GB2261911A - Window lock - Google Patents

Abstract

A window lock having plural ramped 100, 110 keepers for a window sash and plural rollers 42, 112 movably associated with a slider 40 mountable on a window frame to provide multi-point locking. A roller and associated ramped keeper are bevelled (5a fig 4) to counteract any flexibility that might be encountered in a flexible window, such as a window made of vinyl. <IMAGE>

Description

Window Lock This invention relates to a window lock for a window having a window frame and a movable window sash.

Movable windows in general use have sash which are either sliding, double hung or pivotal, with the latter type including awning and casement windows. Many different forms of window locks are available for locking a movable window. The applicant markets window locks for such movable windows.

According to the present invention there is provided a window lock for a window having a window frame and a movable window sash, comprising a slider for mounting on one of the window frame and the window sash, the slider having a cam member, a ramped keeper for mounting on the other of the window frame and the window sash, and means for moving the slider when so mounted in a path extending lengthwise thereof to cause the cam member to coact with the ramped keeper when so mounted in establishing either a locked or unlocked condition of the window, each of the cam member and ramped keeper being bevelled to resist any separating movement in a direction normal to said path as a result of flexibility of the window frame and window sash as may result due to high loads.

A window lock constructed in accordance with the invention has particular utility for use with a vinyl window because it is able to compensate for the flexibility thereof.

In order that the invention may be well understood there will now be described an embodiment thereof, given by way of example, reference being made to the accompanying drawing, in which: Fig. 1 is a fragmentary, perspective view of a window shown in open position and which has a window lock embodying the invention and shown in Figs. 2-7 associated therewith; Fig. 2 is a side elevation of the same window lock hardware, shown without association with the window sash and window frame and with the window lock in unlocked position and being a view generally similar to that of Fig. 3 and with parts broken away; Fig. 3 is a view similar to Fig. 2 showing the window lock hardware in window-locking position and with the view being taken generally along the line 3-3 in Fig. 4;; Fig. 4 is a sectional view taken generally along the line 4-4 in Fig. 3 and showing the structure in association with the window frame and window sash; Fig. 5 is a view similar to Fig. 4 and taken generally along the line 5-5 in Fig. 3; Fig. 6 is a fragmentary diagrammatic view of a part of the structure as positioned as shown in Fig. 2 and illustrating a first toggle position; Fig. 7 is a view similar to Fig. 6 and illustrating a second toggle position for the structure in window lock position and as shown in Fig. 3; Fig. 8 is a fragmentary elevation of the housing of the same window lock; and Fig. 9 is an elevation view of the same window lock handle.

The window lock is shown in association with a window in Fig. 1 and with the only room-visible part thereof being a housing 10 and a handle 12.

The window has a window frame, indicated generally at 14, in which the window sash, generally indicated at 16, of a casement window is pivotally mounted. The mounting of such a window by hinges is well known in the art as well as use of a window operator, indicated generally at 18, for moving the window sash between closed and fully open positions or any desired position therebetween.

As will be readily recognized, the window lock can also be used for an awning-type window wherein the pivotal movement of the window sash would be generally about a horizontal axis, rather than the vertical axis of the casement window. The concepts embodied in the window lock could be utilized with other types of movable windows, such as a double hung window.

The window lock has particular utility with a vinyl window and an embodiment of a vinyl window is shown fragmentarily in Figs. 4 and 5. The window frame 14 has vertical wall sections 20 and 22 suitably integrally interconnected by interconnecting walls and with a pair of interconnected vertical walls 24 and 26 extending at right angles thereto and with the wall 26 defining a room-facing surface of the window frame.

The window sash 16 has a vertical exterior wall 28 with integrally associated walls including a wall 30 extending normal thereto which defines one of the walls mounting a vertical face panel 32 which can be brought closely adjacent to the vertical frame wall 24 when the window is closed and with a suitable weather strip 34 assuring a tight seal.

The window lock has a slider 40 movable in a path extending lengthwise thereof and which mounts a cam member, in the form of a roller 42. The slider 40 is movable in said path by its mounting on a planar part of a bracket 44 which mounts a pair of shouldered guide rivets 46 and 48 which extend through the respective slider slots 50 and 52, respectively, and which enable movement of the slider from the window unlocked position, shown in Fig. 2, to the window locked position, shown in Fig. 3.

