US3797004A - Lock tumbler cylinder picking alarm - Google Patents

Lock tumbler cylinder picking alarm Download PDF

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Publication number
US3797004A
US3797004A US00201690A US3797004DA US3797004A US 3797004 A US3797004 A US 3797004A US 00201690 A US00201690 A US 00201690A US 3797004D A US3797004D A US 3797004DA US 3797004 A US3797004 A US 3797004A
Authority
US
United States
Prior art keywords
keyway
shutter
switch
key
opening
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
US00201690A
Other languages
English (en)
Inventor
D Muessel
W Eisenreich
I Schieber
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Eaton Corp
Yale Security Inc
Original Assignee
Eaton Corp
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Eaton Corp filed Critical Eaton Corp
Application granted granted Critical
Publication of US3797004A publication Critical patent/US3797004A/en
Assigned to YALE SECURITY INC., A CORP. OF DE. reassignment YALE SECURITY INC., A CORP. OF DE. ASSIGNMENT OF ASSIGNORS INTEREST. Assignors: SCOVILL INC.
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • E—FIXED CONSTRUCTIONS
    • E05—LOCKS; KEYS; WINDOW OR DOOR FITTINGS; SAFES
    • E05B—LOCKS; ACCESSORIES THEREFOR; HANDCUFFS
    • E05B45/00—Alarm locks
    • E05B45/06—Electric alarm locks
    • E05B45/0605—Electric alarm locks for preventing of leaving the key
    • E—FIXED CONSTRUCTIONS
    • E05—LOCKS; KEYS; WINDOW OR DOOR FITTINGS; SAFES
    • E05B—LOCKS; ACCESSORIES THEREFOR; HANDCUFFS
    • E05B45/00—Alarm locks
    • E05B45/06—Electric alarm locks
    • E05B45/08—Electric alarm locks with contact making inside the lock or in the striking plate
    • E05B45/10—Electric alarm locks with contact making inside the lock or in the striking plate by introducing the key or another object
    • E—FIXED CONSTRUCTIONS
    • E05—LOCKS; KEYS; WINDOW OR DOOR FITTINGS; SAFES
    • E05B—LOCKS; ACCESSORIES THEREFOR; HANDCUFFS
    • E05B17/00—Accessories in connection with locks
    • E05B17/14—Closures or guards for keyholes
    • E05B17/18—Closures or guards for keyholes shaped as lids or slides
    • E05B17/181—Closures or guards for keyholes shaped as lids or slides pivoting inwardly
    • E—FIXED CONSTRUCTIONS
    • E05—LOCKS; KEYS; WINDOW OR DOOR FITTINGS; SAFES
    • E05B—LOCKS; ACCESSORIES THEREFOR; HANDCUFFS
    • E05B17/00—Accessories in connection with locks
    • E05B17/14—Closures or guards for keyholes
    • E05B17/18—Closures or guards for keyholes shaped as lids or slides
    • E05B17/186—Closures or guards for keyholes shaped as lids or slides sliding
    • 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
    • Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10S70/00—Locks
    • Y10S70/49—Locks with alarm

