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Title:
LOCK CORE COMPLETE WITH LOCKING MECHANISM SEALED THEREIN
Document Type and Number:
WIPO Patent Application WO/2016/072832
Kind Code:
A1
Abstract:
The present invention relates generally to lock core (8) complete with detainer discs (14), isolators and other components of the locking mechanism sealed therein to facilitate the assembly of locks (2).

Inventors:
HENG AH LEK H NG BUCK CHUAN (MY)
TAN MIN CHOONG (MY)
Application Number:
PCT/MY2015/000089
Publication Date:
May 12, 2016
Filing Date:
October 30, 2015
Export Citation:
Click for automatic bibliography generation   Help
Assignee:
POWER INV S SDN BHD (MY)
International Classes:
E05B29/00
Foreign References:
US3695073A1972-10-03
US6185966B12001-02-13
JPS59203167A1984-11-17
Attorney, Agent or Firm:
WONG, Jan Ping (IPeople House7A Clove Hall Road, Penang, MY)
Download PDF:
Claims:
WHAT IS CLAIMED IS

1. Lock core (8) complete with locking mechanism (12) sealed therein comprising, at least a casing (8A); locking mechanism (12) comprising a plurality of typical detainer discs (14) with at least a gate each and a plurality isolators; characterized in that said casing (8A) is configured to have closed end (20) with a central aperture (22) and an open end (26) opposing the closed end (20); said casing (8A) is configured to have at least a side slot opening (24) provided on the curved surface of the said casing (8A); said casing (8A) is configured to have at least a pair of side casing apertures (8B) near the open end (26); further characterised in that at least a sealing member (16) having at least a pair of sealing member apertures (16 A) is provided to the open end (26) of said casing (8A) to seal up the said casing (8A).

2. Lock core (8) complete with locking mechanism sealed therein as claimed in Claim 1 further characterized in that said locking mechanism (12) includes at least a dual function detainer disc (30) provided with a dual function detainer disc gate (32).

3. Lock core (8) complete with locking mechanism (12) sealed therein as claimed in Claim 1 or 2 wherein said dual function detainer disc (30) comprises of at least driver disc (30A) and at least a retractable member (30B) detachably attached.

4. Lock core (8) complete with locking mechanism (12) sealed therein as claimed in Claim 1, 2 or 3 wherein said driver disc (30A) is similar to the configuration of typical detainer discs (14) save for being circumferentially depressed inwardly to create a shallow depth portion (38) and provided with at least a cut-out portion (36) partially cut from the circumferential edge of the driver disc (30 A) and said gate (32).

5. Lock core (8) complete with locking mechanism (12) sealed therein as claimed in Claim 1, 2 or 3 wherein the retractable member (24B) is configured to have a protrusion (34) flanked by two curved arms (40) to complement the circular configuration of the driver disc (30A), said curved sides (40) not meeting each other.

6. Lock core (8) complete with locking mechanism (12) sealed therein as claimed in Claim 1, 2, 3, 4 or 5 wherein the retractable member (30B) is a resilient element such as a wire, clip or tension spring.

7. Lock core (8) complete with locking mechanism (12) sealed therein as claimed in Claim 1 2, 5 or 6 wherein said protrusion (34) is caused to retract inwardly into the shallow depth portion (38) of said driver disc (30A) when it is caused to rotate against the lateral slot opening edge (25) by force.

8. Lock core (2) complete with locking mechanism (12) sealed therein as claimed in Claim 1 or 2 wherein said side slot opening (24) is made up of a longer longitudinal slot opening (24A) and a shorter lateral slot opening (24B);

9. Lock core (8) complete with locking mechanism (12) sealed therein as claimed in Claim 1, 2 or 8 wherein said shorter lateral slot opening (24B) is disposed adjacent to the said closed end (20) and arranged perpendicularly to said longer longitudinal slot opening (24A) forming a "T shaped" configuration.

