FR2659379A1 - Electric lock with pivoting lock bolt mounted on a door capable of being opened in the event of panic despite a thrust on the door - Google Patents

Abstract

Electric locking device allowing the emergency exits to be barred during the day and operated remotely, characterised by the fact that the lock bolt pivoting about a spindle is rotationally driven by an intermediate piece, itself set in motion upon closure by a motorised worm and, upon opening, by springs which were tensioned during the closure operation. The lock bolt is held in the closed position by an electromagnet compensating for the effect of the springs whilst the thrust possibly exerted on the lock bolt is compensated for by friction; it will be sufficient to cut off the electrical supply of the electromagnet in order to cause the lock to open automatically under the effect of the springs. Indeed, upon arrival in the advanced position, the intermediate piece actuates an end-of-travel switch which brings about the return of the nut of the worm to the rearward position.

Description

The present invention relates to improvements to an electrically controlled lock as described in particular in patent application N 89 13967 filed on 25.10.1989 also in the name of the present applicant.

In this patent application, an electrical locking device has been described, more particularly intended for emergency exits from premises accommodating the public, enabling them to be operated remotely while ensuring general unlocking, without any energy supply, in the event of danger.

The pin of this lock consists of a piece in the shape of a trunk: a cone to + facilitate its opening in the event of pressure on the door.

 However, the regulations being drawn up in France provide that the lock must be able to open even if a thrust of 1000 Newton is applied to the door.

Under this pressure, a bolt falling out by sliding in the strike will be systematically blocked.

The object of the present invention is to modify the bolt described in the initial patent application N 89 13967 to replace it with a pivoting bolt which will be erased under the effect of the thrust applied to the door.

As in document N 89 13967, the displacement of the bolt in the closing direction is caused by the displacement of a nut itself entai born by an endless screw rotated by an electric motor, nut which is not not secured to the intermediate piece.

The worm runs freely inside a hollow intermediate piece which slides itself inside an electromagnet.

On this intermediate clamp, there is an iron disc do on the side of the drive nut when closing.

The improvement brought by the present invention to the previous system resides in the fact that instead of driving a bolt in linear displacement, the intermediate piece will cause the rotation of an articulated bolt author of an axis offset with respect to the linear axis of movement of the intermediate piece.

For this, the intermediate piece is provided in its front part, with a hinged link, on the one hand, on the a fork fixed to one end of this intermediate piece and, on the other hand, on the pin itself .

In addition, the compression spring of the patent application
N 89 13967 is replaced by 2 tension springs connecting the axis of rotation of the link to the rear of the chassis.

Figure 1 shows a plan view of the lock, in the "open" position, cover removed. Figure 2 shows a sectional elevation view of the same lock, in the "closed" position.

The lock consists of a folded sheet frame with 2 support faces.

A direct current electric motor M is fixed by a flange to the rear support face and its axis passes through this support face.

The endless life in V steel is integral with the motor axis and is rotated by it.

The endless life V drives in translation the brouze nut E whose rotation is prohibited by any ad hoc means, for example by a headless life moving linearly in an appropriate groove made in the printed circuit placed at the bottom of the chassis.

The nut E includes a stop intended to actuate the limit switch I2 when it returns to the rear position.

The front bearing face has a hole serving as a bearing for the intermediate piece.

The latter consists of a tube made of non-magnetic material, guided through the hole of corresponding diameter which serves as a bearing in the front support face.

At the front part of the bolt located beyond the front bearing face, there is a fork on which the axis A3 rests, around which the link B is also articulated.

In addition, the link B is articulated on the p;
Pe around the axis A2.

Finally, the bolt Pe pivots around the fixed axis A1, moreover on the sides of the frame of the lock.

The worm screw V turns freely inside the intermediate piece P.

The springs Ra and Rb, connect the axis AN to the rear of the frame of the lock.

At rest, the springs Ra and Rb cause the intermediate part P to return to the rear position, thus ensuring the withdrawal of the bolt inside the frame of the lock, then its maintenance in the open position.

