US3670538A - Controllable key lock - Google Patents

Controllable key lock Download PDF

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Publication number
US3670538A
US3670538A US88833A US3670538DA US3670538A US 3670538 A US3670538 A US 3670538A US 88833 A US88833 A US 88833A US 3670538D A US3670538D A US 3670538DA US 3670538 A US3670538 A US 3670538A
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Prior art keywords
key
tumbler
plug
keyway
tumblers
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Expired - Lifetime
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US88833A
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Robert E Curry
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Classifications

    • 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
    • E05B47/06—Controlling mechanically-operated bolts by electro-magnetically-operated detents
    • E05B47/0611—Cylinder locks with electromagnetic control
    • E05B47/0619—Cylinder locks with electromagnetic control by blocking the rotor
    • E05B47/0626—Cylinder locks with electromagnetic control by blocking the rotor radially
    • E05B47/063—Cylinder locks with electromagnetic control by blocking the rotor radially with a rectilinearly moveable blocking element
    • E—FIXED CONSTRUCTIONS
    • E05—LOCKS; KEYS; WINDOW OR DOOR FITTINGS; SAFES
    • E05B—LOCKS; ACCESSORIES THEREFOR; HANDCUFFS
    • E05B43/00—Time locks
    • E05B43/005—Timer devices controlling electrically operated locks
    • 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
    • E05B47/0002—Operating or controlling locks or other fastening devices by electric or magnetic means with electric actuators; Constructional features thereof with electromagnets
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T70/00—Locks
    • Y10T70/70—Operating mechanism
    • Y10T70/7006—Predetermined time interval controlled
    • Y10T70/7028—Electric
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T70/00—Locks
    • Y10T70/70—Operating mechanism
    • Y10T70/7051—Using a powered device [e.g., motor]
    • Y10T70/7062—Electrical type [e.g., solenoid]
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T70/00—Locks
    • Y10T70/70—Operating mechanism
    • Y10T70/7441—Key
    • Y10T70/7446—Multiple keys

