US3676956A

US3676956A - Readily removable window with weather-stripping

Info

Publication number: US3676956A
Application number: US155533A
Authority: US
Inventors: Henry A Taylor; Maurice E Sterner Jr
Original assignee: D J DINSMORE CO
Current assignee: JIM WALTER RESOURCES Inc A ALABAMA CORP; JW WINDOW COMPONENTS Inc A DE CORP; D J DINSMORE CO
Priority date: 1971-06-22
Filing date: 1971-06-22
Publication date: 1972-07-18
Anticipated expiration: 1989-07-18

Abstract

A removable window applicable to single or plural hung sash designs and particularly to metallic construction. The window includes a casing having jamb channels in which are positioned balance assemblies to be rigidly positioned therein with respect to translational or longitudinal movement. The sash rides on the surface of the balance assembly through guide members which are deformable and the opposite edges of the sash include lower guides which are positioned in the jamb channels remote from the balance assemblies to be guided therein. The sash cords of the balance assemblies have hooks which ride beneath the lower guide means on the sash which hook is turned with pivoting of the sash on the lower guides to lock the sash cords in position in the jamb channels as the window is removed. The sash are removed by pivoting the window away from the balance assemblies through the deformable guide means at the upper edge and tilting the sash to release the lower guides from the jamb channels. Weatherstripping on the window casing and on the sash seal the edges of the sash and the tops and bottoms of the same to provide an airtight window assembly.

Description

United States Taylor et a1.

[ July 18, 1972 [72] Inventors: Henry A. Taylor, York; Maurice E.

Sterner, Jr., Spring Grove, both of Pa.

[73] Assignee: D. J. Dlnsmore Co., Sioux Falls, S. Dak.

[22] Filed: June 22, 1971 [21] Appl. No.: 155,533

s21 u.s.c1 ..49/446,49/181,49/454 51 Int.Cl ..E05d13/12 5s FieldofSearch ..49/446,453,454,455,456,

[56] References Cited UNITED STATES PATENTS Mendelsohn ..49/454 Primary Examiner-Reinaldo P. Machado Assistant Examiner-Philip C. Kannan [5 7] ABSTRACT A removable window applicable to single or plural hung sash designs and particularly to metallic construction. The window includes a casing having jamb channels in which are positioned balance assemblies to be rigidly positioned therein with respect to translational or longitudinal movement. The sash rides on the surface of the balance assembly through guide members which are deformable and the opposite edges of the sash include lower guides which are positioned in the jamb channels remote from the balance assemblies to be guided therein. The sash cords of the balance assemblies have hooks which ride beneath the lower guide means on the sash which hook is turned with pivoting of the sash on the lower guides to lock the sash cords in position in the jamb channels as the window is removed. The sash are removed by pivoting the window away from the balance assemblies through the deformable guide means at the upper edge and tilting the sash to release the lower guides from the jamb channels. Weather-stripping on the window casing and on the sash seal the edges of the sash and the tops and bottoms of the same to provide an airtight window assembly.

18 Claims, 9 Drawing Figures PATENTED JUL 1 8 I972 SHEET 1 OF 3 FIG, 1,

PATENTED JUL 1 8 I972 SHEET 2 OF 3 I NVEN TOR. Henry A. 7' ay/or BY Maurice E. Sternegdz W/W jw/%z m u M w w MW 6 Z 2 A x m f) m 0 FIG. 3,

FIG. 5,

PATENIEuJmwmn 3.676956 SHEET 3 OF 3 FIG, 9.

INVENTOR. Henry A Taylor Maurice E. Sterne/ 1 READILY REMOVABLE WINDOW WITI-I WEATHER- STRIPPING This invention relates to removable windows, both pluralhung and single sash types having balance assemblies associated therewith and more particularly an improved window of this type in which the sash of the same is readily removable from the window casing and the sash and casing include weather-stripping to seal the window.

Single and double-hung windows having balance assemblies are well known and in use. Such windows have been made removable from a window casing. The prior patent of Dawson J. Dinsmore U.S. Pat. No. 3,358,404 dated Dec. 19, 1967 shows one version of such a window construction. This particular construction requires that the balance assemblies mount to and move with the windows and require special latches in the jamb channels to be operated to remove the sash therefrom. Generally, windows of this type require translational movement of the sash within the jamb channels and compressibility of the portion of the jamb channel to permit removal of the sash therefrom. This provides for sloppiness in fit between sash and jamb channel and leakage of air around the same. This type f construction does not readily permit the addition of weather-stripping thereto to seal the window. In addition, this particular type of construction is not applicable to metal windows.

