FR2816977A1 - Electrically powered door lock has motor with screw and nut drive to slide actuating bolt - Google Patents

Abstract

The electrically powered door lock has a plate (1) on which a sliding bolt (3) is mounted for actuation by a slide (6) connected to an electric motor (14) for movement between locking and release positions. The motor has a screw and nut drive (12,13) with the nut connected (15) to the slide to allow sliding when the nut is between two end positions.

Description

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 The present invention relates to an electrically operated lock usable for example for closing doors or more generally a flap hinged to an edge of an opening formed in a wall to be movable between a position of release of the opening and a closing position of the opening.

 We know, in particular from document FR-A-2 656 909, a lock which comprises a plate or faceplate on one face of which a bolt is mounted to slide between an active position projecting from an opposite face of the faceplate and an inactive position retracted, and a bolt control device between these two positions.

The control device comprises a slide which is associated with an electric motor to be driven in translation perpendicular to the direction of sliding of the bolt between a locking position and an unlocking position and which is connected to the bolt by a mechanism for transforming the translation of the slide between its locking position and its unlocking position by sliding the bolt between its active position and its inactive position respectively. Such a lock is more particularly intended to be embedded in a housing formed in the thickness of the door frame so that the headrest is flush with one side of it. The perpendicular arrangement of the slide and the bolt allows the production of locks of small dimensions.

 In this front lock, the motor rotates, about an axis parallel to the direction of translation of the slide, a cylinder provided externally with a helical thread and a flat which extends over the entire length of the cylinder and has no helical thread. An operating button is integral with the slide and is arranged to cooperate with the helical thread of the cylinder. Thus, the engine is capable, in

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 rotating, to move the slide between its locked position and its unlocked position by the cooperation of the helical thread and the operating button. At each of these positions, the flat is opposite the slide and the operating button is released from the helical thread. The slider can then be maneuvered between these two positions by means of an additional control device such as the bit of a barrel actuable by means of a key.

 The main drawback of this type of lock is the difficulty in producing the helical thread cylinder. In addition, to ensure optimal operation of the lock, it is necessary to very precisely adjust the helical thread cylinder and the slide control button relative to each other. The lock thus produced is for these reasons relatively expensive.

 It would therefore be interesting to have a means of simplifying the structure of the chain for transmitting the movement generated by the electric motor to the slide.

 To this end, there is provided, according to the invention, a lock comprising a headrest on one face of which are mounted at least one bolt to slide between an active position projecting from an opposite face of the headrest and a retracted inactive position and a control device for the bolt between its two positions, the control device comprising a slide which is associated with an electric motor to be driven in translation between a locking position and an unlocking position and which is connected to the bolt to match the slide locking position in the active bolt position and the slide unlocking position in the inactive bolt position, the motor driving a transmission screw on

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 which is engaged a movable nut between a first extreme position and a second extreme position and connected to the slide by connecting means arranged to match the first extreme position of the nut to the locking position of the slide and the second extreme position of the nut in the unlocking position of the slider, and to allow the slider to move from one of its two positions to the other when the nut is in an intermediate position between its two extreme positions.

. engagé l'écrou permet d'avoir des moyens de liaison de l'écrou au coulisseau relativement simples et permettent que, pour une position donnée de l'écrou, le coulisseau puisse se déplacer entre ses deux positions. This structure incorporating a transmission screw driven by the engine and on which is

. engaged the nut makes it possible to have relatively simple means of connecting the nut to the slide and allow that, for a given position of the nut, the slide can move between its two positions.

 According to a particular embodiment, the connecting means comprise a first element integral with the slide, a second element integral with the nut, two stops integral with one of the elements and spaced parallel to the direction of sliding by a distance substantially equal to that separating the locking and unlocking positions of the slide, the other of the two elements extending between these stops to cooperate with them, and the stops being preferably formed by end edges of a lumen elongate formed in a part of the slide parallel to the sliding direction to receive a part of the sliding nut.

 The structure of the means for connecting the nut to the slide is then particularly simple.

