Electric strike having an interchangeable actuator module

Abstract

An actuator-controlled electric strike operates in conjunction with a latch having an engaged position to secure a door in a closed state and a released position. The strike comprises a housing defining an entry chamber. A keeper is disposed in the entry chamber about an axis for rotation between a locked position and an unlocked position. A unitized actuator module is provided including a body, a keeper release and an actuator movable between first and second positions. When the actuator is in one of the first or second positions the keeper release is coupled to the keeper and the keeper is secured in the locked position. When the actuator is selectively moved to the other of the first or second positions the keeper release is decoupled from the keeper and the keeper is rotatable to the unlocked position.

Claims

1. An actuator-controlled electric strike for operating in conjunction with a latch of a lockset, wherein the latch has an engaged position so as to secure a door in a closed state and a released position, the strike comprising: a) a housing including a back wall, a bottom panel and side walls defining an entry chamber therein; b) a keeper disposed in the entry chamber about an axis of rotation parallel with the back wall, wherein the keeper is rotatable about the axis of rotation between a locked position and an unlocked position, and wherein the back wall is disposed opposite the keeper when the keeper is in the locked position; and c) an actuator module including a body, a keeper release configured to engage the keeper at a point between said axis of rotation of said keeper and said bottom panel of said housing, and an actuator selectively movable between a first actuator position and a second actuator position, wherein the actuator module is unitized in that the actuator is contained within the body and at least a portion of the keeper release is contained within the body, and wherein when the actuator is in one of the first actuator position or the second actuator position the keeper release is coupled to the keeper and the keeper is secured in the locked position, and wherein when the actuator is selectively moved to the other of the first actuator position or the second actuator position the keeper release is permitted to move in a linear direction toward the back wall, thereby permitting the keeper to rotate to the unlocked position.

2. The strike in accordance with claim 1 wherein the actuator module includes a keeper support, and wherein the keeper release and the keeper support are configured such that a load placed on the keeper when the keeper is in the locked position is transferred from the keeper through the keeper release and keeper support to the back wall of the housing.

3. The strike in accordance with claim 2 wherein the actuator module includes a keeper support bracket, and wherein the keeper support extends from the keeper support bracket.

4. The strike in accordance with claim 3 wherein the keeper support bracket includes an actuator extension that is coupled to the actuator, and wherein the keeper support bracket is selectively moveable by the actuator as the actuator moves between the first actuator position and the second actuator position.

5. The strike in accordance with claim 4 wherein the actuator module further includes a guide fixedly positioned relative to the body, wherein the keeper support bracket is slidably coupled with the guide.

6. The strike in accordance with claim 1, wherein the keeper release is a first keeper release, wherein the actuator module further comprises a second keeper release, and wherein the first keeper release and the second keeper release are disposed at opposite ends of the actuator module.

7. The strike in accordance with claim 1 wherein the actuator comprises a spring return solenoid and a plunger, wherein the keeper release is operatively coupled to the plunger and configured for movement when the actuator moves between the first actuator position and the second actuator position.

8. The strike in accordance with claim 1 wherein the actuator includes an actuating device comprising a springless electromagnet actuator including a magnet and a plunger, wherein the keeper release is operatively coupled to the plunger and configured for movement when the actuator moves between the first and second actuator positions.

9. The strike in accordance with claim 8 wherein the actuator module includes a microcontroller configured to sense a voltage having a first polarity supplied to the strike, wherein upon sensing the voltage having the first polarity the microcontroller drives the springless electromagnet actuator from the first to the second actuator position.

10. The strike in accordance with claim 9 wherein the actuator module further includes a constant-current, constant-voltage (CCCV) charger and a super capacitor, the microcontroller controlling the CCCV charger to charge the super capacitor after the springless electromagnet actuator has been driven to the second actuator position, the super capacitor being used to provide a second voltage having a polarity opposite the first polarity to drive the springless electromagnet actuator from the second actuator position to the first actuator position.

11. The strike in accordance with claim 1 wherein the actuator includes an actuating device comprising a stepper motor including a shaft, wherein the keeper release is operatively coupled to the shaft and configured for movement when the actuator moves between the first and second actuator positions.

12. The strike in accordance with claim 11 wherein the actuator module includes a microcontroller configured to sense a voltage having a first polarity supplied to the strike, wherein upon sensing the voltage having the first polarity the microcontroller drives the stepper motor from the first to the second actuator position.

13. The strike in accordance with claim 12 wherein the actuator module further includes a constant-current, constant-voltage (CCCV) charger and a super capacitor, the microcontroller controlling the CCCV charger to charge the super capacitor after the stepper motor has been driven to the second actuator position, the super capacitor being used to provide a second voltage having a polarity opposite the first polarity to drive the stepper motor from the second actuator position to the first actuator position.

14. The strike in accordance with claim 1 wherein the actuator module is a unitized first actuating module, wherein the unitized first actuating module is configured to be interchangeable with a unitized second actuating module of the strike, and wherein the unitized second actuating module includes a second body, a second keeper release configured to engage the keeper, and a second actuator selectively movable between a first actuator position and a second actuator position.

15. The strike in accordance with claim 1 wherein the housing is configured to receive one of a plurality of strike plates, wherein each of the plurality of strike plates are configured to accommodate different locksets.

16. The strike in accordance with claim 1 wherein the keeper includes an extendable face portion in communication with the entry chamber, a position of the extendable face portion being adjustable to define a width of the entry chamber.

17. The strike in accordance with claim 16 wherein the extendable face portion is adjusted using a set screw.

18. The strike in accordance with claim 1, wherein the lockset includes a deadbolt, wherein the strike further comprises a deadbolt bracket including a first wall having a first distal end, a second wall having a second distal end, and a bracket side wall connecting the first wall and the second wall, wherein the housing includes an upstanding wall defining at least a portion of the entry chamber, wherein the deadbolt bracket is disposed within the entry chamber, wherein the first and second distal ends are disposed against the upstanding wall, and wherein the deadbolt bracket and the upstanding wall define a deadbolt receiving chamber for the deadbolt.

19. The strike in accordance with claim 18 wherein the upstanding wall includes at least one of the side walls of the housing.

20. The strike in accordance with claim 19 wherein the deadbolt bracket includes a tab extending from the second distal end, wherein the at least one of the side walls of the housing has a slot defined therein configured for receiving the tab.

21. The strike in accordance with claim 20 wherein the first wall is mounted to the back wall of the housing.

22. The strike in accordance with claim 18 wherein the deadbolt bracket is U-shaped.

23. The strike in accordance with claim 1, further comprising a latch bolt monitor, wherein the housing is configured to receive the latch bolt monitor in the entry chamber.

24. The strike in accordance with claim 23 wherein the latch bolt monitor is mounted to the back wall.

25. The strike in accordance with claim 1, further comprising a trim plate disposed around the keeper.

26. The strike in accordance with claim 25 wherein the door is pivotally mounted to a door frame, and wherein the trim plate is mounted to one of the housing of the strike or the door frame.

27. The strike in accordance with claim 1, further comprising a lip extension including a bottom panel, a first side wing, and a second side wing, wherein the first side wing extends from a first end of the bottom panel of the lip extension, wherein the second side wing extends from a second end of the bottom panel of the lip extension, and wherein the lip extension is mounted to the housing.

28. The strike in accordance with claim 27 wherein the lip extension includes a rib disposed on the bottom panel of the lip extension that extends between the first side wing and the second side wing, and wherein the rib is disposed adjacent to a notch formed in the housing.

29. The strike in accordance with claim 27, further comprising a strike plate mounted to the housing, wherein at least one of the first side wing and the second side wing include a notch defined in a distal end that is configured for being disposed adjacent to the strike plate.

30. The strike in accordance with claim 27 wherein the bottom panel of the lip extension is positioned adjacent to the bottom panel of the housing.

31. The strike in accordance with claim 27 wherein the lip extension is U-shaped.

32. The strike in accordance with claim 1 wherein at least one of the side walls includes an edge, wherein the keeper includes a keeper base and a ramp element, wherein the ramp element includes a surface that is contactable by the latch, and wherein the surface of the ramp element extends beyond the edge of the at least one of the side walls when the keeper is in the locked position to prevent the latch from contacting the edge of the at least one of the side walls.

33. The strike in accordance with claim 32 wherein a profile of the surface of the ramp element matches a profile of the edge of the at least one of the side walls.

34. The strike in accordance with claim 32 wherein the surface of the ramp element includes a rounded profile.

35. The strike in accordance with claim 32 wherein the surface of the ramp element includes an extension flange that covers the edge of the at least one of the side walls when the keeper is in the locked position.

36. The strike in accordance with claim 1 wherein the housing includes a front profile, wherein the keeper includes a keeper base and a ramp element, wherein the ramp element includes a surface that is contactable by the latch, and wherein the surface of the ramp element extends beyond the front profile of the housing when the keeper is in the locked position to prevent the latch from contacting the edge of the at least one of the side walls.

37. An actuator-controlled electric strike for operating in conjunction with a latch of a lockset, wherein the latch has an engaged position so as to secure a door in a closed state and a released position, the strike comprising: a) a housing defining an entry chamber therein, wherein the housing includes a back wall and a bottom panel; b) a keeper disposed in the entry chamber about an axis of rotation, wherein the keeper is rotatable about the axis of rotation between a locked position and an unlocked position, and wherein the back wall is disposed opposite the keeper when the keeper is in the locked position; and c) an actuator module including a body, a keeper release configured to engage the keeper at a point between said axis of rotation of said keeper and said bottom panel of said housing, and an actuator selectively movable between a first actuator position and a second actuator position, wherein the actuator module is unitized in that the actuator is contained within the body and at least a portion of the keeper release is contained within the body, and wherein when the actuator is in one of the first actuator position or the second actuator position the keeper release is coupled to the keeper and the keeper is secured in the locked position, and wherein when the actuator is selectively moved to the other of the first actuator position or the second actuator position the keeper release is permitted to move in a linear direction that is perpendicular to the axis of rotation of the keeper, thereby permitting the keeper to rotate tothe unlocked position.

