# US 5,708,629 A · Structure of alarm clock

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- Number: US 5,708,629 A
- Document ID: US5708629A
- Status: Granted
- Kind: A
- Application number: 08/703,373
- Filed: 1996-08-26
- Granted: 1998-01-13
- Earliest claimed: 1996-08-26
- Inventors: Yen Hung-Hsu
- Web page: https://patentgrep.com/patent/US5708629A

## CPC

- G04C 21/00: Producing acoustic time signals by electrical means
- G04B 23/03: Alarm signal stop arrangements
- G04C 3/001: {Electromechanical switches for setting or display}
- G04C: ELECTROMECHANICAL CLOCKS OR WATCHES
- G04B: MECHANICALLY-DRIVEN CLOCKS OR WATCHES; MECHANICAL PARTS OF CLOCKS OR WATCHES IN GENERAL; TIME PIECES USING THE POSITION OF THE SUN, MOON OR STARS (spring- or weight-driven mechanisms in general F03G; electromechanical clocks or watches G04C; electromechanical clocks with attached or built-in means operating any device at pre-selected times or after predetermined time intervals G04C23/00; clocks or watches with stop devices G04F7/08)

## Abstract

An alarm clock including clock having a control circuit with a solenoid switch, and a rack having an upright post with a magnet, wherein when the alarm circuit of the clock is ringing, the battery lid and the alarm button of the clock are locked if the clock is not put in the rack; when the lock is put in the rack as the alarm circuit of the clock is ringing, a solenoid switch is induced by a magnet in the rack to unlock the battery lid and the alarm button, for permitting the user to turn off the alarm.

## Claims

### Claim 1

An alarm clock comprising a housing, a clock module and a control circuit mounted inside said housing, and a rack adapted for receiving said clock, said control circuit comprising a solenoid switch, said clock module comprising an alarm circuit, said housing comprising a casing and a back cover covered on said casing, said casing comprising a battery case, which holds a battery, which is electrically connected to said clock module and said clock control circuit, an electromagnetic valve holder suspending above said battery case, a peg spaced between said electromagnetic valve holder and said battery case, an electromagnetic valve mounted in said electromagnetic valve holder, a hook turned about said peg and having a fixed end pivoted to said electromagnetic valve and a hooked free end, and a bottom hole, said back cover comprising a back opening, a battery lid covered on said back opening and having a locating loop at an inner side, a bottom hole matched with the bottom hole of said casing, said rack comprising an upright back wall having a hang hole for hanging, a horizontal bottom wall perpendicularly extending from said upright back wall at the bottom, two upright side walls bilaterally connected between said upright back wall and said horizontal bottom wall, and an upright post raised from said horizontal bottom wall at the center, and a magnet fixedly mounted on said upright post at the top, wherein when a set alarm time comes and said housing is disconnected from said rack, the alarm circuit of said clock module is driven by said control circuit to alarm, and said electromagnetic valve is simultaneously driven by said control circuit to turn said hook, causing said hook to hook up the locating loop of said battery lid; when said housing is put in said rack by inserting the upright post of said rack into the bottom hole of said casing and the bottom hole of said back cover during the ringing of said clock module, said solenoid switch of said control circuit is induced to turn off the alarm circuit of said clock module, and to cut off power supply from said electromagnetic valve, causing said hook to be released from the locating loop of said battery lid.

### Claim 2 (depends on 1)

The alarm clock as claimed in claim 1 wherein said upright post of said rack has a polygonal cross section fitting the hole formed of the bottom hole of said casing and the bottom hole of said back cover.

### Claim 3 (depends on 1)

The alarm clock as claimed in claim 1 wherein said upright post of said rack has a triangular cross section fitting the hole formed of the bottom hole of said casing and the bottom hole of said back cover.

### Claim 4 (depends on 1)

The alarm clock as claimed in claim 1 wherein said upright post of said rack has a star-like cross section fitting the hole formed of the bottom hole of said casing and the bottom hole of said back cover.

### Claim 5 (depends on 1)

The alarm clock as claimed in claim 1 wherein said clock module has an alarm button at a top side thereof projecting out of a top hole in said housing, and adapted for stopping the said alarm circuit from alarming.