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Publication numberUS3550109 A
Publication typeGrant
Publication dateDec 22, 1970
Filing dateJul 14, 1966
Priority dateJul 14, 1965
Publication numberUS 3550109 A, US 3550109A, US-A-3550109, US3550109 A, US3550109A
InventorsKato Tomezo
Original AssigneeKato Tomezo
Export CitationBiBTeX, EndNote, RefMan
External Links: USPTO, USPTO Assignment, Espacenet
Alarm device
US 3550109 A
Abstract  available in
Images(5)
Previous page
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Claims  available in
Description  (OCR text may contain errors)

DEC. 1970 TOMEZO KATO 3,550,109

ALARM DEVICE Filed July 14, 1966 5 Sheets-Sheet 1 Fi i i la fig 0 g l ig H IN vu/w ()R. 75/776220 Hafo BY fl n M wr -wmmwcys 0 0 0 0 a o 0 a n a .0 0

NEW tam 5 Sheets-Sheet 2 b 7 h s ALARM DEVICE TOMEZO KATO Dec. 22, 1970 Filed July 14, 1966 Dec. 22, 1970 TOMEZO KATO V ALARM DEVICE 5 Sheets-Sheet 6 Filed July L4, 1936 Dec. 22, 1970 TOMEZO KATO 3,550,109

ALARM DEVICE Filed July l4, 1966 5 Sheets-Sheet 5 g\\ m 6 CW 3.

United States Patent 3,550,109 ALARM DEVICE Tomezo Kato, 172 Mototerakoji, Sendai, Japan Filed July 14, 1966, Ser. No. 565,226 Claims priority, application Japan, July 14, 1965, 40/42,683; Dec. 30, 1965, 41/12 Int. Cl. 60% 13/06 U.S. Cl. 340-276 9 Claims ABSTRACT OF THE DISCLOSURE An alarm device including detecting means producing an alarm signal in response to presence of a trespasser, a first alarm means for giving an alarm, a second alarm means for giving an alarm, said first alarm means connected to both said detecting means and said second alarm means, switching means in said first alarm means and said second alarm means completing a circuit for giving an alarm in response to the detecting means producing an alarm signal, severing connections between either the first alarm means and the detecting means or the first alarm means and the second alarm means, or vibration of either alarm means, and disabling means including at least one series of stationary contacts and a movable contact selectively engaging one of the stationary contacts.

This invention relates to an alarm device for objects to be protected such for example as a safe, and more particularly to an alarm device adapted to raise an alarm upon removal or shift of a conductive screen, door or the like, disposed opposite an object to be protected in the vicinity thereof, or of a switch mechanism mounted on the protected object.

It is one object of this invention to provide an alarm device which is capable of raising an alarm for the presence of a trespasser without attracting his attention.

It is another object of this invention to provide an alarm device which raises an alarm in response to the variations in electrical capacity established between a conductive plate-like member and an object to be protected, both being disposed in adjacent but opposing relation.

It is still another object of this invention to provide an alarm device which is adapted to raise an alarm upon shift or removal of a switch device mounted on an ob ject to be protected.

Other objects, features and'advantages of this invention will become apparent from the following description taken in conjunction with the accompanying drawings, in which:

FIG. 1 schematically illustrates relative connections and arrangements of an alarm device according to this invention;

FIG. 2 is a front view of a safe to which the device of this invention is attached;

FIG. 3 is a front view of a screen employed in the device of this invention;

FIG. 4 is a diagram schematically illustrating another example of the alarm device of this invention;

FIG. 5 is a connection diagram showing one example of the electrical system for the operation of the device illustrated in FIG. 4; and

FIGS. 6 to 8, inclusive, are connection diagrams similar to FIG. 5 and illustrating other examples of the electrical system for use with the alarm device of this invention.

With reference to the drawings the present invention will be described in detail. In FIG. 1, reference numeral 1 indicates an object to be protected such, for example, as a safe.

