ES2276100T3 - ELECTRIC LOCK ASSEMBLY. - Google Patents

Abstract

The electrically-operated door strike provides rapid and easy selection between fail-safe and fail-secure modes. A keeper (1) is pivotably arranged in a housing (2). To prevent the keeper from pivoting, the keeper has at least one abutment (16), which a blocking surface (18) or surfaces of a blocking element (20) either contacts (door locked) or does not contact (door unlocked) when the keeper tries to pivot. The blocking element is movable by a solenoid (22), between a first (unenergized) position and a second (energized) position. The blocking element and solenoid are mounted in a holder (30), which in turn is slidably mounted in a housing (2), for movement between one of two holder positions, namely a fail-secure position and a fail-safe position. In the fail-secure position, the blocking surfaces are opposite the keeper's abutments in the unenergized position, and in the fail-safe position the blocking surfaces are opposite the keeper's abutments only when the actuator is energized. A two-position mode selector (60), accessible from outside the housing and set at the time of installation, establishes which of the two holder positions is used, i.e. whether the strike is installed in fail-safe or fail-secure mode. In the preferred embodiment, the mode selector is an eccentric (63), rotatable between two positions 180 degrees apart, and having a pin (62) which engages the holder. A latch monitor arm (82) indicates whether or not the door is latched. A lip bracket engages the housing with a saw-tooth feature, and provides for depth adjustment. The keeper and housing are shaped to prevent intrusion.

Description

Electric strike set.

Technical sector

The invention refers to mechanisms door blockers, more particularly to mechanisms electric door blockers, commonly known as electric strikes

Electric strikes, also known as electric door openers, electric releases and locksmiths of electric release, are used to control access to Buildings or areas. Drive means (for example a electrically driven motor or solenoid) is used to block or release a retaining part capable of rotating to prevent or allow the release of the latch of a door, to block the door or allow it to open.

Typically, electric strikes have two modes, a mode called "security against failures" (where the door is locked with the elimination of energy, that is, the drive means must be tripped to allow the door opens), and a mode called "security against everything risk "(where the door is unlocked with the removal of energy, that is, the drive means must be tripped to prevent the door from opening). Some market locksmiths they have only capacity for one mode, that is, security against failures or security against all risks, while others are dual mode, that is, the installer can select which mode is desired in The time of installation.

Prior art

A well-known dual mode electric strike, for example, available as the GEM GK-300 model and ROFO 2400 series models, it has a solenoid mounted on a support, which is mobile inside the locksmith's housing. A blocking element is directly attached to the piston of the solenoid, to block the movement of the retainer when the strike is in its locked position. A first screw, reachable from outside the housing, cooperates with a slot in the housing, to define the path along the which support is mobile When the first screw is tightened, This fixes the support to the housing, i.e. the support cannot be move. A first and second holes are placed in the accommodation, to align alternately with a second screw, also attainable from outside the housing, by such that at each final position along the trajectory of support movement, one of a third or fourth threaded hole, both placed in the support, is aligned with the first or second hole, and the second screw can be inserted into an appropriate first or second hole and screwed into the third or fourth hole visible. The installer can configure the GEM strike in any of the security modes against all risks or security Faults by selecting which holes are used. But nevertheless, doing so is a tedious and committed process, requiring a correct alignment of holes, careful removal and Screw replacement, and careful loosening (without remove) from another screw.

Another assembly of electric strike is known of US-A-5490699.

There is a need to obtain a strike electric which is more easily interchangeable between modes security against failures and security against all risks, and which preferably it offers other advantages over the locks of the prior state of the art.

Exhibition of the invention

In view of the above, an object of the invention is to provide an improved electric strike, which among other features, it provides a quick and easy selection between security modes against failures and security Against all risk.

In the invention, a piece is placed retainer to pivot in the housing. When you avoid that pivot from its original position, the retaining piece blocks the movement of a latch extending from a door, so that The door is locked. When the retaining piece is allowed to pivot, the latch can push the piece aside retainer, so that the door can be open. To avoid the pivot retainer, the retainer has at least one buttress, on which a blocking surface or surfaces of a blocking element contact (door locked) or not contact (door unlocked) when the retainer tries to pivot. The blocking element is mobile thanks to a means of drive, for example a solenoid, between a first position (rest) and a second position (work). The blocking element and the actuation means of the blocking element are mounted on a stand, which in turn is movable in a housing, for the movement between one of the two stand positions, which are a safe position against failures and an insurance position against all risks. In position safety against faults, the blocking surfaces are opposite to the buttress of the retaining part in a position of at rest, and in the safe position against all risks blocking surfaces are opposite the part buttress retainer only when the actuator is working. A two position mode selector, set at the time of installation, set which of the two stand positions is used, that is, if the strike is installed in safety mode against all risk or security against failures. In the example of preferred embodiment, the mode selector is an eccentric, capable to rotate between two positions 180 degrees apart, accessible from Outside the accommodation

