AU5359500A - A lockset CEL&D - Google Patents

Description

Regulation 3.2

AUSTRALIA

Patents Act 1990 COMPLETE SPECIFICATION FOR A STANDARD PATENT

(ORIGINAL)

0 0 Name of Applicant: Actual Inventor(s): Address for Service: Invention Title: YARRA RIDGE PTY.LTD.

JOHN RUSSELL WATTS P O Box 275, Albert Park, 3206, Victoria, Australia "A Lockset CEL&D" Details of Associated Provisional Application(s): No(s): PQ 2450/99 filed 25 August, 1999 The following statement is a full description of this invention, including the best method of performing it known to us: \I I Field of the Invention This invention relates to locking and operating mechanisms for door locks Summary of the Invention The invention provides a lock for a moveable wing supported adjacent an opening including a lock body mountable to the interior face of the wing and a strike plate mountable to an element defining part of the opening, said lock body including a casing and an outwardly biased latch bolt of extended length supported in the casing and wherein when the lock body is mounted to the door the latch bolt engages the strike plate during movement of the door in a closing direction to restrain the lock body relative to the strike plate and thereby to restrain the door from being moved in an opening direction, said latch bolt being restrainable in a latching position before said engagement and subsequently being displaceable to an extended, deadlocked position where it protrudes a greater distance from the casing than the latching position and in which position it is deadlockable so it cannot be inwardly displaced by an S: 15 external load, means for deadlocking the latch bolt when the bolt has moved to the extended "position and further means for disabling the deadlocking means to enable the latch bolt to be retracted, operating means to unlatch the lock to disengage the latch bolt from the strike plate including an exterior key operable barrel and an interior angularly displaceable lever supported in the casing and locking means for restricting disengagement between the latch bolt and strike plate by restraining the interior lever operation.

The invention further provides a lock substantially as described herein with reference to and as illustrated in the accompanying drawings.

S"DescriDtion 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 a schematic side view of the lock, Figure 2 is a schematic plan view. of the lock Figure 3 is an isometric view of the lock and interior lever Figure 4 is a schedule of lock functions and related preferred components Figure 5 is a schematic side view of a lock, locked and waiting to be latched Figure 6 is a schematic side view of the lock of Fig 5 when latched Figure 7 is a schematic side view of the lock of Fig 6 when being unlatched Figure 8 is a schematic side view of the lock of Fig 7 when unlatched Description of Preferred Embodiments The invention provides a lock for many applications including timber domestic entrance doors where a surface mounted embodiment offers ease of fitting, a bolt of extended throw for better security and which electively is operable by an interior lever and an exterior lever and which electively has an interior and/or exterior locking cylinder. Aspects of the inventions are also applicable to other types of locks as will be noted.

An important embodiment of the invention derives from the common practice of homeowners of fitting a standard lockset to their front entrance door and a deadlock, such as a Lockwood 001 as well. An important embodiment combines the functionality of these two types of locks while providing better security than the above mentioned locks when acting together.

Reference is frequently made to this embodiment which includes a surface mounted lock body S'but mortise locks are also envisaged.

S: 15 The lock in an embodiment comprises an exterior handle assembly 1 (not shown) including an operable exterior handle 2 (not shown) which is connected to an interior lock body 3, (fitted to the interior face of the door), by a shaft 4 that passes through an aperture in the door.

In an embodiment there is an exterior cylinder 5 (not shown) having a key operable exterior barrel 6 (not shown). The exterior (also and herein, better referred to as an exterior) barrel (not shown) is connected to an unlatching cam 7 within the lock body by a cylinder shaft that passes through an aperture in the door. The bolt can always be retracted by operation of the exterior barrel. In a preferred embodiment, the exterior lever and cylinder housing are supported in the same external casing on the exterior of the door.

