US2638189A

US2638189A - Steel window structure

Info

Publication number: US2638189A
Application number: US247914A
Authority: US
Inventors: William C Watkins
Original assignee: Individual
Current assignee: Individual
Priority date: 1951-09-24
Filing date: 1951-09-24
Publication date: 1953-05-12
Anticipated expiration: 1970-05-12

Description

1 2, 1953 w. c. WATKINS 2,638,189

STEEL wiunow STRUCTURE Filed Sept. 24, 1951 3 Sheets-Sheet 1 FIG 2.

I b :snven-ror Bu z (Ittorneg y 1953 w. c. WATKINS STEEL wmnow STRUCTURE Filed Sept. 24; 1951 5 Sheens-Shecrv 2 3110mm: Way/w (I. I444r/r/A/5,

(Ittorneg May 12, 1953 w. c. WATKINS STEEL WINDOW STRUCTURE 3 Sheets-Sheet 5 Filed Sept. 24 1951 VIIIIIIIIIIIIII INVENTOR.

WILLIAM C- WATKINS 3 M amal A7TOR/VEY5.

Patented May 12, 1953 UNITED STATES PATENT OFFICE STEEL WINDOW STRUCTURE William 0. Watkins, Los Angeles, Calif.

Application September 24, 1951, Serial No. 247,914

My invention relates to window construction, with particular reference to a steel window or sash adapted for use in both dwellings and industrial installation, and is acontinuation-inpart of my copending application, Serial No. 732,946 entitled Steel Window Structure, filed March 7, 1947 which has been abandoned. Although there are available on the market at the present time, a number of steel framed windows of various designs, none of these windows appear to be adapted to the modern trend in architecture in which the use of low sweeping lines is emphasized. It will readily be apparent that to achieve such a sweeping effect in the appearance of a building, the windows used in its construction must be capable of being furnished in elongated lengthsl rather than in the stock sizes now available. In addition, the present windows are equipped with a complicated actuating mechanism for moving a portion of the window inwardly or outwardly for ventilation, and with the result that repairs to the actuating mechanism are usually beyond the ability of the average person. A further disadvantage of the presently'available type of steel window is the danger of it being inadvertently left in the open position during a storm or strong wind, and the extending portion being broken from its supporting pins or hinges.

To eliminate these detrimental features there have been heretofore proposed windows incorporating an integrated frame and sill within which is mounted one or more horizontally movable window sections. Such windows, however, have proved to haveother disadvantages. Many of them, for example, have not been sufliciently weather-tight to restrain the entrance of winds, moisture and dirt. Others, if made sufficiently weather-tight, have proved to be either difiicult to open and close (the movable sections tending to bind within the frame and sill), or else have proved to be subject to disagreeable rattling (the movable section being free to move laterally within the frame and sill). Hence, it is a major object of my invention to provide a window of this type having novel construction whereby although it is completely Weather-tight, it is also easy to operate and is not subject to rattling.

To this end the horizontally movable'section of my window is supported at itsupper portion by a plurality of rollers mounted upon this portion and adapted to rotate upon a horizontal guide member carried by the upper portion of the frame. The lower portion of the movable section mounts means engageable witha lower guide member carried by the sill; which means adapted to re- 7 Claims. (01. 189-64) strain lateral movement of the section within the frame and sill without restraining horizontal movement of the movable section therewithin. My window additionally includes an integrated frame and sill which may be coated with a rustproof primer prior to being delivered to the com struction job site. My window is adapted for fabrication in a variety of munten and mullion design particularly adapted to the style of architecture of the building in which it will be installed.

It is another object of my invention to furnish a steel window or sash that will be unrestricted as to design, possess a maximum light area, have astreamlined munten and mullion design and need outside screening only over that portion of the window that is slidably opened for ventilation.

Another object of my invention is toreduce the maintenance cost on steel windows by eliminating the need for counterbalances and sash weights, the use of hinges, gears and crank mechanisms and the necessity of stocking a large amount of repair parts.