As illustrated in the figure, a screen 2 is positioned adjacent the front or a door In of the safe 1 in opposing relation thereto. The front 1a of the safe 1 is made of a conductive material, namely the doors 3a and 3b are made of a conductive material and they are grounded as depicted in FIG. 2. The screen 2 has mounted thereon a conductive plate 4 on the side 2a opposed at least to the front doors 3a and 3b of the safe 1, as illustrated in FIG. 1. Further, the screen 2 has, for example, insulating wheels 5 so as not to be grounded. Reference numeral 2' indicates a supporting member for stably supporting the screen 2, which member has also insulating wheels 5. The screen 2 can be moved to a desired position at any time.

With such an arrangemen, an equivalent capacitor is constituted between the front doors 3a and 3b of the safe 1 and the conductive plate 4 of the screen 2. Then, the capacitor thus constituted is connected to an alarm device, as illustrated in FIG. 1.

In FIG. 1, reference numeral 6 identifies a device including an oscillator, amplifier, and low-frequency amplifier. Reference numeral 7 indicates a parallel tuning circuit for determining the oscillation frequency of the os cillator.

The oscillator of the device 6 has a center frequency f of, for example, kc. and is adapted such that the oscillation frequency varies with the variations in the capacity of the parallel capacitor of the parallel tuning circuit, to thereby change the output of the parallel tuning circuit, to thereby change the output of the amplifier connected to the output side of the oscillator. Connected to the output side of the amplifier is a relay, which is switched on and off to actuate, for example, an alarm bell, buzzer and/or the like. Since it will be apparent to those skilled in the art that the constructions and interconnections of the aforementioned oscillator, amplifier, relay and alarm device may be of any desired ones, no detailed description will be given for the sake of brevity. However, a description will be given later, by way of example, in connection with the contacts of the alarm device actuated by the relay and the alarm device connected thereto. Reference numeral 8 designates an alarm circuit including an alarm bell or buzzer. Further, a terminal t of the oscillator 6 is connected through a line 9 to the conductive plate 4 of the screen 2.

Thus, the capacity established between the front doors 3a and 3b of the safe 1 and the conductive plate 4 of the screen 2 is incorporated in parallel with the tuning circuit 7. Accordingly, when a trespasser approaches, moves or touches the screen 2 or he puts one part of his body between the front doors 3a and 3b of the safe 1 and the screen 2, the oscillation frequency of the oscillator is caused to vary in response to the variations in the capacity established between the safe 1 and the screen 2, whereby an alarm is given. Meanwhile, breakage of the line 9 also causes capacity variations, to thereby give awarning.

The screen 2 is so designed as to have the appearance of a usual screen, so as not to attract ones specific attention when disposed in association with the alarm device for the object to be protected.

According to the present invention, since the screen can be positioned separately from an object to be protected, for example, a safe as described above, the present invention has an advantage that the screen can be freely used for an established safe against trespass of a thief.

The foregoing has been made in connection with the case where the screen has mounted thereon a conductive plate constituting capacity with the protected object, while the same results can be obtained by attaching a conductive plate to a door located in such a position as to provide capacity between the conductive plate and an object to be protected.

FIG. 4 is a schematic diagram illustrating another example of the alarm device of this invention, which is adapted to be switched on or off to raise an alarm upon movement of the safe or opening of its door. That is, an electrical warning circuit is constituted by the provision of a contact mechanism associated with dials. This warning circuit is designed to issue a warning upon incorrect dialing, opening of the door of a safe or breakage of a line of the circuits of the alarm device during the operative condition ofthe alarm device.