The lock body comprises a casing 8 with apertures 61 on the front edge 62 to permit passage of moveable bolts. It supports an outwardly biased bolt 9 (biased by springs 22) moveable between an engageable, extended position, Fig 6 where it protrudes from the casing and a disengaged, retracted position, Fig 8 where it is substantially within the casing and an intermediate latching position Fig 5 where the bolt is partly extended and restrained by detent means from further extending the normal position just prior to latching engagement. The casing also supports an outwardly biased auxiliary bolt 10 (biased by spring 25) which cooperates with the bolt to restrain the bolt in the partly extended latching position.

In an embodiment, there is an interior cylinder 11 (not shown) having a key operable interior barrel 12 and the lock body can be locked and unlocked by operation of the interior barrel. There may also be a cam 66 operably coupled to the interior barrel which has an armed extension 65. Preferably the said operable coupling provides some relative free movement.

The bolt on moving to the fully extended position Fig 6 automatically deadlocks whereby an inwardly directed load applied to the bolt will not cause the bolt to retract. The bolt can always be retracted from the extended position by operating the exterior barrel, (in embodiments having such a barrel).

In a preferred embodiment, he bolt can also be retracted to the disengaged position by operating the interior lever or the exterior lever when they are unrestrained (in embodiments having such levers) In a preferred embodiment, locking of the lock by operation of the interior barrel renders both °levers inoperable to retract the bolt and such a locked configuration can only be released from S° 15 this configuration by use of a key.

There is a strike plate 13 mountable to a doorjamb, an element comprising part of the door opening, which is preferably essentially the same as a commonly used night latch strike comprising a plate-like portion 14 which is screwed to the edge of the doorjamb and a boxlike portion 15 on the face of the doorjamb which is engaged by the bolt. Portion 15 has a recess 16 in which the bolt locates to engage after latching engagement during which the bolt is driven towards the retracted position by a ramped portion 17 on the outwardly disposed face of portion 16.

*o The bolt may have a square end 18, a beveled end on one side 19 or an end curved or beveled on both sides 20. It is restrainable by detent means in a latching position, comprising a fully retracted position if the bolt has a square end and preferably a partly extended position (it may be fully retracted) if the bolt is a single beveled or contoured on both sides, prior to latching to assist latching engagement whereby the bolt must be moved inwardly through contact with the strike plate to subsequently engage behind a peripheral shoulder 21 adjacent the recess.

The bolt, biased outwardly by spring 22, towards the centre of the lock has a engaging shoulder 23 and adjacent this is an auxiliary bolt 10 biased by spring 25 outwardly and having an aperture 26 comprised of a substantially horizontal portion 27 and an upwardly angled portion 28 within which locates a pinned protrusion 29 supported by, or comprising an extension to, a side of the casing, the pin acting to guide the movement of the auxiliary bolt.

Initial inward movement of the auxiliary bolt (from the unrestrained extended position) causes the portion 27 to slide over the pin and then further inward auxiliary bolt movement causes the ramped portion to slide over the pin and whereby the angled aspect 28 causes the auxiliary bolt (engageable shoulder) to displace away from the bolt.

The auxiliary bolt includes an engageable shoulder 30 which when the auxiliary bolt is extended lies in the path of the bolt engaging shoulder so as to engage the bolt and hold it partly extended or fully retracted as the case may be. On engagement with the strike plate by the auxiliary bolt, during latching engagement of the bolt, the auxiliary bolt is depressed and the mechanism is configured such that when so depressed the engageable shoulder is moved from the path of engageable shoulder movement so as to be unable to restrict bolt movement.

S Supported by a pin 31, being a rivet or pinned extension to the casing, and defining a pivotal axis, adjacent and below the bolt is a locking rocker 32 having a locking arm 33 and an actuating arm 34 said locking arm having a free end shoulder 35 and being biased by spring 36 towards the bolt. When the bolt is fully extended this arm pivots to locate shoulder behind a bolt shoulder 36 of the bolt to deadlock the bolt to restrict movement of the bolt in a retracting direction.

The actuating arm has an free end convex portion 17 and this portion locates within a mating concave portion 18 between wings of the drive cam 23 when the cam is undisplaced and the bolt is fully extended.

