The invention set forth in the appended claims relates generally to systems and apparatuses for controlling access to a building, including, without limitation, electromechanical strike devices.
Electronic access control devices, including electromechanical strikes, are in widespread use in commercial buildings and allow access to buildings or other areas to be restricted. For example, a door with an electromechanical strike generally remains locked from the outside, unless activated. If activated, an electromechanical strike can release a latch in a door, thereby unlocking the door. An electromechanical strike can be configured to automatically return to a locked position when a door is closed. A door with an electromechanical strike can additionally be configured to be opened from the inside by pressing a panic bar or other manual release device.
While the benefits of electromechanical strikes are widely known, improvements to such devices can significantly reduce cost of operation, including power and maintenance requirements.
New and useful systems and apparatuses for controlling access to a building are set forth in the appended claims. Illustrative embodiments are also provided to enable a person skilled in the art to make and use the claimed subject matter.
For example, some embodiments may comprise a low-voltage, direct current apparatus for controlling a door, gate, or other access point to a structure or enclosed area. In some embodiments, the apparatus may comprise a housing, a face plate coupled to the housing, a strike plate coupled to the housing, and a keeper disposed between the face plate and the strike plate. The keeper may be rotatably coupled to the housing and may have a cavity configured to receive a latch coupled to a door or other access point. A motor may be disposed within the housing, and a shaft may be coupled to the motor. An actuator arm may be coupled to the shaft. The motor may be operable to rotate the shaft to move the actuator arm from a locked position in which the actuator arm prevents movement of the keeper to an unlocked position in which the actuator arm allows movement of the keeper. The motor is operable on direct current at twelve volts or less.
In more particular examples, a locking arm may be rotatably coupled to the housing, and the locking arm configured to prevent movement of the keeper in the locked position and to allow movement of the keeper in the unlocked position. In some embodiments, a blocking arm may be rotatably coupled to the housing, and the locking arm can be configured to prevent movement of the blocking arm in the locked position and to allow movement of the blocking arm in the unlocked position. The blocking arm is configured to prevent rotation of the keeper in the locked position.
In yet other examples, some embodiments may comprise a lead screw mounted to the shaft, a nut coupled to the lead screw and to a proximal end of the actuator arm, a locking arm having a first end rotatably coupled to the housing and a second end coupled to the actuator arm, and a blocking arm rotatably coupled to the housing. Rotating the shaft can rotate the lead screw, thereby moving the nut and the actuator arm to move the locking arm. The locking arm can be configured to prevent movement of the blocking arm in the locked position and to allow movement of the blocking arm in the unlocked position, and the blocking arm can be configured to prevent rotation of the keeper in the locked position.
In other examples, some embodiments may comprise a housing and a keeper rotatably coupled to the housing. The keeper may have a cavity configured to receive a latch. A motor may be disposed within the housing, a shaft may be coupled to the motor, an actuator arm may be coupled to the shaft, and a locking arm may be coupled to the actuator arm. The motor can be operated to rotate the shaft, moving the actuator arm from a locked position to an unlocked position. The locking arm can be configured to prevent movement of the keeper in the locked position and can be configured to allow movement of the keeper in the unlocked position. In some embodiments, a blocking arm can be rotatably coupled to the housing. The locking arm can be configured to prevent movement of the blocking arm in the locked position and to allow movement of the blocking arm in the unlocked position. The blocking arm can be configured to prevent rotation of the keeper in the locked position.
In yet other examples, an access control device may comprise a motor and a locking arm coupled to the motor. The motor can be operated on direct current at twelve volts or less to move the locking arm from a locked position to an unlocked position. Some embodiments may additionally comprise a keeper configured to receive a latch, and in the locked position, the locking arm can prevent rotation of the keeper. In the unlocked position, the locking arm allows rotation of the keeper to release the latch.
Additionally, or alternatively, some embodiments may further comprise an access control unit coupled to the motor and configured to determine if access should be allowed. If the access control unit determines that access should be allowed, the access control unit can deliver power to the motor.
Features, elements, and aspects described in the context of some embodiments may also be omitted, combined, or replaced by alternative features. Other features, objectives, advantages, and a preferred mode of making and using the claimed subject matter are described in greater detail below with reference to the accompanying drawings of illustrative embodiments.
The accompanying drawings illustrate some objectives, advantages, and a preferred mode of making and using some embodiments of the claimed subject matter. Like reference numbers represent like parts in the examples.
The following description of example embodiments provides information that enables a person skilled in the art to make and use the subject matter set forth in the appended claims, but it may omit certain details already well known in the art. The following detailed description is, therefore, to be taken as illustrative and not limiting.
