Classifications

• • E—FIXED CONSTRUCTIONS
  • E05—LOCKS; KEYS; WINDOW OR DOOR FITTINGS; SAFES
  • E05B—LOCKS; ACCESSORIES THEREFOR; HANDCUFFS
  • E05B15/00—Other details of locks; Parts for engagement by bolts of fastening devices
  • E05B15/02—Striking-plates; Keepers; Bolt staples; Escutcheons
  • E05B15/0205—Striking-plates, keepers, staples
  • E05B15/022—Striking-plates, keepers, staples movable, resilient or yieldable
• • E—FIXED CONSTRUCTIONS
  • E05—LOCKS; KEYS; WINDOW OR DOOR FITTINGS; SAFES
  • E05B—LOCKS; ACCESSORIES THEREFOR; HANDCUFFS
  • E05B47/00—Operating or controlling locks or other fastening devices by electric or magnetic means
  • E05B47/0046—Electric or magnetic means in the striker or on the frame; Operating or controlling the striker plate
  • E05B47/0047—Striker rotating about an axis parallel to the wing edge
• • E—FIXED CONSTRUCTIONS
  • E05—LOCKS; KEYS; WINDOW OR DOOR FITTINGS; SAFES
  • E05B—LOCKS; ACCESSORIES THEREFOR; HANDCUFFS
  • E05B17/00—Accessories in connection with locks
  • E05B17/22—Means for operating or controlling lock or fastening device accessories, i.e. other than the fastening members, e.g. switches, indicators
• • E—FIXED CONSTRUCTIONS
  • E05—LOCKS; KEYS; WINDOW OR DOOR FITTINGS; SAFES
  • E05B—LOCKS; ACCESSORIES THEREFOR; HANDCUFFS
  • E05B47/00—Operating or controlling locks or other fastening devices by electric or magnetic means
  • E05B47/0001—Operating or controlling locks or other fastening devices by electric or magnetic means with electric actuators; Constructional features thereof
  • E05B47/0012—Operating or controlling locks or other fastening devices by electric or magnetic means with electric actuators; Constructional features thereof with rotary electromotors
• • E—FIXED CONSTRUCTIONS
  • E05—LOCKS; KEYS; WINDOW OR DOOR FITTINGS; SAFES
  • E05B—LOCKS; ACCESSORIES THEREFOR; HANDCUFFS
  • E05B47/00—Operating or controlling locks or other fastening devices by electric or magnetic means
  • E05B47/0001—Operating or controlling locks or other fastening devices by electric or magnetic means with electric actuators; Constructional features thereof
  • E05B2047/0014—Constructional features of actuators or power transmissions therefor
  • E05B2047/0018—Details of actuator transmissions
  • E05B2047/0023—Nuts or nut-like elements moving along a driven threaded axle
• • E—FIXED CONSTRUCTIONS
  • E05—LOCKS; KEYS; WINDOW OR DOOR FITTINGS; SAFES
  • E05B—LOCKS; ACCESSORIES THEREFOR; HANDCUFFS
  • E05B47/00—Operating or controlling locks or other fastening devices by electric or magnetic means
  • E05B2047/0048—Circuits, feeding, monitoring
  • E05B2047/0067—Monitoring
• • E—FIXED CONSTRUCTIONS
  • E05—LOCKS; KEYS; WINDOW OR DOOR FITTINGS; SAFES
  • E05B—LOCKS; ACCESSORIES THEREFOR; HANDCUFFS
  • E05B47/00—Operating or controlling locks or other fastening devices by electric or magnetic means
  • E05B2047/0048—Circuits, feeding, monitoring
  • E05B2047/0067—Monitoring
  • E05B2047/0069—Monitoring bolt position

