FR2695675A1 - Electromechanical lock with solenoid and/or motor actuators - has bolt operated by linear motion of slotted cam=plate, with bolt retained and released magnetically or mechanically - Google Patents

Abstract

When energised, the actuating solenoid (44) draws its core plunger (40) into a concentric non-metallic liner tube (42). The plunger rod (39) pulls in the disk armature (38) of the retention relay (34) against a return spring (33), and with it the associated cam-plate (4). A pin (6) in the cam slot (17) is fixed to the bolt (2), which is thus constrained to move transversely during the stroke, into the locked position protruding from the lock-case. A plate-position sensor (23) then energises the retention coil (36), sealing in the relay. On opening this circuit, the return spring releases the bolt. Alternatively, the main solenoid is replaced by a motor effecting the plate movement through a worm drive or cam wheel. USE/ADVANTAGE - For controlling emergency or access doors. Low energy consumption while locked.

Description

The present invention is similar to patent No. 8310292, describing an electric lock for emergency exit and for access control. This lock is actuated by an electromagnet with a plunger core which, by means of a movable plate, projects a bolt and keeps it protruding thanks to the plunger core when bonding, the electromagnet remaining energized. One drawback of this lock is the high consumption of this type of electromagnet. For an equivalent bonding force, an electromagnet with an electromagnetic plate or suction cup consumes ten times less current. However, the suction cup alone is unable to attract the lock from its open position to its closed position, that is to say to mobilize the movable plate. It can only retain a position previously obtained. Two possibilities make it possible to solve the problem which consists in bringing the lock to its closed position and keeping it closed electromagnetically with low electrical consumption: these two possibilities are, on the one hand, a couple juxtaposing an electromagnet and an electromagnetic suction cup, and, on the other hand, an electric motor and electromagnetic suction cup cooperation,
The first possibility consists in the realization in a single v ′, of an electromagnet couple with an electromagnetic plunger-suction cup core. This is explained below in detail, with the help of drawings. we recognize the parts of patent 8310292: the movable plate 4, the oblique slot 17 and the ball bearing 6 which will communicate the movement to the bolt 2, movement triggered by the electromagnetic block object of the present invention.

The centerpiece of the block is a metal tube 31, having at one end a shoulder 32 on which a spring 33 abuts. One side of the tube will include the electromagnetic suction part, the other, the electromagnet part. A shouldered metal washer 34 has a narrow peripheral portion which will constitute the bottom of the suction cup and a thicker central portion 35 which will be the core in which the coil 36 of the suction cup will fit.

The washer 34 is dimensioned so that it can be introduced into very strong friction in the internal wall of the tube 31, until the base of the central portion is in the same geometrical plane as the edge 37 of the tube. Thus, the counter plate 38 of the suction cup will come to be applied tightly both on the periphery 37 of the tube and on the flat 35 of the washer 34, capable of closing the magnetic circuit generated by the coil 36 introduced in the portion 35 The axis of the shouldered washer 34 is drilled right through to let pass and slide a rod 39 which will secure the counter-plate 38 and the plunger core 40 of the electromagnet which will be described below. other end of the tube 31. To mount this electromagnet, a thick washer 41 is forced into it, to a depth which will determine the plunging depth of the core 40. The central hole of the washer 41 has a precise diameter which allows the forced insertion of a hollow brass tube 42 which will serve as a guide for the movement of the plunger core 40 whose diameter allows it to slide freely in the tube 42.