Definitions

  • ABSTRACT A lock consisting of a key plug having a keyway therein, a line of conventional tumblers for locking the key plug against release movement and an auxiliary tumbler assembly located at the inner end of the line of tumblers and projecting into the keyway.
  • a timer operated solenoid is associated with the auxiliary tumbler assembly for rendering the auxiliary tumbler assembly inoperative during selected time periods.
  • a first key having a land engageable with the auxiliary tumbler assembly is operable to move all of the tumblers to plug release positions at all times and a second key lacking a land engageable with the auxiliary tumbler assembly is incapable of actuating the auxiliary tumbler assembly so that the second key is useful only during the selected time periods.
  • the lock of this invention consists of the usual rotatable key plug mounted in a cylinder.
  • a series of conventional tumblers are mounted in the cylinder and the plug and an auxiliary tumbler assembly is provided which is connected to a timer operated solenoid.
  • the key plug has the usual keyway formed therein in which a key can be inserted so that the lands on the key can move the tumblers to plug release positions.
  • the solenoid is energized
  • the auxiliary tumbler assembly is rendered inoperative. Consequently, a key lacking a land engageable with the auxiliary tumbler assembly can be used to unlock the lock when the solenoid is energized.
  • the auxiliary tumbler assembly When the solenoid is deenergized, the auxiliary tumbler assembly is operative so that only a key having a land thereon of predetermined configuration engageable with the auxiliary tumbler assembly can be used to unlock the lock.
  • some personnel associated with a given area to which access is to be restricted during certain time periods can be provided with keys lacking the land engageable with the auxiliary tumbler assembly. Keys of this type are operable to unlock the lock only during the preselected time periods during which the solenoid is energized.
  • Other personnel can be furnished keys provided with lands engageable with the auxiliary tumbler assembly so that these personnel can unlock the lock at all times.
  • the principal object of the present invention is to provide an improved selectively actuatable lock.
  • FIG. 1 is a sectional view of the improved lock of this invention shown in assembly relation with a solenoid and a timer and showing a restricted access key inserted in the lock;
  • FIG. 2 is a sectional view of the lock of this invention show- 7 ing a full access type key inserted therein.
  • FIG. 1 the lock of this invention, indicated generally at 10 is illustrated in FIG. 1 as consisting of a conventional cylinder 12 in which a key plug 14 is rotatably mounted.
  • the key plug 14 is formed with a slot shaped keyway 16 in which both the keys l8 and 20 shown in FIGS. 1 and 2, respectively, can be inserted.
  • a plurality of conventional pin tumblers 22 are slidably mounted in the plug 14 and are associated with conventional spring pressed driver tumblers 24 mounted in the cylinder 12.
  • the pin tumblers 22 project into the keyway 16 so that when either of the keys 18 or 20 is inserted in the keyway l6, lands 26 of predetermined configuration on the key move the pin tumblers 22 to the positions illustrated in FIGS.
  • an auxiliary tumbler assembly 30 is mounted on the cylinder 12 and the plug 14 at the inner end of the line of tumblers 22 and 24.
  • the assembly 30 consists of a pin tumbler 32 slidably mounted in an opening 34 in the plug 14 and a driver tumbler 36 engaged at one end with the pin tumbler 32 and at the other end by a spring 38 which urges the driver tumbler 36 toward the keyway 16.
  • the driver tumbler 36 is integrally formed with a stem 40 which projects out of the cylinder 12 and is associated with a solenoid 42 connected to a timer 44.
  • the timer 44 is operable to energize the solenoid 42 during preselected time periods.
  • the driver tumbler 36 When the solenoid 42 is energized, the driver tumbler 36 is retracted in the cylinder 12 to the broken line position shown in FIG. 1. When the driver tumbler 36 is in its retracted position, both the pin tumbler 32 and the driver tumbler 36 are incapable of preventing rotation of the plug 14 within the cylinder 12 when either of the keys 18 or 20 is inserted in the keyway 16. How ever, as shown in FIG. 1, when the solenoid 42 is deenergized. the spring 38 is capable of moving the driver tumbler 36 to a position in which it projects into the plug opening 34 so as to prevent rotation of the plug 14 when the key 18 is inserted in the keyway 16.
  • the key 18 is provided with a flat 46 that aligns with the pin tumbler 32 when the key 18 is inserted in the keyway 16.
  • the key 20 is identical to the key 18 except for the provision thereon of an additional land 48 which is engageable with the pin tumbler 32 when the key 20 is inserted in the keyway 16.
  • the land 48 is shaped to move the tumblers 32 and 36 to plug release positions when the solenoid 42 is deenergized. It can thus be seen that when the solenoid 42 is energized, both the keys l8 and 20 are capable of rotating the key plug 14, which constitutes unlocking of the lock 10. When the solenoid 42 is deenergized only the key 20 is capable of unlocking the lock 10.
  • the lock 10 of this invention In the operation of the lock 10 of this invention, assume that the lock 10 is installed in the front door of a building and that access to the building by certain personnel is to be limited to certain time periods while it is desirable to provide access to the building to key personnel at all times.
  • the timer 44 is connected to a suitable source of current and is preset to energize the solenoid 42 during those time periods when access of all personnel to the building is desirable. During those time periods when only access of key personnel to the building is desired, the timer 44 operates to deenergize the solenoid 42.
  • the key personnel are furnished with full access keys 20 and other personnel are furnished with limited access keys 18. As a result, only the key personnel can unlock the lock 10 during those time periods when the solenoid 42 is deenergized.
  • a key plug having a keyway therein, a series of tumblers for locking said key plug against release movement, said tumblers being adapted for positioning by a key entering said keyway to release said plug for release movement, an auxiliary tumbler assembly projecting into said keyway, and means operatively associated with said auxiliary tumbler assembly for rendering said auxiliary tumbler assembly inoperative to affect release movement of said key plug at some times and operative to aflect release movement of said key plug at other times, said means comprising electrically operable means capable of applying a force to said auxiliary tumbler assembly at preselected times.
  • a lock according to claim 1 wherein said last mentioned means includes solenoid means operable when energized to render said auxiliary tumbler assembly inoperative.
  • auxiliary tumbler assembly comprises a pin tumbler slidably mounted in means having lands thereon corresponding only to said additional lands.
  • a lock according to claim 7 further including timer means in circuit with said solenoid means and operable to provide for energizing of said solenoid means at preselected time periods.

