Abstract:
The present invention relates to an alarm system for a desktop clock capable of generating an audio alarm in the form of, for example, a voice message or the sound of running water at a preset wake-up or retiring time. More particularly, the invention relates to an alarm system for a desktop clock provided with an improved wake-up time indicating alarm unit on the main body, in which an hour hand alarm connecting gear wheel and a minute hand alarm connecting gear wheel are separately provided to facilitate the user&#39;s manipulation of the time setter on the casing in setting the wake-up and retiring time indication hands to a desired call time, thereby generating an audio alarm that reminds the user in a timely manner of the retiring time and a snooze time period of less than one hour, as well as the wake-up time.

Description:
The present invention relates to an alarm system for a desktop clock capable of generating an audio alarm in the form of, for example, a voice message or the sound of running water at a preset wake-up or retiring time. More particularly, the invention relates to an alarm system for a desktop clock provided with an improved wake-up time indicating alarm unit on the main body, in which an hour hand alarm connecting gear wheel and a minute hand alarm connecting gear wheel are separately provided to facilitate the user&#39;s manipulation of the time setter on the casing in setting the wake-up and retiring time indication hands to a desired call time, thereby generating an audio alarm that reminds the user in a timely manner of the retiring time and a snooze time period of less than one hour, as well as the wake-up time. 
     In the mechanism of the conventional alarm system for desktop clocks, as the user rotates and manipulates an alarm time setter, a gear wheel fixedly associated with the alarm time setter is actuated to rotate both a gear wheel connected to a wake-up time indication hand and an hour hand gear wheel in the one direction. The hour hand gear wheel in turn rotates a minute hand gear wheel to set a predetermined call time. When the preset call time is reached, the stopper of the alarm gear wheel gets out of the groove of the hour hand gear wheel to raise both the hour hand gear wheel and the minute hand gear wheel. As a result of this, the contact of the minute hand gear wheel connects with that of a power terminal connected electronically to an alarm buzzer to generate an alarm sound. The alarm system is provided with an alarm switch on the move of the timepiece, particularly, an alarm on/off selection switch or a push-bottom which is provided on the front side, backside or topside of the casing of the desktop clock. Such conventional alarm systems mostly have a single function to generate, sometimes in an untimely manner, an alarm sound at a predetermined wake-up call time as preset by the user and disturb the surrounding people with an annoying alarm sound for a long time. 
     Furthermore, the convention alarm systems sometimes miss the preset call time so that those users not in the habit of sleeping a sound sleep at a predetermined time such as students preparing an examination, children and workers may have a lack of sleeping hours and suffer from fatigue and bad health. 
     SUMMARY OF THE INVENTION 
     It is the objective of the present invention to solve the problems of the previous type and to provide a novel alarm system for a desktop clock which is provided with a retiring time indicating alarm unit and a snooze time indicating alarm unit to set a snooze period of less than one hour with modified audio alarm generating and electrical connecting structures, in contrast to the arrangement of the conventional desktop clock which only has a time indicating and alarm ringing function using the operation of an oscillator connected to a circuit board with the power on. 
     To achieve the objective of the present invention, there is provided an alarm system for a desktop clock including: a retiring time rotatable gear wheel inserted into the casing of the desktop clock; a wake-up time rotatable gear wheel inserted in the casing of the desktop to be coaxially rotated with the retiring time gear wheel; a retiring time indication hand fixedly inserted in the axial top end of the retiring time gear wheel; a first intermediate gear wheel; an hour hand alarm connecting gear wheel having the same number of toothed gears as the retiring time gear wheel, wherein the first intermediate gear wheel and the hour hand alarm connecting gear wheel are sequentially geared with the retiring time gear wheel; an hour hand gear wheel; a second intermediate gear wheel; an hour hand alarm ringing gear wheel having twice as many toothed gears as the hour hand gear wheel, wherein the second intermediate gear wheel and the hour hand alarm ringing gear wheel are sequentially geared with the hour hand gear wheel; a third intermediate gear wheel; a minute hand alarm connecting gear wheel having the same number of toothed gears as the wake-up time gear wheel, wherein the third intermediate gear wheel and the minute hand alarm connecting gear wheel are sequentially geared with the wake-up time gear wheel; a minute hand gear wheel; a fourth intermediate gear wheel; a minute hand alarm ringing gear wheel, having with the same number of toothed gears as the minute hand gear wheel, wherein the fourth intermediate gear wheel and the minute hand alarming gear wheel are sequentially geared with the minute hand gear wheel; a power interrupter provided on each backside of the wake-up time gear wheel, the hour hand alarm connecting gear wheel and the minute hand alarm connecting gear wheel; inner and outer connection rings made of separately conducting materials and provided on each backside of the wake-up time gear wheel, the hour hand alarm connecting gear wheel and the minute hand alarm connecting gear wheel; a parabolic-shaped connection terminal fixedly provided on each front side of the hour hand gear wheel, the hour hand alarm ringing gear wheel and the minute hand alarm ringing gear wheel, the latter being arranged at a position corresponding to the power interrupter; a power source, having the positive terminal thereof connected to a buzzer and the negative terminal thereof, connected to the inner connection ring and a first terminal; and a second terminal connected to the buzzer and the outer connection ring. The alarm system is configured to generate an audio alarm from the buzzer exactly at a desired call time as preset by the user. The wake-up and retiring time setting knobs are designed to remind the user of the wake-up time as well as of the retiring time and a snooze time period of less than one hour. 
