Window and Sash Balance

Windows having sliding sash comprise a frame having a top, bottom and side members, two of which have parallel grooves therein in which the opposite side edges of the sash slide. In the case of vertically hung or slidable sash, the grooves are in the side members of the frame, which side members are called jambs. The frames are mounted in building openings which are bounded by rough structural members to which the frames are fastened. In the case of wood frame buildings, for example, the building openings are bounded by 2.times.4's, and the frames are fastened thereto by nailing the jambs to the 2.times.4's. Most building openings are inaccurately made and the sides thereof are not exactly parallel. In addition, the side members, particularly when 2.times.4's, may have a bow therein, so that the jambs of the frames nailed thereto are pulled out of parallel. When the sash receiving grooves are not parallel, the sash have sideplay when they are opened, with the result that they rattle when subjected to vibration. Vertically slidable sash are made to stay in any opened position in which they are placed, by structures called sash balances. Sash balances in some instances are merely a pair of weights, each of which are connected to the sash by a cord which extends from the weight over a pulley in the top of the jamb and then down to an anchor in the sash. In other instances, sash balances have comprised a spring inside a vertically extending housing that is fixed to the side of the jamb, and which has an extensible member that is fixed to the sash.

An object of the present invention is the provision of a new and improved vertically hung sash that is rattle free even when the jambs between which it is installed are considerably bowed or out of parallel.

Another object of the invention is the provision of a rattle free vertically hung sash of the above mentioned type in which the sash has sufficient clearance with respect to one of the jambs in which it is received so that it can be moved sideways a sufficient distance to bring the opposite edge of the sash out of its sash receiving groove to thereby permit the sash to be removed from the window frame, and in which the sash is normally and automatically held centered in a manner accommodating a large amount of nonparallelism of the jambs.

A further object of the invention is the provision of a new and improved structure of the above described type in which the centering, and the jamb clearance accomodating function is performed by structure that is part of the balance structure.

Further objects and advantages of the invention will become apparent to those skilled in the art to which the invention relates from the following description of several preferred embodiments that are described with reference to the accompanying drawings forming a part of the present disclosure.

FIG. 1 is a fragmentary side elevational view of a vertically hung sash type window having a frame made of extruded aluminum sections, and showing a bottom sash which is slidably received in the jambs for vertical movement, and which embodies principles of the present invention -- the view showing the side jamb sectioned through its sash receiving groove to better illustrate the sash balance structure.

FIG. 2 is a somewhat schematic sectional view taken approximately on the line 2--2 of FIG. 1.

FIG. 3 is a fragmentary sectional view taken approximately on the line 3--3 of FIG. 1.

FIG. 4 is a side elevational view of the sash balance structure shown in FIGS. 1 and 3.

FIG. 5 is a rear view of the sash balance shown in FIG. 4.

FIG. 6 is a rear elevational view of the combination spring and balance housing retaining clip shown in FIGS. 4 and 5, and which embodies principles of the present invention.

FIG. 7 is a side view of the clip shown in FIG. 6.

FIG. 8 is a front view of the clip shown in FIGS. 6 and 7.

FIG. 9 is an isometric view of the clip shown in FIGS. 6 through 8.

FIG. 10 is an isometric view of a ramp shown in FIGS. 4 and 5 for retaining the extensible member of the balance in a partially extending position.

FIG. 11 is an isometric view of the combination sash hook and slide structure shown in FIGS. 4 and 5, and which is affixed to the extensible member of the sash balance.

FIG. 12 is a rear view of the slide shown in FIG. 11.

FIG. 13 is a rear view of the slide shown in FIGS. 4, 5, 11 and 12.

FIG. 14 is a side view of the combination sash hook and slide structure shown in FIG. 11.

FIG. 15 is a side view similar to FIG. 4, but showing another embodiment of the invention.

FIG. 16 is a rear view similar to FIG. 5, but showing the embodiment of FIG. 15.

FIG. 17 is an isometric view of the sash hook and slide structure shown in FIGS. 15 and 16.

FIG. 18 is a rear view of the slide structure shown in FIG. 17.

FIG. 19 is a front view of the slide structure shown in FIGS. 17 and 18.

FIG. 20 is a side view of the sash hook and slide structure shown in FIGS. 15, 16 and 17.

