Patent GB-191329544-A (GB)
Title: Improvements in or relating to Alarm Clocks.
Inventor: MELLERSH-JACKSON WILLIAM JOHN
IPC: G04B23/08
Filed: 1913-12-22
Granted: 1914-08-13
Abstract: 29,544. Jackson, W. J. Mellersh-, [Yankee Wizard Clock Co.]. Dec. 22. Alarm mechanism.-Relates to an alarm clock adapted to operate on more than one day after being wound, the mechanism being automatically reset after being stopped by hand. The clock is of the kind in which minute-setting mechanism is provided in addition to an hour-setting device. According to this invention, a releasing - device, which in the normal position sets free the alarm mechanism at a predetermined time, may be moved to another position in which the mechanism is prevented from operating at all, or may be set in a 'third position so that only the minute-setting mechanism is operative. A further feature of the invention is a bell which may be placed in either of two definie positions, in which it is either within or out of range of the alarm hammer. The hammer-arbor 55, Figs. 8 and 10, carries three projections 57, 58, 59. One, 57, of these is adapted to engage with part of a sliding rod 61 when the rod is pushed in, thus interrupting the operation of the alarm. The projection 59 engages with a trip spring 41, co-operating with a minute-setting device ; and the projection 58 engages with the inturned end 70 of a resilient bent lever 64, 67, the upper arm 64 of which rests against the hub of a twenty-four hour wheel 45. The lever 64, 67, the end 70 of which is stepped as shown, may be turned about its pivot 65 into three definite positions. When placed so that the position of its end 70 with respect to the projection 58 is as shown in Fig. 12, the release of the piece 58 takes place in the usual manner by the outward movement of the wheel 45 at a time determined by the position of the hour - setting pointer 48. The hammer-shaft is not, however, freed until the release of the projection 59 from the spring 41 has also occurred. The precise minute at which this takes place is determined by the mechanism shown in Fig. 14. This comprises the usual pin- and-notch device, the notch being provided in a collar 33 upon a sleeve 31. The sleeve is set in the required position by means of an arm 30, the outer end of which is connected to a rotary graduated ring surrounding the dial. By shifting the end 70 of the lever 64, 67 into the position shown in Fig. 11, the operation of the alarm is altogether prevented. In a third position, the projection 58 is always free of the part 70, so that the alarm is controlled only by the minute setting device. If the action of the alarm is stopped by pushing in the rod 61 so as to engage the projection 57, during the subsequent rotation and sliding movement of the wheel 45, the rod 61 is pushed back to free the part 57, the rod being extended through the plate 44 for this purpose. It is therefore unnecessary to withdraw the stopping-member 61 by hand in order to allow the alarm mechanism to operate again after the lapse of twenty-four hours. Fig. 2 shows the movable bell 74. It is pivoted eccentrically at 78 to a support on the back of the clock case, so that by turning it into the position shown in dotted lines, the bell is out of range of the hammer 75, and a buzzing sound results when the alarm mechanism is liberated. A spring catch 79 on the bell holds it in either the normal or the displaced position.