Abstract

A lock consisting of a key plug having a keyway therein, a line of conventional tumblers for locking the key plug against release movement and an auxiliary tumbler assembly located at the inner end of the line of tumblers and projecting into the keyway. A timer operated solenoid is associated with the auxiliary tumbler assembly for rendering the auxiliary tumbler assembly inoperative during selected time periods. As a result, a first key having a land engageable with the auxiliary tumbler assembly is operable to move all of the tumblers to plug release positions at all times and a second key lacking a land engageable with the auxiliary tumbler assembly is incapable of actuating the auxiliary tumbler assembly so that the second key is useful only during the selected time periods.

Description

United States Patent Curry [4 1 June 20, 1972 [54] CONTROLLABLE KEY LOCK [72] Inventor: Robert E. Curry, 1935 Collegewood Drive, Ypsilanti, Mich. 48197 [22] Filed: Nov. 12, 1970 [21] Appl. No.: 88,833
Primary Examiner-Albert G. Craig, Jr. Attorney-Olsen and Stephenson [5 7] ABSTRACT A lock consisting of a key plug having a keyway therein, a line of conventional tumblers for locking the key plug against release movement and an auxiliary tumbler assembly located at the inner end of the line of tumblers and projecting into the keyway. A timer operated solenoid is associated with the auxiliary tumbler assembly for rendering the auxiliary tumbler assembly inoperative during selected time periods. As a result, a first key having a land engageable with the auxiliary tumbler assembly is operable to move all of the tumblers to plug release positions at all times and a second key lacking a land engageable with the auxiliary tumbler assembly is incapable of actuating the auxiliary tumbler assembly so that the second key is useful only during the selected time periods.
8 Claims, 2 Drawing Figures CONTROLLABLE KEY LOCK BACKGROUND OF THE INVENTION It is often desirable to limit access to locked buildings and the like to certain personnel to certain time periods, while at the same time enabling access to the building by other personnel at all times. It is an object of the present invention, therefore, to provide a single lock and two keys for the lock, one of which is operable at all times to actuate the lock and the other one of which is operable only during selected time periods to actuate the lock.
SUMMARY OF THE INVENTION The lock of this invention consists of the usual rotatable key plug mounted in a cylinder. A series of conventional tumblers are mounted in the cylinder and the plug and an auxiliary tumbler assembly is provided which is connected to a timer operated solenoid. The key plug has the usual keyway formed therein in which a key can be inserted so that the lands on the key can move the tumblers to plug release positions. When the solenoid is energized, the auxiliary tumbler assembly is rendered inoperative. Consequently, a key lacking a land engageable with the auxiliary tumbler assembly can be used to unlock the lock when the solenoid is energized. When the solenoid is deenergized, the auxiliary tumbler assembly is operative so that only a key having a land thereon of predetermined configuration engageable with the auxiliary tumbler assembly can be used to unlock the lock. As a result, some personnel associated with a given area to which access is to be restricted during certain time periods can be provided with keys lacking the land engageable with the auxiliary tumbler assembly. Keys of this type are operable to unlock the lock only during the preselected time periods during which the solenoid is energized. Other personnel can be furnished keys provided with lands engageable with the auxiliary tumbler assembly so that these personnel can unlock the lock at all times.
The principal object of the present invention, therefore, is to provide an improved selectively actuatable lock.
Further objects, features and advantages of this invention will become apparent from a consideration of the following description, the appended claims, and the accompanying drawing in which:
FIG. 1 is a sectional view of the improved lock of this invention shown in assembly relation with a solenoid and a timer and showing a restricted access key inserted in the lock; and
FIG. 2 is a sectional view of the lock of this invention show- 7 ing a full access type key inserted therein.