 According to an advantageous characteristic, the lock comprises an additional control device comprising a cylinder integral with the headrest and equipped with a movable bit to cooperate with the slide and

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 move it between its locking and unlocking positions.

 Thus, the lock can be actuated purely mechanically, for example by means of a key inserted in the cylinder or a button for operating the bit.

 According to a second advantageous characteristic, the lock comprises a safety device incorporating an electromagnetic suction cup comprising an electromagnetic part secured to the headrest and a ferromagnetic control part which is movable between a position glued to the electromagnetic part and a position spaced from the latter in which it is resiliently recalled and which is connected to the slide by connecting means to, on the one hand, allow the movement of the slide between its two positions when the control part is in the glued position and, on the other hand, maintain , or if necessary bring and maintain, the slide in its unlocked position when the control part is in the spaced position, and preferably, the means for connecting the control part to the slide comprise a first element integral with the slide and a second element integral with the control part, one of the elements nts having an elongated lumen parallel to the sliding direction to receive a portion of the other sliding member, the lumen having parallel to the sliding direction a dimension which is substantially equal to the distance separating the locking and unlocking positions of the slide.

 The safety device allows, in the event of a power supply failure, to keep the lock in the unlocked position for example to facilitate the evacuation of the occupants of the building closed by the door

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 on which the lock is mounted.

 According to another particular characteristic, the lock comprises an elastic return device interposed between the headrest and the slide to return the slide to its locked and / or unlocked position when the slide is close to the position concerned, preferably the elastic return device is a hard point device comprising an element connected to the headrest and to the slide to be movable between two stable positions which correspond to the locking and unlocking positions of the slide and which are located on either side of an unstable position corresponding to an intermediate position of the slide located between its locking and unlocking positions.

 Other characteristics and advantages of the invention will emerge on reading the following description of a particular non-limiting embodiment of the invention.

 Reference will be made to the accompanying drawings, in which: - Figure 1 is a partial perspective view, with exploded view, of a lock according to the invention, - Figures 2, 3 and 4 are partial profile views of this lock respectively in the unlocked position, in the locked position and in the unlocked safety position, - Figures 5. a, b, c, d and e are schematic partial views breaking down the transmission of the bolt control movement, the lock being shown respectively in the unlocked position, during locking, in the locked position, during unlocking, in the unlocked position, - Figure 6 is a partial view in

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 perspective and enlarged of the lock according to the invention.

 The lock described here is intended to equip a fixed frame embedded in an opening in a wall and on which is hinged a panel forming a leaf, for example a door. The lock is in this case arranged to form a lock of the built-in type which is arranged in a housing formed in one side of the frame opposite the articulation of the panel. The lock can also be mounted in a housing formed on an edge of the panel.

 With reference to the figures, the lock according to the invention comprises a faceplate 1 elongated on a face 2 of which are mounted a bolt 3 for sliding perpendicular to the faceplate 1 between an active projecting position of an opposite face 4 of the faceplate and a retracted inactive position, and a device, generally designated at 5, for controlling the bolt between its two positions. A housing 25 is fixed on the face 2 of the headrest 1 to cover the bolt and the control device.

 The control device 5 comprises a slide generally designated at 6, here formed of two parallel rods 6.1 and 6.2, and mounted on the face 2 of the headrest 1 to slide between a locking position (shown in FIGS. 3.5 b and 5. c) and an unlocking position (shown in Figures 1,2, 4,5. A, 5. d and 5. e).

 The rods 6.1, 6.2 forming the slide 6 each have an end 7 articulated to a first lever 8 (in fact the first lever 8 is here split) having an end mounted to pivot on the face 2 of the headrest 1 and an opposite articulated end with two rods 9 parallel to each other and to the headrest 1 and of which an opposite end is articulated at one end of a second lever 10 (the second lever 10 is

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 also split) which has an opposite end mounted to pivot on the face 2 of the headrest 1 and which extends parallel to the first lever 8. The headrest 1, the levers 8 and 10, and the links 9 thus function in the manner of 'a deformable parallelogram. The use of split and parallel elements (slide rods, levers, links) makes it possible to avoid as much as possible elements of the chain of transmission of the movement thus formed are in overhang, which would increase friction and could in particular lead to jamming.