    
    
     BRIEF DESCRIPTION OF THE DRAWINGS 
     FIG. 1 is a cross-sectional view showing the arrangement of a conventional desktop clock in which a retiring time gear wheel is associated with a retiring time indication hand; 
     FIG. 2 is a cross-sectional view showing the principal part in an arrangement according to the present invention; 
     FIG. 3 a  is a cross-sectional view showing the principal part of he present invention with which inner and outer connection rings are incorporated; 
     FIG. 3 b  is a cross-sectional view showing the principal part of the present invention in which the connection terminals are incorporated; 
     FIG. 4 is a cross-sectional view showing the arrangement of the present invention in which wake-up and retiring time setters are incorporated; 
     FIG. 5 is a wiring diagram showing the electrical arrangement of the alarm system according to the present invention; and 
     FIG. 6 is a front view of the alarm system in use according to the present invention. 
    
    
     DETAILED DESCRIPTION 
     Hereinafter, the present invention will be described in detail with reference to the accompanying drawings. 
     The mechanism of the performing time indication and alarm functions in a desktop clock  100  is activated as an oscillator  51  connected to a circuit board (not shown) which in turn is actuated with a power supply  50  on. In the mechanism, a retiring time rotatable gear wheel  2  is inserted in the casing  1  of the desktop clock  100  and coaxially rotated with a wake-up time gear wheel  3 , which is also rotatable and inserted into the casing  1 . A retiring time indication hand  4  is fixedly inserted in the axial top end of the retiring time gear wheel  2  positioned on the outside of the casing  1 . An intermediate gear wheel  5  and an hour hand alarm connecting gear wheel  6  are sequentially geared with the retiring time gear wheel  2  provided in the casing  1 , the hour hand alarm connecting gear wheel  6  having the same number of toothed gears as the retiring time gear wheel  2 . An intermediate gear wheel  8  and an hour hand alarm ringing gear wheel  9  are sequentially geared with the hour hand gear wheel  7 . The hour hand alarm ringing gear wheel  9  has twice as many toothed gears as the hour hand gear wheel  7 . Thus, the hour hand alarm ringing gear wheel  9  is geared with the intermediate gear wheel  8  of the hour hand gear wheel  7  is coaxially associated with the hour hand alarm connecting gear wheel  6 . The latter is geared with the intermediate gear wheel  5  of the retiring time gear wheel  2 . An intermediate gear wheel  10  and a minute hand alarm connecting gear wheel  11  are sequentially geared with the wake-up time gear wheel  3 , the minute hand alarm connecting gear wheel  11  having the same number of toothed gears as the wake-up time gear wheel  3 . An intermediate gear wheel  13  and a minute hand alarm ringing gearwheel  14  are sequentially geared with the minute hand gear wheel  12 , the minute hand alarming gear wheel  14  being provided with the same number of toothed gears as the minute hand gear wheel  12 . Thus, the minute hand alarm ringing gear wheel  14  is geared with the intermediate gear wheel  13  of the minute hand gear wheel  12  and is coaxially associated with the minute hand alarm connecting gear wheel  11  geared with the intermediate gear wheel  10  of the wake-up time gear wheel  3 . A power interrupter  15  is provided on each backside of the wake-up time gear wheel  3 , the hour hand alarm connecting gear wheel  6  and the minute hand alarm connecting gear wheel  11 . Furthermore, the inner and outer connection rings  16  and  17  made of separately conducting materials are fixedly provided on the individual backsides by means of a plurality of fixing pins  18 . A parabolic-shaped connection terminal  19  is provided on each front side of the hour hand gear wheel  7 , the hour hand alarm ringing gear wheel  9  and the minute hand alarm ringing gear wheel  14 , and arranged at a position corresponding to the power interrupter  15  of the inner and outer connection rings  16  and  17 . As a result of this the power interrupter  15  is brought in contact with the power source at a preset call time. The power source  50  has the positive terminal and is connected to a buzzer  20  and the negative terminal is connected to the inner connection ring  16  and a terminal  21 . Between the buzzer  20  and the outer connection ring  17  are connected ON/OFF switches SW 1 , SW 2  and SW 3 , and a second terminal  22  which is connected to the buzzer  20  makes contact with the outer connection ring  17 . 
