Lock For Windows And Doors

Abstract

A device for securing a pair of slideable window or door sashes in a fixed frame having first and second locking plungers longitudinally displaceable in a housing mounted on a first of said sashes so that said plungers are respectively displaceable into and out of securing relation with said frame and the second of said sashes. The first locking plunger is provided with a keyhole-shaped slot therethrough, while the second locking plunger is positioned to extend through said slot and dimensioned for receipt within the wider portion of said slot but not in the narrow portion thereof at a first locked orientation at which the first locking plunger is retained in securing relation with the frame. Further, the second locking plunger is dimensioned for receipt within the narrower portion of the slot at an opened orientation of said plunger. Lock means is provided for releaseably securing the second locking plunger in said locked orientation.

Description

BACKGROUND OF THE INVENTION

This invention relates generally to window and door locks for use where said window or door is provided with at least two sashes moveable in a fixed frame. In the art, such locks generally permit the locking of the sashes in a single orientation, usually with both sashes in the closed position. Further, such locks have generally proved difficult to install and of complex manufacture to insure proper securing of the two sashes. Further, the operation of these locks has proved difficult, causing a safety hazard where the prompt opening of the window or door is required, as in the case of a fire.

By providing a novel lock construction incorporating a pair of interlocking plungers controlled by a single key lock, the foregoing deficiencies have been avoided.

SUMMARY OF THE INVENTION

Generally speaking, in accordance with the invention, a device for securing a window or door having at least first and second sashes slideable in a fixed frame is provided which includes a housing mountable on said first sash adjacent said frame and first and second locking plungers mounted in said housing for longitudinal displacement so that one end of each of said first and second locking plungers may move into and out of securing relation with one of said frame and second sash to prevent movement of said sashes relative to said frame and each other. The first locking plunger is formed with a slot therethrough having a first longitudinally extending portion of a first width and a second portion of a second width greater than said first width and positioned on the side of said first slot portion spaced from said first locking plunger end. The second locking plunger is positioned to extend through the slot and is dimensioned for receipt within said second slot portion but not in said first slot portion at a first locked orientation at which said first locking plunger is retained in securing relation with said frame or sash. Further, said second locking plunger is dimensioned for receipt within said first portion of said slot at an opened orientation thereof at which said first locking plunger is longitudinally displaceable. Lock means is provided for releasably securing the second locking plunger in said locked orientation.

The second locking plunger may be rotatably mounted in the housing for rotatable displacement between said locked and opened orientation. At least a portion of the region of said second locking plunger dimensioned for receipt within said slot may have a substantially flattened cross-section, the second locking plunger being rotatably displaceable between said opened orientation in which said region of flattened cross-section is aligned with said first slot portion for receipt therein, and said locked orientation at which said region of flattened cross-section is out of alignment with said first portion of said slot and received within said second slot portion.

The locking means may include cylinder means mounted for longitudinal displacement in said housing between open and locked positions, key-operated barrel means rotatably mounted in said cylinder means, tumbler means mounted in said cylinder and barrel means for the selective locking of said barrel means relative to said cylinder means, means for biasing said cylinder means in said open position, and means for releasably retaining the cylinder means in said locked position, the retaining means being operatively coupled to the barrel means for release in response to the rotation thereof. The second locking plunger is coupled to the locking means for longitudinal displacement therewith, and preferably coupled to the barrel means for rotational displacement therewith about the axis of its longitudinal displacement.

The second locking plunger may be formed with a first portion dimensioned for receipt only in the second slot portion and a second portion of a flattened cross-section dimensioned for receipt within the first slot portion. The second locking plunger would be rotatably and longitudinally displaceable in response to the operation of said locking means to position said second locking plunger first portion in said slot when second locking plunger is in said locked orientation and to position the second portion thereof in said slot when the second locking plunger is in said opened orientation.

At least one aperture may be formed in each of said second sash and frame in registration with the ends of said first and second locking plungers to effect securing of said sashes relative to said frame, and a plurality of further apertures may be formed in any one of said second sash and said frame in registration with the corresponding ends of said first or second locking plungers to permit securing of the relative position of said first and second sashes in said frame with said window or door opened to a predetermined extent.