The strike preferably also has a monitor arm of the pivotable latch mounted in the housing. When the latch is in place on the button, that is, when the door is closed, the latch presses a plate that rotates the latch monitor arm, carrying a cam in contact with the Switching button of a micro switch, thus indicating If the door is open or closed.

The strike preferably also has a micro switch of the retaining part placed in the housing and cooperating with the disruption indicator placed on the piece retainer to indicate when the retainer is in its original position, or in its rotated position, indicating the opening of the door. The micro switch of the retainer is actuated when the retainer is in a position, and does not act in the another position of the retainer, by a surface of the retaining part by pressing or not by pressing the switch button of the retaining part micro switch.

The assembly of the strike includes a support of mouth attached to the housing, to allow a dimensional adjustment in the place. The mouth support preferably has surfaces profiled cooperating with similarly profiled surfaces in the housing, to provide a staggered position adjustment relative of the mouth support to the housing together with the lock positive of the mouth support of the housing when the support of Mouth is secured to accommodation. In the embodiment example preferred, a sawtooth coupling is used, as will be described below in detail.

As a feature of anti-intrusion in the preferred embodiment example, to prevent someone from inserting something to try to move the blocking element and in this way open the door, the retaining part is profiled to provide little or no slack between it and the accommodation, and in addition, an edge is provided in the housing for gripping anything inserted and the retainer is configured to  direct anything inserted to the area of this edge.

More features of the invention will be described or will be made apparent in the course of the following detailed description.

Brief description of the drawings

So that the invention can be understood more clearly, the preferred embodiment thereof will be now described in detail, as an example, with reference to accompanying drawings, in which:

Fig. 1 is a rear perspective view exploded from a strike according to the embodiment favorite;

Fig. 2 is a partial assembly view corresponding to Fig. 1, where the blocking element, solenoid  and support have been mounted;

Fig. 3 is a remote assembly view corresponding to Figs. 1 and 2, where the blocking element, solenoid, support and retaining part have been mounted on the accommodation;

Fig. 4 is a view corresponding to Fig. 3, but also shows a mouth support and a sheet superficial;

Fig. 5 is a view corresponding to Fig. 4, showing the mounting of the housing mounted with the support mouth;

Fig. 6 is a view corresponding to Fig. 5, showing the complete assembly;

Fig. 7 is a perspective view exploded similar to Fig. 1, but looking at the front of the example  of preferred embodiment;

Fig. 8 is a view corresponding to Fig. 7, more mounted;

Fig. 9 is a view corresponding to Fig. 8, fully assembled;

Fig. 10 is a sectioned top view that shows the sawtooth coupling between the housing and mouth support;

Fig. 11 is a view showing the support, solenoid, blocking element, mode selector and a spring mode selector trigger;

Fig. 12 is a perspective view corresponding to Fig. 11, from a different angle;

Fig. 13 is a perspective view of only the support;

Fig. 14 is a perspective view corresponding to Fig. 13, from a different angle;

Fig. 15 is a perspective view of the blocking element;

Fig. 16 is a perspective view of a safety mode selector against failures versus safety against all risks;

Fig. 17 is an elevation view of the selector mode of Fig. 16;

Fig. 18 is a perspective view of a alternative mode selector;

Fig. 19 is an elevation view of the selector alternatively;

Fig. 20 is a perspective view of a latch monitor arm;

Fig. 21 is a sectioned rear view that shows the latch monitor arm cam when the arm of latch monitor is rotated externally;

Fig. 22 is a sectioned rear view showing latch monitor arm cam when arm latch monitor is pressed, firing the micro switch latch monitor;

Figs. 23A-23E shows a sequence of operation of the latch monitor while the door is closed, from the position of Fig. 23A where the latch is approaching the strike, to the position of Fig. 23E where the latch is fully extended and retained for the retained piece
dora;

Fig. 24 is a sectioned front view of the strike, in safety mode against all risks, with the solenoid in idle state and the blocking element therefore in a position to allow the retainer to rotate;