A further object of my invention is to furnish a window having an extremely simple mechanical structure, and one adapted for being used. by the amateur builder who has only an elementary knowledge of carpentry.

A still further object of my invention is to provide a Window having a horizontally movable section, which window will effectively restrain the entrance of wind, moisture and dirt.

These and other objects and advantages of my invention will appear from the following description of a preferred form thereof and from the accompanying drawings wherein:

Figure 1 is a perspective view of my completely integrated steel window frame;

Figure 2 is a horizontal cross section of the device taken on. the line 2-2 of Figure 1;

. Figure 3 is an enlarged fragmentary horizontal cross section illustrating in detail the construction of the side jamb, the vertical interlocking meeting rail or mullion, and the movable section head and track channel, and one of the slidable section roller supports;

Figure 6 is an enlarged fragmentary'horizontal cross section of the upper head memberand one of the springs utilized to prevent rattling of the movable section taken on the line t-6 of Figure Figure '7 is an enlarged fragmentary perspective view of the horizontal sill and lower cros piece of the movable section;

Figure 8 is an enlarged fragmentary horizontal cross section of the lower cross piece of the movable section showing one of the springs used in preventing rattling of the movable section taken on line 38 of Figure '7;

Figure 9 is an enlarged vertical cross-sectional view of the window head member shown in Figure 5;

Figure 10 is an enlarged fragmentary perspective View of the horizontal sill and lower cross piece of the movable section similar to Figure 7 and showing another means which may be used to prevent rattling of the movable section;

Figure 11 is an enlarged fragmentary horizontal cross section taken on line I I -I I; and

Figure 12 is an enlarged fragmentary vertical cross section taken on line I2-l2 of Figure 11..

Referring now to the drawings, and particularly to Figure 1 thereof for the general arrangement of my invention, it will be seen that a rectangularframe F is formed by a horizontal sill member S, a pair of vertical side jambs J and, J disposed at each end thereof, and a horizontally positioned head member H rigidly aifixed to and supported between the pair of side jambs J and J. A vertical interlocking dividing bar or mullion M extends between the sill S and the head member H to divide the window into two sections; the section It situated on the right of the mullion M as shown in Figure 1 being stationary and adapted for view purposes, while the section II is slidably adjustable and may be used for ventilation of the room or building.

Although for convenience of illustration, I have shown sections Ill and II to be of substantially the same length, this relationship may be altered at the time of manufacture to suit the desire of the purchaser. It will be apparent that several variations in the arrangement of the slidable section I! are possible, such as: repeating the section H at both ends of the window with each section sliding inwardly; or having two sliding sections at the center of the window, each of which moves outwardly from one another to engage a mullion that may be spaced some distance in from the side jamb. The latter arrangement is particularly effective where it is desired to protect drapes situated at the end portions of the window from dust or dirt brought in through the open sections. Under most circumstances, as long a section IE) as possible will be found to be desirable for view purposes, although this will be determined by the overall length of the win- 'dow and the portion of that length which must be allotted to the movable section I I to insure proper ventilation under the most adverse climatic conditions that will be encountered.

The sill S may be fabricated in a number of different ways but I have found it preferable to form the sill as an integral unit from a rectangular sheet of metal of an appropriate gauge that is pressed into a cross section such as is shown in Figures 4 and 7. It will be noted that the sill S includes a horizontally positioned rectangular sill member !2 that turns upwardly on its rearwardly disposed edge into an angular inverted. J-shaped member I3, the function of which will hereinafter be discussed in detail. Member I3 includes a vertical upwardly extending flange I l, a horizontal forwardly projecting web I5, and a flange .I 5 extending downwardly a somewhat less distance than. the height of the flange I4,

A downward step I! situated on the forward edge of the member !2 is formed from a pair of laterally spaced risers I8 and I 9 with a horizontal step member 20 extending therebetween as best seen in Figure 4. Sloping downwardly and away from the lower edge of the riser I 9 is a rectangular sill cap 2| with a short vertical flange 22 disposed on its forward edge.

