A dual lock apparatus

0001The present invention relates to a dual lock apparatus, and in particular, to a dual lock apparatus that has at least two independent means of acting on a lock whereby operation of the two locking means is controlled by an improved clutch mechanism.

BACKGROUND OF THE INVENTION

0002<patcit id="pcit0001" dnum="WO0188315A"><text>WO 01/88315</text></patcit> discloses a lock arrangement including a first locking means adapted to operate the lock to lock and unlock the lock and a second locking means including a member movable between a first and a second position wherein when the member is in the first position the lock is locked and when in the second position the lock is unlocked. The first locking means is key operated and the second locking means is driven by an electric motor.Although the apparatus as described in the aforementioned patent has been found to function satisfactorily, an improved clutch mechanism which allows the two locking mechanisms to function independently has been developed and is the subject of the present application.

0003There are numerous types of locks in existence today that are used to secure various devices. One of the more common uses of locks is in relation to doors. Typically door locks have a bolt that can be extended from a locking mechanism so as to engage a doorframe or furniture with the bolts being driven by the use of a unique or slave key. There have also been developed locks that are not only operable by the use of the slave key but also a master key, allowing the master key holder, for example, to operate all doors in a pre-defined area whilst the slave key holders are limited to being able to operate specific doors only. This however requires the master key and the slave key to be of the same type thus potentially compromising security.

0004There have also been developed electromechanical locks that use an electric motor to drive the bolt. The difficulty with these types of arrangements is that if the electric motor was for whatever reason inoperable, the door may be left either in the unlocked or locked state and may require disassembly to be fixed.

0005Further still, the difficulty with some existing locks is that although the door may be unlocked, that is it may be opened, the bolt still engages a portion of the door frame and further manual operation of the bolt by the use of a handle is required to be able to open the door. On the other hand, if the bolt was to be retracted fully, then the door may swing freely, also an undesirable effect.

0006It is an object of the present invention to propose a locking apparatus that overcomes at least some of the abovementioned problems or provides the public with a useful alternative.

0007Although the present specification discusses doors in particular it is to be understood that the present invention is not intended to be limited to doors and may equally well be used to provide a locking apparatus in relation to other devices such as safes and gates to name but two.

SUMMARY OF THE INVENTION

0008In one form of the invention there is proposed a dual lock apparatus of the type including a locking bolt moveable between a first position whereby said lock extends outwardly from said apparatus and a second position whereby said locking bolt is contained within said apparatus said apparatus including: <ul id="ul0001" list-style="none" compact="compact"><li>a slider movable between a first position and a second position and including a first end associated with said locking bolt such that movement of the slider causes corresponding movement of the locking bolt , and a second end associated with a first locking means and a second locking means whereby independent operation of said first and second locking means is controlled by a clutch mechanism;</li><li>said clutch mechanism including an aperture which extends through said slider and a piston movable between at least a first and second position within said slider aperture; said second locking means including a member movable between a first and a second position said member including an outwardly biased locking member adapted to engage said slider aperture to thereby mechanically connect said second locking means with said slider to thereby effect movement of said slider upon movement of said member; said first locking means including a rotatable cam such that when rotated said cam acts against said piston to thereby move said piston from said first position to said second position to thereby mechanically connect said first locking means with said slider to thereby effect movement of said slider.</li></ul>

0009Preferably said first locking means disengages said second locking means.

0010This allows independent operation of said first locking means with respect to said second locking means.

0011The above provides the advantage that if the second locking means is one that may be exposed to potential failure, the first locking means ensures that there is a safeguard in that the lock can always be operated even if the secondary locking means has ceased to function.

0012Advantageously at least one of said locking means is electrically driven.

0013Advantageously said first locking means is a key activated locking means whilst said second locking means is an electromechanical locking means.

0014Preferably both said first and second locking means are key activated.

0015A particularly apt use of this invention is in the case where the electromechanical locking means is controlled by remote activation of an electric motor. If for whatever reason the electric motor were to fail, such as a power failure, then the primary locking mechanism that is operated for example by a key may be used to unlock or lock the lock.

0016Advantageously when said slider interacts with said locking bolt so as to move it into said first position said slider resists withdrawal of said locking bolt.