38. An actuator-controlled electric strike for operating in conjunction with a latch of a lockset, wherein the latch has an engaged position so as to secure a door in a closed state and a released position, the strike comprising: a) a housing including a back wall, a bottom panel and side walls defining an entry chamber therein; b) a keeper disposed in the entry chamber about an axis of rotation parallel with the back wall, wherein the keeper is rotatable about the axis of rotation between a locked position and an unlocked position; and c) an actuator module including: i) a body, ii) a keeper release configured to engage the keeper, iii) a keeper support, wherein the keeper release and the keeper support are configured such that a load placed on the keeper when the keeper is in the locked position is transferred from the keeper through the keeper release and keeper support to the back wall of the housing, iv) a keeper support bracket, wherein the keeper support extends from the keeper support bracket, wherein the keeper support bracket includes an actuator extension that is coupled to the actuator, and wherein the keeper support bracket is selectively moveable by the actuator as the actuator moves between the first actuator position and the second actuator position, and iv) an actuator selectively movable between a first actuator position and a second actuator position, wherein the actuator module is unitized in that the actuator is contained within the body and at least a portion of the keeper release is contained within the body, and wherein when the actuator is in one of the first actuator position or the second actuator position the keeper release is coupled to the keeper and the keeper is secured in the locked position, and wherein when the actuator is selectively moved to the other of the first actuator position or the second actuator position the keeper release is permitted to move in a linear direction toward the back wall, thereby permitting the keeper to rotate to the unlocked position.

39. The strike in accordance with claim 38 wherein the actuator module further includes a guide fixedly positioned relative to the body, wherein the keeper support bracket is slidably coupled with the guide.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

(1) The present invention will now be described, by way of example, with reference to the accompanying drawings, in which:

(2) FIG. 1 is a perspective view of an actuator-controlled electric strike in accordance with the present invention;

(3) FIG. 2 is an exploded view of the actuator-controlled electric strike shown in FIG. 1;

(4) FIG. 3 is a side view of the actuator-controlled electric strike shown in FIG. 1 with the housing shown in phantom view including a strike plate, and the keeper in the locked position;

(5) FIG. 4 is a side perspective view of the actuator-controlled electric strike taken along line 4-4 in FIG. 1;

(6) FIG. 5 is a top perspective view of an embodiment of an actuator module used with the actuator-controlled electric strike shown in FIG. 1 wherein the module housing is shown in phantom;

(7) FIG. 6 is a side view of the actuator-controlled electric strike shown in FIG. 1 with the housing shown in phantom view including the strike plate, and the keeper in the unlocked position;

(8) FIG. 7 is a side perspective view of the actuator-controlled electric strike shown in FIG. 6 along the same line as 4-4 in FIG. 1;

(9) FIG. 8 is a partial exploded bottom perspective view of an embodiment of an actuator module used with the actuator-controlled electric strike shown in FIG. 1;

(10) FIG. 9 is a schematic view of actuator circuit for use with an actuator-controlled electric strike in accordance with the present invention;

(11) FIG. 10 is a representative current diagram using the circuit shown in FIG. 9;

(12) FIG. 11 is a cross sectional perspective view of an actuator-controlled electric strike having an adjustable strike shim in accordance with the present invention with the adjustable strike flush with the keeper;

(13) FIG. 12 is a cross sectional perspective view of an actuator-controlled electric strike similar to FIG. 11 having the adjustable strike shim extending inwardly from with the keeper;

(14) FIG. 13 is a perspective view of an actuator-controlled electric strike including latch bolt monitors in accordance with the present invention;

(15) FIG. 14 is a perspective view of an actuator-controlled electric strike including a trim plate in accordance with the present invention;

(16) FIG. 15 shows various strike plates that may be used an actuator-controlled electric strike in accordance with the present invention;

(17) FIG. 16 is an exploded view of an actuator-controlled electric strike including a deadbolt bracket in accordance with the present invention;

(18) FIG. 17 is a perspective view of the actuator-controlled electric strike including a deadbolt bracket shown in FIG. 16;

(19) FIG. 18 is a perspective view of a prior art electric strike;

(20) FIG. 19 is a perspective view of a prior art mortise lock set;

(21) FIG. 20A is a perspective view of the actuator controlled electric strike in accordance with the invention and installed in a standard door frame;

(22) FIG. 20B is a perspective view of the actuator controlled electric strike in accordance with the invention and installed in a door frame that is wider than the door frame shown in FIG. 20A; and

(23) FIG. 21 is a perspective, exploded view of a lip extension and electric strike as shown in FIG. 20B, in accordance with the invention.

(24) Corresponding reference characters indicate corresponding parts throughout the several views. The exemplifications set out herein illustrate currently preferred embodiments of the present invention, and such exemplifications are not to be construed as limiting the scope of the invention in any manner.

