FR2698656A1 - Improvements to the devices for detecting the engaged position of a bolt. - Google Patents

Abstract

This is a detector of the engaged position of a bolt, comprising an electrical circuit capable of emitting an appropriate signal S which can be used for a display and / or control of another element when the bolt is in its position. engaged. This detector further comprises two code subassemblies (A, B) mounted respectively on the bolt (1) and in the keeper (2) so as to make possible a comparison of their respective codes, by a link (E) without contact and wireless, for the engaged position of the bolt and for this single position, the above electrical circuit being associated with one of these two subsets so as to emit the signal S when said comparison reveals an identity between the two codes.

Description

Improvements to the devices -to detect the engaged position of a

  The invention relates to devices intended to control access and more particularly to the locks of doors mounted generally pivoting about a vertical axis, inside a frame or frame, locks ensuring the locking of the door in closed position by moving a bolt slidably mounted in the lock located in one of the two elements constituted by the door and its frame for its introduction into

  a facing keeper carried by the other element.

  It is intended to detect the position of the bolts with respect to the strike and more particularly the position inside the strike, position which will be

  subsequently designated as the engaged position of the bolt.

  To detect this position of the bolts, it has already been proposed to actuate mechanically by the bolt or by an element integral with the latter, a switch.

electric carried by the lock.

  In this case we detect in fact the "retracted" or "extended" position of the bolt, useful information certainly but which does not allow to be sure that the bolt is

  well in position engaged in the keeper.

  This is the reason why it has been proposed, in order to detect the position of the bolts, to have an electrical switch actuated mechanically by the bolt.

carried by the keeper itself.

  But here again such a device is not safe because the switch can be actuated by a bolt replacement element fraudulently attached to this switch using an adhesive tape or any

other desirable way.

  However, it is sometimes imperative that the position of the

  bolt in relation to the strike is safely detected.

  This is for example the case when the door considered is the door of a room under high

  surveillance such as a bank, a safe room

  forts, a prison cell, etc. In such a case, in fact, knowing the position of the bolt in relation to the strike can allow a safety officer concerned to know with certainty the general state of its installation, schematized by example on a light board by small lamps of a given color for the bolts in the strikes and another color for the bolts outside the strikes. This information can thus make it possible to detect, for example in the case of a prison, that the door of one of the cells is in reality not locked even if the door is indeed in the closed position, for example if the bolt has has been sawn so that in the used position "I of the lock it is not engaged in the strike

corresponding.

  The invention makes it possible to remedy the various drawbacks indicated above by bringing to the problem of detecting the position of the bolt in the keeper a

perfectly reliable solution.

  To this end, a detector of the engaged position of the bolt according to the invention also comprises an electrical circuit suitable for emitting an appropriate signal S usable for a display and / or any other application when the bolt is in its engaged position and it is essentially characterized in that it further comprises two code sub-assemblies mounted respectively on the bolt and in the strike so as to make possible a comparison of their respective codes by a contactless and wireless connection for the engaged position of the bolt and for this single position, the above electrical circuit being associated with one of these two sub-assemblies so as to emit the signal S when said comparison reveals an identity between the two codes. In preferred embodiments, use is also made of one and / or the other of the following arrangements: one of the two sub-assemblies comprises a source of electric current, an emitter of electromagnetic waves or the like and an electronic circuit for modulating this emission according to a predetermined code, and the other sub-assembly comprises a source of electric current, a receiver mounted so

  to receive the modulated wave coming from the transmitter below

  above for the engaged position of the bolt, an electronic circuit for developing from this wave a signal representing its coded modulation and an electronic circuit for comparing the code of this modulation with a second predetermined code and for emitting the signal S when this comparison reveals an identity between the two codes, one of the two sub-assemblies comprises an electric current source, an emitter of electromagnetic waves or the like and the other sub-assembly includes an electric current source, an electronic circuit for modulating the wave from the above transmitter for the engaged position of the bolt according to a predetermined code, the first of the two sub-assemblies further comprising a receiver mounted so as to receive the wave emitted by the transmitter and modulated by the second sub-assembly, an electronic circuit for developing from this wave a signal representing its coded modulation, and an electrical circuit onique to compare the code of this modulation with a second predetermined code and to emit the signal S when this comparison reveals an identity between the two codes,

