Electric power supply device for hand with load

Details Electric power supply device for hand with load Electric power supply device for hand with load

1989-12-29

1991-06-18

Roskoski, Bernard

Horology: time measuring systems or devices

Displays or display device details

Dial or hand

368204, G04B 1902

Patent

active

050254294

ABSTRACT:
A timepiece has rotatable hour, minute and second hands each carrying an energizeable element. Electric power is supplied to the elements carried by the hour and minute hands through sliding contacts and is supplied to the element carried by the second hand through electromagnetically coupled coils. The drive torque applied to the hour and minute hands is greater than that applied to the second hand and easily overcomes the frictional drag associated with the sliding contacts. The lower drive torque applied to the second hand may not be sufficient to overcome the frictional drag associated with sliding contacts and to avoid this problem, electromagnetically coupled coils instead of sliding contacts are used to supply electric power to the element carried by the second hand.

REFERENCES:
patent: 347528 (1886-08-01), Speer

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