It will be seen from Figure 4 that with my window installed in a wall, any water or moisture collecting on the sill S will flow forwardly along the upper face of the cap 2|, and pass downwardly over the flange 22 to the exterior of the window supporting wall. The flange 22 prevents inward seepage of water toward the interior of the wall section, and any'attendant damage that may re sult from. such a condition.

Head member Hhas a cross section such as is shown in. Figure 9 and is formed as an integral unit from sheet metal on a press break or Yoder mill, although. in the large scale production of my window a rolled shape having the desired cross section may be advantageously used. The head member H is formed from a rectangular member 23 that is provided onv its forward edge with a downward step 24 consisting of. a pair of laterally spaced risers 25 and 26' and a horizontal connecting step member 21 as best seen in Figures 5 and 9. Both the member 23 and step 24 are identical to and in vertical alignment with the sill member I 2 and step H. An angular J-shaped track channel 28, used in movably supporting the slidable section II, extends downwardly from the rearwardly disposed edge'of member i2 and includes a supporting flange 29, a forwardly extending horizontal track web an and an upwardly projecting guide rail 3I that is somewhat shorter in height than the flange 29. Proceeding rearwardly from the lower edge of the riser 26 is a horizontal member 32 that terminates in a relatively short downturned vertical flange 33' on its rearward edge. The forward face of the flange 33 and the riser I 8 are in vertical alignment and serve as glazing supports for a stationary glass pane as will hereinafter be explained.

Each of the vertically disposed side jambs J and J includes a member 4!} having a Z-shaped cross section, and comprising a web member ll with a flange 42 extending inwardly from its rearward edge and a similar flange 43 projecting outwardly from its forward edge. Both of the flanges 42 and 43 are parallel to one another and normal to the faces of the Web member M. It will be noted in Figures 2 and 3 that the side jamb J terminates on its forward and rearward face by the flanges 42 and 43 being flush with the exterior faces of the flange M and riser I9 respectively.

Although each of the side jambs J and J includes the vertical member 40, the interior arrangement of each jamb is different. The inner face of the side jamb J which the slidable section I I contacts when in the closed position is pro vided with a vertically positioned member 44 hav ing a channel shaped cross section, that includes a pair of laterally spaced inwardly projecting

arms

45 and 45 with a web 41 extending therebetween. For convenience in the construction my window the outer face of the web il is preferably aflixed to the interior face of the web 4| by spot welding. The channel 44 is so situated on the web 4| that a substantial space is left between the rearward face of the channel flange 45 Y and. the forward face of the jamb. flange 42- asmay best be seen in Figure 3. The space between the flanges 42 and 45 is occupied by a portion. of the movable section II when it is in the closed position.

In the construction of the opposite side jamb J a vertical member 48 having an L-shaped cross section and composed of a pair of legs 49 and 50 which are disposednormal one to the other, is affixed in a vertical position on the interior face of web 40 by being spot welded thereto as may be seen in Figure 2.

The interlocking dividing bar or mullion M is preferably formed from a rectangular sheet of metal of such thickness that it may be pressed to form an F-shaped member composed of a web 5! of partial double thickness and two parallel laterally spaced flanges 52 and 53 projecting outwardly toward the jamb J as illustrated in Figures 2 and 3. Flange 53 is arranged with its forward face in vertical alignment with the forwardly disposed faces of jamb flange 5B, the sill riser. l8 and the header flange 33. Thus it will be seen that with the forward faces of these members in alignment a support is provided to prevent the rearward movement of a rectangular pane of glass 54 that fits into the stationary section ill of the window, with its lower edge resting on the upper face of the sill step 20, its upper edge against the inner face of the header member 32, and its vertical edges abutting the mullion arm 5| and web M of the side jamb J respectively. The pane 54 is held in place against the above members by putty being applied in the conventional manner.

