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Publication numberUS2402247 A
Publication typeGrant
Publication dateJun 18, 1946
Filing dateJan 13, 1944
Priority dateJan 13, 1944
Publication numberUS 2402247 A, US 2402247A, US-A-2402247, US2402247 A, US2402247A
InventorsHarry B Green
Original AssigneeHarry B Green
Export CitationBiBTeX, EndNote, RefMan
External Links: USPTO, USPTO Assignment, Espacenet
Auxiliary window sash
US 2402247 A
Abstract  available in
Previous page
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Claims  available in
Description  (OCR text may contain errors)

June E8, 1946. v REEN 2,402,247



Application January 13, 1944, Serial No. 518,092

2 Claims. 1

This invention relates to a storm or auxiliary window sash, and more particularly to an auxiliary sash for a metal casement window or the like.

Storm sashes for the usual type of window are attached to the outside of the window frame, thereby forming a relatively dead air space for insulating purposes and decreasing the heat necessary to maintain the room or building at a desired temperature. As the more usual type of window is divided into upper and lower sections which slide'vertically, either the window or storm sash may be opened or closed without interference by the other. Usually, such a storm window is hinged at the top so that it may be opened outwardly from the inside.

A different type of window-the casement window-has come into relatively extensive use recently, particularly in apartment houses. A casement window normally has an all-metal frame provided with partitions and the spaces between the partitions are normally smaller than the panes of the previous window. Such casement windows are usually provided with one section or dOOr which is hing-ed at one side and opened by a crank mechanism at the lower end of the window. Also, a screen may be attached to the inside of the window to cover the door opening. The normal type of storm sash or storm window cannot, of course, be placed on the outside of casement windows because the door cannot be opened and also because the window frames are usually made of metal. Thus, storm sashes for casement windows are usually highly expensive and require a considerable amount of drilling or the like of the window frame. Furthermore, when the storm sash is installed the window cannot be opened. Hermetically sealed double windows have not proven a solution to the problem because it is extremely difficult to provide a suitable door therein.

Among the objects of this invention are to provide an auxiliary sash for a casement window or the like; to provide such a sash which will be easy to install; to provide such a sash which may be installed on the inside of a casement window; to provide such a sash which will blend with the easement window so as to present a more pleasing appearance; to provide such a sash which 'wil1 have optimum insulating qualities; to provide such a sash which has a door corresponding to the door of the casement window; to provide such a sash which has a door tending to prevent infiltration losses through the door of the casement window; and to provide such a sash which may be constructed easily and at low cost.

Other objects and novel features will become apparent from the following description, taken in connection with the accompanying drawing, in which:

Fig. 1 is a front elevation looking from inside a room, of an auxiliary sash constructed in accordance with this invention and affixed to a casement window;

Fig. 2 is a horizontal section through the sash and casement window, taken along line 2-2 of Fig. 1;

Fig. 3 is a fragmentary vertical section taken along line 3--3 of Fig. l, at the upper end of the sash door;

Fig. 4 is a fragmentary vertical section taken along line 4--4 of Fig. 1, at the bottom of the sash door; and

Fig. 5 is a fragmentary section illustrating weather-stripping of the auxiliary sash.

As in Figs. 1 and 2, an auxiliary sash S constructed in accordance with this invention may be applied to a casement window W. The frame ID of the casement Window, usually steel, embedded around its edges in wall ll of the building, while transparent panes ii of glass or the like are attached to the window in the spaces between .frame ill and metal partitions l3, as by putty or the like. A door pane I4 is attached to a frame l5, hinged at one side and adapted to be opened or closed, a by a lever 16 one end of which is attached to the door frame and the other end moved by a suitable mechanism actuated by a handle H. The door opening may normally be covered by a screen, attached to partitions l3 and frame lil in a suitable manner, as by screws.

The auxiliary sash S, constructed in accordance with this invention, preferably comprises a framework 20 made of wood and having partitions 2! corresponding in location to the partitions of the easement window. A wooden door frame 22 may be attached at one side by hinges 23 to one of the partitions and corresponds in position to the door of the casement window. Transparent panes 24, of suitable material such as glass, are secured in grooves 25, preferably located on the side of the framework and partitions adjacent the easement window. A transparent pane 26, preferably of the same material, is attached to door frame 22 of the sash, and the panes may be held in place in a suitable manner, as by molding 21. It will be understood, of course, that any other suitable manner of attaching the panes may be utilized, and that the panes may be opaque, or formed of material other than glass, such as plastics and the like.

That the framework and partition of the auxiliary sash correspond to the framework and partitions of the easement window provides a number of advantages. For instance, the auxiliary sash blends with, or hides, the window and there is little visual evidence of its presence. Also, the appearance of the room may be left as before by painting or otherwise coloring the framework and partitions of the auxiliary sash the same color a the framework and partitions of the easement window. 01', in the case of a living room, for instance, to harmonize more effectively with rugs, draperies, furniture covering or the like, which may be utilized in winter to brighten the room, or for other efiect, the auxiliary sash may be painted or stained a different color from the window.

In further accordance with this invention, the framework and partitions of the sash are held against the framework and partition of the window, thereby dividing the space between the two into a number of dead air spaces. This reduces convection currents and increases insulating effectiveness.

Wood is a preferred material for the framework and partitions of the auxiliary sash. Wood transmits less heat than metal and can therefore contact the metal framework and artitions of the window, thereby substantially reducing the amount of heat transferred into the room. Also, wood reduces the tendency towards moisture condensation. In addition, wood may be shaped readily to provide a decorative molding effect. Furthermore, the edges of the framework may be shaped or altered slightly so that the sash will fit tightly into the window space, without marring, gouging, or otherwise disfigurin paint 28 or other covering for the interior walls. To reduce infiltration losses, the edge of the framework may be weather-stripped and the sash frame may be rabbetted to accommodate the weather-stripping 40, as in Fig. 5, which may be formed of felt or any other suitable material.