DESCRIPTION OF THE PREFERRED EMBODIMENTS

(25) Referring now to FIGS. 1 and 2, an embodiment of an actuator-controlled electric strike having an interchangeable, unitized actuator module 26, in accordance with the present invention, is generally indicated by reference numeral 20. Strike 20 generally comprises a housing 22 and a keeper 24 rotatably mounted thereto. Unitized actuator module 26 (comprising a body 61 and an actuator 69 and a keeper release 62, wherein actuator 69 is contained within body 61 and at least a portion of keeper release 62 is contained within body 61see FIG. 5), when inserted into housing 22 as a unit, is configured to cooperate with keeper 24 so as to control locking and unlocking of keeper 24 as will be discussed in greater detail below with specific reference to FIGS. 3-7.

(26) Turning again to FIGS. 1 and 2, housing 22 includes an upstanding back wall 28 disposed opposite keeper 24 when keeper 24 is in a closed position, bottom panel 30 and opposing upstanding side walls 32, 34 thereby defining an entry chamber 36 having a depth (D). See FIG. 3. Side walls 32, 34 may include flanges 32A, 34A for receiving a strike plate 38. See FIGS. 1, 2, 13-17. Side walls 32, 34 may also include apertures 40, 42 configured to receive pivot pin portions 44, 46, respectively. Apertures 40, 42 are positioned so as to coincide with a corresponding through bore 48 passing along a length of keeper 24 such that, upon insertion of pivot pin portions 44, 46, along with spring pin portion 50, keeper 24 is pivotally mounted onto housing 22 and rotatable about an axis X parallel with back wall 28 (see FIG. 4). Spring pin portion 50 is configured to mount a biasing member such as coil spring 52 whereby the coil spring operates to bias keeper 24 toward the closed position, such as that shown in FIGS. 1, 3 and 4. Keeper 24 may further include an extendable face portion 54, integrated with keeper 24, which will be discussed in more detail below with regard to FIGS. 11 and 12. Leads 56 are connected at one end to an actuating device resident within actuator module 26 and extend outwardly from housing 22 wherein a second end 58 is connected to a power supply (not shown) so as to power the actuating device on demand.

(27) FIGS. 3 and 4 show various views of strike 20 with keeper 24 in the closed position and FIG. 5 shows the internal components of an exemplary embodiment 26 of an actuator module that may reside within housing 22. Generally, keeper 24 may include a notched portion 60 at the keeper end proximate through bore 48, the notched portion 60 is configured to engage a keeper release 62 slidably mounted within body 61 of actuator module 26. Keeper release 62, in turn, engages a keeper support 64 of actuator 69 also resident within actuator module 26. In this manner, the keeper is in the locked position such that any load placed on keeper 24 (such as an unauthorized attempt to open a door whose latch is secured within entry chamber 36 in the direction generally indicated by arrow 66FIG. 4) is transferred from the keeper through the release 62 to the keeper support 64 and ultimately to the back wall 28 of housing 22. A biasing member, such as a coil spring 67, operates to bias keeper release 62 into the extended, locked position shown in FIGS. 3-5.

(28) Referring now to FIG. 5, actuator module 26 includes keeper release 62 and actuator 69. Actuator 69, in turn, includes an actuating device 74, shown here as a solenoid, and an associated keeper support bracket 68 and keeper support 64. Keeper release 62 engages keeper support 64 which extends downwardly from keeper support bracket 68. Keeper support bracket 68 includes an actuator extension 70 that is configured to mount onto or otherwise engage plunger 72 of solenoid 74. In the case of a pull type solenoid operating in fail secure mode, actuation of solenoid 74 upon receiving power via leads 56 causes plunger 72 to be pulled into the body of solenoid 74 in the direction generally indicated by arrow 76. As keeper support bracket 68 is engageable with plunger 72 via actuator extension 70, the inward travel of plunger 72 results in a sliding travel of keeper support bracket 68 in direction 76, wherein keeper support bracket 68 may be slidably coupled with a guide 77 that is fixedly positioned relative to body 61. Keeper support 64 is likewise displaced by travel of keeper support bracket 68 such that keeper support 64 is no longer aligned with and operatively coupled to keeper release 62. With additional reference to FIGS. 6 and 7, at this point, any load on keeper 24 (such as an authorized attempt to withdraw a latch from entry chamber 36) operates to pivot keeper 24 about pin portions 44, 46, 50 so that keeper 24 drives keeper release 62 linearly, perpendicular to the axis X and/or toward back wall 28 of housing 22 against biasing member 67. Once any load on keeper 24 is removed (such as after the removal of the door latch), keeper 24 is returned to its locked position by biasing member 52 while keeper release 62 is returned to the extended position via biasing member 67. In this manner, once power to actuating device 74 has been withdrawn, plunger 72 may return to its original position, such as via a plunger return spring 78, to thereby return keeper support bracket 68 and keeper support 64 to their original positions whereby keeper support 64 is again aligned with and operatively coupled to keeper release 62 so as to lock keeper 24.