  the power supply of one of the sub-

  assemblies is ensured from a source understood by the other subset via an electromagnetic coupling between two circuit elements

  complementary understood respectively by the two sub-

  assemblies and mounted respectively on the bolt and in the strike so as to be able to be coupled together for the engaged position of the bolt, in a device according to the preceding paragraph means are provided to ensure the electromagnetic coupling between the two circuit elements only when the bolt is in its engaged position, these means comprising an electrical switch suitable for controlling the electrical connection between the source and the elements of the sub-assembly (B) with which it is associated, said switch being closed only for the position engaged with the bolt, the electromagnetic coupling between the two components is of the transformer type, the electromagnetic coupling between the two components is of an inductive type, the electromagnetic coupling between the two components is of a capacitive type, the electromagnetic coupling between the two components is of an optical type, the sub-assembly mounted on the latch has the shape of a cylinder with a diameter between 1 and 5 mm and

  length between 10 and 20 mm.

  the sub-assembly according to the preceding paragraph comprises a circuit element to supply the electronic circuits, as well as the reception of the waves emitted by the other sub-assembly, an electronic circuit capable of modifying the impedance of this element circuit according to a rhythm corresponding to the code recorded in a memory and a capacitor for

  store the electrical energy received.

  one of the two sub-assemblies comprises a source of electric current, an emitter of electromagnetic or similar waves and the other sub-assembly includes magnetic elements for modulating the wave coming from the above emitter for the position engaged of the bolt according to a predetermined code, the first of the two sub-assemblies further comprising a circuit for developing from this modulated wave a signal representing its coded modulation and an electronic circuit for comparing the code of this modulation with a second predetermined code and to transmit the signal S when this comparison reveals an identity between the

two codes.

  one of the two sub-assemblies comprises a source of electric current, an emitter of electromagnetic waves or the like and the other sub-assembly comprises a resonant circuit for interacting with the wave coming from the above emitter for the engaged position of the bolt according to a predetermined code, the first of the two sub-assemblies further comprising an electromagnetic circuit for developing from this modulated wave a signal representing its coded modulation and an electronic circuit for comparing the code of this modulation with a second predetermined code and to emit the signal S when this comparison reveals a

identity between the two codes.

  the contactless link has a range included

between 1 and 5 mm.

  The invention includes, apart from these main provisions, certain other provisions which are preferably used at the same time and which will be

  more explicitly question below.

  In what follows, we will describe some preferred embodiments of the invention with reference to the accompanying drawings, of course in a non-limiting manner. Figure 1 of this drawing shows a known embodiment of detecting the position of the bolt in

a lock.

  Figure 2, of this drawing, shows a known embodiment of detection of the engaged position of the

latch in a strike.

  Figure 3 of this drawing schematically shows a lock and its keeper equipped with a device for detecting the engaged position of the bolt, established

according to the invention.

  Figure 4 of this drawing shows a particular embodiment of the sub-assembly carried by the

bolt according to the invention.

  Figure 5 of this drawing schematically shows a particular embodiment of the worn sub-assembly

by the bolt according to the invention.

  Figure 6 shows a particular embodiment of the subassembly carried by the bolt comprising

  one or more magnetic elements according to the invention.

  Figure 7 shows another particular embodiment of the subassembly carried by the bolt comprising

  one or more resonant circuits according to the invention.

  The bolt and strike in question are designated

  by references 1 and 2 respectively.

  The bolt 1 is slidably mounted inside the lock 3 and is capable of occupying a retracted position for which its outer face is substantially aligned with the edge 4 of the door and an engaged position for which it is partially

in keeper 2.

  The bolt 1 can be actuated either manually by an action on a key or a handle, or electrically by excitation of a motor or an electromagnet. In the known solution for detecting the position of the bolt as illustrated in FIG. 1, an element 5, integral with the bolt or bolts, is capable of cooperating with a switch 6 also placed in the lock 3, so that in extreme exit position of the bolts

switch 6 is closed.

  In the known solution for detecting the engaged position of the bolt as illustrated in FIG. 2, the bolt 1 acts in its engaged position on a switch 6. In these two solutions the problem posed is not

genuinely resolved.

  Indeed, in the case of Figure 1, the bolt can be in the "out" position without being in the strike plate whereas, in the case of Figure 2, it suffices to press the switch 6 to simulate the position engaged the bolt in the strike, even if the lock is not opposite the

spoils.

