Patent GB-190710078-A (GB)
Title: Improvements in Kinematographs or the like for Preventing Accidents through Fire.
Inventor: HOMES EMIL GOTTLIEB
Filed: 1907-04-30
Granted: 1908-03-05
Abstract: 10,078. Homes, E. G., and Gindert, J. O. April 30. Kinematographs are fitted with appliances for preventing ignition of the film and, in the case of the film tearing, for turning on the illuminating- devices in the room where the instrument is in use, and for stopping the machine. A flap 3, Fig. 1, is placed over the usual door in the place where the amount of light is greatest. The flap is mounted on a shaft 2 carrying a toothed wheel 4 gearing with a rack 6 mounted on a plate 7 which slides between guides 5. This plate is attached to one arm of a bell-crank lever 17, Fig. 2, the other arm of which is joined by a bar 16 to a rod 15 constrained to move vertically. The lower end of this rod rests on one end of a lever 14, Fig. 4, which is controlled by clock-work A. When this clock-work is started, a pin 12 on one of the wheels depresses the other end of the lever, and thus the rod 15 moves up, the rack is withdrawn from the wheel, and the flap falls. When the machine is started, the flap rises, owing to a downward motion of the rack caused by a centrifugal regulator consisting of three springs with weights 18 on them, one end being attached to a fixed sleeve on a shaft worked from the main shaft and the other to a sliding sleeve 19, which, when the speed reaches a certain value, makes contact with the lever 23, pivoted on a shaft 22 and carrying a lever 24 which is connected to the rack. The flap is only completely raised when the speed of the film is such that it is in no danger of being ignited. Beneath the flap 3 is rotary plate 26, which is kept in contact with the film or front of machine and the shaft of which is insulated from the machine. A wire 27 connects the plate to one terminal of a circuit, the other terminal of which is connected to the machine by a wire wound round a magnet 29, in front of which is an armature 9 controlling the clock-work. While the film is intact, the plate 26 is insulated from the apparatus ; should the film break, however, the circuit is completed, and by the attraction of the armature the clock-work sets in motion the various levers, and the flap 3 falls. The terminal 31 is connected to a spring contact 32 which makes contact with the sliding sleeve when the machine is not working. The wire L<1> is connected to a contact-piece 34, which, when the clock-work runs down, is connected to the terminal M ; when the clock-work is wound up no connexion is effected. The circuit L &c. is broken when the regulator comes into operation ; when the film tears, the operation of the clock-work closes the circuit through the contact 34, and also the lamp circuit L, L<1> before the sleeve 19 comes in contact with the spring contact 32. The motor circuit, which may run from L to to M in parallel with the lamps, runs from the contact 38 to the contacts 39, 40, Fig. 3, which are only connected through the plate 37 when the clock-work is wound up. If the exhibiting room is lit by incandescent gas mantles, the gas may be turned on by the action of the pivoted lever 42, of which one end rests on the lever 14 and the other end is connected to the igniting-device.