NZ746323A - Mortice latch assembly - Google Patents
Mortice latch assembly Download PDFInfo
- Publication number
- NZ746323A NZ746323A NZ746323A NZ74632318A NZ746323A NZ 746323 A NZ746323 A NZ 746323A NZ 746323 A NZ746323 A NZ 746323A NZ 74632318 A NZ74632318 A NZ 74632318A NZ 746323 A NZ746323 A NZ 746323A
- Authority
- NZ
- New Zealand
- Prior art keywords
- detent
- latch assembly
- hub
- bolt
- housing
- Prior art date
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- 230000007246 mechanism Effects 0.000 claims abstract description 21
- 230000003993 interaction Effects 0.000 claims description 7
- 229910001209 Low-carbon steel Inorganic materials 0.000 claims description 5
- CWYNVVGOOAEACU-UHFFFAOYSA-N Fe2+ Chemical compound [Fe+2] CWYNVVGOOAEACU-UHFFFAOYSA-N 0.000 claims description 4
- 239000002184 metal Substances 0.000 claims description 3
- 229910052751 metal Inorganic materials 0.000 claims description 3
- 238000005381 potential energy Methods 0.000 claims description 3
- 239000010935 stainless steel Substances 0.000 claims description 3
- 229910001220 stainless steel Inorganic materials 0.000 claims description 3
- 239000000463 material Substances 0.000 description 7
- 230000009970 fire resistant effect Effects 0.000 description 3
- 238000009434 installation Methods 0.000 description 3
- 230000001788 irregular Effects 0.000 description 3
- 229910000639 Spring steel Inorganic materials 0.000 description 2
- 229910001297 Zn alloy Inorganic materials 0.000 description 2
- 230000015572 biosynthetic process Effects 0.000 description 2
- 238000005755 formation reaction Methods 0.000 description 2
- 230000002401 inhibitory effect Effects 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 230000009471 action Effects 0.000 description 1
- 238000007792 addition Methods 0.000 description 1
- 230000004075 alteration Effects 0.000 description 1
- 230000008901 benefit Effects 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000011900 installation process Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000008447 perception Effects 0.000 description 1
- 239000011800 void material Substances 0.000 description 1
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- Lock And Its Accessories (AREA)
Abstract
This invention relates to a mortice latch assembly 1 for mounting to a door 6 including a first hub 12 and a second hub 10 which are each operable to retract a bolt 33. The mortice latch assembly 1 also includes a lock mechanism including a detent 72 which takes the form of an elongate member. The detent is adjustable relative to the housing 8 between a first position and a second position. The detent 74 is also rotatable about its longitudinal axis between a first active position and a second active position.
Description
MORTICE LATCH ASSEMBLY
Technical Field
This invention relates to a mortice latch assembly for installation in a door
including a first hub and a second hub to move a bolt, a lock mechanism including a
detent that is adjustable between a first active position and a second active position,
so that the detent inhibits operation of the first hub or second hub respectively. The
mortice latch assembly provides a relatively simple option for a residential security
application and it will be convenient to hereinafter describe the invention with
reference to this application. It should be appreciated however that the mortice latch
assembly may have other applications.
Background of Invention
The lock security market can be segmented into various sections including
residential or commercial, and those sections can each be further segmented into
high or low security. The challenge for the operators, including the applicant, in the
security market is to supply security options at a price that will be acceptable. While
the high security commercial segment may accommodate a relatively high price for a
security option, the low security residential segment is much more price sensitive.
A further challenge for those mature operators that have a range of
security options, is attempting to create new security options that don’t overlap with
existing security options in such a way as to cannibalise the market for the existing
security options. More specifically it is preferable for mature operators to avoid
supplying a low cost security option which facilitates after-market modifications, say
by the retailer or installer, to suit a high security high cost option.
The residential segment of the security market can include both houses
and apartments. Apartments can require high security options for say at the external
access points to the building which might be maintained by the body corporate or
building manager. Whereas a relatively low security option may be all that is required
or expected for the for the access point to the apartment itself as selected or
maintained by the resident.