10. Lock core (8) complete with locking mechanism (12) sealed therein as claimed in Claim 1, 2 or 8 wherein the shorter lateral slot opening (24B) is provided away from the closed end (20) to cut across said longer longitudinal slot opening (24A) forming a "cross road" configuration. 11. Lock core (8) complete with improved locking mechanism (12) sealed therein as claimed in Claim 1, 2 or 8 wherein the shorter lateral slot opening (24B) is configured to have a dimension that allows rotation of the dual function detainer disc gate (32) beyond the initial predetermined degree set for all gates of the detainer discs to align. 12. Lock core (8) complete with locking mechanism (12) sealed therein as claimed in Claim 1 and 2 wherein the dual function detainer disc gate (32) will be caused to rotate beyond the initial predetermined turn set for all gates to align to be perpetually off-position upon unauthorised manipulation of the lock mechanism (4). 13. Lock core (8) complete with locking mechanism (12) sealed therein as claimed in Claim 1 and 2 or 9 wherein the dual function detainer disc (30) is arranged adjacent to the said closed end (20) where said shorter lateral slot opening (24B) is located by being the first disc amongst other typical detainer discs (14) to be inserted into the said casing (8A).

14. Lock core (8) complete with locking mechanism (12) sealed therein as claimed in Claim 1 and 2 or 10 wherein the dual function detainer disc (30) is arranged adjacent to the lateral slot opening (24B) away from the closed end (20) by being the last disc to be inserted into the said casing (2A).

15. Lock core (8) complete with locking mechanism (12) sealed therein as claimed in Claim 1 wherein the open end (26) of said casing (8A) may be located at the top or bottom of the said casing (8 A) for detachable sealing.

16. Lock core (8) complete with locking mechanism (12) sealed therein as claimed in Claim 1 wherein frictional force derived from the contact between the detainer discs, isolators and said casing (2A) is employed to drive the lock mechanism (12) and lock core (8) into rotary movement.

Description:
LOCK CORE COMPLETE WITH LOCKING MECHANISM SEALED

THEREIN

1. TECHNICAL FIELD OF THE INVENTION

The present invention relates generally to lock cores complete with detainer discs, isolators and other components of the locking mechanism sealed therein to facilitate the assembly of locks.

2. BACKGROUND OF THE INVENTION

Man have invented and used locks to safeguard their possessions, jewelries, treasures, money and goods from thieves and unauthorized intrusion since several thousand years ago. Over the years after the first locks were invented engineers and lock designers continue to innovate and make improvements mainly with the objective of improving and enhancing the security features of the locks to prevent unauthorized access to guarded areas. The focus of this invention is on disc tumbler locks. A disc tumbler lock is a lock having locking mechanism comprising generally of rotating detainer discs provided with gates notched or cut on the circumference of the detainer discs, separated by isolators which are inserted therewithin the cylindrical casing of the lock core. A specially cut orbit key inserted into the key hole will rotate the discs of the locking mechanisms like tumblers of a safe to align the gates, allowing the side bar to drop into the aligned gates, thus enabling the lock core to turn which in turn unlocks the lock. The assembly of conventional disc tumbler locks is carried out according to the typical sequential order that is to assemble the whole lock from the beginning till the end including inserting the locking mechanism comprising amongst others detainer discs and isolators into the lock core which is not only tedious but requires much patience and dexterity contributing to increased assembly time which inevitably affects productivity. Bulk manufacture of lock cores complete with detainer discs intact is not feasible for conventional locks as the lock core and the activator members are manufactured as one integral component and hence different sizes of locks will require differing corresponding lock core cum activator member dimensions. The manufacturer cannot produce in bulk and stock up numerous types and sizes since different lock sizes require different lock core cum activator member dimensions and different types of locks require different activator configurations. The typical integral lock core cum activator component is generally not versatile to be mass produced to cater for any lock size or types. It would be advantageous if the lock cores can be of standardized dimension and pre-installed with the required locking mechanism and sealed up so that these sealed lock cores complete with locking mechanism intact can be made easily available when assembling locks. In this manner the time consuming task spent inserting each and every detainer disc, isolators and other components of the locking mechanism one after another into the lock core on the spot during assembly is dispensed with as the sealed lock core comes complete with the detainer discs and isolators and other components of the locking mechanism intact.

