FR2719625A1 - Elevator door safety bolt lock control - Google Patents

Abstract

The control (1) for the bolt (2) of an elevator door safety lock comprises an activator (3) supplied by a positive or negative signal. The position of the bolt is modified either by an independent return spring (4), of force F, at the time of cutting the supply, or by the activator when supplied.A bi-stable system interposed between the bolt and the activator comprises a main mechanical retaining system (7,7A,7B) which acts on the bolt with a force F1. There is a complementary retainer (8) of force F2<F1. The sum of the forces is greater than the force F of the return spring, thereby allowing the bolt to take up a position of locking or unlocking. The other bolt position is obtained by suppressing the complementary force F2 allowing the return spring to overcome the single force (F1).

Description

Device for controlling a locking or unlocking device, in particular a bolt of a safety lock for a lifting device.

The present invention relates to a device for controlling a locking or unlocking device, in particular a landing gear safety threshold of a lifting device.

For the record, it is recalled that in a lift installation, the landing door for a floor considered must open only when the cabin is upstairs. For this purpose, it is known to use a positive security lock, that is to say the bolt is released completely provided that all the parameters concerning the closing of the door are combined.

For this purpose, an arm of a lever control lever of the bolt is actuated in a frontal or lateral plane by a fixed or movable cam integral with a lift truck cabin.

However it is not possible pcssible to have such a cam actuating the bolt.

This is the case, for example, of lifts which do not have a cabin and which are intended for the movement of disabled persons in wheelchairs.

This is also the case of elevator cabs whose landing doors all open in one direction, except one which for technical reasons must open in the other.

It is understood that in the latter case, the cam which is equipped with the cabin can not perform its function in several cases.

To overcome these disadvantages, it is known to use electrical control devices able to act directly on the latch bolt or, in some specific cases, on the cam.

One of these devices consists of having an electromagnet whose movable ferromagnetic core is connected to a control member that can be a bolt according to the chosen application example.

This electromagnet is controlled from a signal, electrical for example, given according to the position of a cabin or a platform.

It is understood that to act on a bolt, which also has a mechanical return member, this requires a certain force of attraction, leading to a fairly large coil. In addition, such an electromagnet coil has another disadvantage residing in the fact that during all the time of immobilization of the cabin to a floor, for example at night, the coil will be fed continuously to maintain the pin in opening position and consequently it will cause a heating resulting in rapid destruction of the coil.

The present invention aims to remedy these types of disadvantages, and relates for this purpose, a control device, a locking member or unlocking including a bolt of a landing device safety lock device elevator, comprising an actuating means, activatable from a signal acting positively or negatively on its power supply so as to modify the position of said member, or by means of a force independent return component F when a power failure, or by a power supply of said actuating means, characterized in that it comprises a bistable system interposed between the member to be controlled and the actuation meansX substituting it after activation, bistable system comprising on the one hand a main mechanical means, but not complete of the member, acting on it by a holding force
F1, and secondly a supplementary force retaining means F2 <F1, the sum of forces F1 + F2 being greater than the force F of the return component in order to overcome the resistance thereof and allow the member to take a position of locking or unlocking and to be maintained by the addition of the forces Fl and F2. The latter can be very weak because complementary, the other position of the member being obtained by removing the complementary force F2, thus allows the force return component F to overcome the single force Fl, the main mechanical means of restraint and thus allowing the passage of the organ in the other position.

 It is of course understood that the invention is not applicable solely to locks of lifting apparatus but also to all remote control devices, as for example in pull-laced systems as used on anti-panic doors in supermarkets.

The following description, made with reference to the accompanying drawings will better understand how the invention can be achieved.

Figures 1 and 2 respectively show a control device according to the invention, in the locking position and unlocking a member to be controlled.

Figures 3 and 4 respectively show a control device according to an alternative embodiment, in the locking position and unlocking a member to be controlled.

Figures 5 and 6 respectively show a control device according to a third embodiment, in the locking position and unlocking a member to be controlled.

Figures 7 and 8 respectively show a control device according to a fourth variant embodiment, in the locking position and unlocking a member to be controlled.

FIG. 9 is a force decomposition diagram relating to the device according to FIGS. 7 and 8.

Figures 10 and 11 respectively show a control device according to a fifth embodiment in the locking position and unlocking a member to be controlled.

The device designated as a whole in FIGS. 1 and 2 is intended to control a locking or unlocking member 2. By way of nonlimiting example, this member 2 is constituted by a bolt of a landing door safety lock. lift device.

We will agree that according to the representation chosen, the control member 2 is in the locking position in Figs 1,3,5,7 and 10 in the unlocked position in Figures 2,4,6,8 and 11.

