FR2576627A1 - Intrusion detector with integral door protection - Google Patents

Abstract

The device consists of a main housing 4 with a cover 6 containing the three necessary detections 10, 13, 14 and is fitted in front of the pump 3 of an existing safety lock 2 on the door 1 to be protected; the detections are to be connected to a conventional alarm box available on the market. The first detection relates to the intention of opening the cover 6 of the device in order to have access to the door lock. The second detection relates to any attempts to tear out or break open the door itself, thus bringing about the displacement of a yoke 10. The third detection relates to breaking in by cutting open the door (armoured door) with a torch by means of the detector 14. The contacts of the three detectors are retransmitted by means of an electrical cable 16 to a conventional alarm system located inside the room to be protected.

Description

The present invention relates to a device allowing
the application of intrusion protection in housing,
by detection of attempts to break in the entrance doors.

The current state of the art in this area does not allow
in particular to detect beforehand attempts to break-in of a lock by introducing keys or passes; the majo
rity of existing systems based on the application of electro-
nique is sensitive to electrical or radio interference which is not the case with the device presented.

The device according to the invention is based on three fundamental principles: - Opening detection with a key or a pass in a lock
or an existing lock on a front door.

- Detection of an attempted break-in of a front door
by tearing, unhinging or sinking.

- Detection of an attempt to pierce a door by all
thermal tools, for example a blowtorch.

These three detections are insensitive to external parasites
laughing at the absence of abnormal electronic equipment; by
against these systems are detectors and therefore must
be connected to a conventional audible alarm box or
other existing on the market.

The invention will be better understood by referring to the figures
resales figures Ia and Ib describe the mechanical assembly of the
device, Figure 2 relates to the electrical diagram in
dull of the assembly described in Figure Ia and Ib.

Figures Ia and Ib represent the mechanical assembly
in both aspects, front and side mounted on a door
(I) equipped with a lock (2) and outside, closing the
pump (3) of said lock (2).

Figures Ia and Ib show the cover system or
green (6), the general appearance of the closed lid system (6) has
all the appearance and dimensions of a classic button in
door opening brass.

 The main purpose of the device is to be mounted outside a door (I) just in front of the pump (3) of the existing safety lock (2) by fixing on the inside of the door (I) and under the lock (2) by two machine screws (9) which come through the door (I) by two holes, fix the whole of the device placed outside the door (I).

 The wiring of the wiring (I6) 4 insulated electrical wires of approximately 6 / I0 mm, from the connection terminal (I5) placed in the main housing (4) is made by a groove made in the field of door (I) until the first hinge of the door; this cable (I6) after a loosening loop necessary for the opening of the door is fixed inside the doorframe to be then connected to a conventional sound or other alarm box (I7) existing on the market and placed at the interior of the housing to be protected.

 The case cover (4) being in the closed position, the system of the three detections is on standby, without power supply, provided that the alarm box (17) is in service.

 The cover of the device (6) is hinged to the bottom of the main shoemaker (4) by a hinge (7) and held in iron by a small key lock (8) of a current model (for example suitcase fitting) and this in order to avoid any untimely manifestation of opening of said cover; in the closed position the cover (6) pushes a micro contact (13) then put in the rest position.

To have access to the pump (3) of the door safety lock (2) in order to introduce its key to operate the lock (2) and open the door, it is necessary to open the cover (6) of the device by the key of the small lock (8); therefore the micro contact (I3) is released thus producing two contacts (open or closed) which are then retransmitted to the alarm box (I7) whose timing will be set to approximately 30 seconds, thus allowing the necessary time. when opening the door and canceling the cabinet alarm (I7) by cutting off its power supply (21) that
return to service before leaving the accommodation for a
restarting the alarm, then it will be necessary to
close the cover (6) of the device using the key (8).

It will be understood that the time of 30 seconds allocated does not
not allow time for a possible burglar to
operate the safety lock (2) using false keys
or passes. Anyway, the alarm given by the microphone
contact (I3) is irretrievably saved from the start
yawning (2 or 3 m / m) of the cover (6).