The window shown in FIGS. 1 through 3 of the drawings is of all aluminum construction and is of the single hung type i.e., single slidable sash type. The frame 10 comprises a pair of jambs 12 which are identical and which are made of the extruded aluminum shape shown in FIG. 3. The frame further comprises a header 14, of the extruded aluminum shape, best seen in FIG. 2, and a sill 16 of the extruded aluminum shape best seen in FIG. 2. The jamb section is of generally channel shape having an outer facia flange 18, an inner facia flange 20, and an offset web 22 that is divided into inner and outer sections 22i and 22o, respectively, by a jamb channel divider 24. The inner web portion 22i forms the bottom of the inner sash channel 26, and the outer web section 22o forms the bottom of the outer screen channel 28.

The header section 14 is of generally Z-shape having: an outer facia flange 30, an inner facia flange 32, and a straight connection web 34. The section is also provided with a short upwardly extending inner lip 36, that is spaced inwardly of the face of the inner facia flange 32 by a distance corresponding to the thickness of the inner facia flange of the jamb.

The sill section is of generally channel shape and has: an outer facia flange 38, an inner facia flange 40, and a stepped web 42, the inner section of which is stepped vertically to provide a shoulder 44, the outer surface of which is overlapped by the sash. The sill section also includes a short upwardly extending inner lip 46 that is spaced inwardly of the inner facia flange 40 for the purpose of overlapping the inner facia flange of the jambs.

The upper ends of the jambs are cut at right angles to their length to provide a flat surface that abuts the bottom surface of the connecting web of the header. A saw cut is made across the inner web 22i of the jamb immediately behind the inner facia flange 20 to receive the inner facia flange 32 of the header 14. The header 14 is held down upon the jamb 12 by a pair of self-tapping screws 48 which are threaded into a longitudinally extending screw hole 50 that is generally centered in the jamb channel divider 24. The bottom end of each jamb section 12 is cut off to abut the upper surface of the web 42 of the sill section 16, with the inner facia flange 20 and inner web portion 22i of the jamb being notched out to receive the shoulder 44 of the sill 16. Each side of the sill is held to the jamb by a self-tapping screw 52 which is threaded into the lower end of the longitudinally extending hole 50 of the jamb.

The sash 54 shown in FIGS. 1 through 3 is also made from extruded aluminum sections the construction of which will not be given in detail, since an understanding thereof is not essential to an understanding of the present invention. The construction of the sash however can be made out from FIGS. 1 through 3 of the drawings. Suffice it to say that the stiles 56 of the sash extend downwardly of the bottom rail 58 of the sash, and that each stile 56 is notched out at the bottom as at 60 to receive a sash hook, as will later be explained. As best seen in FIG. 3 of the drawings, the stile 56 is of generally channel shape -- the outstanding legs of which are spaced from the bottom of the inner sash channel 26 by a distance that is less than half of the depth of the channel 26. By this expedient the sash 54 can be slid laterally until it bottoms in the sash receiving channel of one jamb, whereupon the opposite edge of the sash 54 is free and clear of the inner facia flange 20, and the sash can be removed inwardly of the frame. FIG. 3 of the drawings shows the sash 54 generally centered in the frame 10.

The sash 54 can be slid upwardly with its stiles 56 being guided in the inner sash channels 26 and while being centered therein by a sash balance structure 62 that embodies principles of the present invention, and that can best be seen in FIGS. 3 and 4 of the drawings. The sash balance structure 62 is of the block and tackle type, and has an elongated housing 64 of hat-shaped cross section. The sash balance structure 62 comprises an upper sheave 66 comprising opposite plates 68 that are connected together by top and bottom pins 70 and 72 that are riveted to the plates 68. The bottom pin 72 has a pulley 74 journaled thereon, and the top pin 70 receives the bottom hook of a coil spring 76, the top end of which is received in structure which will later be explained in detail. The upper sheave 66 is guided for vertical movement by the inner sidewalls of the housing 64. The sash balance 62 also includes a bottom stationary sheave 78 that comprises a pair of opposite plates 80 that are connected together by top and bottom pins 82 and 84, respectively. The bottom pin 84 journals a pulley 86 thereon, and the top pin 82 serves as an anchor for a cord 88 which extends upwardly around the pulley 74, which then loops around the pulley 86, which then loops around the pulley 74 again, and which then proceeds out of the bottom end of the housing 64 between the pulley 86 and the web 90 of the hat-shaped housing. The bottom end of the cord 88 provides an extensible member that is biased into the housing for purposes which will later be explained.