The present invention in a removable window is applicable to single and double-hung windows and is particularly adapted to the use of metal window and sash construction. It provides a simplified and improved design of a window which of incorporates a balance assembly and in which both sash may be readily removable without translational movement of the same. Further, it provides an improved structure whereby the sash may be moved in any position in the window casing and further provides for a substantially rigid guiding mounting of the sash within the casing. It further provides an improved and simplified weather-stripping of the window sash in the window casing from the outside toward the inside sealing both sides of each sash surfaces for all positions of movement to effectively weather-strip the window. It further requires no special latches and permits a simplified and easy removal of the window.

Therefore it is the principal object of this invention to provide an improved removable window assembly with balances.

Another object of this invention is to provide an improved construction of this type particularly adapted for metal windows.

A further object of this invention is to provide a removable window assembly in which the sash may be moved in any position with respect to the window casing.

A still further object of this invention is to provide an improved window construction of this type incorporating weather-stripping.

A still further object of this invention is toprovide a readily removable window assembly incorporating balances which is simple in design, low in cost and easy to maintain.

These and other objects of this invention will become apparent from a reading of the attached description together with the drawings wherein:

FIG. 1 is a perspective view of a removable double-hung window embodying our invention,

FIG. 2 is a sectional view of the same taken along the lines 22 in FIG. 1 and with one sash removed and a second sash tilted outward for removal,

FIG. 3 is a sectional view of a portion of the casing of FIG. 2 taken along the lines 33 therein,

FIG. 4 is a rear view of a balance assembly of the improved removable window,

FIG. 5 is an elevation view of a sash with parts broken away to show the guide structures thereon,

FIG. 6 is a sectional view of the window casing and a portion of the sash with parts broken away taken along the lines 6-6 in FIG. 7,

FIG. 7 is a sectional view of a portion of the jamb as shown in FIG. 6 taken along the lines 7-7 therein,

FIG. 8 is an end elevation view of a sash showing the guide structures, and

FIG. 9 is an end elevation view of the catch for the balance assembly cord.

Our improved window with balance having a removable sash is shown in the drawings in connection with a doublehung window. The principles of the invention are equally applicable to single-hung windows and is preferably utilized in metal window construction. Thus in FIG. 1, the window casing is indicated generally at 10 as incorporating

side jambs

12 and 14 connected to a head frame 16 and a sill frame 20 to form the general rectangular casing construction. The side jambs, head and sill frames are preferably made of an extruded aluminum and the parts are held together through suitable screws, such as is indicated at 22, extending through apertures in the head and sill frames and into the side jambs, as will be hereinafter described.

. The side jamb construction will best be seen in the elevation view of FIG. 2 and the sectional view of FIG. 6. Each jamb member has an outer and inner jamb channel, indicated by the

numerals

24 and 25, and as will be noted from the cross-sectional configuration of FIG. 6 the outer or upper sash is of a shorter width dimension than the inner or lower sash in the double-hung window. The jamb construction or cross section is so formed as to define the

respective channels

24, 25 by

flanges

26, 27 and 28 extending transversely out from an irregular base plate portion 30. Flange 26 has a transversely extending guide portion 31 depending therefrom which defines one side of the channel 24 or recess. It further extends outwardly to include a channel shaped portion 32 which mounts the weather-stripping material which will bear against the outer sash. The same construction exists for flange portion 27. Thus, the

flange portions

26, 27 with the guide portions 31 extending transversely therefrom define the recess which extends the length of the jamb channel and in which is positioned the balance assembly, indicated generally at 35. The inner jamb channel is similarly formed between the

flange portions

27, 28 with guide flanges 31 extending transversely therefrom to define the opening or the recess forming the inner jamb channel 25 with the flange portion 27 having a weather-stripping portion 38 extending therefrom to bear against the inner sash. Positioned in the upper portion of each of the jamb channels are balance assemblies 35 which are identical in construction and are shown in detail in FIG. 4. It should be noted, however, that any particular balance construction may be employed which will fit within the recess and will have an outer projecting guide surface, such as is indicated at 40, for the purpose of guiding the sash thereon. The back side of the base plate includes extending rib portions 42 which are split and which receive the screws 22 holding the head and sill frame portions to the jamb members forming the sides of the casing. Each jamb member is identical in construction and when assembled with the head frame and sill frame define aligned recesses or channels on the sides of the casing to guide the respective sash therein. The sill frame is inclined toward the outside of the window, as will be seen in FIG. 2.