We will also agree that the terms "bistable" and "cimblot" used hereinafter respectively define a mechanical system having a tilting point from one position to another on the one hand and a generally cylindrical conformation element on the other hand.

The control device 1 comprises an actuating means 3 which can be activated from a signal acting positively or negatively on its power supply so as to modify the position of said member 2 by driving it towards a locking position or towards an unlocking position. . This is done either via an independent biasing component 4 of force F during a power failure, or by a power supply of said actuating means 3.

In this case, it will be an electrical signal capable of activating an electric motor 3, constituting the actuating means, an electric motor 3 whose rotary movement is applied to a rectilinear movement rack connected to a rod portion of order 5.

Of course, the actuating means may be constituted by a pneumatically actuated cylinder or hydraulically controlled or by any other means.

Similarly, the independent force return component 4 of force F is constituted here by a compression spring, but may be constituted by any other means acting on the member 2 while resting on a fixed part 6.

According to an essential characteristic of the invention, the control device 1 comprises a bistable system interposed between the member 2 to be controlled and the actuating means 3 substituting for it after activation. This bistable system comprises firstly a mechanical means 7 main but not complete retention of the member 2 acting on it in a force that retaining F1, and secondly a complementary retaining means 8, force F2 <F1, the sum of the forces F1 + F2 being greater than the force F of the return component 4 so as to overcome the resistance thereof and allow the member 2 to take a locking or unlocking position and to be maintained by the addition of the forces F1 and F2. The latter can be very weak because complementary, the other position of the member 2 being obtained by removing the complementary force F2, allowing the return component 4 of force F to overcome the only force F1, the mechanical retaining means main 7 and thus allowing the passage of the member 2 in the other position.

More specifically, the main mechanical retaining means 7 is constituted by a zeu of jaws 7a, 7b actuated elastically towards each other and articulated on a plate 9 common to the actuating means 3 and the free ends of which jaws 7a, 7b defining between them a passage of smaller dimensions than those of a cimblot 12 carried by a rod portion 5 connected to the actuating means 3.

In this way, during the emission of a signal, said cimblot 12 is linearly assisted to pass on the other side of the elastic jaws 7a, 7b to be retained.

The main retaining force F1 of the mechanical means 7 can be obtained by two springs 7c, 7d which generate a retaining force F1.

Still according to the example of Figures 1 and 2, the complementary retaining means 8 is constituted by an electromagnet whose movable ferromagnetic core 8a is integral on the one hand of the block 12 for a portion of rod 5a and on the other hand the member to be controlled 2 by another rod portion 5b, said rod portions 5a and 5b being integral with each other linearly, so that the energizing of said electromagnet 9 occurring simultaneously with the activation of the means of actuation 3, causes the passage of the cimblot 12 on the other side of the jaws 7a, 7b towards the actuating means 3 and its retention behind them by their force Fl and by a complementary electromagnetic force F2 provided by the electro magnet 8.

The actuating means 3 is then deactivated, and the member to be controlled 2 for example takes a locking position.

According to an alternative embodiment shown in the figures, the jaws 7a, 7b of the main retaining means comprise at their free ends two rollers 10 and 11.

According to the alternative embodiment shown in FIGS. 3 and 4, the device 1A comprises a complementary retaining means 13 constituted by an electromagnet whose mobile ferromagnetic core 13a is slidably mounted on the rod portion 5 connecting the actuating means 3 to the Cimblot 12, said core 13a extending outwards towards the rollers 10,11 of the jaws 7a, 7b of the main mechanical holding means 7, by a stirrup 14 in the shape of a U. The activation of the actuating means 3 causes the clutch 12 to pass on the other side of the rollers 10, 11 in the direction of the actuating means 3. The energization of the electromagnet 13 then causes the retention of the clam 12 behind the rollers 10, 11 and the support of the stirrup 14 against said rollers 10,11 according to an orce F2 provided by the electromagnet 13 to the core 13a carrying the stirrup 14 and the force F1 of the rollers 10, 11. The means actuator 3 is then deactivated, the mmander 2 for example taking a locking position.

According to the embodiment shown in Figures 5 and 6 the device 1 3 comprises an electromagnet 15 whose movable ferromagnetic core 15a is slidably mounted on the rod portion 5 connecting the actuating means 3 to the cimblot 12 said core 15a is extending outwards towards the rollers 10, 11 of the jaws 7a, 7b of the main mechanical holding means 7 by a U-shaped stirrup 16, a spring 17 constituting the complementary force retaining means F2 being interposed between the stirrup 16 and a fixed part of the housing 18 of the electromagnet 15 so that when it is off, the pin 12 being on the side of the actuating means 3 relative to the rollers, 10, 11 l yoke 16 is applied freely against them according to the force F2 of the spring 17 adding to the force F1 of the rollers 10, 11 for a locking position of the control member 2, while the power of said electro magnet 15 p rovoque the attraction of the stirrup 16 and consequently the compression of the spring 17 of force F2 and the release of the rollers 10, 11 and the passage of the cimblot 12 on the other side of the rollers 10, 11 in the opposite direction of said actuating means 3 for an unlocking position, for example, of the control member. According to a variant not shown, the complementary retaining means is constituted by a counter-electromotive force F2 applied to the electric actuating motor 3.