The upper end of the coil spring 76 is hooked into a novel spring anchor clip 92, which according to principles of the invention, also anchors the housing 64 on the jamb of the window frame. The spring anchor clip 92 is a stamping of a generally channel shape having a web 94, and opposite flanges 96. The bottom ends of the flanges 96 are bent inwardly against each other as at 98. The inwardly bent portions 98 have stamped openings 100 therein through which the upper end of the coil spring 76 extends, and by which the coil spring is anchored. The bottom end of the web 94 is bent outwardly and downwardly to provide an ear 102 that is adapted to project out of the back side of the housing member 64 for the purpose of hooking over the bottom edge of a hole 104 in the window jamb. The flanges 96 of the anchor are each provided with an outwardly and downwardly extending ear 106 for the purpose of hooking over the bottom edge of a pair of holes 108 in the side walls of the elongated housing 64. For conveniency, the bottom edges of the holes 108 are best deformed inwardly by a distance corresponding to the thickness of the material of the sidewalls of the housing, so that the outer surfaces of the ears 106 can be slid downwardly of the housing 64 without springing the sidewalls of the housing apart. The upper hook of the coil spring 76 is first positioned in the hole 100 of the clip before the clip is slid downwardly into the housing 64. This is done with the spring slightly extended so that the spring in its retracted position will hold the ears 106 of the clip caught on the upper edges of the holes 108 of the housing 64. In the anchored position of the clip 92, the ear 102 projects out of the housing by a distance that is at least equal to the thickness of the jamb material on which the sash balance is intended to be used.

The bottom end of the cord 88 is tied to a slide structure 110 that is adapted to slide along the bottom of the inner sash channel 26. The slide structure 110 is best made of a plastic, such as nylon. As best seen in FIGS. 11, 12 and 13 of the drawings, the slide structure 110 comprises a base 112 having a pair of spaced apart parallel ridges 114 which serve as runners for sliding along the bottom surface of the inner sash channel 26. The opposite side edges of the base 112 have longitudinally extending narrow ridges 116 for sliding along the side edges of the channel 26. The upper end of the base 112 is tapered at an acute angle of approximately 30.degree. with respect to the runners 114 to provide a tapered abutment surface 118 for purposes which will later be explained. The top surface of the base 112 is provided with a pair of parallel ears 120 each having a pair of vertically spaced openings 122 therein. The openings 122 of one ear are in line with those of the other ear and receive a pair of pins 124 which are pressed into the openings 122 and are firmly held therein. The upper end of the base 112 is provided with a stepped opening 126 therethrough for receiving the end of the extensible cord 88 with a knot in the cord being retained in the enlarged portion of the stepped opening 126 as seen in FIG. 4.

According to principles of the present invention, a laterally extensible sash hook 128 is affixed to, and is carried by the slide 110. The sash hook 128 shown in the drawings is a stamping that is bent into a narrow U-shape with its legs 130 being positioned vertically between the ears 120 of the slide 110. The legs 130 each contain a pair of slotted openings 132 with the openings of one leg being directly in line with the openings in the other leg, and with the pins 124 extending through the slotted openings 132. The slotted openings 132 are inclined at an angle of approximately 20.degree. with respect to the horizontal (perpendicular to runners 114) for reasons which will later be explained. The legs 130 have their upper-outer corners removed at an angle to provide camming surfaces 134 which are in line with each other and which form an angle of approximately 60.degree. with respect to the horizontal as previously defined. The outer lower ends of the camming surfaces 134 are intersected by a vertical sash receiving groove 136, the upper outer edge of which is beveled as at 138 to facilitate the entrance of the lower end of a projecting stile 56 of the sash, as best seen in FIG. 1.

