Demountable Sash Lock

Heretofore, many latching mechanisms have been provided for window sashes. However, a particular problem arises in the construction of the pivotable, take-out type of window where the upper part of the sash must be secured in the slide channels in a weathertight manner.

There has also been a problem in manufacturing where left and right hand latches had to be produced from a different mold, particularly in the case of slidable plastic latches.

The present invention provides a demountable latching mechanism for pivoted take-out windows wherein the latch bolt may be mass-produced and can be easily fitted into either the left or right hand side of the upper rail of the pivoted sash.

FIG. 1 shows the upper rail of a slidable pivoted window sash with a sash guiding lock mounted thereon, with parts broken away;

FIG. 2 is an exploded view, of the sash guiding lock and shows the slide latch with the two alternative openings into which an operating clip button may be fastened, which is located on the outside of the sash rail, and which enables the latch to be used in either the right or the left hand side for receiving the plastic finger button;

FIG. 3 is a sectional view taken along lines 3--3 of FIG. 1.

Referring to the drawings, it will be noted that in FIG. 1, there is shown a top rail 10 of a pivotable sash having an opening therein for inserting a finger button 11 which has flexible retaining clips 12 for insertion in rectangular opening 13 of slide latch 14 in a demountable condition. Openings 13 and 13' are provided so that either may be used depending upon whether the latch is mounted on the left or right side of the sash. Latch 14 has slide surfaces 16, 16' and 17, 17' for movement in and out of channel 18 of the top rail of the pivoted sash, and is preferably made of nylon.

In the operation position of the sash, the guiding lock with the slide latch is in a locked position and retained there by spring 19, held in place in channel 18 by clip 20 which is maintained in position when the finger button is pushed so as to move latch 14 and slide member 31 out of engagement with the side channels of window 21. Thus, there is provided a window having a frame which incorporates side jambs and a sash for disposition between said jambs, said sash having slide components with a lateral margin of a slide latch confronting said jambs, slide member 31 carried in the lateral margins of the sash being moveable therewith during travel of the latter relative to the jambs, a guide member 30 fixed on each jamb and the slide member 31, slidably engaging the confronting guide member 30. The slidable latching means 14, with slide member 31, are provided adjacent the upper sides of the top rail 10, while latching means 14, and slide member 31, are moveable between a first position wherein the upper portion of the sash is locked to the guide member 30, and a second position wherein the upper portion of the related slide member 31 is moved from engagement with said guide member 30. When the sash is moved back into the operating position, there is a camming surface which moves the slide member 31 into the second position, and automatically moves the slide member 31 into the second position past the channel guide member 30, and then the spring 19 moves the slide member 31 into the locked engagement of the first position for the normal operation of the sash. Means are also provided for pivotally engaging the ends of said slide members to the marginal portions of the guide member and when the latching means are in the second position, the sash may be swung with relation to the guide member on the side jamb, and conventional resilient counter-balancing or sash balancing mechanism 32 are operably connected with the jamb and with the sash for counter-balancing the sash.

It should be understood that changes and modifications in the formation, construction, and arrangement and combination of the several parts of the tilt-in window sash may be made and substituted for these herein shown and described, without departing from the nature and principle of the invention.