LOCK

Abstract: A lock which includes a bolt, a catch, a handle for manually moving the catch from an operative position to an inoperative position, first link means, and electrically actuable means for causing movement of the first link means between first and second positions, the first link means, at the said first position, translating movement of the handle in a first direction into movement of the bolt from a locked position to an unlocked position and, at the said second position, allowing handle movement in the said first direction without corresponding movement of the bolt.

Description: LOCK BACKGROUND OF THE INVENTION This invention relates to a lock of the type which includes a bolt and a catch A lock of the aforementioned kind is in general terms, in widespread use Normally the bolt and the catch are within separate enclosures although this is not necessarily the case The bolt is operable by means of a key, on an outer side of the door and a short twist lever or a key on an inner side of the door The bolt, when moved by the key or the lever, is moved to a retracted position to unlock the door The catch is movable by means of handles on the inner and outer sides of the door respectively The outer handle is lockable with a key and the inner handle is lockable with a twist lever or a key If either handle is locked then the handles cannot be turned to operate the catch Normally the catch has a memory, in the nature of a restoring spring, and is moved to its original position once either handle is released It is known to modify or adapt a lock of the aforementioned kind so that at least some of its functions can be controlled by means of remotely transmitted signal eg a radio or similar signal By way of example a remotely transmitted signal can be used to lock the bolt or unlock the bolt International application No PCT/ZA99/00116 describes a lock which stores energy when the bolt is moved manually to an unlocked position When a correctly encoded remotely transmitted signal is received by a receiver associated with the lock the energy is released and is used to move the bolt to the locked position The construction is such however that the bolt can be moved from the unlocked to the locked position ana vice versa by means of a key SUMMARY OF THE INVENTION The invention is concerned with a lock of the aforementioneα kind which lends itself to being actuated at least partly by electronic means The invention provides in the first instance a lock which includes a bolt a catch a handle for manually moving the catch from an operative position to an inoperative position first link means and electrically actuable means for causing movement of the first link means between first and second positions, the first link means at the said first position translating movement of the handle in a first direction into movement of the bolt from a locked position to an unlocked position and, at the saiα second position allowing handle movement in the said first direction without corresponding movement of the bolt The lock may include energy storage means which is operable to release energy which at least assists in moving the bolt from the unlocked position to the locked position The lock may include a catch mechanism for retaining the bolt in the unlocked position The said electrically actuable means may be operable to release the catch mechanism to allow the bolt to be moved from the unlocked position to the locked position preferably under the action of the energy storage means The lock may include an axle a hold lever which is rotatable about the axle an unlock lever which is fixed to and which is rotatable in unison with, the axle, and at least one formation on at least one of the hold lever and the unlock lever whereby rotation of the hold lever in a first direction causes rotation of the unlock lever in the first direction rotation of the hold lever in a second direction which is opposite to the first direction does not cause corresponding rotation of the unlock lever in the second direction, rotation of the unlock lever in the second direction causes corresponding rotation of the hold lever in the second direction and rotation of the unlock lever in the first direction does not cause corresponding rotation of the hold lever in the first direction a component of the first link means being connected to the hold lever and a component of the catch mechanism being connected to the unlock lever whereby movement of the first link component caused by movement of the hold lever in the second direction causes movement of the catch mechanism component from a retaining position to a non-retaining position The said electrically actuable means may be operable to cause movement of the component of the catch mechanism from the said retaining position to the said non- retaining position The lock may include a receiver and decoder which receive an externally generated signal from any appropriate source such as a card reader keypad, any suitable recognition device a radio transmitter or the like The scope of the invention is not limited in this regard If a correctly encoded signal or a valid signal is received then the retaining means may be moved in the manner described Communication with the lock may be uni-directional, or bi-directional e g in a "challenge- response ' routine or mode In each case a signal may be transmitted by a direct link or a wireless link from a source which is close to a lock or from a remote source e g a central control unit The signal could simultaneously actuate a number of locks A phone link, an Internet connection Bluetooth or any similar device or arrangement could be used to address the lock directly or through the medium of a control unit The lock may be capable of reporting or responding e g to a control unit or any actuating source through any appropriate medium directly or through a wireless Internet or other link The lock may for example report to an alarm system to indicate that a door is open or closed or possibly that the door has been forced open Where a plurality of locks are used a central system or an alarm system may be installed that can individually or collectively instruct the locks to lock and unlock The locks may report to the central system indicating information such as whether they have been successfully locked, and whether the respective doors are open or closed The central system may also communicate with other systems which may include garage doors to lock and unlock such doors and to check on their status such as open or closed The central system may be interfaced by a user αirectly or may be communicated with by the user via a telephone link the Internet or a satellite This communication may take place via a variety of mediums such as wired radio frequency and infrared links Single hand-held controllers may be used to lock a variety of locks with one button press or single locks with the press of another button or a code of button presses For certain buttons of the hand-held controller the power that is emitted may be higher than for other buttons of the same hand-held controller This makes it possible to limit the working range of some of the buttons on the hand-held controller and helps to prevent the accidental locking and unlocking of surrounding locks if a specific lock is to be locked and unlocked if a hand-held controller can lock and unlock more than one lock For hand-held controllers communication can take place via a variety of mediums, such as radio frequency and infrared links It is also possible to actuate the lock by means of any appropriate device e g a