Definitions

  • a key or other instrument inserted toward the keyway must move the shutter so that the spring arm will complete an electric circuit causing an alarm signal before the instrument can engage'any one of the lock tumblers.
  • the shutter will move away from the spring arm when the key plug rotates so that the alarm signal will be brief when a proper key is used, and a short time delay in the alarm circuit then will withhold operation of an alarm.
  • the short duration of the time delay enables the alarm to operate when the alarm signal is quite 'short, offering early warning when a picking instrument is inserted toward the tumblers.
  • the guard member of our invention is a shutter that normally closes the keyway entrance opening, and that must move to actuate the switch so as to offer an alarm signal before an instrument can move toward the tumblers in the keyway.
  • the alarm circuit may comprise a time delay actuated by the alarm signal and withholding operation of an alarm for a time that is sufficient to permit use of the proper key.
  • the guard member or shutter will actuate the electric switch through means that enable the switch to move to unactuated position when a key moves the key plug in a release direction. Then there need be only a brief alarm signal incidental to use of a proper key, enabling the alarm circuit to have a time delay of a duration so short that merely a short alarm signal will operate the alarm, thus giving almost immediate warning when a person prepares to pick the lock tumblers.
  • FIG. 1 shows a perspective view of a lock tumbler cylinder assembly utilizing our invention
  • FIG. 2 shows a front end view partly' in section on the broken line 22 in FIG. 3;
  • FIG. 3 shows a plan view partly in section on the line 33 in FIG. 2;
  • FIG. 4 shows a perspective view of the shutter for the keyway entrance opening
  • FIG. 5 shows a block diagram of an alarm circuit connected to the switch of the cylinder assembly
  • FIG. 6 shows parts of FIG. 2 but illustrates key operation of the key plug
  • FIG. 7 shows a partly sectional plan view of a further form of the invention.
  • FIG. 8 shows a partly sectional plan view of a form v DESCRIPTION OF THE PREFERRED EMBODIMENTS
  • our cylinder assembly is indicated generally by the numeral 10, and includes a cylinder 11, a key plug 12 mounted for rotation in a bore of cylinder 11, and an electric switch 13 mounted on a recessed outer portion of cylinder 11.
  • FIG. 3 shows the key plug 12 equipped with a rather usual series of pin tumblers 14 to which access may be had through a longitudinal keyway 15 in the key plug.
  • the particular type of tumbler is not important to an understanding of the invention, and it is merely necessary here to know that tum blers 14 normally lock key plug 12 against rotation in cylinder 1 1 and should move to release position only by use of a proper key. Nevertheless, as with other types of tumblers, tumblers 14 may bevulnerable to a person who manipulates a picking instrument in the keyway 15, as will be understood.
  • the key plug 12 comprises a front portion 16 having an opening 17 that forms anentrance to the keyway 15, and mounting a shutter 18 that forms a guard member for the opening 17.
  • the front portion 16 of the key plug is recessed to accept the shutter 18 at one side of the keyway entrance opening 17, and is formed with a groove 19 engaging a rib 20 on the shutter so as to guide the shutter for sliding in a transverse direction relatively to the entrance opening 17.
  • a scalp or cover member 21 is secured on the front portion 16 of the key plug, in effect forming an integral part of the front portion and holding the shutter 18 in assembled relation.
  • the shutter 18 has an end portion 22 of a size substantially corresponding to the dimensional area of the keyway entrance opening 17, and closing that opening when shutter 18 is in a normal position.
  • a tapered surface 23 on shutter 18 will enable a key K to slide the shutter from its normal position so that the key may pass into the keyway 15, as indicated in dot and dash lines in FIG. 3.
  • the rib 20 of the shutter 18 has a switch actuating part 24 that will move in a clearance space 25 in cylinder 11 when shutter 18 slides from its normal position closing the keyway entrance opening 17.
  • the clearance space 25 is extended to form a circular inner groove 26 in cylinder 11. That groove 26 will offer clearance for rotation of the switch actuating part 24 of the shutter when key plug 12 rotates as shown in FIG. 6.
  • the switch 13 includes a contact spring arm 27 normally in open circuit relation to a contact arm 28, and having an actuating part 29 in opposed relation to the actuating part 24 on the shutter.
  • the arrangement is such that spring arm 27 presses the shutter 18 to its normal position, and will yield so that the switch 13 will close a circuit when shutter 18 moves from its normal position, as shown by dot and dash lines in FIG. 3.
  • the actuating part 29 on the spring arm 27 of the switch will move into clearance space 25 while the actuating part 24 moves in groove 26, so that switch 13 will be in open circuit unactuated position.
  • the shutter 18 can effect an alarm signal that has a short duration, and the importance of this will appear as the description proceeds.
  • the numeral 30 indicates an electric time delay circuit connected to a current source 31, and controlled by an alarm input signal that will be applied when a circuit is completed through the contact arms 27, 28 of switch 13.
  • the delay circuit 30 is a type having a time cycle running so long as there is an input signal, and cancelling the entire cycle when the input signal ceases.
  • switch 13 applies an input signal for a predetermined time
  • the time delay 30 will offer a signal that actuates a holding circuit 32 powered by the current source 31. Once actuated, holding circuit 32 will energize and maintain an alarm 33 energized.
  • the shutter 18 normally extends across and closes the keyway entrance opening 17, obstructing access to the keyway so that shutter 18 must move 7 from normal position before any one of the tumblers 14 can be moved by an instrument that may be inserted into the keyway, whether it be a proper key, an improper key. or a picking instrument.
  • the movement of the shutter 18 will immediately actuate switch 13, starting the predetermined time cycle of time delay 30. That time cycle will have a predetermined duration that may be rather short because a key that moves the shutter 18, if a proper key, will be able to rotate the key plug 12 so that switch 13 very soon moves to unactuated position, cancelling the time cycle.
