| 摘要 |
984,224. Time alarm signals. INTERNATIONAL REGISTER CO. July 24,1961 [Aug. 17, 1960],No. 26751/61. Heading G3T. [Also in Division H2] An audible alarm interval timer is mounted on the framework 80 of an electric cooker time switch (see Division H2) and is opered by the same synchronous motor but is otherwise independent thereof. A knob on shaft 48 rotates gearing to set a cam (Figs. 17 and 18, not shown) to a position dependent upon the desired interval, after which interval the cam causes a reed to vibrate by allowing part of it to move into the magnetic field of the motor, in known manner. The interval is indicated by means of two dials 46 and 45 carried respectively on a shaft and a sleeve concentric therewith and geared to be driven in the ratio of 1:4. The low speed dial 46 has a quadrant removed (as shown) so that the high speed dial 45 is visible through a small window (Fig. 1, not shown) just above the shaft 48. The dial 45 is marked up to 60 minutes and after one revolution (clockwise) the dial 46 has moved through 90 degrees, becomes visible in the window and obscures dial 45. Dial 46 is calibrated from 1 to nearly 4 hours, as shown. Specification 897, 536 is referred to. |
