US3783661A - Anti-pick lock assembly - Google Patents
Anti-pick lock assembly Download PDFInfo
- Publication number
- US3783661A US3783661A US00275218A US3783661DA US3783661A US 3783661 A US3783661 A US 3783661A US 00275218 A US00275218 A US 00275218A US 3783661D A US3783661D A US 3783661DA US 3783661 A US3783661 A US 3783661A
- Authority
- US
- United States
- Prior art keywords
- lock
- output member
- cam
- door
- pick
- 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
Links
Images
Classifications
-
- E—FIXED CONSTRUCTIONS
- E05—LOCKS; KEYS; WINDOW OR DOOR FITTINGS; SAFES
- E05B—LOCKS; ACCESSORIES THEREFOR; HANDCUFFS
- E05B27/00—Cylinder locks or other locks with tumbler pins or balls that are set by pushing the key in
- E05B27/02—Cylinder locks or other locks with tumbler pins or balls that are set by pushing the key in operated by the edge of the key
- E05B27/08—Cylinder locks or other locks with tumbler pins or balls that are set by pushing the key in operated by the edge of the key arranged axially
- E05B27/083—Cylinder locks or other locks with tumbler pins or balls that are set by pushing the key in operated by the edge of the key arranged axially of the split-pin tumbler type
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- 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
- Y10S70/36—Spring-returned lock cylinder
-
- 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
- Y10T292/00—Closure fasteners
- Y10T292/08—Bolts
- Y10T292/0801—Multiple
- Y10T292/0834—Sliding
- Y10T292/0836—Operating means
- Y10T292/084—Cam
-
- 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
- Y10T70/7915—Tampering prevention or attack defeating
- Y10T70/7932—Anti-pick
Definitions
- ABSTRACT An anti-pick lock assembly in which the rotor of a tumbler lock is biased toward its locking position by a torsion spring.
- the spring bias force is sufficient to prevent the tumbler rotor from being set at a displacement within the working tolerance of the internal lock parts that allows the code pins to be manipulated one at a time into their release positions by a pick tool.
- the present invention relates in general to lock devicesand more particularly to an anti-pick lock assembly in which a tumbler lock is resiliently biased against picking action.
- I-leretofore tumbler locks such as are commonly used on the coin boxes of vending machines and coinoperated appliances, have been vulnerable to picking.
- a technique frequently used by lock pickers was to maintain'the respective code pins set by applying a torque on the tumbler turning member until all code pins had been manipulated into their release positions by a pick tool. By doing this, a lock picker with an ordinary sense of touch could easily position each pin at its break free position so that the lock could be opened without a key.
- the movement allowed by the working tolerance of the component lock parts was sufficient to permit the picker to set free one or more of the code pins. By successfully performing operations a number of times, the picker could eventually set all pins and thereby open the lock.
- the invention provides a spring that is coupled to the rotor output member of the tumbler lock so as to bias it towards its locking position.
- the spring is arranged to give a preload return torque that is sufficient to overcome that which can be applied by a pick tool. In this way, the invention foils the lock picker by making it impossible to hold previously set pins in their break positions while the others are worked on in succession.
- One advantage of the invention is that it allows construction of pick-resistant locks without requiring closer, and more expensive, machining tolerances.
- FIG. 1 is an elevation cross-sectional view of a lock assembly constructed in accordance with a preferred embodiment of the invention, and shown as installed in the cover door of a coin box.
- FIG. 2 is a sectional view taken along line 2- 2 of FIG. 1 to show the back of the lock assembly and cover door.
- FIGS. 1 and 2 there is exemplified a lock assembly in which a tumbler lock unit 11 is received in a support means in the form of a cover door 12 for a coin box 13.
- Door 12 is connected as by screw fasteners 14 to a coin tray 15 that is slidably. received in coin box 13.
- lock members 16, 17, and 18 interconnected by slot-and-tongue means 19.
- the central lock member 16 is displaced outwardly by the turning of a cam 20 in contact with edge 21, the lock members 17 and 18 are simultaneously driven outwardly by the inclined wedge action of means 19.
- the outwardly displaced positions shown in FIGS. 1 and 2 for lock members 16, 17, 18 can be considered as their locking positions since the members 16, 17, 13 overlap the back of a lip 22 of coin box 13 to prevent pull-out of door 12 and coin tray 15.
- the front of lip 22 abuts a flange 23 on door 12.
- the lock members 16, 17, 18 are so arranged that they can be drawn back inwardly to unlocking positions which allow pull-out of door 12 by turning cam 20 in contact with an opposite edge 24 on lock member 16.
- Lock 11 is of prior art construction and is normally operated by a key (not shown) having a tubular code-milled sleeve that is received over a stud 33 pressed into a bore 34 of rotor 31 for rotation in unison therewith.
- the rotor 31 is locked against rotation relative to body 32 by a plurality of code pin assemblies 35.
- Each code pin assembly 35 has a two-piece code pin 36 that is axially slidable in a passage 37 extending in rotor 31 and aligned with a guide 38 seated in body 32 and containing a spring 39.
- Pin 36 has an inner section 36A and a separate but abutting outer section 368, the relative lengths of which sections 36A, 368 can vary from one assembly 35 to another in accordance with the intended key code.
- a corresponding milled surface on the key will engage the end of each pin section 36B and push the two sections 36A and 36B inward against spring 39 until the break plane 40 defined by the abutting ends of sections 36A, 36B is aligned with the interface plane 41 of rotor 31 and body 32. If the key is not the proper one, all of the code pins 36 will not be set at their respective break positions and the rotor 31 will not be free to turn.