Fig. 25 is a view corresponding to the Fig. 24, with the solenoid in working state and the element blocker therefore in a position to prevent the piece retainer rotate;

Fig. 26 is a sectioned front view of the strike, in safety mode against failures, with solenoid in working state and the blocking element therefore in position to allow the retainer to rotate;

Fig. 27 is a view corresponding to the Fig. 26, with the solenoid at rest and the element blocker therefore in position to prevent the retainer piece rotate

Fig. 28 is a sectioned rear view, showing several components previously described and in particular an anti-intrusion profile;

Fig. 29 is a perspective view of a alternative embodiment, illustrating a solenoid of type push button instead of a puller type solenoid;

Fig. 30A and 30B are side views and later respectively, which show a mode selector alternative using a two-position lever, shown in mode security against all risks;

Figs. 31A and 31B are side views and later respectively, corresponding to Figs. 30A and 30B, shown in safety mode against failures;

Figs. 32A and 32B are side views and later respectively, which show another mode selector alternative using a two-position pin or button, shown in security mode against all risks; Y

Figs. 33A and 33B are side views and later respectively, corresponding to Figs. 32A and 32B, shown in safety mode against failures.

Figs. 1-6 show a progressive construction of the strike seen from the side later; Figs. 7-9 are similar, but since The front part.

Preferred embodiment of the invention

In the preferred embodiment of the invention, a retaining part 1 is positioned to pivot in a housing 2, and is pivotable between a rotation position where the latch 3 of a door 4 can be removed from the strike to open the door, and an original position (best view in Fig. 23A) where the retaining part, if it is impeded from movement, blocks the removal of the latch and in this way maintains the locked door When the retainer can pivot, the latch can push the retaining piece aside, so that the Door can be opened. The retainer pivots on two axes 6 at opposite ends thereof, which fit into slots 8 in the housing (see Fig. 7) and which are trapped there by surfaces 10 on a mouth support 12 (see Fig. 4). The retainer is predisposed in favor of its original position by suitable diversion means, such as a spring 14 of corrosion resistant torsion.

For the door to be locked, that is, so that the retaining part is prevented from pivoting, the part retainer has at least one and preferably several buttresses 16, whose blocking surfaces 18 of a blocking element 20 or oppose (door locked) or do not oppose (door unlocked) when the retainer tries to pivot. In the example of preferred embodiment, there are two locking surfaces 18, but obviously there could be only one, or there could be more than two, subject to obvious space restrictions. The blocking element it is mobile thanks to drive means, for example a solenoid 22, between a first position (rest) and a second position (work). In the preferred embodiment, the solenoid is a "puller" type solenoid, although it may be used a "push button" type instead, as described subsequently below and as illustrated in Fig. 29. The Solenoid has power cables (not shown) guided inside the housing and to external terminals 26. Preferably but not necessarily, the solenoid is a double winding and has four wires, to provide flexibility to through the option to connect to direct or alternating current, to 12 or 24 volts As an illustration, the solenoid is shown without its typical insulating cover.

The blocking element 20 and the solenoid 22 they are mounted on a bracket 30. The solenoid pulls a plunger 32, against the activating force of a spring 34, which preferably It is made of stainless steel for corrosion resistance. The plunger has a disc portion 36 at the distal end of the same, and a relief area 38 that fits into a groove 40 in a sheet at the end of the blocking element. This links the item. blocker to the movement of the piston, such that, when the solenoid is actuated, it is blocking element is pulled towards the solenoid, thus moving the locking surfaces 18 in or out of the coupling with the buttresses 16 of the retainer, depending on the way it was selected at the time of installation. In the mode of safety against faults, the solenoid drive moves the blocking surfaces outside the coupling (i.e. they they usually lock in a no-current mode, so the door is locked) while in security mode against all risks, the solenoid drive moves the blocking surfaces towards the coupling (i.e. they normally they don't lock in a no-current mode, therefore the door is unlocked).

The blocking element is guided at one end. by the piston 32 of the solenoid, and at the other end in the face posterior by a tongue 42 in a groove 43 under a guide rail 44, and on the front face by a projection 46, which extends under a guide 47 in the holder.

The support 30, on which the blocking elements 20 and solenoid 22, is in turn mounted scrollable in housing 2, for movement between one or two positions of the support, specifically a position of security against failures and an insurance position against everything risk. The support is held in place from front to back, being caught between the housing and the back plate 48, and It has 49 aligned projections which cooperate with 50 slots aligned placed on the back plate and in the housing. The back plate is secured to the housing by screws 52 which they pass through holes 53 in the back plate and are introduced in holes 54 of the housing.

