Patent GB-613851-A (GB)
Abstract: 613,851. Calculating-apparatus. LAFLEUR, H. J. H. Dec. 20, 1945, No. 34625. Convention date, Dec. 10, 1942. [Class 106 (i)] In an apparatus for the four rules, the digits of the first factor of a multiplication are set by depressing pins 25 arranged in denominational sets on a rotatable carrier 24. Beneath the pins is a disc 15 carrying nine sets of flexible tongues having ridges l of lengths corresponding to the partial products, alternate ridges, considered in a radial direction, relating to tens and units respectively. The disc 15 has a rim 16 on which are marked the digits 1 ... 9 designating the adjacent sets of partial-product tongues. Beneath the disc 15 is a sector comprising nine flexible arms 14. The first digit of the second factor is set by turning the rim 16 until the said digit on the rim is in a datum position above the rest position of the flexible arms 14. The corresponding partialproduct ridges l are thus brought above the flexible arms. A toothed wheel 6 projecting through the casing is then given one rotation by hand. This through a pinion 5 turns a sleeve 3 through two revolutions. The flexible arms 14 and the disc 15 carrying the partialproduct ridges l are driven by the sleeve 3, the sets of pins 25 remaining stationary. As the ridges l pass under the set pins 25 they are depressed and in turn depress the flexible arms 14 which again in turn depress flexible fingers 12 also driven by the sleeve 3. These fingers 12 are thus engaged with teeth 40 on numeral wheels 13 and drive these numeral wheels amounts corresponding to the tens values of the partial product. During the first revolution of the sleeve 3, an arm 35 thereon engages in turn and drives a pinion 33, Fig. 3, adjacent each set of pins 25, the pinion having a cam 34 which pushes the whole set of pins to the left so that, during the second rotation of the sleeve 3, the set pins 25 co-operate with the units ridges of the chosen partial-product ridges to add the units figure into the numeral wheels. To give the correct denominational value to the partial products, the pins 25 are moved one step relatively to the numeral wheels upon each rotation of the sleeve 3 by teeth 18 on a disc fixed to the sleeve engaging pinions 20, 21 on a fixed arm 19, the pinion 21 engaging teeth on the inner part of the carrier 24 supporting the pins. Three slidable rings 57 marked with tables of partial products are mounted inside a cover 55 for use in division problems. Adding and subtracting. Each numeral wheel 13 may be rotated for adding or subtracting by moving a stylus in a. slot 49, Fig. 1, the stylus passing between arms 10 to depress a flexible plate 47, Fig. 2, to press the fingers 12 into engagement with the numeral wheel 13. The arms 10 are connected to the hub of the fingers 12 and the stylus is moved to the end of the slot, it rotates the arms 10 and hence the fingers 12 to drive the numeral wheel. The slots 49 are graduated in two opposite directions for addition and subtraction respectively. Transfer mechanism. As each numeral wheel 13, Fig. 1, passes through zero, a cam 46 thereon depresses one end of a lever 44, whereby the other end is lifted to lift one of a set of springy teeth 41 on the next higher wheel into engagement with the rotating actuating fingers 12, whereby this higher wheel is moved through one step.