Note: Descriptions are shown in the official language in which they were submitted.
~3~i7~
--1--
LOCK FOR A SLIDING PATIO DOOR
This invention relates to locks of the type which
have a single operating mechanism to activate bolts at two
spaced locations and in particular the invention relates to
locks suitable for sliding patio doors.
An object of an aspect of the invention is to
provide a compact lock mechanism which enables a patio door,
or a window, for example, to be bolted simultaneously at two
different locations (such as the top and bottom of a patio
door) by a single movement of an operating handle. The lock
of this invention is of elongated construction so as to
occupy the minimum width so that it will fit into a very
narrow door or window frame.
An aspect of the invention is as follows:
A lock for a sliding patio door or window, the
lock being of nàrrow elongated form and comprising an
operating member in the form of a first pivoted tangent
plate, a first s ider plate connected to said first tangent
plate by a pin and slot mechanism, the slider plate being
adapted to be connected to a first bolt member, the tangent
plate being connected by a second pin and slot mechanism
to a second pivoted tangent plate, in such a manner that
clockwise rotational movement of the first tangent plate
causes anti-clockwise rotational movement of the second
tangent plate and vice-versa, the second tangent plate
also being connected by a pin and slot mechanism to a
second slider plate adapted to be connected to a second bolt
member, so that rotation of the operating member causes the
two slider plates to move in opposite directions so that
1~3~674
--2--
the bolt members provide simultaneous locking at both ends
of the lock, the lock including a deadlock mechanism compri-
sing a plate which has a locking projection adapted to be
moved into a position in which it inhibits movement of the
lock mechanism.
Preferably the two slider plates are arranged
parallel to each other and the pin employed to connect one
slider plate to its tangent plate passes through an aperture
in the other slider plate.
IO The locking projection or foot may be adapted to
block movement of one of the pins connected to one of the
tangent plates.
The deadlock locking plate may be moveable by
engagement of a rotary cam with a cam surface on the plate
such as to move the locking plate to cause said projection
or foot to inhibit movement of the lock mechanism.
Said rotary cam may be operable by a conventional
cylinder lock.
. ~ .
1136674
The bolting action of the lock and/or the deadlock
action may be operable from either side of the lock.
Preferably the lock includes a lock operating
handle and a fixed handle for sliding the door, the
operating handle being located at one end of the lock
and being small compared with the fixed handle which
occupies substantially the remaining length of the lock.
In the accompanying drwaings:-
FIGURE 1 illustrates diagrammatically part of a patio
door with a single-sided lock, embodying the
present invention, incorporated in the door;
FIGURE 2 is a section through the lock shown in
Figure 1;
FIGURE 3 is a section on the line A--A sho~n in
Figure 2;
-FIGURE 3a is a plan view of the locking plate;
FIGURE 3b shows a detail of the teo tangent plates;
and
FIGURE 4 is a section through the same lock modified
to provide a double-sided action.
.
In Figure 1 is shown, in chain dotted line, part
of a patio door 10 to which is fitted a lock 11 embodying
the present invention. To upper and lower door frame
- members 12, 13 respectively are fitted keep members 14,
15 adapted to be engaged by bolt members 16, 17 (in the
form of long rods) which are to be operated simultan-
eously by the lock 11, thus locking the patio door both
at its top and bottom.
The lock incorporates a small pivoted operating
handle 18 for bolting and unbolting the door and a larger
fixed handle 19 which occupies most of the remaining
1136674
--4-
axial length of the lock, for sliding the door bodily.
The lock has a rigid base plate 9 which can be fixed
in a recess in the door 10 by bolts (not shown).
The operating handle 18 is pivoted on plate 9 and
is fixed to a first tangent plate 20 (Figures 2 and 3
and 3b). Tnagent plate 20 is connected to a first
slider plate 21 by a first pin and slot mechanism
comprising a slot 22 in tangent plate 20 and a pin 23
fixed on the first slider plate 21. Pin 23 passes
through an elongated slot 23a in slider plate 28.
Slider plate 21 has a rod-like bolt member 16 fixed to
lt.
Tangent plate 20 is also connected to a second
tangent plate 24 (see Figures 3 and 3b) via a second pin
-and-slot mechanism comprising a slot 25 in tangent
plate 20 and a pin 26 fixed to tangent plate 24.
Tangent plate 24, pivoted at 27, is connected to a
second slider plate 28 via a pin and slot mechanism,
the slot 29 being formed in tangent plate 24 and the
pin 30 being fixed to a slider plate 28 which is in turn
attached to rod~like bolt member 17.
When handle 18 is turned anti-clockwise from its
position shown in Figures 1 and 2 the tangent plate 20
turns in the same direction, which is clockwise as seen
in Figure 3. This causes two things to happen.
Firstly slider plate 21 is moved upwardly releasing
bolt member 16 from its keeper. Secondly, and
simultaneously, tangent plate 24 turns anticlockwise
(as seen in Figure 3) which moves slider plate 28
downwardly thus releasing bolt member 17 from its
keeper 15.
1136674
--5--
A deadlock enables the lock mechanism to be
rendered inoperable at will.
A cylinder locl< 31 which is key-operated rotate~
a cam 32 to contact cam surface 32a on lower foot 33
of a slidable locking plate 4~. This will cause
locking plate 44 to slide downwardly (see Figure 3a
for two positions of locking plate) so as to bring the
upper foot 45 of the plate 44 into the path of pin 26
10 -(see Figure 2) thus preventing any further movement of
both tangent plates 20 and 24. This, in turn, prevents
any movement of handle 18. As shown in the drawings
the deadlock has not been operated so the main bolting
action of the lock can be used at will. The locking
plate 44 is resiliently held in either the deadlocked
ur unlocked position by a spring 46 which ensures full
travel in either direction of the locking plate. When
lock 31 is operated to unlock the door, the key is
turned away frum the leading edge of the door, i.e.
anti-clockwise as seen in Figure 1.
Figure 4 i3 similar to the arrangement shown in
Figures 1 to 3 e-xcept that the bolting action of the
lock and the deadlock can be operated from either side
of the lock. It will be seen that there are two
operating handles 18, two cylinder locks 31 and also
two fixed handles 19 to enable any operation to be
oarried out from-either side.
As can be seen from the drawings the pivoted
operating handle 18 is located adjacent one end of the
lock and is small compared with the larger fixed
handIe 19 for sliding the door bodily. It will be
noted that the handle 19 occupies virtually the remaining
length of the lock apart from the space occupied by the
1136674
operating handle.
It will also be noted that the lock is of elongated
construction and that the bolt member 16 is at the end
of the lock remote from its operating tangent plate 20,
and the bolt member 17 is at the end of the lock remote
from its operating tangent plate 24.
The lock can be used as either a right-hand or
left-hand operating lock by reversing the tangent plates
20, 24, slider plates 21 and 28 and locking plate 44.