In FIG. 4 the reference numeral 101 identifies generally an alarm device of this invention. The alarm device 101 is provided with, for example, three dials D D and D operable from the outside of the casting 1010 of the device 101, a set switch S for setting the alarm device in the operative condition which is preferred to be of a push-button type, a reset switch S for resetting the device, a pilot lamp L for indicating the operative condition of the device and alarm pilot lamps L to L The reference numeral 102 designates generally an object to be protected such, for example, as a safe which consists of a safe proper 102a and a door 102!) and on which alarm signal generating devices P and P each constructed as a switch are mounted in such a manner as to extend on the safe proper 102a and the door 102!) when the latter is closed. These generating devices P and P are designed to be switched on or off by shift, removal or breakage thereof, causing circuits including the generating devices to raise an alarm. In some cases, it is possible to mount the alarm signal generating devices P and P on a desired body which is located near the protected object and can readily be moved by a trespasser. Further, a similar alarm signal generating device P and coupling member U are similarly mounted on the casing 1010 of the alarm device 101, and the coupling member U is connected with the lines to I through lines to With such an arrangement, if a trespasser tries to break the casing 1010, the alarm signal generating device P is moved out of position by shock to thereby actuate the contact S or 5 Accordingly, since the relay R is actuated prior to the breakage of the casing 101e, the sub-unit 103 is actuated to raise an alarm in the same manner as that described later. By the provision of a similar alarm signal generating device on casing 1030 of the sub-unit, the alarm device 101 can be likewise actuated prior to breakage of the sub-unit.

The sub-unit can be placed at a remote location from the alarm unit 101.

The alarm signal generating device P and P mounted on the safe 102 and the alarm device 101 are interconnected through lines l to Z while the alarm unit 101 and the sub-unit 103 are also interconnected through lines to U and U indicate coupling members such, for example, as plus provided on the alarm unit 101. U

and U designate similar coupling members provided on the devices P and P mounted on the safe 102. The alarm signal generating devices P and P mounted on the safe 102 and the alarm device 101 are interconnected by respectively coupling the coupling members U and U of the device 101 and those U and U of the safe 102 through the lines 1 to U U and U are like coupling members provided on the alarm device 101 and U U and U are also coupling members mounted on the subunit 103. The alarm device 101 and the sub-unit 103 are interconnected by coupling the coupling members U U and U of the former and those U U and U of the latter through the lines to 1 in three pairs.

With such an arrangement, an alarm will not be produced through removal of the alarm signal generating devices P and P from the safe 102 and opening of the door 1021; thereof only when the dials D D and D are in the correct dial positions but in the incorrect positions an alarm will be raised by the alarm device 101 and the sub-unit 103.

Referring now to FIG. 5, the construction and opera- 4 tion of the alarm device will hereinafter be described in detail.

In FIG. 5 similar components to those in FIG. 4 are identified at the same reference numerals. The alarm signal generating devices P and P have normally open contacts S S and normally closed contacts 8 S respectively.

The alarm device 101 includes relays R to R an alarm bell B the aforementioned dials D D and D three contact mechanisms W W and W three other similar contact mechanisms W W and W and a power source E The contact mechanisms W W and W respectively consist of movable contacts w w and w associated with the shafts of the dials D D and D and three groups of twelve stationary contacts (o w g, 1a12): 2a1a 2a2: 2a12) 3a1, aaz 3a12) in cooperating relation to the movable contacts w w and w o. In a similar manner, the contact mechanisms W W and W respectively consist of movable contacts w w and w and three group of twelve stationary contacts (wlbl, o 6011 2), (wg wz z) and (01 w in cooperating relation to the movable contacts w w and 031 0. If now the dial code number of the alarm device 101 is, for example, 263, the movable contacts who and 0 of the contact mechanisms W W and W are in contact with their respective stationary contacts cu ai and w The sub-unit 103 includes relays R to R an alarm bell B and a power source B In FIG. 5 the alarm device has been set in the operative condition and the set switch S is kept closed. In this case the normally open contact r of the relay R remains open, so that the relay R is not energized and its normally closed contact i'q remains closed. Accordingly, the lamp L is lighted by the power source E through a closed circuit of the power source E the normally closed contact r of the relay R -the lamp L the power source E thus indicating that the alarm device is in its operativ condition. The other lamps L to L; are all held turned off, which will be seen from the figure.