Disc tumbler locks are known to be more secure and difficult to pick as compared to other locks such as the wafer tumbler lock or a pin tumbler lock as disc tumbler locks do not use springs. Therefore judging from a security standpoint, the disc tumbler lock cannot be bumped and picking such a lock is time consuming, requires special skill and professional made tools. Such deterring factors have however failed to discourage the picking of disc tumbler locks and has thus prompted lock designers or manufacturers to introduce complex designs mostly utilizing a large number of detainer discs having gates at various angles, serrated front tumbler discs to create shallow "false gates" all aimed at increasing the time of picking a lock but all these deterring features have failed to provide an absolutely pick-proof lock. It would hence be advantageous if a lock which is capable of being absolutely pick-proof is made available. However even if the lock is capable of being absolutely pick-proof, most conventional locks would succumb to forced opening in the event the unauthorized person uses force to rotate the lock core which will not only damage the side bar but also other components of the lock. The whole lock will have to be replaced. It would hence be advantageous if a lock which has absolutely pick-proof and force-proof features is available.

To simplify the assembling process thereby reducing assembly time, the lock core, which is typically designed integral with the activator member is, in this present invention designed separate from the activator member as a two- part component with the lock core capable of being pre-installed with typical components of the locking mechanism and sealed up thereby maintaining the said inserted components therein the lock core intact. Such separated component design allows the lock core to acquire a standardized dimension whilst the dimension of the activator member is made variable to cater for the different size and types of the locks. In addition to overcome the shortcomings of conventional locks being violated an improved locking mechanism provided with at least a dual function detainer disc having anti-pick and anti-force characteristics may be included in the locking mechanism together with other typical detainer discs and sealed therein the lock core.

3. SUMMARY OF THE INVENTION Accordingly, it is the primary aim of the present invention to provide lock core complete with locking mechanism sealed therein which is capable of being manufactured as a standard size.

It is yet another object of the present invention to provide lock core complete with locking mechanism sealed therein which allows for all the components of the locking mechanism to be pre-installed prior to assembly of the whole lock.

Yet a further object of the present invention is to provide lock core complete with locking mechanism sealed therein wherein the casing of the lock core being separately manufactured from the activator as a separate two-part component allows for different sizes and types of locks to be catered by merely altering the dimension or configuration of the activator member to complement the lock size or type.

It is a further object of the present invention to provide lock core complete with locking mechanism sealed therein wherein the sealing member of the lock core is detachable.

It is a further object of the present invention to provide lock core complete with locking mechanism sealed therein wherein the sealing member may also act as the activator. It is another object of the present invention to provide lock core complete with locking mechanism sealed therein wherein the components of the locking mechanism will not drop out if the cover of the lock housing is removed (unlike conventional locks without such a sealed lock core) as they are secured within the lock core by the sealing member.

Yet a further object of the present invention is to provide lock core complete with locking mechanism sealed therein wherein a one size fits all lock core is possible thereby dispensing with the on-the-spot task of inserting each and every part of the disc mechanism into the lock core during assembly of locks. It is yet another object of the present invention to provide lock core complete with locking mechanism sealed therein which reduces assembly time and simplifies construction steps.

It is yet a further object of the present invention to provide lock core complete with locking mechanism sealed therein which can be manufactured in bulk and stocked up to be made available as and when required.

Yet another object of the present invention is to provide lock core complete with locking mechanism sealed therein wherein its manufacture can be outsourced to save production and/ or labor costs. It is a further object of the present invention to provide lock core complete with locking mechanism sealed therein wherein the said locking mechanism may be improved so as to be absolutely pick proof by having at least one gate capable of being rotated beyond the initial predetermined turn (advantageously 90 degrees) set for all gates to align thus causing the said gate to overshoot beyond the said limit upon unauthorized manipulation of the locking mechanism.

It is a further object of the present invention to provide lock core complete with lockmg mechanism sealed therein wherein upon manipulation of the locking mechanism using implements other than a correct key, the position of at least one gate will be perpetually off-position although the position of gates of all typical detainer discs are in alignment.

