U.S. patent number 3,904,229 [Application Number 05/473,059] was granted by the patent office on 1975-09-09 for sliding door lock.
This patent grant is currently assigned to Ideal Security Hardware Corporation. Invention is credited to Russell W. Waldo.
United States Patent |
3,904,229 |
Waldo |
September 9, 1975 |
Sliding door lock
Abstract
A lock for sliding doors and including a strike adapted to be
mounted on a door frame and having opposite sides for reception of
a pair of latch hooks mounted for linear movements toward and away
from each other in supporting means adapted for mounting in a
sliding door. A motion transfer member imparts movement to one of
the latch hooks in either direction of its movement responsive to
movement of the other latch hook in the opposite direction. An
actuator is mounted on a slide element associated with one of the
latch hooks for imparting latching and unlatching movements to the
hooks, and cooperates with a supporting member to releasably lock
the latch hooks against unlatching movement, when it is desired to
lock the door in a closed position. A key operated lock is provided
for latching and unlatching the door from the side opposite the
actuator.
Inventors: |
Waldo; Russell W. (St. Paul,
MN) |
Assignee: |
Ideal Security Hardware
Corporation (St. Paul, MN)
|
Family
ID: |
23878023 |
Appl.
No.: |
05/473,059 |
Filed: |
May 23, 1974 |
Current U.S.
Class: |
292/29; 70/97;
292/103; 292/108 |
Current CPC
Class: |
E05B
65/087 (20130101); Y10T 292/0831 (20150401); Y10T
70/5181 (20150401); Y10T 292/0953 (20150401); Y10T
292/0959 (20150401) |
Current International
Class: |
E05B
65/08 (20060101); E05C 009/04 (); E05C
013/02 () |
Field of
Search: |
;70/70,79,80,97,103,118,106,120
;292/27,29,31,37,40,42,46,103,108,147,153,154 |
References Cited
[Referenced By]
U.S. Patent Documents
Foreign Patent Documents
|
|
|
|
|
|
|
64,967 |
|
Oct 1946 |
|
DK |
|
367,519 |
|
Oct 1906 |
|
FR |
|
810,117 |
|
Aug 1951 |
|
DT |
|
Primary Examiner: Craig, Jr.; Albert G.
Attorney, Agent or Firm: Merchant, Gould, Smith &
Edell
Claims
What is claimed is:
1. A door lock for a sliding door mounted in a frame for movements
toward and away from a closed position in operative engagement with
a cooperating frame member, said latch comprising:
a. a pair of elongated support members adapted to be mounted in
opposed parallel relationship in an opening extending transversely
through a door adjacent an edge of the door, one of said support
members including longitudinally aligned pairs of laterally spaced
guide flanges;
b. a pair of opposed latch hooks;
c. a pair of slide elements each connected to a different one of
said latch hooks and each longitudinally slidable between a
different pair of said guide flanges, said slide elements having
overlapping inner end portions and aligned longitudinally extending
slots through said overlapping portions;
d. a transverse shaft on said one of the support members extending
through said slots;
e. slide element mounting means including a lever journaled
intermediate its ends on said shaft for holding said slide elements
between their respective guide flanges;
f. connections between said lever and said slide elements for
imparting longitudinal movement to one of said slide elements in
one direction responsive to longitudinal movement of the other
slide element in the opposite direction;
g. a strike adapted to be mounted on a door frame, said strike
having opposite sides, each including a surface portion disposed
for hooking engagement with a different one of said latch hooks,
when the door is closed and said latch hooks are moved toward their
respective portions of said strike;
h. and an actuator including a shaft, said one of the support
members defining a longitudinal slot therethrough, said actuator
shaft extending through said longitudinal slot and being journaled
in one of said slide elements for limited rotation relative to said
one of the slide elements and for sliding movements therewith
longitudinally of the support members.
