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    • 10. 发明专利
    • Improvements in or relating to Electric Clocks.
    • GB191325184A
    • 1914-11-04
    • GB191325184D
    • 1913-11-04
    • NU LINES MFG COMPANY LTDCUTHBERT CHARLES CHAPMAN
    • G04C3/00
    • 25,184. Nu-Lines Manufacturing Co., and Chapman, C. C. Nov. 4. Electric clocks. - An electric clock is driven by means of a rocking beam, the oscillations of which are maintained by forces exerted by means of solenoids upon the ends of the beam in both directions of its movement. The beam 8, which is mounted on a spindle 7 pivoted on knifeedges 6, carries a looselyhanging weighted pawl 19 engaging a ratchetwheel forming part of the dial-train. A screwed rod 26, carrying an adjustable bob 27, depends from the beam and serves to regulate the oscillations, adjustable balancing - weights 25 being provided on rods 24 arranged longitudinally on the beam. Permanent magnets 11 are suspended from the ends of the beam, and form the cores of solenoids 13, 14. The current-reverser comprises an insulating-block 41 having two conducting- plates 43 embedded in its upper surface, Fig. 5. On this surface rest the ends of eight insulated contact-strips, which, arranged in two sets A, B, are pivoted on the ends of pillars 46 which are themselves pivoted at 47. Light springs 59 connect each contact-strip to a terminal 60. The block 41 is attached to a wire 34 carried by a spindle 30, Fig. 4, the upper end of the wire being arranged between tappers 37 provided on a member 35 secured to the spindle 7 of the beam. As the beam oscillates, the engagement of the tappers with the wire 34 moves the part 41 of the commutator to and fro beneath the contact-strips, which are thus connected in pairs by the plates 43 in such a way that current flows through the solenoids 13, 14. simultaneously and is reversed at each oscillation. The attraction and repulsion of the magnets 11 effected in this way maintains the movement of the beam. The points at which the current is cut off each time by the movement of the block 41 are independent of the amplitude of the oscillations, and can be determined by adjustment of the members 37, 46. Instead of the solenoids 13, 14, only one solenoid may be employed. The battery employed preferably consists of a copper and an iron plate buried in the earth.