BRIEF DESCRIPTION OF THE DRAWINGS

0017The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate several implementations or embodiments of the invention and, together with the description, serve to explain the advantages and principles of the invention. In the drawings, <dl id="dl0001"><dt>Figure 1</dt><dd>is a top view of the internal components of a lock in an unlocked configuration and including the lock slider body of the present invention;</dd><dt>Figure 2</dt><dd>is a top view of the internal components of the lock of <figref idref="f0001">Figure 1</figref> in a locked configuration using a secondary locking mechanism, more specifically, an electric motor and rack system;</dd><dt>Figure 3</dt><dd>is an exploded perspective view of the different components of the lock of <figref idref="f0001">Figure 1</figref>;</dd><dt>Figure 4</dt><dd>is an alternate exploded perspective view of the different components of the lock of <figref idref="f0001">Figure 1</figref>;</dd><dt>Figure 5</dt><dd>is a cross-sectional view of the main component of the lock of <figref idref="f0001">Figure 1</figref> whereby the secondary locking mechanism is used to lock the bolt;</dd><dt>Figure 6</dt><dd>is a cross-sectional view of the main component of the lock of <figref idref="f0001">Figure 1</figref> whereby a primary locking mechanism (a key operated cam) disengages the secondary locking mechanism;</dd><dt>Figure 7</dt><dd>is a cross-sectional view of the lock as in <figref idref="f0005">Figure 6</figref> whereby the primary locking mechanism is used to lock the bolt subsequent to disengagement of the secondary locking mechanism;</dd><dt>Figure 8</dt><dd>is a cross-sectional view of the main components of the lock of <figref idref="f0001">Figure 1</figref> whereby the lock is in its fully locked state using the primary locking mechanism; and</dd><dt>Figure 9</dt><dd>is a cross-sectional view of the main components of the lock of <figref idref="f0001">Figure 1</figref> whereby the lock is in its fully unlocked state using the primary locking mechanism.</dd></dl>

DESCRIPTION OF THE PREFERRED EMBODIMENTS

0018The following detailed description of the invention refers to the accompanying drawings. Wherever possible, the same reference numbers will be used throughout the drawings and the following description to refer to the same and like parts.

0019The present invention relates to locks and in particular to locks that are used for hollow winged aluminium doors and the like. It may also be adapted to be used on other type of doors such as sliding doors. It is not intended to limit the invention to any particular type of lock or door.

0020Shown in <figref idref="f0001">Figures 1</figref> and <figref idref="f0002">2</figref> is a dual lock 10 in accordance with the present invention, <figref idref="f0001">Figure 1</figref> illustrating the lock 10 in its locked state and <figref idref="f0002">Figure 2</figref> showing the lock 10 in its unlocked state. <figref idref="f0001">Figures 1</figref> and <figref idref="f0002">2</figref> illustrate the use of a secondary locking mechanism, that is, the use of an electric motor (not shown) to lock or unlock the lock 10 and which will be described hereinbelow. The primary locking mechanism which is slightly more complex will also be described.

0021A casing 12 is adapted to slidingly support a locking bolt 14 said bolt 14 being biased outwardly from said casing 12 by the use of a spring (not shown). The bolt 14 includes a sunken shoulder 16 at one side of the bolt rear end, said shoulder supporting an annular projection 18. The bolt 14 is adapted to slide generally in a perpendicular axis 20 to the longitudinal axis 22 of the casing 12. A lock case 24 limits the outward movement of said bolt.

0022A slider 26 is adapted to slide along the longitudinal direction 22 within the casing 12 and includes a first longitudinal slit 28 engaging a screw 30, the screw 30 providing holding support for the lock 10.

0023The slider 26 includes a second slit 32 extending at an inclined direction to both the perpendicular and the longitudinal axis 20 and 22 respectively. Slit 32 engages projection 18 of the shoulder 16. One can thus appreciate that when the slider is moved towards the bolt, the inclination of the slit 32 causes the bolt 14 to be extended outwardly from said casing 12. Conversely when the slider 26 is moved in a direction away from the bolt 14, the slit 32 acting on the shoulder projection 18 urges the bolt 14 to be withdrawn into the casing 12. When locked, the slider 26 is maintained through use of a biasing member 34, which may be indexed with a recess in the lid (not shown), for example.