Movable section ll includes a pair of vertical, laterally spaced end pieces 60 and GI, with each end piece being fabricated with a different cross section. The end piece 80 which engages the side jamb J when section l is in closed position is pressed from sheet metal and has a substantially square U-shaped cross section that includes a pair of laterally spaced, parallel, flanges 62 and 63 with a connecting web The flange 62 is longer than the flange 63, and is bent back upon itself to form a lip 65 that extends inwardly toward the mullion M above the inner face of the web 54 as best seen in Figure 3. The vertical end piece 6! is preferably formed from a rectangular strip of sheet material by pressing same to have a Z-shaped cross section that includes a pair of parallel arms 58 and all with a connecting web 68. By bending the outer portion of each of the flanges '66 and 67, a pair of parallel ribs E35 and '10 are provided that extend inwardly toward the mullion M. It will be noted in Figure 2 that the forwardly disposed faces of the lip 65 and rib 69 are in alignment and serve as vertical supports to prevent the rearward movement of a rectan gular pane of glass or other transparent material ll that extends therebetween. The rib 1D, with the section I l in the closed position, engages the opening between the mullion flanges 52 and 53 to form an interlocking wind-proof joint. A horizontally positioned top and bottom cross piece 12 and [3 respectively, each having a Z-shaped cross section, extends between the end pieces (in and 6!. Each of the

cross pieces

12 and 13 includes a pair of parallel flanges 'M and i5 that extend outwardly in opposite directions and in unequal distances from a connecting web it as may best be seen in Figure l. Flange M, which is of somewhat greater depth than flange ?5, projects outwardly from section I l and has its rearward face disposed a slight distance in from the sill flange l6 and header flange 3!. The flanges 15 extend inwardly toward one anothery'and have their forwardly disposed faces in vertical alignment with the forward face of the lip 65 and rib "69 to serve as supports to prevent the rearward movement of the pane H.

For movably supporting the section I i a downturned L-shaped member 11 that includes a vertical and

horizontal arm

18 and 19 respectively, is amxed by welding to the upper edge of cross piece flange 4 at each end thereof. Rotatably supported from the arm 18 by a horizontal shaft as that engages both members is a roller 8| which travels along the upper face of the channel web 36 as best seen in Figures 4 and 5. To prevent the movable section H from rattling or vibrating, a second down-turned L-shaped member 82, having a vertical and horizontal arm 83 and 84 respectively, is disposed inwardly from each of the L-shaped members 11 and secured to the upper edge of theflange 14 by welding. A horizontally positioned elongated rectangular spring 85, preferably of Phosphor bronze, and having a central portion 85 that fits against the forwardly disposed face of the arm 63, is aflixed thereto by a rivet it? that engages both members. An outwardly disposed portion 83 of the spring is bent to contact the forward face of the header flange 29 and the inwardly disposed spring portion 39 is likewise bent to contact the rearward face of the flange 3 l.

Supported at each end of the movable section H from the lower edge of flange H, as may best.

be seen in Figures '7 and 8, is a rearwardly extending upturned l.-shaped member to having a vertical and horizontal arm 9! and 92 respectively. A. substantially horizontal elongated rectangular Phosphor bronze spring 93 is affixed to the forward face of the arm 92 by a rivet 94 and with one end portion 85 of the spring bent rear- Wardly to contact the forward face of the flange i4 and the opposite end portion 93 likewise is bent to contact the rearward face of flange 16. Thus it will e seen that by the use of the springs i355 and 533 any rattling or vibration of the movable section M is eliminated.

It should be understood that other means may be utilized to restrain any rattling or vibration of the movable section l I in place of the springs 85 and Thus, in Figures 10, 11 and 12 there is shown a roller element H2 rotatably mounted by a vertical pin lid, which pin is secured at its lower end to the forward face of the arm 82 of the cross piece 13. This roller element H2 will preferably be formed of natural or synthetic rubber and will have a diameter equal to or only slightly smaller than the horizontal distance sepaerating the forward and rearward faces of the flange id, as shown in Figure 12. Hence, at all times the periphery of the roller element H2 will be engagement with one of these faces whereby a plurality of these roller elements may be substituted for the plurality of springs 85 and 93 as rattling preventing means. It should also be noted that these roller elements i l2 are shown mounted only on the lower cross piece it and not on the upper cross piece 12, inasmuch as it has been found possible to eliminate rattling of the movable section by employing roller elements or springs on the lower cross piece alone.