Definitions

• This invention relates to an electric strike system for use with a door latch assembly. More specifically the electric strike provides for monitoring of the keeper.
• An electric strike includes a strike or keeper that is movable relative to a housing.
• the housing is normally mounted in a door frame, and the electric strike is operable for releasably retaining a latch bolt assembly installed on the door mounted to the frame.
• the electric strike is in a locked condition the door is prevented from moving from the closed condition, and when in the unlocked condition the door is movable from the closed position without operating the latch bolt assembly.
• the electric strike is programmed with a specific time delay of say five seconds before returning to the locked condition, so as to allow the door to return to the closed position. It can be problematic if the door takes longer than the specified time to return to the closed position.
• the electric strike may be connected to some form of electronic security reader mounted proximate the door frame so as to limit access through the door to only those people carrying appropriate security swipe tags or cards.
• the use of a swipe tag in combination with an electric strike is an attractive egress security option for relatively high traffic areas such as commercial office buildings, multi dwelling accommodation and public buildings such as libraries and hospitals.
• the use of the electric strike in a public environment will expose it to a ranger of users.
• One problem that the applicant is aware of is when the keeper is held in an open condition for an extended period of time, and the issues that this can cause with the electric strike trying to return to the locked condition. Depending upon the locking mechanism within the electric strike this can cause problems ranging from damage to the locking mechanism, through to the keeper being "locked" in an open condition.
• An electric strike includes a powered actuator that requires power for adjusting the condition between locked and unlocked.
• a powered actuator is a solenoid which has a plunger that moves relative to a housing in response to power being supplied, and generally with a spring to return the plunger to its original position without power.
• Another form of powered actuator is a motor that rotates a drive shaft, which requires power to both lock and unlock the electric strike.
• the spring in the solenoid provides is in a power failure event the plunger can still return to its original position. Accordingly the solenoid can be arranged so that in a power failure event the electric strike operates in a fail-safe mode or a fail secure mode which corresponds to the electric strike adopting an unlocked and locked condition respectively.
• the electric strike system preferably includes a power storage device within the housing for providing power at least to the controller.
• the power storage device may take any form however its preferred form is super capacitor, as this allows for a relatively quick discharge and recharge over numerous cycles. Alternatively the power storage device may take the form of a rechargeable battery.
• the controller is preferably mounted within the housing, however it may be installed elsewhere within the electric strike system. This could include mounting the controller in the security reader mounted proximate the door frame. Where the controller is mounted within the housing, and the electric strike system preferably includes electric terminals for connecting the controller to a main power source external to the housing.
• the terminals may include wires with a plug for a socket arrangement to plug into mains power. It is further preferred that the power storage device is mounted on the controller as this simplifies the assembly of the electric strike, however the power storage device may be located elsewhere within the housing.
• PCB Printed Circuit Board
• the electric strike system be capable of accommodating a power failure event, and in particular the controller be operable in a fail-safe mode whereby in the event of the power failure event the power storage device provides power to the controller so as to adjust the condition of the detent to the release condition, or in a fail secure mode whereby in the event of the power failure event the power storage device provides power to the controller so as to adjust the condition of the detent to the locked condition provided the keeper is in the closed position.
• the adjustment between fail safe and fail secure is relatively simple and may include a switch which is adjustable from outside the housing for adjusting operation of the controller between the fail-safe mode and the fail-secure mode. The switch may be operable at a front face of the housing, as this provides the advantage of the operation of the controller being adjustable when the electric strike is mounted.