0024The slider 26 may further include a shoulder 36 adapted to abut against face 38 in the casing 12 to act as a dead stop for the slider motion.

0025The end of the slit 32 where the bolt is caused to extend out of said casing includes a hooked portion 40 where the slit extends in a longitudinal direction parallel to the casing and thus perpendicular to the movement of the bolt. This has the advantage that when the projection 18 is located within the hooked location 40, the slider effectively deadbolts the bolt. That is, if the bolt experiences an inward force, the edge 42 of the hooked portion 40 of the slit 32 engages the projection 18 and prevents the bolt 14 from moving into the casing 12. To keep the projection steady within the hooked portion the slit may include a slight annular recess (not shown).

0026It is the slider 26 that provides the motion for the movement of the bolt 14 into and outward of the casing 12. To enable the slider 26 to be movable by both the primary (key) and secondary (electric motor) locking mechanisms requires a clutch mechanism that is now described.

0027The secondary locking means includes a rack 44 that is adapted to engage the slider 26. The rack 44 includes at one end splines 46 that are driven by a gear 48 rotatably driven by an electric motor (not shown). The other end of the rack includes a generally oval-shaped cavity 50 which extends only partially therethrough. An outwardly biased pin 52 is positioned within the cavity 50 such that in its rest position, it extends beyond 53 of the rack 44. The pin 52 contains a recess for housing the biasing member which in this case is a spring 54. These parts of the lock can be seen more clearly in the exploded views of <figref idref="f0003 f0004">Figures 3-4</figref>.

0028The slider 26 further includes an arm 56 with an aperture 58 extending therethrough. The aperture 58 is generally of the same shape as cavity 50 in rack 44. Housed within aperture 58 is a cap 60 including a tapered shoulder 62 terminating into a head 64. It should therefore be apparent that when aperture 58 and cavity 50 are coaxially aligned, pin 52 will be pushed through aperture 58 and abut the lower surface of cap 60. Arm 56 includes a recess 67 to allow for movement corresponding with the primary locking mechanism which will be later explained.

0029Further included is a carriage 68. Carriage 68 includes a carriage pocket 70 and carriage aperture 72 extending therethrough. A lock barrel or cylinder 74 rotatably fixed to the casing 12 includes a cam 76 that upon rotation of the key barrel is correspondingly rotated. The cam 76 is adapted to be housed within carriage aperture 72 and during the locking and unlocking processes, the cam 76 correspondingly follows the movement of the carriage 68. It is during this process that recess 67 is required to allow for the cam rotation. Carriage 68 is shiftable along slider 26 to the extent provided by a locking cavity 78 on arm position. As there is no force provided by cam 76, the cap 60 remains in the central position of the pocket 70 thereby allowing pin 52 to constantly abut surface 88. Then, on operation of the electric motor to unlock the bolt 14, the pin 52 acts on surface 90 of slider aperture 58 to shift the slider 26 in the opposite direction.

0030One can thus appreciate that the above operation, in using a secondary locking mechanism, is capable of locking and unlocking the lock 10 independent of the primary locking mechanism, that being operative use of the cam 76.

0031<figref idref="f0005 f0006 f0007">Figures 6-9</figref> illustrate the primary locking mechanism which involves the use of a key being inserted into the key barrel and rotated, thereby rotating cam 76. More specifically, <figref idref="f0005">Figure 6</figref> illustrates the way the primary locking mechanism may function while the secondary locking mechanism is disengaged, <figref idref="f0006">Figure 7</figref> illustrates a continuation of this same locking action, while <figref idref="f0007">Figures 8 and 9</figref> illustrate the fully locked and fully unlocked configurations of the lock 10 respectively.

0032Those skilled in the art would appreciate that when cam 76 is rotated in order to lock the lock 10, it is caused to abut surface 92 of carriage aperture 72. Therefore, carriage 68 is forced to longitudinally shift relative to the slider 26. As can be seen in <figref idref="f0005">Figure 6</figref>, this action causes tapered surface 82 of carriage pocket 70 to push against tapered shoulder 62 of cap 60. Cap 60 is forced into its carriage frame and the tapered surfaces continue to slide until the side of head 64 of cap 60 abuts with surface 94 of pocket 70. This action not only causes pin 52 to be forced into cavity 50 due to the force applied by cap 60, but also provides for a mechanical connection between the cam 76 and the slider 26 to thereby shift the slider 26 with further rotation of the cam 76. Essentially, connection between the slider 26 and rack 44 is broken due to the resulting shear plane between rack and slider while connection between slider 26 and cam 76 is achieved.

