GB448661A - Improvements in and relating to clocks, watches and the like - Google Patents

Abstract

448,661. Time-indicating mechanism. ELECTRIC AUTO-LITE CO., and LINER, J. I., Champlain Street, Toledo, Ohio, U.S.A. Aug. 7, 1935, No. 22322. [Class 139] Time-indicating mechanism includes a member 38 with time-indicating marks thereon which is moved continuously and regularly, a second member (shutter) 63 associated with the movable member for displaying only a selected time indicating mark, means for moving the two members 38, 63 at the same rate and means 81, 82 for causing periodically (e.g. once an hour) a relative movement between the two members. An hour disc 38, minute disc 42, and seconds disc 55 are rotated through gearing from an A.C. synchronous motor ; the hour and minute discs are partially exposed at openings 35, 50 in the fixed plate 11 and the seconds disc has an arrow 58 rotating in opening 60. Between the hour disc 38 and plate 11 is a shutter 63 which is pivoted coaxially with the hour disc and has an opening 68 sufficient to expose one hour numeral. An arm 70 pivoted at 72 to shutter 63 is pressed inwards radially by spring 76 and has a lug 83 which coacts with twelve shoulders 84 on the hour disc so that the shutter is carried round clockwise with the hour disc. When this shutter 63 at the end of an hour reaches the end of its travel, a cam 82 on the minute disc 42 meets lug 81 on arm 70, forcing the latter out radially so that its lug 83 clears shoulder 84. A spring 85 thereupon moves the shutter 63 rapidly counterclockwise one twelfth of a revolution until lug 83 meets the next shoulder 84 and exposes the next hour numeral. During the hour that the exposed numeral moves from left to right of window 35, a mark 91 on the hour disc reads against graduations 90 on the plate 11 to give a reading of the minutes elapsed since the beginning of the hour. To prevent the shutter 63 from travelling too far clockwise, a lug 89 on it meets a fixed stop 88.