FR2600802A1 - Individual alarm triggered by muscle - Google Patents

Abstract

Alarm system triggered by simply abruptly opening the hand, without suspect gestures. This can be adapted to a bracelet watch and to various uses: protection of banks, businesses, elderly persons, etc. It comprises a transmitter device and a receiver device.

Description

 The present invention relates to an individual alarm device with muscular triggering allowing by the simple abrupt opening of the hand to stiffen the mus cle of the wrist and to close a flexible electrical contact under the case of a wristwatch, and acting on a system triggering an alarm.

 the main part of this device is a bra celet watch fitted on its face, wrist side, with a flexible electrical contact. This contact is activated by muscular effort due to the sudden opening of the hand.

 On the same wristwatch, a micro transmitter sends a signal to a reception station located in the room or near the room or rooms to be monitored.

 the receiving station is equipped with an electronic assembly which makes it possible to manage the signals of several detection devices placed in the same environment.

 For various programs, it is possible to confirm the alarm - after a single signal or on the contrary after - several signals spaced by a preset time, in order to avoid inadvertent tripping.

 After validation of the signal (s) by the program, the alarm can be triggered by the police, a surveillance service, other neighboring establishments or ~ of a similar nature.

bank employees could be equipped with a wristwatch, classic in appearance, and an electronic assembly placed outside public places. At the entrance of one or more burglars, one of the employees, even forced under the threat of a weapon to raise the minutes in the air or to remain motionless, gives the alarm without the burglars' see it. The other employees, also equipped, confirm the alarm by each triggering a signal
Following this, the electronic system integrates the signals, and via a telephone or radio line alerts the police or the security service, all without burglars being able to oppose it and even know it. existence.

 the police, to avoid complications, can let criminals who are not aware of their presence come out and intercept them outside and in the absence of an audience.

 For an association of traders established in the same district or the same street, the intervention of criminals at one of them could be reported to all the other traders of the association allowing them either to bring help, or more reasonably to notify the competent services within a very short time. In addition, the simple fact of knowing the event at its beginning could allow the taking of photos or the location of criminals during departure.

 Such a system noted on the merchant's advertising could have a certain and reassuring deterrent effect for the customers.

 This device, with the more simplified reception part, can be adapted to hospitals, hospices for the elderly, in order to very quickly signal any need not allowing calls by conventional methods.

 In the event of an untimely triggering by one of the employees, it is possible to cancel its effect before the alarm is sent to the chosen department.

 The present invention will be better understood by referring to the figures; Figures la and lb representing the block diagram of the invention and Figure 2 showing the dif ferent signals.

the miniature emission system includes: (see figure la)
- an oscillator (A) with a collector emitting reaction of a transistor which includes a circuit resonating on the frequency ce of 100 MHz.

 - a tuning circuit (B) sending the high frequency signal to the transmitting antenna (C).

 The oscillator and tuning circuit assembly are mounted on ur. printed circuit made on a 2-0x3Omm te plate.

 the antenna is a 15 cm flexible wire placed in the watch strap.

 The watch push-piece ensures the sending of the control pulses from the transmitter.

 the reception system comprises (see FIG. 1b) from the reception antenna (1) a high frequency tuning circuit (2) followed by a high frequency amplification stage (3). These high frequency signals of sinusoidal shape (I) are sent to the input of a shaping stage by rectification, filtering (4) and logic gates in order to arrive at a signal of square shape for each pulse ( II).

 These signals start the clock of a counter (5) which directs through the demultiplexer (7) the triggering of the delay circuits (6 and 8).

 The number of pulses of the 4-circuit timing system (figure 2) is displayed in binary by the counter (5), the demultiplexer (7) selects the corresponding line which goes from "1" to "0", the output of the inverter (6-8) (open collector) goes from "0" to "open collector" and a capacitor charges through a resistor ensuring time delay until the voltage across its terminals reaches the switching voltage of the buffer. After this time delay the output of the buffer goes up to "1", the OR also goes up to "1" saturating a transistor which makes drive a relay. A line not selected by the demultiplexer (7) remains at "1" and short-circuits the capacitor permanently. Only the selected line gives the time delay.

 Each line is timed gradually, line 1 is timed at 3 minutes, the 2 at 1.5 minutes, the 3 at 1 minute and the 4 at 0.5 minutes (III).

 These delays are produced by 4 identical circuits, the resistance-capacitor pair of which is adapted to each delay.

Claims (4)

1 / - Individual alarm device characterized in that it includes a muscular triggering system allowing by the simple abrupt opening of the hand to stiffen the wrist muscle and to close a flexible electrical contact under the case of a wristwatch and acting on a system triggering an alarm. 2 / - Device according to claim 1 characterized in that it comprises: a transmitter system comprising an oscillator (A) followed by a tuning circuit (B) and a transmitter antenna (C), a receiver system comprising a reception antenna (1), a tuning circuit (2), a high frequency amplifier stage (3), a rectification and filtering stage (4), the clock of a counter (5), a demultiplexer (7 ) and delay circuits (6 and 8). 3 / - Device according to claims 1 and 2 characterized in that the demultiplexer (7) selects the corresponding line which goes from "1" to "O", the output of the inverter (6-8) (open collector) goes from "O" to "open collector" and a capacitor is charged through a resistor ensuring time delay until the voltage across its terminals reaches the buffer switching voltage. After this delay the output of the buffer goes up to "1", the OR also goes up to "1" saturating a transistor which leads to a relay. A line not selected by the demultiplexer (7) remains at "1" and short-circuits the capacitor permanently. Only the selected line gives the time delay. 4 / -A device according to claims 1, 2 and 3 characterized in that each line is progressively timed, line I is timed at 3 minutes, ia 2 at 1.5 minutes, the 7 at 1 minute and the 4 at 0, 5 minutes (III), these delays being produced by 4 identical circuits whose resistance-capacitor torque is adapted to each delay.