• the keeper sensor may take any suitable form and one form includes a hall sensor while the keeper includes a magnet which is sensed by the hall sensor when the keeper is in the closed position. This provides the advantage of the sensor sensing the position of the keeper without requiring physical contact. Another alternative is for the sensor to take the form of a reed switch which would interact with the magnet on the keeper, or a micro switch which may physically interact with the keeper itself. It is preferred that the keeper sensor is mounted to the controller, as this simplifies the assembly process of the electric strike. Alternatively the sensor may be located elsewhere in the housing.
• the electric strike system may include a detent sensor that senses the condition of the detent, and the controller monitors signals received from the detent sensor. Whilst the controller may alternatively include a memory function to remember where the detent should be on the basis of previous instructions, it is preferred that sensors be included to actually sense the position of the detent relative to the keeper.
• the detent sensor may take any form and one form may include one, or a pair, of hall sensors and the keeper includes a magnet which is sensed by the either hall sensor when the detent is in either locked condition or the released condition. This provides the advantage of the sensor sensing the position of the detent without requiring physical contact.
• the senor may take the form of a reed switch which would interact with the magnet on the detent, or a micro switch which may physically interact with the detent itself. It is preferred that the detent sensor is mounted to the controller, as this simplifies the assembly process of the electric strike. Alternatively the sensor may be located elsewhere in the housing.
• the powered actuator may take any form however it is preferred that it includes an electric motor and a drive shaft that rotates about an actuation axis when energised.
• the use of an electric motor has the advantage over a solenoid as it can be capable of producing reasonably high torque.
• the controller is preferably adjustable in supplying power to the electric motor so as to adjust between operating in a forward mode and a reverse mode so as to rotate the drive shaft in a clockwise and anti-clockwise direction.
• the detent includes a threaded bore and drive shaft includes a threaded portion that is located within the threaded bore of the detent. The threaded bore of the detent and the threaded portion of the drive shaft interact so that rotation of the shaft causes movement of the detent in the direction of the actuation axis.
• an electric strike system including a security reader for reading a swipe tag.
• Figure 1 is a cross-sectional view of an installed electric strike system including an electric strike assembly with a security reader in a diagrammatic form.
• Figure 2 is an isometric view of a preferred embodiment of the electric strike assembly with a keeper in the closed position.
• Figure 3 is an isometric view of a strike assembly from Figure 2 with the keeper in the open position.
• Figure 4 is an isometric view of a preferred embodiment of the electric strike assembly in an exploded form, with a rear cover of the housing removed.
• Figure 5 is an isometric view of a preferred embodiment of the electric strike assembly with the rear cover removed to reveal the keeper in a closed position and the detent in a release condition.
• Figure 6 is an isometric view of the electric strike from Figure 5 with the detent in a locked condition.
• Figure 7 is a partial isometric view with the keeper in a closed position and the detent in a release condition.
• Figure 8 is an isometric view of the electric strike assembly from Figure 7 with the keeper moved to the open position.
• Figure 9 is an isometric view of the electric strike assembly from Figure 7 with the detent adjusted to the locked condition.
• Figure 1 shows, in very diagrammatic form an electric strike assembly 1 mounted to an edge of a door frame 2.
• a latch assembly 3 including a latch bolt 4 is illustrated as mounted to an edge on an adjacent door 5.
• the electric strike assembly includes a keeper 6 which is shown in Figure 1 in a closed position. When the keeper 6 is held in the closed position it retains the bolt 4 and therefore retains the door 5 from being removed relative to the door frame 2.
• a handle (not shown) may be included at least on the outside of the door 5 to facilitate moving the door 5 relative to the frame 2. It ought to be noted however that the handle is not operably connected to the latch bolt 4 to cause any movement thereof.
