NZ599121B - Lock body - Google Patents
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- NZ599121B NZ599121B NZ599121A NZ59912112A NZ599121B NZ 599121 B NZ599121 B NZ 599121B NZ 599121 A NZ599121 A NZ 599121A NZ 59912112 A NZ59912112 A NZ 59912112A NZ 599121 B NZ599121 B NZ 599121B
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- Prior art keywords
- handle
- lock bolt
- lock body
- lock
- latch
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Abstract
599121 Disclosed is a multi-point mortise lock body for a hinged door or window to allow locking of without use of a key. The lock body includes a casing; a first handle arranged on a first side of the casing; a second handle arranged on an opposed second side of the casing; a locking mechanism mounted to the casing; and a latch slidably mounted to the casing and biased to an extended latching position. The latch is retractable against the bias by operation of either one of the first side handle and the second side handle to an unlatched position; a lock bolt slidably mounted to the casing for movement between an extended locking position and a retracted unlocked position. The lock bolt is operably associated with the locking mechanism and the second side handle that is configured to be movable between a neutral position where the latch is extended, an opening position where the latch is retracted, and a second position where the lock bolt is extended. When the lock bolt has been extended to the locked position by the second side handle the lock bolt can be retracted by either the locking mechanism or the second side handle, and when the lock bolt has been extended by the locking mechanism the lock bolt can only be retracted by the locking mechanism. The locking mechanism includes a key-operated lock cylinder extending through the casing from the first side to the second side of the door. nted to the casing; and a latch slidably mounted to the casing and biased to an extended latching position. The latch is retractable against the bias by operation of either one of the first side handle and the second side handle to an unlatched position; a lock bolt slidably mounted to the casing for movement between an extended locking position and a retracted unlocked position. The lock bolt is operably associated with the locking mechanism and the second side handle that is configured to be movable between a neutral position where the latch is extended, an opening position where the latch is retracted, and a second position where the lock bolt is extended. When the lock bolt has been extended to the locked position by the second side handle the lock bolt can be retracted by either the locking mechanism or the second side handle, and when the lock bolt has been extended by the locking mechanism the lock bolt can only be retracted by the locking mechanism. The locking mechanism includes a key-operated lock cylinder extending through the casing from the first side to the second side of the door.
Description
Patent Form No. 5 Our Ref: 66723NZP00
No. 2011901215
Date. 01 Apr 2011
Patents Act 1953
C O M P L E T E S P E C I F I C A T I O N
LOCK BODY
I/We, Trend Windows & Doors Pty Limited, a body corporate organised under the laws of Australia of
44-52 Mandoon Road, Girraween, New South Wales, 2145, AUSTRALIA
hereby declare the invention, for which I/we pray that a patent may be granted to me/us, and the
method by which it is to be performed, to be particularly described in and by the following statement:-
Total Fee Paid: NZ$250.00 – by Direct Debit (as per covering letter)
503487211_1/6858
LOCK BODY
TECHNICAL FIELD
This invention relates to security devices for residential, commercial
and industrial buildings. More particularly, the present invention relates to locks
for hinged doors and windows.
The invention has been developed primarily for use as a multi-point
mortise lock and will be described hereinafter with reference to this application.
However, it will be appreciated that the invention is not limited to this particular
field of use.
BACKGROUND TO THE INVENTION
Any discussion of the prior art throughout the specification should in no
way be considered as an admission that such prior art is widely known or forms
part of common general knowledge in the field.
Residential, commercial and industrial buildings commonly include one
or more doors which are hinged to a door frame such that the door can pivot
between closed and open positions.
One type of lock for such hinged doors or windows includes a locking
tongue and deadbolt. Typically, the locking tongue is biased to an extended
latching position. The locking tongue is retracted against the biasing force by an
internal handle or an external handle.
Known locks are typically focused towards inhibiting unauthorised
access to the building. Accordingly, it is generally required to use a key to unlock
a deadbolt from either an external side or an internal side of the door. The
requirement to use a key to unlock a door from inside a room or a building can
lead to difficulties in the event of an emergency or otherwise can be generally
inconvenient if the relevant key is readily located. This can lead to serious injury
or even death in the case of a fire to a building. Even if the key is readily
available, a user can go into a state of panic in emergency situations rendering
them unable to unlock the door quickly and efficiently.
Furthermore, some known door locks include small devices for
indicating the status or mode of the lock of a door or window. However, these
devices are typically not sufficiently robust and can be difficult to see at a glance.
Again, these characteristics are undersirable in the event of an emergency and
can lead to undesirable consequences to a person inside a room or building.
It is an object of the present invention to overcome or substantially
ameliorate one or more of these disadvantages of the prior art, or at least to
provide a useful alternative.