For the purpose of the present disclosure, the balance assembly which is employed and positioned in each of the jamb channels on either side of the sash is shown from the back in FIG. 4 to disclose one version of the same. It includes a generaliy U shaped or channel shaped metal structure 44 having the curved or guide surface 40 on the outer edge of the same and with a spring 45 connected at one extremity to a pin 46 positioned through the sides and secured thereto. The free end of the spring, as indicated at 47, mounts a pulley member 48 having a plurality of sheaths over which the sash cord 49 extends. At the opposite extent of the balance assembly is positioned a fixed sheath or pulley 50 which is rigidly mounted in the channel by means of a pin 52 extending between the sides of the same. The operation of the balance assembly is conventional with the sash cord extending over the plurality of sheaths of the

pulleys

48 and 50 causing the floating pulley 48 connected to the free end of the spring 49 to move as the sash cord is drawn out from the confines of the channel member 44 forming the frame for the balance assembly. A pin 53 positioned at the upper end of the balance assembly provides the means by which it is secured in the jamb channel. Thus, as will be seen in the sectional view of FIG. 3, a bent flange portion 55 in the jamb channel at the upper end of the same bears against the pin 53 to secure the same in the recess or jamb channel mounting the same in a particular position near the upper end of the jamb channel. The free extremity of the sash cord 49 carries a hook member 60 which has a generally V or triangular shaped notch therein and a transversely extending flange 62 formed integral therewith with an aperture therein to which the end of the sash cord is knotted. The opposite end of the hook member has a toothed portion 63, for the purpose of which will be later noted. As will be hereinafter identified, the hook members are adapted to ride below a lower guide on the sash to apply a spring bias to the same in a conventional manner.

The individual sash are also preferably of a metallic construction being made of extruded parts and held together in assembled relationship to form the four sides or sides, top and bottom of the individual sash. The particular details of this construction form no part of the present invention except to include provisions for forming of weather-stripping and guides as will be hereinafter noted. Thus, as will be seen in FIG. 1, the upper and outer sash 70 which is smaller in width dimension than the lower and inner sash 75 is formed basically of side parts 72 with top and

bottom frame parts

73, 74 respectively which are held together through any suitable means such as screws, as will be hereinafter identified. The side parts 72 are generally channel shaped on their outer edges as will be seen in FIGS. and 6. Each of the sash are generally of the same construction. On the inner facing surface of the channeled edges is a weather-stripping flange portion 80 which projects translationally from the channel edges and mounts the weather-stripping material. The latter bears against the transversely extending flange portions 31 of the jamb channel to seal the window at this surface. Positioned in the channel shaped edges of each of the sash are upper and lower guide members identified at 90 and 100, respectively. In the enlarged and broken away view of FIG. 5, the side shape of the upper guide member 90 is disclosed. The upper guide member 90, one of which is mounted on each side of each sash in the window, is a generally bifurcated member having a V shaped notch 92 therein with an inwardly projecting flange 93 at one edge of the same. It includes a flat plate like portion 94 attached to the other end of the bifurcated portion. The flange 93 fits into a slot in the top of the side 72 of the sash frame and on each side thereof with the upper guide member being secured thereto by a screw indicated at 96 threaded through an aperture 97 in the upper frame portion of the sash. The flat upper surface projects beyond the upper level of the sash and is notched as at 98 to fit into the ridge surface 40 of the balance assembly 35 and guides the sash thereon. The upper guide member is made of a plastic material and the portion of the same carrying the plate like surface or guide portion 94 is bendable or deflectable to permit the window to be rotated away from or over the projecting surface of the balance assembly upon removal. The lower guide member 100 is also a plastic part which is generally rectangular in base surface hav ing a projecting flange 102 at one edge thereof which fits through a slot in the lower frame part 74 of the sash and is secured thereto by a screw 103 threaded through an aperture in the lower end of frame 72 of the sash. This lower guide portion has a first generally triangular surface 105 projecting a short distance out from the main body portion of the guide and with a smaller triangular shaped surface or projection 106 extending therefrom throughout the remainder of the extent of the transversely extending portion. The

screws

96 and 103, in addition to holding the

guide members

90, 100 in place also connect the side parts 72 of the sash to the top 73 and bottom 74 parts of the sash to hold the same in assembled relationship. FIG. 8 shows the upper and lower guide members 90,

as mounted in the channel shaped edges of the sash as they appear on one edge of the same with the same construction being present on the opposite edge surface and for the upper and lower sash.

