[0001] The invention relates to a locking handle for a door or window, the locking handle
being of the kind comprising a fixing plate, a handle which is pivotally mounted on
the fixing plate for movement between open and closed positions, and a catch which
automatically engages when the handle is moved into the closed position to prevent
subsequent movement of the handle to an open position until the catch is released.
[0002] Locking handles of this general type are well known, and may be of the cockspur type
in which the handle has a nose arranged to engage with a striker or keep plate, or
of the espagnolette type in which the handle carries a drive spindle which is rotated
by turning the handle in order to operate an espagnolette locking mechanism.
[0003] According to the invention the catch of a locking handle of the kind described comprises
a push button which is pivotally mounted on the handle and is resiliently biased to
urge a first portion of the button into engagement with a first recess of the fixing
plate when the handle is in the closed position, said engagement preventing turning
of the handle, and the arrangement is such that depression of the push button releases
the catch by rocking the button against its resilient bias to move the first portion
of the button out of the first recess in a direction which is substantially at right
angles to the direction in which the button is depressed.
[0004] When the catch has been released, the handle can be turned to its open position so
that the door or window can be opened, and the push button can be released as soon
as the handle has been turned sufficiently for the button to be moved out of alignment
with the first recess of the fixing plate. When the door or window is closed and the
handle is turned to its closed position, the button comes into engagement with a portion
of the fixing plate and is caused by a camming action to rock against the resilient
bias so as to allow the handle to be moved to the closed position, whereupon the button
is realigned with the first recess and is caused by the resilient bias to move into
the first recess to lock the handle in the closed position.
[0005] Preferably the push button is arranged to be depressed in a direction which is substantially
parallel to the pivot axis of the handle, and the push button is resiliently biased
by means of a suitable spring, such as a torsion spring or a compression spring, acting
between the button and a portion of the handle.
[0006] Preferably the push button is pivotally mounted on the handle by means of a fixed
pivot pin carried by the handle and a channel shaped socket which is carried by the
push button and is a snap-fit onto the pivot pin so that the pin is received captively
by the socket and the socket can rotate about the pin. This arrangement facilitates
manufacture and assembly of the locking handle, especially if the push button comprises
a moulded plastics body and the socket is formed integrally with the body. In this
case manufacture and assembly of the locking handle may be further simplified if the
resilient bias acting on the push button is provided by a leaf spring which is formed
integrally with the body of the push button and bears against a portion of the handle.
[0007] If additional security is required, the push button may be provided with a key operated
locking plunger which is movable between a retracted position within the button and
a locking position in which it projects from the button, operation of the key to move
the plunger to its locking position when the first portion of the button is in engagement
with the first recess causing the plunger to engage in a second recess of the fixing
plate to prevent depression of the button to release the catch. Thus, operation of
the key to move the plunger to its locking position when the handle is closed and
the catch engaged acts to lock positively the handle in this position. The catch cannot
then be released to allow the handle to be turned to the open position until the key
has been used to retract the locking plunger from the second recess.
[0008] Two embodiments of a locking handle in accordance with the invention will now be
described, by way of example, with reference to the accompanying drawings, in which:-
Figure 1 is a cross-section through part of a first embodiment showing the handle
in the closed position and the catch engaged and locked;
Figure 2 is a view similar to that of Figure 1 but showing the catch unlocked and
released to allow the handle to be turned to the open position;
Figure 3 is a cross-section through part of the second embodiment showing the handle
in the closed position and the catch engaged and locked;
Figure 4 is a view similar to that of Figure 3, but showing the catch unlocked and
released to allow the handle to be turned to the open position;
Figure 5 is a section through the catch taken on the line V-V in Figure 3; and,
Figure 6 is a view similar to that of Figure 5 but showing the locking plunger of
the catch in its retracted position.