Accordingly, it is an object of this invention to provide a locking device for doors and windows which may be selectively opened by a key-operated tumbler lock.

Another object of the invention is to provide a locking device for doors and windows which will secure at least two sashes relative to each other and to a fixed frame in one or more predetermined positions including positions wherein said window or door are open a predetermined amount.

A further object of the invention is to provide a locking device for doors and windows which is readily manufactured, installed and used.

Still other objects and advantages of the invention will in part be obvious and will in part be apparent from the specification and drawings.

The invention accordingly comprises the features of construction, combinations of elements, and arrangement of parts which will be exemplified in the constructions hereinafter set forth, and the scope of the invention will be indicated in the claims.

BRIEF DESCRIPTION OF THE DRAWINGS

For a fuller understanding of the invention, reference is had to the following description taken in connection with the accompanying drawings, in which:

FIG. 1 is a front elevational view of a window having the window lock construction according to the invention mounted thereon;

FIG. 2 is an exploded view of the window lock construction according to the invention;

FIG. 3 is an expanded sectional view taken along lines 3 -- 3 of FIG. 1;

FIG. 4 is a sectional view taken along lines 4 -- 4 of FIG. 3;

FIG. 5 is a sectional view corresponding to FIG. 4 but showing the lock construction according to the invention in the opened position;

FIG. 6 is an expanded sectional view taken along lines 6 -- 6 of FIG. 3;

FIG. 7 is an expanded sectional view taken along lines 7 -- 7 of FIG. 3; and

FIG. 8 is a sectional view corresponding to FIG. 7 but showing said lock construction in the opened position.

DESCRIPTION OF THE PREFERRED EMBODIMENTS

Referring now to FIG. 1, one embodiment 10 of the lock construction according to the invention is shown mounted for securing sashes 12 and 14 in fixed frame 16. The window and frame construction is conventional, with sashes 12 and 14 slideably mounted in frame 16, each sash being provided with at least one glass pane 18. As shown in FIG. 1, locking device 10 is secured to the top edge 20 of sash 12 adjacent a portion of frame 16. As more particularly shown in FIGS. 2 - 8, locking device 10 consists of a housing 22 secured to sash 12 by three screws 24. A first locking plunger 26 is slideably mounted in housing 22 so that end 28 thereof may move into or out of one of the holes 30 formed in frame 16. When received within one of holes 30, first locking plunger 26 retains sash 12 relative to frame 16 at a predetermined position depending on which particular one of the holes 30 receives end 28 of first locking plunger 26.

As best shown in FIGS. 2, 4 and 5, first locking plunger 26 is formed with a keyhole slot 32 having a first longitudinally extending portion 34 of a first width and a second circular portion 36 of a second width greater than said first width. First locking plunger 26 is also provided with a handle portion 38 for the manual displacement thereof. Housing 22 is provided with a bore 40 of rectangular cross-section through which first locking plunger 26 extends.

Extending normally to bore 40 in housing 22 is a second bore having a first portion 42 of a substantially circular cross-section positioned to intersect bore 40 and a second portion 44 communicating with bore portion 42 and of a substantially elliptical cross-section. A second locking plunger 46 is longitudinally displaceable within second bore 42, 44. Second locking plunger 46 is longitudinally displaceable in a manner to be described below so that end 48 thereof may move into and out of one of holes 50 formed in the front surface 51 of sash 14. A plurality of such holes 50 are provided so that the relative position of sashes 12 and 14 may be fixed with said window opened a predetermined amount.

Slot 32 formed in first locking plunger 26 is positioned for registration with bore portion 42 so that second locking plunger 46 may pass through said slot. End 48 of said second locking plunger is formed with a flattened, substantially rectangular cross-section of a width dimensioned to be received within slot portion 34 when aligned therewith. When second locking plunger 46 is so aligned, first locking plunger 26 may be manually displaced to selectively engage in one of holes 30. End 48 of second locking plunger 46 extends from a substantially cylindrical portion 52 of said second locking plunger which is dimensioned for receipt within the circular portion 36 of keyhole slot 32, but which cannot be received in longitudinally extending portion 34 of said slot.