The latter is fixed by its other end to a washer 43 comprising a small central shoulder forcibly blocking the tube 42, which washer 43 is crimped until complete engagement in the 2nd ex> end of the tube 31. The mounting of this assembly will therefore be done in the following order: the washer 34 then the coil 36; on the other side, the washer 41 then the brass tube 42. Then engage the core 40 provided with its rod 39. We will introduce the coil 44, having provided a hole for the passage of the wires. Finally, the washer 43 will be engaged, closing the assembly. The end of the rod 39 will be fixed to the counter plate 38, which will be hooked by a stirrup to the movable plate 4. FIG. 2 shows the lock closed. The coil 44 being supplied, the plunger core 40, pulled by by means of the rod 39 the assembly against the plate 38 and the movable plate 4. The plunger core 40 is on bonding as is the counter plate 38. The proximity detector 23 has been described in patent g31ORS2. the end of travel of the movable plate 4. The detector 23 excites a relay with several work-rest contacts. One of these contacts switches the power supply to the coil 44 in the bovine 36. At this time, the lock is held in the closed position by the suction cup, which is the aim sought. During the attraction of the counterplate 38, the spring 33 has been put in compression. The cut of the current of the coil 36, releases the counterplate 38 and the spring 33 repels it as well as all the mobile assembly in the open lock position of FIG. 1. The lock has then completed its cycle and the detector 23 has returned to its first state: the contact supplying alternately the two coils having returned to the telail position towards the coil 44. The lock is ready to receive the closing order by sending the current to coil 44.

 This description is not restrictive. It also includes any junction of an electromagnet and a suction cup already individually formed, the result being obtained by fixing one behind the other whatever the order, then requiring either to pierce the suction cup to leave pass the rod connecting the core against the plate, or pierce the bottom of the electromagnet to allow this connection, provided that the rod is made of non-magnetic metal (stainless steel for example) as in electro pushers, so as not to be short -circuit the magnetic field before the departure of the plunger core.

 In another embodiment, still revolving around patent 83 10292, in order to advance the movable plate and the counter plate to which it is fixed, towards an electromagnetic suction cup, the electromagnet is replaced by an electric motor which will turn a wheel on which a ball bearing acting like a cam, will bring the counterplate onto the suction cup.

Figures 3 and 4 show this further improvement of patent 83 10292, respectively in the open and closed situations and Figure 5 shows a sagittal view of the assembly
In FIG. 3, the main elements of patent 83 10292 are recognized, the movable plate 4, the oblique slot 17 with double obliquity, the ball bearing 6 which, in its movement transmitted by the slot 17, causes the bolt 2 to descend.

To push the movable plate 4, an electric motor 27 with worm, drives a coaxial toothed wheel of a large low-cut part. FIG. 5 shows this part 28 with the toothed part 28bis, its lower axis rotating in the chassis 1, the upper part being a wheel 28ter shouldered against a fine ball bearing 28quater with large diameter which allows it to rotate in the plane of the fixed plate 3. Fixed on the wheel 28, but eccentric, and being in the same plane as the movable plate 4, a small ball bearing 29 will act like a cam, coming into contact to roll along the edge 30 of the movable plate. FIG. 3 shows the motor 27, the large shouldered wheel 28, the bearing 29, in the neutral position on the left, the lock therefore being in the open position. Fixed by a stirrup to the movable plate 4, the counter plate 38 is in the situation distant, pushed back by the spring 33 of the suction cup 54. FIG. 4 shows the state when the wheel 28 mobilized by the motor 27 has made a U-turn during which the bearing 29 rolling on the edge 30, has pushed back the movable plate 4 to the right, towards the electromagnet 38 against which the counterplate 38 has come to stick, while at the same time compressing the spring 33.

The counterplate 38 remains stuck to the suction cup 34, the coil of which has been supplied at the same time as the motor control 27. This control is programmed to perform a single revolution of the wheel 28, while the latter and its bearing 29 complete their rotation and return to their starting point on the left, the counter plate 38,, therefore the movable plate and consequently the bolt 2 remain in the closed lock position, by the magnetic retention of the electromagnet against plate 34-38. The opening control of the lock is done by simply cutting off the supply voltage of the coil of the suction cup 34. At this time, the spring 33 pushes the counter plate 3S and the movable plate 4, which causes the pin 2. The lock is then unlocked.

 It is apparent that the electro-magnetic block can be replaced by a persistent mechanical block. I1 is sufficient for a programmed electrical control of a half turn of the wheel 28, without supplying the coil of the suction cup. Following this command, the bearing 29 stops after a rotation of 1800 and the latter, stopped to the right, blocks the movable plate 4 mechanically. At this time, in the absence of any current, the lock is blocked. From this state, you can either unlock it, releasing the door, or change the mechanical lock into a magnetic panic lock.