The frame parts when assembled include the suitable recessed surface 78 into which the glass pane 76 is positioned to be held therein through suitable rubber or vinyl mounting or glazing 77 or equivalent structure. These upper and lower guide parts are made to be plastic material, such as teflon, to provide a lubricated surface for ease in movement over the metal surface of the jamb channel and balance assembly. When installed, the lower guide will project into the

recesses

24, 25 or the jamb channels to ride therein with the triangular surface forming the guide surface thereof. The triangular projection 106 of each guide 100 projects into the recess and below the hook member 60 of the respective sash cord such that the generally triangular portion of the hook conforms to the shape of the projection 106. In this position the flange portion 62 is level and the tooth projecting portion 63 is directed away from the sides of the recess and generally parallel thereto to permit the hooks to slide in the recess. A spring bias is thus supplied to the lower portion of the sash from the balance assembly in a conventional manner with the hook member sliding in the channel with window movement. The upper guides 90 ride on the projecting surfaces 40 of the balance assemblies 35 which are rigidly positioned in the extruded jamb channels so that no translational movement occurs therebetween. The flange portions 80 on each sash carry weather-stripping material to seal the surface of the sash in the jamb channel or window casing at the inner sides of the same with the weather-stripping

flanges

32 and 38 in the jamb channel bearing against the outer surfaces of the respective sashes. Thus, the sash dimensions are such as to be slightly less than the distance between the exposed surfaces of the balance assembly so that the window may be readily removed. All draft or air movement will be sealed by virtue of the weatherstripping bearing against the sides of the sash and the sides of the jamb channel on the opposite surfaces thereof as will be best seen in FIG. 6. This inner surface of the head frame 73 mounts a pair of depending weather-stripping flanges 110 which are positioned to align with the outerjamb channels or the channel for the outer sash 70 so that the upper edges ofthe same will slide between the weather-stripping material therein to seal the window at the top thereof. The lower edge of the upper sash or the frame part 74 has a U shaped or L shaped projection extending across the same as indicated in FIG. 7. The upper surface of the lower sash 75 has a similar L shaped projection on its outer surface with suitable weather-stripping material 122 carried therein and in the closed position of the double-hung sash a weather-stripping layer appears between the sashes at the upper and lower edges respectively to seal the window at this point. Plastic blocks 123 are mounted on the upper sash 70 at the ends of the flange 115 to block the air passage around the ends of the interlock or

flanges

115, 120. Further, the sill frame part 20 has weather-stripping flanges 125 aligned with the inner jamb channel for the lower sash 75 such that the lower edge of the same will be positioned therebetween. In addition, the lower sash has a transversely projecting flange portion extending from the lower frame part at an elevation slightly above the weather-stripping flanges 125 in the sill mounting part to provide a handle or grip surface for moving the lower sash in its track.

The hook member 60 has a toothed surface 63 as will be best seen in FIG. 9 which when the hook member is rotated with rotation of the sash will bite into the metal surface of the jamb channel or the side surface thereof to maintain the sash cord and hook member in an extended position when a sash is removed. Thus, upon movement of the sash up and down, the sash cord with a hook extremity of the same will follow the sash due to its positioning under the lower guide members 100 to apply a conventional spring bias to the sash to balance the same in this movement. Whenever the sash is to be removed from the casing, the upper edge of the same is gripped and the sash is rotated outwardly about an axis defined by the lower guide members 100. This rotation will cause the hook members to rotate in the jamb channel since they ride against the triangular surface 106. With rotation of the sash the hook members move to a position wherein the toothed surface will bite into the jamb channel and hold the hook 60 in position. The window is then removed by tilting the sash on'one of its guide members to clear the other lower guide member 100 from the recess or jamb channel permitting the sash to be lifted out of the window casing. Both balance assemblies on either side of the jamb channel will have the respective hook members maintained in the position of sash removal so that the sash can be reinserted and installed in the window casing by reversing the procedure. The compressible or flexible upper guide member 90 insures that the upper end of the sash will be guided on the exposed surface of the balance assemblies and the weather-stripping surrounding the sash and carried by the sash and jamb assembles, respectively, seal the sash on the sides thereof. The weather-stripping at the head frame part and on the sill frame part of the window casing similarly seal the upper and lower edges of the respective sashes in the closed position of the window.