  Figure 3 helps to understand the invention.

  There are also mounted respectively on the bolt 1 and on the strike 2 two electronic sub-assemblies coded A and B. The first sub-assembly A comprises an electric current source 14, a directional transmitter of very short range, of electromagnetic or similar waves E, an electronic circuit 16 preferably connected to a memory 17 and suitable for modulating the waves E according to a

first predetermined CI code.

  The second sub-assembly B comprises an electric current source 18, a receiver 19 of electromagnetic waves or the like mounted so as to receive the waves E for the engaged position of the bolt 1 and only for this position, an electronic circuit 20 to develop from these received waves a signal representing its coded modulation, a circuit 21, preferably connected to a memory 22, to compare the code Cl of this modulation with a second predetermined code C 2 and to send a signal S when this comparison reveals an identity

between the two codes.

  The emission of this signal S means that the bolt 1 is

found in its engaged position.

  It is operated in any desirable manner, in particular by lighting an indicator light 23 which is on a

desk 24 arranged at a distance.

  The operation of the assembly is as follows as long as the transmitter 15 is not just opposite and at a very short distance from the receiver 19, preferably at a distance of between 1 mm and 5 mm, the latter does not receive the waves E emitted by the first, so that no comparison of codes can be carried out at the level of the circuit 21 and that no signal S can be

issued by the latter.

  On the contrary, when the bolt 1 is in its engaged position, the coded waves E transmitted by the transmitter 15 are received by the receiver 19 so that the comparison of the two codes Cl and C 2 corresponding respectively to the two subsets A and B can be

performed by circuit 21.

  If these codes are not identical, no signal S

is not emitted by said circuit 21.

  If on the contrary the comparison of the two codes reveals an identity, the signal S is emitted, which results for example by the lighting of the indicator 23 on the

desk 24.

  It should be noted that the emission of the signal S is produced only if the comparison of the codes explained above is carried out and that if the two codes

  compared CI and C 2 are identical.

  As it may be practically impossible to know the codes and to reproduce a transmission of coded signals of the type of the signals E, the signal S can only be transmitted if the bolt 1 is truly in its

engaged position.

  This perfect security is the main

advantage of the present invention.

  As regards the electrical supply of the sub-assembly A mounted on the bolt, it is of course possible to use for this purpose a supply line 27 and

  a source of electric current 28.

  But we prefer to adopt one of the following autonomous formulas, which do not require the presence of any permanent electrical source in the bolt or in the lock, nor of any electrical connection of the style

mobile connection.

  To this end, the source of electrical energy 14 is produced by an electromagnetic coupling shown diagrammatically by the letter E 'between two circuit elements 29 and 30 comprised respectively by the two subassemblies A and B, the second element 30 being connected to an appropriate source 31. This coupling E 'is only carried out when the bolt is

found in its engaged position.

  It can be obtained in many different ways, this coupling being able to be carried out in the manner of transformers or be of an inductive, capacitive type

or optical.

  It can also be achieved through

  electromagnetic waves like the E waves

  above, using an appropriate transmitter and receiver. The source 31, which is in particular a source of electric current at medium frequency (50 Hz to 10 K Hz) in the case of a transformer or at high frequency (100 to 150 K Hz) in the case of an inductive coupling, can itself be supplied, through an appropriate conversion circuit (not shown), from the source 18, which can be constituted by a simple battery or by the network. To save said source 18, we use

  advantageously in addition to the following provision.

  The source 31, the receiver 19 and the circuits 20, 21 and 22, are only supplied when the bolt 1 is in its engaged position, these elements being themselves connected to the source 18 by means of a switch. 32 whose closure is conditioned by the

  setting the bolt 1 in its engaged position.

  The actuation of this switch 32 is advantageously controlled in one of the ways described in the introduction to this specification with reference to

prior art.

  In advantageous embodiments, the two subsets A and B are incorporated respectively in

the bolt 1 and in the strike 2.

  In this case, the sub-assembly A can advantageously be produced inside a cylinder 33 and be of diameter between 1 and 5 mm and of length between 10 and 20 mm, as shown in the

Figure 4.

  This subset can then be constituted as

shown in Figure 5.