In the safety position against failures, the blocking surfaces 18 are opposite to buttresses 16 of the retainer in a rest position, and in the position safety against all risks the blocking surfaces are opposite to the buttresses of the retaining part only when The actuator is in working position. A mode selector two positions, for example an eccentric 60, establishes which of the two positions of the support is the one used, i.e. if the strike is installed in security mode against all risks or security Failure The mode is set by the installer in the time of installation.

In the preferred embodiment, the mode selector 60 is able to rotate through a head 61 of groove between two positions 180 degrees apart, projecting at through a hole 68 in the housing and therefore accessible from outside the accommodation. The preferred mode selector has a portion of eccentric disk 63, and a pin 62 extending Centrally from it. Head rotation 180 degrees, using a screwdriver or even a small coin, causes the eccentric disc portion 63 and the pin 62 are in one of The two separate positions. Since the disk portion 63 fits into a slot 64 on the back of bracket 30, its selector rotation rotation results in the displacement of the support in the housing from a position to another, that is, from a position of security against failures, to a security position against all risks. Pin 62 fits in a groove 65 in the holder 30, and serves to maintain the mode selector in any position that is selected, thanks to a spring 72 acting on the plug to hold it predisposed towards the appropriate end of the groove 65. Preferably, the dimensions are positioned such that some support load is transmitted by the disk portion 63 instead of pin 62.

The preferred embodiment of the selector so it requires installation from inside the housing. In a alternative embodiment example, shown in Figs. 18 and 19, the mode selector 60 'has a pin 62 displaced with with respect to the head, and a cylindrical portion 69. This selector can be inserted through hole 68 from outside the accommodation, but requires an internal installation of a fork (not shown) in a groove 70 in the cylindrical portion, to prevent it from falling later. In this alternative As an exemplary embodiment, pin 62 takes some support load.

The two position mode selector is a key feature of the invention, since it provides a Very simple resource for the installer to switch between modes, Simply rotating the selector.

Once the selector is in the desired position, This of course is highly desirable to remain there. By consequently, in the preferred embodiment example, provide a means of deflection to move the selector, so that said selector remains in any one of its two positions that are selected. In the embodiment example preferred, this displacer resource is a spring 72 which is placed to push the plug towards an end position (in this case pushing approximately 90 degrees in a diameter line drawn between the two extreme points), as best seen in the Figs. 11 and 12. (In Fig. 12, the spring is shown in the position in which this would be if pin 62 were present, although without the plug this would in fact be done through the slot, since this pinches the plug away from the position in that the spring is shown). The spring 72 is a torsion spring in the preferred embodiment, mounted on a pole 74, but clearly this could be any other suitable provision,  including for example a leaf spring positioned to act in the same direction.

Referring now to Figs. 7, 8 and 20-22, the accommodation also includes a groove 80 in its front face to pivot holding a monitor arm of latch 82. The latch monitor arm is generally elongated, having a first end with an extension 83 that has a latch plate 84 at its distal end. To the extreme opposite of the arm is a cam 85 of micro switch. When a door latch is present in the strike, this it will press the sheet inside, and therefore rotate the arm of the latch monitor, so that the micro switch cam then shoot a micro switch 86, as seen in Figs. twenty-one and 22 in particular. A cover 87 protects the micro switch. He arm 82 of the latch monitor is apparently displaced by a latch arm shifter resource, for example, a spring Torque 88 (see Fig. 7).

Figs. 23A-23E show a operating sequence of the latch monitor while the door 4 is closed, from the position of Fig. 23A where the latch 3 is approaching the strike, to the position of the Fig. 23E where the latch is fully extended and retained by the retaining piece. In Fig. 23A, the door latch is still outside the strike and retaining part, and sheet 84 of latch is in its raised position. In Fig. 23B, the latch from the door has contacted the retainer and has begun to retract towards the door. Fig. 23C shows the entire retraction of the door latch on the door, and Fig. 23D shows the door latch just past the retainer and starting to extend again, contacting the latch plate. In Fig. 23E, the door latch has pressed the latch plate towards its pressed position, causing cam 85 to operate the micro switch 86, thus allowing remote control of The position of the door. Some of the details of these drawings they do not correspond to the preferred embodiment, being from a previous prototype, but the principle is the same.