Second locking plunger 46 is fixedly mounted on one end of barrel 54 of a locking mechanism 56, as more particularly shown in FIGS. 3, 7 and 8. Said locking mechanism also includes a cylinder 56 having a substantially elliptical cross-section dimensioned for receipt within bore portion 44. Said cylinder is formed with a cylindrical aperture 60 therethrough within which barrel 58 is positioned for rotatable displacement. As best shown in FIG. 6, barrel 54 is retained within cylinder 58 by means of a set screw 62 passing through an aperture 64 in the wall of cylinder 58 and riding in a circumferentially extending channel 66 in the outer surface of barrel 54. With this arrangement, barrel 54 may be removed from cylinder 58 by loosening set screw 62. Said set screw and channel arrangement also serves to limit the path of rotation of barrel 54 relative to cylinder 58. Cylinder 58 is slideably displaceable in bore portion 44. A longitudinally extending channel 68 is formed in the outer surface of said cylinder as best shown in FIGS. 2 and 6 and a pin 70 is mounted on the inner wall of bore portion 44 in registration with channel 68. Pin 70 cooperates with end 72 of channel 68 to limit the longitudinal displacement of cylinder 58 so as to prevent its removal from housing 22 in normal use. Housing 22 is preferably formed in two sections (not shown) to permit the assembly of locking mechanism 56 and second locking plunger 46 into the housing, said two sections being riveted, welded or otherwise firmly secured together after such assembly by means not shown.

A pair of springs 74 are mounted between the end 76 of bore portion 44 and the end 78 of cylinder 58 so as to normally bias said cylinder toward the position at which pin 70 engages the end 72 of channel 68. Cylinder 58 and barrel 54 are formed to accommodate a conventional lock tumbler assembly. Thus, a plurality of apertures 80 are formed in cylinder 58 while corresponding apertures 82 are formed in barrel 54. Received within said apertures are split pins 84 biased toward a keyhole opening 86 in said barrel by springs 88. Split pins 84 act in a conventional manner so that if the proper key is inserted in keyhole opening 54, the split in each pin will be aligned with the outer surface of barrel 54, thereby permitting the turning of said barrel. In the absence of the insertion of the appropriate key, one or more of split pins 84 will prevent the turning of said barrel. While the split pin type tumbler system is depicted in the drawings, the arrangement according to the invention is not limited to this tumbler system, and any other tumbler system for releasably securing a barrel to a cylinder may be utilized.

The end of barrel 54 adjacent second locking plunger 46 is formed with an aperture 90 therethrough adapted to receive a retaining pin 92 with an end thereof projecting from the surface of said barrel. A groove 94 is formed on the inner surface of bore portion 44 adjacent end 76 thereof. When cylinder 58 is displaced in bore portion 44 toward end 76 to a position at which the projecting end of pin 92 is in registration with groove 94, said pin will be received within said groove when barrel 54 is rotated, thereby retaining cylinder 58 in this position. Reference is had to FIGS. 4, 5, 7 and 8, in connection with which the operation of the locking device according to the invention will be explained. Said locking device is depicted in the locked position in FIGS. 4 and 7. When in the locked position, first locking plunger 26 is positioned with end 28 thereof in one of holes 30 in frame 16 while second locking plunger 46 is positioned with end 48 thereof in one of the holes 50 in sash 14. As shown in FIGS. 4 and 7, cylindrical portion 52 of said second locking plunger is received within circular portion 36 of slot 32, thereby serving to retain and lock first locking plunger 26 in position. The second locking plunger is locked in position since cylinder 58 is displaced into bore portion 44, barrel 54 is rotated so that pin 92 rides in groove 94 and apertures 80 and 82 of said cylinder and barrel respectively are in registration, so that locking mechanism 56 is locked. When so positioned, sashes 12 and 14 are fixed with respect to each other and with respect to frame 16.

