Device to trigger buzzing of alarm clock

Details Device to trigger buzzing of alarm clock Device to trigger buzzing of alarm clock

1998-04-01

1999-03-09

Roskoski, Bernard

Horology: time measuring systems or devices

Signalling means

Time condition responsive

368264, G04B 2300

Patent

active

058810293

ABSTRACT:
An alarm clock has a housing provided with a control door having a permanent magnet and an actuating rod capable of pushing a conductive elastic piece located in the housing. The conductive elastic piece is capable of actuating a magnetic sensor which is located in the housing and is composed of an electromagnet and a relay capable of altering the polarity of the electromagnet to attract the permanent magnet of the control door. The magnetic sensor is actuated by the control circuit of the alarm clock at a desired time set to buzz such that the polarity of the electromagnet is changed by the relay, and that the control door is thus repelled to remain open.

REFERENCES:
patent: 1381225 (1921-06-01), Pfeifer, Jr.
patent: 4747087 (1988-05-01), Sakuma
patent: 5050140 (1991-09-01), Aubert
patent: 5365499 (1994-11-01), Sell
patent: 5757732 (1998-05-01), Kuo

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