GB2442734A - Pick resistant pin tumbler lock - Google Patents

Pick resistant pin tumbler lock Download PDF

Info

Publication number
GB2442734A
GB2442734A GB0619997A GB0619997A GB2442734A GB 2442734 A GB2442734 A GB 2442734A GB 0619997 A GB0619997 A GB 0619997A GB 0619997 A GB0619997 A GB 0619997A GB 2442734 A GB2442734 A GB 2442734A
Authority
GB
United Kingdom
Prior art keywords
lock
pin
pins
sacrificial
pin tumbler
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.)
Withdrawn
Application number
GB0619997A
Other versions
GB0619997D0 (en
Inventor
Peter Smith
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.)
Individual
Original Assignee
Individual
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 Individual filed Critical Individual
Priority to GB0619997A priority Critical patent/GB2442734A/en
Publication of GB0619997D0 publication Critical patent/GB0619997D0/en
Publication of GB2442734A publication Critical patent/GB2442734A/en
Withdrawn legal-status Critical Current

Links

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
    • E05B27/0003—Details
    • E05B27/0017—Tumblers or pins
    • 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
    • E05B27/0057—Cylinder locks or other locks with tumbler pins or balls that are set by pushing the key in with increased picking resistance

Landscapes

  • Lock And Its Accessories (AREA)

Abstract

A pin tumbler lock that in addition to the usual lock 6 and driver 3 pins, has an additional sacrificial pin 11 that is positioned to the spring 2 side of the lock's sheer point 4, such that it can absorb any sudden hit to the lock pin 6 by moving back against the spring. This ensures that the driver pin 3 remains across the lock's sheer line 4 to keep the mechanism in a locked state if an attempt is made to pick the lock by applying such a hit. The sacrificial pins 11 may be of denser material than the other pins and need not be pin-shaped.

Description

Pin Tumbler Lock
Background
This invention relates to a pin tumbler lock mechanism that resists the method of picking known as bumping.
A typical pin tumbler based lock consists of a fixed part and a movable part.
In the locked state, these parts are fixed together by one or more pins fitted in slots that cross the boundary between the two parts. This boundary is known as the "Sheer Point".
The pins (known as "Driver Pins") are normafly held in place with a spring pushing from one end whilst the other ends rest against corresponding "Key Pins".
The Key Pins are of various lengths such that when pushed up by the correct key, they in turn push the Driver Pins back against the springs such that the point at which the Key and Driver pins meet is directly lined up with the lock's Sheer Point. This means that the pins are no longer holding the movable part of the lock to the fixed part and it is free to move and open the lock.
The critical issue is that for the lock to open, the boundary between the Key and Driver pins matches with that between the fixed and movable lock parts.
The Current Problem An inherent problem with this type of locking mechanism is the phenomenon, governed by Newton's laws of physics where, if two objects are touching and one of them is then hit by another object, it is the object that was not hit that wilt move, whilst the struck object remains in place.
In the case of the Pin Tumbler type lock, this phenomenon can be exploited by arranging for all the Lock Pins to all be struck briefly at the same time, but not held up, thus causing them to remain where they are whilst the Driver Pins are forced back against the springs.
This causes the boundary between the Key and Driver pins to widen such that the Sheer Point will always be contained within this gap and the lock will be free to open.
The method of arranging for alt the Lock Pins to be struck simultaneously is usually accomplished using a specially modified key that is placed in the lock and then struck. This is known as bumping the lock.
Statement of Invention
The invention exploits the same phenomenon that causes the problem in the first place. Just as when two objects are touching, it is the non-struck object that will move, if a third object is placed touching the other side of the non-struck object, both of the original objects will now remain stationary whilst the third object is moved.
The invention is therefore to place a third, Sacrificial pin between the Driver pins and their springs. The lengths of these Sacrificial pins are such that the boundaries between them and their corresponding Driver Pins are always to the spring side of the lock's Sheer Point.
These Sacrificial pins could typically be made of a denser material than used for the Key or Driver pins such that they need not be as long whilst still being of a greater or equal mass.
In the event of someone trying to bump a lock of this design, both the Driver and Key pins will remain stationary, thus maintaining the integrity of the lock, with the Sacrificial pin being forced harmlessly back against the springs.

Claims (6)

  1. Claims 1. A pin tumbler lock with extra Sacrificial pins added within
    the pin slots such that they absorb any sudden force applied to the mechanism and thereby allow the "locked" state to be maintained.
  2. 2. The Sacrificial pins according to claim 1, may be made of a denser substance that the other pins such that it can be smaller but still equal or greater in mass
  3. 3. The Sacrificial pins according to claim 1, may be any shape so long as they do not jam the mechanism and remain completely above the Sheer point of the lock, they need not actually be "pin shaped".
  4. 4. To resist bumping, a lock need not have Sacrificial pins according to claim 1, added to all of its pin slots.
  5. 5. To resist bumping, a lock could have more than one Sacrificial pins according to claim 1, in each pin slot.
  6. 6. This invention covers any number of, any shape of Sacrificial pins in any number of pin slots.
GB0619997A 2006-10-10 2006-10-10 Pick resistant pin tumbler lock Withdrawn GB2442734A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB0619997A GB2442734A (en) 2006-10-10 2006-10-10 Pick resistant pin tumbler lock

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB0619997A GB2442734A (en) 2006-10-10 2006-10-10 Pick resistant pin tumbler lock

Publications (2)

Publication Number Publication Date
GB0619997D0 GB0619997D0 (en) 2006-11-15
GB2442734A true GB2442734A (en) 2008-04-16

Family

ID=37454286

Family Applications (1)

Application Number Title Priority Date Filing Date
GB0619997A Withdrawn GB2442734A (en) 2006-10-10 2006-10-10 Pick resistant pin tumbler lock

Country Status (1)

Country Link
GB (1) GB2442734A (en)

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2000063514A1 (en) * 1999-04-21 2000-10-26 Feder George N Pick resistant lock system and method
US20020189309A1 (en) * 1999-12-27 2002-12-19 Stemmerik Henrik Dirk Burglar-proof cylinder lock
EP1712715A1 (en) * 2005-04-15 2006-10-18 Aug. Winkhaus GmbH & Co. KG Lock cylinder

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2000063514A1 (en) * 1999-04-21 2000-10-26 Feder George N Pick resistant lock system and method
US20020189309A1 (en) * 1999-12-27 2002-12-19 Stemmerik Henrik Dirk Burglar-proof cylinder lock
EP1712715A1 (en) * 2005-04-15 2006-10-18 Aug. Winkhaus GmbH & Co. KG Lock cylinder

Also Published As

Publication number Publication date
GB0619997D0 (en) 2006-11-15

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Legal Events

Date Code Title Description
WAP Application withdrawn, taken to be withdrawn or refused ** after publication under section 16(1)