  • the time cycle will allow insufficient time to pick any one of the tumblers, should the instrument that is present in the keyway be a picking instrument, and the alarm 33 will be actuated. Should the instrument be a key but not a proper one, it cannot rotate the key plug 12 and therefore the alarm will be actuated if the person using the key does not soon recognize that it will not operate, or if he takes the time to attempt release by vibrating the key.
  • our invention will offer an alarm that will very effectively indicate an improper attempt to operate a lock cylinder. It is important to observe also that the invention will be utilized effectively in those cases in which it is desired that there be an alarm that operates when a key is improperly left in the keyway. Thus, a key remaining in the keyway 15 will hold switch 13 in actuated position, causing alarm 33 to operate unless the key is promptly withdrawn from the keyway. In such cases it may be preferred that the alarm 33 should cease operation when the key has been withdrawn. and therefore we do not wish to limit our invention by a holding circuit.
  • FIG. 7 shows a further form of the invention, in which a cylinder assembly comprises a shutter 118 for the keyway entrance opening 117, and held assembled by a relatively thick cover member 121. That cover member 121 is riveted in position forming an integral part of the front portion 116, and has an opening which forms a part of the entrance opening 117.
  • the cylinder 111, switch 113, tumblers 114 and keyway 115 may be quite similar to those already described, and the shutter 118 is mounted to slide in a clearance space on the front portion 116 of the key plug 112.
  • the shutter 118 has an end portion 122 that closes entrance opening 117 in the normal position of the shutter, and an opposed end 124 of the shutter is formed to lie some distance inwardly from the peripheral surface of key plug 112.
  • the end 124 of the shutter forms an actuating surface for moving a part 129 on switch arm 127 so as to actuate switch 113.
  • the front portion 116 of the key plug is formed with a circular clearance groove 126a that enables switch arm 127 to move to unactuated position when key plug 112 rotates, and cylinder 111 has an inner groove 126 offering clearance for shutter 118.
  • FIG. 8 shows a form of the invention in which a cylinder assembly 210 has a shutter 218 that is mounted for pivotal movement.
  • Shutter 218 has a portion 222 normally closing the keyway entrance opening 217 on a front portion 216 of key plug 212, and is mounted through pivot means 219 on the front portion 216.
  • the shutter portion 222 normally rests against the inner surface of a scalp 221, and the shutter has a cam portion 224 coacting with the actuating lever 35 mounted on key plug 212.
  • Switch 213 has an actuating part 229 extending normally within the periphery of key plug 12 and in opposed relation to lever 35.
  • the switch on the cylinder will be actuated during rotating movement of the key plug, due to a movement of the back of the key against the actuating part of the switch.
  • the keys to be used may be formed as shown in FIG. 9.
  • the back edge of a key L will be cut to form a notch 34 that will be in aligned relation to a clearance groove, as for example the groove 126a in FIG. 7, so that the key when rotating will not engage the actuating part of the switch.
  • a lock tumbler cylinder assembly having a key plug that is mounted for movement in a bore ofa cylinder, a front portion of the key plug having an opening that forms an entrance to a longitudinal keyway in the key plug, and a series of plug locking tumblers in position rearwardly of the front portion on the key plug and controlled by a key that may be inserted through the keyway entrance opening into the keyway
  • the improvement that comprises a movable keyway guard member extending across said keyway to substantially cover the entire opening of said keyway in a first position and being movable by the insertion of said key to a second position away from said keyway to provide access to said keyway for said key, said guard member normally being spring pressed to said first position extending across said keyway entrance opening, means mounting said guard member to yield from said first position to said second position in a direction transverse to said entrance opening on the cylinder assembly when an instrument is inserted through said opening into the keyway, an electric switch mounted on an outer portion of the cylinder, and actuating means through which said guard member
  • a lock tumbler cylinder assembly having a key plug that is mounted for movement in a bore of a cylinder, a front portion of the key plug having an opening that forms an entrance to a longitudinal keyway in the key plug, and a series of plug locking tumblers in posi tion rearwardly of the front portion on the key plug and controlled by a key that may be inserted through the keyway entrance opening into the keyway, the improvement that comprises a keyway guard member normally spring pressed to a position extending across said keyway entrance opening, means mounting said guard member to yield in a direction transverse to said entrance opening on the cylinder assembly when an instrument is inserted through said opening into the keyway, an electric switch mounted on an outer portion of the cylinder, and actuating means through which said guard member acts when yielding to actuate said switch for offering an electric alarm signal prior to control of any one of the tumblers by an instrument that may move into the keyway, said guard member being a shutter mounted on said front portion of the key plug and comprising a portion that has a size
  • switch actuating means comprise portions mounted on said key plug and said cylinder and coacting to actuate the switch upon yielding movement of said shutter from a position closing the keyway entrance to a position opening the keyway entrance.
  • switch actuating means comprise portions mounted on said key plug and said cylinder and coacting to actuate the switch upon yielding movement of said guard member from said first position extending across the keyway entrance to said second position opening the keyway entrance.
  • guard member is a shutter comprising a portion that has a size substantially corresponding to the dimen sional area of the keyway entrance opening and closing said opening when the shutter is in its position extending across said opening.
  • switch actuating means comprise a cam surface on said shutter, and said switch having a spring arm moved by pressure applied through said cam surface to actuate the switch upon pivotal movement of said shutter from position closing the keyway entrance opening.

