AU9607498A - A lock - Google Patents

Description

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AUSTRALIA

PATENTS ACT 1990 DIVISIONAL APPLICATION 06**

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I *1 I S. S

AS

NAME OF APPLICANT(S): John Russell Watts ADDRESS FOR SERVICE: DAVIES COLLISON CAVE Patent Attorneys, 1 Little Collins Street Melbourne, 3000.

INVENTION TITLE: A Lock The following statement is a full description of this invention,- including the best method of performing it known to me: QN0PRH~433.fV-3I2=9 la A Lock rela articular elates to locks for security doors.

particular elates to locks for security doors.

The invention provides a lock comprising an engageable means, a casing, an engaging means supported within the casing engageable with the engageable Smeans to restrain relative displacement therebetween, an operating means by which to effect disengagement said operating means including an operable lever supported in an external lever assembly, a deadlocking means actuateable to a deadlocking configuration to restrict disengagement including an actuating means including a key operable cylinder comprising an angularly displaceable barrel supported in a cylinder housing comprising a portion of the lever assembly.

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f|i{,i Description of the Drawings Embodiments of the present invention will now be described by way of example only with reference to the accompanying drawings in which: Figure 1 is an isometric view of a lock in a door with a fully extended bolt, where the front edge of the lock bod, and the internal lever assembly are shown, Figure 2 is schematic side view of a deadlocked lock body Figure 3 is a schematic side view of the lock body with the bolt held partly retracted, Figure 4 is a schematic plan view of the lock body, Figure 5 is a partial front edge view of the lock body Figure 6 is a side edge schematic view of a lever assembly having a slide, Figure 7 is a partial sectionai schematic view of the lever assembly of Figure 6 from the back sectioned through the slide, Figure 8 is a partial sectional schematic view of the lever assembly of i Figure 6 from the back sectioned through the driven cam, Figure 9 is a is a side edge schematic view of an external lever assembly, S: Figure 10 is a partial view of the back of the lever plate of Fig. 9 showing the barrel and surrounding cylinder housing, Figure 11 -is the sectional view BB Figure 9, Figure 12 is the sectional view AA Fig 9, Figure 13 is a schematic plan sectional view of a lock body with a S. protruding bolt located within a strike plate, Figure 14 is a schematic plan sectional view of a lock body with a I protruding bolt located within a strike plate where the bolt has been forced against the edge of the strike plate aperture and the lock has been forced away from the door jamb.

Figure 15 is a partial sectional schematic side view of a lock body with a pivotally displaceable bolt, Figure 16 is a is a schematic plan view of the lock body of Figure Figure 17 is a partial schematic side view of a lock body with a solenoid actuated plunger adjacent the deadlocking slide, Figure 18 is a partial schematic side view of a lever back plate having an electric motor and slide coupled to a shaft which connects to the snib cam.

~-~--rT"nrClrUPIU c~ Description of the Preferred Embodiments The accompanying drawings illustrate a number of embodiments of the invention. The same reference numerals are used for like components in all embodiments as shown. The positional prepositions such as rear forward are used to assist in description of the preferred embodiments and have in general no absolute other significance.

One embodiment of the invention as shown in Figure 1 comprises in summary a lock including a casing 10, a latch bolt 20 supported within the casing and displaceable under spring bias 30 to extend from the casing where it can engage in a recess 2 within a strike plate 1 as shown in Figure 13 which in some cases has a fin engageable by the latch bolt to latch during which process the latch bolt is driven inwardly as the leading edge slides up the ramped portion of the fin. The latch bolt is retractable by operation of a lever 61 in a lever assembly 60 connected to the casing by a shaft 55 as shown in Figues 1 and 9. In a preferred embodiment there is within the casing a deadlocking slide 80, Figure 2, i which can be moved into engagement with a shoulder on the latch bolt to restrict inward displacement of the latch bolt. This is achieved by actuation of a key operable barrel 90, Figure 1, or actuation of other actuating means. In a preferred embodiment the latch bolt is held partly retracted to assist in latching engagement S° with the strike plate. The latch bolt is retained by a detent which includes the auxiliary bolt 70; inward displacement of which allows the latch bolt to fully extend.