[0009] The locking handle shown in Figures 1 and 2 comprises a fixing plate 1 of elongate,
substantially rectangular shape, the plate having a substantially flat undersurface
2 and an upper surface provided with a raised central portion 3 between opposite end
portions 4 and 5 each of which has two recessed, countersunk screw holes 4a,4b and
5a,5b centred on the longitudinal axis of the fixing plate. The underside of the fixing
plate is provided with a recess 6 beneath the raised central portion 3, and the raised
portion 3 is provided with an aperture 7 communicating with the recess 6, the axis
of the aperture 7 being parallel to the axes of the recessed screw holes 4a,4b, 5a,5b
and perpendicular to the plane of the flat undersurface 2. At its end adjacent the
end 5 of the fixing plate 1, the central portion 3 has a pair of side walls 8 (only
one of which is shown) extending parallel to the longitudinal axis of the fixing plate
1 towards the end 5 on opposite sides of the screw hole recess 5b, the outer sides
of the walls 8 being flush with the sides of the fixing plate 1, and the inner sides
of the walls 8 defining, together with the end wall 9 of the portion 3, a recess 10
which is open at the top and its end remote from the central portion 3.
[0010] The locking handle also comprises a handle 11 which is pivotally mounted on the fixing
plate 1, the handle 11 having a body portion 12 provided with a boss 13 projecting
from the underside of the body portion and received rotatably in the aperture 7 of
the raised central portion 3 of the fixing plate so that the handle 11 can turn relative
to the fixing plate about a pivot axis coincident with the axis of the aperture 7.
A bearing sleeve 14 is provided between the boss 13 and part of the aperture 7, and
the free end 15 of the boss 13 is swaged radially outwardly over bearing washers 16
to prevent removal of the handle from the fixing plate, although any other suitable
retention method may be adopted if preferred. The boss 13 is provided with a bore
17 which is open at the free end 15 for receiving a conventional square sectioned
spindle (not shown) for driving an espagnolette mechanism, although as mentioned earlier
the handle may alternatively be of the cockspur type.
[0011] The handle 11 also has a hand grip portion 18 which extends from the upper end of
the body portion 12 in a direction substantially perpendicular to the pivot axis of
the handle and parallel to the plane of the undersurface 2 of the fixing plate. In
addition, the handle 11 has a locking catch 19 housed in a passage 20 of substantially
rectangular section provided in the body portion 12 between the boss 13 and the hand
grip portion 18, the passage 20 extending in a direction substantially parallel to
the pivot axis of the handle and being open at both the upper and lower surfaces of
the body portion 12.
[0012] The locking catch 19 comprises a moulded plastics push button 21 of substantially
rectangular section having a width slightly less than the width of the passage 20
so that the button 21 fits closely between the side walls of the passage 20. At its
upper end edge nearest the hand grip portion 18 of the handle, the push button 21
is formed with an integral mounting portion 22 defining a transversely oriented channel
shaped socket 23 which encloses a 270° arc and is a snap-fit over a fixed pivot pin
24 extending transversely between the side walls of the passage 20 near the upper
end of the passage adjacent the hand grip portion 18 so that the push button 21 is
pivotally mounted on the pivot pin 24 for rocking movement in the longitudinal plane
of the handle 11. A spring 25 is mounted to act between the push button 21 and the
hand grip end 26 of the passage 20 in order to bias the button to pivot about the
pin 24 in a direction towards the opposite end 27 of the passage 20, i.e. towards
the pivot axis of the handle. In this embodiment, the spring 25 comprises a torsion
spring which is mounted on the push button 21 so that opposite ends of the spring
act on the hand grip end 26 of the passage 20 and the facing end of the button 21
to press them apart. As mentioned earlier, however, the spring 25 may take any suitable
alternative form.
[0013] As shown in Figure 1, the upper end 28 of the push button 21 projects from the passage
20 at the upper surface of the handle, and the lower end 29 of the button projects
from the passage at the undersurface of the handle. When the handle 11 is in its closed
position shown in Figure 1, i.e. with the longitudinal axis of the handle 11 parallel
to the longitudinal axis of the fixing plate 1, a part 29a of the lower end of the
push button 21 is received in the recess 10 between the side walls 8 projecting from
the raised central portion 3 of the fixing plate, the button 21 being held in this
position with the end portion 29a engaging the end wall 9 of the recess 10 under the
action of the spring 25. In this position the catch 19 is engaged and prevents the
handle 11 from being turned to an open position.