Further to increase the insulating effectiveness of the auxiliary sash of this invention, the door frame 22 of the sash preferably is provided with a tapered or lap joint around all of its edges, to reduce the relatively large infiltration losses normally occurring around the edges of a casement window door. Also, since the partitions of the sash are held against the partitions of the window, any air filtering into the space between the sash and window doors is restricted to that space. The joint may include an overhang 29, shaped to fit against decorative molding of the partition and framework at the upper and lower edges, as in Figs. 3 and 4. Or, a double bevel lap joint with a flat space between the two bevels, may be utilized as in Fig. 2, the latter being useful in permitting the door frame 22 to hide screws 30 by which the sash is attached to th window.

Screw 30 are disposed in identical locations and engage the same threaded apertures a the screws normally used in attaching the screen.

The door of the auxiliary sash may be provided with a handle 32, connected to a suitable lever for opening and/or locking the door, while a slot 33 may be provided to accommodate the handle for locking the window door, the slot 33 being provided in a partition 2| with one edge flush with the edge of door frame 22, although it may be placed in other positions in accordance with different positions of the easement door handle. Also, a slot 34 may be provided at the lower end of the sash framework to accommodate the actuating mechanism for the window door. When the sash door is opened, the handle of the window opening mechanism normally must be placed in a downward position, but usually whenever the sash door is opened the window door will be opened also so that little inconvenience is caused.

Further in accordance with this invention, when the auxiliary sash is installed, the distance between each pane of glass in the window and each correspondin pane of glass in the auxiliary sash is at least one half inch and not more than one inch. Preferably, the distance is between one half inch and one inch, with the greatest insulatory effect obtained when the distance is between three quarters of an inch and one inch. The sash panes are preferably attached to the. side thereof adjacent the window, to permit the spacing between the panes to fall within the above limits. Tests have shown that the conductivity of heat across the space between the two panes of glass is appreciably less at one half inch than at a smaller distance; that the conductivity decreases as the dimension increases from one half to three quarters of an inch; that the conductivity decreases slightly as the dimension increases from three quarters to one inch; and that there is substantially no increase in insulating effect when the dimension is greater than one inch. Since the closer the panes are spaced, the better the appearance of the window and sash, the optimum range of spacing is between one half and three quarters of an inch. However, if necessary, certain panes such as the door panes may be spaced between three quarters of an inch .and one inch apart.

From the foregoing, it will be apparent that'the auxiliary sash of this invention is readily and cheaply made; that it provides optimum insulation without detracting from the appearance of the window; that it is quickly and easily installed and removed; and that it reduces the tendency towards moisture condensation. It will be further apparent that such a sash reduces the tendency towards both infiltration and heat conduction losses and at the same time permits relatively normal operation of the door in the window and provides access to the exterior of the window for cleaning or other purposes.

Although a specific embodiment of this invention has been described in detail, it will be understood that other embodiment may exist, such as an auxiliary sash of similar construction without a door; that materials other than wood, such as plastics, may be utilized for the frameworki and that various other changes may be made therein, all without departing from the spirit and scope of this invention.

What is claimed is:

1. An auxiliary sash for a casement window having a plurality of steel partitions with panes of glass attached thereto, a door opening outwardly, and means for opening said doorextendins inwardly from said window at the lower end thereof, said sash comprising a wooden framework having partitions corresponding to the partitions of said window and a door adapted to open inwardly and corresponding in position to the door in said window; a frame for said sash door forming a tapered lap joint with the surrounding portions of said sash framework; an aperture in the lower portion of said sash framework for accommodating said means for opening the door of said window; grooves formed in the frame of said sash door and the framework of said sash adjacent aid window for accommodating panes of glass; molding securing said panes of glass within said grooves; and means attaching said sash to said window on the inside thereof, including screws extending through the partitions at each side of said sash door and engaging threaded apertures in said window, the heads of said screws bein covered by said sash door within the angular lap joint between the frame of said door and the corresponding partitions of said framework.

2. An auxiliary sash for a casement window or the like having an outwardly opening door therein, said sash comprising a framework having partitions corresponding to those of said window and an inwardly openin door corresponding in position to the door in said window; transparent panes aifixed to said framework; and means attaching said framework to the inside of said window with the partitions of said framework against the partitions of said window and the distance between corresponding panes of said sash and window at least one-half inch but not more than three-fourths inch, said framework having a lap joint formed around the periphery of said door to reduce infiltration, said attaching means comprising screws extending through said framework in said lap joint into the stationary portion of the frame of said window, and said screws being hidden by said door when in closed position.


Referenced by
Citing PatentFiling datePublication dateApplicantTitle
US2495877 *Oct 6, 1945Jan 31, 1950Leo DemseyStorm sash
US2611933 *Nov 19, 1949Sep 30, 1952Comfort Edward FStorm door and panel construction
US2691803 *Jan 19, 1952Oct 19, 1954B & G Mfg CompanyWindow structure
US2751639 *Apr 5, 1952Jun 26, 1956Oswald Joseph HCasement window structure
US6779580Jan 20, 2003Aug 24, 2004Marvin Lumber & Cedar CompanyWood interior screen for out-swinging wood window
US6964290Jun 1, 2004Nov 15, 2005Marvin Lumber & Cedar CompanyWood interior screen for out-swinging wood window
U.S. Classification52/202
International ClassificationE06B3/04, E06B3/26
Cooperative ClassificationE06B2003/2625, E06B3/2605
European ClassificationE06B3/26C