Under such conditions, removal of the signal generating device, for example, P will lead to closing of the contact S to thereby constitute a closed circuit of the power source E the coupling member U the line l the coupling member U -the contact S the coupling member U the line l the coupling member U -the relay R the power source E thus the relay R being energized by the power source E Accordingly, normally open contacts r r and r are closed with energization of the relay R This provides a closed circuit of the power source E the contact r of the relay R -the bell B a normally closed contact r of the relay R the power source E through which the bell B is energized by the power source E to sound an alarm. At the same time, there is constituted a closed circuit of the power source E the lamp L the contact r of the relay R the power source E turning on the lamp L to indicate issuance of the alarm. The energization of the relay R further establishes a closed circuit of the power source E a normally closed contact r of the relay R -a contact r of the relay R the relay R the power source E. This causes the relay R to be self-maintaining, thereby holding the alarm bell and bell in their operative condition.

Meanwhile, removal of the other alarm signal generating device P from the safe 2 will lead to closing of the contact S and energization of the relay R by the power source E in the same manner as that in the case of closing the contact S This results in closing of normally open contacts r r and r of the relay R and provides closed circuits respectively. That is, the bell B is rung, the lamp L is lighted and a self-maintaining circuit of the relay R is constituted in the same manner as that in the case of the device P Upon removal of the alarm signal generating device P a normally closed contact is opened and also in this case the bell B is rung and the lamp L is lighted. That is, the opening of the contact 8 leads to cutting oil? a closed circuit of the power source E the coupling member U the line l -the coupling member Uf-the contact S -the coupling member Uf-the line I the coupling member U --the relay R the power source E thus making the relay R inoperative. This results in closing of its normally open contacts r r and r and provides closed circuits respectively. As a result of this, the bell B is rung through a closed circuit of the power source E the contact r of the relay R the bell B -the contact r the power source E while the lamp L is lighted through a closed circuit of the power source E the lamp L the contact r of the relay R -the power source E Upon removal of the alarm signal generator P a contact S is opened to make the relay R inoperative, in a manner similar to that just described above in the removal of the generator P and its normally open contacts r 1' and r are thereby closed. Thus, the bell B is rung through the contact 1' and the lamp L is lighted through the contact r Even if the contact 5,, or S is not closed upon removal of the alarm signal generating device P or P opening of the contact S or 8 leads to de-energization of the relay R, or R which causes the contact r or r to close. This provides a closed circuit of the power source E the contact r or r ,,the relay R or R the power source E As a result of this, the relay R or R is energized by the power source E and the same results can be obtained as those with the closing of the contact S or S Further, since the relay R is connected in parallel with a series circuit of the bell B and the normally closed contact r the relay R is also energized when the bell B rings. With energization of the relay R its normally open contact r,; is closed and consequently the coupling members U and U are electrically connected. As a result of this, there is constituted in the sub-unit 103 a closed circuit of the power source E the relay R -the coupling member U '-the line l the coupling member U tl1e contact r of the relay R the coupling member U the line l1the coupling member U 'a normally closed contact r of the relay R the power source E With this closed circuit the relay R is energized to thereby close its normally open contacts r and Consequently, there is constituted a closed circuit of the power source E -the contact r of the relay R -a normally closed contact T91 of the relay R -the alarm bell B -the power source E thus energizing the bell B to sound an alarm. In this case, the relay R is selfmaintained by a closed circuit of the power source E the relay R -the contact r -the contact r -the power source E so that the bell B is caused to go on with sounding an alarm.

Thus, protection of, for example, a safe from a trespasser can be accomplished by raising an alarm in a manner described above.