To open the locking device according to the invention, as shown in FIGS. 5 and 8, a key, such as the key 100 fragmentarily shown in FIG. 8, is inserted in the keyhole 86 of barrel 54, thereby properly positioning split pins 84 of the tumbler mechanism, and barrel 54 is rotated about 90.degree.. When so rotated, pin 92 lifts out of groove 94 and, due to the action of springs 74, cylinder 58 is longitudinally displaced to the position shown in FIG. 8. At this position, end 48 is aligned with the longitudinally extending portion of slot 34 so that first locking plunger 26 may be manually displaced out of engagement with hole 30 and frame 16. Second locking plunger 46 is carried out of engagement with hole 50 in sash 14 by the displacement of cylinder 58 and barrel 54.

To relock the device, first locking plunger 26 would be manually displaced, cylinder 58 would be longitudinally displaced into bore portion 44 and key 100 would be rotated to position barrel 54 in the locked position.

Locking device 10 may also be arranged and mounted so that the first locking plunger engages the second sash and the second locking plunger engages the frame.

It will thus be seen that the objects set forth above, and those made apparent from the preceding description, are efficiently attained and, since certain changes may be made in the above constructions without departing from the spirit and scope of the invention, it is intended that all matter contained in the above description or shown in the accompanying drawings shall be interpreted as illustrative and not in a limiting sense.

It is also to be understood that the following claims are intended to cover all of the generic and specific features of the invention herein described, and all statements of the scope of the invention which, as a matter of language, might be said to fall therebetween.

Claims

What is claimed is:

1. A device for securing a window or door having at least first and second sashes slideable in a fixed frame, comprising a housing mountable on said first sash adjacent said frame; first and second locking plungers mounted in said housing for longitudinal displacement so that one end of each of said first and second locking plungers may move into and out of securing relation with one of said frame and second sash to prevent movement of said sashes relative to said frame and each other, said first locking plunger being formed with a slot therethrough having a first, longitudinally extending portion of a first width and a second portion of a second width greater than said first width and positioned on the side of said first portion spaced from said first locking plunger end, said second locking plunger being positioned to extend through said slot and being dimensioned for receipt within said second slot portion but not in said first slot portion at a first locked orientation at which said first locking plunger is retained in securing relation with said frame or sash, and dimensioned for receipt within said first portion of said slot at an opened orientation at which said first locking plunger is longitudinally displaceable; and lock means for releasably securing said second locking plunger in said locked orientation.

2. A securing device as recited in claim 1, wherein said second locking plunger is rotatably mounted in said housing for rotatable displacement between said locked and opened orientations.

3. A securing device as recited in claim 2, wherein at least a portion of the region of said second locking plunger dimensioned for receipt within said slot has a substantially flattened cross-section, said second locking plunger being rotatably displaceable between said opened orientation in which said region of flattened cross-section is aligned with the first slot portion for receipt therein, and said locked orientation at which said region of flattened cross-section is out of alignment with said first portion of said slot and received within second slot portion.

4. A securing device as recited in claim 1, wherein said locking means includes cylinder means mounted for longitudinal displacement in said housing between opened and locked positions; key-operated barrel means rotatably mounted in said cylinder means; tumbler means mounted in said cylinder means and said barrel means for the selective locking of said barrel means relative to said cylinder means; means for biasing said cylinder means in said open position; and means for releasably retaining said cylinder means in said locked position, said retaining means being operatively coupled to said barrel means for release in response to the rotation thereof, said second locking plunger being coupled to said locking means for longitudinally displacement with said cylinder means.

5. A securing device as recited in claim 4, wherein said second locking plunger is secured to said barrel means for rotatable displacement therewith about the axis of its longitudinal displacement.

6. A securing device as recited in claim 5, wherein said second locking plunger has a first portion dimensioned for receipt only in said second slot portion and a second portion of a flattened cross-section dimensioned for receipt within said first slot other portion when aligned therewith and said second slot portion, said second locking plunger being rotatably and longitudinally displaceable in response to the operation of said locking means to position said second locking plunger first portion in said slot when said second locking plunger is in said locked orientation, and to position the second portion thereof in said slot when said second locking plunger is in said opened orientation.