It is yet another object of the present invention to provide lock core complete with locking mechanism sealed therein wherein the said locking mechanism may be improved so as to be force proof by preventing forced rotary movement of the lock core during attempted forced opening of the lock by an implement other than a correct key.

Yet a further object of the present invention is to provide lock core complete with locking mechanism sealed therein wherein frictional force is used to drive the lock core or lock mechanism into rotary movement. It is yet another object of the present invention to provide lock core complete with improved locking mechanism sealed therein which is capable of being employed in several types of disc tumbler locks such as padlocks, lock cylinders, cam locks, rim locks to name a few. Other further objects of the invention will become apparent with an understanding of the following detailed description of the invention or upon employment of the invention in practice.

These and other objects of the present invention are achieved by,

Lock core (8) complete with locking mechanism (12) sealed therein comprising, at least a casing (8 A); locking mechanism (12) comprising a plurality of detainer discs (14) with at least a gate each and a plurality isolators; characterized in that said casing (8A) is configured to have a closed end (20) with a central aperture (22) and an open end (26) opposing the closed end (20); said casing (8A) is configured to have at least a side slot opening (24) provided on the curved surface of the said casing (8A); said casing (8A) is configured to have at least a pair of side casing apertures (8B) near the open end (26) to receive at least a fastener (18); further characterised in that at least a sealing member (16) having at least a pair of sealing member apertures (16 A) is provided to the open end (26) of said casing (8A) to seal up the said casing (8A).

4. BRIEF DESCRIPTION OF THE DRAWINGS

Other aspect of the present invention and their advantages will be discerned after studying the Detailed Description in conjunction with the accompanying drawings in which:

FIG. 1 is an exploded view of a lock showing the main components for insertion into the hollow compartment of the lock housing and a cover to retain the components intact. FIG. 2 shows an exploded view of the preferred embodiment of the present invention, a lock core complete with locking mechanism sealed therein by a detachable sealing member.

FIG 3A is an exploded view showing the components of the second embodiment of the lock core.

FIG. 3B is a cut-open view of the second embodiment of the lock core exposing the components therein.

FIG. 4A illustrates a three dimensional view of the dual function detainer disc with the retractable member attached to the driver disc. FIGS. 4B and 4C are views of the driver disc and the retractable member before attachment.

FIG. 5A is a side view of the second embodiment of the lock core with the sealing member and locking mechanism detached from the casing of the lock core. FIG. 5B is longitudinal cross-sectional view of FIG 5A with components pre-installed.

FIG. 6A is a side view of the lock core (8) provided with a "cross-road" side slot opening. FIG. 6B is longitudinal cross-sectional view of FIG 6A with pre-installed components intact

FIGS. 7 A to 7C show plan views of the dual function detainer disc arranged in relation to the side bar and casing of the said lock core illustrating the lock at its locked position, "ready-to-open" position and anti-pick position.

FIG. 8 shows a plan view of the dual function detainer disc showing the position of the retractable member when force is applied to open the lock.