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One security option selected by residents of apartments includes a latch
assembly that when installed has the first hub is set to escape mode, while the
second hub remains lockable. The first hub would normally be operable from the
inside of the door, which the second hub would be operable from the outer side of the
door. This particular application can be found on locks installed on the front door of
apartments particularly where it is the only access point from within the building itself
to the apartment. It should be appreciated however, that depending on whether the
door is right-hand opening or left-hand opening, will dictate which hub is the first hub
and second hub respectively. Furthermore, depending on whether the apartment
door is inward opening or outward opening, left-hand opening or right-hand opening,
will dictate the slope of the bevelled leading surface of the latch bolt head. The
challenge for operators is supplying security options to satisfy these different
installations. It will be convenient to hereinafter describe the invention with reference
to this application.
A reference herein to a patent document or other matter which is given as
prior art is not to be taken as an admission that that document or matter was, in
Australia, known or that the information it contains was part of the common general
knowledge as at the priority date of any of the claims.
Summary of Invention
According to this invention there is provided a mortice latch assembly for
mounting in a door, including a housing, a bolt movable relative to the housing
between an extended position and a retracted position, an actuator including a first
hub and a second hub for operation from an inner side and an outer side respectively
of the door to move the bolt from the extended position to the retracted position, a
lock mechanism including a detent that is adjustable relative to the housing between a
first position and a second position so that in the first position the detent does not
inhibit operation of either the first hub or second hub, and also adjustable between a
first active position and a second active position so that when in the second position
the detent inhibits operation of the first hub or second hub respectively, wherein the
housing includes a front wall formed of mild steel, having an arm projecting towards a
body portion of the bolt, and including a faceplate formed of stainless steel that
overlies and extends parallel to the front wall of the housing. This arrangement is
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particularly suitable where the base is formed from a cast zinc alloy, as the mild steel
can maintain its integrity in supporting the bolt when the mortice lock is exposed to
high temperatures.
It is preferred that when in the second position the detent inhibits operation
of the first hub only or second hub only when in the first active position and second
active position respectively. This simplifies the componentry of the mortice lock and
reduces the overlap with existing security options. It is further preferred that the
housing is configured to permit adjustment of the detent between the first active
position and the second active position when in the first position. This arrangement
reduces the ability for the lock mechanism to be circumvented when mortice latch
assembly is installed. It is further preferred that the housing includes a base and a
cover which is fastened to the base, with the base and or cover including an aperture
providing the housing with said configuration through which the detent may be
adjusted between the first active position and the second active position when the
detent is in the first position and the cover is fastened to the base. It is often desirable
for a housing to be formed from components such as a base and a cover, and
allowing the adjustment of the detent while the housing remains assembled
contributes to having a simple installation process. The aperture may be located
anywhere on the housing, and one option is for the aperture to extend from the cover
to a rear wall of the base only. However the aperture may be located entirely on the
cover, or may be entirely located on the base.
The mortice latch assembly preferably includes a deadlatching mechanism
with an abutment that in an active position inhibits movement of the bolt from the
extended position to a retracted position and in an inactive position does not inhibit
movement of the bolt from the extended position to a retracted position, and an
auxiliary bolt that is movable in a direction parallel with the bolt between an extended
position and a retracted position, the auxiliary bolt including an arm portion that
engages the abutment when the auxiliary bolt is in the extended position to retain the
abutment in an inactive position. This arrangement reduces the ability for the bolt of
the mortice latch assembly to be tampered with while the door is closed. The
abutment preferably includes an abutment member that is formed from a non-ferrous
metal. The use of a non-ferrous metal for the abutment member makes it more
difficult for tampering with the deadlatch mechanism by magnetic forces when the
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mortice latch assembly is installed. The abutment member may move within the
housing in any suitable manner and one arrangement includes the abutment member
pivoting relative to the housing between the active position and the inactive position.
However the abutment member may, for example, slide linearly relative to the
housing. The arm portion of the auxiliary bolt may move rectilinearly relative to the
housing when the auxiliary bolt moves between the extended position and the
retracted position. This preferred arrangement can be achieved where the arm portion
is formed integrally with a body portion of the auxiliary bolt, which in turn creates
efficiencies in the manufacture of the latch bolt assembly. It is preferred that the
deadlatching mechanism include an auxiliary biasing member for biasing the auxiliary
bolt towards the extended position. The biasing member may take any suitable form
including a spring. The deadlatching mechanism may also include an abutment
biasing member for biasing the abutment towards the active position.