The bracket 44 has a pair of bracket flanges 54 and 56 at right angles to the planar part thereof which can receive a pair of fasteners 58 and 60, respectively, which thread into a pair of alignment bosses 62 and 64 extending inwardly from the housing 10 and which fit into a slot formed in the walls 24 and 26 of the window frame. The inner face of the housing 10 extends beyond the perimeter of the opening in the window frame to abut against the interior room face of the vertical frame wall 26. The fasteners 58 and 60 can draw the bracket flanges 54 and 56 against the inner face of the frame wall 24 and the perimeter of the housing 10 against the wall 26 to capture the window frame therebetween.The perimeter part of the housing which bears against the wall 26 includes a continuous 0ring groove, parts of which are shown at 66 and 68 and which receive an O-ring to effect a light, water and airtight seal between the housing and the window frame.

The housing 10 rotatably mounts-the handle 12 for movement between two limit positions. One of these limit positions is the window locked position, as shown in Fig. 3, wherein the handle 12 extends downwardly and generally parallel to the frame wall 26. The handle can move to its other limit position, as seen in Fig. 2, which is the window unlocked position. This movement of 0 the handle is through an arc approaching 180 whereby the handle, as seen in Fig. 2, barely extends beyond the housing 10 and, thus, does not protrude into the room when the window is open.

The slider 40 and handle 12 have coacting means whereby rotation of the handle results in linear movement of the slider along the path lengthwise of the slider. This coacting means comprises a drive link 70 splined to the handle at its rotation axis and which has a pin 72 which coacts with a forked section of the slider. This forked section has a pair of tines 74 and 76 with an open-ended slot therebetween. With the window lock in locked condition and with the handle 12 in the position shown in Fig. 3, the handle can be rotated in a counterclockwise direction to the position shown in Fig. 2 and, during this rotation, the pin 72 will move sequentially inwardly and outwardly of the slot and in engagement with the tine 76 to move the slider 40 downwardly, as viewed in Figs. 2 and 3.In return of the handle 12 to the position of Fig. 3, the handle 12 is rotated clockwise and the pin 72 moves sequentially inwardly and outwardly of the slot and coacts with an edge of.the tine 74 to raise the slider, as viewed in Figs. 2 and 3. The planar part of the bracket 44 has an arcuate cut-out 80 to permit the free end of the drive link 70 to move between the positions shown in Figs. 2 and 3.

The ends of the tines 74 and 76 of the forked section of the slider are bevelled to enable movement of the drive link 70 to a toggle position in either of the limit positions of the handle. This is diagrammatically illustrated in Figs. 6 and 7. With the handle 12 moving to the window unlocked position of Fig. 2, the drive pin 72 moves in a counterclockwise direction, as viewed in Fig. 6, and the downward arc to a toggle position is permitted by the bevelled end 82 of the tine 76. The pin 72 has reached a toggle position wherein, if an upward force is exerted on the slider 40 as indicated by the upwardly-directed arrow, the bevelled end 82 of the tine 76 engages the pin 72 and tends to move the pin toward the right. This movement is prevented by coaction between the housing and the handle.

This coaction is achieved by structure shown in Figs. 8 and 9. Fig. 8 shows a side wall 83 of the housing 10 having an opening 84 to receive a stem 85 (Fig. 9) of the handle 12. A pair of abutments 86a and 86b are formed on the housing to define rotatable limit positions for the handle 12 by coaction with an arcuate rib 87 on the handle. The rib 87 has an included arc of approximately 1040, although not intended to be limiting, and the abutments 86a and 86b are spaced apart through an angular distance of approximately 2500 whereby the handle can rotate through an arc of approximately 1500.

A similar toggle position is achieved when the handle 12 is in window locked position. As seen in Fig.

7, any downward force applied on the slider 40, as represented by the downwardly-directed arrow, would cause a bevelled end 88 of the tine 74 to engage the drive pin 72 and urge the drive link 70 in a clockwise direction, as indicated by the arrow, which would be prevented by coaction of the handle 12 with the housing 10. The slider 40 cannot be moved by any outside force other than by handle movement.

The previously-mentioned cam member on the slider 40, which is the roller 42, coacts with a ramped keeper 100 which is mounted by suitable means to the vertical wall 30 of the window sash. The ramped keeper has an inclined ramp section 102 and a generally planar section 104. The ramped keeper 100 is shown in Fig. 2 in relation to the roller 42 when the window sash is not fully closed. With clockwise rotation of the handle 12 toward the locked position shown in Fig. 3, the slider 40 moves upwardly and the roller 42 engages the inclined ramp section 102 and rolls therealong to draw and maintain the window sash fully closed when the roller 42 moves onto the generally planar section 100 of the ramped keeper. The ramped keeper can be a solid member, as shown, or can be shaped from a metal plate.

