Improvements in Electrically Operated Means or Devices for Exhibiting Advertisements, Pictures, Notices or the like.

摘要

4974. Joel, H. F. Feb. 28. No Patent granted (Sealing fee not paid). Reel and endless-web apparatus; moving and changing apparatus.-An apparatus for exhibiting advertisements, pictures, &c. has the period of rest between the cycles of operation controlled by an electro-thermostat. A motor C shown in action drives a worm-wheel F on the shaft of one of the drums of a reel-and-web apparatus, so that a pin F' urges a lever A against the action of a spring A2 and breaks the contact B. While the contact A, B is complete, a current flows through the coils J, and the heated compound bar J4 holds its head J2 away from the contact J3. When the contact A, B is broken, the compound bar cools until the contact J2, J3 is made and the motor circuit is thereby completed. The contact A, B is soon re-made, and the operation repeated as before. A clock may control a switch for cutting-off the current from motor or lamps for any desired period of time. Lamps K, K may be lit up when the lever A falls upon the contact K1. If the current through the motor gets too strong, the coil J heats up the bar until the contact J2, J5 is made, and the short-circuit produced blows the fuse E1. The thermostat may be arranged to complete the by-pass circuit to the motor on becoming sufficiently warm instead of on cooling. According to the Provisional Specification, the motor may drive through a friction clutch, and may have a brake to assist in stopping it periodically.