A face plate 90 is secured to the support of mouth 12 by screws (not shown) through holes 93 in the face plate and holes 94 in the mouth support, and is used to secure the strike to the door frame using screws through mounting holes 95. The configuration of the face plate can be varied as desired, to adapt several New or existing door frame configurations. The support preferably has a profiled surfaces 96 that cooperate with similarly profiled surfaces 97 in the accommodation, to provide a gradual adjustment associated with a positive locking of the mouth support to the housing. The support of mouth is secured to the housing at the desired depth set by screws (not shown) through slots 110 in the bracket of mouth with holes 111 in the housing. The profiles preferably they are as shown in Fig. 10, that is, complementary surfaces of sawtooth, with embedded surfaces being perpendicular or almost like that in the direction to oppose outward in the displacement of the housing (as indicated by the arrow) relative to the support of mouth (that is, in the direction of pulling to open the door). He mouth support can have various size variations for accommodate ½ inch or 5/8 inch (or made any other size that can be adopted).

To absolutely detect the position of the retainer on the strike, retainer 1 advantageously it has a 98 indicator disruptor placed for cooperate with a micro switch 99 of the retainer, thereby that the micro switch of the retaining part is activated when the retaining part is completely removed, and out of any another position of the retainer. The disruptor causes the micro switch is not activated when the retainer is in its original position, but the rotation of the retaining piece carries the unevenness outside the disruptor in contact with the micro switch, to shoot it This provides an indication of the opening of the door, for statistical or other purposes.

Figs. 24 and 25 show the strike in its safety mode against all risks, that is, the retainer It is unlocked when the solenoid is at rest. Fig. 24 shows the solenoid at rest, and Fig. 25 shows it in position of work. It can be seen that in the previous position the blocking surfaces 18 are not aligned with the buttresses of retaining part 16 (free door), while in the last position they are (door locked).

Figs. 26 and 27 are similar, but show safety mode against failures, with solenoid in position working in Fig. 26 and the unlocked door, and the solenoid in resting position and the door locked in Fig. 27.

Referring now to Fig. 28, as anti-intrusion characteristic in the embodiment example preferred, to prevent someone from inserting something thin and flexible to try to move the blocking element and thereby open the door, the retaining part is profiled in such a way that provides a small or no clearance between it and the accommodation, and in addition a latch 100 is provided in the housing to block anything inserted and the piece retainer has a mouth 102 shaped to address any thing inserted in the area of this latch.

It will be appreciated that the above description concerns the exemplary embodiment only by way of example. Many variations of the invention will be obvious to those skilled in matter, and such obvious variations are within the scope of the invention described and claimed, expressly described or no.

For example, in addition to enabling variations specifically mentioned above, Fig. 29 shows a push button solenoid 22 'instead of the puller type preferred embodiment example. The blocking element is guided by a guide pin 106 of the blocking element, and a spring 108 in the guide pin predisposes the blocking element To the solenoid.

It will also be appreciated that the mode selector two positions could be configured differently, despite that eccentric placement is preferred. For example, I could have a small two position pivotable lever with a pin projecting from it, with the same two positions endings as in the preferred embodiment, and a spring arrangement to predispose the lever in any of The two positions. Or there could be a small slide bar with a pin projecting from it, again with the same two final positions and predisposed spring. Or, instead of a spring predisposed to the two final positions, there could be a notch or ball spring retainers or others that the elements of the mobile selector would fit. Some examples Additional are illustrated in Figs. 30A-33B, being the key that each mechanism gives rise to the movement of the pin 62 from one final position to another, so that it moves the support 30 from one mode position to another, the plug being or selector mode preferably predisposed by means suitable to then be in the selected position. In Figs. 30A-31B, the mode selector 60 'is a small lever, pivotable between two positions, with a pin 62 that extends through the housing and fits with support 30 as in the preferred embodiment example. In Figs. 32A-33B, the mode selector 60 '' is a button small, predisposed between two positions, again with a plug 62 that fits with bracket 30.

Some additional features or advantages They are as follows:

to.

He strike is equally suitable for a jamb installation for left or right hand.

b.

Dice that the retaining part is rotatably mounted, it is not required a separate hinge shaft.

C.

The position of the retainer is laterally adjustable by variables of the physical installation, using the possibility of adjustment side of the housing relative to the mouth support.

d.

He Locksmith has a compact design. The total thickness is typically 1-3 / 16 '' for a 5/8 '' (3/4 '' retaining part projection of the maximum latch), and 1-1 / 16 '' for a ½ '' (5/8 '') retaining part of the bolt projection maximum).