The detent is preferably configured to interact with the housing so as to
slide linearly between the first position and the second position. It is further preferred
that the detent be configured to interact with the housing so as to rotate about a
longitudinal axis of the detent when adjusting between the first active position and the
second active position. This arrangement allows the detent to be formed as a unitary
member which is relatively simple from a manufacturing perspective. It is further
preferred that the mortice latch assembly include a bi-stable arrangement which urges
the detent to adopt either the first active position or second active position. It is further
preferred that the bi-stable arrangement includes a detent biasing member which
engages the detent, with the detent shaped so that rotation of the detent through no
more than 45º causes the detent biasing member to store potential energy. This
arrangement reduces the likelihood of the detent inadvertently adjusting, or
unauthorised manipulation occurring. It is further preferred that the detent biasing
member also urges the detent to adopt either the first position or the second position.
It is further preferred that the bolt include a bolt head and a bolt body, the
orientation of the bolt head relative to the bolt body being adjustable by rotation
through 180º.
According to another aspect of this invention there is provided a lockset for
mounting to a door including a mortice latch assembly as hereinbefore defined, an
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inner handle assembly and an outer handle assembly each being operable to from an
inner side and outer side of the door for interaction with the first hub and second hub
respectively. It is preferred that the lockset include at least an outer cylinder lock
being operable from an outer side of the door for interaction with the lock mechanism
of the mortice latch assembly.
Brief Description of Drawings
It will be convenient to hereinafter describe the invention with greater detail
by reference to the attached illustrations. The attached illustrations show preferred
embodiments of the invention. The drawings, and the following detailed description,
are merely illustrative of how the invention might be put into effect. The specific form
and arrangement of the various features as shown is not to be understood as limiting
on the invention.
Detailed Description of Drawings
Future patent applications may be filed in Australia or overseas on the
basis of or claiming priority from the present application. It is to be understood that
the following provisional claims are provided by way of example only, and are not
intended to limit the scope of what may be claimed in any such future application.
Features may be added to or omitted from the provisional claims at a later date so as
to further define or re-define the invention.
Figure 1 is an isometric partially exploded view of a lockset according to
one aspect of this invention.
Figure 2 is an exploded isometric view of a mortice latch assembly
according to another aspect of this invention.
Figure 3 is a side elevation view of the mortice latch assembly with a cover
removed, and the bolt in an extended position.
Figure 4 is a side elevation view of the mortice latch assembly from Figure
3 with a second hub rotated to move the bolt to a retracted position.
Figure 5 is a side elevation view of the mortice latch assembly from Figure
3 with a detent of a lock mechanism shown in a second position.
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Figure 6 is a side elevation view of the mortice latch assembly from Figure
3 with the detent shown in a first position and in a first active position.
Figure 7 is a side elevation view of the mortice latch assembly from Figure
6 adjusted to show the detent now in a second position and first active position with
the second hub rotated to move the latch bolt to a retracted position.
Figure 8 illustrates a rear isometric view of the mortice latch assembly
showing a pin engaging the detent.
Figure 9 is a rear isometric view of the mortice latch assembly from Figure
8 with the detent rotated through 90 .
Figure 10 is a side elevation view of the mortice latch assembly from
Figure 3 showing the auxiliary bolt in an extended position.
Referring now to Figure 1 which illustrates the preferred embodiment of the
lockset according to one aspect of the invention which in summary includes a mortice
latch assembly 1, an inner handle assembly 2, an inner cylinder lock assembly 3 and
an outer cylinder lock assembly 4, and an outer handle assembly 5 for all of which is
configured for mounting to a door 6. The selection of the terms "inner" and "outer"
relate to an inner side and an outer side of the door. Figure 1 illustrates the door 6
being formed with a rectangular void 7 in a side edge thereof for accommodating the
housing 8 of the mortice latch assembly 1.
