US2290842A

US2290842A - Window channeling

Info

Publication number: US2290842A
Application number: US307080A
Authority: US
Inventors: Russell J Bush
Original assignee: General Tire and Rubber Co
Current assignee: Aerojet Rocketdyne Holdings Inc
Priority date: 1939-12-01
Filing date: 1939-12-01
Publication date: 1942-07-21
Anticipated expiration: 1959-07-21

Description

l) 2'1, 1942- R. J. BUSH 239G842 WINDOW CHANNELING Filed Dec. 1,1939 2 Sheets-Sheet l INVENTOR I17. 5 RUSSELL J. BUSH ATTORNEYS Jul 21, 1942.

"R. J. BUSH WINDOW CHANNELING Filed Dec. 1, 1939 2 Sheets-Sheet 2 Q 0 H MM is INVENTOR RUSSELL J. BUSH 4% ATTORNEYS Patented July 21, 1942 r WINDOW CHANNELING Russell J. Bush, Wabash, Ind., assignorto The General Tire & Rubber Company, Akron,

a corporation of Ohio Application December 1, 1939,, Serial No. 307,080

(Cl. 29fi-e-44t5) 10 Claims.

This invention relates to window channeling and the like, and more particularly to an improved metal core for useinsueh channeling and to the method of its manufacture.

It is an object of the invention to provide a sheet metal channel core having increased strength and rigidity and which may easily be bentordeformed in adapting the window channeling to thecontours of awindow. More specifically, the invention aims to provide a metal core for channels in which the elements are so arranged that upon bending of the core the transverselyextending elements are subjected to bending stresses.

Another object is to provide a core having transverse metal straps'which are initially subjected to bending stresses during manufacture of the core of the character produced therein when the completed channel is bent around a curved window edge or opening.

Another object of the invention is to provide a window channel relativelysimple .in design and construction and inexpensive to manufacture. Other objects and advantages, such as improvements in the strength ofthe device and improvements in its method ofmanufacture, will become apparent from the following detailed description, in which like parts throughout the several views are indicated by the same numerals of reference.

Figure l is a perspective View, partly in section and with part of the cushioning material removed, showing a window channel embodyingthe principles of the present invention;

Fig. 2 is a fragmentary detail showing the man,- ner in which the sheet metal is slit or perforated "in forming my improved channel core;

Fig. 3 is a fragmentary detail showing the appearance of my channel core after the sheet metal strip has been slit and expanded;

Fig. 4 is a fragmentary detail similar to Fig. 3 showing the core strip with the edges thereof wrapped or folded around the reinforcing wires to form beads;

Fig. 5 is a diagrammatic illustration, partly in section and with parts broken away, showing apparatus suitable for use in making the perforated core strip of the present invention;

Fig. 6 is a perspective view, partly in section and with part of the cushioning material removed, showing a window channel having a core of modified construction and embodying the principles of the present invention;

Fig. 7 is a fragmentary detail showing the manner in which a flat strip of sheet metal is slit to make the core shown in Fig. 6;

Ohio,

7 comprises a metal core having a series of straps I which extend transversely across the width of the channel, including the spaced sides and bottom thereof, and .terminateattheir ends in generally tubular shaped discontinuous beads 2 which receive a .pair of approximately parallel 'longitudinally extending bead reinforcing wires 3. The core, including the beads and wires, isenclosed in a suitable cushioning material 4, such as rubber or the like, by passing the core through a tubing ,machine or between formed mill rolls or through a calender, according to well known practice. Desirably, a fabric reinforcing strip or St ps 5 m y be placed over the rubber to protect and reinforce the same. The rubber body ,4 is disposed on both the inside and outside of the han el and is in erlocked with the core throu h pen n s 5. and 8 indie latte T e openin s Band 1 a apnroxim te y diam nd h ped, while th open n s i are s bsta ia ly trian u r or V- sbape h w d n s of e op ni sl t 8 being a a n th bead Wire D amsm shaped openings or lo fiar d spos d a rqssth w dth o t e cha e c r h tte extend n a p ox maiem ro b ndin line ID t r endine li e H of he hinne Th eman s a e s e s er qe n e l ext nd hro g t e s Wa s of he channe w be wee th t gul r q enines B and i irqi e the co -e hi em w n h end o th o e in 6- Th wi est a ts o 1 1 Slots l ,arein the-region of the bends ill and H.

Preferably, the bead wires '3 have a sliding fit in the tubular beads 2 so as to permit the latter to move longitudinally on the bead wires when the channel core is bent in adapting the e to the contours of a window. Also, spaces l2betw.een' adjacent beads' perinit the movement of the beads toward and away from one another on the wires.