  In this case, the supply is obtained thanks to a coupling E 'which is done by the same channel as the emission E. The circuit element 30, here a coil, emits a wave there borrowing the coupling E', wave which is detected by

  the circuit element 29, here also a coil.

  The voltage collected across the circuit element 29 is rectified by a diode 34 used to charge a capacitor 35. The DC voltage U thus obtained can be

  regulated by a circuit 36 such as a Zenner diode.

  This voltage U can thus supply the transmitter 15 constituted here by the circuit 16 and by the element of

  circuit 29, when the bolt is engaged in the strike.

  Thus and in a manner known per se, for example by referring to French patent applications NO 86 16393 and 86 16583, this same circuit element 29 can be used to transmit the code Cl by means of an emission E, received by the circuit element 30, which then also plays the

  role of receiver of electromagnetic waves.

  For this, the electronic circuit 16 is used to short-circuit the circuit element 29 according to a rhythm corresponding to the code recorded in a memory 17 and a capacitor 35 to store the electrical energy received during the periods when the element

  circuit 29 is not short-circuited.

  In this case, there is the set of circuits 7 which performs the functions of reception and modulation of the waves emitted by the sub-assembly B. FIG. 6 represents a variant in which one of the sub-assemblies comprises a current source electric 31, a circuit element 30, playing the role of emitter of electromagnetic or similar waves and the other sub-assembly comprises one or more magnetic elements 37, such as to modulate, in a manner known per se, the wave from the above transmitter for the engaged position of the bolt according to a predetermined code, the first of the two sub-assemblies further comprising a circuit 20 for developing from this modulated wave a signal representing its coded modulation and an electronic circuit 21 to compare the code of this modulation with a second predetermined code and to transmit the signal S when this comparison reveals an identity between the two codes. FIG. 7 represents another variant in which one of the two sub-assemblies comprises an electric current source 31, a circuit element 30 playing the role of emitter of electromagnetic waves or the like and the other sub-assembly comprises a resonant circuit 38 capable of interacting with the wave coming from the above transmitter for the engaged position of the bolt according to a predetermined code, for example the frequency of

  resonance of circuit 38, the first of the two sub-

  assemblies further comprising a circuit 20 for developing from this wave a signal representing its coded modulation, for example its frequency, and an electronic circuit 21 for comparing the code of this modulation with a second predetermined code and for transmitting the signal S when this comparison reveals an identity between

two codes.

  The resonant circuit 38 can for example be produced by mounting an inductance 39 and a capacitor 40 in parallel. The resonance frequency of this circuit, determined by the values chosen for these components,

constitutes the coding in question.

  This coding can advantageously be made more complex by arranging several resonant circuits 38 a, 38 b, etc., of frequency of different respective resonances, in or on the second subset The coding is then constituted by the determination of the various resonant frequencies of each of these circuits 38 a, 38 b, etc. Then whatever and whatever the embodiment adopted, there is finally a set of detection of the engaged position of the bolt, the

  constitution, operation and benefits -

  especially that of an almost absolute security result

enough of the above.

  As goes without saying and as it follows, already from the above, the invention is in no way limited to those of its modes of applications and embodiments which have been more especially envisaged, it embraces them, on the contrary , all the variants, in particular: those where the coded waves would be light waves, those where at least some of the complementary elements described as being carried respectively by the bolt and by the keeper in the above description would on the contrary be carried respectively by the strike and by the bolt, those where the door would be sliding instead

to be pivotally mounted, -

  those where the door would comprise several bolts actuated by the same mechanism or different mechanisms, each bolt then carrying subsets Al, A 2, etc., those where the signal S would be exploited automatically to control not only a display but also the command of another element, for example the lock of another door within the framework of a coordinated management of the movement of several doors, those where said display would be of a different type

  than bright, for example of a sound type.