(29) As further shown in FIG. 5, actuator module 26 may include second keeper release 62a disposed at the opposite end of the module. Second keeper release 62a cooperates with second keeper support 64a of support bracket 68. In accordance with this aspect of the invention, the opposing forces imparted on the keeper when an unauthorized attempt is made to withdraw the latch from the entry chamber are balanced across the length of the keeper and translated evenly through first and second keeper releases 62,62a to the back wall of the housing.

(30) FIG. 8 shows an alternative actuator module 26, including actuator 69 and keeper release 62. Actuator 69 includes actuating device 74 such as a stepper motor, and keeper support bracket/support, 68, 64, respectively. As shown, keeper support 64 has been disengaged from keeper release 62 so as to allow pivoting of keeper 24 (not shown) to drive keeper release 62 rearwardly. To facilitate the sliding translation of keeper support 64, keeper support bracket 68 includes an actuator extension 70 configured to engage with rod 72 on stepper motor 74. Actuation of stepper motor 74 by a voltage having a first polarity causes rotation of shaft 80 so as to advance actuator extension 70 (and keeper support bracket 68 and keeper support 64) in one direction (such as the direction indicated by arrow 76). Supplying a voltage having the opposite polarity then reverses rotation of shaft 80 to advance actuator extension 70 in the opposite direction. A biasing member, such as spring 78, may assist in driving actuator extension 70 in direction 76 toward stepper motor 74.

(31) As further shown in FIG. 8, actuator module 26 may include second keeper release 62a disposed at the opposite end of the module. Second keeper release 62a cooperates with second keeper support 64a of keeper support bracket 68. In accordance with this aspect of the invention, the opposing forces imparted on the keeper when an unauthorized attempt is made to withdraw the latch from the entry chamber are balanced across the length on the keeper and translated evenly through first and second keeper releases 62,62a to the back wall of the housing.

(32) In accordance with an aspect of the present invention, actuator module 26 may be configured to operate stepper motor 74 as a low power actuator. To that end, and with additional reference to FIGS. 9 and 10, actuator module 26 may further include a switching regulator 82, microcontroller 84, a constant-current constant-voltage (CCCV) regulator 86 and one or more super capacitors 88, such as model no. JUMT1474MED, supplied by Nichicon Corporation of Karasumadori Oike-agaru, Nakagyo-ku, Kyoto, 604-0845 Japan. When external power 90, such as a voltage ranging from about 10 VDC to about 30 VDC, is supplied to actuator module 26, on-board microcontroller 84 senses that power has been supplied (at time 92, FIG. 10) and drives the actuating device, such as stepper motor 74, from a first position to a second position using an actuator motor driver integrated circuit 94 (during time period 96, FIG. 10). After the actuator drive operation has completed, microcontroller 84 enables an onboard CCCV regulator 86 to charge on-board super capacitor(s) 88 (during time period 98, FIG. 10). After a fixed period of time microcontroller 84 disables CCCV regulator 86 (at time 100, FIG. 10). Once external power 90 is removed, microcontroller 84 may power the actuating device 74 using energy stored in super capacitor(s) 88. Actuating device 74 is then driven to return to the first position. In this manner, after charging of super capacitor(s) 88 has been completed, the power consumption of actuator module 22 is reduced. As a further benefit, the use of the controllable CCCV regulator allows for the peak current seen at an external supply output to be limited.

(33) As can be noted from the above, actuator module 26 may be selected to operate in either a fail safe mode or a fail secure mode depending on whether the first position has keeper support 64, 64 coupled to keeper release 62, 62 (fail secure) or whether the first position has members 62/64, 62/64 decoupled from one another (fail safe). To ensure that the actuator drive operation completes when a pre-load condition is present, a position sensor 95 may be used to supply the microcontroller with actuator position data. In one embodiment, position sensor 95 may be a contactless linear position Hall sensor in conjunction with a magnet. It should be understood that the position sensor may incorporate any suitable sensor system capable of sensing the actuator drive position, such as, but not limited to, a photo sensor, a pressure sensor, a micro switch, a passive infrared sensor, a radio frequency (RF) sensor, a reed switch, or the like. If microcontroller 84 determines the actuator drive was not successfully completed after receiving actuator position data from position sensor, microcontroller 84 will continue to drive the actuator until the desired position is successfully reached. To conserve power, position sensor 95 may be switched to a power down state when it is not being used.

(34) In accordance with a further aspect of the present invention, the actuating device may be a springless electromagnet actuator having a non-magnetic armature containing a permanent magnet combined with a solenoid body and coils similar to that disclosed within U.S. patent application Ser. No. 13/833,671. When using such a springless electromagnet actuator, microcontroller 84 can use input power 90 to provide a first pulse having a first polarity to drive the armature to the second position. Input voltage 90 may then charge super capacitor(s) 88 through CCCV regulator 86 under microcontroller 84 control as described above. Once input power is removed, super capacitor(s) 88 may then provide the power needed for a second pulse having a second polarity to return the armature to the first position.

(35) While the actuating device has been described as either a solenoid, a stepping motor or a springless electromagnet actuator, it is understood the actuating device in accordance with the invention may include other types of motors, including a DC motor, or other types of powered actuating devices, including piezo electric and shape memory devices.