The door 6 is also illustrated as having a circular aperture 9 formed on an
outer surface thereof through which an outer spindle (obscured) of the outer handle
assembly 5 extends to engage a second hub 10 of the mortice latch assembly 1. An
equivalent circular aperture (obscured) would also be formed on an inner surface of
the door 6 for accommodating an inner spindle 11 of the inner handle assembly 2
which engages a first hub 12 (see Figure 2) of the mortice latch assembly 1. The
inner surface and outer surface of the door 6 would also require a pair of holes 13
bored on either side of the inner circular aperture 9 and outer circular aperture for
accommodating the pair of studs 14 and screws 15 extending from a rear of the inner
escutcheon 16 and outer escutcheon 17 respectively. Figure 1 also illustrates an oval
shape aperture 18 formed in an outer surface of the door 16 to allow an outer cylinder
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lock housing 19 to extend therethrough. An equivalent oval shaped aperture
(obscured) is formed on an inner surface of the door 6 for accommodating an inner
cylinder lock housing 20 therein. Each of the inner cylinder lock housing 20 and the
outer cylinder lock housing 19 are surrounded by an inner escutcheon 21 and an
outer escutcheon 22 respectively which are attached to each other by screw fasteners
23. Furthermore, each of the inner cylinder lock housing 20 and outer cylinder lock
housing 19 extend into the housing 8 through a respective oval shaped aperture 24
(only the outer oval shaped aperture is visible in Figure 1) for interaction with a lock
mechanism (obscured) which will be described in greater detail with reference to latter
illustrations.
The mortice latch assembly 1 is illustrated in an exploded view in Figure 2
to reveal the housing 8 is formed from a base 25, a cover 20, and a front wall 27. The
cover 26 can be positioned over the base 25 and attached thereto by way of four
screw fasteners 28. Furthermore, the front wall 27 can be attached to mounting
formations 29 formed on the base 25 by a pair of screw fasteners 30. Figure 2 also
illustrates a face plate 31 which can be positioned to overly the front wall 27 and
attached thereto by a pair of screw fasteners 32. While the base 25 and the cover 26
may be formed from any suitable material, the applicant has appreciated that there is
a perception of quality in the marketplace when these components are cast from a
zinc alloy. The face plate 31 may also be formed from any suitable material however,
it is preferred that it is formed from a stainless steel as this enhances the appearance
of the lock when installed, while being relatively resistant to malicious attack by a drill
or the like. The front wall 27 of the housing may also be formed from any suitable
material however, for reasons that will be explained later in the specification it is
preferred that it be formed from a relatively fire resistant material such as mild steel.
The bolt 33 as illustrated in Figure 2 is in the form of a bolt assembly which
in summary includes a latch bolt head 34, a body 35, a shaft 36 and a bolt biasing
spring 37. When the latch bolt assembly is assembled, the shaft 36 extends through
the centre of the biasing spring 37 so as to support and guide the spring 37 while the
bolt moves from an extended position to a retracted position. More specifically, the
shaft 36 inhibits the ability of the spring 37 to deviate from its central axis when
compressing. A distal end of the shaft 36 is located within a bore 38 formed in a
cylindrical boss at the rear surface of the latch bolt head 34. The cylindrical boss 39
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extends into an aperture (obscured in the drawings) formed at a distal end 40 of the
body 35. This arrangement allows the orientation of the latch bolt head 34 to be
adjusted through 180 relative to the body 35 so that the mortice latch assembly is
suitable for installation in either a right-hand opening door, a left-hand opening door,
an inwardly opening door or an outwardly opening door.
The shape of the latch bolt head 34 relative to the size of the opening 41 in
the front wall 27 is designed to allow the orientation of the latch bolt head 34 to be
adjusted without having to disassemble the housing 8. However, the shape of the
latch bolt head 34 relative to the opening 42 in the face plate 31 is designed to inhibit
rotation of the latch bolt head 34 whilst the face plate 31 is attached to the front wall
27. This arrangement inhibits tampering of the orientation of the latch bolt head 34
relative to the housing 8 particularly when the mortice latch assembly 1 is installed.
Figure 2 illustrates the first hub 12 and the second hub 10 which form part
of an actuator for moving the latch bolt from an extended position to a retracted
position. Both the first hub 12 and second hub 10 include a circular boss 43 (the boss
43 of the first hub is obscured in Figure 1) which locates in a circular aperture 44, 45
formed in the base 25 and cover 26 respectively, so as to allow the first hub 12 and
second hub 10 to rotate about an actuator axis X-X. The actuator illustrated also
includes a washer 46 acting as a bearing surface between the first hub 12 and
second hub 10, so as to reduce the likelihood of rotation of either the first hub 12 or
second hub 10 will result in rotation of the second hub 10 or first hub 12 respectively.