Each of the relatively short tubular beads 2 is integral with aplufality of the straps I. In the embodiment illustrated, two st'raps are joined atitheir ends" andare integralwith a bead on each of the bead wires. The straps of each pair which are connected at their ends to common be ds d v r rQ on an e ove t side walls of the channel core and at the bends in and H are connected at M to corresponding portions of the next adjacent pairs of straps. Across the bottom of the channel the straps of each pair converge toward one another and are secured together at the center of the core by an integral connection I 5. In this manner each strap is connected to adjacent straps at spaced points across the channel and alternately to straps on opposite sides so that when the channel is deformed in bending the same around window contours, the individual straps may be deformed laterally in the plane of the original strip to accommodate the greater radius of curvature imposed upon either the bead or the back of the channel relative to the other.

The core is preferably formed of a relatively thin strip of sheet metal such as that illustrated in Fig. 2. A series of staggered perforations or slits are formed across the width of the strip to partially sever the same. Perforations or slits l6 of one group extend inwardly in parallel relation to one another from one edge thereof to adjacent, but short of, the bending line I I, while slits or perforations I! extend inwardly in parallel relation to one another from the opposite edge of the strip to adjacent the bend line Id. In alignment with the slits l6 and I1 and disposed in the central portion of the strips are parallel slits I3 which extend to adjacent, but short of, the bend lines l9 and H, thus leaving lands or unsevered portions I9 separating the ends of the slits I 3 from the inner ends of the slits l6 and IT. The lands or connections I 9 (which become the connections l4 when the strip is bent to channel form) constitute the portions of the strip unsevered by the perforations or slits and serve to retain the continuity of the strip.

Between the perforations l6 and I8, along one side of the strip, is a group of parallel perforations 29, and along the opposite side of the strip, between the perforations or slits I1 and I8, is a group of parallel perforations 2| which are aligned with the perforations 29 but separated therefrom at their inner end by lands or connecting portions 22 which later become the connections I5. The slits or

perforations

20 and 2| do not extend through the marginal edges of the strip, thus leaving tab portions 23 which, when rolled or otherwise formed into cylindrical shape, become the tubular beads 2.

After formations of the slits l6, l1, I8, 29 and 2|, the strip is elongated by stretching or otherwise so as to expand the same and bend the straps laterally to form the transverse slots or

openings

6, 1 and 8, in place of the perforations or slits. In this expanding operation the edges of the slits IS, IT, I8, 29 and 2| move away from one another and the straps I are subjected to increased stress adjacent the

connections

19 and 22.

Normally, elongation of the slitted strip when the same is not confined results in a twisting or bending of the individual straps. It is desirable, therefore, that suitable means be provided during the elongation of the strip to prevent such twisting of the bands so as to restrict their deformation to lateral bending, as shown in Fig. 3, or to reshape the strip after elongation to flatten the same. Hence, as an alternative to restraining the strip against objectionable deformation during expansion of the same, I propose to pass the expanded strip through suitable apparatus for flattening the individual straps so as to shape them to approximately the form shown in Fig. 3.

The expanded strip with the individual straps 1 thereof flattened and bent laterally in the plane of the original strip is passed through a suitable apparatus (not shown) which bends the tabs 23 around the bead wires 3, the latter being advanced or moved simultaneously with the strip and at the same speed. In this manner the composite beads 2 are formed in parallel relation to one another along opposite edges of the core. Thereafter the core is covered with the cushioning material 4 and the reinforcing fabric 5, if desired, and bent along the lines In and II to form the desired U-shaped channel.

In Fig. 5 is illustrated in diagrammatic form a suitable apparatus for forming a thin sheet metal strip to provide a strip such as that shown in Fig. 3. A plain strip 25 of thin flexible sheet metal is advanced between a pair of driven cutting and forming rolls 2% and 21 rotatably mounted on

suitable shafts

28 and 29 carried in journals of a suitable supporting structure, not shown. Pressure may be applied to the axle or shaft 28 of the top roll 26 by means of a block 30 or the like acting under the influence of a screw 3| so as to force the faces of the rolls together. Suitable cutting or perforating teeth 33 are formed on the faces of the

rolls

26 and 21 and cooperatively pierce the strip 25 to form therein the desired slits, heretofore described, as the strip passes between the rolls.

Suitable means, not shown, is provided for driving the shaft 29. This shaft, in addition to actuating the roll 2'! carried thereby and the roll 29 interlocked with the roll 21, has secured thereon a gear 34 which drives by means of an intermediate gear 31 a gear 35 secured on a shaft 36. Slitted strip material emerging from between the rolls 26 and 2'! is carried over a cylindrical roll or drum 39 secured on the shaft 36 and driven thereby in synchronous relation to, but at a slightly greater surface speed than, the slitted

rolls

26 and 21. The strip is held against the drum 39 by means of a pressure roll 49 acted on by a screw 4| bearing against journal block 42 which supports shaft 43 of the pressure roll. The increased or greater speed of the

rolls

39 and 40 relative to the

slitting rolls

26 and 21 stretches or expands the slitted strip so as to form the diamond shaped and tapering transverse slots 6, l and 8, previously mentioned. As the expanded strip passes over the drum 39 and between the drum and the pressure roll 49, it is flattened so as to straighten the bends or kinks formed in the straps during the expanding process.