(36) Turning now to FIGS. 11 and 12, in accordance with an aspect of the present invention, keeper 24 may be configured to include an extendable face portion 54. Face portion 54 may be positionally adjusted to define the width of entry chamber 36 as measured between the outer face of face portion 54 and the inner surface of back wall 28 of housing 22 (such as from width W.sub.1 shown in FIG. 11 to width W.sub.2 shown in FIG. 12), thereby minimizing the gapped clearance between an extended latch and the width of the entry chamber.

(37) In accordance with this aspect, keeper 24 may include a groove 102 adapted to received face portion 54. One or more set screws 104 may be threadably inserted within corresponding threaded apertures 106 within face portion 54. Set screws 104 may be selectively advanced until the desire width is created, i.e., width W.sub.2. Groove 102 may include respective recesses 108 configured to receive a respective set screw 104. A fastener, such as hex screw 110 is then threaded through face portion 54 and into keeper 24 to secure face portion 54 to the keeper. Width W.sub.2 may be selected such there is little movement of the door latch, and subsequently the door, when the latch is locked within strike 20. Reduced movement minimizes unnecessary wear and tear on the latch and the strike, as well as reduces door movement and subsequent noise. In addition, when used in conjunction with a cylindrical-type lockset, and when extendable face portion 54 is adjusted outward and keeper 24 is in its locked position as shown in FIG. 12, surface 111 of extendable face portion 54 may serve as a resting platform for the dead latch of the lockset when the associated latch is received by entry chamber 36. Thus, extendable face portion 54 provides additional assurance that the dead latch remains retracted when the cylindrical lockset is in a locked position, thereby preventing an unauthorized forced retraction of the associated latch to unlock the door. Provision of set screws 104 enables fine incremental control of the placement of face portion 54 over a wide range of entry chamber widths without requiring multiple shim members which are presently employed within the art. Further, in the prior art, a shim pack was provided with the strike product so that, at the time of installation, the width of the entry chamber could be varied as needed, by the selection and installation of the appropriate sized shim to the face of the keeper. However, over time, through usage of the door, the width of the entry chamber can be expected to change, requiring a different sized shim to take up the gapped clearance. Often, the shim pack would be discarded after original strike installation so that a later re-adjustment of the gapped clearance could not be made. In accordance with the invention, the means for re-adjusting the gapped clearance remains with the strike so that re-adjustments can be conveniently made at any time after original installation.

(38) FIGS. 13-15 show additional features that may be included with strike 20. For instance, as shown in FIG. 13, strike 20 may be configured to house one or more latch bolt monitors (LBM) 112, which may also be interchangeable across a multitude of electric strike models. LBM 112 may be secured to housing 22 of strike 20 by way of screws or other fasteners inserted through holes 114 defined within back wall 28 of housing 22 (see FIG. 2). Back wall 28 may also include apertures 116 through which wires associated with LBM 112 may be passed for proper operation of LBM 112.

(39) FIG. 14 shows an optional trim plate 118 that may be placed around keeper 24 when strike 20 is mounted to the door frame. Trim plate 118 may be mounted directly to frame 120 or to housing 22. Trim plate 118 may be used to improve aesthetics or may be used to cover any small gaps or cracks between strike 20 and the underlying frame 120.

(40) As seen in both FIGS. 13 and 14, strike 20 may include a strike plate 38 configured to rest against flanges 32A and 34A of respective side walls 32, 34 of housing 22. Strike plate 38 may be mounted to frame 120 via screws 122. As shown in FIG. 15, strike 20 may be configured to receive one of any number of various strike plates, such as anyone of strike plates 38A-38E, depending on the type of latch system mounted onto the door, including a cylindrical-type lockset (see FIG. 38C, for example).

(41) As shown in FIGS. 16 and 17, strike 20 may further include an open-sided deadbolt bracket 124 comprising, for example, a rear wall 128, a bracket side wall 131, and a front wall 134, which is proportioned to receive a deadbolt (not shown), wherein a distal ends 133, 135 of bracket 124 may abut side wall 34 of housing 22, and bracket 124 and side wall 34 conjunctively define a walled deadbolt receiving chamber 123 having a vertical length 129. In the prior art, the end of the deadbolt bracket is not open but, instead, includes an end wall that is generally the thickness 125 of the bracket and abuts with side wall 34 of housing 22 when the deadbolt bracket is assembled into housing 22. Thus, in the prior art, the vertical length the deadbolt receiving chamber is reduced by the added thickness 125 of the bracket abutting side wall 34. In some cases, the reduced vertical length of the receiving chamber of a prior art deadbolt bracket interferes with an extended deadbolt, thereby preventing full engagement of the deadbolt in the strike, or preventing compatibility of the strike with some dead bolts.

(42) Deadbolt bracket 124 in accordance with the invention may be mounted within housing 22 by a pair of screws 126 passing through holes 114 define within back wall 28 of the housing and threaded into corresponding holes 127 defined in rear wall 128 of deadbolt bracket 124. Side wall 34 may include a slot 130 configured to receive a tab 132 extending from an end 135 of front wall 134 of deadbolt bracket 124. In this manner, deadbolt bracket 124 is rigidly secured along two faces of housing 22 such that any load placed on the deadbolt latch (not shown) impacts the deadbolt bracket and housing 22 and not keeper 24.

