Patent GB-190321573-A (GB)
Title: Automatic Calendar.
Inventor: TILMANT JULES
Filed: 1903-10-07
Granted: 1903-12-10
Abstract: 21,573. Tilmant, J. Oct. 7. Date indicators. -In a calendar mechanism for indicating the day of week, the month, and the day of the month, on the assumption that a leap. year occurs once in every four years, a clock 14, Fig. 1, drives a pinwheel 15 which causes an oscillation of the lever 16 once a day. There are openings 11, 13 for the day and month indications on the revoluble cylinders 67, 66, Fig. 2, and apertures 12 for the date, of which the tens figure is borne by a disc 20, having holes 22 through one of which appears the unit figure borne by the coaxial disc 21, Fig. 5. The hollow spindle 23 is driven by a spring barrel 28 through gearing 27, 26 under the control of a pinwheel 24, and escapement pallets 29 on the arm 30 of a three-armed lever, operated by the driving-lever 16 through an arm 34 and pin 33 gearing with the uppermost arm 32 of the three. Carrying- on is effected by a pin 37 on the opposite face of the pin - wheel, which actuates the forked lever 42 through the lever 39 and rod 40, Fig. 7, pallets 43 on the lever regulating the advance of four pins on the wheel 45, which is keyed to the spindle 46 of the tens' disc and is also driven from the spring barrel. The distance through which the arm 16 is moved by the spring 52, when the pin 15 releases it, is determined by the flexible plate 53, which normally strikes against the rim 54, the rim being so positioned and moved that on the last day of the month the plate passes through an aperture therein. For this purpose, the rim is revolved by a pinion on the wheel 24 and an intermediate wheel 56 which is carried by a lever 57 provided with a pin 59, so that the long stroke of the lever 32 will throw the intermediate wheel out of gear with the teeth 55 of the rim, and allow the spring 60 to rotate the latter in the opposite direction until the tappet 68 thereon is locked by meeting one of the surfaces of a cam wheel 65, which is driven bya tooth on the spindle of the rim 54 so as to rotate once in 48 months, and has projections and recesses corresponding to the lengths of the 48 months. A dial and hand 69 for setting this wheel are shown in Fig. 7. When the long stroke occurs, the pallets 29 disengage the pin-wheel 24, which then moves into the position displaying " 1 " on the units disc, as determined by the pin 35 and projection 36. The movement of the lever 42 is normally limited by the fall of the pin 50 thereon upon the stop 85 carried by a hanging bar 86, but on the stroke of the lever 57 a pin 70 displaces the stop, the lever descends, and the wheel 45 rotates until the projection 51 meets the pin 50, the tens disc being then in position for the first day of the month, the bar 86 being pressed back into place by a spring when the lever 42 next rises. The day indication is changed by the star-wheel 75, detents 79, 80, driving pawl 74, and links 72, 73, the former driven by the arm 34. To allow for the long stroke of the arm there is a vertical slot in the link 72, and the spring 78 keeps the top of this slot normally in contact with a pin on the arm 34. A similar arrangement is shown in Fig. 2 for feeding the month cylinder at every long stroke of the arm. A guiding-fork prevents warping of the discs 20, 21.