push button which is installed at a convenient and safe location and which may be linked directly to the lock It is possible to implement the principles of the invention on a retro-fit basis in that a kit can be provided to adapt existing installed locks to function in the manner which is described herein Obviously it is also possible to provide a custom-designed assembly of components which make up a lock according to the invention, for new installations It has however been found with a lock of the aforementioned type, particularly if the lock is not satisfactorily installed in a door that it is possible to retract the bolt and the catch from keeDS or retaining formations in a door frame with the bolt not being retained in a fully retracted position Under these conditions, with the door open, if the actuating handle is released the bolt will automatically move to an extended position, to which it is normally biased by means of a spring, and this will prevent the door from being closed for the bolt will strike against the door frame Another factor is that it is desirable, from the point of view of enhancing the security afforded by the lock, to be able to place the lock in a disabled mode in which it cannot be unlocked manually and, preferably, to be able to place the lock in this mode using electronic means These additional objectives may be achieved by designing the lock so that the said movement of the catch from the operative position to the inoperative position is linear movement the said movement of the bolt from the locked position to the unlocked position is linear movement and so that the said linear movement of the bolt is greater than the said linear movement of the catch With this second embodiment of the invention the said handle may be mounted to a catch axle and the first link means may include a catch lever which is mounted for rotation to the catch axle a bolt lever which is mounted for rotation to a bolt axle and a link which extends between a pivot point on the catch lever and a pivot point on the bolt lever To enable the linear movement of the bolt to be greater at least initially, than the linear movement of the catch the distance between the pivot point on the catch lever and the catch axle may be greater than the distance between the pivot point on the bolt lever and the bolt axle It is also necessary to chose the starting angles of the catch and bolt levers with care Clearly though any other suitable technique could be employed to achieve this effect In order to place the lock in a key disable mode the lock may include a key disable lever and actuating means for causing movement of the key disable lever from a position at which it allows unimpeded movement of the bolt lever to a position at which it prevents movement of the bolt lever In another form of the invention the lock may be placed in a key disable mode by means of a mechanism which disengages the bolt axle from a key cylinder or any equivalent device The key cylinder (or equivalent device) is then freely movable without having any effect on the bolt axle or bolt The actuating means may be of any suitable type and preferably includes a cam and electrical means for causing controlled movement of the cam These principles can be applied in a more generalized way by providing a lock which includes a bolt a key actuated mechanism for moving the bolt between a locked position and an unlocked position a blocking device and a controller which in response to at least one remotely transmitted signal causes movement of the blocking device between a first position at which the key actuated mechanism is operable and a second position at which the blocking device prevents operation of the key actuated mechanism The bolt may thus be kept in a locked position le it cannot be unlocked by means of a key or in an unlocked position le it cannot be locked by means of a key, according to requirement The key actuated mechanism may be of any suitable kind and for example may include a cylinder lock a lever lock or any other appropriate type of lock which is known in the art The bolt may be slidable between the said locked and unlocked positions The blocking device may take on any appropriate form and for example may be in the nature of a member which is movable to prevent engagement of the key with the key actuated mechanism Thus for example the blocking device may include a plate or other member which blocks a keyhole or key aperture thereby to prevent engagement of a key with the key actuated mechanism or where appropriate disengagement of the key from the key actuated mechanism It is also possible to allow a key to be engaged with the Key actuated mechanism but to prevent the key from operating the key actuated mechanism The said remotely transmitteα signal may be a radio signal a signal transmitted by means of a push button an infrared signal or the like The invention is not limited in this regard The controller may be of any appropriate type and for example may be of the general kind described in the specification of international application No PCT/ZA99/001 16 Thus for example the controller may act on a cam which causes movement of the blocking device Drive to the cam may be imparted by means of an electrical motor which may in turn operate through the medium of a worm gear or similar reduction arrangement Any other electro-mechanical mechanism such as a solenoid or other mechanism such as a pneumatic cylinder may be used to achieve this movement of the blocking device BRIEF DESCRIPTION OF THE DRAWINGS The invention is further described by way of examples with reference to the accompanying drawings in which Figure 1 is a side view of a lever mechanism used in a lock according to a first form of the invention Figure 2 is cross-sectional view at right angles to the view of Figure 1 of the lever mechanism Figure 3 is a side view of a hold lever used in the lever mechanism Figure 4 is a cross-sectional view of the hold lever at right angles to the view of Figure 3 Figures 5 and 6 are views similar to Figures 3 and 4 respectively of an unlock lever Figure 7 is a somewhat schematic side view of a lock according to a first form of the invention with a catch and a bolt in respective operative positions, Figure 8 has two views at 90° to each other respectively, of a catch mechanism which is useα in the lock of Figure 7 Figure 9 shows the lock of Figure 7 in a position at which movement of the catch causes movement of the bolt, Figure 10 shows the lock of Figure 7 with the catch and the bolt retracted Figure 1 1 shows the lock of Figure 7 with the catch extending and the bolt retracted, Figure 12 illustrates the lock of Figure 7 prior to the bolt extending, Figure 13 shows the lock of Figure 7 with the catch extended and with the bolt extending, Figure 14 is a flow-sheet illustrating different states of operation of the lock of Figure 7 with the lock in different modes Figure 15 illustrates principal portions of a lock according to a second form of the invention with the lock in a locked mode, Figure 16 is a simplified version of Figure 15 again with the lock in a locked mode Figures 17 18 and 19 illustrate successive stages of the lock of Figure 1 5 being electronically actuated and with a handle being manually moved so that the lock is placed in an unlocked mode Figure 20 shows the lock of Figure 15 with the handle released and with the lock unlocked Figure 21 illustrates electronic locking of the lock of Figure 15, Figure 22 illustrates the lock of Figure 15 being manually locked le by means of a key, Figures 23 and 24 illustrate the lock of