5. DETAILED DESCRIPTION OF THE DRAWINGS

In the following detailed description, numerous specific details are set forth in order to provide a thorough understanding of the invention. However, it will be understood by those with ordinary skill in the art that the invention may be practised without these specific details. In other instances, well known methods, procedures and/ or components have not been described in detail so as not to obscure the invention. The invention will be more clearly understood from the following description of the embodiments thereof, given by way of example only with reference to the accompanying drawings, which are not drawn to scale. Referring to FIG. 1, there is shown an exploded view of a lock (2) showing the main components namely side bar (6) and the lock core (8) for insertion into the hollow compartment (4A) of the lock housing (4) and a cover (10) to secure the components therein intact Prior to insertion into the hollow compartment (4A) of the lock housing (4), the lock core (8) is pre-installed with locking mechanism (12) comprising detainers discs (14), isolators and relevant components which are pre-sealed to keep the said components intact The lock core (8) complete with the said locking mechanism (12) sealed therein is then inserted into the hollow compartment (4A) of the lock housing (4) together with the side bar (6) and other typical locking mechanism components. An outer cover (10) preferably a bush cover is employed to close up the opening of the hollow lock compartment to keep the components retained therein. The assembling of locks is fast and simplified by having such pre-installed standardized lock cores (8) as one of the tedious and time consuming tasks in the manufacture of locks is the precise insertion of the components of the locking mechanism into the lock core on the spot during assembly. The lock core with standardized dimension can hence fit all sizes of locks as the only change will be the dimension of the activator to complement the different lock sizes. By standardizing the lock core size, large numbers of lock core can be pre-installed with the required locking mechanism and sealed in bulk so that such time consuming and tedious step is dispensed with and replaced by the mere insertion of the sealed lock core complete with locking mechanism into the designated space of the lock housing (4) destined to accommodate the lock core (8) when assembling locks (2). This saves considerable time. Further bulk manufacturing of the sealed lock core (8) complete with locking mechanism intact is possible and can also be outsourced. In such a way large consignment of lock core (8) can be stocked up for future use. Further if the outer cover (10) is removed or detached from the lock housing (4), only the lock core (8) will drop out from the lock housing (4) but not the individual components of the locking mechanism (12) which, being sealed therein the lock core (8), remains securely intact. This eliminates the task of having to re-insert the components of the locking mechanism (12) into the lock core (8) should they drop out from the lock housing (4) after the outer cover (10) is removed as would have been inevitable in conventional models not provided with the said sealed lock core (8).

Referring to FIG. 2, there is shown an exploded view of the preferred embodiment of the present invention, that is a lock core (8) complete with locking mechanism (12) sealed therein by a detachable sealing member (16). As illustrated the present invention in its preferred embodiment comprises a casing (8A) preferably cylindrical in configuration, locking mechanism (12) and at least a sealing member (16). The said casing (8 A) is configured to have a closed end (20) having a central aperture (22), at least a side slot opening (24) on the curved surface of the said casing (8 A), an open end (26) opposing the closed end (20) and at least a pair of side casing apertures (8B) opposing each other located near the open end (26). The said closed end (20) holds the components including the locking mechanism (12) as they are being individually inserted. The locking mechanism (12) comprises amongst others a plurality of typical detainer discs (14) and isolators which are inserted into the said casing (8A) from the said open end (26). The said side slot opening (24) disposed on the longitudinal curved side of the said casing (8A) is made up of a longer longitudinal slot opening (24A) and a shorter lateral slot opening (24B) arranged perpendicularly to each other so as to form a "T" shape, such that the shorter lateral slot opening (24B) is disposed adjacent to the closed end (20). Alternatively instead of having the side slot opening (24) disposed as a "T-shaped" configuration as described above, the shorter lateral slot opening (24B) may be provided away from the closed end (20) to cut across the longer longitudinal slot opening (24 A) forming a "cross road" configuration. Upon the initial predetermined turn which is advantageously 90 degrees with the correct key being used, all the gates, the typical detainer discs (14) will come into alignment to form a groove enabling the side bar (6) which is attached to the lock housing (4) to drop into the said groove through the longer longitudinal slot opening (24A) to be in the "ready to open" position.

To secure the components therein the said casing (8A), the said open end (26) is sealed or plugged by a sealing member (16) which is further secured by at least a fastener (18). The sealing member (16) is provided with at least a pair of side sealing member apertures (16A) on opposing sides which are destined to match the said side casing apertures (8B). Once the sealing member (16) is fitted to the said open end (26) of said casing (8A), the side sealing member apertures (16A) will accordingly be aligned to match the side casing apertures (8B) to facilitate a fastener (18) to pass through. This will serve to secure the sealing member (16) to the said casing (8A) to prevent easy disengagement and retain the inserted components intact. The sealing member (16) can be easily attached or detached from the casing (8A) as and when required, so that the dimension of the sealing member (16) can be varied to cater for different lock sizes. As the sealing member (16) may also act as an activator, the shape and configuration of the sealing member cum activator can also be varied and combined with other known components, if required, to cater for different types of lock; for example, for cam locks, the sealing member cum activator is the combination of the sealing member (16), screw and plate and for lock cylinder, the sealing member cum activator is the combination of the sealing member (16), slate and rod. For padlocks as illustrated in the drawings, the sealing member cum activator is the sealing member (16) itself.