Now, a description will be given in connection with cancellation of an alarm produced as has been described in the foregoing. For this purpose, the movable contacts w w and w of the contact mechanisms W W and Wg associated with the shafts of the dials D D and D are turned into contact with the stationary contacts o 01 and w respectively. Then, the reset switch S is pressed, which results in the provision of a closed circuit of the power source E the relay RE -the contact 01 of the contact mechanism W the contact w th6 contact w of the contact mechanism W the contact w the contact 0.721 0 of the contact mechanism W -the contact tu -the contacts tu -of the contact mechanism W ,,-tl1e contact tu -the contacts a of the contact mechanism W the contact tu -the contact o of the contact mechanism W the contact -the switch S the power source E The relay R is thereby energized, which leads to opening of the normally closed contact Tq of the relay R inserted in series with the bell B to thereby stopping the ringing of the bell B At the same time, the normally closed contact l'q of the relay R is opened which is incorporated in series with the self-maintaining circuits of the relays R and R Namely, the relays R and R are made inoperative to put otf the lamps L and L However, the lamp L remains on so long as the contact S or 5 is held open.

Upon energization of the relay R its normally closed contact r is also opened to thereby cut Off the closed circuit of the power source E -the contact r ,,the lamp L -the power source E while the relay R is incorporated into a closed circuit of the power source E the relay R the switch S -the normally open contact r of the relay R7th power source E so that the relay R is caused to be self-maintaining.

Meanwhile, the relay R is energized by a closed circuit of the power source E the coupling member U., the line l -the coupling member U.,'-the relay R the coupling member U 'the line -the coupling member U.,the switch S -the contact r -the power source E The energization leads to opening of its normally closed contacts r and r This results in stopping the bell B and in cutting off the self-holding circuit of the relay R In this manner, cancellation of an alarm once produced can completely be carried out.

From the foregoing it appears that with the dials D D and D in the correct positions, opening of the safe will not lead to ringing of the bells B and B and to lighting of the lamps L and L That is, an alarm will not be raised unnecessarily.

The foregoing description has been made in connection with the operations of the alarm device resulting from removal of the alarm signal generating devices P and P from the safe 102. However, pulling out any one of the coupling member U U U and U will produce the same results as those by the opening of the normally closed contacts S or 8 and hence an alarm will be given in the manner described above. Further, cancellation of thus produced alarm is exactly the same as in the foregoing. Breakage of the lines l l l and will yield the same results.

Meanwhile, breakage of the lines I, and between the alarm device .1 01 and the sub-unit 103 will lead to opening of a closed circuit of the power source E --the coupling member U -the line l the coupling member U -the normally closed contact 1- of the relay R the coupling member U -the line l the coupling member U the relay R the power source E Hence, the relay R is deenergized and its contacts r r and r are closed. That is, there are established a closed circuit of the power source E --the contact r of the relay R the bell B the contact 7 '[h6 power source E another closed circuit of the power source E the lamp L -the contact r -the power source E and still another closed circuit of the power source E -the contact r -the relay R the power source E Thus, the lamp L is turned on and the bell B is rung and the relay R is energized. The energization of the relay R provides a closed circuit of the power source E -the contact r the bell B -the contact r -the power source E another closed circuit of the power source E the lamp L -the contact r -the power source E and still another closed circuit of the power source E the contact r -the contact r ,-the relay R the power source E Thus, the bell B is rung, the lamp L is lighted and the relay R is self-maintained to hold the bell B and the lamp L in operation. At the same time, the relay R is actuated to thereby ring the 'bell B of the sub-unit 103 as described previously. The alarm thus raised can be cancelled in the same manner as the aforementioned.

Further, it is possible to design the alarm device such that the bells and the lamps are actuated upon breakage of the alarm device 101. For this purpose, it is sufficient only to insert between the lines 1 and or between those and a switch S or S which is adapted to be closed by vibration. That is, the switches S and S equivalently perform the function of the switches S and 8 yielding the same results as those described previously.