[0014] It will be further noted that in this position of the handle 11 and the catch 19,
a longitudinal bore 30 extending through the push button 21 is substantially co-axially
aligned with the screw recess 5b which opens in the upper surface of the fixing plate
1 between the side walls 8 of the recess 10. Rotatably mounted within the bore 30
is a cylindrical locking plunger 31 having a part helical cam slot 32 provided in
its external surface, this slot receiving and cooperating with a lug 33 fixed to the
inner wall of the bore 30. At its upper end, the locking plunger 31 is provided with
a keyway 34 for receiving the lower end of an operating key 35 which is insertable
into the bore 30 through a slotted entrance guide 36 mounted in the upper end of the
bore 30. Following insertion of the key 35 into engagement with the locking plunger
31, rotation of the key in one direction will rotate the locking plunger 31 so that
interaction of the lug 33 and the slot 32 causes the locking plunger to move axially
from a retracted position within the bore 30 to a locking position in which the lower
end 37 of the plunger 31 projects from the lower end 29 of the push button 21 into
the recess 5b. This prevents the push button 21 from being rocked about its pivot
pin 24, and hence locks the catch 19 in engagement with the recess 10. Turning the
key 35 back in the opposite direction unlocks the catch by withdrawing the locking
plunger 31 from the recess 5b back to its retracted position within the bore 30.
[0015] With the locking plunger 31 retracted, the catch 19 can be disengaged from the recess
10 to allow the handle 11 to be turned to its open position. Disengagement of the
catch 19 is caused by depressing the upper end portion 28 of the push button 21 towards
the fixing plate 1, i.e. in a direction substantially parallel to the pivot axis of
the handle, thus causing the push button 21 to pivot about the pin 24 so that the
lower end 29 of the push button moves away from the raised central portion 3 of the
fixing plate to a position in which the portion 29a of the lower end of the button
has moved clear of the recess 10 as shown in Figure 2 . The handle 11 can then be
turned to the open position, and the push button 21 can be released to allow the spring
25 to return it to its rest position.
[0016] When the handle is moved back to the closed position, the lower end portion 29a of
the button 21 comes into engagement with the outer surface of the nearer side wall
8 of the recess 10, and the button 21 is thereby caused to rock about the pivot pin
24 against the action of the spring 25 as the handle moves further towards the closed
position, the wall 8 and the lower end portion of the button being shaped to facilitate
this camming action. In this way the push button 21 is gradually deflected to enable
it to move past the wall 8 as the handle is moved to the closed position, and when
the handle reaches the fully closed position the push button 21 becomes aligned with
the recess 10 and the bias exerted by the spring 25 acts to move the lower end 29
of the button into engagement with the recess 10 to hold the handle in the closed
position. If desired, the handle can then be locked in this position by inserting
and turning the key 35 to advance the locking plunger 31 into the recess 5b.
[0017] The embodiment illustrated in Figures 3 to 6 is identical to that just described
with reference to Figures 1 and 2 except with regard to the construction and arrangement
of the central bore 30' through the push button 21' and the locking plunger 31' which
is mounted within the bore 30'. In the second embodiment, the locking plunger 31'
comprises two parts, a first part 40 which receives the key (not shown) and is rotatable
but axially fixed relative to the button 21', and a second part 41 which is connected
to the first part 40 so that it is rotatable with the first part and is axially movable
relative thereto, the outer surface of the second part 41 having a part helical slot
32' which receives and cooperates with a lug 33' provided on the internal surface
of the bore 30'.
[0018] This arrangement enables the handle to be deadlocked in the closed position, the
first part 40 of the locking plunger 31' comprising a deadlocking cylinder which cannot
be rotated without insertion of the correct key. This part 40 has an annular peripheral
groove 42 which receives a lug 43 provided on the internal surface of the bore 30'
in order to prevent axial movement of the part 40 within the bore 30' while permitting
rotation thereof, and at its lower end the part 40 has an axially offset leg 44 projecting
in an axial direction, the leg 44 having a radially inwardly directed foot 45 at its
free end. The leg 44 and its foot 45 are received in an axially extending slot 46
in the second part 41, the part 41 having a shoulder 47 at the upper end of the slot
46 which is cooperable with the foot 45 to prevent the two parts from becoming axially
separated. The interengagement of the leg 44 and foot 45 in the slot 46 locks the
two parts 40 and 41 together rotationally, but allows the part 41 to move axially
relative to the part 40 between a retracted position as shown in Figures 4 and 6 and
a locking position in which it projects from the lower end of the push button 21'
as shown in Figures 3 and 5. Thus, insertion and rotation of the operating key in
the first part 40 will cause the lower part 41 to rotate with the first part 40 and
simultaneously to move axially relative thereto as a result of the interengagement
of the lug 33' and the part helical slot 32' in the outer surface of the part 41.
Rotation in one direction causes the part 41 to move from the retracted position to
the locking position in which, when the handle 11 is closed and the catch 19' engaged
as shown in Figure 3, the part 41 projects into the recess 5b in the fixing plate
1. Rotation in the opposite direction will move the part 41 back to its retracted
position to allow the catch 19' to be released and the handle to be opened.
[0019] In both embodiments described above, the lug 33,33' is mounted on the inside surface
of the bore 30,30' of the push button, and the part helical slot 32,32' with which
it cooperates is provided in the outer surface of the locking plunger 31,31'. It will
of course be appreciated, however, that the position of these parts may be reversed,
so that the slot is provided in the internal surface of the bore 30,31' and the lug
is provided on the outer surface of the locking plunger.
1. A locking handle for a door or window comprising a fixing plate (1), a handle (11)
which is pivotally mounted on the fixing plate for movement between open and closed
positions, and a catch (19) which automatically engages when the handle is moved into
the closed position to prevent subsequent movement of the handle to an open position
until the catch is released, characterised in that the catch (19) comprises a push
button (21) which is pivotally mounted on the handle (11) and is resiliently biassed
to urge a first portion (29a) of the button into engagement with a first recess (10)
of the fixing plate (1) when the handle is in the closed position, said engagement
preventing turning of the handle, and the arrangement is such that depression of the
push button (21) releases the catch (19) by rocking the button against its resilient
bias to move the first portion (29a) of the button out of the first recess (10) in
a direction which is substantially at right angles to the direction in which the button
is depressed.
2. A locking handle according to claim 1, in which the push button (21) is depressed
in a direction which is substantially parallel to the pivot axis of the handle (11).
3. A locking handle according to claim 1 or claim 2, in which the push button (21) is
pivotally mounted on the handle (11) by means of a fixed pivot pin (24) carried by
the handle and a channel-shaped socket (23) which is carried by the push button and
is a snap-fit onto the pivot pin so that the pin is received captively by the socket
and the socket can rotate about the pin.
4. A locking handle according to claim 3, in which the push button (21) comprises a moulded
plastics body and the socket (23) is formed integrally with the body.
5. A locking handle according to claim 4, in which the push button (21) is resiliently
biassed by means of a leaf spring which is formed integrally with the body and bears
against a portion (26) of the handle (11).
6. A locking handle according to any one of claims 1 to 4, in which the push button (21)
is resiliently biassed by means of a torsion spring (25) or a compression spring acting
between the button and a portion (26) of the handle.
7. A locking handle according to any one of the preceding claims, in which the push button
(21) is provided with a key operated locking plunger (31) which is movable between
a retracted position within the button and a locking position in which it projects
from the button, operation of the key (35) to move the plunger (31) to its locking
position when the first portion (29a) of the button is in engagement with the first
recess (10) causing the plunger to engage in a second recess (5b) of the fixing plate
(1) to prevent depression of the button to release the catch.
8. A locking handle according to claim 7, in which the locking plunger (31) is mounted
to rotate about its own axis in response to insertion and turning of the key (35),
rotation of the plunger causing it to move axially between its retracted and locking
positions as a result of engagement of a follower member (33) carried by the push
button (21) or the plunger (31) in a helical slot (32) provided in the plunger or
the push button respectively.
9. A locking handle according to claim 7, in which the locking plunger (31') is in two
parts, a first part (40) which receives the key and is rotatable but axially fixed
relative to the push button (21') when the key is turned, and a second part (41) which
is connected to the first part (40) so that it is rotatable with the first part and
is axially movable relative thereto, the second part (41) having the follower member
(33') or the helical slot (32').