SUMMARY OF THE INVENTION
According to a first aspect of the invention, there is provided a lock
body for a hinged door, the lock body including:
a casing;
a first handle arranged on a first side of the casing;
a second handle arranged on an opposed second side of the casing;
a locking mechanism mounted to the casing;
a latch slidably mounted to the casing and biased to an extended
latching position, the latch being retractable against the bias by operation of
either one of the first side handle and the second side handle to an unlatched
position;
a lock bolt slidably mounted to the casing for movement between an
extended locking position and a retracted unlocked position, the lock bolt being
operably associated with the locking mechanism and the second side handle;
wherein the second side handle is configured to be movable between a
neutral position where the latch is extended, an opening position where the latch
is retracted, and a second position where the lock bolt is extended; and wherein,
when the lock bolt has been extended to the locked position by the second side
handle the lock bolt can be retracted by either the locking mechanism or the
second side handle, and when the lock bolt has been extended by the locking
mechanism the lock bolt can only be retracted by the locking mechanism.
The casing is preferably adapted for mounting within a recess formed in
the free edge of the door (i.e. the edge opposite the hinged edge). In some
preferred embodiments, the casing is received in the recess so as to be
substantially flush with the free edge of the door. Preferably, the lock body is
configured as a mortise lock.
In some preferred embodiments, the casing has a rear backing plate, a
top backing plate and a side plate. Preferably, one or more spacers are mounted
between the rear and top backing plates to hold the rear and top backing plates
in fixed spaced apart relation.
Preferably, the locking mechanism includes a key-operated lock
cylinder extending through the casing from the first side to the second side of the
door, the locking mechanism being selectively operable to move (e.g. slide) the
lock bolt between its extended locking position and its retracted unlocked
position. The ends of the lock cylinder may project past the rear and top backing
plates of the casing so as to be substantially flush with the respective internal and
external sides of the door, or to project past and be proud of the surfaces of the
respective sides of the door.
The key-operated lock cylinder is preferably configured to be operated
from either side of the door (i.e. internal and external sides). For example, as will
be described in greater detail below, key operation of the lock cylinder from an
external side of the door can be used to facilitate unlocking of the door so as to
permit entry into a room. Similarly, key operation of the lock cylinder from an
internal side of the door can be used to facilitate unlocking of the door so as to
facilitate exiting from a room.
Preferably, the key-operated lock cylinder has a rotatable member for
effecting movement of the lock bolt between the locking and unlocked positions
via key operation of the cylinder. The rotatable member may directly or indirectly
engage the lock bolt such that its rotation causes a linear displacement of the
lock bolt.
Preferably, the first handle is arranged on the external side of the door.
The first handle is preferably biased to a neutral position in which the latch is in
its extended latching position. In some preferred embodiments, the first handle is
biased to the neutral position by a first handle spring. Preferably, the first handle
spring is a torsion spring or a compression coil spring.
In some preferred embodiments, the first handle is rotatably mounted to
the casing such that the first handle can be selectively rotated and moved from
the neutral position to an opening position to cause the latch to retract, or at least
partially retract, into the casing so as to not interfere with the door frame.
In certain preferred embodiments, the first handle is adapted to lie in a
substantially horizontal orientation when in the neutral position. The first handle
is preferably movable (e.g. rotatable) from the neutral position through an angle
in the range of between approximately 40 to 90 degrees for retracting the latch to
the unlatched position. Preferably, the first handle can rotate by approximately
45 to 70 degrees, more preferably within the range of approximately 45 to 60
degrees from the neutral position. In some preferred embodiments, the first
handle extends in a substantially vertical direction when it is rotated through its
maximum angle of rotation away from the neutral position. It will of course be
appreciated that the angle through which the handle can rotate is not limited to
those values recited above, but rather can be configured to suit the requirements
of a particular application, as desired. When the first handle is released it
automatically returns to the neutral position under the action of the first handle
spring.
Preferably, the second handle is arranged on the internal side of the
door for facilitating exit from the room. The second handle is preferably movable
between a neutral position in which the latch is extended, an opening position in
which the latch is retracted and a second position in which the lock bolt is
extended. Preferably, the second handle is movable from the neutral position in
a first direction to an opening position to effect retraction of the latch.
In some preferred embodiments, the second handle is rotatably
mounted to the casing such that the second handle can be selectively rotated
and moved from the neutral position to the opening position to cause the latch to
retract, or at least partially retract, into the casing so as to not interfere with the
door frame.
The second handle is preferably biased to return from the opening
position to the neutral position. In some preferred embodiments, the second
handle is biased to the neutral position by a second handle spring. Preferably,
the second handle spring is a torsion spring or a compression coil spring.
Preferably, the second handle is movable from the neutral position in a
second direction to the second position to extend and retain the lock bolt in the
locked position to secure the door. The second handle is preferably configured
to require manual operation to return it to the neutral position, rather than being
biased to return to the neutral position from the second position. It will therefore
be appreciated by those skilled in the art that preferred embodiments of the
second handle are advantageously configured to provide a secure latching mode
(or “night latching mode”) whereby a user can securely lock the door from inside
without requiring use of a key.