In addition, an annular electromagnet A, placed on the front support ace and fixed to it on the side of the worm, is crossed by the intermediate piece P.

At the end of this piece P, next to the drive nut E, is a soft iron disc D, integral with the piece P, intended to ensure the magnetic continuity of the electromagnet A when the bolt is in the closed position, thereby ensuring that it is held in this position as long as the electrical supply to the electromagnet is ensured.

The rotation of the disk D is prohibited by any ad hoc means, for example by a headless screw moving in an appropriate groove made in the printed circuit placed at the bottom of the frame of the lock.

Finally, on the disc D, there is a stop intended to actuate, in the direction of 1 opening, the limit switch I1,
The 2 limit switches Il and I2, all the electronic components intended to ensure the functioning of the system as well as the connection terminals, are placed on the same printed circuit located in the bottom of the frame of the lock between the face of rear support and the front support face.

Figure 3 shows the electrical diagram of the device.

The operation is as follows:
In the absence of electric current, the drive nut E is in the rear position and the soft iron disc D of the intermediate piece P rests on it by 1 effect of the springs Ra and Rb.

The link B of the intermediate piece P is in the rear position and the pin PE is in the retracted position thus almost completely obstructing the hole in the cover through which it will come out.

When the electric current is established on the electric circuit of the lock, the relay Re goes up, causing the rotation of the electric DC motor M in a direction such that it causes 1 7 advancement of the nut E in the closing direction of the lock.

The nut E drives the intermediate piece P in translation until the soft iron disc D comes into contact with the annular electromagnet A. Meanwhile, the springs Ra and
Rb were bandaged.

 On its arrival on the electro-aiamnt A, the soft iron disc D actuates the limit switch I1 which, by cutting the supply of the coil of the relay Re, causes the latter to drop causing, under the effect of its 2 contacts reversers, the reversal of the direction of rotation of the motor M and, consequently, the backward movement of the nut E until it itself actuates the switch for + in stroke I2 thus causing the stop motor M.

However, the intermediate piece P has remained in the advanced position since the soft iron disc D has been retained by the electromagnet A, which is supplied upstream of the coil of the relay Re and which, therefore, remains effective, even if this relay falls.

In its forward movement, the intermediate piece P caused the rotation of the bolt Pe around the axis A1 by means of the link B articulated on the one hand on the pin Pe around the axis A2 and of on the other hand on the fork of the intermediate part P around the axis A3.

The pBne Pe thus leaves the cover of the lock.

The axis of rotation A1 of the bolt Pe is integral with the frame of the lock.

The movement of the axis of rotation AN of the link B on the intermediate piece P is guided by 2 slides G secured to the frame of the lock.

These slides will be used to support the thrust forces collected by the bolt Pe to transmit them to the frame via the link B.

The angle made by the link B with the direction of the slides G, parallel to the direction of the bottom of the bolt of the bolt, is chosen so that the forces transmitted by the pne Pe to the slides e of the frame are almost completely compensated by the friction of the axis A3 on the slides G. In fact, the tangent of this angle must be barely greater than the coefficients of relative friction of the materials which constitute on the one hand the axis A3 and on the other hand the slides G .

Thus, the electromagnet A only has to compensate for the force of the springs Ra and Rb to which is added the residual force of thrust not compensated by the friction of the axis A3 on the slides G.

To cause the lock to open, it is then sufficient to cut off the electrical supply to the electromagnet A.

The intermediate part P is then released and the springs
Ra and Rb cause its recoil until the piece in + er soft D comes into abutment on the nut E.

In the event of a push on the door, therefore on the bolt Pe, the effect of the springs Ra and Rb is accentuated by the residual force not compensated by the friction of the axis A3 on the slides G.

As the power supply to the lock is cut off, the relay Re remains at rest.

Under the effect of the rod B, the pe Pe retracts by turning around its axis A1 and 5Y thus clears inside the cover of the lock.

