Abstract:
A window assembly with a window movably mounted in a frame between closed and open positions has holes in the frame and the window which register with each other when the window is closed. A locking pin is slidably received in the registering holes to lock the window in its closed position.

Description:
SUMMARY OF THE INVENTION 
     This invention relates to an auxiliary lock for a window to prevent its being opened by a person from the outside. 
     On single family homes in particular, the windows are often vulnerable to entry by a burglar or other intruder because of inadequate locks. The present invention is directed to a novel, simple and practical solution to this problem in the form of an auxiliary lock which is readily applied to or released from a window from the inside of the building. In accordance with this invention a locking pin is slidably insertable at a location on the window which prevents it from being opened from the outside even if the principal lock for that window is disabled. 
     A principal object of this invention is to provide a novel auxiliary lock for a window to prevent it from being opened even if the principal window lock is disabled. 
     Further objects and advantages of this invention will be apparent from the following detailed description of a presently-preferred embodiment, which is illustrated in the accompanying drawings. 
    
    
     DESCRIPTION OF THE DRAWINGS 
     FIG. 1 is a front elevation of an awning window provided with the safety lock of the present invention; 
     FIG. 2 is an enlarged vertical cross-section taken along the line 2--2 in FIG. 1 at the side of the window where the crank is located; 
     FIG. 3 is a perspective view of the crank and the window-operating linkage at this side of the window; and 
     FIG. 4 is a horizontal cross-section taken along the line 4--4 in FIG. 1, with parts removed. 
    
    
     Before explaining the disclosed embodiment of the present invention in detail it is to be understood that the invention is not limited in its application to the details of the particular arrangement shown since the invention is capable of other embodiments. Also, the terminology used herein is for the purpose of description and not of limitation. 
     DETAILED DESCRIPTION 
     FIGS. 1-4 
     FIG. 1 shows an awning window having a rectangular frame with opposite vertical sides 10 and 11, a horizontal top 12 and a horizontal bottom 13 which together define a rectangular window opening. As shown, the frame also has a horizontal middle piece 14 extending between the opposite sides 10 and 11 midway between the bottom and top pieces 13 and 12. However, it is to be understood that this middle piece is not present in the window frame of some types of awning windows. As shown, the window has two window panels, an upper panel 15 for closing the rectangular opening bounded by the top and middle pieces 12 and 14 and the opposite sides 10 and 11, and a lower panel 16 for closing the rectangular opening bounded by the middle and lower pieces 14 and 13 and the opposite sides 10 and 11. 
     Both sides 10 and 11 are of hollow rectangular cross-section, as shown for the left side 10 in FIG. 3. A respective mechanical linkage is slidably disposed in each side and is coupled to both window panels 15 and 16 so that the window panels can be swung or rocked between vertical positions in which they close the respective openings in the window frame and inclined positions in which they extend at an acute angle to the vertical, with the upper end projecting beyond the frame on the outside of the building. 
     A hand-operated crank C (FIG. 1) is mounted on the lower left side of the window frame at the inside of the building. As shown in FIG. 3, this crank is in a housing 17 which is attached by screws to the inside wall 10a of the window frame&#39;s left side 10. A rotatable crank member 18 operates a rigid first linkage arm 19 (FIG. 2) through a gear-toothed drive arrangement (not shown) inside the housing 17. 
     The first linkage arm is pivotally coupled at 20 to a depending second linkage arm 21. The lower end of arm 21 is pivotally coupled at 22 to a longer third linkage arm 23. The pivotal connection between arms 21 and 23 is slightly more than half-way up linkage arm 23. The lower end of this third linkage arm is rigidly attached to a horizontal shaft 24 which is rotatably mounted in a cylindrical bushing 25 (FIG. 4). Both shaft 24 and bushing 25 extend through the hollow bottom piece 13 of the window frame from the left side 10 to the right side 11. 
     At the right side of the window frame the rotatable shaft 24 is rigidly attached to the lower end of a rigid linkage arm 23a (FIG. 4) which is identical to the third linkage arm 23 at the left side. At the right side there is no crank and there are no linkage arms corresponding to the first and second linkage arms 19 and 21 at the left side. The rotatable shaft 24 causes linkage arm 23a at the right side to move in unison with linkage arm 23 at the left side, both in response to operation of the hand crank. 
     Linkage arm 23 at the left side is pivotally coupled at 26, near its upper end and above its pivotal connection at 22, to linkage arm 21, to the lower end of a fourth linkage arm 27. Similarly, linkage arm 23a at the right side of the window is pivotally coupled at its upper end to the lower end of a linkage arm (not shown) which is identical to linkage arm 27 at the left side of the window. 
     The remaining parts of the window-operating linkage on each side of the window need not be described in detail because they are of known, conventional design. 
     To open the windows, the user turns the crank handle 18 in a direction for moving the linkage arm 23 counterclockwise in FIG. 2. This movement of linkage arm 23 at the left side of the window is imparted through shaft 24 to the corresponding linkage arm 23a at the right side, and the additional parts of the linkages on the left and right sides of the window move in response to this displacement of linkage arms 23 and 23a. 
     In accordance with the present invention, the linkage arm 23 near the manually operated crank C at the left side of the window can be locked in its window-closing position, shown in FIGS. 2 and 3, by a locking pin L, which has an elongated straight shank or stem 5 and a handle H of circular shape at one end. A horizontal hole 28 (FIG. 3) is drilled through the front wall 10a of the left side piece 10 of the fixed frame for the window a short distance laterally inward from (i.e. to the right of) the window crank housing 17. A similar hole 29 is drilled through linkage arm 23. The two holes 28 and 29 are aligned with one another. The respective axes of these holes extend at an acute angle, such as about 45 degrees, to the front wall 10a of the frame side piece 10, so that the shank of the locking pin L can be inserted first through the hole 28 in the frame and then through the opening 29 in linkage arm 23. The shank S of the locking pin has a snug, sliding fit in these holes. When inserted, as shown in FIGS. 2-4, the locking pin prevents the linkage arm 23 from moving so that the hand crank C cannot be operated. 
     As shown in FIG. 4, at the right side of the window an identical locking pin L may be inserted through aligned horizontal holes 28a and 29a in the front wall 11a of the right side 11 of the window frame and in the linkage arm 23a, respectively. The conjoint axes of holes 28a and 29a extend at an acute angle to the front wall 11a of the window frame side 11 which is equal and opposite to the angle of the conjoint axes of holes 28 and 29 in the window frame side piece 10 and the linkage arm 23 at the left side.