In first passing the expanded strip in a curved path over the drum 39, the latter smoothes the individual straps I of the expanded strip, tending to flatten the twisted straps against the surface of the drum so that when pressed between the drum and the pressure roller the straps are fiattened rather than crushed or otherwise objectionably deformed.

After coming from between the

smoothing rolls

39 and 49 the strip is approximately in the shape or condition illustrated in Fig, 3. Thereafter the tabs 23 are folded or rolled over the bead wires 3 to form the reinforcing beads shown in Fig. l. The composite core may be then passed through a tubing machine or similar device for applying the rubber covering or cushion material 4, after which the reinforcing and protective fabric cover 5 may be applied. Preferably, the composite core is passed through the tuber or rubber coating machine in flat shape prior to being ibent along the lines l-Band I I. In-such-case the assembled strip is passed through a forming machinewhi'ch progressivelyfolds the same along the- -bend llines lil andll to form the channel shaped -'dev-ice illustrated in-Fige l. If desired, however, i the composite coresuchas shown in Figi-imay be first passed through the forming machine to bend it into channel shape and then passed through'the tuberor rubber coating machine to apply the cushion rubber-4.

'I'h'ere are numerous :advantages inherent in a structure ofthis" character. Inthe expanding andpressing-process the straps I aresubjected to lateral deformation in he plane of the original flat strip. This deformation results in increased stress adjacent the connecting portions l6 and 1-5. When-bending the channelarounda window contour'the straps are subjected to increased stress adjacent the connecting portions I4 and I5,=which yield so that the core may accommodate itself to the particular curve being fitted. This bending of the core also-effects further lateral-deformation or-bending of the straps l in thea'plane of theorigihal' metal strip from which the core is-made.

When-finally shaped-to the desired ccntour, a channel incorporatingla core of the character disclosed herein exhibitsincreased resistance to deformation which would return it to original straight shape. Therefore, the present invention provides a channeling core which tends-to retainits formed shape and has increasedrigidity and strength. In this connection it is to be noted that the portions of the straps which form the'side walls of the core are diagonally disposed with respect to one another. It is recognized that this type of structural element is of greater strength than parallel structural elements which tend to shift laterally. Similarly, the portions of theistraps which form :the bottomof the core are diagonally disposed with respect to one another and at'their adjacent points are connected together so as to resist shiftingof the straps relative to one another.

In Figs- 6 through 9 is illustrated a modification of the invention in which the transverse straps of the core have relatively wide portions 45 disposed across the bottom of the channel and relatively narrow portions 45 and 4'! disposed in the side walls of the channel. The strap portions G6 and ti? are integral with the strap portions 45, being formed into the latter at'or adjacent the bends IE and H and diverging from one another toward the bead wires 3. Thus each of the relatively narrow strap portions 41 which is integral with one of the wide strap portions 45 extends diagonally toward the narrow strap portion 45 which is integral with the next adjacent wide strap portion 45. The tubular heads 2 are formed on the ends of the narrow strap portions 46 and l? which extend from adjacent wide strap portions 45. In this manner the successive wide strap portions of the channel core are connected to one another through the relatively short beads 2.

The mamier of slitting a continuous strip of thin sheet metal to form the core illustrated in Fig. 6 is shown in Fig, 7. Short slits 43 are formed in the edges of the strip in spaced parallel relation to one another. These slits extend inwardly from the edges of the strip substantially to the bend lines it and H. Transverse slits 49 are formed across the strip intermediate the slits 48 and extend substantially from side to side of the strip but not through the marginal edges thereof,

thus-providing tabs 5il between thesli-ts lii which are'later-iormedin to the tubular beads 2.

The slitting of the continuous strip may -be carried out-as previouslydescribed in connection with Fig. 5-and-when the strip--isexpanded and fiattened 'it takes substantially the appearance illustrated in Fig-8. In thisfigure the portions of the-stripsepara-ted from one another by the slits llihave moved apart and when the core is bent will-form the relatively -W-ideportions 45 of the transverse'straps. The elongation-ofthe strip'has caused'a lateral deform'ation'ofthe portions of-the stripbetween theslits lfi and the ends of the slits &9. These deformed portions of the strip'have beenoffset substantially inthe pla-ne'of the original strip-and when the core is bent to channel form constitute the relatively narrow strap portions iii and W.