(43) Thus, the deadbolt receiving chamber 123 of open-sided deadbolt bracket 124 provides more room and greater vertical clearance for the associated deadbolt and, if keeper 24 were to be compromised or otherwise fail, the door would remain secure due to the deadbolt securely residing within receiving chamber 123 of deadbolt bracket 124. In addition, deadbolt bracket 124 may also be made to be interchangeable across a multitude of electric strike models. While deadbolt bracket is shown as being U-shaped in FIGS. 16 and 17, it should be understood that deadbolt bracket is not necessarily limited to this specific shape. Further, in another aspect, the open ended portion of deadbolt bracket 124 could also be oriented so that it abuts back wall 28 of housing 22 instead of side wall 34 of housing 22.

(44) FIGS. 18 and 19 show a typical mortise lockset 140 (FIG. 19) and a typical electric strike 160 (FIG. 18) in the prior art. Mortise lockset 140 includes latch 142 and dead latch 144 linearly spaced-apart from latch 142. Dead latch 144 is reciprocally moveable between an enabling position (extended, as shown) that permits movement of the latch from its extended engaged position (as shown) to a released position, and a disabling position that prohibits movement of the latch from its engaged position to its released position. It is well known in the art that, as a door is moved to a closed position and dead latch 144 begins initial contact with an associated strike plate, latch 142 (FIG. 18) must begin to move from its extended position and toward its release position before dead latch 144 moves away from its enabling (extended) position. If the dead latch is caused to move away from its extended position first, it will prohibit movement of the latch toward its released position, thereby blocking the latch from properly entering strike cavity 168 (and preventing the door from latching).

(45) Referring to FIG. 18, prior art electric strike 160 includes a housing 162 having side walls 32, 34 and a prior art deadbolt receiving chamber 123 for receiving an extendable dead bolt (not shown). Prior art electric strike 160 also includes a pivotable keeper 164 (shown in a locked position), having an edge 166 running the length of the keeper, wherein the entire length of edge 166 resides between side walls 32, 34. Also included in electric strike 160 is receiving cavity 168 for receiving latch 142 when the door is closed. As can be seen, with a proper door to door frame alignment, and therefore a proper vertical alignment of the latch and dead latch relative to cavity 168, both the latch and dead latch will make contact with edge 166 and will cause a proper sequencing of the retraction of the latch followed by the retraction of the dead latch. However, with an improper alignment, such as might be caused by a sagging door, the dead latch 144 may not make contact with edge 166 and may instead contact corner 170 of side wall 34 before latch 142 makes contact with edge 166. As a result, dead latch 144 is prohibited from moving toward its released position, thereby blocking the latch from entering cavity 168 and preventing the door from latching.

(46) Referring now again to FIGS. 13, 16 and 17, in another aspect of the invention, keeper 24 may include a ramp element 23 and a keeper base 27, wherein ramp element 23 may include a contact surface 33 that is contactable by a spring latch and/or dead latch of a lockset as the door is moved to a closed position. In this aspect, with additional reference to FIG. 3, contact surface 33 may extend a distance (A) beyond a front profile 41 of housing 22 when keeper 24 is in the locked position to prevent the spring latch and/or dead latch from contacting housing 22 or frame 120 as the door is moved to the closed position. For example, contact surface 33 may extend distance (A) beyond a front edge 43 of at least one of side walls 32, 34 when keeper 24 is in the locked position to prevent the spring latch and/or dead latch from contacting housing 22 or frame 120 as the door is moved to the closed position. Further, at least a portion of a profile 45 of contact surface 33 may be configured to match at least a portion of front profile 41 of housing 22, for example, the profile of front edge 43 of at least one of side walls 32, 34. While profile 45 of contact surface 33 is shown as being rounded, it should be understood that other profiles are also contemplated herein.

(47) In yet another aspect of the invention, keeper 24 may optionally include at least one extension flange 29 that projects from an end of ramp element 23 that extend beyond at least one of side edges 25 of keeper base 27. When keeper 24 is in a locked position ((FIG. 13), extension flange 29 covers front edge 43 of a respective side wall 32, 34 so that a misaligned spring latch or dead latch will contact ramp element 23 instead of front edge 43, such as, for example, a corner of housing 22. To that extent, front edge 43 of side walls 32, 34 may be contoured to accept the underside of extension flange 29 of ramp element 23 so that a top portion 37 of contact surface 33 of keeper 24 may be essentially flush with a top surface 39 of strike plate 38 mounted to strike (FIG. 3).

(48) Several aspects of this invention have been disclosed as being desirably interchangeable across a multiple of electric strike models, thereby demonstrating the versatility of the disclosed electric strike and its ability to meet various strike needs. In another aspect of the invention, a strike lip extension can be used with the disclosed electric strike in order to make the electric strike adaptable to fit a variety of door frames that might exist in the field. Referring to FIGS. 20A, 20B and 21, U-shaped lip extension 180 may be used in conjunction with actuator controlled electric strike 20, shown in FIG. 1, when an existing door frame cut-out is wider than the a standard cut-out width.

