Horology: time measuring systems or devices – Oscillating or reciprocating means – Pendulum type
Patent
1978-07-19
1980-05-20
Jackmon, Edith S.
Horology: time measuring systems or devices
Oscillating or reciprocating means
Pendulum type
G04B 1710
Patent
active
042032822
ABSTRACT:
An electrical pendulum clock comprising a clock movement having a driven shaft and a dummy pendulum driven from the shaft independently of the timekeeping function of the clock. The pendulum comprises a torsion spring with a vertical axis of twist and a pendulum body suspended at the lower end of the torsion spring. The torsion spring has a radial projection which undergoes pendulous travel with the pendulum under the drive from the shaft of the clock movement. For this purpose a first toothed element is driven in rotation by the shaft of the clock movement and a turnable element is loosely suspended for pendulum movement on the shaft. The turnable element loosely carries a second toothed element on a shaft extending parallel to the shaft of the clock movement, the second toothed element being in mesh with the first toothed element. The second toothed element is positioned in the path of travel of the radial projection on the torsion spring for being locked with the turnable element to then undergo angular movement with the first toothed element to initiate the pendulous movement of the pendulum body via the projection and the torsion spring. After a given degree of angular movement of the turnable element, the latter is released from the radial projection and the pendulum body continues its pendulous movement while the turnable element now returns to an equilibrium position to await the return of the projection upon completion of one cycle of pendulous movement of the pendulum body.
REFERENCES:
patent: 1868941 (1932-07-01), Herschede et al.
patent: 3802181 (1974-04-01), Marquis
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