Initial rotation of the drive cam, (from an undisplaced position), in either direction causes either the upper 22 or the lower 23 winged portion to be displaced forward to cause the actuating arm 13B to displace anti-clockwise to disengage the end shoulder 14 from behind the bolt to enable further cam rotation to retract the bolt, the first part of the cam rotation un-deadlocks the bolt while further rotation draws the bolt inwardly against outward biasing by spring 22 The bolt has rearwardly a lower drive shoulder 20 which the lower wing engages to drive the bolt inwardly. The lower wing and an undisplaced drive shoulder are angularly disposed to have a small angular clearance to accommodate the initial movement of the drive cam which is required to un-deadlock the bolt. Similarly there is an upper drive shoulder but which is located further back to accommodate an arm of a cam 24 and a free drive end 25 of a rocker 26 interspaced between the upper drive shoulder and upper wing while providing the same angular clearance as the lower wing and drive shoulder Operation of the exterior cylinder by key in either direction causes the drive cam 23 to rotate to firstly withdraw the locking arm shoulder from behind the bolt and then cause either drive shoulder to be driven inwardly to retract the bolt, the cylinder barrel being operably coupled with free movement to the drive cam.

The bolt may also be caused to retract by movement of the rocker arm in a rearwardly direction as this causes the drive end to be displaced rearwardly. Either lever may be rotated to cause the rocker arm end to move rearwardly.

The rocker 26, from an undisplaced position, is moved to firstly engage the arm of cam 24 to angularly displace the unlocking cam 24 in a clockwise direction to cause a lower wing 27 of 15 cam 24 to move forward to rotate the locking rocker anticlockwise to dislodge the locking o- arm from the bolt shoulder and then further movement causes the end 25 drive shoulder to retract (the end 25, drive shoulder and wing in this movement displacing substantially as one.

Cam 24 unlike cam 23 only has a lower wing-like portion which mates with the convex locking arm portion similarly to the manner in which this convex portion mates with the cam

B.

Located adjacent and forward of the rocker annrm and below the rocker pivotal axis are two S: unlatching cams, an exterior cam 28 and an interior cam 29, which are supported adjacently within the casing and preferably coaxially, the axis being orthogonal to the plane of bolt movement and parallel to the axis of the rocker member.

The outer interior unlatching cam is connected to the interior lever 30 by a shaft 31 while the exterior unlatching cam is connected to the exterior lever 32 The interior unlatching cam comprises a triangular shaped rocker member 33 having end an upper shoulder 34 and a lower shoulder 35 adjacent a substantially straight edge portion of the rocker arm this straight edge portion extending above and below the axis 36 of the interior unlatching cam such that its rotation in either direction drives the rocker arm rearwardly. In an apex of the rocker 33 located substantially forward of the axis is a concave recess 37 which can accommodate and is engageable by a horizontally slideable pin 38 supported by the casing and which when within the recess 37 prevents the interior unlatching cam from being rotated to retract the bolt. This pin is connected to a hand operable button 39 located on the face of the lock to enable the button to be slid into and out of engagement.

The exterior unlatching cam comprises a rectangular shaped member having an upper shoulder 40 and a lower shoulder 41 adjacent a straight edge portion of the rocker arm, and preferably portion 35, this straight edge portion extending above and below the axis of the exterior unlatching cam such that its rotation in either direction drives the rocker arm rearwardly. On the lower end of this cam is an engageable recess 42 which is engageable by a shoulder 43 of a locking slide 44 to prevent movement of this cam.

The locking slide supported in the casing between finned extensions 45 to the casing wall, and in a plane parallel to that of the rocker has a recess in which a cam operably coupled to the interior key operable barrel locates to enable the locking slide to be moved by barrel operation towards and/or away from the bolt.