The sash balance is assembled by wrapping the cord around the sheaves, by passing the extensible end of the cord through the opening 126, and by tieing a knot on the projecting end. The clip 92 is hooked on the upper end of the spring 76 and the unit is placed over the back end of the housing 64, with the clip 92 being positioned above the upper end of the housing. A downward pull on the assembly causes the clip 92 to pull down lengthwise into the housing, whereupon the ears 106 automatically slide into the holes 108 of the housing and become anchored on the lower edge of the openings 108. The bottom sheave 78 is likewise provided with a pair of ears, not shown, and the bottom end of the housing is provided with a pair of openings similar to the openings 108. The bottom sheave 78 is grasped and pulled downwardly to extend the spring 76 and bring the sheave 78 to a position beneath the lower end of the housing 64. Upon release of the bottom sheave 78 it slides upwardly into the bottom end of the housing until its pair of ears become anchored in the pair of holes in the flanges of the housing 64. The upper tapered abutment surface 118 of the slide 110 has a notch 140 therein that is slightly wider than the width of the housing 64; so that when force on the end of the extensible cord is released, the slide 110 will be pulled upwardly until the bottom end of the housing 64 is seated in the notch 140 and the slide 110 is in firm abutment with the bottom of the housing 64. By reason of the notch 140, the slide is retained laterally. Because the cord is positioned between the pulley and housing, the slide can not move outwardly; and because the projecting ends of the slide surface 118 engage the laterally extending legs 142 of the hat-shaped housing 64, the slide can not move backwardly off of the housing. During shipment, therefore, the slide 110 holds the balance structure in assembled relationship.

FIGS. 4 and 5 of the drawings show the sash balance structure mounted on the jamb of a window. The mounting operation is performed by providing a hole 104 in both jambs of the window, if suitable holes are not already present; and by installing the ramp structure 144, best seen in FIGS. 4 and 10, on each jamb, a slight distance below the area which will later be occupied by the bottom end of the housing 64. The ramp 144, shown in the drawings, is a stamping having a generally square upper end -- the width of which is just slightly less than the width of the sash receiving channel 26. The bottom end of the ramp 144 is provided with a narrow generally L-shaped, bent down leg 146 having a hole 148 in the foot of the leg. The leg 146 is bent at such an angle relative to the square upper end of the ramp, so that the square upper end forms an angle of approximately 30.degree. with the foot of the leg 146 which contains the hole 148. The ramp structure is positioned on the jamb of the window, the location of the hole 148 is marked on the jamb, and the jamb is drilled for the reception of a self-tapping screw, as shown for example at 150 in FIG. 4 of the drawings. When installed on the jamb, the square upper end of the ramp 144 forms the same angle with the jamb as does the abutment 118 of the slide. The leg 146 of the ramp has a width which is less than the width of the notch 140 of the slide.

The installation of a sash in its frame is greatly simplified using the sash balance assemblies of the present invention. Before the sash is ready to be placed in the window it must be provided with plastic projections or guides 152 on its upper corners, if they have not already been provided by the sash manufacturer. This is done by simply drilling the sash stiles and fastening the plastic guides to the stiles with self-tapping screws. Assuming that the ramps 144 are in place, the sash balance structures are placed in position near the upper ends of the sash channels 26 with the ears 102 in the openings 104 of the jambs. Each assembly is thereafter pulled downwardly to hook the ears 102 on the bottom edges of the openings 104. Thereafter each slide 110 is pulled downwardly and is hooked beneath its ramp 144. The sash is positioned adjacent the header of the window with the plastic guides 152 above the top end of the balance housings 64. Thereafter one side edge of the sash is slid laterally into its sash receiving channel to bottom therein. When so bottomed the opposite side edge of the sash will be positioned inwardly of the opposing jamb, so that the sash can be pushed outwardly to bring both side edges of the sash in engagement with the jamb channel dividers. Upon releasing the weight of the sash, the tapered bottom edge of the plastic guides 152 will approximately center the sash with respect to the jambs. The sash is kept centered as the outer edges of the plastic guides slide down along the housing 64 of the sash balance structure. The slight weight of the sash hooks 128 causes the sash hooks to be in their most extended position relative to the slides 110, and the bottom lips 154 of the stiles 56 will move into engagement with the camming surfaces 134 of the sash hooks. Because the camming surfaces 134 are at a shallower angle relative to the lips 154 than are the side edges of the elongated openings 132 relative to the pins 124, the sash hooks will move inwardly and upwardly automatically over the ends of the lips 154 as the lips slide down the camming surfaces 134 and into the vertically sash receiving grooves 136. During this movement very little force is envolved, since the camming forces are only opposed by the weight of the sash hooks 128 themselves. When the lips 154 of the sash become seated in the bottom of the sash receiving grooves 136, further lateral movement is precluded. The hooks 128 can not cock on the lips 154 because of the outer lower abutment surfaces 156 and the inner upper abutment surfaces 158 of the sash receiving grooves 136.