 The levers 8 and 10 and the links 9 form part of a mechanism for transforming the sliding movement of the slide 6 between its two positions into a movement of the bolt 3 between its two positions which is arranged in such a way that the movement of the slide 6 towards its locked position causes the bolt 3 to move towards its active position (the bolt 3 being in its active position when the slide 6 is in its locked position, see FIGS. 3.5 b and 5. c) and that the movement of the slide 6 towards its unlocking position causes the movement of the bolt 3 towards its inactive position (the bolt 3 being in its inactive position when the slide 6 is in its unlocked position, see FIGS. 1, 2, 4, 5.a, 5.d and 5.e). A movement transformation mechanism of this type is described in particular in document FR-A-2 656 909. It is also possible to envisage connecting rods for controlling additional bolts to the slider (variant not illustrated).

 The rods 6.1, 6.2 forming the slide 6 each have, opposite its end 7, an end 11 which is associated with a nut 12 engaged on a transmission screw 13 forming the output shaft of an electric motor 14 translation drive

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 slide 6 between its two positions connected to means for supplying electrical energy, not shown. The nut 12 is here constituted by a cylindrical piece provided transversely with a thread and is movable between a first extreme position (shown in Figure 5. b) and a second extreme position (shown in Figure 5. d).

 An elongated lumen 15 is formed in the ends 11 of the rods 6.1, 6.2 of the slider 6 parallel to the sliding direction of the latter for slidingly receiving the opposite ends of the nut 12. The end edges 16,17 of the light 15 form two stops which are spaced parallel to the sliding direction by a distance substantially equal to that separating the locking and unlocking positions of the slide, and are intended to cooperate with the ends of the nut 12 so that the nut 12 moving towards its first extreme position brings the slide 6 into its locked position (figure 5.b) and that nut 12 moving towards its second extreme position brings the slide 6 into its unlocked position (figure 5 d). In addition, this arrangement of the connection of the nut 12 to the slide 6 allows the slide 6 to move from one of its two positions to the other when the nut 12 is in an intermediate position (shown in FIGS. 5. a , 5. c and 5. e) between its two extreme positions.

 The lock further comprises an additional control device comprising a cylinder 18 (visible only in FIG. 2) secured to the face 2 of the headrest 1 and equipped with a movable bit 19 to cooperate with a notch 20 formed in the rods 6.1 and 6.2 of the slide 6 and move the latter between its locking and unlocking positions.

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 The lock further comprises a safety device incorporating an electromagnetic suction cup bearing the general reference 21 and comprising an electromagnetic part 22 which is integral with the face 2 of the headrest 1 and which is connected to means of supplying electrical energy, not shown. , and a ferromagnetic control part 23 which is movable between a position glued to the electromagnetic part 22 (position represented in FIGS. 2 and 3) and a position spaced from the latter (position represented in FIG. 4) in which it is recalled elastically (in this case by an associated spring mounted on the control part 23).

 The control part 23 is connected to the second lever 10 so as, on the one hand, to allow the displacement of the slide 6 between its two positions when the control part 23 is in the glued position and, on the other hand, to maintain, or if necessary bring and maintain the slide 6 in its unlocked position when the control part 23 is in the spaced position. The control part 23 thus comprises, opposite to the electromagnetic part 22, an elongated lumen 24 parallel to the sliding direction for slidingly receiving a hinge pin secured to the second lever 10. The lumen 24 has a dimension parallel to the sliding direction which is substantially equal to the dimension separating the locking and unlocking positions of the slide 6 (this axis being at the same distance from the pivot axis of the lever 10 on the headrest 1 as that separating the articulation of the slide 6 to the first lever 8 and the pivot axis of this lever on the headrest 1). It will be noted that the production of an elongated light promotes the guiding of the control part 23 but is not necessary, a simple stop

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 provided on the control part to push back the second lever 10 being sufficient to ensure the function of the control part 23.

 In normal operation, the electromagnetic part 22 is supplied and the control part 23 is in its glued position.