The locks provided by the invention are different from those described in the prior art both in construction and in function. In particular the invention provides a lock which will function when inverted by having levers that function in both directions and it provides a lock which is less expensive to manufacture by combining the cylinder with the lever assembly. It also provides a lever that can be quickly dismantled for packaging reasons.

4 As shown in Figure 2 the lock casing 10 is box like having a wall 16 on the front edge, a wall 19 on the back edge and sides 18 and tabs top and bottom by which the casing is attachable to a door. Within the front edge there is an aperature 11 through which in a preferred embodiment a latch bolt has passage to be displaceable to an extended position where it protrudes from the casing.

In a preferred embodiment employing an auxiliary bolt there is also an aperature 14 through which an auxiliary bolt has passage to be displaceable to an extended position where it protrudes from the casing.

1 Within the sides of the casing there are aperatures which support internal S. parts. The casing is in fact comprised of a front portion and a rear portion abutting through the aperatures; the front portion comprising the front edge 16, the fixing tabs, side walls and top and bottom walls preferably all as a single casting to S provide greater strength. The front portion may have rearwardly blades 13 which pass through mating aperatures in the rear portion and are peened over to secure S the two portions together. Within the front portion there is internal webbing 12 to .j strengthen the casing while the aperature 11 has radiussed comers, Figure 5 to resist cracking when side loading is applied to an extended latch bolt. This S construction is stronger than that in common use.

In a preferred embodiment the latch bolt 20 is of a solid box like Sconstruction with radiussed top and bottom edges to mate the radii in aperature 11 and is supported betwen webbs 12 to be freely slideable. The latch bolt has a leading portion 22 which is displaceable between a fully retracted position where it is within the casing and a fully extended position where it protrudes from the casing. The latch bolt is outwardly biassed and moveable by spring 30 and inwardly moveable by an operating arm 40 which is operably connected to the lever. The latch bolt rearwardly has a recessed portion 24 within which the operating arm locates in front of a pinned protrusion 23 of the latch bolt.

Rearward movement of the operating arm causes the arm to engage the pinned protrusion 23 and move it rearwardly to retract the latch bolt.

In a preferred embodiment, Figures 3 and 4, where the latch bolt is held partly extended prior to latching the latch bolt leading portion has sides which are similarly curved on both sides as shown in Figure 4 to facilitate inward displacement by the strike plate when engaging the leading portion on either side.

This is to accommodate both left and right hand opening doors. In this case and in another case where the latch bolt is held fully retracted prior to latching the operating arm passes across the latch bolt so that a shoulder 41 on its end is engageable by a shoulder 71 of the auxiliary bolt 70 which on depression of the auxiliary bolt moves out of the path of movement of shoulder 41.

SIn another preferred embodiment, Figure 15, the latch bolt 29 is angularly displaceable and supported on a pin within the casing which passes from one side to the other. It is similarly spring biased to displace towards an engageable position and moveable away from this position by the operating arm acting as described above. The pivotal latch bolt may operate within the confines of the casing as may be the case for when the lock is configured for sliding doors in t which case the plate takes the form of a plate with a raised portion which fits S within the aperature 11 having an engageable aperature. In the case of a hinged V door lock the pivotal latch bolt has a leading portion 22 which is displaceable between a fully retracted position where it is within the casing and a fully extended position where it protrudes from the casing and the leading portion preferably has a hooked end which engages in and behind the plate aperature.

The latch bolt leading portion has sides which are similarly curved on both sides as shown in Figure 16 to facilitate inward displacement by the strike plate when engaging the leading portion on either side. This is to accommodate both left and right hand opening doors. The latch bolt is held partly extended or fully retracted prior to latching to facilitate latching; the operating arm passes across the latch bolt so that a shoulder 41 on its end is engageable by a shoulder 71 of the I-i*i i~~-nXaC;i;r- L L auxiliary bolt 70 which on depression of the auxiliary bolt moves out of the path of movement of shoulder 41 as is the case for the slideably supported latch bolt.