     In the figures, the reference numeral  32  denotes a support board, the reference numeral  33  refers to a casing cover, the reference numeral  34  refers to an insulator (non-conductor), the reference numeral  36  is a time setter. 
     First, the principle of the operation of the conventional desktop clock will be described below prior to the description of the present invention. As an oscillator  51  connected to a circuit board (not shown) is activated with power  50  on, an oscillator rotatable gear wheel  23  actuates an intermediate gear wheel  24  and a second indication hand gear wheel  26  of which the axial top end has a second indication hand fixed therein. The second indication rotatable hand gear wheel  26  in turn actuates an intermediate gearwheel  27  and the minute hand gearwheel  12 , of which the axial top end has a minute hand  28  fixed therein. The rotable minute hand gear wheel  12  also actuates an intermediate gear wheel  29  and an hour hand gear wheel  7  of which the axial top end has an hour hand  30  fixed therein. Thus, the desktop clock indicates the current time to the user. The arrangement of the wake-up time indicating alarm unit is the same as described in the previous type. 
     The present invention is similar to the related type in the arrangement of the wake-up time indicating alarm unit, wherein a wake-up time indication hand  31  is incorporated with the wake-up time gear wheel  3 . However, the invention is provided with a retiring time indicating alarm unit and a snooze time indicating alarm unit to set a snooze period of less than one hour, in addition to the conventional alarm system with the audio alarm generating and electrical connecting structures modified, wherein the retiring time indicating alarm unit operates in a separate way from the snooze time indicating alarm unit. Now, a detailed description will be given of the operation of the present invention as follows. 
     Generally, a desired wake-up time is set within  12  hours in advance by means of the wake-up time indicating alarm unit of the present invention as in the conventional cases. As the user manipulates the wake-up time setter  52  to set a desired wake-up time, the wake-up rotatable time gear wheel  3  is actuated to rotate the wake-up time indication hand  31 , which is fixedly inserted in the axial top end of the wake-up time gear wheel  3 , thereby setting the wake-up time. At this time, the intermediate gear wheel  10  gearing the wake-up time gear wheel  3 , and the minute hand alarm connecting gearwheel  11  are separately rotating in the clockwise or counter-clockwise direction depending on the turning direction of the wake-up time setter  52 . When the preset wake-up time is reached, while the existing hour and minute hands are indicating the wake-up time, the connection terminal  19  on the front side of the hour hand gear wheel  7  is disposed at a position indicating the wake-up time and connects contact with the power interrupter  15  of the inner and outer connection rings  16  and  17  on the backside of the wake-up time gear wheel  3 . Thus, the negative terminal of the power source  50  is activated by the ON signal of the on/off switch SW 1  to generate an audio alarm from the buzzer  20  exactly at the desired wake-up time. In the meantime, the on/off switch SW 2  is ON while the on/off switch SW 3  is OFF. 