Both of the first hub 12 and second hub 10 include an upper arm 47 which is for
engagement behind a proximal end 49 of the latch bolt body 35 so as to provide a
direct engagement therebetween. Alternatively the actuator may include an
intermediate arm (not shown) between a first hub 12 and second hub 10 by providing
indirect engagement between the first hub 12 and second hub 10 and the latch bolt
assembly 37.
Each of the first hub 12 and second hub 10 includes a lower leg 50, 51
which is for abutting a hub return arrangement for urging each of the first hub 12 and
second hub 10 towards a rest position. The hub return arrangement may take any
suitable form and in the embodiment illustrated in Figure 2 includes a bar 52 and
compression spring 53 which compresses on rotation of either the first hub 12 or
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second hub 10. This operation of the hub return arrangement will be descried in
greater detail later in the specification. Clearly other arrangements are possible such
as torsion spring acting between either the first hub 12 or second hub 10 with the
base 25 and cover 26 respectively. However, the illustrated arrangement is preferred
as it is relatively simple to assemble.
The mortice latch assembly 1 illustrated in Figure 2 also includes a
deadlatching mechanism that when operable inhibits movement of the latch bolt 33
from the extended position that may be achieved by applying end pressure to the
latch bolt head 34. The operation of the detent mechanism will be described in
greater detail by reference to the latter illustrations, however from Figure 2 it can be
appreciated that the deadlatching mechanism includes an abutment 54 having an
aperture 55 therein for mounting to a stub shaft 56 formed on an inner surface of the
base 25. This allows the abutment 55 to pivot about the stub shaft 56, while a torsion
spring 57 is included to urge the abutment 54 to pivot towards an active position. The
deadlatching mechanism also includes an auxiliary bolt 58 having an auxiliary bolt
head 59 for extending through a slot 60 in the front wall 27 and a slot 61 in the face
plate 61. The auxiliary bolt 58 is urged towards an extended position under the action
of an auxiliary bolt biasing spring 62 acting between the auxiliary bolt 58 and the base
. The auxiliary bolt 58 includes an arm portion 63 that is formed integrally with the
auxiliary bolt head 59, with the arm portion 63 being arranged to engage the abutment
54 when the auxiliary bolt head 59 is in the extended position. The deadlatching
mechanism also includes a hub release member 64 having a bore 65 formed therein
for receiving a stub shaft 66 formed on an inner surface of the base 25, so as to
permit the hub release member 64 to pivot thereabouts. The hub release member 64
includes an upper arm 67 and a lower arm 68 angularly spaced from one another.
The lower arm 68 is for engagement with a shoulder 69, 70 formed on both the first
hub 12 and second hub 10 respectively, whilst the upper arm 67 is for engagement
with a lower leg 71 of the abutment 54. This interaction will be described in greater
detail with reference to latter illustrations.
The mortice latch assembly 1 illustrated in Figure 2 also includes a detent
72 which forms part of a lock mechanism which is illustrated in the form of an
elongate member. The detent 72 includes cylindrical central portion 73 which is
received in a semi-cylindrical recess 74 formed on an inner surface of the base 25.
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The body portion 73 is intended to slide within this recess 74 and guide the detent 72
as it moves relatively to the housing 8. This movement will be described in greater
detail with reference to latter illustrations.
The detent 72 illustrated in Figure 3 includes an upper portion which is
formed by a pair of spaced shoulders 75, 76 which are shaped and spaced to permit
interaction with a cam plate 77 in a manner that will be described during the
specification. A lower end of the detent 72 includes a formation that is configured to
interact with either the first hub 12 or the second hub 10 only depending on the
orientation of the detent 72 relative to the housing 8. A preferred arrangement
illustrated includes a pair of walls which extend perpendicular relative to each other to
form a corner, with only one of the walls being visible in Figure 2 and 3, while the
other wall can be appreciated with reference to Figure 6. This arrangement can
clearly take other physical forms other than a pair of walls.