 The bolt 3 being in its inactive position, the slide 6 in its unlocking position and the nut 12 in its intermediate position, the slide 6 can be brought into its locking position either by the actuation known per se of the bit 19, either by actuating the electric motor 14 by means, for example, of a switch, of an access card inserted in a reader connected to the motor or of any other control mode (FIGS. 1, 2, 5.a and 5. e). In FIGS. 2 to 5, a vertical axis has been shown in dashed lines identifying the so-called intermediate position of the nut 12.

Relative to this position, the two extreme positions of the nut are substantially symmetrical, that is to say that the intermediate position here is substantially median.

 The driving in rotation of the motor 14 in its first direction of rotation causes the rotation of the transmission screw 13 which, the nut 12 being fixed in rotation, drives the nut 12 to its first extreme position. The nut 12 in abutment against the end edge 16 of the slot 15 drives the slide 6 towards its locking position (FIG. 5 b). The positions of the nut 12 along the transmission screw 13 are determined, with a view to controlling the motor, for example by position sensors of the nut 12 (contact, magnetic, optical or other) and / or by counting the number of turns made by the transmission screw 13 (which makes it possible to determine the length of the movement as a function of the pitch of the screw). Slide 6 positions

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 are determined for example by means of contact position sensors, magnetic, optical or other.

 The motor 14 is then automatically controlled to turn in its second direction of rotation, opposite to the first direction, and return the nut 12 to its intermediate position (FIG. 5 c). The slider 6 then remains in its locking position, the nut 12 sliding in the slot 15 and stopping near the end edge 17 thereof.

 The slide 6 can then be brought into its unlocking position either by the actuation known per se of the bit 19, or by the actuation of the electric motor 14, or also by the control part 23 resiliently returned to its detached position due an interruption of the supply of the electromagnetic part 22.

 The driving in rotation of the motor 14 in its second direction of rotation causes the rotation of the transmission screw 13 which drives the nut 12 towards its second extreme position. The nut 12 in abutment against the end edge 17 of the slot 15 drives the slide 6 towards its unlocking position (FIG. 5 d).

 The motor 14 is then automatically controlled to turn in its first direction of rotation and return the nut 12 to its intermediate position (Figure 5. e).

The slide 6 then remains in its unlocked position, the nut 12 sliding in the slot 15 and stopping near the end edge 16 thereof.

 It will be noted in FIG. 6 that the lock according to the invention comprises an elastic return device, generally designated at 26, interposed between the faceplate 1 and the slide 6 to return the slide 6 either in its locked position or in its position

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 unlocking, when it is near the position concerned.

 The elastic return device 26 is here a hard point device which comprises, on the one hand, a U-shaped jumper 27 which is mounted to pivot around an axis 28 perpendicular to the sliding direction of the slide 6 on balusters 29 fixed on the face 2 of the headrest 1 on either side of the slider 6 and, on the other hand, a tee 30 whose bar 31 is mounted between the rods 6.1 and 6.2 of the slider 6 to pivot around an axis perpendicular to the sliding direction of the slide 6 and parallel to the axis 28 and the leg 32 has a free end received slidingly in a bore 33 formed in the bottom 34 of the jumper 27. A helical compression spring 35 extends around of the leg 32 between the bar 31 and the bottom 34.

 When the slider 6 is in a middle position between its locking and unlocking positions (see FIG. 6), the bar 31 is located under the axis 28 so that the spring 35 is in a state of maximum compression.

 When the slider 6 is moved from this central position to its locking position or its unlocking position, the spring 35 expands and spreads the bar 31 and the rider 27 which pivot in the opposite direction. The spring thus exerts a force which facilitates the displacement of the slide 6 towards this position.

 On the other hand, when the slide 6 is in its locked position or its unlocked position, the force of the spring 35 tends to oppose the movement of the slide 6 towards its middle position, such movement tending to compress the spring 35.

 Thus, the elastic return device 26 completes bringing the slide in one or the other of

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 its locking and unlocking positions when moving the slide from its middle position towards the latter and maintains the slide in this position by opposing the effect of gravity on the slide when the lock is arranged vertically.