Also in the sub-unit 103, a similar switch S is provided which is adapted to be closed by, for example, vibration. Upon closing of the switch S there is constituted a closed circuit of the power source E the relay R the switch S the contact r the power source E The relay R is energized by this closed circuit and this provides in turn a closed circuit of the power source E -a contact r of the relay R the contact r the bell B -the power source E through which the bell B is energized to sound an alarm. At the same time, there is provided another closed circuit of the power source E -the relay R its contact r -the contacts r of the relay R the contact r of the relay R the power source E thus constituting a self-holding circuit for the relay R Removal of the alarm is exactly the same as that described previously. Namely, the relay R is actuated to open its contact r cutting off the self-holding circuit of the relay R In order to change the dial code numbers, it is suiticient only to change the contact positions of the movable contacts w w and w of the contact mechanisms lb: 2b and ary When the dials have been made to assume the correct positions as described above, the self-loading circuit of the relay R is constituted. Accordingly, re-setting of the device in the operative condition requires only pressing of the switch S and turning of the dials out of the correct positions. In this manner, the device is set again in the initial condition thereof.

In this case, however, there is the possibility that the set switch S is left unpressed, even if the dials are turned out of the correct positions without fail. To avoid this, a contact mechanism W is provided which interlocks with the shaft of, for example, the dial D and is similar to the contact mechanism, for instance, W as illustrated in FIG. 6. In this case, the switch S is left out and the contact mechanism W is disposed in the position of the switch In this case, it is required to remove the connecting line of at least one of the stationary contacts of the contact mechanism W That is, if the dial code number of the dial D is 3, the connecting line of the stationary contact, for eXample, w 7 other w of the contact mechanism W must be eliminated. In such a case, at least when the dial D is in the correct position, the selfmaintaining circuit of the relay R is formed. Upon setting, the movable contact w passes the position of the contact 40 in turning the dial D out of the correct position, so that the same results as those by pressing of the switch S can be obtained. That is, the alarm device is set in the operative condition without annoying the aforementioned disadvantage resulting from the provision i of the switch S It is also possible to adapt the alarm device such that unnecessary pressing of the reset switch S will cause the bells to ring and the lamps to light. This can be accomplished by the provision of a normally open switch S which interlocks with the switch S As illustrated in FIG. 7, the switch S is inserted in parallel with the switch S of the circuit illustrated in FIG. 5. In this case, however, pressing of the switches S and S causes the bell to ring even when the dials are in the correct positions. To avoid this, the alarm device is designed in the following manner. That is, the set lamp L is not put off and no bell is rung by a first pressing of the switch S when the dials are in the incorrect positions. In this case, lighting of the lamp L indicates that the dials are in the incorrect positions. Once the dials have been made to be in the correct positions, pressing of the switches leads to putting out the lamp L without ringing any of the bells. On the other hand, when the switch is pressed twice without turning the dials in the correct positions, the bell is rung.

To accomplish this, the parallel connection of the switch S with the switch S is left out. As shown in FIG. 8, there is provided by pressing of the switch S a closed circuit of the power source E -the normally closed contact l'q of the relay Rq th switch S the relay R the power source E thus energizing the relay R The energization of the relay R provides a closed circuit of the power source E the contact r a contact 1- of the relay R a relay R the power source E so that the relay R is energized. As a result of this, there is formed a closed circuit of the power source E the contact r a contact 1- of the relay R a relay R a contact r of the relay R the power source E and hence the relay R is energized. Meanwhile, the relay R is self-held through a closed circuit of the power source E the contact I --[h6 contact r the relay R the power source E This provides a closed circuit of a terminal T connected in parallel to the switch S the contact r of the relay R the contact r of the relay R a terminal T On the other hand, the relay R is made to be self-holding through a closed circuit of the power source E --the contact r the contact r the relay R -the contact r ,,the power source E. In such a case, if the dials are not in the correct positions in a first pressing of the switches S and S the relay R7 is not energized as described above, so that the lamp L remains on, indicating that the dials are in the incorrect positions. At this time, since no self-holding circuit is provided for the relay R its contact r immediately returns to its initial position after pressing of the switches. This cuts ofif the line between the terminals T and T and the closed circuit of the relay R is not formed, so that the bell B is not rung.

Upon pressing the switches S and S after the dials have been made to assume the correct positions, the relay R is energized to open its contact 77 as described previously. Therefore, the relay R is not energized again and its contact r remains open, so that no bells ring.