In particular, it will be appreciated that by retaining the second handle
in the second position the lock bolt will be held in its thrown or extended position
so that the door can be secured, from the inside without use a key, whilst still
requiring a key to unlock the door from the external side of the door (e.g. from
outside the room or building to which the door is mounted). This provides the
“night latching” feature described above and enables a user to readily secure the
door from the inside, yet enabling the door to opened quickly and efficiently by
hand-operation in the event of an emergency (e.g. fire) when use of a key can be
difficult due to stress and panic associated with the situation, resulting in valuable
time being lost to escape the imminent danger. Furthermore, it avoids the need
to locate the key in such emergency situations.
It will also be appreciated that when the second handle is in the second
position it provides a clear visual indication to a user that the lock bolt is in its
extended locking position, but that a key is not required to exit the room. Again,
this visual indication is advantageous in the event of an emergency. At other
times, it is a convenient feature for assessing whether or not a key is required to
retract the lock bolt.
In its preferred embodiment, the second handle can be used to open
the door by moving it from the second position to the neutral position to thereby
retract the lock bolt. Further rotation of the handle to move the second handle
from the neutral position to the first position retracts the latch, thereby releasing
the door and allowing the user to swing the door open on its hinges so that
passage may be made from the room through the doorway.
It will therefore be appreciated by those skilled in the art that the lock
bolt advantageously provides secure locking of the door whereby the door will
remain locked even if the first handle is operated from the outside to release the
latch, whilst the latch provides a means to hold the door in a closed position but
be readily opened from either side of the door by using the first or second handle
to retract the latch from its extended latching position.
Preferably, the latch is biased to its extended latching position by a
latch spring. In some preferred embodiments, the latch spring is a coil spring or a
leaf spring. The latch spring is preferably mounted over a shaft extending from a
rear face of the latch. Preferably, the latch, latch spring and shaft are mounted to
a mounting bracket associated with the top backing plate. A spring spacer is
preferably provided between a head of the shaft and the mounting bracket to
preload the latch spring.
The latch preferably has a tapered, chamfered or rounded face so as to
enable the latch to retract as the door passes the doorframe as the door swings
to its closed position. A striker plate may be provided on the door frame so that
the latch strikes the plate, rather than the door frame. The striker plate preferably
has one or more openings through which the latch and lock bolts may pass so as
to be received in a corresponding recess or recesses in the door frame.
Preferably, the lock bolt is in the form of a rectangular prism which is
configured to be received in the correspondingly shaped recess in the doorframe
(and to pass through the corresponding opening in the striker plate if one is
provided).
Preferably, the casing houses a drive mechanism interconnecting and
defining the working interrelationship between the lock bolt, the key-operated lock
cylinder, the first side handle and the second side handle.
The drive mechanism preferably includes a split-pin arrangement for
enabling selective independent operation of the first and second side handles to
retract the latch and/or extend the lock bolt. Preferably, the split-pin arrangement
comprises a first spigot extending from the first handle and a second spigot
extending from the second handle. The first and second handles are preferably
arranged so that the first and second spigots are substantially coaxially aligned
and define an axis of rotation for the first and second handles.
Preferably, the drive mechanism preferably includes a cam mechanism
associated with the split-pin arrangement for enabling selective independent
operation of the key-operated lock cylinder and the second side handle to extend
or retract the lock bolt.
The cam mechanism preferably includes two or more rotatably
mounted cam-type elements. The cam-type elements are preferably mounted to
the first and second spigots to be rotatable about the axis of rotation of the first
and second handles.
In some preferred embodiments, the cam mechanism includes three
axially aligned cam-type elements, including an inside arm, a middle arm and an
outside arm. The outside arm is preferably mounted to the first spigot of the first
handle (e.g. external handle) such that operation of the first handle causes a
corresponding rotation of the outside arm to retract the latch.
Preferably, the inside arm and middle arm are mounted to the second
spigot of the second handle (e.g. internal handle) such that operation of the
second handle in a first direction to its opening position causes a corresponding
rotation of the middle arm to retract the latch, and operation of the second handle
in a second direction to its second position causes a corresponding rotation of
the inside arm to extend the lock bolt to its locking position. In certain
embodiments, a washer is provided between the inside arm and middle arm.
In certain preferred embodiments, the lock body includes an auxiliary
securing mechanism. The auxiliary securing mechanism preferably includes one
or more auxiliary securing elements such as, for example, securing pins, studs,
bolts, anchors, throw bolts or the like for securing the door at one or more
additional locations about the door frame and/or to the floor (i.e. in addition to the
latch and lock bolt).
In certain preferred embodiments, the auxiliary securing mechanism
includes a top actuating arm and a bottom actuating arm operatively associated
with the lock bolt and mounted for sliding movement relative to the casing
between extended and retracted positions. Preferably, the top and bottom
actuating arms are adapted to slide in opposite directions to each other. The top
and bottom actuating arms are preferably configured to slide in unison.
Preferably, the inside arm of the cam-mechanism engages an engaging
formation such as, for example, a notch in the bottom actuating arm such that
rotation of the inside arm causes a corresponding sliding movement of the bottom
arm and thus the associated auxiliary securing element.