 Of course, the invention is not limited to the embodiment described and it is possible to make variant embodiments without departing from the scope of the invention as defined by the claims.

 Thus, the invention also covers other structures for connecting the nut 12 to the slide 6 and the control part 23 to the lever 10, and in particular means for connecting the nut 12 to the slide 6 and the control part 23 to the lever 10 produced from kinematic reversals operated on the structure of the connection means as described. In addition, the connection means may be integral with elements added to the slide 6, the nut 12, the control part 23 and the lever 10.

 In addition, as a variant of the elastic return device with a hard point which ensures a return of the slide in its two locking and unlocking positions, a simplified device can be provided ensuring a return of the slide in only one of its two positions.

Claims (8)

 end of the nut at the slide locking position and the second end position of the nut at the slide unlocking position, and to allow the slide to move from one of its two positions to the other when the nut is in an intermediate position between its two extreme positions.

 CLAIMS 1. Lock comprising a headrest (1) on one face (2) of which are mounted at least one bolt (3) for sliding between an active position projecting from an opposite face (4) of the headrest and an inactive position retracted and a control device (5) of the bolt between its two positions, the control device comprising a slide (6) which is associated with an electric motor (14) to be driven in translation between a locking position and a position unlocking and which is connected to the bolt to correspond the locking position of the slide to the active position of the bolt and the unlocking position of the slide to the inactive position of the bolt, characterized in that the motor drives a transmission screw (13) on which is engaged a nut (12) movable between a first extreme position and a second extreme position and connected to the slide by connecting means (15) arranged to f first correspond position  2. Lock according to claim 1, characterized in that the connecting means comprise a first element (11) integral with the slide (6) and a second element integral with the nut (12), and in that two stops (16 , 17) are integral with one of the elements and spaced parallel to the sliding direction by a distance substantially equal to that separating the locking and unlocking positions of the slide, the other of the two elements extending between <Desc / Clms Page number 15>  these stops (16, 17) to cooperate with them.  3. Lock according to claim 2, characterized in that the stops are formed by end edges (16,17) of an elongated slot (15) formed in a part (11) of the slide (6) parallel to the sliding direction for receiving part of the sliding nut (12).  4. Lock according to any one of claims 1 to 3, characterized in that it comprises an additional control device comprising a cylinder (18) integral with the headrest (1) and equipped with a movable bit (19) for cooperate with the slide (6) and move the latter between its locking and unlocking positions.  5. Lock according to any one of the preceding claims, characterized in that it comprises a safety device incorporating an electromagnetic suction cup (21) comprising an electromagnetic part (22) integral with the headrest (1) and a ferromagnetic control part (23) which is movable between a position glued to the electromagnetic part and a position spaced from the latter in which it is resiliently recalled and which is connected to the slide (6) by connecting means (24) for, firstly, to allow the slide to move between its two positions when the control part (23) is in the glued position and, secondly, to maintain, or if necessary bring and maintain, the slide (6) in its unlocked position when the control part (23) is in the spaced position.  6. Lock according to claim 5, characterized in that the means for connecting the control part (23) to the slide (6) comprise a first element (10) secured to the slide (6) and a second element secured to the part one of the elements (23) <Desc / Clms Page number 16>  having an elongated lumen (24) parallel to the sliding direction for receiving a portion of the other sliding element, the lumen having a dimension parallel to the sliding direction which is substantially equal to the dimension separating the locking and locking positions unlocking the slide.  7. Lock according to any one of the preceding claims, characterized in that it comprises an elastic return device (26) interposed between the headrest (1) and the slide (6) to return the slide in its locked position and / or unlocking when the slide (6) is near the position concerned.  8. Lock according to claim 7, characterized in that the elastic return device (26) is a hard point device comprising an element connected to the headrest (1) and to the slide (6) to be movable between two stable positions which correspond to the locking and unlocking positions of the slider and which are situated on either side of an unstable position corresponding to an intermediate position of the slider located between its locking and unlocking positions.