If the switches S and S are pressed again with the dials in the incorrect positions after the aforementioned first pressing, the relay R is energized again because the relay R is not energized to keep its contact I'q closed. Accordingly, the line between the terminals T and T are completed through the contact r and hence a closed circuit of the relay R is formed through the terminals T and T (This is the same condition as that obtained in the case where the switches 8 and S are closed.) As a result of this, the bell is sounded.

The connections shown in FIGS. 5 to 8 may be employed as the alarm device 8 of the example shown in FIG. 1. That is, the contact S or S (S or 8 shown in FIGS. 5 to 8 is utilized as a contact of a relay connected to the output side of the amplifier in the circuit 6.

Although the present invention has been described with reference to a safe, the principles of this invention can be applied to any other desired object to be protected. Further, the alarm signal generating device may be those which function in the manner of a switch.

It will be apparent that many modifications and variations may be effected without departing from the scope of the novel concepts of this invention.

What I claim is:

I. An alarm device comprising:

detecting means having at least a normally closed switch opening in response to a trespasser disturbing an object to be protected;

a first alarm circuit having a first electric power source connected in parallel with an alarm producing means,

a first, a second and a third switch actuator, and also having a fourth switch actuator connected in parallel across said alarm producing means;

first housing means generally enclosing said first alarm circuit;

a first vibration-sensitive switch mounted on said first housing and having a normally open pair of contacts closing in response to vibration of said first housing means;

a second alarm circuit having a second electric power source connected in parallel with a second alarm producing means, a fifth switch actuator and a sixth switch actuator;

second housing means generally enclosing said second alarm circuit;

a second vibration-sensitive switch mounted on said second housing means and having a pair of normally open contacts closing in response to vibration of said second housing means;

said first alarm circuit including a first series circuit connected in series with said first switch actuator and including said normally closed detecting switch, a first lead line extending between said detecting switch and said first electric pOWer source and a second lead line extending between said detecting switch and said first actuator so that said first actuator is normally operated,

a second series circuit connected in series between said electric power source and said second switch actuator and including a normally closed switch disposed in said second housing means and opening in response to actuation of said fifth switch actuator, a third lead line extending between said last mentioned normally closed switch and said second switch actuator and a fourth lead line extending between said first electric power source and said last mentioned normally closed switch,

a first parallel circuit connected in series between said third switch actuator and said electric power source and including said normally open contacts of said first vibration-sensitive switch and a normally closed switch actuated by said first switch actuator,

a second parallel circuit connected in series between said power source and said alarm producing means and including a second normally closed switch actuated by said first switch actuator, a normally closed switch actuated by said second switch actuator and a normally open switch actuated by said third switch actuator;

said second circuit including a normally opened switch disposed in said first housing means and actuated by said fourth switch actuator and connected in series between said second power source and said sixth switch actuator,

said normally opened pair of contacts of said second vibration-sensitive switch connected in series between said second power source and said fifth switch actuator, and

a third parallel circuit connected in series between said second power source and said second alarm producing means and including two pairs of normally open contacts respectively actuated by said fifth and said sixth switch actuators,

whereby a circuit is completed between said first power source and said first alarm producing means whenever the object to be protected is disturbed in a manner to open said normally closed detecting switch, said first housing means is disturbed to close the normally open pair of contacts of said first vibration-sensitive switch, any one of said first, said second, said third or said fourth lead lines are severed, or said second housing means is disturbed in a manner to close said normally open pair of contacts of said second vibration-sensitive switch and a circuit is completed between said second power source and said second alarm producing means whenever said second housing means is disturbed in a manner to close said normally open pair of contacts of said second vibration-sensitive switch means or said fourth switch actuator is actuated, i.e. whenever a circuit is completed between said first power source and said first alarm producing means.

2. An alarm device as defined in claim 1 and further characterized by:

said detecting means comprising an oscillator having an L-C tuning circuit and a conductive member disposed in opposing relation to the object to be protected and establishing a capacitance in parallel with the capacitor of the tuning circuit of said oscillator, and means opening said normally closed detecting switch whenever the capacitance established between the object to be protected and the conductive member varies due to the presence of a trespasser.