The locking slide has a ramped end portion, ramp 46 adjacent the slideable pin and a protruding shoulder 50 adjacent the recess of the exterior unlatching cam such that movement from an undisplaced position of the locking slide away from the bolt, in normal operation, causes the ramped portion to drive the pin sideways into engagement with the exterior cam while causing the shoulder to engage within the recess of the interior cam to lock both cams to restrain them from moving. Movement of the slide in the opposite direction, towards the bolt, causes withdrawal of the shoulder 50 to enable the interior cam while leaving the pin in •engagement to retain the exterior cam restrained.

A ball 51, supported within a horizontal slotted recess 52 within the casing and biased towards the locking slide by a spring 53 restrains the locking slide in one of two positions determined by two concave recesses 54 in the side of the locking slide in one position the slide in the undisplaced and in the other it is in the locking position.

The slide has an end portion 55 that extends across a plate-like portion 56 of the bolt the plane of this portion and that of the plate being parallel and in close proximity. Projecting from the slide end portion towards the plate is a pinned protrusion 56. Pivotally supported on the plate 56 is an unlocking rocker 57 comprising two arm substantially at right angles.

The first rocker arm 58 pointing rearwardly from the pivotal axis 59 located towards the top of the plate has a ramped end 60 while the end of the second arm 61 has a forward projection 62 that is engageable with the internal wall of the casing.

These components are so configured such that when the locking slide is undisplaced the bolt can move through the extremes of movement without the unlocking arm being affected but if the locking slide is moved to the locked position when the bolt is in the partly extended position (the backwardly pointing unlocking arm with the ramped end being orientated to be substantially horizontal by the previous unlatching operation) and the door is subsequently closed the bolt and auxiliary bolts are displaced by the strike plate and then the bolt is driven by the springs to a fully extended position in which the locking armn engages the bolt and during which movement the forward projection of the unlocking arm enagages the casing and angularly displaces the first unlocking arm so that the pointed end of the ramped portion lies above the height of the slide end pin. When the bolt is retracted by operation of the exterior cylinder the ramped portion engages above the pin and urges it towards the bolt such that the slide becomes unlocked. When the bolt is moved to the fully retracted position a reset pin 63 of the casing engages the second arm to cause the unlocking rocker to angularly displace so that the first arm becomes substantially horizontal.

S The lock described above provides the functionality of a preferred embodiment (as listed in the attached schedule) but other functionality can be achieved by the omission of features or components or the addition of components. By way of example only: if the shoulder 43 is omitted so that the locking slide does not engage the interior cam then the interior lever can be operated at all times to retract the bolt.

the exterior lever may be omitted so that the lock can only be exteriorly unlatched by key operation.

S:o the pin 56 may be omitted such that retraction of the bolt does not displace the locking slide to the unlocked position e the end of the locking slide may comprise an angled slot within which the pin 38 locates so that when the locking slide is moved towards the bolt the both cams become unrestrained and able to be rotated by lever operation.

either the interior barrel or the exterior barrel may be omitted the locking slide may be omitted the interior lever and exterior levers are restrained so that neither lever may be operated to retract the bolt from the extended, deadlocked configuration.

The ramped locking slide end may be omitted so the locking slide cannot cause the exterior lever to be restrained from movement It is preferable that changes in functionality be achieved by use of a commonly available tool which can be used at the time of fitting. By way of example Throughout this specification and claims which follow, unless the context requires otherwise, the word" comprise" and variations such as "comprises" or "comprising", will be understood to imply the inclusion of a stated integer or group of integers or steps but not the exclusion of any other integer or group of integers and the positional prepositions such as up, down, rear which are used to assist in description of the preferred embodiments have in general no absolute significance.

It should also be stated that the free end 25 and the cam 24 preferably engages with a shoulder 20A of the latch bolt on a side opposite from the side the wing 22 engages, i.e. the latch shoulder preferably protrudes from both sides of the latch bolt to be engaged on one side by the wing and on the opposite side by the rocker 26 end 25 with the arm of 24 interspaced between 25 and 22A. This latter construction, as shown in Fig. 8, enables the cam 23 to be rotated by external key operation to retract the bolt without displacing the rocker arm 26. In other preferred embodiments the ramped end 60 may be replaced by a radiussed end.

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