US3274676A - Methods of making shades - Google Patents

Description

p 27, 1966 J. E. GALLAGHER ETAL 3,274,676

METHODS OF MAKING SHADES 2 Sheets-Sheet 1 k 1 s. i L.

INVENTORS JOHN E. GALLAGHER BRYSON McCULLOCH y ORIN N. CRIDER Original Filed May 21, 1962 ATTORNEYS P 1966 J. E. GALLAGHER ETAL 3,274,676

METHODS OF MAKING SHADES 2 Sheets-Sheet 2 Original Filed May 21, 1962 nvm j Nm mm 5 H G M & m a 5 n a m h m 1 m a m m I 3,274,676 METHODS OF MAKING SHADES John E. Gallagher, Flossmoor, Orin N. Crider, Chicago Heights, and Bryson McCulloch, Flossmoor, 11]., assignors, by mesne assignments, to Slick Industrial Company, Chicago Heights, Ill., a corporation of Delaware Continuation of application Ser. No. 197,185, May 21, 1962. This application Oct. 31, 1963, Ser. No. 320,274

9 Claims. (Cl. 29400) This application is a continuation of application Serial No. 197,185, filed May 21, 1962, now abandoned.

This invention relates to methods of making shades for windows and the like.

It is still prevalent practice, and has been for many, many years, to utilize wood rollers primarily for reeling a window shade or blind, although metal rollers, which are not as satisfactory for many reasons, have been used to some extent. Generally speaking, the cost of either roller is an important factor in the cost of the window shade. In the case of wood rollers the cost depends on the steadily increasing price of wood as the ready supply thereof decreases.

It is a prime object of the present invention to provide a method of making an inexpensive window shade including a roller which obviates the use of the increasingly expensive conventional wooden roller.

Briefly, the invention is concerned with a method of making a window shade having a roller comprising a tough plastic outer tube filled, intermediate its ends, with a compatible, rigid foam plastic core which bonds with the outer tube to provide a rugged and durable body capable of withstanding considerable abuse.

Other objects and advantages of the invention will be pointed out specifically or will become apparent from the following description when it is considered in conjunction with the appended claims and the accompanying drawings, in which:

FIGURE 1 is a partly sectional, side elevational view illustrating a shade formed according to the invention;

FIGURE 2 is an enlarged, partly sectional, end elevational view of the left end of the roller only;

FIGURE 3 is a fragmentary, side elevational view of the left end of the shade roller;

FIGURE 4 is a side elevational view schematically illustrating apparatus which can be used to manufacture shade rollers continuously on a mass production scale according to a process which will be described;

FIGURE 4a is a similar view illustrating a slightly different method which can be used;

FIGURE 5 is a side elevational view indicating a typical timing arrangement which may be employed in the process:

FIGURE 6 is a View illustrating a typical control circuit which can be used; and

FIGURE 7 is a fragmentary, sectional, side elevational view illustrating another embodiment of the roller.

In the drawings, in FIGURE 1, we have illustrated a window shade having a roller generally identified by the letter R which includes a non-cellular, outer tube or sleeve 10 formed of a rigid plastic or other suitable material and filled with a rigid, cellular, foam plastic core 11 which, when suitably cured, is bonded to the tube 10 to form a rigid, unitary body of uniform diameter which will not significantly sag when the load of the shade S in lengths of as much as twelve feet when supported only at its two ends. The conventional cloth or plastic shade S may be fixed to tube 10 at one edge with conventional staples or a suitable adhesive.

It will be seen, from an inspection of FIGURE 1, that the rigid foam core 11 may terminate as at 11a at a spaced res Patent 0 distance from one terminal end of the outer tube 10. Extending within the space 12 thus provided is conventional Winding mechanism such as is described in Patent No. 2,173,791, which comprises a coil spring 13 having an inner end 13a extending into and anchored in a slot 14 provided in the inner end of a spindle 15. The outer end of the spring 13b is secured to a lug 16 extending inwardly from a dish-shaped plate generally indicated by the numeral 16 which is received by the outer tube 10 and anchored thereto in a manner to be described. A spear 17 extends through an opening 17a in the plate 16 to rigidly connect to the spindle 15 and is engageable in a slot-ted window shade bracket in the usual manner to hold the inner end of spring 13 in stationary position when roller R and the dish-shaped plate are revolved during unreeling of the window shade. The dish-shaped plate 16 mounts the usual pivoted pawls 18 which are pivoted to the outer face 16a of the plate 16 as at 18a for engagement with a pawl wheel 19 mounted fast to spear 17 along with a cup-shaped element 19a.

Provided in the end of the outer sleeve member 10 to secure the dish-shaped plate 16 in position for rotation with the sleeve 10, when the latter is revloved in opposition to spring 13, are a pair of diametrically opposite angular slots 20 including axially parallel portions 20a leading from the terminal end of the tube 10 and circumferenti-ally extending portions 20b extending in a direction from the portion 16a opposite to the direction of rotation of the roller R when the latter is revolved in opposition to spring 13. Stated differently, the slot portions 20b extend in the same direction circumferentially as do the conventionally operating pawl fingers 18 from their pivots 18a. It is to be understood that the spear 17 engages in the slotted driving bracket attached to the top of the window frame in the usual manner as shown in the aforementioned patent. