The present invention relates generally to door mounted security systems and, more particularly, to a lock system that can be employed with entry control devices to control access through a door.
Entry control devices are generally mounted on a door and/or a doorframe and operate to limit access through the door. Some conventional entry control devices include a clutch mechanism that selectively couples a bolt and a handle in response to an electronic input, which may be provided by a keypad, a contact activatable chip, a card reader, and other similar input devices. In some cases, entry control devices, and particularly electronically controlled entry devices, are inoperable during power failures and/or when dedicated power sources fail. Additionally, when electrical power is unavailable, conventional electronically controlled entry control devices generally remain in a locked position, restricting access through the door.
The present invention provides a lock system for securing a door and a doorframe. In one construction, the lock system includes a clutch mechanism and a lockset with a lockable latch and an actuator for operating the latch. The clutch mechanism includes an input cam, an output cam, and an engagement pin that is dimensioned and configured for axial movement between first and second positions. In the first position, the engagement pin engages both the input and the output cams to couple the input and output cams so that they rotate synchronously, allowing the door to be opened. In the second position, the engagement pin does not engage both the cams and thereby allows independent rotational movement of the input cam and the output cam so that pivoting of the exterior latch lever does not retract the latch.
In other constructions, an arcuate carriage cooperates with the engagement pin to move the engagement pin between the first position and the second position. A frame biases the carriage towards a third position, in which the frame maintains the engagement pin in the first position. A removable interchangeable core, when installed, blocks the frame moving the carriage toward the third position. The core, when removed, allows the frame to move the carriage toward the third position, resulting in movement of the engagement pin toward the first position and permitting retraction of the latch.
Other features and advantages of the invention will become apparent to those skilled in the art upon review of the following detailed description, claims, and drawings.
The present invention is further described with reference to the accompanying drawings, which show constructions of the present invention. However, it should be noted that the invention as disclosed in the accompanying drawings is illustrated by way of example only. The various elements and combinations of elements described below and illustrated in the drawings can be arranged and organized differently to result in constructions which are still within the spirit and scope of the present invention.
In the drawings, wherein like reference numerals indicate like parts:
The terms “first”, “second”, “upward”, “downward”, “horizontal”, and “vertical” are used herein and in the appended claims for description only and are not intended to imply any particular orientation, order, or importance.
As described in greater detail below, the lock system 10 includes an electronically operated clutch mechanism having an override assembly. In some constructions of the present invention, some of the elements of the lock system 10 function in a manner that is similar to the apparatuses described in U.S. Pat. No. 6,286,347, issued Sep. 11, 2001, entitled “CLUTCH MECHANISM WITH MOVEABLE INJECTOR RETAINER WALL FOR DOOR LOCK SYSTEM” and U.S. Pat. No. 5,640,863, issued Jun. 24, 1997, entitled “CLUTCH MECHANISM FOR DOOR LOCK SYSTEM that are hereby incorporated by reference. Additionally, persons of ordinary skill in the art will recognize the advantages inherent in clutch operated mechanisms, which can operate in combination with lever handles that comply with the regulatory requirements of the Americans with Disabilities Act.
As shown in
The handle 14 is coupled to an input cam 18, which extends through the cover 15 and defines a first axis A. Together, the handle 14 and the input cam 18 are pivotable about the first axis A. An output cam 20 is arranged on an interior side of the cover 15 and is coupled to lockset 21. The output cam 20 defines a second axis B and includes an engagement pin or shaft 22 having an arcuately shaped head 24. Together, the input and output cams 18, 20 operate as a clutch, providing selective operation of the door lock system 10 as described in greater detail below.
The engagement pin 22 is moveable along the second axis B between a first or disengaged position (shown in
As shown in
As shown in
As shown in
The position of the carriage 27 is also controlled by an override pusher or frame 36. The frame 36 is a generally U-shaped member having a lower generally horizontal leg 38 and an upper generally horizontal leg 40. The frame 36 is slideably mounted on the interior side of the base plate 16 between mounting tabs 42 for generally vertical sliding movement between a first or neutral position (shown in
When the core 12 is removed (as shown in
When electrical power fails and/or when the batteries 29 fail, the motor 28 and/or keypad 34 may be rendered inoperable. However, maintenance personnel and/or emergency workers using a control key can remove the core 12. As explained above, removal of the core 12 allows the bias spring 44 to push the frame 36 downward toward the override position, effectively unlocking the lock system 10 by forming a direct linkage between the handle 14 and the lockset 21. Once the direct linkage between the handle 14 and the lockset 21 is established, an operator can open the door by pivoting the handle 14 about the first axis A in a conventional manner.
As shown in
Selective coupling of the input cam 54 and the output cam 56 is achieved by axial positioning of an engagement pin 58, which includes an arcuately shaped head 60 and defines a second axis D. The engagement pin 58 is moveable along the second axis D between a first or disengaged position (shown in
A carriage 61 includes an arcuately shaped camming surface 62 that accommodates pivoting movement of the handle 14 and the input cam 18 about the first axis C. Accordingly, the axial position of the engagement pin 58 can be controlled throughout the pivoting travel range of the handle 14. Additionally, the carriage 61 is moveable axially along the interior surface of the base plate 53 between a first or upward-most position (shown in
The position of the carriage 61 is at least partially a function of a bias provided by motor (e.g., a bi-directional DC motor) 28 mounted on the base plate 55. The motor 28 includes a motor shaft (not shown) and a spring shaft 64 that engages a drive pin (not shown), which is coupled to the carriage 61. More particularly, when the motor 28 rotates the motor shaft in a first direction (e.g., clockwise), the motor 28 moves the carriage 61 toward the upward-most position. Alternatively, when the motor 28 rotates the motor shaft in a second direction (e.g., counterclockwise), the motor 28 moves the carriage 61 toward the downward-most position.
The position of the carriage 61 is also at least partially a function of the override pusher 66. The override pusher 66 is a generally L-shaped body having an upper generally horizontal leg 68. The override pusher 66 is mounted between mounting tabs 70 for generally vertical sliding movement between a first or neutral position (shown in
When the core 12 is removed, as shown in
Accordingly, during an emergency and/or when the power to the motor 28 is interrupted, an authorized person using a control key can easily remove the core 12. Removal of the core 12 causes downward movement of the frame 66, causing movement of the carriage 61, which effectively unlocks the mechanism 10 by engaging the handle 14 and the input cam 18 with the output cam 20. At all other times, the operation of the lock apparatus 50 is unchanged.
The terms “core” and “interchangeable core” as used herein refer to a wide spectrum of commercially available locking cylinders operated by control keys that allow replacement of the core of a lock system for re-keying purposes. Thus, as used herein and in the appended claims the terms “core” and “interchangeable core” refer to a wide range of components that may be readily interchangeable in various conventional lock devices.
The constructions described above and illustrated in the drawings are presented by way of example only and are not intended as a limitation upon the concepts and principles of the present invention. As such, it will be appreciated by one having ordinary skill in the art, that various changes in the elements and their configuration and arrangement are possible without departing from the spirit and scope of the present invention as set forth in the appended claims.
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