2. The door lock defined in claim 1, in which said one of the
support members defines a seat adjacent said longitudinal slot
therein, said actuator shaft having a lug portion movable into
engagement with said seat responsive to rotary movement of said
actuator shaft to one limit of rotary movement thereof to
positively lock said latch hooks in latching engagement with said
strike.
3. The door lock defined in claim 1, in which said slide element
mounting means includes a spring on said transverse shaft between
said lever and said slide elements and yieldingly urging said slide
elements into sliding engagement with said one of the support
members; characterized by a detent on said one of the support
members and cooperating notches on one of said slide elements for
releasably holding said slide elements in spaced portions of said
longitudinal sliding movement thereof.
Description
BACKGROUND OF THE INVENTION
This invention relates particularly to door latches and locks for
sliding doors which are supported by rollers or the like adjacent
either upper or lower edges of the door and guided in tracks or
rails at the opposite ones of the upper and lower edges. These
locks are usually mounted on a door adjacent a vertical edge of the
door for cooperation with a strike mounted in a vertical portion or
stile of a door frame.
It has been found, in sliding door latches or locks using a single
latch hook, that sometimes a locked sliding door may be raised or
tilted sufficiently in its track to cause disengagement between the
latch hook and strike, whereby access may be gained to the interior
of a room or building. With other locks of similar type, a key
operated lock may be sometimes picked or opened by a key from the
exterior, and access thus gained.
SUMMARY OF THE INVENTION
An important object of this invention is the provision of a sliding
door lock which cannot be unlatched by raising or tilting of the
door.
Another object of this invention is the provision of a sliding door
lock having a latch actuator on one side and a key-equipped latch
operating mechanism on the opposite side, the actuator being
operable to render the key-equipped mechanism inoperative to open
the door.
Yet another object of this invention is the provision of a door
lock as set forth which is relatively simple and inexpensive to
produce, and which is efficient in operation and durable in
use.
To the above ends, I provide a lock including supporting structure
for mounting in a door, a strike adapted to be mounted in a door
frame, a pair of opposing latch hooks having slide elements whereby
the latch hooks are mounted in the supporting structure for linear
movements toward and away from each other, each of the latch hooks
being disposed to having hooking engagement with a different one of
spaced or opposite portions of the strike. A key operated locking
device is utilzed to latch and unlatch the door lock from one side,
such as the outside of a door, and an actuator is used for the same
purpose from the opposite, or inside, of the door. The actuator is
disposed to be manipulated to lock the door from the inside of the
room or building in a manner to prevent the door from being opened
from the outside, even with the key normally used.
DESCRIPTION OF THE DRAWINGS
FIG. 1 is a fragmentary view in perspective of a conventional
sliding door and door frame with the door lock of this invention
applied thereto;
FIG. 2 is a fragmentary view partly in elevation and partly in
section, taken generally on the line 2--2 of FIG. 1;
FIG. 3 is an enlarged vertical section taken on the line 3--3 of
FIG. 2;
FIG. 4 is a fragmentary section taken substantially on the line
4--4 of FIG. 3, showing the door in a slightly open position;
FIG. 5 is a view corresponding to FIG. 4 but showing the door
closed and latched;
FIG. 6 is a further enlarged detail in section taken on the line
6--6 of FIG. 3;
FIG. 7 is an enlarged fragmentary view in elevation, as seen from
the line 7--7 of FIG. 3;
FIG. 8 is an enlarged fragmentary detail, partly in elevation and
partly in vertical section, taken generally on the line 8--8 of
FIG. 3;
FIG. 9 is a further enlarged transverse section taken on the
irregular line 9--9 of FIG. 8; and
FIG. 10 is a further enlarged fragmentary section taken on the line
10--10 of FIG. 8.
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT
In the drawings, a conventional vertically disposed sliding door is
indicated at 1, the same being assumed to be movable toward and
away from a vertically disposed door frame member or stile 2 which
defines a vertically extending door edge receiving groove or
channel 3. The door 1 is provided with a vertically elongated
opening 4 extending transversely therethrough and a branch opening
5 extending from the opening 4 to the adjacent edge or end 6 of the
door 1. The branch opening 5 is partially closed by a metallic
plate 7 that is secured to the end 6 by screws 8, the plate 7 being
provided with a generally rectangular central opening 9.
