Patent GB-191316036-A (GB)
Title: Improvements in and relating to Calculating Machines.
Inventor: FELT DORR EUGENE
Filed: 1913-07-11
Granted: 1914-09-11
Abstract: 16,036. Felt, D. E. July 12, 1912, [Convention date]. Adding-apparatus.-Relates to multiple-bank key set and operated machines, of the kind referred to in Specifications 13,094/04, 5387/09, 9509/09, 25,766/09, 1622/10, and 26,772/12, which are now provided with means whereby the partial stroke of a key results in locking all the other keys, and with improved means for holding the numeral wheels of the totalizer locked during a partial stroke. An auxiliary or partial - stroke lever operates locking- mechanism for the keys of other orders and indirectly mechanism simultaneously locking the remaining keys of the same order. The key finger-plates 24, Fig. 14, are mounted on spring tubes 30, depressible independently of the stem and the side wings 27, and effecting the release of the key itself by depressing the auxiliary lever 37, Fig. 19, of its bank. A pin 38 upon this lever brings about the longitudinal sliding, through suitable connexions, of a key-lock bar 28, Fig. 1, so as to carry the projections 29 thereon from under lugs 70 upon the main part of the key stems. The connexions between the auxiliary lever and the key-lock bar are also employed to increase the tension of a spring 46 tending to depress the pivoted column-actuator 23, Fig. 5. The depressed key carries down with it the column-actuator, the auxiliary lever, and either the odd or the even key stop-lever, depending upon the value, the stop-lever cooperating with other levers 90, 91 to rock the link 54, Fig. 3, anticlockwise until latched in the new position by the dropping of a swinging stop 68, Fig. 25, behind an arm 67, whereby a detent-lever 50 connected to the link 54 is withdrawn from the numeral wheel 21 at the termination of the downstroke of the key. The parts remain in this position until the return of the column - actuator to normal displaces the stop 68. Partial depression followed by release of a key results in the locking down of the key by projections 29, Fig. 1, of the locking-plate passing above the lugs 70 upon the key-stems. Completion of the depression. restores the key, but the whole of the keys then become locked. Anv depression of a key results, through the locking - bar 28 and link 47, in a lengthways movement of the lever 54 forward, and since support is also removed by the descent of the column-actuator from a foot 61, Fig. 3, at the rear of this lever, a projection 161 is drawn from off a cross-bar 63 and drops slightly in front thereof. When the partially - depressed key is released the column-actuator is held down by the numeral-wheel detent, hut the auxiliary lever rises slightly and with it the link 47 moves rearwards, pressing the cross-bar 63, Fig. 25, rearwards, where it is held by the hooked ends of levers 62 which fall and swing column hooks 78 into position to catch and engage hooks 79 upon the column-actuators. All the columnactuators but that containing the partiallydepressed key are thus locked, and, upon the complete depression and release of that key. its column is also locked, the other keys thereof being previously locked by the locking-bar 28. To free the keyboard for subsequent operation it is necessary to depress a key 81 and thereby to lift the hooks 62.