Patent GB-166489-A (GB)
Abstract: 166,489. Rauchwetter, F. July 7, 1914. Multiplying and dividing apparatus of the type employing plates having notches or recesses representing the products of the simple numbers in units s and tens comprises a single group of nine product plates arranged on an axis at equal angular distances apart and two groups of toothed racks, one for the units and one for the tens, which co-operate with the product plates in such a manner that they are positively and simultaneously moved through a distance corresponding to the numerical value represented by the product plate and transmit the movement to a differential mechanism so as to set stop pins which on an operation of the main handle cooperate with a differential actuating mechanism to actuate a totalizing-counter in a known manner. Associated with each bank of multiplicand keys 40, Fig. 1<a>, is a pair of pinions 16, 17, adapted to be set with respect to the groups of racks 3, 4 in a manner depending on the particular key depressed, as described in Specification 166,468. The nine product plates 2 are mounted on a shaft 1, Fig. 4, and each is adapted to be moved to operative position, i.e. opposite the groups of racks 3, 4 on the depression of a particular multiplier key 12, Fig. 6, by means of a notched bar 13, lever 14, sector 15, and cardan shaft 15'. An actuation of the main handle 7, Figs. 4 and 4a, through gearing 9, link 10, and bell crank levers 11 causes the displacement of the shaft 1 carrying the product plates 2 and thereby the racks 3, 4 so as to rotate the previously set pinions 16, 17. The pinions 16 are mounted on squared shafts and carry worms 19, 19<1>, Fig. 8, at one end thereof, the worm 19 for the lowest denomination being fixed while the arms 19<1> are axially movable. The pinions 17 are adapted to rotate a member with a helical grouve 24 and by means of a projection 23 keyed on a rod 21 the latter is axially displaced and the worm 19<1> of next higher denomination is axially moved by means of the projecting flanges 20 on the rod 21 which engages a groove 22 on the said worm 19<1>. The worms engage pinions 25, 25<1> to which are connected arms 26, 27 having projecting pins extending into the plane of a claw-like differential actuating mechanism 28, 29, 29<1>, Fig. 1<a>, operated from the main shaft by means of a link 29<11>, 29<111> and a pivoted lever 28<1> connected to the jaw 29 at 28" and to the other jaw by a pin-and-slot connection 28<11>. To carryover the tens in that denomination in which the sum of the units and tens exceeds " 10," the arm 26 is provided with a projecting portion 36, Fig. 9, which when the carry-over is to be effected engages the end 37 of a bell-crank lever 33 and rocks this lever about its pivot 34 so as to withdraw a stop 32<1> thereon from engagement with a notch in the framework and at the same time to position a second stop 32 in the path of a cam disc 39 actuated by the main operating mechanism which is adapted to rock the lever 33 about a second pivot 35 and, by reason of its engagement with the flange 20, to turn the rod 21, whereupon the rod 21 is displaced to advance the next higher wheel 25<1> one step. In a modified construction as shown in Figs. 1<a>, 16, and 17<a>, the pinions 16, 17 are axially displaced, and the shaft 58 is provided with a screw-threaded portion 52 connected by a stirrup 53 to an oppositely directed screw-threaded portion 54 on the slidable axle 55 of the pinion 16 of next higher denomination so that when the pinion 16 rotates, the stirrup acts as a nut to displace the piece 54 longitudinally, and that when the pinion 17 rotates, the piece 52 is rotated to advance the stirrup and screwed portion 54. The movement is communicated by a toothed roller 56 to a sector carrying arms 26, 27. When the arm 26 is moved through more than ten units, transfer is effected by a part 69 thereon which is moved into the path of the free end of a lever 60 pivoted at its centre to a lever 66 and engaging at its other end a pin 59 on the stirrup. A roller 67 at the pivot of the lever 60 is adapted to be pushed sideways by a cam-disc 68 operated from the main shaft so as to rock the stirrup and thereby through the turning movement on the portion 52 to cause it and the portion 54 to move longitudinally an additional unit.