The choice of materials is not part of the invention itself. However, the retaining part is preferably molded ferrous metal injection, mold investment or bar removed, and provided with a suitable bathroom to provide a corrosion resistant retainer. He support is advantageously molded metal injection or mold inversion and the surface properly treated for resistance to corrosion The housing is preferably mold of investment or wedge mold and / or metal powder formed, and properly plating to provide corrosion resistant housing. The blocking element is preferably made of steel stainless to provide a material non-magnetic, and is advantageously a surface treated, for example plated, to minimize the coefficient of friction. The latch monitor arm is advantageously mold Wedge or investment mold. The mouth support is preferably wedge mold and / or inversion mold. Advantageously, it is provided a satisfactory aesthetic surface finish. The face plate is constructed of stainless steel or others materials of sufficient strength to achieve a finish of satisfactorily aesthetic surface which can resist required abuse during use.

Industrial applicability

The strike is suitable for buildings that require exit / entry control such as buildings commercial, hospitals, warehouses, and educational facilities, as non-limiting examples. The latch and the resources of retainer part monitor are used for intelligence of traffic, when the strike is connected to a system of security of a building, for example.

Claims (11)

1. Electric strike for a door, which understands: a lodging (2); a retaining part (1) pivotally placed in said housing (2), positioned to prevent the withdrawal of the latch (3) of a door when it is prevented from pivoting, and for allow the removal of said door latch (3) when it is allowed to swing; a support (30) movably mounted on said accommodation (2); a blocking element (20) mounted so movable in said support (30) having surfaces blockers (18) opposed to buttresses (16) of said piece retainer (1) to selectively prevent rotation of said retaining part (1), mobile between a locking position where the rotation of said retaining part (1) is impeded and a non-blocking position where the rotation of said piece Retainer (1) is allowed, moving to one of the such positions; a two position mode selector (60) operable from outside said housing (2) to move said support (30) movable between a safety position against failures and one of security against all risks, blocking said blocking surfaces the rotation of said piece retainer in said movable position when said support is in a safe position against all risks, and allowing the rotation of said retainer in said movable position when said support is in a safe position against everything risk; Y drive means (22) mounted on said support (30) for moving said blocking element (20) out of said movable position, to lock and unlock said retaining piece (1). 2. Electric strike according to claim 1, wherein said mode selector comprises an eccentric capable of rotating 180 degrees, said eccentric having an extended pin in it that fits into a slot in said support, thereby the eccentric movement of said pin displaces said support between the two final positions corresponding to the position of said plug to opposite ends of 180 degrees of rotation. 3. Electric strike according to claim 1, further comprising means for moving said selector so in any of these two positions that select 4. Electric strike according to claim 2, further comprising means for moving said selector so in any of these two positions that select 5. Electric strike according to claim 4, wherein said means for moving the mode selector is a spring positioned to act on said pin in a direction of approximately 90 degrees on a diameter line drawn between endpoints of said 180 degree trip of the plug. 6. Electric strike according to claim 1, further comprising a lever arm of the monitor of the latch mounted to pivot in said housing, said lever arm of the latch monitor an extension thereof with a plate positioned to be tightened when the latch is present in said strike, to thereby rotate said arm lever of the latch monitor from an original position towards which it is displaced, causing said rotation that a cam extends from said lever arm of the monitor of the latch up to gradual contact with a switch button on a micro switch, indicating in this way if the latch is present or not 7. Electric strike according to claim 1, further comprising an insurable mouth support to said accommodation along a contact point of any of the possible relative positions, and an insurable face plate to said mouth support and to a door frame for the installation of said strike. 8. Electric strike according to claim 7, wherein said contact point has projections complementary sawtooth from said housing and said mouth support, said projections having surfaces of union that are generally perpendicular to said points of contact in one direction to oppose the shift towards outside the housing relative to said mouth support. 9. Electric strike according to claim 1, wherein said drive means are a solenoid of shooter type connected to said blocking element, and said element blocker is displaced from said solenoid. 10. Electric strike according to claim 1, wherein said drive means are a solenoid of push button type and said blocking element is moved towards said solenoid. 11. Electric strike according to claim 1, wherein said retaining part and said housing are shaped in such a way that it provides substantially no hole between these when said retainer is in a initial position locked by said blocking element, and in the that said retainer has a mouth and said housing has a latch, said mouth being positioned to direct any flexible thing inserted towards said latch, blocking said latch a greater insertion.