0033With continued rotation of the cam 76, the bolt is drawn into the extended and deadlocked position. It is to be understood that the deadlocked configuration of the bolt 14 is not achieved through the primary locking mechanism but rather through pocket 40. If the primary locking mechanism did involve its own deadlocking feature, unlocking the bolt 14 using the secondary locking mechanism would not be possible. It should therefore be clear that the present invention provides for two independent means of locking and unlocking bolt 14.

0034When unlocking lock 10, that is to drive bolt 14 within the casing 12, the key is obviously rotated in the opposite direction. Therefore, cam 76 is forced to abut with surface 96 of carriage aperture 72 thereby causing carriage 68 to shift in the opposite direction as described above, with the cap 64 forced to abut the opposite surface of carriage pocket 70.

0035In the situation where the bolt has been unlocked using the primary locking mechanism and is required to be locked once again using the secondary locking mechanism, the electric motor when operated will drive the rack until the rack cavity 50 is co-axially aligned once again with slider aperture 58 such that spring 54 forces pin 52 back into abutment with cap 60 such that the slider 26 and rack 44 are now re-coupled for the electric motor to drive the lock.

0036One can thus appreciate how the present invention may be used to unlock a lock that has been locked by an electric motor that is still in the locked position. This is advantageous where the electric lock is to be over-ridden or where it has broken down. Use of the primary locking mechanism thus allows the lock to still operate even where the electric motor can no longer function.

0037It is to be understood that once the secondary locking mechanism has been disengaged, it remains motionless due to the gearing of the electric motor. Essentially, gearing back movement is prevented and thereby allows sufficient force to be applied to the slider to overcome tension that may be acting on the slider due to pin 52 which remains outwardly biased.

0038In a further aspect of the invention, the actions of the electric motor may well be governed by the use of a microprocessor in electrical connection with both the electrical motor and an arrangement of micro-switches which sense whether the slider is in a locked or unlocked position. The primary function of the processor is to process information gained from the micro-switches and to correspondingly operate the electric motor. One advantage to such a system over existing systems is that there is no longer the requirement for operating the motor for a predetermined amount of time to ensure that locking or unlocking has taken place and considerable battery power consumed in the process.

0039If under any circumstances the lock should fail to lock, the processor will realise that the lock is neither in a locked or unlocked state and sound an audible alarm to inform the user that the lock has not been successfully locked.

0040Further, the apparatus may well include a remote access means such as an infrared receiver such that locking and unlocking of the lock may be achieved from a remote location using a transmitting means. Further still, the apparatus may include an interrogation means so that a user may determine whether the bolt is in a locked or an unlocked position some distance away.

0041In some circumstances, a further bolt system may be engaged simultaneously with the dual lock of the present invention whereby the apparatus is in mechanical connection with one or more further bolts used to lock or unlock the door whereby the slider 28 is in mechanical connection with the bolts.

0042So as to keep the door from freely swinging when in the unlocked position, the lock mechanism may include a spring-loaded latch (not shown) being outwardly biased by a biasing means (not shown).

0043It is to be understood that other secondary driving means may equally well be employed. The rack may be acted upon by use of a manually operated crank (not shown).

0044In general the term deadlocking is intended to mean that when the lock is deadbolted, that the slider is effectively prevented from any slidable motion.

0045The above description generally referred to the slider being movable by a key activating the primary locking mechanism and an electric servomotor driving the secondary locking mechanism. It may equally well be, however, that the secondary locking mechanism is also activated by the use of a solenoid. However the electric motor provides much higher torques required especially where the lock arrangement includes multiple bolts such as additional upper and lower bolts. Even further still the secondary locking mechanism may also include a key activated lock accessible from one or both sides of the lock case or other types of simple non-secure actuators.

0046The present invention may also equally well be adapted for use on existing doors by the use of simple but effective adaptive pieces.

0047In any claims that follow and in the summary of the invention, except where the context requires otherwise due to express language or necessary implication, the word "comprising" is used in the sense of "including", i. e. the features specified may be associated with further features in various embodiments of the invention.