3. An alarm device as defined in claim 1 and further characterized by:

said detecting means comprising an alarm signal generating means detachably mounted on the object to be protected and opening said normally closed detecting switch whenever said alarm signal generating means are moved.

4. An alarm device as defined in claim 1 and further characterized by:

means for opening a pair of normally closed switches respectively connected in series between said first power source and said first alarm producing means and between said second power source and said second alarm producing means and including an encoded permutation circuit having a plurality of stationary contacts,

a movable contact selectively engaging one of said stationary contacts, and

a seventh switch actuator for opening said last mentioned two pairs of normally closed contacts and connected in series between said first power source and a selected one of said stationary contacts.

5. An alarm device as defined in claim- 1 and further characterized by:

a holding circuit for said third switch actuator and including a pair of normally open holding contacts actuated by said third switch actuator and connected in parallel with said first parallel circuit; and

a holding circuit for said sixth switch actuator and including a pair of normally open holding contacts actuated by said sixth switch actuator and connected in parallel with said first parallel circuit.

6. An alarm device as defined in claim 5 and further characterized by:

circuit means for cancelling an alarm produced by said alarm producing means and for resetting said alarm circuits, said means comprising:

encoded permutation switch means having a plurality of stationary contacts and a movable contact for engaging said stationary contacts, seventh switch actuating means connected in series with a selected one of said stationary contacts and said movable contact,

a manually operated, normally open reset switch connected in series with said seventh switch actuating means,

four pairs of normally closed contacts respectively connected in series with said first alarm producing means, said second alarm producing means, said first switch actuator holding contacts and said sixth switch actuator holding contacts,

1 1 whereby whenever said movable contact engages the selected one of said stationary contacts and said reset switch is closed, said seventh switch actuator opens all said pairs of normally closed contacts to cancel the alarm and reset the alarm circuits.

7. An alarm device as defined in claim 6 and further characterized by:

a pair of normally open holding contacts for said seventh switch actuator connected in parallel with said cancelling and resetting circuit means and actuated by said seventh switch actuator.

8. An alarm device as defined in claim 7 and further characterized by:

a manually operated, normally closed set switch connected in series with said holding contacts for said seventh switch actuator.

9. An alarm device as defined in claim 7 and further characterized by:

said switch means connected in series with said seventh switch actuator and said holding contacts for said seventh switch actuator, said means comprising a plurality of stationary set contacts,

a movable set contact for engaging said stationary set contacts and being mechanically connected to said first mentioned movable contact for movement therewith,

at least one of said stationary set contacts, other 12; than one of said set contacts engaged by said movable set contacts when said movable cancelling contact engages the selected one of said stationary cancelling contacts, being disconnected from said circuit, whereby, moving said movable cancelling contact, and thus said movable set contact, out of engagement with the selected one of said stationary cancelling contacts reaks a circuit actuating said seventh switch actuator,

thereby automatically resetting said alarm circuits.

References Cited UNITED STATES PATENTS 2,874,376 2/1959 Spenard 340-276 3,133,276 5/1964 Miller et a1 340276 574,856 1/1897 Trott 340276 2,943,308 6/1960 Westphal 340-274X 3,041,592 6/1962 Schmidt 340258 3,058,092 10/1962 Johnson 340-276X 3,199,096 8/1965 Bagno 340258 THOMAS B. HABECKER, Primary Examiner D. L. TRAFTON, Assistant Examiner US. Cl. X.R. 340261, 258, 256

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Referenced by
Citing PatentFiling datePublication dateApplicantTitle
US4884061 *May 26, 1988Nov 28, 1989Axytel S.A.Capacitive apparatus to monitor the integrity of a wall
Classifications
U.S. Classification340/506, 340/562, 340/545.5, 340/581
International ClassificationG08B13/02, G08B13/26, G08B13/06, G08B13/22
Cooperative ClassificationG08B13/26, G08B13/06
European ClassificationG08B13/06, G08B13/26