A strike 10 comprises an elongated base portion 11 and a laterally
outwardly projecting body portion 12 which defines opposite or
upper and lower recesses 13 each having a wall surface 14 adjacent
the outer end of the body 12. As shown, the strike 10 is disposed
within the channel 3 of the stile 2, the base 11 being provided
with vertically elongated slots 15 for reception of mounting screws
16 that are screw threaded into the stile 2 to mount the body
portion 12 in alignment with the opening 9 in the end plate 7 and
the branch opening 5.
In FIGS. 1-3, the inner surface of the door 1 is indicated at 17,
the outer surface thereof being indicated by the reference numeral
18. A pair of elongated inner and outer support members 19 and 20
respectively are disposed in opposed relationship in the transverse
opening 4 adjacent respective inner and outer sides 17 and 18 of
the door 1, and are locked in place by a pair of anchoring screws
21, see FIGS. 1 and 3-5. Adjacent the upper ends, the support
members 19 and 20 are formed to provide vertically elongated
recesses 22 for reception of one's fingers to aid in imparting
opening or closing movements to the door 1. As shown in FIG. 3, the
support member 20 is provided with screw threaded bosses 23 for
reception of the screws 21, and a transverse tubular boss 24 for
reception of a conventional cylinder lock 25, the purpose of which
will hereinafter become apparent. Although not shown, it may be
assumed that the cylinder lock 25 is provided with a suitable key
for operating the same.
The inner support member 19 is formed to provide inner bearing
surfaces 26 and 27, and laterally spaced pairs of guide flanges 28
and 29. A pair of opposed upper and lower latch hooks 30 and 31
respectively, are provided with respective plate-like slide
elements 32 and 33. As shown, the slide elements 32 and 33 are
rigidly secured to their respective latch hooks 30 and 31 by
machine screws 34 and dowels 35. The latch hooks 30 and 31 extend
into the branch opening 5, the slide element 32 having sliding
engagement with the bearing surface 26 and contained within the
guide flanges 28. In like manner, the slide element 33 has sliding
engagement with the bearing surfaces 27, and is contained between
the guide flanges 29.
The slide elements 32 and 33 have overlapping inner ends that
define respective overlapping longitudinally extending slots 36 and
37, and respective notches 38 and 39, each of which opens
transversely outwardly of an opposite side edge of its respective
slide element 32 and 33. A lever 40 provides a motion transfer
element for imparting sliding movement to one of the latch hooks 30
and 31 in one direction responsive to movement of the other latch
hook 30 or 31 and its respective slide element in the opposite
direction. The lever 40 extends generally transversely of the
direction of movement of the latch hooks 30 and 31, and is
pivotally mounted intermediate its ends on the extended end of a
boss or shaft 41 integrally formed with the inner support member
19. The boss or shaft 41 projects through the slots 36 and 37 in
the slide members 32 and 33, and a pair of washers 42 and 43 are
mounted on the shaft 41 intermediate the lever 40 and adjacent
inner end portions of the slide elements 32 and 33 to yieldingly
hold the slide elements against their respective bearing surfaces
26 and 27. With reference to FIGS. 3, 9 and 10, it will be seen
that the washer 42 is a spring washer. Preferably, the extended end
of the shaft or boss 41 is upset or peened over the intermediate
portion of the lever 40, as indicated at 44, to hold the lever 40
on the end portion of the shaft 41. At its opposite ends, the lever
40 is provided with transverse pins 45, each of which is received
in a different one of the notches 38 and 39 in the slide elements
32 and 33 respectively.
As shown in FIGS. 4 and 5, the latch hooks 30 and 31 are moved
between a relatively widely spaced apart unlatched relationship and
a relatively closely spaced apart latching relationship wherein the
latch hooks 30 and 31 are adapted to each engage a different one of
the strike surfaces 14. Means for releasably holding the latch
hooks in either of their unlatched or latching positions comprises
a detent member 46 integrally formed with the inner support member
19 and a pair of longitudinally spaced notches 47 in the slide
element 33, see particularly FIG. 10.