Figure 15 in a locked position but being placed into a key disabled mode, Figure 25 shows the lock of Figure 15 in an unlocked position and being placed into a key disabled mode Figure 26 illustrates graphically the relationship between bolt and handle movement in the lock of Figure 15 Figures 27 and 28 depict a lock according to a further embodiment of the invention in key enabled and key disabled modes respectively, Figures 29 30 and 31 illustrate a lock according to another form of the invention in different modes and Figures 32 33 and 34 illustrate a lock according to yet another form of the invention in different modes DESCRIPTION OF PREFERRED EMBODIMENTS Figure 7 illustrates from the side and somewhat schematically a lock 10 according to the invention which includes a catch 12 and a bolt 14 and which is mounted to a door 15 The catch is movable by means of a handle 16 which acts on an axle 18 The manner in which rotational movement of the axle 18 is translated into linear movement of the catch is known in the art and consequently is not further described herein Similarly the bolt 14 is linearly movable to and fro by rotational movement of a bolt axle 20 Again the way in which this movement is achieved is known in the art and consequently is not further described herein Normally the bolt axle is rotatable from an outer side of the door, by means of a key which acts on a separate lock cylinder not shown while from an inner side of the door the bolt axle is rotatable by means of short twist lever, not shown These aspects are however known in the art A mounting plate 22 is positioned between the axles 18 and 20 A cam 24 is mounted for rotational movement to the plate As is shown in block diagram form in the inset drawing to Figure 7 the cam 24 is movable by means of drive from a gearbox 26 which in turn is rotatable by means of an electric motor 28 The motor operates under the control of a control unit 30 which in turn is operated by means of signals output by a receiver 32 The receiver 32 has an antenna 34 which receives radio control signals from a remote control device which is normally hand held and which is not shown in the drawing This kind of operation is common and is encountered for example in the remote opening of garage doors, gates and the like An onboard battery 36 is used to power the receiver, the controller and the motor A catch lever 40 is connected to the axle 18 A first link arrangement 42 depends from the catch lever The first link arrangement includes a flexible elongate link 44 with an in-line release spring 46 The link 44, at a lower end, has a hook formation 48 A component 50 is fixed to a bolt lever mechanism 52 which, in turn, is attached to the bolt axle 20 The bolt lever mechanism is shown in Figures 1 to 6 and is further described hereinafter The upper end of the component 50 has a hook formation 54 which is complementary to the hook formation 48 on the link 44 The plate 22 has a number of spaced guide pins 56 and the link 44 and the component 50 pass between respective pairs of the guide pins A catch mechanism 58 extends upwardly from the bolt lever mechanism 52 It also passes between a pair of guide pins At its upper end the catch mechanism has a hook formation 60 The catch mechanism 58 is shown in two views which are at right angles to one another in Figure 8 The catch mechanism is formed from a slender flexible plate 62 which has a centrally located narrow slot 64 It is to be noted that the hook formation 54 which is at the upper end of the component 50 has a cam surface 66 which extends to the right of the component 50 and which is shaped to enter the slot 64 The cam surface is able to move with a limited degree of lost motion relatively to and inside the slot 64 The bolt lever mechanism 52 includes a hold lever 70 and an unlock lever 72 which are shown in further detail in Figures 1 to 6 A locking spring 74 acts on a formation 76 on the hold lever while an opposing side of the locking spring is attached to fixed structure not shown The hold lever and the unlocked lever are mounted on the axle 20 As is evident from Figure 3 the hold lever has a central round hole 78 which retains the lever on the axle but which permits relative rotation of the lever relatively to the axle On the other hand the unlock lever 72 has a hole 80 which engages firmly with an outer surface of the bolt axle (see Figure 5) and which ensures that the unlock lever and the axle are moved in unison The hold lever 70 has an outwardly extending pin 82 on an outer surface The unlock lever has a pin 84 at its extremity and a pin 86 at an intermediate location The pin 86 abuts a side surface of the hold lever The component 50 is attached to the pin 84 The catch mechanism 58 which is shown in detail in Figure 8 is attached to the pin 82 The lock of the invention is designed to be used in a manual sense similar to the operation of a conventional lock and electrically Consequently there are essentially four modes of operation namely electronic unlocking, electronic locking, manual unlocking, and manual locking Each mode of use is described hereinafter ELECTRONIC UNLOCKING For normal electronic operation the unlocking process is started by a user signalling when he wants the door unlocked It is assumed that the lock is in the position shown in Figure 7 in wnich the catch and the bolt are respectively at locking positions The cam 24 is in a position designated P1 at which the cam deflects the link 44 to the left so that the hook formation 48 does not engage with the hook formation 54 Clearly, in the Figure 7 position the handle 16 can be rotated to cause retraction of the catch The link 44 then moves up as the catch is retracted but as the hook formation 54 does not engage with the hook formation 48 there is no corresponding movement of the bolt 14 Assume that a user transmits a signal which is received by the receiver 32 This signal is decoαed and if correctly identified is used via the controller 30 to operate the motor 28 The motor, through the gearbox 26 drives the cam 24 from the P1 position of Figure 7 to the position shown in Figure 9 which is referred to herein as the P2 position The cam in the P2 position does not deflect the link 44 which therefore moves under its own resilience inwardly to a position at which the hook formations 48 and 54 are interengaged Figure 10 illustrates the next sequence of operation The handle 16 is rotated in a conventional sense and the linkage arrangement 42 is thereby raised rotating with the axle 18 The link 44 is lifted being guided through the pins 56, and the link component 50 is also lifted The unlock lever is thereby rotated in a clockwise sense and as the unlock lever is fixed to the bolt axle 20 the bolt axle is also rotated The pin 86 on the unlock lever causes corresponding rotation of the hold lever 70 The spring 74 is thereby extended As the hold lever 70 is rotated in a clockwise sense the catch mechanism 58 is lifted and is guided for movement through its corresponding guide pins The retaining hook formation 60 at an upper end of the catch mechanism is shaped so that when it impacts a hold catch 90 on the plate it is first deflected to the right and then under the resilience of the catch mechanism moves to the left to engage with an upper surface of the catch 90 During this movement, to the extent necessary, the cam surface 66 of the component 50 moves inside the slot 64 With the loc\ in the Figure 10 position when the handle 16 is released the catch 12 moves from a retracted to an extended position without causing corresponding movement of the bolt 14 