Patent GB-190413094-A (GB)
Title: Improvements in or relating to Calculating Machines
Filed: 1904-06-09
Granted: 1904-07-28
Abstract: 13,094. Lake, H. H., [Felt & Tarrant Manufacturing Co.]. June 9. Calculating - apparatus. -Improvements are described in the keyboard adding-machines of the type shown in Specification No. 17,136, A.D. 1889, for rendering the key. touch lighter by the use of arresting-mechanism for the operating- segments, whereby numeral wheels of less strength may be employed, and for allowing simultaneous setting of several keys by the use of molified transferring-gear. The projections 29 on the keys 28 which are shown in the longitudinal section between the column rows of Fig. 4, engage and depress the swinging lever 30, pivoted at 122 and carrying the operating-segment 31 in gear with the pinion 34 of the register, there being one such lever for each denomination. Other pins upon the keys depress the levers 86 or 87, according as they are odd or even, and, by depressing the arms 90, 91, throw pins 95 or 96 into the path of ratchet teeth upon the descending segment the register being actuated as the segments are raised by the springs 103 attached to the slightly-skewed bar 102 until the ends strike the bar 26 immediately before the numeral wheels of the register are themselves brought to rest. Springs on the arms carrying the arresting-pins 95, 96 return the levers 86, 87 to the stop 101, and the keys are returned by springs 104 which force upwards V-shaped frames 105, Fig. 11, furnished with lugs 106, fitting into notches in the longitudinal plates 107, and holes 112 which receive the bent lower ends of the key-stems so as to support them on the plate. The celluloid rims 32, Fig. 8, of the numeral wheels have internal flanges 113 gripped between the rims 115 of the discs 117 and other discs 114, and these parts, together with the transferring-pinions 40, the pin-wheel 77, and the disc 36, Fig. 9, carrying a spring-pressed pawl 35, are all fast on a hub 116 which rotates freely on the spindle 33. The driving-pinion 34 carries the internal ratchet 37, Fig. 10, with which the pawl engages, the arrangement thus employing centrifugal force to assist in keeping the ratchet and pawl in gear. Figs. 15 and 27 show the transferring and locking arrangements in the registering-train. The pinions 40 gear with wheels 41 of twice their diameter, rotating them in opposition to a spring 43 which is attached to the wheel at one end and at the other to a sleeve 44, the projecting arm 45 of which is normally locked by one of the detents 46, 47. These detents are pivoted at 48, 49 and drawn together by the spring 51 so that an arm 50 on each may lock with the spindle of the other. The wheel is provided with a semicircular guard 54, ensuring that only one detent shall be out of the locking-position for the arm, whereby, as the roller 53 moves round with the wheel and throws one detent out of gear with the arm 45, the sleeve, if unlocked, can only be rotated through half a revolution by the wound-up spring. When an operating-segment is moved down, the pin 67 allows the bent lever 73 to fall, a notch therein engages with projections 71 on the sleeve 44, and the full half-revolution cannot take place for transferring purposes until the segment of the denomination carried-to has risen to normal position. When the segment has risen, if the transferring-point has been reached, the cams 160 will displace the three-armed detent 173, 172, 174 and likewise trip the lever 162 pivoted at 66, the arm 169 of which is momentarily free from the detent. This lever carries the transferring-pawl 163 and detent 166, both in gear with the pin-wheel 77, the pawl being kept in by the spring 165, and the detent similarly urged out, but normally locked by the roller 176 on the segment, and as these parts advance together the detent escapes, and the tooth 168 prevents an overthrow. A spring 99 returns the lever. Fig. 23 shows the spring 43 which stores up from the keys the energy for the transferring-movements. It consists of three series of concentric and integral coils wound in reverse directions, gives the same restoring-force for any displacement, and will store up the power due to simultaneous operation of keys of different denominations.