Preferably, each actuating arm has a mounting formation for mounting
one or more extension arms, whereby an auxiliary securing element can be
attached to the distal end of each extension arm. The extension arms are
preferably threadedly engagable with the mounting formations. In other
embodiments, the distal end of each extension arm defines the auxiliary securing
element.
The auxiliary securing mechanism is preferably adapted to operate in
tandem with the lock bolt. Preferably, the auxiliary securing elements are
configured to move between extended and retracted positions simultaneously
with the extension and retraction of the lock bolt. That is, the auxiliary securing
mechanism is preferably adapted to be selectively operated by one of the key-
operated lock cylinder or the second handle.
In some preferred embodiments, the top actuating arm has a top arm
slot for receiving an external side pin connected to the lock bolt. The external
side pin is also received in a slot of the rear backing plate, the top arm slot being
angled relative to the rear backing plate slot such that movement of the lock bolt
causes the top actuating arm to be linearly displaced in a direction substantially
normal to the direction of movement of the lock bolt.
In certain preferred embodiments, the bottom actuating arm has a
bottom arm slot for receiving an internal side pin connected to the lock bolt. The
internal side pin is also received in a slot of the top backing plate, the bottom arm
slot being angled relative to the top backing plate slot such that movement of the
lock bolt causes the bottom actuating arm to be linearly displaced in a direction
substantially normal to the direction of movement of the lock bolt.
Preferably, the auxiliary securing elements connected to top and
bottom actuating arms are configured to engage points above and below the
door, respectively, to provide additional securing of the door.
In other preferred forms, the auxiliary securing mechanism includes
side securing elements extending substantially perpendicular to the top and
bottom securing elements for securing the door at additional points adjacent the
free and hinged edges of the door. Preferably, the four extension arms are
preferably attached to so as to be radially spaced apart by an angle of
approximately 90 degrees about a central axis of the mounting member.
Unless the context clearly requires otherwise, throughout the
description and the claims, the words “comprise”, “comprising”, and the like are to
be construed in an inclusive sense as opposed to an exclusive or exhaustive
sense; that is to say, in the sense of “including, but not limited to”.
According to a second aspect of the invention, there is provided a multi-
point lock body for a hinged door having a first side handle and a second side
handle, the lock body including:
a casing;
a locking mechanism mountable to the casing;
a latch slidably mounted to the casing and biased to an extended
latching position, the latch being retractable against the bias by operation of
either one of the first side handle and the second side handle to an unlatched
position;
a lock bolt slidably mounted to the casing for movement between an
extended locking position and a retracted unlocked position, the lock bolt being
operably associated with the locking mechanism and the second side handle;
wherein, when the lock bolt has been extended to the locked position
by the second side handle the lock bolt can be retracted by either the locking
mechanism or the second side handle, and when the lock bolt has been
extended by the locking mechanism the lock bolt can only be retracted by the
locking mechanism.
BRIEF DESCRIPTION OF THE DRAWINGS
A preferred embodiment of the invention will now be described, by way
of example only, with reference to the accompanying drawings in which:-
Figure 1 shows an exploded assembly view of an embodiment of the
multi-point lock body according to the invention;
Figure 2 is a perspective view of an embodiment of the multi-point lock
body according to the invention;
Figure 3 is perspective view of the multi-point lock body of Figure 2, in
the unlocked configuration;
Figure 4 is a perspective view of the multi-point lock body showing the
internal handle moving to its opening position;
Figure 5 is a perspective view of the multi-point lock body showing the
extension of the lock bolt and auxiliary locking arms by key operation of the lock
cylinder;
Figure 6 is a perspective view of the multi-point lock body showing the
retraction of the lock bolt and auxiliary locking arms by key operation of the lock
cylinder;
Figure 7 is a perspective view of the multi-point lock body in a night
latching mode with the internal handle moved to its second position to extend the
lock bolt and auxiliary securing arms;
Figure 8 is a perspective view showing retraction of the lock bolt and
auxiliary securing arms by manually returning the internal handle to the neutral
position;
Figure 9 is a perspective view showing the multi-point lock body being
unlocked from it night latch position by key operation from an external side of the
door;
Figure 10 shows a sequence of steps for assembling various parts of
the multi-point lock body; and
Figure 11 shows a further sequence of steps in the assembly process.
PREFERRED EMBODIMENT OF THE INVENTION
Referring to the drawings, the present invention provides a multi-point
lock body in the form of a mortise lock 1. The mortise lock 1 is particularly suited
for use on a hinged door (not shown) and will be described hereinafter in relation
to this application of the lock. However, it will be readily appreciated by those
skilled in the relevant art that the mortise lock 1 could be readily adapted for other
security applications with residential, commercial or industrial buildings, including
use with windows.
In the following description, the lock 1 will be described as mounted on
a free edge (i.e. the edge opposite the hinged edge) of the door. The door will be
described as hinged to one side of a door frame so that the door can swing about
the hinges between open and closed positions for permitting entry to and exit
from a building or room as required.