When the catch lever is moved from the position shown in Figure 9 to the position shown in Figure 10 and the bolt should for whatever reason become jammed then the release spring 42 is able to extend to relieve undue pressure on the other parts thereby reducing the likelihood that these parts will become damaged As is shown in Figure 1 1 after the handle 16 is released the handle returns to a neutral position with the catch extended A sensor 1 10 is used to sense the position of the catch lever and once the catch 12 has been extended the sensor signals the control unit 30 which then causes movement of the cam from the P2 position to the P1 position Thus with the lock in the Figure 1 1 position the catch can be moved to and fro to latch or unlatch the door and the bolt remains in the retracted or unlocked position ELECTRONIC LOCKING To lock the door the user signals that he wants this operation to take place The signal is transmitted from a remote control unit and is received by the receiver 32 If the signal is correctly decoded and identified then via the controller and the motor the cam is moved from the P1 position to a position designated P3 which is shown in Figure 12 In this position the cam displaces the catch mechanism 58 to the right so that the hook formation 60 disengages from the retaining catch 90 on the plate 22 The spring 74, which is in an extended position constantly exerts a force on the hold lever 70 which tends to rotate the hold lever 70 in an anticlockwise sense about the axle 20 As the hook formation 60 disengages from the retaining catch 90 the spring 74 causes the hold lever to rotate about the axle and the catch mecnanism 50 is moved downwardly A side surface of the hold lever 70 abuts the pin 86 and the unlock lever 72 is therefore rotated in unison with the hold lever The unlock lever 72 causes rotation of the bolt axle 20 and the bolt 14 is then thereby moved to an extended or locking position The cam 24 does not remain in the P3 position but continues rotating to the P1 position The lock is thus restored to the configuration shown in Figure 7 MANUAL UNLOCKING If a user makes use of a key to unlock the door then referring to the configuration shown in Figure 7 the user inserts the key into the lock cylinder (not shown) which operates on the bolt axle 20 As the key is turned the bolt axle 20 is turned and the bolt 14 is retracted The unlock lever 72 moves in unison with the bolt axle and due to the engagement of the pin 86 with a side surface of the hold lever the hold lever 70 is rotated as well The spring 74 is tensioned The catch mechanism 58 is placed in a position at which it engages with the retaining catch 90 The bolt is thereby kept in a fully retracted position The lock configuration is shown in Figure 1 1 MANUAL LOCKING Manual locking commences when the lock is in the configuration shown in Figure 1 1 The user uses a key to turn the bolt axle 20 which causes rotation of the unlock lever 72 and the component 50 is moved downwardly The cam surface 66 at the upper end of the component 50 moves down the slot 64 in the catch mechanism 58 and then leaves the slot whereafter the cam surface deflects the catch mechanism to the right as is shown in Figure 13 The hook formation 60 is thereby disengaged from the retaining catch 90 The extended spring 74 can then cause rotation of the hold lever 72 which causes corresponding further rotation of the axle 20 The bolt is thereby fully extended and the lock takes up the configuration shown in Figure 7 The cam remains in the P1 position Figure 14 is a flow-chart of the aforementioned sequence of operations In block 120 the lock is the Figure 7 configuration An unlock command is transmitted by the remote control unit and is sensed by the control unit 30 in a step 122 If the signal is correctly identified the cam 24 is moved from the P1 position to the P2 position (step 124) If the bolt has been retracted the cam is moved to the P1 position (step 126) and the door is then unlocked If a command has been electronically generated to cause locking (step 130) then the cam is moved to the P3 position and back to the P1 position and the door is locked When the door is unlocked and a key is used for manual locking, le step 132, then the bolt is moved to the locked position (block 120) If the door is locked, then block 134 indicates its manual unlocking If the bolt has not been retracted (block 136) and a lock command is received (step 138) then the bolt remains in the extended position and the cam is turned to position P1 (step 140) The lock of Figures 1 to 13 is thus capable of being operated manually or electronically In either mode of operation when the bolt is moved from an extended or locked position to a retracted or unlocked position energy is stored and the bolt is latched in the retracted position Movement of the handle which operates the catch does not affect the position of the bolt If the bolt is manually or electronically unlocked then the catch mechanism which retains the bolt in the retracted position is released and the energy in the stored spring is utilised to restore the bolt to the locked position The lock of Figures 15 to 26 is designed to address the problem referred to in the preamble hereof which is that, if the lock is not properly installed it may be possible to open a door by releasing tne catch and bolt but that the bolt is not moved sufficiently for it to become latched in a fully open position The bolt then moves to an extended position at which it prevents the door from being closed The lock shown in Figure 15 includes a catch 210 and a bolt 212 which are mounted to a door 214 The catch is movable by means of a handle 216 which acts on a catch axle 218 against the action of a spring, not shown The catch is movaole linearly to-and-fro relatively to the door The manner in which rotational movement of the axle 218 is translated into linear movement of the catch is known in the art and consequently is not further described herein It is also to be understood that the arrangement of gearbox motor controller and receiver shown in Figure 7 can be used for actuating the cam of the lock of Figures 15 to 26 and that the flow chart of Figure 14 applies to the lock of Figures 15 to 26 The bolt 212 is also mounted for linear movement relatively to the door This is achieved by means of rotational movement of a bolt axle 220 Again the way in which this movement is achieved is known in the art and consequently is not further described herein Normally the bolt axle is rotatable, at least from an outer side of the door by means of a key which is engaged with a separate lock cylinder not shown while from an inner side of the door the bolt axle is rotatable by means of a short twist lever not shown These aspects are however known in the art An actuating mechanism 222 is mounted to the axle 220 and to surrounding structure The actuating mechanism is shown in enlarged detail in Figure 15 and various components thereof are shown according to requirement in insert drawings in at least some of the remaining Figures 16 to 25 The actuating mechanism includes a bolt lever 224 which is mounted to the bolt axle 220 The bolt lever has three outwardly extending pins 226, 228 and 230 on one face, and a recessed formation 232 on an edge of the lever A locking spring 234 acts on the bolt lever and biases the lever in an anticlockwise direction about the axle 220 A bolt lever hook 236 extends from a spring 238 which is mounted to the pin 226 The hook 236 has a curved outer face 240 and a flat face 242 A catch 244 is mounted to fixed structure not