• Figure 1 also illustrates electric terminals connecting the electric strike assembly 1 to a power source V, and a security reader 38 connected to the electric strike assembly 1 for reading swipe tags (not shown) or the like.
• the electric strike system includes the combination of the electric strike assembly (1 ), electric terminals and a security reader (38).
• FIG 2 illustrates the electric strike assembly 1 having a housing 8.
• the housing 8 is provided with apertures 9 on the face 10 of the housing 8 to enable the housing 8 to be attached to the door frame 2 (see Figure 1 ) by fasteners such as screws (not shown).
• the keeper 6 is mounted to the housing 8 for movement relative thereto.
• Figure 3 illustrates the keeper 6 having being moved from the closed position shown in Figure 2. This is achieved by a user opening the door 5 so as to pivot the keeper 6 relative to the housing 8.
• the keeper 6 is returned to the closed position by the urging of a spring 1 1 located around a pivot axis of the keeper 6 (see Figure 3).
• Figure 4 illustrates the electric strike 1 in an exploded view with a rear cover 12 removed from a base 13 of the housing 8.
• the base 13 illustrated includes a pair of spaced mounts 14, 15 formed therewith on which the keeper 6 is mounted.
• the mounting arrangement is one that permits the keeper 6 to pivot relative to the base 13 as was explained with reference to Figures 2 and 3.
• the electric strike 1 includes a powered actuator 16 which may take any form.
• Figure 4 illustrates one preferred form of powered actuator 16 including an electric motor 17 and a drive shaft 18.
• the electric motor 17 includes a housing 19 with an output spindle 20 that is rotatable about an actuation axis X-X upon power being supplied to the electric motor 17.
• the motor 17 may take any form however a preferred form is a 12 volt motor.
• the output spindle 20 is preferably shaped so as to interact with a proximal end 21 of the drive shaft 18.
• Figure 4 illustrates the proximal end 21 of the drive shaft 18 being flared and includes a bore (not shown) which is shaped to complement the external surface of the output spindle 20 so as to provide a driving connection between the output spindle 20 and the proximal end 21 of the drive shaft 18.
• the actuator 16 be capable of operating in a forward mode and a reverse mode so as to rotate the drive shaft 18 in a clockwise and anti-clockwise direction respectively.
• This may be achieved by any suitable arrangement, and the preferred arrangement illustrated involves utilising a motor 17 that allows for reverse polarity of the power supplied thereto so as to adjust rotation of the output spindle 20 between clockwise and anticlockwise.
• An alternate, not illustrated, may include a gearbox acting between the output spindle 20 of the electric motor 17 and the drive shaft 18 so as to permit adjustment between rotating the drive shaft 18 in a clockwise and anticlockwise direction.
• the electric strike 1 includes a detent 22 that is movable relative to the housing 8 between a lock condition and a release condition.
• the detent 22 illustrated is a unitary member having a driven portion 23 formed with a threaded bore 24.
• the threaded bore interacts with a threaded portion 25of the drive shaft 18 so that rotation of the drive shaft 18 in the clockwise or anti-clockwise direction results in movement of the detent 22 relative to the housing 8.
• the detent also includes an abutment 26 which interacts with an arm 27 of the keeper 6 in a manner that will be described in greater detail with reference to Figures 7 to 9.
• the detent 22 is also formed with a slot 28 between the abutment 26 and driven portion 23 which can accommodate the arm 27 of the keeper 6 when the detent 22 is in the release condition.
• the interaction of the slot 28 with the arm 27 of the keeper 6 will be described in greater detail with reference to Figures 7 to 9.
• the electric strike 1 also includes a controller 29 which is illustrated in Figure 4 mounted within the housing 8 to control supply of power to the powered actuator 16.
• the controller 29 may be located elsewhere, including for example the security reader 38 (see Figure 1 ).
• Figure 4 illustrates a preferred embodiment of the controller 2 in the form including a printed circuit board 30 (PCB) which is connected by wires (not shown) to the electric motor 17 when the electric strike 1 1 is assembled.
• the PCB 30 includes electronic circuitry (not shown) in order to control a supply of power.
• the electric strike 1 also includes a keeper sensor 31 which senses the position of the keeper 6.