The improved window assembly provides a simplified structure particularly adapted for metal window construction by means of which the sash may be mounted and positively guided in a window casing or in the jamb channels and yet may be readily removed therefrom for cleaning and maintenance purposes. The sash cords of the balance assemblies will be retained in a position where the sash may be reinserted so that the hooks will be underneath the lower guides on the sash to apply a spring bias to the same. The improved window construction provides a sealed unit in which the sash will be smoothly and firmly guided within the jamb channels or window casing preventing leakage around the same. The improved structure is particularly adapted for metal windows with extruded parts for low cost construction.

In considering this invention it should be remembered that the present disclosure is illustrative only and the scope of the invention should be determined by the appended claims.

What is claimed is:

l. A removable double-hung window comprising, a window casing having a pair of jamb channels along the sides of the same and extending along the height of the same, a pair of sash slidably mounted respectively in the jamb channels, a pair of balance assemblies for each sash positioned in the respective jamb channels on each side of said casing, said balance assemblies being rigidly positioned therein and having cord means removably coupled to the respective sash, said sash having deformable guide means positioned at the upper edge thereof with a notched surface to fit over the exposed surface of the balance assemblies to guide the sash thereon, and additional guide means attached to the sash at the other end of the same and positioned in the jamb channels to guide the lower end of the sash in the jamb channel to permit pivoting of the sash in the jamb channels with rotation of the sash away from the balance assemblies and the jamb channels at the upper end of the sash.

2. The removable double-hung window of claim 1 in which the guide means on each side of the sash and at the upper edge thereof include a deformable cantilever portion having a second notched surface at the extremity of the same remote from said first notched surface permitting the cantilever portion to move translationally of the sash as the sash is rotated away from the balance assemblies.

3. The removable double-hung window of claim 2 in which the additional guide means at the lower edge of the sash in cludes post means extending translationally of the sash and into the jamb channels to guide the sash therein in the areas not occupied by these balances assemblies.

4. The removable double-hung window of claim 1 in which the jamb channels are defined by recesses extending in the window casing in which the balance assemblies are positioned for each sash, said recesses extending from the top of the casing and in which the additional guide means on the sash project into the recesses and are guided therein.

5. The removable double-hung window of claim 4 and including hook means attached to the end of the cords of each of the balance assemblies which hook means bear against the underside of the additional guide means on each of the sashes and slide in the recesses of the jamb channels to apply a spring bias to the sash.

6. The removable double-hung window of claim 5 in which the hook means at the end of the sash cord for each of the balance assemblies has a triangular shaped notch therein and in which the additional guide means on the lower edge of each of the sash are generally triangular in cross section to ride into the notch in the hook means and guide the hook means in the jamb channels and which upon rotation of the sash will displace the hook means to wedge the same in the jamb channel retaining the hook and sash cord in a fixed position with removal of the sash.

7. The removable double-hung window of claim 6 in which the window casing and the sash are made of metal and the guide means are made of a plastic material.

8. A removable window comprising, a window casing having a jamb channel along the sides of the same and extending the height of the same, said jamb channel being defined by a recess in the window casing, at least one balance assembly positioned in one of the recesses in the sides of the casing, a sash adapted to be mounted in the casing and slide in the jamb channel, guide means positioned on the upper side of the sash and including a recessed deformable plate adapted to slide on the exposed surface of the balance assembly, additional guide means attached at the opposite ends of the sides of the sash and having transversely extending projecting surfaces positioned in the recesses defining the jamb channel to guide the sash with the first named guide means in the jamb channel, and means including cord means extending from the balance assembly and bearing against one of the second named guide means to bias said sash, said sash being removable from the window casing by rotating the window about the axis of the second named guide means with deformation of the recessed plate of the first named guide means to release the sash from the balance assembly and with tilting of the window to allow removal of the opposite edge of the sash with the guide means thereon from the recesses of the jamb channel.