shown of the lock A catch lever 252 is fixed to the catch axle 218 An elongate link 254 extends from a pivot point 256 on the catch lever to the bolt lever 224 At its lower end in the drawing the link 254 has a hook 258 and a spring lever 260 extends across an open side of the hook The link 254 is urged downwardly by means of a spring 261 which is connected to the hook 258 by an extension piece 262 A key disable lever 264 is mounted to a pivot point 266 which is attached to fixed structure of the lock (not shown) At an upper end in the drawing, the lever has a pin 268 A spring 270 is fixed to a lower end of the lever and extends downwardly abutting a cam 272 which is mounted to an axle 274 The cam is movable by means of an electronic system 276 which is powered by a battery 278 As has been indicateα hereinbefore the electronic system is essentially of the kind shown in Figure 7 in that it includes a gearbox 280 which is rotatable by means of an electric motor 282 which operates under the control of a control unit 284 The control unit in turn is operated by means of signals output by a receiver 286 which has an antenna 288 which receives radio signals from a remote control device which is normally handheld and which is not shown in the drawing The kind of operation is common and is encountered for example in the remote opening of garage doors gates and the like UNLOCKING THE LOCK ELECTRONICALLY In Figure 16 the lock is shown in the locked position The cam 272 is shown in a position designated R1 which is such that it does not abut the hook 258 The hook 258 is not engaged with the pin 230 The catch 210 and bolt 212 are fully extended If the handle is operated the spring lever 260 will slide over the pin 230 Thus only the catch will be extracted if the handle is turned To place the lock in an unlocking mode the cam is caused to turn from the R1 position in Figure 16 to a position designated R2 and shown in Figure 17 A suitable signal is sent from a transmitter to the receiver 286 and under the action of the controller 284 the motor drives the gearbox 280 to cause movement of the cam about the axle 274 A surface of the cam is thereby brought into contact with the extension piece 262 which projects from the hook 258 The spring lever 260 is forced against the pin 230 and the hook 258 is able to engage with the pin 230 Figure 18 shows the handle 216 rotated througn approximately 27° in a clockwise direction The catch lever 252 moves upwardly and the link 254 is also moved upwardly thereby causing the bolt lever 224 to rotate about the axle 220 with the hook 254 engaged Figure 19 shows the handle 216 rotated through 45° which is the maximum extent of rotation of the handle The bolt lever 224 is also rotated to a maximum extent and, it is to be noted the locking spring 234 is extended in the process The hook 236 initially bears against the catch 244 with the curved outer surface riding over a corner of the catch, as shown in Figure 18 The spring 238 allows lateral movement of the hook 236 relatively to the catch 244 to the extent which may be necessary On the other hand when the flat face 242 reaches the catch 244 the spring 238 urges the hook 236 into engagement with the catch The bolt lever 224 is thus retained in the Figure 19 position As the handle 216 moves from the Figure 17 to the Figure 19 position the lever 252 is moved to a substantially vertical position Initially the elongate link 254 is inclined substantially to the vertically while in the Figure 19 position, the link 254 is substantially vertical It is also to be noted that the distance between the pivot point 256 and the catch axle 218 is materially greater than the distance between the axle 220 and the pin 230 on the bolt lever (see Figure 15) It has already been pointed out that rotational movement of the catch axle is translated into linear movement of the catch and that rotational movement of the bolt axle is translated into linear movement of the bolt Consequently, when the handle is rotated in the manner which has been described and due to the geometry of the components used to transfer rotational movement of the catch axle into rotational movement of the bolt axle, a small turning angle of the handle 216 results in a much larger turning angle of the bolt axle initially on the start of the handle turn stroke although to a lesser extent towards the end of the handle turn stroke The bolt is therefore retracted to a greater extent than the degree to which the catch is retracted In other words relatively early during the process of turning the handle the bolt is fully retracted and ideally, is fully retracted before the catch is fully withdrawn Preferably the catch is only fully withdrawn at the end of the handle rotation The bolt is preferably retracted faster at least initially, than the catch It is apparent that in the example, the relative movements of the bolt and catch are dependent on the geometry of the operative components In this respect the length of the bolt lever relatively to the length of the catch lever is important as is the angle of the bolt lever relatively to the angle of the catch lever at the start of the bolt retraction movement These angles may be referred to as the "starting angles" By varying these parameters it is possible to achieve the desired movement of the bolt relatively to the catch The aforementioned mode of operation eliminates the problem, referred to hereinbefore which may occur with a lock of type shown in Figures 1 to 13 which is that a door can be opened by moving the handle, but in such a way that when the handle is released the bolt returns to a fully extending position Figure 26 shows a desired relationship between the bolt rotation angle (on the Y-axis) to the handle rotation angle (on the X-axis) It can be seen that a handle rotation angle of about 30° results in a bolt rotation angle of about 60° On the other hand, towards the end of the handle rotation, the degree of angular movement of the bolt is less than what occurs at the beginning of the handle movement Figure 20 illustrates the components of the lock when the handle is released and the bolt is held in a fully retracted position LOCKING THE LOCK ELECTRONICALLY In order to lock the lock electronically the cam is caused to rotate from the R1 position through 360° in a clockwise direction back to the R1 position During this movement, as is shown in Figure 21 the cam bears against the curved outer face 240 of the hook 236 thereby deflecting the hook to the right, with this movement being allowed for by flexure of the spring 238 Once the hook 236 is disengaged from the catch 244 the bolt lever 224 is free to rotate in an anticlockwise direction under the action of the locking spring 234 The bolt is then linearly moved to its extended position which is shown in Figure 15 UNLOCKING WITH A KEY If a key is used to unlock the lock then, initially, the lock is in the configuration shown in Figure 16 The key acts on a mechanical key cylinder of a kind which is known in the art and which is therefore not further described herein The cylinder in turn acts on the bolt axle 220 As the user turns the key the bolt lever is turned, the locking spring 234 is extended and the bolt is retracted The hook 236 rides over the catch 244 and in a manner similar to that which has been described the flat face 242 is ultimately brought into locking engagement with the catch with the lock components in the Figure 20 position The lock has thus been unlocked manually LOCKING WITH A KEY When the lock is locked using a key the system starts out as in Figure 20 The key acts