The weight of the sash on the hooks 128 is transmitted thereafter through the pins 124 to the slides 110 to move the slides out of engagement with the ramps 144. An upward force on the slides 110 is provided at all times by the extensible cords 88 in an amount generally equal to the weight of the sash, so that the sash will stay in any vertical position in which the sash is placed. If a jamb of the window frame is not vertical, the force provided by the extensible cord 88 of that jamb balance structure will produce relative movement between its slide 110 and its sash hook 128 by reason of the inclined slotted openings 132 and pins 124. This relative movement pushes its slide outwardly relative to the sash to accomodate the lack of verticalism of the jamb. Because the weight of the sash acts in a true vertical plane, and because the extensible members of the sash balance structures work independently of each other, and of the sash, the opposing slides 110 move outwardly independently of each other to accomodate the irregularities of their respective jambs.

Once the slides come to rest, to support the sash in a particular position, the static friction between the slide 110 and the jamb on which it slides opposes any horizontal shifting of the pins 124 along the sides of the elongated openings 132, so that a considerable lateral force on the sash is necessary thereafter to produce any side movement of the sash. The static friction therefore of the slide on the jambs effectively prevents lateral sash movement and rattling of the window. When it is desired to remove the sash for cleaning, it is only necessary to raise the sash to its limit of travel adjacent the upper ends of the jambs, whereupon the slides 110 engage the bottom of the ramps 144. Thereafter the lips 154 of the sash, slide out of the sash receiving grooves 136 of the hooks 128, and a slight further movement thereafter brings the plastic guides 152 upwardly off of the upper ends of the housings 64. The sash can then be slide sideways into one of the sash receiving grooves of the jambs, and the opposite edge of the sash can then be pulled inwardly of the window frame.

The embodiment shown in FIGS. 15 through 20 is generally similar to the embodiment previously described, with the principal difference being that the extensible member of the sash balance structure is anchored to the jamb, and the housing of the sash balance structure is fixed to the sash. With this arrangement, the sash balance housing slides along the jamb of the window in which it is installed. Those portions of the embodiment shown in FIGS. 15 through 20 which correspond to similar portions of the embodiment shown in FIGS. 1 through 14 are designated by a like reference numeral characterized further in that a subscript "a" is affixed thereto. In the embodiment shown in FIGS. 15 through 20, no ramp 144 is used; and the slide structure 110a, instead of having an upper tapered abutment 118, is provided with an outwardly extending boss 160 having a snug fit in the bottom of the housing 64a. Appropriate holes are provided in the bottom of the housing 64a and the boss 160, and a rivet 162 is installed through the aligned openings, with the ends of the rivet being peened over to firmly retain the slide on the bottom end of the housing 64a. The upper end of the housing 64a is provided with a plastic cap 164 that is fixed to the housing 64a by a rivet 166. The end of the cord 88a is passed through the opening 168 of a hook structure 170 and is tied thereto.

The balance structure is installed on a jamb by merely hooking the hook 170 in an appropriate opening located in the jamb slightly below its midpoint and by pulling the housing 64a downwardly. A suitable stop 172 is positioned near the top of the jamb to limit upward movement of the housing 64a and when the cord 88a retracts, the housing moves upwardly into engagement with the stop. The sash guide 152a is then moved over the top of the housing 64a, and the sash is then lowered to bring the plastic guide 152a opposite the housing 64a. Further downward movement of the sash causes the lips 154a of the sash to slide downwardly into the sash hooks 128a in the same manner as previously explained for the embodiment shown in FIGS. 1 through 14. The operation of the embodiment shown in FIGS. 15 through 20 is generally the same as that described for the embodiment shown in FIGS. 1 through 14 excepting that the housing 64a moves in unison with the sash.

It will now be seen that the structure that has been provided fulfills the objects heretofore enumerated and that the desired results have been accomplished.

While the invention has been described in considerable detail, I do not wish to be limited to the particular embodiments shown and described; and it is my intention to cover hereby all novel adaptations, modifications, and arrangements thereof which come within the practice of those skilled in the art to which the invention relates, and which fall within the purview of the following claims.