Claims (12)

  1 Detector of the engaged position of the bolt, comprising an electrical circuit suitable for emitting an appropriate signal S usable for a display and / or any other application when the bolt is in its engaged position, characterized in that it further comprises two sub-assemblies (A, B) with code mounted respectively on the bolt (1) and in the strike (2) so as to make possible a comparison of their respective codes by a connection (E) without contact and without wire for the engaged position of the bolt and for this single position, the above electrical circuit being associated with one of these two sub-assemblies so as to emit the signal S when said   comparison reveals an identity between the two codes.   2 detector according to claim 1, characterized in that one of the two sub-assemblies (A) comprises an electric current source (14), an emitter (15) of electromagnetic waves (E) or the like and an electronic circuit (16) to modulate this emission according to a predetermined code (Cl), and in that the other sub-assembly (B) comprises a source of electric current (18), a receiver (19) mounted so as to receive the modulated wave (E) coming from the above transmitter for the engaged position of the bolt (1), an electronic circuit (20) for developing from this wave a signal representing its coded modulation and an electronic circuit (21) for compare the code (Cl) of this modulation with a second predetermined code (C 2) and to emit the signal S when this comparison reveals an identity between the two codes. 3 detector according to claim 1, characterized in that one of the two sub-assemblies (B) comprises a source of electric current (18), a transmitter (30) of electromagnetic waves (El) or the like and the other sub-assembly (A) comprises an electric current source (14), an electronic circuit for modulating the wave coming from the above transmitter for the engaged position of the bolt according to a predetermined code (Cl), the first of the two sub-assemblies further comprising a receiver mounted so as to receive the wave emitted by the transmitter and modulated by the second sub-assembly, an electronic circuit (20) for developing from this wave a signal representing its coded modulation, and an electronic circuit (21) for comparing the code of this modulation with a second predetermined code (C 2) and for transmitting the signal S when this comparison reveals a identity between the two codes.   4 Detector according to claim 1, characterized   in that the power supply to one of the sub-   assemblies (A) is ensured from a source understood by the other sub-assembly (B) by means of an electromagnetic coupling (El) between two elements of complementary circuits (29, 30) included respectively by the two sub-assemblies and mounted respectively on the bolt (1) and in the strike (2) so that it can be   coupled together for the engaged position of the bolt.   Detector according to claim 4, characterized in that means are provided for ensuring the electromagnetic coupling between the two circuit elements (29, 30) only when the bolt (1) is in its engaged position, these means comprising an electric switch (32) suitable for controlling the electrical connection between the source (18) and the elements of the sub-assembly (B) with which it is associated, said switch (32)   being closed only for the engaged position of the bolt.   6 detector according to claim 5 characterized in that the electromagnetic coupling (El) between the two   components is transformer type.   7 detector according to claim 5, characterized in that the electromagnetic coupling (E ') between the   two components is of an inductive type.   8 detector according to claim 5, characterized in that the electromagnetic coupling (E ') between the   two components is of a capacitive type.   9 detector according to claim 5, characterized in that the electromagnetic coupling (E ') between the   two components is of an optical type.   10 detector according to claim 4, characterized in that the subassembly (A) mounted on the bolt has the shape of a cylinder with a diameter between 1 and 5 mm and   between 10 and 20 mm in length.   11 Detector according to claim 10, characterized in that the sub-assembly (A) comprises a circuit element (29) for supplying the electronic circuits, as well as receiving the waves (E ') emitted by the other sub-assembly (B), an electronic circuit (16) capable of modifying the impedance of this circuit element according to a rhythm corresponding to the code recorded in a memory (17) and a capacitor (35)   to store the electrical energy received.   12 Detector according to claim 1, characterized in that one of the two sub-assemblies (B) comprises an electric current source (31), a circuit element (30) playing the role of emitter of electromagnetic waves or analogues and the other subset includes magnetic elements (37) for modulating the wave (E ') coming from the above transmitter for the engaged position of the bolt according to a predetermined code, the first of the two subsets further comprising a circuit (20) for developing from this modulated wave (E) a signal representing its coded modulation and an electronic circuit (21) for comparing the code of this modulation with a second predetermined code and for transmitting the signal S when this comparison reveals an identity between the two codes.   13 Detector according to claim 1, characterized in that one of the two sub-assemblies (B) comprises an electric current source (31), a circuit element (30) playing the role of emitter of electromagnetic waves or analogues and the other sub-assembly (A) comprises a resonant circuit (38) for interacting with the wave (E ') coming from the above transmitter for the engaged position of the bolt according to a predetermined code, the first of two sub-assemblies (B) further comprising an electromagnetic circuit (20) for developing from this modulated wave a signal representing its coded modulation and an electronic circuit (21) for comparing the code of this modulation with a second predetermined code and to transmit the signal S when this comparison reveals a identity between the two codes.   14 Detector according to claim 1, characterized in that the contactless connection has a range included between 1 and 5 mm.