9. The removable window of claim 8 in which the guide means on the upper edge of the sash include generally U shaped members of deformable material with one edge being attached to the sash and the other edge carrying the guide plate having the notched recess therein.

10. The removable window of claim 9 in which the additional guide means positioned at the lower edges of the sash include a flange portion by means of which the guide means are attached to the sash with the transversely extending projection generally triangular in cross section and having a width dimension substantially equal to the width dimension of the recess forming the jamb channel.

11. The removable window of claim 10 in which the means attaching the sash cord to the sash includes a hook member with a generally triangular shaped notch therein with the sash cord being attached to one side of the hook and such that the notch conforms with the triangular cross section of the additional guide means with the hook member having a width dimension when tilted greater than the width dimension of the recess forming the jamb channel.

12. The removable window of claim 11 in which the sash has a thickness dimension greater than the width dimension of the jamb channel and the balance assembly included therein and in which the casing and sash are made of a metal material with the first and second named guide means being made of a plastic material.

13. The removable window of claim 8 and including twopart weather-strip means, one part of which is included in the casing adjacent the jamb channel and adapted to bear against one surface of the sash on both side edges of the same and a second part carried by the sash and extending from the opposite surfaces thereof bearing against the window casing on both edges of the sash.

14. The removable window of claim 13 in which the weather-strip means are formed by a generally U shaped flange portion attached to the sash and casing respectively and including a weather-stripping material positioned in the U shaped flange structure adapted to bear against the sash and casing respectively.

15. The removable double-hung window of claim 1 including weather-strip means for each sash in said casing, said weatherstrip means being a two-part structure, one part of which is attached to the casing adjacent the jamb channels and extending the length of the same to abut one surface of the sash and the other part being a flanged surface attached to the opposite side of the sash and bearing against the casing.

16. The removable double-hung window of claim 15 in which the weather-strip means is formed by a flange structure attached respectively to the window casing and to the sash for each of the sash and at each of the sides thereof which flange structure is channel shaped in cross section and mounts a strip of weather proofing material therein adapted to bear against the surface of the sash and jamb respectively.

17. The removable double-hung window of claim 1 in which the pair of sash mounted in the respective jamb channels in the window casing have width dimensions such that the upper and outer sash is of a smaller width dimension than the inner and lower sash such that the upper and outer sash may be removed from the window casing from the inner surface thereof without contacting the jamb channel which is associated with the opposite sash.

18. The removable double hung window of claim 15 and including further weather-stripping means positioned between each of the sash where they overlap to seal therebetween with further Weatherstripping means positioned between the window casing and the respective sash in the closed position at the upper and lower edges of the upper and lower sash respectively.

* i i t i

Claims

1. A removable double-hung window comprising, a window casing having a pair of jamb channels along the sides of the same and extending along the height of the same, a pair of sash slidably mounted respectively in the jamb channels, a pair of balance assemblies for each sash positioned in the respective jamb channels on each side of said casing, said balance assemblies being rigidly positioned therein and having cord means removably coupled to the respective sash, said sash having deformable guide means positioned at the upper edge thereof with a notched surface to fit over the exposed surface of the balance assemblies to guide the sash thereon, and additional guide means attached to the sash at the other end of the same and positioned in the jamb channels to guide the lower end of the sash in the jamb channel to permit pivoting of the sash in the jamb channels with rotation of the sash away from the balance assemblies and the jamb channels at the upper end of the sash.

3. The removable double-hung window of claim 2 in which the additional guide means at the lower edge of the sash includes post means extending translationally of the sash and into the jamb channels to guide the sash therein in the areas not occupied by these balances assemblies.

13. The removable window of claim 8 and including two-part weather-strip means, one part of which is included in the casing adjacent the jamb channel and adapted to bear against one surface of the sash on both side edges of the same and a second part carried by the sash and extending from the opposite surfaces thereof bearing against the window casing on both edges of the sash.

15. The removable double-hung window of claim 1 including weather-strip means for each sash in said casing, said weather-strip means being a two-part structure, one part of which is attached to the casing adjacent the jamb channels and extending the length of the same to abut one surface of the sash and the other part being a flanged surface attached to the opposite side of the sash and bearing against the casing.

18. The removable double hung window of claim 15 and including further weather-stripping means positioned between each of the sash where they overlap to seal therebetween with further weather-stripping means positioned between the window casing and the respective sash in the closed position at the upper and lower edges of the upper and lower sash respectively.