on the lock cylinder and causes rotation of the bolt axle and the bolt lever As the bolt lever is turned in a clockwise direction the pin 228 moves in under the curved face 240 of the hook 236 (see Figure 22) lifting the hook 236 and sliding the face 242 over the catch 244 The spring 238 is extended for the face 242 remains engaged at least initially with the catch 244 The hook is displaced out of engagement with the catch and the spring 238 then retracts drawing the hooκ away from the catch The locking spring 234 can then cause further rotation of the bolt lever in an anti-clockwise direction so that the bolt 212 is fully extended thereby completing the locking action KEY DISABLE MODE It is desirable to be able to place the lock into a key disable mode in which a key is prevented from being used to unlock the lock The lock can however still be locked using a key Figure 23 shows the lock in a locked position but with the key disable mode not activated When the lock is to be placed in the key disable mode the electronic actuating system 276 is operated to move the cam 272 to a position designated R3 as shown in Figure 24 The cam bears against the spring 270 causing the lever 264 to rotate about the pivot point 266 so that the pin 268 can engage with the recessed formation 232 in the bolt lever 224 as shown in Figure 24 This prevents the bolt lever from being rotated Consequently a key cannot De used to turn the bolt lever and the bolt 212 remains the extended position The software in the controller 284 prevents the lock from being placed in the key disable mode unless the cam is operated so that it is turned to the R3 position Clearly it is not possible to place the lock in a key disable mode when the bolt is fully withdrawn for, at this stage the bolt lever is in the position shown in Figure 19 However once the bolt lever returns to the Figure 24 position the pin 268 will again automatically engage with the recessed formation 232 Figure 25 illustrates the situation which arises when the key disable mode is entered when the door is unlocked The spring 270 bends to take up the distortion caused by the pin 268 pressing against the bolt lever As stated if the bolt lever rotates sufficiently far in an anticlockwise direction the pin 268 is able to enter the recessed formation 232 thereby engaging the disabled key disable mode At this stage though the bolt 212 would be fully extended The lock can be placed in a key disable mode in a variety of different ways, and Figure 23 illustrates schematically a key cylinder 300 of conventional construction which includes a keyhole 302 into which a key not shown can be inserted to cause movement of a projection 304 This type of action is known in the art A lever 306 which is pivotally attached to the bolt axle 20, has a hook 308 which engages with the projection Rotation of the projection in a clockwise sense, by actuating the key cylinder, thus causes rotation of the bolt axle and retraction of the bolt A cam 310 is movable in a manner similar to the cam 272 by means of a drive chain (not shown) which is similar to the gearbox/motor/controller/receiver assembly shown in Figure 15 If the cam is caused to rotate upwardly from the illustrated position, then the lever 306 is raised by the cam and the hook 308 is disengaged from the projection 304 The key cylinder can then be moved freely without causing movement of the bolt axle or the bolt and the lock is therefore in a key disable mode The embodiments of the invention shown in Figures 27 to 34 are concerned generally with providing a remotely controlled facility which is used to inhibit the use of a key to unlock a lock or to lock a lock according to requirement The lock may of a conventional kind eg a mortise lock or a cylinder lock or it may for example be of the type described in the specification of international application No PCT/ZA99/001 16, or the lock may be of any other type In the following description reference is made to three examples which are based on the use of a mortise type lock It is to be understood that this is given merely by way of example and again the invention is not limited in this regard Figure 27 of the accompanying drawings illustrates a mortise type lock 410 which includes a housing 412 in which are mounted a latch 414 and a bolt 416 The latch and the bolt extend through apertures formed in a plate 418 which is attached to the housing The latch is biased by means of one or more springs 420 and is movable in a manner known per se by means of a lever 422 which is mounted to a square shaft 424 which is rotatable by means of a handle 426 shown in dotted outline These aspects are substantially conventional and consequently are not further described herein The bolt 416 has an elongate slot 428 wnicn is engageα witn a guiαe pin 430 A plurality of levers 432 are mounted for pivotal movement to the pin Only one lever is shown in the drawing The levers are Diaseα downwarαly by means of a spring 434 The levers have internal catch formations 436 ana 438 whicn are engageaole with an outwardly projecting catch 440 on a siαe ot the Dolt 416 Tne catch 440 is snown in Figure 27 engageα with the catch formations 436 A keyhole 442 is formeα in the nousing If a correct key is mserteα into the keynole then when the key is rotated tne levers are raiseα ana are αisengagεd from tne catch 440 Further rotation of the Key in the appropriate direction causes the key to engage with a recessed formation 444 in the oolt and the movement of the key then causes sliding movement of the oolt 416 from the illustrated extended position to a retracted position at which the bolt is wholly inside the nousing When the key is further rotated the spring 434 acts to pull the levers αownwardlv Again it is to be noted that this type of operation is substantially conventional ana conseauentlv is not further aescrioea in detail herein Mounted inside the nousing 412 is a miniature motor 446 and a gearbox eg a worm drive 448 which is driven oy the motor The gearbox in turn acts on a cam 450 The components 446 ana 448 are mounteα inside a casing 452 and the cam 450 is on an outer side of the casing A relatively thin lever 454 is mounted to a pivot point 456 on an inner surface of the housing 412 An upper enα of the lever is adjacent a surτace of the cam 450 A lower end of the lever bears against a Din 458 wrtich projects from a Clocking memoer 460 wnich is mounteα for sliαing movement insiαe guiαe formations or rollers 462 A spring 464 acts on the blocking memDer to move it to the left in the αrawing The lock includes a controller 66 and a battery 468 These components are shown as being external to the nousing 412 This is by no means essential thougn for the controller and the battery could be positioneα inside the housing The controller 466 is responsive to a remotely generateα signal or signals The nature of the remote signal is not restrictive for the controller may be responsive to an optical signal a radio signal an infrared signal a signal wπich is transmitted over a conαuctor or the like The controller may include logic of the type known in the art which can establish whether a signal is a valid signal in order to cause operation of tne controller For example use may be made of coded signals and the controller may include logic for rejecting incorrectly coded signals and for accepting only correctly coded signals These aspects are similar to which is described in the specification of international application No PCT/ZA99/001 16 With the lock 410 in the configuration shown in Figure 27 a key can oe inserted into the key hole 442 and the bolt can be actuated in a conventional manner by means of the key If a predetermined signal is received by the controller 466 then the controller interprets this signal as an instruction to inhibit operation of the lock by means of a key When the signal is received the motor 446 is energised by means of the battery 468 and the gearbox 448 is driven thereby to rotate the cam through 180° from the position shown in Figure 27 to the position shown in Figure 28 Rotation of the cam causes the lever 454 to pivot in an anti-clocKwise direction about the pivot point 456 Conseαuently the lower end of the lever move to tne right ana as the lever bears on the oin 458 the blocking member 416 is oveα to the rignt against tne biasing action of the spring 464 This movement is guided by means oτ tne guiαe 462 The πgnt-hanα enα of the Diocking memoer carries an eπlargeα plate 470 wnicn obscures the KΘV noie 442 when the DlocKing memoer is moveα fully to the right Consequently it is not oossipie for a kev to oe inserted into the keyhole to operate the bolt The invention thus oroviαes a remote control facility to mnibit key operation of the lock in the arrangement snown in Figures 2 7 ana 28 the blocKing member is usea to prevent a key from being empioyeα to unlock the bolt In an alternative mode of operation the blocking member can be used to block the keyhole 442 when the bolt is in an unlocked position In this way the key cannot be used for causing movement of the bolt 416 from an unlocked position to a locked position If the controller receives a further or seconα preαetermined signal then the cam 450 is causeα to rotate from tne Figure 28 to the Figure 27 position The force wnich is exerted by the lever 254 on the blocking member is released and the spring 264 restores the blocking member to the left-hand position shown in Figure 27 Since locks of this nature usually have two keyholes (one on an inner siαe ana the other on an outer siαe of the door) the blocking memoer 460 may be formed to cover both keyholes or only one (inside or outsiαe) depenαing on the situation and usage of the lock Figures 29 30 ana 31 show a lock 10A whicn is similar in many respects to wnat has been descriDeα in connection with Figures 27 and 28 ana wnere applicable components of the lock 410A which are the same as corresponding components of the lock 410 bear like reference numerals In the arrangement shown in Figure 27 the blocking member 460 is used to prevent a key from being inserted into the keyhole 442 By way of contrast in the arrangement shown in Figure 29 a blocking member 460A is movable, in a manner which is analogous to what has been described in connection with Figure 27, by means of a motor driven cam 450 which acts through a lever 454 not to block the keyhole 442 but to prevent movement of the levers 432 and to prevent rotation of the key 480 in one or more rotational direction Figure 29 illustrates the lock 410A in a position at which a key 480 can be inserted into the keyhole 442 and can be freely rotated to cause movement of the levers 432 If the blocking member is moved to the right, as is shown in Figure 30 a formation 470A at the right-hand end of the blocking member is moved to a position at which rotation of the key 480 is inhibited The formation 470A is moved to a position at which free rotation of the key is restrained and the key is thereby prevented from coming into contact with the levers 432 This is with rotation of the key in a clockwise direction By way of contrast referring to Figure 31 if the key 480 is rotated in a counter- clockwise direction then the key is aole to operate on the levers 432 At a limiting point in its rotational movement however the key abuts the formation 470A and forces the blocking member 460A to the left The lever 454 is placed under stress and can be bent For this reason the lever snould be made from a bendable material it follows tnat reτerrιng to Figure 30 wnen the ooit 416 is in a locκed position and the cam is actuateα to taKe up tne position shown in Figure 30 tne bolt cannot be uniockeα by means oτ.a kev On the otner hanα if the Dolt is in an uniockeα position and the cam is in the Figure 30 position (wnich is the same as in the Figure 31 position) then the key 480 is capable ot moving tne Dolt from an unlocked to a locκeα position Again it is to be noted that in the example snown in Figures 29 30 and 31 the blocking member is used to αisable locking of the bolt by means of a key Accorαiπg to requirement the blocking memper could be useα to prevent key-actuated unlocKiπg of the bolt Figures 32 33 and 34 illustrate a lock 410B which bears many resemblances to the lock shown in Figures 29 30 and 31 Again like components are designated by means of like reference numerals The lock 410B additionally however nas certain of the functions and components descπoed in the specification of international patent application No PCT/ZA99/001 16 Thus tne hanαle-ooerated shaft 42^ acts on a seconα lever 422A which in turn is connecteα to a pivotally mounteα link 490 When the nanαle 426 is αepressed the link 490 is moved into engagement with a hook-shapeα catch 492 and the Dolt 416 is moved to the πgnt ιe to an unlocked position against the action of a spring 494 A seconαary catch keeps the ooit in the retracted position The bolt can be released by means of a correctlv coded remotely generated signal which is received by the controller and which in turn causes operation of the cam 450 The stored energy in the spring 494 then moves the bolt from the unlocked to the locked position This particular sequence of operations is not descriDeα in detail herein for it is simiiarto the sequence described in the specification ot international application No PCT/ZA99/001 16 It can oe seen from a comparison oetween Figures 29 30 ana 31 on the one hand and Figures 32 33 and 34 on tre other nanα that the blocking member 460A in the lock 41 OB functions in the same wav as tne blocκιng member 460A in the lock 41 OA Thus with the clocking memoer 460A in tre Figure 32 position the key 480 can De freely inserted into the keyhole 442 and rotateα accorαmg to requirement to lock or to unlock the bolt This is apart from the facility to control the locking of the bolt electronically using energy stored in the spring 494 as has Deen described in the specification of international patent application No PCT/ZA99/001 16 With the locking member 460A in the Figure 33 position the key 480 cannot be rotated to unlock the bolt On the other hand if the bolt is retracted le in an unlocked position then, as is indicated from an examination of Figure 34, rotation of the key in an anticlockwise direction will cause the levers 432 to be lifted and the bolt will be moved from an unlocked to a lockeα position under the action of the key ana under the action of the spring 494 The key will however contact the formation 470A ana urge the clocking memoer to the left thereoy once again causing movement of the lever 454 In Figures 32 to 34 the blocking member is used to prevent a key from being employed to unlock the Dolt In a different moαe of operation the blocking member can be used to prevent the key from being employed to move the bolt from an unlocked to a locked position This aspect of the invention nas been described with reference to three examples which are baseα on the use oτ a mortise type lock As has oeen pointed out the scope of the invention is not limited in tnis regarα for the principles thereof can oe employed with cylinder type locks or other locks, and in particular with locks of the type shown in Figures 1 to 26.

Claims: CLAIMS 1 A IOCK which incluαes a bolt a eaten a handle for manually moving the catch from an operative position to an inoperative position first link means and electrically actuable means for causing movement of the first link means between first and seconα positions the first link means at the said first position translating movement of the handle in a first αirection into movement of the bolt from a locked position to an unlocked position and at the said second position allowing handle movement in the said first direction without corresponαing movement of the bolt A lock according to claim 1 which includes energy storage means which is operable to release energy which at least assists in moving the bolt from the unlocked position to the locked position A lock according to claim 2 which includes a catch mecnanism for retaining the bolt in the uniockeα position and wnerein the said electrically actuable means is operable to release the catch mechanism to allow the bolt to be moved from the unlocked position to the locked position under the action of the energy storage means A lock according to claim 3 which includes an axle a hold lever wnich is rotatable about the axle an unlock lever which is fixed to and which is rotatable in unison with the axle and at least one formation on at least one of the hold lever and the unlock lever whereov rotation of the hold lever in a first direction causes rotation of the unlock lever in the first direction rotation of the hold lever in a second direction which is opposite to the first direction does not cause corresponding rotation of the unlock lever in the seconα direction rotation of the unlock lever in the second direction causes corresponding rotation of the hold lever in the second direction and rotation of the unlock lever in the first direction does not cause corresponding rotation of the hold lever in the first αirection, a component of the first link means being connected to the hold lever and a component of the catch mechanism being connected to the unlock lever whereby movement of the first link component caused by movement of the hold lever in the second direction causes movement of the catch mechanism component from a retaining position to a non-retaining position A lock according to claim 4 wherein the said electrically actuable means is operable to cause movement of the component of the catch mechanism from the said retaining position to the said non-retaining position A lock accorαing to claim 1 wherein the said movement of the catch from the operative position to the inoperative position is linear movement the said movement of the bolt from the locked position to the unlocked position is linear movement and wherein the said linear movement of the bolt is greater at least initially than the said linear movement of the catch A lock according to claim 6 wherein the said handle is mounted to a catch axle and the first link means includes a catch lever which is mounted for rotation to the catch axle a bolt lever wnich is mounted for rotation to a bolt axle and a link which extends between a pivot point on the catch lever and a pivot point on tne bolt lever and wherein the distance between the pivot point on the catch lever and the catch axle is greater than the distance between the pivot point on the bolt lever and the bolt axle A lock according to claim 1 wherein the said movement of the catch from the operative position to the inoperative position is faster, at least initially than the said movement of the bolt from the locked position to the unlocked position A lock according to claim 1 which includes a key disable mechanism and actuating means for placing the key disable mechanism in a first mode in which unimpeded movement of the bolt lever is allowed, or in a second mode in which movement of the bolt lever is prevented. A lock according to claim 9 wherein the key disable mechanism includes a lever and wherein, in the said first mode, the lever is moved to a first portion at which the lever allows the said unimpeded movement of the bolt lever and wherein, in the said second mode, the lever is moved to a second position at which bolt lever movement is impeded A lock according to claim 1 which is includes a key cylinder and a mechanism, wnicn in a first mode engages the key cylinder with the bolt axle and which, in a key disable mode, disengages the key cylinder from the bolt axle so that the key cylinder is movable without causing movement of the bolt axle, or the bolt A lock which includes a bolt a key actuated mechanism for moving the bolt between a locked position and an unlocked position, a blocking device, and a controller which in response to at least one remotely transmitted signal, causes movement of the blocking device between a first position at which the key actuated mechanism is operable and a second position at which the blocking device prevents operation of the key actuated mechanism A lock according to claim 12 wherein the key actuated mechanism is selected from a cylinder lock and a lever lock A lock according to claim 12 or 13 wherein the bolt is slidable between the said locked and unlocked positions A lock according to claim 12 13 or 14 wherein the blocking device includes a member which blocks a keyhole or key aperture thereby to prevent engagement of a key with the key actuated mechanism or, where appropriate, disengagement of the key from the key actuated mechanism

Inventors: AUCAMP BRANDT, BRUWER FREDERICK JOHANNES, VARI LAJOS MONTE, AUCAMP, BRANDT, BRUWER, FREDERICK, JOHANNES, VARI, LAJOS, MONTE
Applicants: AUCAMP BRANDT, AZOTEQ PTY LTD, BRUWER FREDERICK JOHANNES, VARI LAJOS MONTE, AUCAMP, BRANDT, AZOTEQ (PTY) LTD., BRUWER, FREDERICK, JOHANNES, VARI, LAJOS, MONTE
Application year: 2001
Main classification: E05B47
IPC codes: E05B13, E05B47, E05B59, E05B63