With reference to the drawing, the lock of this invention, indicated generally at 10 is illustrated in FIG. 1 as consisting of a conventional cylinder 12 in which a key plug 14 is rotatably mounted. The key plug 14 is formed with a slot shaped keyway 16 in which both the keys l8 and 20 shown in FIGS. 1 and 2, respectively, can be inserted. A plurality of conventional pin tumblers 22 are slidably mounted in the plug 14 and are associated with conventional spring pressed driver tumblers 24 mounted in the cylinder 12. The pin tumblers 22 project into the keyway 16 so that when either of the keys 18 or 20 is inserted in the keyway l6, lands 26 of predetermined configuration on the key move the pin tumblers 22 to the positions illustrated in FIGS. 1 and 2 in which the plug 14 is released for rotatable movement within the cylinder 12. Rotation of the plug 14 operates to unlock the lock 10, as is conventional. When a key 18 or 20 is withdrawn from the keyway .16, the driver tumblers 24 are moved by the springs associated therewith to positions preventing rotatable movement of the plug 14 within the cylinder 12, as is well knownin the art.
In the lock 10 of this invention, an auxiliary tumbler assembly 30 is mounted on the cylinder 12 and the plug 14 at the inner end of the line of tumblers 22 and 24. The assembly 30 consists of a pin tumbler 32 slidably mounted in an opening 34 in the plug 14 and a driver tumbler 36 engaged at one end with the pin tumbler 32 and at the other end by a spring 38 which urges the driver tumbler 36 toward the keyway 16. The driver tumbler 36 is integrally formed with a stem 40 which projects out of the cylinder 12 and is associated with a solenoid 42 connected to a timer 44. The timer 44 is operable to energize the solenoid 42 during preselected time periods. When the solenoid 42 is energized, the driver tumbler 36 is retracted in the cylinder 12 to the broken line position shown in FIG. 1. When the driver tumbler 36 is in its retracted position, both the pin tumbler 32 and the driver tumbler 36 are incapable of preventing rotation of the plug 14 within the cylinder 12 when either of the keys 18 or 20 is inserted in the keyway 16. How ever, as shown in FIG. 1, when the solenoid 42 is deenergized. the spring 38 is capable of moving the driver tumbler 36 to a position in which it projects into the plug opening 34 so as to prevent rotation of the plug 14 when the key 18 is inserted in the keyway 16.
The key 18 is provided with a flat 46 that aligns with the pin tumbler 32 when the key 18 is inserted in the keyway 16. The key 20 is identical to the key 18 except for the provision thereon of an additional land 48 which is engageable with the pin tumbler 32 when the key 20 is inserted in the keyway 16. The land 48 is shaped to move the tumblers 32 and 36 to plug release positions when the solenoid 42 is deenergized. It can thus be seen that when the solenoid 42 is energized, both the keys l8 and 20 are capable of rotating the key plug 14, which constitutes unlocking of the lock 10. When the solenoid 42 is deenergized only the key 20 is capable of unlocking the lock 10.
In the operation of the lock 10 of this invention, assume that the lock 10 is installed in the front door of a building and that access to the building by certain personnel is to be limited to certain time periods while it is desirable to provide access to the building to key personnel at all times. The timer 44 is connected to a suitable source of current and is preset to energize the solenoid 42 during those time periods when access of all personnel to the building is desirable. During those time periods when only access of key personnel to the building is desired, the timer 44 operates to deenergize the solenoid 42. The key personnel are furnished with full access keys 20 and other personnel are furnished with limited access keys 18. As a result, only the key personnel can unlock the lock 10 during those time periods when the solenoid 42 is deenergized.
What is claimed is:
1. In a lock, a key plug having a keyway therein, a series of tumblers for locking said key plug against release movement, said tumblers being adapted for positioning by a key entering said keyway to release said plug for release movement, an auxiliary tumbler assembly projecting into said keyway, and means operatively associated with said auxiliary tumbler assembly for rendering said auxiliary tumbler assembly inoperative to affect release movement of said key plug at some times and operative to aflect release movement of said key plug at other times, said means comprising electrically operable means capable of applying a force to said auxiliary tumbler assembly at preselected times.
2. A lock according to claim 1 wherein said last mentioned means includes a pre-settable timer.
3. A lock according to claim 1 wherein said series of tumblers is arranged in a line extending longitudinally of said 7 keyway, said auxiliary tumbler assembly being located at one end of said line.
4. A lock according to claim 1 wherein said last mentioned means includes solenoid means operable when energized to render said auxiliary tumbler assembly inoperative.
5. A lock according to claim 1 wherein said auxiliary tumbler assembly comprises a pin tumbler slidably mounted in means having lands thereon corresponding only to said additional lands.
8. A lock according to claim 7 further including timer means in circuit with said solenoid means and operable to provide for energizing of said solenoid means at preselected time periods.
l l I