The sealing member (16) designed as a detachable and separate component allows versatility in that whilst the lock core (8) acquires a standardized dimension for bulk manufacturing or pre-installation of locking mechanism components, the sealing member (16) is varied in dimensions to complement the different lock sizes available or varied in shape and configuration and combined with other known components, if required, to cater for different lock types as described above. By standardizing the lock core size, large numbers of lock core (8) can be pre-installed with the required locking mechanism (12) and sealed thereby dispensing with the tedious and time consuming step of inserting each and every component of the locking mechanism (12) on the spot during assembly of locks.

Referring to FIGS. 3A and 3B, there are respectively shown an exploded view showing the components of the second embodiment of the lock core (8) and a cut-open view of the second embodiment of the lock core (8) exposing the components therein. In this second embodiment the locking mechanism (12) is improved by providing at least a dual function detainer disc (30) amongst the other main components such as typical detainer discs (14) and isolators, which are all inserted into the said casing (8A) from the said open end (26). The typical detainer discs (14) and dual function detainer disc (30) are collectively and generally referred to as "detainer discs". The dual function detainer disc (30) is configured to have anti-pick and anti-force characteristics. As illustrated in FIGS. 4A to 4C, three dimensional views of the dual function detainer disc (30) with the retractable member (30B) situate in the driver disc (30A) and in isolation are shown. The dual function detainer disc (30) comprises a driver disc (30A) and a retractable member (30B) which are detachable. It has dual function in that it prevents picking of locks by causing the dual function detainer disc gate (32) to overshoot the initial predetermined turn for all gates to align as well as preventing someone from forcing open the lock by causing the protrusion (34) of the retractable member (30B) to retract inwardly into the driver disc (30A) thereby allowing the locking mechanism (4) to rotate freely without turning the lock core (8). The workings will be explained in more detail below. The driver disc (30A) has the similar circular shape as the typical detainer disc (14) and provided with a gate and a central slot but is further provided with at least a cutout portion (36) partially cut from the circumferential edge of the driver disc (30A) preferably forrning a notch for the protrusion (34) of the retractable member (30B) to be accommodated. The driver disc (30 A) is circumferentially depressed inwardly to create a shallow depth portion (38) for accommodation of at least a retractable member (30B). The retractable member (30B) is advantageously a wire-like resilient element which is configured to have a protrusion (34) flanked by two curved arms (40), with the curved arms (40) not meeting each other, forming a shape substantially similar to that of a pair of callipers. The resilient nature of the retractable member (30B) facilitates its installation into the shallow depth portion (38) of the driver disc (30A), the curved arms (40) of the retractable member (30B) complementing the circular configuration of the driver disc (30A) which will not easily dislodge after attachment. The cut-out portion (36) is configured to accommodate the protrusion (34) of the retractable member (30B) for lodgment therein. Referring to FIGS. 5A and 5B, there are respectively shown a side view of the second embodiment of the lock core (8) with the sealing member (16) and locking mechanism (12) detached from the said casing (8A) of the lock core (8) and a longitudinal cross-sectional