- a tumbler lock 11 could be picked by applying a torque to rotor 31 to give a slight angular displacement within the internal working tolerances so that the friction on the pin section 36A is sufficient to overcome the force of spring 39, thereby allowing each code pin 36 to be set in succession by manipulating a pick tool (not shown), until all pins 36 were set at their break positions and rotor 31 could be turned.
- Rotor 31 actually can be considered as the output member of lock 11 in that the rotary movement of rotor 31 is used to drive cam 20 and impart movement to lock members 16, 17, 16.
- rotor 31 is provided with an extending threaded shaft 43 having opposing flat sides -12, which shaft 418 is passed through a matching cross-section hole in cam 20 and secured to cam 20 by a nut 413.
- Conventional means such as a plate having stop surfaces, are provided such that the rotary movement of rotor 31 is limited between one angular position that corresponds to the locked position, and a second angular position that corresponds to the unlocked position as referred to the lock members 16, 17, 18.
- the invention provides resilient means in the form of a spring 45 that biases rotor 31 for return movement to its locked position upon displacement therefrom toward its unlocked position.
- Spring 45 is expediently a coil spring, one end of which is received in a pocket 16 within door 12, and
- spring 45 is not connected directly to rotor 31, it is in actuality coupled thereto so as to exert thereon a biasing torque.
- spring 45 is compressed between the support door pocket 46 and arm 47 of cam so that there is a preload return torque applied to rotor 31 that is greater than any torque that could be applied by a conventional pick tool. This assures that upon attempting to set up successive code pins 36, the lock picker will not be able to keep any previously set pins 36 at their break positions while working on a next pin 36.
- An anti-pick lock assembly which comprises in combination a tumbler lock means in which an output member is secured in a locked position by the action of code pins and is moveable to an unlocked position by the action of an associated key; a door receiving and supporting said tumbler lock means; a plurality of lock members supported by said door and interconnected by slot-and tongue means for movement in unison between respective locking positions and unlocking positions to correspondingly lock and unlock the door; a cam connected to said output member for rotation thereby and therewith, said cam being disposed for engagement with one of said lock members to move all of said lock members in unison in accordance with the movement of the output member, to position all lock members in their respective locking positions when the output member is at its locked position and to position all lock members in their respective unlocking positions when the output member is at its unlocked position; and a spring compressed between said door and said cam to exert a preload torque upon the output member biasing said output member for return movement to its locked position upon displacement therefrom toward its unlocked position.
Landscapes
- Lock And Its Accessories (AREA)
Abstract
Description
Claims (2)
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US27521872A | 1972-07-26 | 1972-07-26 |
Publications (1)
Publication Number | Publication Date |
---|---|
US3783661A true US3783661A (en) | 1974-01-08 |
Family
ID=23051354
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US00275218A Expired - Lifetime US3783661A (en) | 1972-07-26 | 1972-07-26 | Anti-pick lock assembly |
Country Status (1)
Country | Link |
---|---|
US (1) | US3783661A (en) |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4038844A (en) * | 1975-07-24 | 1977-08-02 | Carlson Richard E | Pick proof money box |
GB2322403A (en) * | 1997-02-20 | 1998-08-26 | Camlock Systems Plc | Drill resistant lock and key combination |
US20130061644A1 (en) * | 2011-09-08 | 2013-03-14 | Medeco Security Locks, Inc. | Apparatus for automatically returning a lock to a desired orientation |
Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US1309439A (en) * | 1919-07-08 | keeper |
-
1972
- 1972-07-26 US US00275218A patent/US3783661A/en not_active Expired - Lifetime
Patent Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US1309439A (en) * | 1919-07-08 | keeper |
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4038844A (en) * | 1975-07-24 | 1977-08-02 | Carlson Richard E | Pick proof money box |
GB2322403A (en) * | 1997-02-20 | 1998-08-26 | Camlock Systems Plc | Drill resistant lock and key combination |
US20130061644A1 (en) * | 2011-09-08 | 2013-03-14 | Medeco Security Locks, Inc. | Apparatus for automatically returning a lock to a desired orientation |
US8978428B2 (en) * | 2011-09-08 | 2015-03-17 | Medeco Security Locks, Inc. | Apparatus for automatically returning a lock to a desired orientation |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
AS | Assignment |
Owner name: KIDDE, INC., NEW YORK Free format text: CHANGE OF NAME;ASSIGNOR:WALTER KIDDE & COMPANY, INC.;REEL/FRAME:003929/0640 Effective date: 19800416 Owner name: KIDDE, INC. Free format text: CHANGE OF NAME;ASSIGNOR:WALTER KIDDE & COMPANY, INC.;REEL/FRAME:003929/0640 Effective date: 19800416 |
|
AS | Assignment |
Owner name: GREENWALD INDUSTRIES INC. Free format text: CHANGE OF NAME;ASSIGNOR:GREENWALD INC., A CORP. OF DELAWARE;REEL/FRAME:005635/0098 Effective date: 19880414 Owner name: GREENWALD INC. Free format text: CHANGE OF NAME;ASSIGNOR:HKID 40 INC., A CORP. OF DELAWARE;REEL/FRAME:005635/0092 Effective date: 19880404 Owner name: HIMP - 2 INC., A CORP. OF DELAWARE Free format text: MERGER;ASSIGNOR:KIDDE, INC.;REEL/FRAME:005635/0083 Effective date: 19880331 Owner name: BLOOM-1 INC., A CORP. OF DELAWARE Free format text: MERGER;ASSIGNOR:KIDDE, INC.;REEL/FRAME:005635/0074 Effective date: 19880331 Owner name: HKID 40 INC., A CORP. OF DELAWARE Free format text: ASSIGNMENT OF ASSIGNORS INTEREST.;ASSIGNOR:KIDDE, INC., A CORP. OF DELAWARE;REEL/FRAME:005635/0068 Effective date: 19901205 |