Alarm clock having on-off switch timer

An alarm clock comprising a housing seat, in which an alarm clock main body, a battery set, a control circuit board and a loudspeaker are disposed;

• wherein said housing seat is provided in a top thereof with a cut, and in one side thereof with a retaining slot having in a bottom thereof a positive piece and a negative piece separated from said positive piece at an interval, said housing seat further provided therein with a gear box having a connection portion corresponding in location to said cut of said housing seat, said connection portion having at a midsegment thereof a neck smaller in diameter than said connection portion, said gear box further having therein a retaining hook fastened pivotally therewith and provided with a retaining portion, a stopping portion, and, a hooked portion engageable with a torsion spring, said gear box still further having therein a motor, a plurality of linking gears driven by said motor, and a cam driven by said motor via said linking gears such that said cam is capable of pressing against said stopping portion of said retaining hook, said housing seat still further provided with an upper body fastened detachably therewith, said upper body provided with a pull rod opposite in location to said cut of said housing seat, said pull rod having at one end thereof a hooked portion, said pull rod provided with a sleeve fitted thereover such that said sleeve can slide along an axial direction of said pull rod, said pull rod further provided with a compression spring fitted thereover such that said compression spring is located between an inner wall of said sleeve and a periphery of said pull rod, said upper body being fastened detachably with said housing seat such that said neck of said gear box is pressed against by said sleeve and that said hooked portion of said pull rod is engaged with said retaining portion of said retaining hook, said housing seat still further provided with a side body fastened detachably therewith such that one side of said side body is fastened pivotally with said upper body, and that another side of said side body is provided with a retaining block urging said positive piece of said housing seat and contacting said negative piece of said housing seat;
• wherein said loudspeaker is activated to produce a buzzing for a predetermined duration after said cam of said gear box is actuated by said motor;
• and wherein said upper body and said side body are ejected from said housing seat at such time when said retaining hook is urged by said cam in motion to cause said retaining portion of said retaining hook to move away from said hooked portion of said pull rod.