view of the second embodiment of the lock core (8) with components pre-installed. As illustrated, the locking mechanism (12) comprises a plurality of typical detainer discs (14) and at least a dual function detainer disc (30) enhanced with anti-pick and anti-force security features. The typical detainer discs (14) and the said dual function detainer disc (30) are all stacked-up and located therewithin the said casing (8A). The typical detainer disc (14) and the dual function detainer disc (30) are separated from each other by known isolators. Each detainer disc (14) and dual function detainer disc (30) is configured to have at least a gate notched at its circumference, for accommodation of the side bar (6) and a substantial central slot to accommodate the stem of the key. For the second embodiment having a "T-shaped" side slot opening (24) as described above, the dual function detainer disc (30) will be the first disc of the locking mechanism (12) to be inserted into the said casing (8A) followed by the insertion of the typical detainer discs (14) from the open end (26) of the said casing (8A) so that the dual function detainer disc (30) will be located adjacent to the said closed end (20) of the said casing (8A). Alternatively for the second embodiment having a "cross-road shaped" side slot opening (24) as described above (as illustrated in FIGS. 6A and 6B), the dual function detainer disc (30) will be the last piece of disc of the locking mechanism (12) to be inserted into the casing (8A) of the lock core (8) after all the typical detainer discs (14) had been inserted so that the dual function detainer disc (30) will be located away from the said closed end (20) of the said casing (8A). Following this sequential insertion of components into the said casing (8A), the dual function detainer disc (30) will be orientated to be at the same level as the position of the shorter lateral slot opening (24B), be it a "T-shaped" or "cross-road shaped" side slot opening (24). By having the dual function detainer disc (30) being orientated adjacent to the shorter lateral slot opening (24B) will enable the protrusion (34) of dual function detainer disc (30) to stick out from the lateral slot opening (24B). The said protrusion (34) serves as a limiting means preventing further rotation of the dual function detainer disc (30) after coming into contact with the edge of the shorter lateral slot opening (24B) [hereinafter referred to as "the lateral slot opening edge (25)] unless force is applied. The shorter lateral slot opening (24B) is configured with a dimension capable of allowing rotation of the dual function detainer disc gate (32) beyond the initial predetermined turn set for all gates of the detainer discs [typical detainer discs (14) as well dual function detainer disc (30)] to align (hereinafter referred to as "the initial predetermined turn"). Upon unauthorized manipulation of the locking mechanism (12), the dual function detainer disc (30) will be caused to rotate beyond the initial predetermined turn and when the said protrusion (34) meets the lateral slot opening edge (25) it is an indication that the gate of the dual function detainer disc (30) [this gate is hereinafter referred to as "dual function detainer disc gate (32)"] had overshot the said initial predetermined turn. Once the dual function detainer disc gate (32) has overshot the said initial predetermined turn, it will perpetually stay off- position and the side bar (6) will have no opportunity to drop and is prevented from being disengaged from the lock housing (4) as that act requires all the gates including the dual function detainer disc gate (32) to be aligned. Once off- position, the dual function detainer disc gate (32) cannot be recalled to the desired position and hence it is impossible to pick such a lock (2).