     Preferably, a desired retiring time of the retiring time indicating alarm unit is set within  24  hours in advance. As the user manipulates a retiring time setter  53  connected to the retiring time gear wheel  2  to set a desired retiring time, the rotatable retiring time gear wheel  2  is actuated by rotating the retiring time indication hand  4 , which is fixedly inserted in the axial top end of the retiring time gear wheel  2 , thereby setting the wake-up time. As such, the intermediate gear wheel  5  gearing the retiring time gear wheel  2 , and the hour hand alarm connecting gear wheel  6  are separately rotated in a clockwise or counter-clockwise direction depending on the turning direction of the retiring time setter  53 . When the preset retiring time is reached, with the existing hour and minute hands indicating the retiring time, the connection terminal  19  on the front side of the hour hand alarm ringing gear wheel  9  which has twice as many toothed gears as the hour hand gear wheel  7 , connects with the power interrupter  15  of the inner and outer connection rings  16  and  17  on the backside of the hour hand alarm connecting gear wheel  6 . Thus, the negative terminal of the power source  50  is activated by the ON signal of the on/off switch SW 2  to generate an audio alarm from the buzzer  20  exactly at the desired retiring time. In the meantime, the on/off switches SW 1  and SW 3  are both in the OFF state. 
     Furthermore, the user can set the wake-up time indication hand  31  at a desired time of less than one hour for a snooze time period when he or she wants to extend the wake-up or retiring time or exercise for a time period of less than one hour. After the preset time period elapses, the connection terminal  19  on the front side of the minute hand alarm ringing gear wheel  14  is positioned at the minute-scaled time position and connects with the power interrupter  15  of the inner and outer connection rings  16  and  17  which are provided on the backside of the minute hand alarm connecting gear wheel  11 . Then, the negative terminal of the power source  50  is activated by the ON signal of the on/off switch SW 3  to generate an audio alarm from the buzzer  20  exactly at the scheduled time. In the meantime, the on/off switches SW 1  and SW 2  are both in the OFF position. The on/off switches SW 1 , SW 2  and SW 3  are turned OFF automatically after the elapsing of the present time period depending on the length of the connection terminal  19  without any separate manual operation in a way that the connection terminal  19  gets separated from the power interrupter  15  of the inner and outer connection rings  16  and  17 . 
     Though not illustrated in the figure, another characteristic of the present invention includes a wake-up time setter  52  associated with a minute hand alarm connecting gear wheel  11  and a retiring time setter  53  associated with an hour hand alarm connecting gear wheel  6 . Such an arrangement has the following advantages: First, the user can adjust the wake-up time indication hand  31  and the retiring time indication hand  4  on the casing  1  of the desktop clock  100  to preset a desired call time. It is also possible to use the hour hand alarm connecting gear wheel  6  for gearing the retiring time gear wheel  2 , and the minute hand alarm connecting gear wheel  11  for gearing the wake-up time gear wheel  3 , without need of intermediate gear wheels  5  and  10  between the retiring time wheel  2  and the hour hand alarm connecting gear wheel  6  and between wake-up time gear wheel  3  and the minute hand alarm connecting gear wheel  11 . The numbers of toothed gears of the intermediate gear wheels  5 ,  8 ,  10  and  13  and the gear wheels are variable depending on the installation position. The gear wheels other than the retiring time gear wheel  2 , which include the wake-up time gear wheel  3 , the hour hand gear wheel  7 , the minute hand gear wheel  12  and the second indication hand gear wheel  26  which are associated with the center of the desktop clock  100 , have an adjustable gearing position. The length of the connection terminal  19  can also be adjusted to change the time interval of the audio alarm generated from the buzzer  20 . Among the on/off switches SW 1 , SW 2  and SW 3 , the switch SW 2  for turning on/off the audio alarm generated at a preset retiring time is dispensable. Furthermore, the user can select the audio alarm for indicating the retiring time as a low sound suitable for the user to fall sleep, such as a natural sound of breathing, running water, etc. 
     The present invention, the arrangement of which as described above has several advantageous effects: i.e., It generates an audio alarm exactly at a desired call time preset by the user with the wake-up and retiring time setting knobs to remind the user of the retiring time as well as the wake-up time; It enables the user to set a snooze time period of less than one hour in advance; It makes the operation mode of the alarm time indication hands distinguishable for more accurate use of the alarm function of the desktop clock; It emits a separate alarm sound in the alarm mode of the desktop clock to provide a convenient facility in using the alarm function; and it enables the user to be reminded of the exact retiring time, which forms a habit of falling asleep at the preset time naturally and of securing the necessary amount of sleeping hours.