When we want to close the lock, it will suffice to restore its electrical supply, the relay Re will mount supplying the motor M through the diode Di which short-circuits the switch 12 in the direction of the current which corresponds to the direction of rotation causing the closure.

The push button with opening Bp, placed on the cover of the lock, allows its local opening.

This push button can be actuated by a "panic" bar fixed inside the door or by any other system.

I1 can also be deported outside the door, for example, in a broken glass safety box.

A terminal of the push button Bp is out to allow the remote control to be put into service or out of service.

A magnetic contact C, fixed to the cover of the lock and whose magnet is fixed to the strike, prevents closing of the lock
If the door is open and causes it to close automatically when the door closes if the lock is powered.

An electronic time delay performed with the NPN TR1 type transistor, the resistors R1, R2, R and the capacitor
Co, causes the relay Re to fall if, after a few seconds, the lock has not fully closed.

The motor M then starts in the opposite direction and the bolt assembly Pe, link B, intermediate part P and nut E returns to its initial opening position.

To carry out another closing attempt, it will first be necessary to cut off the power supply to the lock for the time necessary for the capacitor Co to discharge, then to re-supply the lock.

Finally, the transistor Tr2 and the resistor R4 make it possible to collect on the terminal Bs a signal indicating that the latch is properly closed by causing the indicator Vr to be put into service.

Claims (6)

1) Device for electrically locking the doors constituting emergency exits capable of being opened, in the event of a panic, despite a push on the door, characterized in that it comprises a bolt Pe pivoting about an axis A1 fixed to the molding of the bolt and going in rotation by a link B itself articulated around an axis A2 on a pin PE and, around an axis A3 on an intermediate piece P, this intermediate piece P being itself driven in linear displacement, at closing, by a nut E, free relative to the intermediate part P and, at opening, by springs Ra and Rb bandaged during the closing movement, while the nut E is set in motion by a screw endless V rotated by an electric DC motor M, the bolt Pe being held in the closed position by the fact that the intermediate piece P is blocked, in the advanced position, by the action of an annular electromagnet A which it crosses, which electromagnet sticks a soft iron disc D, integral with the part P and in that by advancing, the disc D actuates a limit switch I1 thus cutting the supply of the coil of a relay Re causing its fall, which causes the starting, in the opposite direction of the motor M and, consequently, of the nut E which moves until it actuates a limit switch 12 which cuts the power supply to the motor M, So that, to cause the lock to open, it will suffice to cut off the power supply to electromagnet A. 2) Device according to claim 1 characterized in that the tangent of the angle made by the direction of the rod B with the direction of the slides e is very slightly greater than the relative coefficient of friction of the materials: which constitute one by the axis AS of the link B and on the other hand 1 the slides G.  3 Device according to claim 1 characterized in that an electronic timer constituted by a NPN TR1 type transistor, a capacitor Co and 3 resistors R1, R2 and R3 causes the electrical supply of the relay coil to be automatically cut off Re If, at the end of the time to which it corresponds, the pBne Pe has not yet reached its extreme closed position, which is detected by the fact that the limit switch It has not been actuated in time by disk D. 4) Device according to claim 1 characterized in that the covers of the latch and of its keeper comprise a magnetic contact C cutting the power supply to the latch as long as the door is not closed.  5) Device according to claim 1 characterized in that a push button Bp, with electrical contact closed with the repus, allows to cut locally the power supply of the lock, thus causing its opening. 6) Device according to the rendering 5 characterized in that one of the terminals of the push button Bp of local control is accessible to allow the commissioning or deactivation, remotely, of said local control. 8) Device according to claim 1 characterized in that a PNP transistor TR2 and a resistor R4 allow to deliver on a terminal Bs a signal indicating that the lock is closed. 9) Device according to any one of claims t to 8 characterized in that all the electrical and electronic elements which contribute to the operation of the assembly: limit switches, diodes, relays, transistors, capacitor, resistors, terminals for connecting the lock, the magnetic contact of the cover, the local control push button, etc. are grouped together on a single printed circuit fixed to the bottom of the lock frame.