In order that the slidable section if may not be opened from the outside by thieves or wouldbe trespassers, a conventional lock Hill is affixed in a convenient location on the end piece 6t as best seen in Figure 2, a bolt I9! that may be actuated by a handle Hi2 slidably engages a cylindrical receptacle H33 that is rigidly'afflxed in a horizontal position to the vertical jamb flange 42. Such a locking mechanism permits the slidable section II tobe placed in the open position only from the interior of the room or building in which my window is located.

As the section H is the only portion of my window adapted for being moved, a rectangular screen we may be inserted in vertical alignment with the pane 54 between the interior faces of the side jamb J and mullion M. The screen is provided with the usual wire mesh body H35 in a rectangular frame the that on three sides is preferably formed from flat metal strip it? and on the fourth side with an inwardly extending flange H28. On the rearwardly extending edge of flange H38 are several hooks tilt that may be formed from either wire or strap and are used to engage the mullion flange 52 as best seen in Figure 2. The screen EM is put in place by having the hooks Hi9 engage the flange S2 with. the screen fiange Elli; situated adjacent to the mullion web The three sides of the frame Eta are disposed the interior faces of sill step til, side jamb J, and header arm and held thereon by a number of machine screws i it that engage both the screen frame and window rnerr here. It will be noted that such screening the advantages of ease of installation and removal, being relatively small in size and light in weight, and requiring a minimum of storage space.

In the installation of my window, an opening sufficiently large to receive the frame F is left in the studding the wall with suitable cross framing for the windows support. Blocking is inserted between the studs and the exterior face of the side jambs J and J" and the window secured thereto by driving nails through openings (not shown) provided in each of the side lambs. With the window frame F in place the sheet weather-proofing material used in the construction of the uilding is brought downwardly to horizontal line formed at the junction of the header riser 25 and step ill, where it may be easily cut by the use of a sharp instrument. The balance of the exterior portion of the wall section is now constructed, with the outer surface of the finished wall being forwardly disposed from the exterior race of the riser 25. It will be apparent that inward seepage of water from the outer surface of the wall is impossible due to the upwardly extending riser 25 and the sheet weather-proofing material used in the wall construction lapping over it. Along the side lambs J and J the flanges it overlap the blocking material as does the sheet weather-proofing material and an exceptionally weather-tight construction is thus secured. The downwardly extending sill flange 22 insures that any water or moisture accumulating on the sill S will flow to the exterior surface of the window supporting wall structure, rather than under the sill cap 2 I. As the. sill E3 is made integral with the frame F, a more. economical as well as weather-proof winclow construction is assured by the use of my window.

The operation of my window when installed is extremely simple, as its only moving part is the section II. It will be seen in Figure 3 that with section ll in the closed position a wind and weather-proof joint is secured not only at the mullion M, by the end piece rib l0 interlocking between the mullion flanges 52 and 53, but that the same result is achieved at the side jamb J as the flange 54 engages the opening between the section H and flanges 62 and 63.

Movement of the section II requires little manual effort due to the section being rotatably supported on each end by a roller 8| that travels along the upper surface of header web 30, as best seen in Figure 5. The junction of the movable section H with the inner portion of the head member H is substantially wind-proof due to the overlapping of the section H, flange M with the header flange 3|. Although for the purpose of clarity a substantial distance is shown in Figure 4 between the forward face of the flange 3| and the rearward face of the flange 14, in actual practice this is a very snug fit.

As the section I l is moved back and forth, the springs and 93, shown in Figures 5 through 8 will be at all times in slidable contact with the vertical faces of the

cross pieces

72 and 13 so as to restrain any rattling thereof within these cross pieces. With this arrangement, there is absolutely no binding tendency between the movable section and these cross pieces. The same results may also be accomplished by use of the roller elements H2 shown in Figures 10, 11 and 12. With respect to these roller elements, it will be realized that their supporting shafts H4 need not have their axes on a common vertical plane extending parallel to the cross piece l3, but rather these shafts may be mutually offset from such plane whereby a certain roller or rollers will be engageable with only one of the interior vertical faces of the cross piece while the other roller or rollers will be engageable with the opposite vertical face. It will also be apparent that the lateral positioning of the shafts H4 may determine whether the external surface of the vertical flange it will slidably engage the interior vertical surface of the cross piece l3 adjacent thereto.

