Patent GB-635246-A (GB)
Title: Improvements in calendar time pieces
IPC: G04B19/253
Filed: 1947-06-26
Abstract: 635,246. Date-indicators. PAAUWE'S VOLAUTOMATISCHE HALENDERUURWERKEN N.V. June 26, 1947, No. 16940. Convention date, March 3. [Class 106 (iv)] A time-piece adapted to indicate the days, dates and months of the year, set respectively on flat rings automatically turned at appropriate times to expose the desired indications through a window, is characterized in that the dates 1-15 and 31 are set on the lower of two superimposed rings and on the other the dates 16-30, and a window through which the dates on the lower ring appear successively, each ring having inner or outer circumferential teeth co-operating with pawls on levers oscillated by a common clock-driven lever. A toothed wheel 1 on the hour-hand sleeve of a clock drives a toothed wheel 2 secured to a disc 3 having a nose 5, recess 6 and pin 4 which co-operate with a pin 10, nose 57 and recess 11 of an actuating lever 7 pivoted at 8, where a lever 12 is also pivoted and spring-pressed toward the lever 7 so that the two levers 7 and 12 are reciprocated to the right and back, as shown in Fig. 1, once every 24 hours. At each reciprocation of the levers 7, 12 a pawl 25 on a lever 24 pivoted to the lever 7 advances a day-name ring 41 through an external toothed rim 42, while a pawl 16 on a lever 15 pivoted to the lever 12 advances a datering through an internal toothed rim, the action being controlled by a lever 17 pivoted at 20, while again at the end of each month a pawl 31 on a lever 28 pivoted to the lever 7 advances a month ring 52 through an external toothed ring 53, the action being controlled by a lever 34 pivoted at 33. Two superimposed date rings bear the numbers 1-15 and 31 on the lower 43, and 16-30 and a window 45 on the upper 44, their outer radii are equal, but the lower toothed inner rim is hidden by the upper except for one shallow tooth 58 in the upper ring which allows a tooth of the lower ring to project into the path of the pawl 16 and block the tooth 58 itself except when one deeprooted tooth of the lower ring allows the pawl to co-operate with both the upper and lower tooth. Thus at the beginning of a month the shallow tooth 58 of the upper ring is in position to allow the pawl 16 to advance the lower ring day by day to display the dates 1-15 successively through the window 45 in the upper ring, then the deep tooth of the lower ring allows the pawl 16 to advance both rings to display the date 16 and move the shallow tooth 58 out of range of the pawl 16 so that on successive days the dates up to the 30th will be displayed, then if the month has 31 days a pawl 19 on the lever 17 will register with one of seven grooves 54 in the inner rim of the month ring and similar grooves 46, 47 in the outer rims of the rings 43, 44 will coincide and register with another pawl 18 on the lever 17, thus causing the lever 15 to move so that the pawl 16 co-operates with another tooth of the upper ring to bring the window 45 over the date 31, whereas, if the month has 30 days, the pawl 19 will have no groove to slip into and consequently the pawl 16 will co-operate with the now co-incident tooth 58 of the upper ring and deep tooth of the lower ring so as to move both rings so that the date 1 will be displayed through the window 45. During each month a pawl 35 on the lever 34 bears on the outer rims of the rings 43, 44 so that the lever 34 bearing on an arm 32 of the lever 28 holds the pawl 31 free from the month ring, on the 30th of the month a shallow part of a recess 48 in the outer rim of the date ring 44 is superimposed over a deeper recess 49 in the outer rim of the date ring 43 so that the lever 28 moves in and if it is the end of a 30-day month the pawl 31 is in position to engage a high tooth on the month ring 52, if it is a 31-day month the pawl 31 is still clear of the lower tooth on the month ring 52 corresponding thereto but the next day a deeper part of the recess 48 is superimposed over the recess 49 so that the lever 28 moves in further and the pawl 31 is in position to engage the lever tooth of the month ring. The months may be adjusted independently by a spring-pawl 40 manipulated by a lever 37, 39 and the dates by the lever 12, which may be manipulated independently of the lever 12. A disc 9 covers the clockwork and supports the pivots 8, 20 and 33 and also guide means between the month ring and date rings with suitable gaps for the pawls 35, 18, 19. A narrow stationary ring separates the two month rings 43, 44. A clock dial is mounted over the rings 41, 43, 44 and 52 and has a window 61 to expose the date and day and month names.