According to an alternative embodiment shown in FIGS. 7, 8 and 9, the device 1c comprises a mechanical main retaining means 7A that is constituted by a connecting rod-crank system in which the crank 20 is articulated around a fixed axis O secured to a plate 9 on which are also fixed the actuating means 3 and the complementary retaining means 22 of force F2. Said crank 20 is actuated in rotation by the actuating means by means of a control rod 5 connected to the crank 20 by an axis 23, so that the rod 21 can be driven, during the activation of the actuating means 3, by an eccentric axis 26 of the crank 20 to a position of quasi-equilibrium of the assembly relative to the articulation 0 and as a function of the independent return component 4 of force F to which is subject said rod 21 via the movable ferromagnetic core 4 of an electromagnet constituting the complementary retaining means 22 and a hinge 25. Said complementary retaining means 22 has a force F2 of sufficient value to ensure the retention of the whole crank-handle system 21, 20 in a locking position for example.

With reference to the diagram of FIG. 9, the determination of the force F 2 of the electromagnet 22 to be applied to the connecting rod 21 in order to ensure the balance of the assembly in a locking position, for example, takes place from the following way F xr = Fa x R
= Fa = = xr
R as R = r = Fa = F xr = F sin &alpha; sin r
sine on the other hand Fa = F2 = F2 = Fsin &alpha; = F2 = F (slnt sing sin
Value of q when cannait the ratio F2 / F

According to another variant embodiment shown in FIGS. 10 and 11, the device 1D comprises a mechanical main retaining means 73 of force F1 which is constituted by a link 30 connected on the one hand to a first articulation point 31 formed on the control rod 5 of the actuating means 3, and secondly at a second pivot point 32 formed at the end of a rod 33 integral with a movable ferromagnetic core 34 of an electromagnet constituting the means complementary restraint 35, the axis of alignment of the rod 30 and the core 34 for an unlocked unlocking position for example, being perpendicular to the axis of alignment of the actuating means 3 of the control rod 5 and of the organ to be controlled 2, so that during the activation of the actuating means 3 and dru complementary means 35, the rod 30 forms an angle g corresponding to a quasi-equilibrium thereof on the axis of the control rod 5, relative to the restoring force F of the independent component 4, the complementary retaining means having a value F2 sufficient to ensure the retention of the entire system in a locking position for example.

According to this last case F1 = F tgp + friction.

Claims (9)