• a preferred form of keeper sensor 31 illustrated in Figure 4 is in the form of a hall sensor mounted to the PCB 30 which sensors a magnetic field produced by a magnet 32 located in the arm 27 of the keeper 6. This interaction will be described in greater detail with reference to Figures 7 to 9.
• the electric strike include a detent sensor 33, 34 for sensing the condition of the detent 22.
• Figure 4 illustrates a pair of hall sensors 32, 34 mounted to the PCB 30 which monitor a magnetic signal produced by a magnet 35 mounted to the detent 22.
• the electric strike 1 include electric terminals in the form of wires (not shown) for wiring the controller 29 to a mains power source. It is also preferred that the electric strike 1 include a power storage device 36 within the housing 8 for providing power to the controller 29.
• the preferred form of power storage device 36 is a super capacitor and it is further preferred that the super capacitor be mounted on the PCB 30 providing backup power for the controller 29 in a power failure event from the mains power source.
• any power storage device 36 including a super capacitor, will have limited power to supply to the controller 29 in a power failure event from the mains power source. Accordingly it is preferred that the controller 29 be adjustable to operate in either a failsafe mode or fail secure mode in a power failure event from the mains power source.
• the adjustment may be achieved by any suitable arrangement and in the embodiment illustrated includes a switch 37 (see Figure 2) which is adjustable from outside the housing 8 for adjusting operation of the controller 29.
• the switch 37 may be located anywhere on the housing 8, including at the front face 10 of the housing 8 to permit adjustment of the controller 29 whilst the electric strike 1 is installed.
• the switch 37 may be covered as illustrated in Figure 2 to avoid tampering.
• the power storage device 36 When the controller 29 is operating in a failsafe mode, in the event of a power failure event, the power storage device 36 provides power to the controller 29 so as to adjust the condition of the detent 22 to the release condition. In contrast when operating in a fail secure mode, in the event of the power failure event the power storage device 36 provides power to the controller 29 to adjust the condition of the detent 22 to the lock condition, provided the keeper 6 is in the closed position.
• the controller 29 of the electric strike 1 is programmed to monitor signals received from the keeper sensor 31 so as to prevent supplying power to the powered actuator 16 while the keeper 6 is in the open position.
• FIG 5 which illustrates detent 22 in the release condition and the keeper 6 in the closed position.
• Keeper sensor 31 is monitoring the magnet in the keeper arm 27 and sending a signal to the controller 29 to indicate the keeper is in the closed position.
• the controller 29 can supply power either from the mains power source or from power storage device 36 (see Figure 4) to the electric motor 17 so as to rotate the drive shaft 18. Rotation of the drive shaft 18 will cause the detent 22 to move from the released condition illustrated in Figure 5 to a locked condition as illustrated in Figure 6.
• FIG 7 illustrates the detent 22 in the released condition whereby the arm 27 on the keeper 6 aligns with slot formed in the detent 22.
• the keeper sensor 31 (see Figure 4) will sense that the keeper 6 is no longer in the closed position and send a signal to the controller 29 so as to prevent operation of the detent 22 to move it from released condition as illustrated in Figure 8.
• the controller 29 can supply power to the electric motor 17 in a reverse polarity rotating the drive shaft 18 in the opposite direction to return the detent 22 to the locked condition.

Landscapes

• Lock And Its Accessories (AREA)
• Details Of Connecting Devices For Male And Female Coupling (AREA)

Priority Applications (6)

Applications Claiming Priority (2)

Publications (1)

Family

ID=57883846

Family Applications (1)

Country Status (7)

Cited By (4)

Families Citing this family (1)

Citations (3)

Family Cites Families (4)

• 2016
  • 2016-07-28 WO PCT/AU2016/050675 patent/WO2017015718A1/en active Application Filing
  • 2016-07-28 AU AU2016301111A patent/AU2016301111B2/en active Active
  • 2016-07-28 GB GB1802964.5A patent/GB2556790B/en not_active Expired - Fee Related
  • 2016-07-28 CN CN201680050514.5A patent/CN107923196B/zh active Active
  • 2016-07-28 NZ NZ739558A patent/NZ739558A/en unknown
  • 2016-07-28 DE DE112016003432.6T patent/DE112016003432T5/de not_active Withdrawn
  • 2016-07-28 KR KR1020187006092A patent/KR20180034648A/ko unknown

Patent Citations (3)

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