The auxiliary bolt, Figure 3, comprises a leading portion 75 which is displaceable to extend from the casing under the action of biasing spring 73 and a rear portion comprising an angled face 72 adjacent the shoulder 71 and on the latch bolt side. The casing has a ramped rib portion 17 which when the auxiliary bolt is fully extended is adjacent the angled face 72 whereby inward displacement of the auxiliary bolt by strike plate fin engagement during latching causes face 72 to slide down ramp 17 to displace the shoulder away from the latch bolt operating S arm shoulder 41 and out of the path of movement of the shoulder. The rear S portion of the auxiliary bolt is free to move, within limits, vertically against a force S derived from the biassing spring 73.

SThe auxiliary bolt leading portion preferably has sides which are similarly curved on both sides as shown in Figure 4 to facilitate inward displacement by the strike plate when engaging the leading portion on either side. The latch bolt, Figure 3, is driven inwards against spring bias 30 by the operating arm 40 which is supported on a cylindrical portion of operating cam 50 which is supported in a S round aperature in the side walls of the casing. The operating arm has an S engageable shoulder 42 radially displaced from its axis of rotation displacement of which causes it to rotate to engage the protruding pin 23 of the latch bolt to drive the latch bolt inwardly. The operating cam is coupled to the lever 60 in an external lever assembly 60 by a substantially rectangular shaft 55 so that lever rotation causes the cam to rotate. The shaft 55 engages in a mating coaxial recess in the operating cam.

There is an operating slide interspaced between the lever and operating arm so that lever rotation in either direction can cause the latch bolt to retract.

The operating slide may be within the lever assembly, Figures 5 to 8, but is preferably within the casing. In the latter case Figure 2,3 the operating cam has l L two shoulders 53 one on each side of its axis of rotation and the operating slide has a corresponding shoulder 91 on each side of the axis of rotation of the operating cam adjacent an operating cam shoulder and engageable by it.

The operating slide is supported between webbs 12, 13 in the casing and is free to slide. It is biassed by springs 92 which locate within elongated recesses within the operating slide towards the operating cam. In the undisplaced position the shoulders 91 are held pressed against the shoulders 53 to cause the operating cam to adopt an undisplaced position. Preferably the shoulders 53 are winged extensions of the operating cam and the shoulders 91 mate with these in an undisplaced position. On the operating slide is a pinned protrusion 93 which is S engageable with the operating arm shoulder 42 to cause the latch bolt to retract S when the operating slide is driven forward. Although shown sliding parallel to the latch bolt the operating slide can move in any direction within the plane of the latch bolt; the important relationship is that the pinned protrusion 93 and shoulder 42 must be radially displaced from the axis of rotation of the operating arm and the pinned protrusion must move in a direction having a tangential component.

In another embodiment Figures 6,7,8, the operating slide is within i* the lever assembly 60 and the operating cam 50 is coupled to the lever by splined l engagement. In this embodiment the operating arm 40 is attached to a cylindrical boss which has an aperture to receive the shaft 55 said boss being supported within apertures in the wall of the lock body. The operating slide 90 on one layer, Figure 7, has the shoulders 91 and the cam 50 has wings 53 and rotation of the lever and cam in either direction causes on of the wings 53 to drive the slide against spring biassing means in the same direction. On another layer, Figure 8, the slide has has a protrusion 93 which engages in a recess in a disclike cam 100 to drive the cam, this cam having integrally attached a shaft portion 55 which in application connects to the operating arm within the lock body. The disclike cam has a peripheral recess 56 having clearance below the protrusion 93 and a radial shoulder 101 adjacent the top so that operating slide movement in response to ffo 8 lever rotation in either direction causes the operating slide to displace upwards to rotate the cam 100 in the same direction, a direction corresponding with-actuation of the operating arm 40 to retract the bolt.

The latch bolt is securable in the fully extended position and in a particular embodiment is securable at multiple extended positions. The deadlocking means generally comprises a deadlocking slide supported adjacent the latch bolt within the casing and having a leading portion 81 which can be actuated by various actuating means to displace towards the latch bolt to engage it. In the simpler lock the leading portion 81 engages behind the shoulder 28 ,Figure 2, of the latch bolt to prevent the latch bolt from being moved inwardly.

The actuating means may include a key operable cylinder_a snib locking means including a lever and an electric snib locking means which is connected to S a controller which in simplest form would be an electrical switch.