The mortise lock 1 includes a casing 2 sized to be received in, and sit
flush with, a recess formed in the free edge of the door. The casing is
substantially in the form of a rectangular prism and generally of hollow
construction so as to facilitate housing of the various components of the mortise
lock 1, as will be described in detail below.
As most clearly shown in Figure 1, the casing 2 has a rear backing
plate 3, a top backing plate 4 and a side plate 5. Preferably, one or more
spacers 6 are mounted between the rear and top backing plates (4, 3) to hold the
rear and top backing plates in fixed spaced apart relation so as to form the
rectangular prism structure.
The mortise lock 1 includes a locking mechanism in the form of a key-
operated lock cylinder 7 extending through the casing 2. As shown in Figure 2,
the ends of the lock cylinder 7 project past the rear and top backing plates (4, 3)
of the casing 2 and are proud of the surfaces of the respective sides of the door.
The key-operated lock cylinder 7 is configured to be operated from
either side of the door (i.e. internal and external sides). For example, as will be
described in greater detail below, key operation of the lock cylinder from an
external side of the door can be used to facilitate unlocking of the door so as to
permit entry into a room. Similarly, key operation of the lock cylinder from an
internal side of the door can be used to facilitate unlocking of the door so as to
facilitate exiting from a room.
With reference to Figure 2, a first side handle 8 is arranged on an
external side of the door and a second side handle 9 is arranged on an internal
side of the door.
The mortise lock 1 further includes a latch 10 and lock bolt 11, both
mounted for sliding movement relative to the casing 2. The side plate 5 of the
casing 2 has openings (12, 13) through which the latch 10 and lock bolt 11 can
pass, respectively. A spacer ‘S’ is arranged in the casing between the top and
rear backing plates (4, 3). The spacer ‘S’ provides a platform for positioning and
guiding the lock bolt 11 at a desired position between the top and rear backing
plates.
The latch 10 is slidably mounted to the casing 2 and biased to an
extended latching position by a coil latch spring 14, as shown in Figure 3. The
latch 10 is retractable against the bias by operation of either one of the first side
handle 8 and the second side handle 9 to an unlatched position, as indicated by
the arrow ‘X’ shown in Figure 4.
As shown in Figure 1, the latch 10 is mounted to a mounting bracket 15
integrally connected with the top backing plate 4. To facilitate mounting of the
latch 10, a shaft 16 is threaded into the rear of the latch 10. The latch spring 14
is mounted on the shaft 16 so as to be held between the rear face of the latch 10
and the mounting bracket 15. A spring spacer 17 is provided between a head 18
of the shaft 16 and the mounting bracket 15 to compress and preload the latch
spring 14 and thereby provide the desired force for biasing the latch to the
extended position.
The latch 10 has a rounded leading face 19 which helps to retract the
latch as the door passes the doorframe as the door swings to its closed position.
A striker plate (not shown) is preferably provided on the door frame so that the
rounded leading face of the latch strikes the plate, rather than the door frame.
The striker plate has openings aligned with the openings (12, 13) of the side plate
for allowing the latch 10 and lock bolt 11 to pass and be received in
corresponding recesses in the door frame to secure the door.
The lock bolt 11 is slidably mounted to the casing 2 for movement
between an extended locking position as shown in Figure 5, and a retracted
unlocked position as shown in Figure 6. As will be described in greater detail
below, the lock bolt 11 is operably associated with the key-operated lock cylinder
7 and the second (internal) handle 9. The lock bolt 11 is in the form of a
rectangular prism and is configured to be received in the correspondingly shaped
recess in the doorframe.
As most clearly shown in Figure 1, the key-operated lock cylinder 7 has
a rotatable member 20 for effecting movement of the lock bolt 11 between the
locking and unlocked positions via key operation of the cylinder 7. The rotatable
member 20 engages the lock bolt 11 such that its rotation causes a linear
displacement of the lock bolt, between the locking and unlocked positions. In the
views of the embodiment illustrated in the accompanying drawings, counter-
clockwise rotation of the key in the lock cylinder causes a corresponding counter-
clockwise rotation of the rotatable member 20 which displaces the lock bolt 11 to
the left to its extended position. Similarly, clockwise rotation of the key causes a
corresponding clockwise rotation of the rotatable member 20 which displaces the
lock bolt 11 to the right to its retracted position.
The first handle 8 is arranged on the external side of the door and is
biased to the neutral position (e.g. horizontal) shown in Figure 2 in which the
latch 10 is in its extended latching position. The first handle 8 is rotatably
mounted to the casing 2 such that the first handle 8 can be selectively rotated
and moved from the neutral (horizontal) position to an opening position to cause
the latch 10 to retract into the casing 2 so as to not interfere with the door frame.