Although I have shown the preferred form of my invention as particularly adapt-ed for window construction, it will readily be apparent that by replacing the transparent panes Fi l and ll with an opaque material, a slidable door may be obtained. It will also be apparent that due to the unique construction of the head member H it may be used separately from the window as a support for hanging slidable doors or windows.

While the apparatus herein shown and described is fully capable of attaining the objects and providing the advantages hereinbefore mentioned, it is to be understood that it is merely illustrative of the presently preferred form of my invention, and that I do not mean to limit myself to the details of construction or design herein shown, other than as defined in the appended claims.

This application is a continuation-in-part of patent application Serial No. 732,946 filed by me March 7, 1M7 and bearing the same title as this application which has been abandoned.

I claim:

1. A window structure which includes: a substantially rectangular frame provided with a head member and a sill member; a horizontally extending upper guide member of substantially J-shaped cross section formed on said head memher; a longitudinally extending lower guide member of inverted J-shaped cross section formed on said sill member; a substantially rectangular section situated within the confines of said frame; a plurality of downturned L-shaped members affixed to the upper portion of said section, with each of said members having an that projects downwardly into said upper guide member; a plurality of rollers, with each of said rollers situated within the confines of said upper guide member and rotatably supported from one of said arms, said rollers movablyconnecting 'said'section to said upper guide member whereby said section may be moved horizontally in said frame; a plurality of upturned L-shaped mem- T bers affixed to the lower portion of said section,

with each of said springs supported by one of said arms, and slidably engaging the interior vertical surfaces of said lower guide member to restrain lateral movement of said section.

2. A window structure which includes: a sub stantially rectangular frame provided with a head member and a sill member; a horizontally extending upper guide member of substantially J-shaped cross section formed on said head member; a longitudinally extending lower guide member of inverted J-shaped cross section formed on said sill member; a substantially rectangular section situated within the confines of said frame, with said section having upper and.

lower horizontal members of angular cross section complementary to said upper and lower guide members to form substantially overlapping joints with said guide members so as to windproof the joints; a plurality of longitudinally spaced downturned L-shaped members affixed to the upper portion of said frame, with each of said members having an arm that projects downwardly into said upper guide member; a plurality of rollers, with each of said rollers situated within the confines of said upper guide member and rotatably supported from one of said arms, with said rollers movably connecting said section to said guide member; a plurality of upturned L-shaped members aflixed to the lower portion of said section, with each of said members having an arm that extends upwardly into each lower guide member; and a plurality of transversely extending springs, with each one of said springs being supported by one of said arms, and slidably engaging the two interior vertical surfaces of said lower guide member to restrain lateral movement of said section.

3. A window structure which includes: a substantially rectangular frame provided with a head member and a sill member; a horizontally extending upper guide member of substantially J-shaped cross section formed on said head member; a longitudinally extending lower guide member of inverted J-shaped cross section formed on said sill member; a substantially rectangular section situated within the confines of said frame, with said section having upper and lower horizontal members of angular cross section that form substantially overlapping joints with said guide members so as to wind-proof the joints; a plurality of longitudinally spaced down-turned L-shaped members aflixed to the upper portion of said section, with each of said members having a roller rotatably mounted thereon, said rollers movably connecting said section to said upper guide member for horizontal movement in said frame; a plurality of upturned L-shaped members afiixed to the lower portion of said section with each of said members having an arm that extends upwardly into said lower guide members; and spring means affixed to a portion of said L-shaped members amxed to the upper portion of said section and on all of said L-shaped members affixed to the lower portion of said section, with said spring means engaging the interior 10 vertical surfaces of said guide members to restrain lateral movement of said section.