The latch hooks 30 and 31 are adapted to be moved from the outside
of the door 1 by means of a key, not shown, operating the lock 25,
and from the inside of the door 1 by an actuator 48 mounted in the
inner support member 19. The cylinder lock 25 includes a rotary
shaft 49 on which is mounted a crank 50 that carries a crankpin 51
that is received in a notch 52 in the slide element 33. The notch
52 is generally V-shaped to permit limited independent linear
movement of the slide element 33 between latch-opened and
latch-closed positions, when the crank 50 is in an unlocked
position of the lock 25. When the crank 50 is pivotally moved to
its locked position of the lock 25, the crank pin 51 moves the
latch hooks 30 and 31 to their latching position of FIG. 5. Thus,
latching and unlatching of the door 1 may be done from the exterior
thereof, only with the use of a key.
The actuator 48 comprises an inner shaft portion 52 that is
journaled in an opening 53 in the slide element 33, the shaft
portion 52 having a radially outwardly projecting lug 54 that moves
circumferentially within a segmental notch 55 opening into the
opening 53, see particularly FIG. 5, to limit rotary movement of
the actuator 48. The actuator 48 includes a diametrically enlarged
shaft portion 56 at one side of the slide element 33, the shaft
portion 56 defining an annular shoulder that cooperates with a
washer 57 mounted on the shaft portion 52 at the opposite side of
the slide element 33, to hold the actuator 48 against axial
movement relative to the slide element 33, see particularly FIG. 3.
The shaft portion 56 extends through a slot 58 in the inner support
member 19, the slot 58 extending longitudinally of the support
member 19 to permit movement of the actuator 48 in the direction of
latching and unlatching movement of the latch hooks 30 and 31 and
their respective slide elements 32 and 33. Outwardly of the support
member 19, the shaft portion 56 is provided with an enlarged head
59 and a handle portion 60, whereby the actuator 48 may be moved to
latch or unlatch the hooks 30 and 31, or rotated on its own axis
from the interior side of the door 1.
Adjacent the slot 58, the support member 19 defines a pair of
arcuate surfaces 61 which provide a seat for engagement with a
portion of the actuator 48, said portion being defined by a pair of
lugs 62 integrally formed with the shaft portion 56 of the actuator
48, see particularly FIGS. 3 and 6. When the actuator 48 is rotated
to one limit of its rotary movement, wherein the lug 54 engages one
end of the segmental recess 55, the lugs 62 are positioned as
indicated by full lines in FIG. 6, so that the actuator 48 and
slide member 33 are free to move longitudinally in a latching or
unlatching direction. Rotation of the actuator 48 to its opposite
limit of rotary movement, when the latch hooks 30 and 31 are in
their latching positions of FIG. 5, disposes the lugs 62 in seating
engagement with the arcuate surfaces 61 to positively hold the
actuator 48 and slide element 33 against movement in an unlatching
direction. It will be noted that, when the actuator 48 is thus
rotated to its locked position, the latch hooks 30 and 31 cannot be
disengaged from the strike surfaces 14 from the outside of the door
1, even with the use of a proper key.
When the latch hooks 30 and 31 are disposed in latching engagement
with the strike 10, as shown in FIG. 5, it is impossible to unlatch
the door 1 by moving the same vertically either upwardly or
downwardly. Further, when the door 1 is closed and latched, a key
is required to unlatch the door from the exterior; and, as above
described, if the actuator is rotated to a locked condition with
the lugs 62 in seating engagement with the arcuate surfaces 61, the
door cannot be unlatched from the exterior even with a key.
While I have shown and described a commercial embodiment of my
sliding door lock, it will be understood that the same is capable
of modification without departure from the spirit and scope of the
invention, as defined in the claims.
* * * * *