In order to achieve multi-point locking, the window sash mounts a second ramped keeper 110 having the same construction as the ramped keeper 100 and at a distance therefrom. A second cam member, in the form of a roller 112, coacts with the ramped keeper 110. This roller 112 is rotatably-mounted on a tie bar 114 which is connected to an end of the slider 40 for lengthwise movement therewith. An upper end of the tie bar is movable within a tie bar guide 116 which is fastened to the frame wall 20 by fasteners 118.

Versatility in the location of points of locking is achieved by the manner in which a tie bar 114 may be associated with the slider 40.

The tie bar 114 has a slot 120 at the lower end thereof which extends lengthwise of the tie bar. A tie bar rivet is fixed to an offset upper end of the slider 40 and has a pair of aligned ears at a distance from the slider. With the tie bar 114 at an angle to the slider, the slot 120 can be aligned with the aligned ears of the tie bar rivet and the tie bar then moved past the ears and, thereafter, rotated to an alignment position, with the aligned ears then locking the tie bar 114 to the slider. There is also a tie bar rivet 124 at the lower end of the slider. The tie bar 114 can thus extend downwardly from the slider 40. Two tie bars can be used. Further variations can be achieved by the use of additional rollers with each tie bar (and additional ramped keepers) and the use of varying length tie bars.

The multi-point locking is achieved with delayed lock-up of the roller 112 and ramp keeper 110 relative to the roller 42 and ramped keeper 100 by the slider having a length of movement along its path greater than that required to move a roller along the inclined ramp section 102 and onto a generally planar section 104 of a ramped keeper and having the ramped keepers at a distance apart greater than the distance between the rollers. A generally planar section of a ramped keeper has a length greater than the difference in the distances to provide a dwell for one roller while the other roller is on an inclined ramp section.

An added feature with particular utility for a vinyl window because of the flexibility thereof is the bevelling of the rollers 42 and 112 and the generally planar sections 104 of the ramped keepers, as seen in Figs. 4 and 5, to resist separation therebetween in a direction normal to the path of the slider 40.

Referring more particularly to Fig. 4, any tendency of the window sash to move tbward the left, which would cause separation between the ramped keeper and the roller, is resisted by the bevelled relation therebetween.

The sequential locking action at the multiple lock points has a further advantage in limiting the maximum amount of force required at any one time to achieve the full locking of the window.

From the foregoing, it will be evident that a window lock with extreme versatility and providing for multi-point locking has been provided.

With the structure of the ramped keepers having the elongate generally planar sections providing an elongate dwell, there is an enhanced versatility in that the ramped keepers can be located in a desired relation to achieve the desired sequence of locking at various locking points. The tie bars can be provided in different lengths and with different numbers of rollers thereon and the desired tie bars can readily be associated with the slider at either the top or bottom thereof with the simple rotation connection which does not require the use of any attaching screws between the tie bar and the slider.

Claims (4)

1. A window lock for a window having a window frame and a movable window sash, comprising a slider for mounting on one of the window frame and the window sash, the slider having a cam member, a ramped keeper for mounting on the other of the window frame and the window sash, and means for moving the slider when so mounted in a path extending lengthwise thereof to cause the cam member to coact with the ramped keeper when so mounted in establishing. either a locked or unlocked condition of the window, each of the cam member and ramped keeper being bevelled to resist any separating movement in a direction normal to said path as a result of flexibility of the window frame and window sash as may result due to high loads.

2. A window lock as claimed in claim 1, wherein the cam member is a roller.

3. A window lock as claimed in claim 2, having a plurality of the ramped keepers, a tie bar connected to the slider for movement therewith along said path and a roller on the tie bar for coaction with a ramped keeper, the ramped keepers each having an inclined ramp section for window sash pull-in and a generally planar section which may extend in parallel relation with said path whereby one of the rollers may move along a keeper generally planar section of one of the ramped keepers while another roller is moving along an inclined ramp section of another of the ramped keepers, each of the inclined ramp section and generally planar section of a ramped keeper having said bevel, and the slider and tie bar having movement along said path substantially greater than that required to cause a roller to move along an inclined ramp section and on to a generally planar section of a ramped keeper.

4. A window lock as claimed in any of the preceding claims, wherein the slider and the slider moving means are mounted on the window frame, and the ramped keeper is mounted on the window sash.