In Fig. 9 the expanded strip is shown with the tabs 58 rolled-about the-bead wires'3- to form the longitudinally spaced tubular beads 2. Spaces 51 between the-successivebeadsare continuous with substantially triangu1ar-- slots 52 which extend from the beads'to' the-bend lines it and H. Slots 53 between the relatively wide portions 55 of the transversestraps'have'tapered ends 55 which extend from approximately the bend lines Hi and H to adjacent the beads 2 and when the core is bent to its final form are disposed in the side walls of the channel.

This embodiment of the invention has greater flexibility than the'embodi-ment previously described since the transverse straps are separated from one another substantially from side to side of the channel cor-e from beadto bead. Accordingly, this form of the-invention provides a window channel of increased flexibility that can be bent around relatively sharp curves without objectionable deformation to the core. The divergent leg portions 46 and it of the transverse straps resist a movement of thestraps in a longitudinal direction which might result in collapse of the channel. For this reason a core of the character described is of greater strength'than cores which do not have the combination of relatively wide strap portions with divergent leg portions disposed in the side walls of the channel.

Window channels formed with cores made according to the principles of this invention have improved characteristics of strength and durability and may be made more economically than cores which require portions of the cheap metal strip to be removed since the cores of the present invention are made Without waste of metal and the elements of the transverse straps are so disposed as to reinforce the core against undesirable deformation.

The principles of the present invention may be utilized in various ways, numerous modifications and alterations being contemplated, substitution of parts and changes in construction being resorted to as desired, it being understood that the embodiments shown in the drawings and described above are given merely for purposes of explanation and illustration Without intending to limit the scope of the claims to the specific details disclosed.

What I claim is:

1. A core for Window channel comprising sheet metal straps extending across the width of the core and each strap connected to one of the adjacent straps at spaced points, beads on the ends of the straps, and reinforcing wires threaded through the beads, the beads on each Wire being relatively short and separated from one another to permit relative movement thereof on the wire in bending the core and adapting the same to a window opening.

-2. A flexible window channel comprising a metal core and a covering of cushioning material for the core, said core being of substantially U shape and having a series of strap portions disposed in side by side relationship, each strap portion including a relatively wide portion in the bottom of the channel and a pair of divergent narrow portions in each side wall of the channel.

3. A core for a flexible window guide comprising U shaped metal straps disposed in side by side relation to form a channel structure having bottom and side walls, each strap including a relatively wide portion in the channel bottom and a pair of divergent relatively narrow portions in one of the side walls.

4. A core for a flexible window guide comprising a sheet metal channel having bottom and side walls, a plurality of transverse slots in the channel metal to form transverse straps in pairs, each pair of straps having'both their ends formed into integral tubular beads disposed along the edges of the side walls, and the beads of successive strap pairs being separated from one another to form a discontinuous bead along the edge of each side wall.

5. A core for a flexible window guide comprising a sheet metal channel having bottom and side walls, slits in the channel to form narrow transverse straps in pairs. the ends of th straps of each pair being integral and formed into tubular beads disposed along the edges of the side Walls, the beads of each pair being spaced from the adjacent beads, reinforcing wires extending through and connecting the beads, and integral connections joining adjacent pairs of straps in the plane of the base.

6. A flexible window channel comprising a thin metal core bent along its length to form base and side portions, and a covering of cushioning material for the core, said core including a series of transverse straps angularly disposed with respect to one another and integrally connected in pairs at the juncture of the base and side portions.

7. A flexible window channel comprising a thin metal core having parallel bends along its length to form base and side portions, and a covering of cushioning material for the core, said core including a series of transverse straps each of which is formed with a plurality of bends in its plane and is integrally connected to one of the adjacent straps at the bends.

8. A flexible window channel comprising a thin metal core having parallel bends along its length to form base and side portions, and a covering of cushioning material for the core, said core including a series of transverse straps and open slits between the straps to receive the cushioning material in interlocking relation, some of the slits extending through the side portions only to the bends and others of the slits extending through the bends continuously across the base and at least one of the side portions.

9; A flexible window channel comprising a thin metal core and a covering of cushioning material, said core including a series of transversely extending straps each of which is integrally connected at a plurality of points to the adjacent straps, the points of connection to one of the adjacent straps being spaced along the length of the strap from the connection to the other adjacent strap so that in bending the channel to a window contour each of the straps is bent laterally in its plane at several points along its length.

10. A core for a flexible window guide comprising a channel of thin sheet metal having side and bottom portions, said core being formed with elongated transverse slots having pointed ends, some of said slots extending continuously across the bottom portion of the channel and at least one of the side portions, and others of said slots extending across substantially th entire width of the side portions and disposed wholly within the side portions.

RUSSELL J. BUSH.