5. The key operable cylider has an angularly displaceable cylinder cam 110, S Fig 3, with an armed extension 111 which locates within a concave recess 82 in the deadlocking slide which is bounded by a lower shoulder 83 and an upper S shoulder 84. The deadlocking slide can be moved in either direction by cylinder S cam rotation by the armed extension 111 engaging one of the shoulders 83 or 84 S and the cylinder cam can be rotationally displaced, within limits, by deadlocking slide movement. While the armed extension remains within the bounds of the shoulders 83 and 84 it remains coupled to the deadlocking slide, for convenience called a first range of coupled movement but when the deadlocking slide is substantially fully travelled towards the latch bolt and is in the deadlocking position, for conveience called a first locking configuration, the cylinder cam can be partially further rotated to effect a surface of contact between the extension 111 and shoulder 84 which is substantially orthogonal to the cylinder cam centre of rotation thereby preventing the deadlocking slide from driving the cylinder cam, for convenience called a second locking configuration, at which position the the -3 deadlocking slide cannot be actuated by the other actuating means. As is common the cylinder comprises a double cylinder having two barrels one on each side and the cylinder cam connected to and operable by each barrel.

In a preferred embodiment the key operable cylinder comprises the angularly displaceable cylinder cam 110 supported in aperatures within the side walls of the casing and a key operable angularly displaceable barrel 90 supported in a cylinder housing 152 comprising a portion of the lever assembly 60, Figure 9.

The barrel preferably has a peripheral end side protrusion 151 in line with the wafers 153 and similar in form to an extended wafer. The housing has the normal longitudinal elongated slotted 155 recesses to facilitate wafer movement as is S well known; however in this case the one recess has an end wall 156 while the other has an aperature 157 to permit passage of the end side protrusion so that when the barrel is inserted through the aperture and rotated it cannot be S removed. Preferably the cylinder barrel and cylinder cam are coaxially supported and the barrel extension engages in a recess 158 in the cam, Figure 3, to operate the cam. Once assembled the barrel movement is restricted by its engagement with the cylinder cam to positions where the protrusion 151 does not become aligned with the aperature 157 thereby restricting barrel removal. In some cases S the casing is mounted within a frame having thin walls and the lever assembly is mounted on the exterior of the frame and the cylinder barrel extends through the frame. To accommodate variation in the distance between the lever assembly and the casing the engagement between the barrel and cylinder cam recess is splined in form.

The snib locking actuating means comprises a cylindrical cam 121 having a coaxial recess engageableby the shaft ofa snib lever 164, Figure 1, in the lever assembly. The cam 121 has an armed extenstion 122 with a protruding pin which locates within a recess 85 in the deadlocking slide so that the slide is moveable between positions by snib lever rotation subject to the deadlocking slide not being restrained in the second locking configuration.

-lr~ruxr 1C~~r~-rr~ rrrarr m~-~~Ur~unrpp~marrrr~ The actuating means may also comprise an electric snib locking means.

figure 17, comprising a solenoid 130 having a plunger 131 spring biassed 132 towards an adjacent recess 133 in the edge of the deadlocking slide such that the plunger releasably retains the deadlocking slide in an undisplaced position. There is a deadlocking spring 134 urging the deadlockig slide toward engagement and the solenoid in response to electric current retracts the plunger to release the deadlocking slide to allow it to be moved to the deadlocking position. The recess 131 may be angled to facilitate overriding by other actuating means in which case the plunger can be forced out of the recess by deadlocking slide movement.

In another case the actuating means may comprise within the lever assembly, Figure 18, an electic motor 140 having a threadi drive shaf 141 engageable within a thread in a slide 142 supported within the lever assembly for S sliding movement said slide having an elongated cross slot 143 within which a pinned protrusion 144 of a snib cam 145 locates; this snib cam 145 having an axial shafted extensions engageable in the recess in cam J21, Figure 3. The slide S 142 is moveable up and down by motor rotation and as a vbnsequence the cam 145 is angularly displaceable by motor movement to move the deadlocking slide between a deadlocking and undeadlocking position.