The second detection concerns all attempts to ef
fraction of the door by knocking or tearing which causes strong vibrations on the door itself; these vibra
tions are recorded inside the device by a
semi-circular stirrup (IO) held in a sensitive vertical position, by two axes (55) passing through the tube through two holes
(5) placed in the center of the shoemaker (4) and held therein by
two legs welded to the rear of the boot maker on which are
also fixed the two nuts of the fixing screws (9) of
the whole system; the vibrations are likely to
move the stirrup (IO) which moves back and forth and therefore comes into contact with an adjustable screw (I2)
(allowing to vary the swinging space), This screw is fixed by thread through an insulating lug and
is electrically bound to the terminal (15) on which
the metal mass of the entire device is also connected; any contact between the caliper (IO) and this screw
is forwarded to the main alarm box (I7) with a
20 seconds advance delay for example, allows
so much so, when the owner opens the door
keep quiet to cancel the alarm on the box (I7); this
action merging of course with the opening of the
door to the wing of the key (2) of the safety lock, because
opening the door also causes displacement of
the caliper (IO).

 The third detection concerns all attempts at thermal piercing of the door (armored door for example) the action of the detector (I4) then acts, the latter also being placed in the main housing (4).

 This detector is composed of a tube (22), inside this tube is compressed a spiral spring (23) maintained in compression by pouring into the tube, sealing wax; the whole detector is placed just behind the bracket (IO) with a space of 3 or 4m / m approximately.

 Under the effect of the heat the wax melts (approximately 600), thus releasing the spring (23) which then pushes the stirrup (IO), the latter then establishes contact with the screw (I2) and causing a loop as described for the second detection.

 FIG. 2 represents the internal back-up diagram of the device comprising the connection terminals (I5), the micro-contact (I3), the screw and the bracket (IO) and its contact screw (I2) as well as the connection cable (16) and its connection to an alarm box (I7) by two closed loop inputs (I8) with regard to the three detections described in the present invention and an open loop connection (I9) also provided for this in order to alarm in the event of the housing and cover detection system being torn off (49 and (6), thus causing the connection wires to break and therefore the emission of an open loop.

 The main alarm cabinet model existing on the market is of course equipped. a switch (21) which can be placed on the alarm box itself or placed in the immediate vicinity of the interior door; on the other hand, it is recommended to install this switch so that it is controlled directly by the bolt of the door security lock; this system avoiding any omissions in (or out) of service

Claims (4)

 I) Protective device for housing entrance doors, characterized in that it comprises a main housing (4) closed with a cover (6) inside which the three necessary detections are housed: opening detection d a lock or a bolt, detection of an attempt to break in a door, detection of an attempt to pierce a door, the said housing and its detections being fixed to the outside of a door entry (I) to protect, closing the pump with a lock (2) existing security on this door and in the form and dimensions of an entry door handle.  2) Device according to claim I) characterized in that the breaking open of the cover (6) in order to have access to the security lock (2) causes a first detection by the operation of a micro contact (I3) which then establishes either a closed contact (I8) or an open contact (I9); these contacts being retransmitted by means of a connection terminal (I5) and an electrical cable (I6) to a conventional alarm system (I7), audible or other, placed in the room to be protected.  3) Device according to claim I) characterized in that any attempt to depress or tear the door (I) causes by the shocks thus produced the displacement of a stirrup (IO) articulated on the two axes (II) coming to establish contact with an adjustable screw (12-) thus causing between this insulated screw (I2) and the metallic structure of the assembly including the stirrup (IO), a closed contact (I8); this loop also being retransmitted by means of connection terminals (I5) and an electric cable (I6) to a conventional alarm system (I7)  4) Device according to claims I) and 3; characterized in that all attempts to cut the door cause the detector (I4) to operate; this is triggered under the effect of the communicated heat and comprises a spiral spring (23) permanently maintained under pressure inside a tube (22), using sealing wax, the heat effect causing the release of the spring (23), thereby pushing the pendulum (IO) coming into contact with the screw (I2) and thus causing a contact retransmitted to an alarm system (17).