Patent GB-466933-A (GB)
Abstract: 466,933. Calculating - apparatus. DURAND, M. P. Aug. 24, 1936, No. 23195. Convention date, Nov. 16, 1935. [Class 106 (i)] Multiplying - apparatus.-In a machine having means for setting both factors and employing members shaped to represent the partial products the members are displaced in two directions at right-angles in accordance with the setting of the factors and feeler members co-operate therewith to sum up the movements in proper denominational order and transmit the movements-to a totalizer in a single cycle of operation. In one form as shown in Figs. 3 and 5 to 8, the shaped members are constituted by blocks 18A, 18B stepped to represent the units and tens values of the digits multiplied by themselves. The blocks are arranged in four rows of four and are supported and guided on bars 19, 20 arranged at rightangles. The bars 19 are slidable on guide plates 32, 33 and are provided with slots engaging arms 38, 41 carried by a shaft 40 on pivots 43. The arm 38 ends in a pointer 37 that co-operates with scales 36. A similar arrangement with arms 38<1>, pointers 371 and scales 36<1>, is connected with the bars 20. Feelers 21, 23 are provided to engage the units and tens steps of the blocks set in alignment therewith ; each feeler 21 is guided by an aperture in a plate 11 and by a tail piece 30 and is under the control of a spring 46 and each of the feelers 23 is guided on a rod 25 and under the control of a spring 45. The feelers 21, 23 also carry pulleys 29, 27 and those pulleys that are arranged in lines parallel to the diagonal 7-7, Fig. 6, are interconnected by means of flexible wires 62 passing around the pulleys and around guide members 63. Each of the wires is secured to a pulley at one end 62x and passes round a spring-controlled drum 64 at the other end, each drum 64 being attached to a corresponding numeral drum 65 of the totalizer. Before the factors are set the feelers 21, 23 are moved to an inoperative position by the action of plates 47, 48. These plates have threaded bosses engaging four screw threaded rods 49 each carrying a sprocket wheel 50 with which engages an endless chain 51. To the chain is secured a member 52 attached to a slide 53 movably along a bar 54. When the slide 53 is moved to the right-hand end position, Fig. 5, it is gripped and held by a latch member 58. During this movement the chain rotates the rods 49 and the plates 47, 48 are drawn together to lower the feelers 21 and raise the feelers 23 to disengaging position. The factors can then be set and the latch 58 is released and the slide 53 under the action of the spring 55 is pulled to the left and effects the restoration of the plates 47, 48 and permits the feelers to engage the steps of the blocks presented thereto. The movements in the diagonal planes are summed up and transmitted by the wires 62 to the respective numeral drums. Transfer between adjacent denominations is effected by a Geneva-type arrangement as shown in Fig. 4 ; each numeral drum 65 carries a notched disc 68 and transfer tooth that co-operates with a wheel 69 secured to a drum 70 loose on a spindle 71 and to which the end 62x of the wire of the next higher denomination is attached. At transfer a step movement is imparted to the drum 70 to wind up a length of wire corresponding to a unit. To avoid overloading, the drum 65 is provided with a pinion 72 meshing with a wheel 73 fast on the spindle 71 and connected to the drum 70 by a spiral spring 74. In a modified construction, the stepped blocks are separated into blocks 18A, 18B, Fig. 9, for the units and tens. These blocks carry the pulleys 29, ,27 that carry the wires 62 and are adapted to slide on guides 83. The displacements of the bars 19, 20 according to the factors entered set feelers 84, and the blocks 18A, 18B are then moved until arrested by the feelers.