The detent 72 illustrated in Figure 2 also includes an upper annular lower
groove 80 and a lower annular groove 81 spaced by an irregular octagon 82 (see
Figure 3). The detent 72 includes an upper socket 83 and a lower socket 84 (see
figure 5) that projects towards each other into the upper groove and lower groove
respectively. Each of the upper socket 83 and lower socket 84 each interact with a
detent biasing member 85 to create a bi-stable arrangement that will be described
later in the specification. It should be appreciated in Figure 2 however that the detent
biasing member 85 is formed from spring steel having a pair of opposed arms. Each
of the opposed arms includes a projection formed on an inner surface thereof
adjacent respective free ends. It ought to be appreciated that as the detent biasing
member 85 is formed from spring steel any flexing of the arms away from the position
as illustrated in Figure 2 will cause the detent biasing member to absorb potential
energy.
It should also be noted from Figure 3 that the detent 72 is formed with a
small bore 86 located adjacent the lower end thereof. The bore 86 can be aligned
with a groove 87 formed in a rear wall of the base 25, and with a groove 88 formed
adjacent an edge of the cover 26. This groove arrangement provides access to the
bore 86 whilst the housing 8 in assembled for reasons that will be explained later in
the specification.
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Referring now to Figure 3 which illustrates the mortice latch assembly
without the cover and latch bolt assembly body to reveal the deadlatching mechanism
with the abutment 54 in an active position. When the abutment 54 is in the active
position an upper arm 89 thereof is positioned between the latch bolt head 34 and the
stub shaft 56 inhibiting retraction of the latch bolt 33. It should also be noted from
Figure 3 that the auxiliary bolt 58 is in a retracted position so that the arm portion 63
thereof is disengaged from the upper arm 89 of the abutment 54. As a result the
abutment 54 is free to rotate about the stub shaft 56 under the influence of the torsion
spring 57, but only so far as would be allowed until the lower arm 71 of the abutment
54 engages an upper arm 67 of the hub release member 64. The hub release
member 64 is in turn prevented from rotating by its engagement with either the first
hub 12 or second hub 10, each of which are prevented from rotating an anti-clockwise
direction from the position illustrated in Figure 3 by engagement with a rear wall of the
housing.
Figure 3 also illustrates a support portion 90 of the front wall 22 which
extends up towards the shaft 36 of the latch bolt assembly. It can be appreciated
from Figure 2 that this support portion 90 is folded out from the front wall 27 and so is
formed integrally therewith. Where the front wall 27, and in particular the support
portion 90 is formed from a relatively fire resistant material, in conjunction with the
shaft 33 and the latch bolt head 34 are also formed from a fire resistant material, the
applicant has appreciated that the mortice latch assembly 1 can maintain some level
of integrity in the event of a fire. As indicated previously, it is preferred that the front
wall 27, and in particular the support portion 90 are formed by a mild steel.
Figure 3 illustrates the second hub 10, and it ought to be appreciated that
the first hub 12 is positioned behind the second hub in this view. Furthermore, the
detent 72 is illustrated in a raised, or hereinafter a first position, within the housing 8.
The rotational position of the cylinder cam 72 should be noted whereby the cylinder
cam 72 is engaging an upper shoulder 75 at of the detent. Furthermore, the detent
biasing member 85 is seated within the lower groove 81 of the detent 72 so as to
inhibit unauthorised movement of the detent from this first position. Furthermore, it
should be noted that the bar 57 of the hub biasing arrangement is engaging the lower
leg 51 of the second hub 10 and first hub 12 (obscured) under the influence of the
hub biasing spring 53.
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Turning now to Figure 4 we note that the second hub 10 has been rotated
in a clockwise direction. The lower arm 51 of the second hub 10 has moved the bar
52 of the hub biasing arrangement towards the front wall 27 of the housing thereby
compressing the hub biasing spring 53. Rotation of the second hub 10 has also
caused relative movement of the shoulder 70 relative to the hub release member 65
causing it to rotate in an anti-clockwise direction about the stub shaft 66. This has in
turn caused the abutment 54 to rotate in a clockwise direction about its stub shaft 66
raising the upper arm 89 away from the rear of the latch bolt head 34. With the upper
arm 89 in the raised position, the upper arm 48 of the second hub 10 can engage the
proximal end 49 of the latch bolt assembly body 35. As a result of the rotation of the
second hub 10 in a clockwise direction, the latch bolt assembly 33 is moved to the
retracted position. It should be noted that this rotation of the second hub 10 is
permitted as a result of the position of the detent 72 within the housing, and in
particular the lower end of the detent 72 being spaced from the second hub 10.