(49) Referring to FIG. 20A, electric strike 20 and strike plate 38A are shown mounted in cut out 119 of a standard width door frame 120 designed to receive a standard 1% inch thick door. As can be seen in this figure, keeper 24 is in its locked position and rounded edge 166 of keeper 24 is in close alignment with edge 121 of the door frame. Referring now to FIG. 20B, the same electric strike 20 and strike plate 38A are mounted in cut out 119 of a door frame 120 having surface 182 of door frame 120 wider that the width of surface 182 shown in FIG. 20A. In conjunction with the wider door frame and wider cut out shown in FIG. 20B, edge 184 of strike plate 38A is disposed a greater distance 186 from surface 121 of the door frame than the edge 184 of strike plate 38A is disposed from surface 121 in FIG. 20A (see dimension 186). To close out the gap 190 between electric strike 20 and frame surface 121 caused by the larger cut out 119, lip extension 180 is provided.

(50) Referring now to FIG. 21, housing 20 of strike 22 includes a notch 192 that may run the entire length of housing 20. U-shaped lip extension 180 includes bottom panel 181 and side wings 183 extending from opposite ends of bottom panel 181 and formed at right angles to bottom panel 181 to form the U-shape. Rib 193, which may have a square or rectangular cross-section, is disposed on the bottom panel 181 and extends between side wings 183. Notches 185 are formed on the leading corners of side wings 183. The notches 185, rib 193 and length of side wings 183 are configured so that, when lip extension 180 is fitted and mounted to strike 22, the inside surface of bottom panel 181 fits closely and is adjacent to the bottom surface 21 of housing 22, notches 185 fit closely and are adjacent to strike plate 38A and housing flanges 32A, 34A, and rib 193 fits closely and adjacent to notch 192 of housing 20. Alignment holes 187 (2 of 3 shown), formed within notch 192, receive mating pegs (not shown) formed in a leading edge of bottom panel 181 to aid in further alignment of the lip extension to the strike housing. Fasteners 191, such as screws, are used to secure the lip extension to the housing. As can be seen in FIG. 20B, when electric strike 20 is then secured to door frame 120, a neat package is created whereby gap 190 is entirely concealed by U-shaped extension 180.

(51) In accordance with a further aspect of the present invention, a method for ocking or unlocking a door having an actuator-controlled electric strike for operating in conjunction with a latch of a lockset is included, wherein the latch has an engaged position so as to secure a door in a closed state and a released position, and wherein the strike includes a housing including a back wall and opposing side walls and defining an entry chamber therein; a keeper rotatably disposed in the entry chamber about an axis for rotation between a locked position and a unlocked position; and an actuator module, including a keeper release configured to engage the keeper, and an actuator selectively movable between a first actuator position and a second actuator position, wherein when the actuator is in one of the first or second actuator positions the keeper release is coupled to the keeper and the keeper is secured in the locked position, and wherein when the actuator is selectively moved to the other of the first or second actuator positions the keeper release is decoupled from the keeper and the keeper is rotatable to the unlocked position, the method for unlatching comprising the steps of providing an input voltage to drive the actuator from a first position to a second position; after driving the actuator, using the input voltage to charge a capacitor; removing the input voltage; and providing a return voltage via the capacitor to drive the actuator from the second position to the first position.

(52) The method may further include the actuator module having a microcontroller wherein the microcontroller senses an input polarity of the input voltage and drives the actuator from the first actuator position to the second actuator position. Further, the capacitor may be a super capacitor wherein the actuator module further includes a constant-current, constant-voltage (CCCV) charger, the microcontroller controlling the CCCV charger to charge the super capacitor after the actuator has been driven to the second actuator position, the super capacitor then providing a second voltage having a polarity opposite the input polarity to drive the actuator from the second actuator position to the first actuator position.

(53) A method for changing an actuator module of a strike assembly is provided wherein said actuator module is a first actuating module including an actuator and a keeper release, comprising the steps of:

(54) 1) providing said strike assembly having said first actuator module disposed in a strike assembly housing wherein said housing includes a movable keeper, wherein the first actuator module includes a first actuating device comprising one of a solenoid or a motor, and further comprising a first keeper release operatively engageable with said movable keeper to selectively release said keeper from a locked position to a released position;

(55) 2) allowing for the removal of said first removable actuator module from said housing; and

(56) 3) allowing for the installation of a second removable actuator module in place of said first removable actuator module wherein the second actuator module includes a second actuating device comprising one of a solenoid or a motor, and further comprising a second keeper release operatively engageable with said movable keeper to selectively release said keeper from a locked position to a released position.

(57) While the invention has been described by reference to various specific embodiments, it should be understood that numerous changes may be made within the spirit and scope of the inventive concepts described. Accordingly, it is intended that the invention not be limited to the described embodiments, but will have full scope defined by the language of the following claims.