The second handle 9 is arranged on the internal side of the door and is
movable between a neutral position in which the latch is extended, an opening
position in which the latch is retracted and a second position in which the lock
bolt is extended. The neutral position (e.g. horizontal position) is shown in Figure
3. As shown in Figure 4, the second handle 9 is selectively movable from the
neutral position in a first direction (i.e. clockwise in Figure 4) to the opening
position to effect retraction of the latch 10, against the bias, into the casing so as
to not interfere with the door frame. Upon release of the second handle 9, the
bias of the spring returns the second handle 9 from the opening position to the
neutral position.
With reference to Figure 7 to 9, the second handle 9 is movable from
the neutral position in a second direction to the second position (Figure 9) to
extend and retain the lock bolt 11 in the locked position to secure the door. The
second handle 11 is configured to require selective manual operation to return it
to the neutral position (as opposed to being biased to return to the neutral
position). It will therefore be appreciated by those skilled in the art that securing
of the door can be achieved by extending the lock bolt with the second handle
without the aid of a key, thus advantageously providing a secure latching mode
(or “night latching mode”) to the mortise lock 1, whereby a user can securely lock
the door from inside without requiring use of a key. The mechanism for achieving
this mode of operation is described in detail below.
In particular, it will be appreciated that by retaining the second handle 9
in the second position the lock bolt will be held in its thrown or extended position
so that the door can be secured, from the inside without the use of a key, whilst
still requiring a key to unlock the door from the external side of the door (e.g. from
outside the room or building to which the door is mounted). Figure 9 shows the
use of a key to unlock the door from the external side (e.g. outside) when the
mortise lock 1 is in its night latching mode.
It will also be appreciated that when the second handle 9 is in the
second position it provides a clear visual indication to a user that the lock bolt 11
is in its extended locking position, but that a key is not required to exit the room.
In the night latching mode, the second handle 9 can be used to open
the door by moving it from the second position to the neutral position to thereby
retract the lock bolt 11. Further rotation of the handle to move the second handle
from the neutral position to the first position retracts the latch 10, thereby
releasing the door and allowing the user to swing the door open on its hinges so
that passage may be made from the room through the doorway.
It will therefore be appreciated by those skilled in the art that the
mortise lock 1 is configured such that the lock bolt 11 advantageously provides
for secure locking of the door whereby the door will remain securely locked even
if the first handle 8 is operated from the outside to release the latch 10 (i.e. the
lock bolt will remain extended during operation of the first handle). Whereas, the
latch 10 provides a means to hold the door in a closed and latched position but
be readily opened from either side of the door by using the first or second handle
to retract the latch from its extended latching position (i.e. when the lock bolt is
retracted). That is, a key is still required to unlock the door from the outside when
the lock bolt 11 is in its extended position, regardless of whether the lock bolt 11
was extended by moving the second handle 9 to the second position or by key
operation of the lock cylinder 7.
Referring to Figures 1, 10 and 11, the mechanism for achieving the
various locking modes of the mortise lock 1 will now be described. The mortise
lock 1 includes a drive mechanism which interconnects and defines the working
interrelationship between the lock bolt 11, the key-operated lock cylinder 7, the
first side handle 8 and the second side handle 9.
The drive mechanism includes a split-pin arrangement/mechanism for
enabling selective independent operation of the first and second side handles to
retract the latch and/or extend the lock bolt. The split-pin arrangement comprises
a first spigot (not shown) extending from the first handle 8 and a second spigot
(not shown) extending from the second handle 9. The first and second handles
are arranged so that the first and second spigots are coaxially aligned and define
an axis of rotation for the first and second handles.
The drive mechanism includes a cam mechanism mounted to the first
and second spigots. The first and second spigots act in combination with the
cam mechanism and to enable selective independent operation of the key-
operated lock cylinder 7 and the second side handle 9 to extend or retract the
lock bolt 11.
Referring to Figure 1, the cam mechanism includes three axially
aligned cam-type elements including an inside arm 21, a middle arm 22, and an
outside arm 23.
The outside arm 23 is mounted to the first spigot of the first handle 8
(e.g. external handle) and engages the head 18 of the shaft 16 such that
operation of the first handle 8 causes a corresponding rotation of the outside arm
23 to retract the latch 10.
The inside arm 21 and middle arm 22 are mounted to the second spigot
of the second handle 9 (e.g. internal handle). The middle arm 22 engages the
head 18 of the shaft 16 such that operation (e.g. rotation) of the second handle 9
in a first direction to its opening position causes a corresponding rotation of the
middle arm 22 to retract the latch 10. Rotation of the second handle 9 in a
second direction to its second position causes a corresponding rotation of the
inside arm 21 to extend the lock bolt 11 to its locking position. A friction reducing
element in the form of a washer 24 is provided between the inside arm 21 and
middle arm 22 to reduce the friction between these two components during
relative rotation thereof.
In the illustrated embodiment, the lock body 1 includes an auxiliary
securing mechanism in the form of throw bolts 25. The illustrated embodiment
includes two throw bolts 25 which are adapted to slide in opposite directions to
each other. An upper throw bolt 25 is employed to provide additional securing of
the door at a point above the top edge of the door. A lower throw bolt 25 is
employed to provide additional securing of the door at a point below the door (i.e.
in the floor).
