Patent GB-191119694-A (GB)
Title: Adding and Computing Machine.
Inventor: HEIDE HENRY CONRAD
Filed: 1911-09-04
Granted: 1912-09-04
Abstract: 19,694. Heide, H. C., [Dalton Adding Machine Co.]. Sept. 4. Adding - apparatus; multiplying by repetition. - In multiplebank adding - machines of the Burroughs and like types, as described, for example, in Specific a t i o n 17,126/93, having a multiplying or repeat key adapted to prevent, as usual, the restoration of the setting - parts after a single operation of the main lever, the setting- up of the multiplicand on the keyboard positions certain parts so that, when a special key is actuated, numeralkeys of the next higher denomination but of corresponding value are automatically depressed. This operation results in the setting-up of a new multiplicand equivalent to the previous multiplicand multiplied by ten. Multiplication by the tens, hundreds, &c. digits of the multipliers can thus be proceeded with as usual by repeated addition. In-the normal machine, upon the depression of one of the setting-keys 2, Fig. 4, of any bank, its stem rocks a spring-controlled lever 3, thus carrying rearwards a spring-controlled locking-bar or slide 6 which is thereupon engaged bv a denominational latch 11. The shoulder 8, Figs. 9 and 10, of the lever 3 engages the forward end of one of the slots in the bar, and the key is therefore locked in position until the latch 11 is released. This release is normally effected at the end of each operation of the main lever of the machine by a bail 29, Fig. 2, the rod 30 of which is moved rearwards by a cam surface on a spring-controlled togglelever 24 driven from the main shaft 19 through an arm 21 and bell-crank lever 22. If, however, the repeat key 32 is depressed, the lever 33 engages a stud on the lever 22 and maintains the lever 22 in the position shown in Fig. 2, in which it is above the rod 30. The latches 11 for the locking-slides 6 can be separately released and the depressed keys restored by corresponding denominational error-keys 56, which rock the latches through levers 57, or all the engaged latches can be released by a universal error-key 58, which is connected to and adapted to rock the bail 29 through a lever and slotted link 59. According to the invention, the spring-controlled levers 3, when rocked by the depressed keys, slide forward slotted spring- controlled hooks 35, by means of pins 39, so that the hooks are positioned immediately above pins 40 on the corresponding adjacent keys of higher value. The hooks are prevented from rotating by means of arms 34, fixed to the shaft 4 and having pins 38 which engage in slots in the hooks. When the special multiplying-key 45, 44, Fig. 11, is actuated, all the shafts 4 are rocked bv means of a lever 43, link 42. and arms 41 ; the initial rearward motion of the link carries a pivoted tappet-piece 46 against a pin on a lever 51, thereby rocking the bail 29 and momentarily releasing all the latches 11 and depressed keys. The hooks 35 have, however, been sufficiently rocked by the link 42 and arms 41 to engage the pins 40 on the keys referred to, and to prevent any rearward motion due to the tension of their springs. The further rearward movement of the link 42 causes the hooks to depress these keys so that they are locked by the locking-slides 6 and latches 11, such continued movement of the link having carried the tappet 46 above the pin on the lever 51 owing to the engagement of its tail 49 with a pin 47. Upon the'release of the special key, the hooks 35 return to normal position, but those that on their return movement engage pins 39 on levers 3 corresponding to the keys thus newly actuated are slid forwards and, engaging the pins 40, slightly rock the corresponding keys 2 against springs 2b, this slight movement being permitted to the key-stems by recesses 2<a>. The hooks are thus enabled to take up their correct positions over the pins 40 of the keys adjacent and corresponding to those newly depressed. Printing is effected by the usual mechanism of the Burroughs machines.