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  • Lock And Its Accessories (AREA)
  • Burglar Alarm Systems (AREA)
US00201690A 1971-11-24 1971-11-24 Lock tumbler cylinder picking alarm Expired - Lifetime US3797004A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US20169071A 1971-11-24 1971-11-24

Publications (1)

Publication Number Publication Date
US3797004A true US3797004A (en) 1974-03-12

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Family Applications (1)

Application Number Title Priority Date Filing Date
US00201690A Expired - Lifetime US3797004A (en) 1971-11-24 1971-11-24 Lock tumbler cylinder picking alarm

Country Status (4)

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US (1) US3797004A (it)
JP (1) JPS4859997A (it)
DE (1) DE2257621A1 (it)
IT (1) IT970871B (it)

Cited By (18)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3967481A (en) * 1974-12-30 1976-07-06 Schlage Lock Company Detector cylinder
US4303909A (en) * 1979-10-18 1981-12-01 James A. Martin Electronically alarmed lock
US4635035A (en) * 1984-03-20 1987-01-06 Moshe Ratzabi Vehicle automatic switching burglar alarm
US4983950A (en) * 1988-06-21 1991-01-08 Sadakatsu Sunami Car theft proofing system
US5309743A (en) * 1991-07-23 1994-05-10 Kabushiki Kaisha Tokai Rika Denki Seisakusho Door unlocking device
US5927112A (en) * 1996-03-26 1999-07-27 Honda Giken Kogyo Kabushiki Kaisha Theft detection mechanism and anti-theft device for vehicle
US6598439B1 (en) * 2002-10-15 2003-07-29 Ez Trend Technology Co., Ltd. Lock-and-alarm assembly
US6761051B1 (en) 2003-02-27 2004-07-13 Ez Trend Technology Co., Ltd. Electric padlock
US20040177660A1 (en) * 2003-03-14 2004-09-16 Hung-Cheng Tsai Electric door lock with a coupling mechanism for selective engagement between a deadbolt operating spindle and a door handle
US20040178909A1 (en) * 2003-02-27 2004-09-16 Li-Yun Lu Electronic lock apparatus with automatic locking capability
US20040207214A1 (en) * 2003-04-16 2004-10-21 Yi-An Lin Electronic door lock
US20040245785A1 (en) * 2003-06-03 2004-12-09 Fang-Kun Chen Electric door lock with a coupling mechanism for selective engagement between a deadbolt operating spindle and an electric driving motor unit
WO2009025630A1 (en) * 2007-08-22 2009-02-26 Aytul Cakir Lock alert mechanism
US8453481B2 (en) 2010-07-15 2013-06-04 Master Lock Company Llc Padlock
US20130233031A1 (en) * 2010-06-30 2013-09-12 Valeo Securite Habitacle Disengageable lock
US8806907B2 (en) 2011-11-11 2014-08-19 Master Lock Company Llc Battery access and power supply arrangements
US8850858B2 (en) 2012-12-06 2014-10-07 Master Lock Company Llc Lock subassembly
US20160082924A1 (en) * 2013-05-15 2016-03-24 Thyssenkrupp Presta Ag Steering wheel lock