The lever 61, Figure 9, is removeably retained within the lever assembly 60. It comprises a hand operable ball or lever 62 integrally connected to a cylindrical shaft 63which is retained free to rotate within a cylindrical aperature 64 in a boss 65 of the lever assembly backplate 66. The shaft has peripheral end protrusions 67 and the boss has elongated slotted aperatures 68 to permit pasage of the protrusions 67. When the lever is assembled onto the back plate and is rotated the lever is retained by the protrusions. Preferably there are two opposite protrusion and the coupled operating cam requires less than 90 degree movement so that once the lever is connected by the shaft 55 to the operating cam its movement is restricted so that the aperatures 68 and protrusions 67 S. i o The actuating means may also comprise an electric snib locking means, figure 17, comprising a solenoid 130 having a plunger 131 spring biassed 132 towards an adjacent recess 133 in the edge of the deadlocking slide such that the plunger releasably retains the deadlocking slide in an undisplaced position. There is a deadlocking spring 134 urging the deadlockig slide toward engagement and the solenoid in response to electric current retracts the plunger to release the i deadlocking slide to allow it to be moved to the deadlocking position. The recess 131 may be angled to facilitate overriding by other actuating means in which case the plunger can be forced out of the recess by deadlocking slide movement.

In another case the actuating means may comprise within the lever S assembly, Figure 18, an electic motor 140 having a threaded drive shaft 141 engageable within a thread in a slide 142 supported within the lever assembly for sliding movement said slide having an elongated cross slot 143 within which a pinned protrusion 144 of a snib cam 145 locates; this snib cam 145 having an axial shafted extensions engageable in the recess in cam 121, Figure 3. The slide 142 is moveable up and down by motor rotation and as a consequence the cam 145 is angularly displaceable by motor movement to move the deadlocking slide between a deadlocking and undeadlocking position.

The lever 61, Figure 9, is removeably retained within the lever assembly i 60. It comprises a hand operable ball or lever 62 integrally connected to a Scylindrical shaft 63which is retained free to rotate within a cylindrical aperature 64 in a boss 65 of the lever assembly backplate 66. The shaft has peripheral end; protrusions 67 and the boss has elongated slotted aperatures 68 to permit pasage of the protrusions 67. When the lever is assembled onto the back plate Sand is rotated the lever is retained by the protrusions. Preferably there are two Sopposite protrusion and the coupled operating cam requires less than 90 degree movement so that once the lever is connected by the shaft 55 to the operating cam its movement is restricted so that the aperatures 68 and protrusions 67 cannot align. It will be appreciated that prior to assembly of the lever assembly to the casing both barrels and levers can be inserted and/or changed as is required.

In a preferred case a snib locking lever Fig 1.9 may comprise a cylindrical portion 161 integrally connected to its associated shaft 163 which extends from the underside of the assembly. Projecting substantially radially from the cylindrical portion and having passage through an end aperature 166 in the back plate are two arms 164 and 165 which are angularly displaced in relation to each other at approximately the same angle as the cam 121 moves between its limits of S rotation and angularly disposed so that when the deadlocking slide is deadlocked Sl one arm 164 is substantially retracted while when the deadlocking slide is at the S other extent of its travel unlocked the other arm 166 is substantially retracted.

This member is substantially supported by the shaft 163. According to the above S* design the snib comprises two push buttons; pushing one locks the lock while I pushing the other unlocks the lock.

In a preferred embodiment the latch bolt, which is engagable within an aperture 2 in a strike plate 1, Figures 13,14 in catching engagement, is also engagable behind the plate aperture to provide snagging longitudinal engagement Sbetween the plate and latch bolt to restrain the latch bolt from disengaging the S strike plate. This is achieved by having a concave channel 400 in the side of the S latch bolt comprising an exposed elongated concave recess extending from top to bottom of the side of the latch bolt said channel having an inclined wall 401 on Sthe leading side of the latch bolt which is engagable by the edge 402 of the plate i recess when the latch bolt is forced against this edge as commonly accurs during S attempted forced entry.

It will be appreciated that the removeably retainable barrel, the removeably Sretainable lever, the form of the snib lever, the remoe lock and jimmy resistant means are applicable to many locks apart from those described in detail herein.

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