The throw bolts 25 are configured to move between extended and
retracted positions in unison and simultaneously with the extension and retraction
of the lock bolt 11. More particularly, the throw bolts 25 are adapted to be
operated by either the key-operated lock cylinder 7 or the second handle 9 (e.g.
internal handle).
To actuate the throw bolts 25, the auxiliary securing mechanism
includes a top actuating arm 26 and a bottom actuating arm 27 operatively
associated with the lock bolt 11 and the inside arm 21 of the cam mechanism.
The top and bottom actuating arms (26, 27) are mounted for sliding movement
relative to the casing 2 between extended and retracted positions. The bottom
actuating arm 27 has an engaging formation in the form of a notch “N’ which the
inside arm 21 engages such that rotation of the inside arm 21 causes a
corresponding sliding movement of the bottom actuating arm to extend or retract
the associated throw bolt 25.
The top actuating arm 26 has an angled slot 28 for receiving an
external side pin 29 extending from the lock bolt 11. The external side pin 29 is
also received in a (e.g. horizontal) slot 30 in the top backing plate 4. The slot 28
is angled at approximately 45 degrees relative to the horizontal slot 30 such that
movement of the lock bolt 11 causes the top actuating arm 26 to be linearly
displaced in a direction substantially normal to the direction of movement of the
lock bolt 11 (in this case, upwardly to effect securing of the top throw bolt 25 into
the door frame above the door).
The bottom actuating arm 27 also has an angled slot 31 for receiving
an internal side pin 32 extending from the opposite side of the lock bolt 11. The
internal side pin 32 is also received in a (e.g. horizontal) slot 33 of the rear
backing plate 3. The bottom arm slot 31 is angled at approximately 45 degrees
relative to the horizontal slot 33 such that movement of the lock bolt 11 causes
the bottom actuating arm 27 to be linearly displaced in a direction substantially
normal to the direction of movement of the lock bolt. As clearly shown in Figure
1, the bottom arm slot 31 is angled in an opposite direction to the angle slot 28 in
the top actuating arm 26 so that the bottom arm and thus lower throw bolt moves
downwardly to engage a point in the floor, whilst the top throw bolts moves
upwardly.
A bearing 34 is preferably mounted on each side pin (29, 32) to
facilitate the relative sliding movement between the backing plates and the
respective actuating arms (26, 27). A retainer in the form of a clip ring 35 is fitted
to the pins to retainer the bearing in position.
Accordingly, the present invention, at least in its preferred
embodiments, provides a safe, robust, effective, easy to use and relatively
inexpensive device for enhancing the security of residential, commercial and
industrial buildings. Preferred embodiments of the multi-point lock body
advantageously enable safe and secure locking of a hinged door or window by a
user from an internal side without the use of a key whilst at the same time
providing a clear indication to the user of the mode in which the door or window
has been locked. In particular, a user need only observe the position of the
inside handle to receive an immediate indication of the locking mode used.
These features are of particular advantage during the event of time critical
emergencies such as fires, particularly if the key is not readily available or seen
by the user. In these and other respects, the invention in its preferred
embodiments represents a practical and commercially significant improvement
over the prior art.
Although the invention has been described with reference to specific
examples it will be appreciated by those skilled in the art that the invention may
be embodied in many other forms.
Claims (31)
1. A lock body for a hinged door, the lock body including: a casing; a first handle arranged on a first side of the casing; a second handle arranged on an opposed second side of the casing; a locking mechanism mounted to the casing; a latch slidably mounted to the casing and biased to an extended latching position, the latch being retractable against the bias by operation of either one of the first side handle and the second side handle to an unlatched position; a lock bolt slidably mounted to the casing for movement between an extended locking position and a retracted unlocked position, the lock bolt being operably associated with the locking mechanism and the second side handle; wherein the second side handle is configured to be movable between a neutral position where the latch is extended, an opening position where the latch is retracted, and a second position where the lock bolt is extended; and wherein, when the lock bolt has been extended to the locked position by the second side handle the lock bolt can be retracted by either the locking mechanism or the second side handle, and when the lock bolt has been extended by the locking mechanism the lock bolt can only be retracted by the locking mechanism.
2. A lock body according to claim 1, wherein the locking mechanism includes a key-operated lock cylinder extending through the casing from the first side to the second side of the door.
3. A lock body according to claim 2, wherein the key-operated lock cylinder has a rotatable member for effecting movement of the lock bolt between the locking and unlocked positions via key operation of the cylinder.
4. A lock body according to claim 3, wherein the rotatable member directly engages the lock bolt such that its rotation causes a linear displacement of the lock bolt.
5. A lock body according to any one of the preceding claims, wherein the first handle is biased to a neutral position in which the latch is in its extended latching position.
6. A lock body according to claim 5, wherein the first handle is biased to the neutral position by a first handle spring.
7. A lock body according to any one of the preceding claims, wherein the second handle is biased to return from the opening position to the neutral position.