Claims (8)

1. In a lock, a key plug having a keyway therein, a series of tumblers for locking said key plug against release movement, said tumblers being adapted for positioning by a key entering said keyway to releasE said plug for release movement, an auxiliary tumbler assembly projecting into said keyway, and means operatively associated with said auxiliary tumbler assembly for rendering said auxiliary tumbler assembly inoperative to affect release movement of said key plug at some times and operative to affect release movement of said key plug at other times, said means comprising electrically operable means capable of applying a force to said auxiliary tumbler assembly at preselected times.
2. A lock according to claim 1 wherein said last mentioned means includes a pre-settable timer.
3. A lock according to claim 1 wherein said series of tumblers is arranged in a line extending longitudinally of said keyway, said auxiliary tumbler assembly being located at one end of said line.
4. A lock according to claim 1 wherein said last mentioned means includes solenoid means operable when energized to render said auxiliary tumbler assembly inoperative.
5. A lock according to claim 1 wherein said auxiliary tumbler assembly comprises a pin tumbler slidably mounted in said plug and a spring pressed driver tumbler engaged with said pin tumbler and operable to urge said pin tumbler in a direction inwardly of said keyway and solenoid means connected to said driver tumbler and operable when energized to move said driver tumbler in a direction away from said pin tumbler.
6. A lock according to claim 5 further including first key means having a first land engageable with said pin tumbler on insertion of said key into said keyway and additional lands engageable with said series of tumblers on insertion of said key into said keyway, said first key land being operable to move said pin tumbler and said driver tumbler to plug release positions and said additional lands being operable to move said series of tumblers to plug release positions.
7. A lock according to claim 6 further including second key means having lands thereon corresponding only to said additional lands.
8. A lock according to claim 7 further including timer means in circuit with said solenoid means and operable to provide for energizing of said solenoid means at preselected time periods.
US88833A 1970-11-12 1970-11-12 Controllable key lock Expired - Lifetime US3670538A (en)

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Cited By (21)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3782143A (en) * 1972-05-01 1974-01-01 Schlage Lock Co Pickproof lock cylinder
US3787812A (en) * 1971-10-20 1974-01-22 Waterbury Pressed Metal Co Pick-proof lock
US3889501A (en) * 1973-08-14 1975-06-17 Charles P Fort Combination electrical and mechanical lock system
US4068507A (en) * 1976-08-11 1978-01-17 C. Hager & Sons Hinge Manufacturing Company Limited access lock
DE3008728A1 (en) * 1980-03-07 1981-09-24 Zeiss Ikon Ag Cylinder lock mechanism with electromagnetic emergency device - modifying lock to allow it to be operated by emergency key
US4415893A (en) * 1978-06-27 1983-11-15 All-Lock Electronics, Inc. Door control system
EP0107973A2 (en) * 1982-10-28 1984-05-09 P.A. Terry (Security Consultants) Limited Lever lock safety device
US4807454A (en) * 1987-04-21 1989-02-28 Zeiss Ikon Ag Means for locking a displaceable or rotatable part
US4854146A (en) * 1985-10-25 1989-08-08 Lowe And Fletcher Limited Security device and method
US4901545A (en) * 1987-12-28 1990-02-20 Rising Star Technologies (A Partnership) Self-contained electromechanical locking device
DE9004623U1 (en) * 1990-04-24 1990-06-21 Bks Gmbh, 5620 Velbert, De
US4977765A (en) * 1990-06-04 1990-12-18 Claude Legault Delay action electronic timer lock with automatic cancellation cam
US4991415A (en) * 1990-07-18 1991-02-12 Gary Shieh Lock with electronic warning and electromagnetic control system
EP0709533A3 (en) * 1994-10-25 1996-09-04 Karrenberg Fa Wilhelm Lock cylinder with electromagnetically actuated tumbler pin
US5561997A (en) * 1993-02-08 1996-10-08 Marlok Company Electromagnetic lock for cylindrical lock barrel
US5605066A (en) * 1992-04-16 1997-02-25 Abloy Security Ltd Oy Electromechanical lock arrangement
NL1004691C2 (en) * 1996-12-04 1998-06-08 Hubertus Joseph Hendricus Mari Cylinder lock with operable lock.
US20050275535A1 (en) * 2004-06-01 2005-12-15 Hui-Hua Hsieh Lock core with an alarm
WO2009086635A2 (en) * 2008-01-07 2009-07-16 Adams Albert G Electro-mechanical leverlock with switching system
US20150096340A1 (en) * 2012-09-27 2015-04-09 Bum Soo Kim Key cylinder for electronic locking device
US20220290462A1 (en) * 2019-08-21 2022-09-15 Zhuhai Utaiot Technology Co., Ltd. Lock Cylinder and Unlocking Key