The system 100 may additionally have an access control unit 125 and a conductor 130. In some embodiments, the access control unit 125 may be configured to read or receive a signal from an identification unit (not shown), such as a radio frequency identifier (RFID), a magnetic stripe card, keypad, biometric scanner, or Bluetooth device. The access control unit 125 may be powered by relatively low-voltage, direct current source, such as a battery having a voltage in a range of about three (3) volts to about twelve (12) volts, and preferably less than six (6) volts. The conductor 130 may electrically couple the access control unit 125 to the strike 120.
The locking arm 405 may be rotatably coupled to the housing 220. For example, the locking arm 405 may be coupled to a hinge or pin, such as a pin 415, which may be coupled to the housing 220, as illustrated in the example of
The blocking arm 410 may also be rotatably coupled to the housing 220. For example, the blocking arm 410 may be coupled to a pin 425, which can be coupled to the housing 220, as illustrated in the example of
In the locked position of
The motor 610 may be a direct current motor in some embodiments and can be operated at a range of about three (3) volts to about twelve (12) volts. For example, a micro-gear motor capable of operating at 300 revolutions per minute and three (3) volts may be particularly useful in some embodiments. As shown in the example of
The motor 610 may be coupled to the housing 220 in some embodiments to constrain axial and lateral movement. In the example of
The lead screw 620 may be coupled to the shaft 615, and the nut 625 may be threaded onto the lead screw 620. Rotation of the nut 625 can be constrained or prevented by a suitable constraint mechanism. For example, the nut 625 may have flat surfaces that can be retained by the housing 220 or restraining plates coupled to the housing 220. In the example of
The actuator arm 630 may be coupled to the nut 625 and to the locking arm 405. For example, in some embodiments, a first end of the actuator arm 630 may be coupled to the screw 635, which is coupled to the nut 625, and a second end of the actuator arm 630 may be coupled to the locking arm 405. As shown in the example of
For example, if the access control unit 125 determines that access should be allowed, the access control unit 125 can deliver power to the motor 610 through the conductors 640, which can cause the motor 610 to rotate the shaft 615 in a first direction. The rotation of the shaft 615 in this first direction can rotate the lead screw 620 in the first direction. Since the nut 625 is rotationally constrained, rotation of the lead screw 620 can move the nut 625 axially relative to the lead screw 620, which in turn can move the actuator arm 630. In the example of
If the polarity of the power to the motor 610 is reversed, the motor 610 can rotate the shaft 615 in a second direction, which can rotate the lead screw 620 in a second direction to return the nut 625 and the screw 635. A return spring 705 can return the actuator arm 630 to the locked position of
In general, components of the system 100 may be coupled directly or indirectly. For example, the motor 610 may be directly coupled to the shaft 615 and may be indirectly coupled to the locking arm 405 through the actuator arm 630. Coupling may include fluid, mechanical, thermal, electrical, or chemical coupling (such as a chemical bond), or some combination of coupling in some contexts. For example, the motor 610 may be mechanically coupled to the shaft 325 and may be electrically coupled to the access control unit 125. In some embodiments, components may also be coupled by virtue of physical proximity, being integral to a single structure, or being formed from the same piece of material.
The systems, apparatuses, and methods described herein may provide significant advantages. Some embodiments may be particularly advantageous for reducing the cost of operating and maintaining doorway exit devices. For example, some embodiments can be installed without installing additional power sources or connecting to utility power sources, which can significantly reduce installation cost and allow installation in locations without utility power.
While shown in a few illustrative embodiments, a person having ordinary skill in the art will recognize that the systems, and apparatuses described herein are susceptible to various changes and modifications that fall within the scope of the appended claims. Moreover, descriptions of various alternatives using terms such as “or” do not require mutual exclusivity unless clearly required by the context, and the indefinite articles “a” or “an” do not limit the subject to a single instance unless clearly required by the context. Components may also be combined or eliminated in various configurations for purposes of sale, manufacture, assembly, or use. For example, in some configurations, the lock actuator 605 may be separated from or combined with other components in various ways for sale, manufacture, assembly, or use.
The claims may also encompass additional subject matter not specifically recited in detail. For example, certain features, elements, or aspects may be omitted from the claims if not necessary to distinguish the novel and inventive features from what is already known to a person having ordinary skill in the art. Features, elements, and aspects described in the context of some embodiments may also be omitted, combined, or replaced by alternative features serving the same, equivalent, or similar purpose without departing from the scope of the invention defined by the appended claims.
Number | Date | Country | |
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63369852 | Jul 2022 | US | |
63516338 | Jul 2023 | US |