 7, gearing with a second pinion 310. Each denominational unit is situated between two plates 304, Fig. 6, to which is pivoted a lever 314, Fig. 7, carrying two pawls 312, 313. Associated with each unit is a transfer pawl 316. Normally the connecting member 404 lies adjacent the transfer member 316 of the lowest denomination and couples it to a bar 364. The actuation is derived from two levers 350, 356 which are rocked about their pivots 326, 354 by cams on the main shaft. The lever 350 carries a rod 349 which lies on a part 330 of all the levers 314 and prevents their movement. At the beginning of the outward handle stroke, the lever 350 moves anticlockwise and frees the levers 314 but the latter do not rotate by reason of the engagement of the transfer levers 316 with them. The lever 350, through a link 376 and plates 362 rocks the bar 364 and moves the transfer lever 316 in that denomination only in which the connecting member 404 happens to be and so frees the corresponding lever 314 which, through pawl 312 and spring 328, rotates the numeral wheel 306 one halfstep. On the return stroke of the handle the lever 356 swings anticlockwise and, through a universal rod 374 engaging the pawls 313, completes the movement of the actuated numeral wheel, the pawl 312 having been withdrawn from the wheel by a rod 372 extending between the plates 360 which are rocked by the lever 356 through a link 366. Subtractive operation of quotients counter. The depression of the subtraction key moves the cams on the main shaft so that first the lever 356 and then the lever 350 are moved in an anticlockwise direction during the outward stroke while on the return stroke they move clockwise, so that the pinion 306 is rotated one step in the negative direction. Transfer mechanism. When transfer occurs the pawl 316 is rocked to free the lever 314 by the engagement of an arm 345 with a projection 347 on the lower pinion 310. Operation-determining keys. In order that the depression of the subtraction key shall cause subtraction in both the totalizer and the quotients counter and the depression of the division key shall cause subtraction in the totalizer and addition in the quotients counter and that the depression of one key shall not cause that of the other, the subtraction key lever is directly connected to the means which move the quotients counter operating cams on the main shaft. The division key lever-442, Fig. 3, has a slotted connection with a link 256 shifting the totalizer-operating cams, a lateral projection of the link engaging beneath the subtraction key lever, so that depression of the latter moves both sets of cams, depression of the division key moving the totalizer-operating cams only.