Turning now to Figure 5 which has had the latch bolt assembly body
removed for ease of understanding, it can be noted that the cylinder cam 77 has been
rotated through 90 so that it engages a lower shoulder 76 at the upper end of the
detent 72. The rotation of the cam 77 has caused the detent 72 to move axially from
the first position as illustrated in Figure 4, to a second position as illustrated in Figure
. In order to achieve this move the protrusion of the detent biasing member 85
needs to unseat from the lower groove 81, move across the ridge formed by the
irregular octagon 82 to seat within the upper groove 80. It is preferred that the shape
of the protrusion on the detent biasing member 85 relative to the shape of the ridge of
the irregular octagon 82 is such that movement of this type is bi-stable so that the
detent 72 is urged to adopt either the first or second position.
Figure 5 also illustrates the lower end of the detent 72 being positioned
relative to the second hub 10 so as to inhibit its rotation in the clockwise direction.
Whilst it is not apparent from Figure 5, the lower end of the detent is only preventing
rotation of the second hub 10, the lower end of the detent 72 as explained previously,
includes a pair of perpendicular walls 78, 79 so that whilst one of the perpendicular
walls 78 as illustrated in Figure 5 is preventing rotation of the second hub 10, the
other perpendicular wall 79 extending into the page is not positioned to prevent
rotation of the first hub 12. The detent 72 can be rotated about its longitudinal axis,
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however this cannot be achieved whilst the detent 72 is in the second position as
illustrated in Figure 5. As the bore 86 is not aligned with the groove 87, 88 in the
second position.
Figure 6 illustrates the detent 72 having been returned to the first position,
and once in this position the detent 72 can be rotated about its longitudinal axis.
Figure 6 also reveals now the other perpendicular wall 79, with the first perpendicular
wall 78 now extending out of the page. It ought to be appreciated that with the detent
72 in this rotational position, returning the detent to the second position as illustrated
in Figure 7, rotation of the first hub 12 would be prevented whilst rotation of the
second hub 10 would be permitted. This rotation of the detent 72 can only be
achieved whilst in the first position
It can be appreciated when comparing Figures 8 and 9 that a pin 91, such
as the pin that may be used to secure the cylinder lock 19, 20 to the housing 8 can be
temporarily inserted through the slot 87, 88 in the base 25 or lever 26 to engage the
bore 86 in the detent 72. The detent 72 can thereafter be rotated so as to adjust
between the first active position and the second active position.
Referring now to Figure 10 which illustrates the latch bolt assembly body
and part of the abutment 54 in dashed line, and it can be noted that the auxiliary
bolt 58 is in the extended position. With the auxiliary bolt 58 in the extended position,
such as may be the case when the door is open, the arm portion 63 of the auxiliary
bolt 58 engages with the upper arm 89 of the abutment. This engagement captures
and raises the upper arm 89 causing the abutment 54 to pivot in a clockwise direction
about the stub shaft 56 to thereby move the upper arm 89 away from the rear wall of
the latch bolt head 34. It ought to be appreciated that the arrangement of the
abutment 54, the latch bolt 33 and the auxiliary bolt 58 will allow the latch bolt head
34 and the auxiliary bolt head to engage a strike (not shown) and allow automatic
latching of the mortice latch assembly 1.
It ought to be appreciated from the foregoing that the mortice latch
assembly 1 as hereinbefore described provides a relatively simple option for a
residential security application. The ease and ability to adjust the orientation of the
latch bolt head 34 relative to the latch bolt body 35, in conjunction with adjustment of
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the detent between the first active position and second active position whilst the
housing 8 remains assembled would provide a particular benefit to those installing the
lock. Furthermore, the use of non-ferrous materials in the abutment facilitate an
inhibiting unauthorised manipulation thereof.
Various alterations and/or additions maybe introduced into the mortice
latch assembly as hereinbefore described without departing from the spirit or ambit of
the invention.