 1) Control device (1, 1A, 13, 1C, 1D) of a member (2) for locking or unlocking, in particular a latch of an elevator door safety lock, comprising an actuating means (3) activatable from a signal acting positively or negatively on its power supply so as to modify the position of said member (2) or via an independent return component (4) of force F during a power supply cutoff or by a power supply of said actuating means (3), characterized in that it comprises a bistable system interposed between the member to be controlled (2) and the actuating means (3) substituting to it after activation, a bistable system comprising on the one hand a main mechanical means of main but not complete (7, 7A, 7B) of the member (2) acting on it by a retaining force Fl, and on the other hand complementary retaining means (8,13,17,22,35) of force F2 <F1 , the sum of the forces Fl + F2 being greater than the force F of the return component (4) so that it can overcome the resistance thereof and allow the member (2) to take a locking or unlocking position and to be maintained by the addition of the forces F1 and F2, the latter being very weak because complementary, the other position of the member (2) being obtained by suppressing the complementary force F2, allowing the component that reminder (4) of force F to overcome the only force 1, the main mechanical means (7, 7A, 73) and allowing the passage of the member (2) in the other position.  2) Device according to claim 1 characterized in that the main mechanical retaining means (7) is constituted by a set of jaws (7a, 7b) actuated elastically towards each other and articulated on a plate (9) common by means of actuation (3) and defining between them a passage of smaller dimensions than those of a cimblot (12) carried by a rod portion (5) connected to the actuating means (3) so that when the transmission of a signal said cimblot (12) is driven linearly to pass on the other side of the elastic jaws (7a, 7b) to be retained.  3) Device according to claim 2 characterized in that the jaws (7a, 7b) of the main retaining means  (7) have at their free ends two rollers 10, 11.  4) Device according to one of claims 1 to 3 characterized in that the complementary retaining means (8) is constituted for an electromagnet whose movable ferromagnetic core (8a) is secured on the one hand of the cimblot (12) by a portion of rod (5a) and secondly of the member to be controlled (2) by another rod portion (5b), said portions of tigers (5a and 5b) being integral with each other linearly, so as to the energizing of said electromagnet (8) occurring simultaneously with the activation of the actuating means (3), causes the cimblot (12) to pass from the other side of the jaws (7a, 7b) towards the actuating means (3) and its retention behind them by their force F1 and by a complementary electromagnetic force F2 provided by the électo magnet (8), the actuating means (3) then being deactivated, the organ to control (2) taking for example then a locking position.  5) Device according to one of claims 1 to 3 characterized in that the complementary retaining means (13) is constituted by an electromagnet whose movable ferromagnetic core (13a) is slidably mounted on the rod portion (5) connecting the actuating means (3) to the cimblot (12), said core (13a) extending outwards towards the rollers (10,11) of the jaws  (7a, 7b) of the main mechanical retaining means (7) by a U-shaped stirrup (14), so that the tensioning of the actuating means (3) causes the cimblot to pass through ( 12) on the other side of the jaws (7a, 7b) in the direction of the actuating means (3) and its retention behind them by their force F1 and by energizing the complementary retaining means (13) causing pressing the stirrup (14) against the jaws (7a, 7b) according to a force f2 supplied by the means (13) to the stirrup bearing core (13a) (14) sliding in a direction opposite to that moving the pin (12), the actuating means (3) then being deactivated, the member to be controlled (2) taking for example a locking position.  6) Device according to one of claims 1 to 3 characterized in that it consists of an electromagnet (15) whose movable ferromagnetic core (15a) is slidably mounted on the rod portion (5) connecting the means for actuating (3) the cimblot (12) said core (15a) extending outwards towards the jaws (7a, 7b) of the main mechanical holding means (7) by a stirrup (16) in the form of U, a spring 17 constituting the complementary force retaining means F2 being interposed between the stirrup (16) and a fixed part of the housing (18) of the electromagnet (15) so that when it is de-energized, the cimblot (12) being on the side of the actuating means (3) with respect to the jaws (7a, 7b) the stirrup (16) is applied freely against them according to the force F2 of the spring (17 ) in addition to the force F1 of the jaws (7a, 7b) for a locking position of the control member (2), while the powering up of the says electro magnet (15), causes the stirrup attraction  (16) and consequently the compression of the spring (17) F2 force and the release of the jaws (7a, 7b) and the passage of the cimblot (12) on the other side of said jaws in the opposite direction of said means d actuating (3) for an unlocking position, for example, of the control member (2).  7) Device according to claim 1 characterized in that the mechanical main retaining means (7A) of force F1 is constituted by a connecting rod-crank system in which the crank 20 is articulated about a fixed axis (O) solidary d a plate (9) on which are also fixed the actuating means (3) and the complementary force retaining means (22) F2, said crank (20) being  actuated in rotation by the actuating means (3) via a control rod  (5) connected to the crank (20) by an axis (23), so that the connecting rod (21) can be driven, upon activation of the actuating means (3), by an eccentric axis  (26) of the crank (20) towards a position of quasi-equilibrium of the assembly relative to the articulation (0) and as a function of the independent return component (4) of force F to which said rod (21 ) via the movable ferromagnetic core (24) of an electromagnet constituting the complementary retaining means  (22) and an articulation (25), said complementary retaining means (22) having a force F2 of sufficient value to ensure the retention of the entire crank-handle system (21, 20) in a position of lock for example.  8) Device according to claim 1 characterized in that the mechanical main retaining means (7B) of force F1 is constituted by a rod (30) connected firstly to a first point of articulation (31) formed on the rod control (5) of the actuating means (3), and secondly at a second point of articulation (32) formed at the end of a rod (33) integral with a movable ferromagnetic core (34). ) an electromagnet constituting the complementary retaining means (35), the axis of alignment of the rod (30) and the core (34) for a deactivated unlocking position for example, being perpendicular to the axis' alignment of the actuating means  (3) of the control rod (5) and the member to be controlled 2, so that when the actuating means 3 and the complementary means (35) activate the connecting rod  (30) forms an angle (3 corresponding to a quasi equilibrium thereof on the axis of the control rod (5), relative to the restoring force r of the independent component (4), the retaining means complement having a value F2 sufficient to ensure the retention of the entire system in a position of e-raking for example.  9) Device according to one of the preceding claims characterized in that the actuating means (3) is an electric motor whose rotary motion is applied to a rectilinear movement rack connected to a control rod portion (5).