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2853655A1 (de) * 1978-12-13 1980-07-03 Egon Gelhard Zylinderschloss mit schluessel zur mechanischen und/oder elektromechanischen verriegelung
FR2597141B1 (fr) * 1986-04-14 1988-10-14 Gonzalez Roger Serrure munie d'un systeme de detection d'effraction
DE3731154C1 (de) * 1987-09-17 1989-03-16 Merk Gmbh Telefonbau Fried Sperr- und Blockschloss mit einem schluesselbetaetigten Riegel

Cited By (20)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3967481A (en) * 1974-12-30 1976-07-06 Schlage Lock Company Detector cylinder
US4303909A (en) * 1979-10-18 1981-12-01 James A. Martin Electronically alarmed lock
US4635035A (en) * 1984-03-20 1987-01-06 Moshe Ratzabi Vehicle automatic switching burglar alarm
US4983950A (en) * 1988-06-21 1991-01-08 Sadakatsu Sunami Car theft proofing system
US5309743A (en) * 1991-07-23 1994-05-10 Kabushiki Kaisha Tokai Rika Denki Seisakusho Door unlocking device
US5927112A (en) * 1996-03-26 1999-07-27 Honda Giken Kogyo Kabushiki Kaisha Theft detection mechanism and anti-theft device for vehicle
US6598439B1 (en) * 2002-10-15 2003-07-29 Ez Trend Technology Co., Ltd. Lock-and-alarm assembly
US6761051B1 (en) 2003-02-27 2004-07-13 Ez Trend Technology Co., Ltd. Electric padlock
US20040178909A1 (en) * 2003-02-27 2004-09-16 Li-Yun Lu Electronic lock apparatus with automatic locking capability
US6807834B2 (en) 2003-03-14 2004-10-26 Ez Trend Technology Co, Ltd. Electric door lock with a coupling mechanism for selective engagement between a deadbolt operating spindle and a door handle
US20040177660A1 (en) * 2003-03-14 2004-09-16 Hung-Cheng Tsai Electric door lock with a coupling mechanism for selective engagement between a deadbolt operating spindle and a door handle
US20040207214A1 (en) * 2003-04-16 2004-10-21 Yi-An Lin Electronic door lock
US20040245785A1 (en) * 2003-06-03 2004-12-09 Fang-Kun Chen Electric door lock with a coupling mechanism for selective engagement between a deadbolt operating spindle and an electric driving motor unit
WO2009025630A1 (en) * 2007-08-22 2009-02-26 Aytul Cakir Lock alert mechanism
US20130233031A1 (en) * 2010-06-30 2013-09-12 Valeo Securite Habitacle Disengageable lock
US9133648B2 (en) * 2010-06-30 2015-09-15 U-Shin France Sas Disengageable lock
US8453481B2 (en) 2010-07-15 2013-06-04 Master Lock Company Llc Padlock
US8806907B2 (en) 2011-11-11 2014-08-19 Master Lock Company Llc Battery access and power supply arrangements
US8850858B2 (en) 2012-12-06 2014-10-07 Master Lock Company Llc Lock subassembly
US20160082924A1 (en) * 2013-05-15 2016-03-24 Thyssenkrupp Presta Ag Steering wheel lock

Also Published As

Publication number Publication date
IT970871B (it) 1974-04-20
JPS4859997A (it) 1973-08-22
DE2257621A1 (de) 1973-05-30

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AS Assignment

Owner name: YALE SECURITY INC., OLD CHARLOTTE HIGHWAY AT AIRPO

Free format text: ASSIGNMENT OF ASSIGNORS INTEREST.;ASSIGNOR:SCOVILL INC.;REEL/FRAME:004485/0690

Effective date: 19851028