In both cases, by a programmed command, the wheel 28 performs a rotation of 1800. If this command is isolated, the spring 33 pushes the movable assembly, causing the bolt to go up. If this command is coupled with a energization of the coil of the suction cup, the counterplate remains blocked, and consequently, the lock is in electro-magnetic anti-panic blocking.

 An electronic device controls the various situations of the motor and the electromagnet against the plate, and provides information on the situation of these various elements on a central command and control panel. A printed circuit 45, supporting the necessary electrical elements, will be placed a little above the plane of the movable plate 4 and of the bearing 29. I1 will support the proximity detector 23, the position detectors 4 '.. of the bearing 29 and all the other electrical and electronic elements necessary for the operation of the lock and for the return of information to the remote control and remote monitoring panel. The electronic devices for operating the tensioning, half-turn and full turn of the wheel 28 can be placed either in the lock, or in the remote control panel, located in a control room.

 The figure. 6 shows another mode of cooperation of the engine with the mechanics described in patent 83 10292.

The motor used with a reduction gear has an outlet axis which is a threaded rod 27bis, which cooperates with a threaded part 28 guided by a rail 29 cut out from the fixed plate 3. The threaded part 28 abuts against the edge 30 of the movable plate and pushes it when the rotation of the EFGis threaded rod mobilizes the part 28. When the counterplate 38 has reached bonding, at the end of the stroke, the detector 23 reverses the rotation of the motor which brings the threaded part 28 back to the starting position , while the counter plate remains stuck to the supplied suction cup.

 FIG. 7 shows a variant in which the motor rotates a threaded toothed wheel in its axis, which, by turning, displaces a threaded rod 27 bis whose rotation is opposed by a longitudinal groove, and which has at its end a part 28 making buffer against the movable plate 4. The operating principle is the same as before, using a reversal of the direction of rotation of the motor at the end of the travel and programming of the movements by microprocessor.

Claims (1)

 Claims Claim 1: Electro-mechanical security lock for emergency exits comprising a bolt with a keeper, characterized in that it comprises, for protruding and then maintaining the protrusion of the bolt, an electromagnetic device with linear movement, composed of the juxtaposition an electromagnet with plunger core 40-44 and an electromagnet against a plate 36-38, also called an electromagnetic suction cup, said electromagnetic device being produced in one piece by a tube 31, with shoulder 32, on which a spring 33 abuts, a shouldered washer 34 crimped by force in the tube 31, a coil 36 coming to be embedded in the shoulder 35, a washer 41 crimped in the tube 31, comprising a brass tube 42 surrounded by 'a coil 44, the said brass tube being fixed at its other end to a shouldered washer 43 crimped at the end of the tube 31, a plunger core 40 sliding in the tube 42 and being secured to the cont plate 38 by a rod 39, sliding in a central hole drilled in the washer 34 and its shoulder 35, the counterplate 38 resting on the spring 33, which is compressed when the plunger core 40 comes to bonding, this same repelling spring the assembly against the plate and the plunger core secured by the rod 39 when the coils of the electromagnets are de-energized. Claim 2: Electro-magnetic security lock according to claim 1 characterized in that the shoulder washer 34 has the central shoulder 35, constituting the central core of the suction cup, a coil 36 surrounding said central core, which is drilled through in part to be crossed and allow the rod to slide 39. Claim 3 Electro-mechanical security lock according to claim 1 characterized in that the washer 43 and its shoulder, the washer 41 and the brass tube 42 which unites them by the center, tube surrounded by the coil 44, these two washers 41 and 43 crimped in the tube 31, form the body of an electromagnet with a plunger core 40 which slides in the tube 42. Claim 4 Electro-mechanical safety lock according to claim 1 or 2 characterized in that the projection of the bolt and its maintenance in projection are ensured by the coaxial junction in an indifferent order, of an electromagnetic suction cup and an electromagnet with plunger core, the plunger core and the counterplate being secured by a rod passing through either the central core and the bottom of the suction cup, or the bottom of the electromagnet in the direction of the junction. Claim 5: Electro-mechanical security lock according to one of the preceding claims, characterized in that it comprises a position detector 23 of the movable plate 4 providing information on the retracted or projecting position of the bolt.