<filename>
Claims (19)
1. A mortice latch assembly for mounting in a door, including a housing, a bolt movable relative to the housing between an extended position and a retracted position, an actuator including a first hub and a second hub for operation from an inner side and an outer side respectively of the door to move the bolt from the extended position to the retracted position, a lock mechanism including a detent that is adjustable relative to the housing between a first position and a second position so that in the first position the detent does not inhibit operation of either the first hub or second hub, and also adjustable between a first active position and a second active position so that when in the second position the detent inhibits operation of the first hub or second hub respectively, wherein the housing includes a front wall formed of mild steel, having an arm projecting towards a body portion of the bolt, and including a faceplate formed of stainless steel that overlies and extends parallel to the front wall of the housing .
2. A mortice latch assembly according to claim 1 wherein when in the second position the detent inhibits operation of the first hub only or second hub only when in the first active position and second active position respectively.
3. A mortice latch assembly according to claim 1 or 2 wherein the housing is configured to permit adjustment of the detent between the first active position and the second active position when in the first position.
4. A mortice latch assembly according to claim 3 wherein the housing includes a base and a cover which is fastened to the base, with the base and or cover including an aperture providing the housing with said configuration through which the detent may be adjusted between the first active position and the second active position when the detent is in the first position and the cover is fastened to the base.
5. A mortice latch assembly according to claim 4 wherein the aperture extends from the cover to a rear wall of the base only.
6. A mortice latch assembly according to any one of the preceding claims including a deadlatching mechanism having an abutment that in an active position inhibits movement of the bolt from the extended position to a retracted position and in <filename> an inactive position does not inhibit movement of the bolt from the extended position to a retracted position, and an auxiliary bolt that is movable in a direction parallel with the bolt between an extended position and a retracted position, the auxiliary bolt including an arm portion that engages the abutment when the auxiliary bolt is in the extended position to retain the abutment in an inactive position.
7. A mortice latch assembly according to claim 6 wherein the abutment includes an abutment member that is formed from a non-ferrous metal.
8. A mortice latch assembly according to claim 7 wherein the abutment member pivots relative to the housing between the active position and the inactive position.
9. A mortice latch assembly according to any one of claims 6 to 8 wherein the arm portion of the auxiliary bolt moves rectilinearly relative to the housing when the auxiliary bolt moves between the extended position and the retracted position.
10. A mortice latch assembly according to any one of claims 6 to 9 including an auxiliary biasing member for biasing the auxiliary bolt towards the extended position.
11. A mortice latch assembly according to any one of claims 6 to 10 including an abutment biasing member for biasing the abutment towards the active position.
12. A mortice latch assembly according to any one of the preceding claims wherein the detent is configured to interact with the housing so as to slide linearly between the first position and the second position.
13. A mortice latch assembly according to any one of the preceding claims wherein the detent is configured to interact with the housing so as to rotate about a longitudinal axis of the detent when adjusting between the first active position and the second active position.
14. A mortice latch assembly according to claim 13 including a bi-stable arrangement which urges the detent to adopt either the first active position or second active position.
15. A mortice latch assembly according to claim 14 wherein the bi-stable arrangement includes a detent biasing member which engages the detent, with the <filename> detent shaped so that rotation of the detent through no more than 45º causes the detent biasing member to store potential energy.
16. A mortice latch assembly according to claim 15 wherein the detent biasing member also urges the detent to adopt either the first position or the second position.
17. A mortice latch assembly according to any one of the preceding claims wherein the bolt includes a bolt head and a bolt body, the orientation of the bolt head relative to the bolt body being adjustable by rotation through 180º.
18. A lockset for mounting to a door including a mortice latch assembly according to any one of the preceding claims, an inner handle assembly and an outer handle assembly each being operable to from an inner side and outer side of the door for interaction with the first hub and second hub respectively.
19. A lockset according to claim 18 including at least an outer cylinder lock being operable from an outer side of the door for interaction with the lock mechanism of the mortice latch assembly. <filename>
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
AU2017903692 | 2017-09-12 | ||
AU2017903692A AU2017903692A0 (en) | 2017-09-12 | Mortice latch assembly |
Publications (2)
Publication Number | Publication Date |
---|---|
NZ746323A true NZ746323A (en) | 2021-03-26 |
NZ746323B2 NZ746323B2 (en) | 2021-06-29 |
Family
ID=
Also Published As
Publication number | Publication date |
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AU2018229456B2 (en) | 2024-09-19 |
AU2018229456A1 (en) | 2019-04-04 |
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