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3099151A (en) * 1961-01-16 1963-07-30 Schlage Lock Co Pin tumbler cylinder key system

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3099151A (en) * 1961-01-16 1963-07-30 Schlage Lock Co Pin tumbler cylinder key system

Cited By (25)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3787812A (en) * 1971-10-20 1974-01-22 Waterbury Pressed Metal Co Pick-proof lock
US3782143A (en) * 1972-05-01 1974-01-01 Schlage Lock Co Pickproof lock cylinder
US3889501A (en) * 1973-08-14 1975-06-17 Charles P Fort Combination electrical and mechanical lock system
US4068507A (en) * 1976-08-11 1978-01-17 C. Hager & Sons Hinge Manufacturing Company Limited access lock
US4415893A (en) * 1978-06-27 1983-11-15 All-Lock Electronics, Inc. Door control system
DE3008728A1 (en) * 1980-03-07 1981-09-24 Zeiss Ikon Ag Cylinder lock mechanism with electromagnetic emergency device - modifying lock to allow it to be operated by emergency key
EP0107973A2 (en) * 1982-10-28 1984-05-09 P.A. Terry (Security Consultants) Limited Lever lock safety device
EP0107973A3 (en) * 1982-10-28 1984-08-29 P.A. Terry (Security Consultants) Limited Lever lock safety device
US4854146A (en) * 1985-10-25 1989-08-08 Lowe And Fletcher Limited Security device and method
US4916927A (en) * 1985-10-25 1990-04-17 Connell John O Lock and method of securing and releasing a member
US4807454A (en) * 1987-04-21 1989-02-28 Zeiss Ikon Ag Means for locking a displaceable or rotatable part
US4901545A (en) * 1987-12-28 1990-02-20 Rising Star Technologies (A Partnership) Self-contained electromechanical locking device
DE9004623U1 (en) * 1990-04-24 1990-06-21 Bks Gmbh, 5620 Velbert, De
US4977765A (en) * 1990-06-04 1990-12-18 Claude Legault Delay action electronic timer lock with automatic cancellation cam
US4991415A (en) * 1990-07-18 1991-02-12 Gary Shieh Lock with electronic warning and electromagnetic control system
US5605066A (en) * 1992-04-16 1997-02-25 Abloy Security Ltd Oy Electromechanical lock arrangement
US5561997A (en) * 1993-02-08 1996-10-08 Marlok Company Electromagnetic lock for cylindrical lock barrel
EP0709533A3 (en) * 1994-10-25 1996-09-04 Karrenberg Fa Wilhelm Lock cylinder with electromagnetically actuated tumbler pin
NL1004691C2 (en) * 1996-12-04 1998-06-08 Hubertus Joseph Hendricus Mari Cylinder lock with operable lock.
US20050275535A1 (en) * 2004-06-01 2005-12-15 Hui-Hua Hsieh Lock core with an alarm
WO2009086635A2 (en) * 2008-01-07 2009-07-16 Adams Albert G Electro-mechanical leverlock with switching system
WO2009086635A3 (en) * 2008-01-07 2009-09-11 Adams Albert G Electro-mechanical leverlock with switching system
US20150096340A1 (en) * 2012-09-27 2015-04-09 Bum Soo Kim Key cylinder for electronic locking device
US9273493B2 (en) * 2012-09-27 2016-03-01 Bum Soo Kim Key cylinder for electronic locking device
US20220290462A1 (en) * 2019-08-21 2022-09-15 Zhuhai Utaiot Technology Co., Ltd. Lock Cylinder and Unlocking Key

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