FIGS. 7 A to 7C show plan views of the dual function detainer disc (30) arranged in relation to the side bar (6) and casing (8A) of the said lock core (8) illustrating the lock at its locked position, open position and anti-pick position. When the lock is secured, the location of the dual function detainer disc gate (32), as with the gates of other typical detainer discs (14), is at an angle of 90 degrees from the side bar (6) [as illustrated in FIG. 7 A]. Upon a complete initial predetermined turn, preferably 90 degrees using the correct key, all gates of the typical detainer discs (14) and the dual function detainer disc gate (32) will be lined up to accommodate the side bar (6) thereby disengaging it from the lock housing (4) and be in the "ready -to-open position" [as illustrated in FIG. 7B]. Upon turning the correct key another subsequent predetermined turn, preferably another 90 degrees, the lock core (8) powered by frictional force will be rotated to open the lock. The frictional force generated from the contact between the typical detainer discs (14), the dual function detainer disc (30), isolators and the casing (8A) of the lock core (8) is used to drive the lock mechanism (12) and lock core (2) into rotary movement.

When someone manipulates the locking mechanism (12) using any tools or any implement other than a correct key in an attempt to pick the lock, the dual function detainer disc gate (32), unlike other typical detainer discs (14), will be caused by the action of picking the lock to be rotated beyond initial predetermined turn, preferably 90 degrees (as illustrated in FIG. 7C). Such rotation beyond the initial predetermined turn is facilitated by the dimension of the shorter lateral slot opening (24B) which is configured to allow for rotation of more than the preferred initial predetermined turn 90 degrees set for alignment of all gates before the dual function detainer disc (32) is prevented from further rotation upon the said protrusion (34) coming into contact with the said lateral slot opening edge (25). This means that the dual function detainer disc gate (32) has by being capable of rotating beyond the preferred initial predetermined turn of 90 degrees overshot its intended position of alignment. When the dual function detainer disc gate (32) has overshot the preferred initial predetermined turn of 90 degrees, it is not possible to manipulate the dual function detainer disc gate (32) to come into alignment with the rest of the gates of the typical detainer discs (14) that have already lined up and it will perpetually stay off-position. The dual function detainer disc gate (32) that has overshot cannot be recalled to the required position for alignment with the gates of the rest of the typical detainer discs (14). Hence the side bar (6) is not able to drop and be disengaged from the lock housing (4) to facilitate subsequent rotation of the lock core (8) to open the lock (2). In this respect it is impossible to successfully pick the lock (2) of this present invention as one of the gates, namely the dual function detainer disc gate (32) that has overshoot will perpetually stay off-position without any opportunity of being recalled to the intended or desired position. This enhanced security feature ensures that the lock (2) is absolutely pick-proof.

Another important feature disclosed in this invention is the anti-force security feature provided by the capability of the protrusion (34) of the retractable member (30B) of the dual function detainer disc (30) to retract inwardly when forced to rotate against a fixed part in this case the lateral slot opening edge (25). This will happen when someone attempts to force rotation of the lock core (8) regardless whether all gates are in alignment or not. As is shown in FIG. 4A the retractable member (30B) is located within the shallow depth portion (38) of the driver disc (30 A) while the protrusion (34) accommodated by the cut-out portion (36) protrudes from the said driver disc (30A) for lodgement with the lateral slot opening (24B). When unauthorised force is exerted in an attempt to illegally rotate the lock core (8), the forced turning of the protrusion (34) against the lateral slot opening edge (25) will cause it to retract inwardly into the shallow deptli portion (38) of the driver disc (30A) thereby allowing the locking mechanism (12) to rotate without rotating the lock core (8). After a cycle the resilient nature of the retractable member (3013) will cause the protrusion (34) to re-emerge from the said shallow depth portion (38) upon reaching the lateral slot opening (24B). The continual forced rotation will cause the protrusion (34) to be rotated against the lateral slot opening edge (25) and will once again retract inwardly into the shallow depth portion (38) to re-emerge upon reaching the lateral slot opening (24B). This cycle is repeated so long as there is continual unauthorized forced rotation and the lock mechanism (12) rotates freely leaving the lock core (8) constantly stationary. As it is the locking mechanism (12) that is rotating freely and not the lock core (8), it is impossible to force open such a lock (2) and there will be no damage to the side bar (6) and other lock components. This anti-force feature which permits free rotation of the locking mechanism (12) is illustrated in FIG. 8 which is a plan view of the dual function detainer disc (30) showing the inward retraction of the protrusion (34) of the retractable member (30B) into the shallow depth portion (38) of the driver disc (30A) when the protrusion (34) is made to rotate against the lateral slot opening edge (25) upon application of unauthorized force.

The above described and illustrated embodiments are capable of achieving absolute pick-proof and force proof security for several types of disc tumbler locks such as padlocks, lock cylinder, cam locks and rim locks to name a few. While the lock core (8) has been described and illustrated as having a casing (8A) with an open end at the top to be sealed by a detachable sealing member (16), the lock core (8) may be designed to have a casing (8 A) with an open end at the bottom to be sealed by a detachable sealing member (16) from the bottom.

Whilst the initial and subsequent predetermined turn of the discs of the locking mechanism to open the lock has been described and illustrated in some detail as preferably being 90 degrees, it will be appreciated that other angles are applicable as what is advantageous in accordance with the present invention is the fact that the invention is capable of providing a lock core (8) complete with improved locking mechanism having absolute pick proof and force-proof features sealed therein.

Although the retractable member (30B) is described and illustrated in some detail being a wire-like element, it can take other forms such as a clip or tension spring or any flexible element that can retract and extend as what is advantageous in accordance with the present invention is the fact that the retractable member (24B) is resilient and capable of retracting and extending according to required circumstances. While the preferred embodiment of the present invention and its advantages has been disclosed in the above Detailed Description, the invention is not Umited thereto but only by the scope of the appended claim.