8. A lock body according to any one of the preceding claims, wherein the second handle is configured to require selective manual operation to return it to the neutral position from the second position.
9. A lock body according to any one of the preceding claims, wherein the latch is biased to its extended latching position by a latch spring.
10. A lock body according to claim 9, wherein the latch spring is mounted over a shaft extending from a rear face of the latch.
11. A lock body according to claim 10, wherein the latch, latch spring and shaft are mounted to a mounting bracket within the casing.
12. A lock body according to claim 11, wherein a spring spacer is provided between a head of the shaft and the mounting bracket to preload the latch spring.
13. A lock body according to any one of the preceding claims, wherein the casing houses a drive mechanism interconnecting and defining the working interrelationship between the lock bolt, the locking mechanism, the first side handle and the second side handle.
14. A lock body according to claim 13, wherein the drive mechanism includes a split-pin arrangement for enabling selective independent operation of the first and second side handles to retract the latch and/or extend the lock bolt.
15. A lock body according to claim 14, wherein the split-pin arrangement comprises a first spigot extending from the first handle and a second spigot extending from the second handle.
16. A lock body according to claim 14 or claim 15, wherein the drive mechanism includes a cam mechanism associated with the split-pin arrangement for enabling selective independent operation of the locking mechanism and the second side handle to extend or retract the lock bolt.
17. A lock body according to claim 16, wherein the cam mechanism includes two or more rotatably mounted camming elements.
18. A lock body according to any one of the preceding claims, in which the cam mechanism includes three axially aligned camming elements, including an inside arm, a middle arm and an outside arm, wherein the outside arm is mounted to the first spigot of the first handle such that operation of the first handle causes a corresponding rotation of the outside arm to retract the latch, and wherein the inside arm and middle arm are mounted to the second spigot of the second handle such that operation of the second handle in a first direction to its opening position causes a corresponding rotation of the middle arm to retract the latch, and operation of the second handle in a second direction to its second position causes a corresponding rotation of the inside arm to extend the lock bolt to its locking position.
19. A lock body according to any one of the preceding claims, wherein the lock body includes an auxiliary securing mechanism for securing the door at one or more additional locations around the door.
20. A lock body according to claim 19, wherein the auxiliary securing mechanism includes one or more auxiliary securing elements, the auxiliary securing elements being receivable within openings arranged about a door frame and/or floor.
21. A lock body according to claim 20, wherein the auxiliary securing elements are selected from the group including securing pins, studs, bolts, anchors and throw bolts.
22. A lock body according to claim 20 or claim 21, wherein the auxiliary securing mechanism includes a top actuating arm and a bottom actuating arm operatively associated with the lock bolt and mounted for sliding movement relative to the casing between extended and retracted positions.
23. A lock body according to claim 22, wherein the top and bottom actuating arms are configured to slide in unison.
24. A lock body according to claim 22 or claim 23, wherein the inside arm of the cam-mechanism engages an engaging formation in the bottom actuating arm such that rotation of the inside arm causes a corresponding sliding movement of the bottom arm and the associated auxiliary securing element.
25. A lock body according to any one of claims 22 to 24, wherein each actuating arm has a mounting formation for mounting one or more extension arms such that an auxiliary securing element can be attached to the distal end of each extension arm.
26. A lock body according to claim 25, wherein each extension arm is threadedly engagable with the associated mounting formation.
27. A lock body according to any one of claims 22 to 25, wherein the auxiliary securing elements are configured to move between extended and retracted positions simultaneously with the extension and retraction of the lock bolt.
28. A lock body according to any one of claims 22 to 27, in which the top actuating arm has a top arm slot for receiving an external side pin connected to the lock bolt, wherein the external side pin is also received in a slot of a rear backing plate of the casing, the top arm slot being angled relative to the rear backing plate slot such that movement of the lock bolt causes the top actuating arm to be linearly displaced in a direction substantially normal to the direction of movement of the lock bolt.
29. A lock body according to any one of claims 22 to 28, wherein the bottom actuating arm has a bottom arm slot for receiving an internal side pin connected to the lock bolt, wherein the internal side pin is also received in a slot of a top backing plate of the casing, the bottom arm slot being angled relative to the top backing plate slot such that movement of the lock bolt causes the bottom actuating arm to be linearly displaced in a direction substantially normal to the direction of movement of the lock bolt.
30. A lock body according to any one of the preceding claims, wherein the casing is adapted for mounting within a recess formed in the free edge of the door.
31. A lock body for a hinged door substantially as herein described with reference to any one of the embodiments of the invention illustrated in the accompanying drawings and/or examples.
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
AU2011901215 | 2011-04-01 | ||
AU2011901215A AU2011901215A0 (en) | 2011-04-01 | Lock body |
Publications (2)
Publication Number | Publication Date |
---|---|
NZ599121A NZ599121A (en) | 2013-10-25 |
NZ599121B true NZ599121B (en) | 2014-01-28 |
Family
ID=
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