Long period pendulum apparatus

Details Long period pendulum apparatus Long period pendulum apparatus

1997-03-24

1998-10-13

Miska, Vit W.

Horology: time measuring systems or devices

Chronological

With mechanical or electromechanical driven display

368134, 368165, 368179, G04B 1900, G04B 1500, G04B 1702

Patent

active

058222774

ABSTRACT:
A pendulum stem (16) not more than 4 inches in length has one end portion swingably connected to a pivot arrangement (18) and a concentrated mass (22) slidably located on the other end portion. Permanent magnets (56,58) secured to the mass (22) move past a pair of wire coils (60,62) during swinging movement of the stem and mass to induce a signal in the one coil (60). The signal actuates a circuit (66) to form a pulse that is applied to the other coil (62) at an appropriate later time to create a magnetic pulse driving the mass (22) and stem (16) along its swing path. The described pendulum drive applied to a miniature clock provides a slow-swinging pendulum having a period closely approximating that of a grandfather clock many feet in height.

REFERENCES:
patent: 4121416 (1978-10-01), Niemczyk
patent: 4196579 (1980-04-01), Schaefer
patent: 4378166 (1983-03-01), Itami et al.
patent: 4712925 (1987-12-01), Beebe
patent: 4723232 (1988-02-01), Beebe
patent: 4723233 (1988-02-01), Beebe

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