4. A window structure which includes: a substantially rectangular frame formed with a head member, a sill member and two end members that have a mullion intermediately positioned therebetween with said frame having an upper horizontally extending guide member of J -shaped I cross section formed on said head member and a lower guide member of inverted J-shaped cross section formed on said sill member; a rectangular section situated Within the confines of said frame, with said section having upper and lower members of angular cross section complementary to said upper and lower guide members to form substantially overlapping joints with said guide members so as to wind-proof the joints, said upper and lower members being connected'by vertical end pieces; roller means affixed to the upper portion of said section and engaging said upper guide member to movably support said section therefrom; a plurality of longitudinally extending springs affixed to both the top and bottom of said section, with each one of said springs being situated within the confines of one or the other of said guide members and slidably engaging the vertical walls thereof to restrain rattling and lateral movement of said section; and sealing means formed on said vertical end pieces of said section which are adapted to engage one of said end pieces of said frame and said muilion when said section is in the closed position to form a substantially wind-proof joint.

5. A window structure which includes: a substantially rectangular frame provided with a head member and a sill member; a horizontally extending upper guide member of substantially J-shaped cross section formed on said head member; a longitudinally extending lower guide member of inverted J-shaped cross section formed on said sill member; a substantially rectangular section situated within the confines of said frame; a plurality of down-turned L-shaped members affixed to the upper portion of said section, with each of said members having an arm that projects downwardly into said upper guide member; a plurality of rollers, with each of said rollers situated within the confines of said upper guide member and rotatably supported from one of said arms, said rollers movably connecting said section to said upper guide member whereby said section may be moved horizontally in said frame; a horizontally extending arm formed. on the lower portion of said section, said arm extending below said guide member; and a resilient roller element mounted upon said arm for rotation about a vertical axis, the periphery of said roller element being engageable at all times with at least one of the vertical interior surfaces of said lower guide member so as to restrain lateral movement of said section.

6. A window structure which includes: a substantially rectangular frame provided with a head member and a sill member; a horizontally extending upper guide member of substantially J-shaped cross section formed on said head member; a longitudinally extending lower guide member of inverted J-shaped cross section formed on said sill member; a substantially rectangular section situated within the confines of said frame, with said section having upper and lower horizontal members of angular cross section complementary to said upper and lower guide members to form substantially overlapping joints with said guide members so as to wind-proof the assures io nt a plurality oi l ngit dinally paced downturned LV-shaped members aifi-xed; to the upper portion of said frame; with; each of said, members haying an; arm that projects downwardly into upper guide member; a; plurality of rollers, v

with; each of; said rollers situated Within the eenfines of said upper guide member and rotatthbi supported from one of said arms, with said rollers movably supporting said section from said guide member; a horizontally extending arm formed onthe lower portion of, said section, said arm extending below said guide member; and silient roller element mounted upon said armto-rota-teabout a vertical axis, the periphery of said roller element being engageable at all times. withat least one of the vertical interior surf es of said lower, guide member so as to restrainlateral movement of said section.

7. A window structure which includes: a substantially rectangular frame provided, with, a ead member nd a sill member; a horizontally extending; upper guide member of substantially Jrshapedeross section iormedon said head member; a longitud-inall extending lower guide member of inverted J.-shaped crosslsection formed on saidsillmember; a substantially rectangular seetionl ituatedi Wi hinthe. confines of saidframe; a plurality of downturned. L-shaped members affixed tov the upp r portion at said, section, with 12 each of: said. members having an arm'that projects downwardly into said upper guide member; a plurality of rollers, with each of said rollers situated within. the confines of said: upper. guide member and. rotatably supported. from one of saidarms, said rollers movably connecting said section to said upper guide member whereby said section may be moved horizontally in said frame; a horizontally extendingv arm formed on the. lower portion. of said section, said arm extending below said lower guide, member; and a transversely extending guiding element supported said arm and being. engageable at all times with at least one of the vertical interior surfaces of said lower guide-member so as to. restrain lateral movement of said section.

' WILLIAM C. WATKJNE.

References. Cited in the file of this patent UNITED STATES: PATENTS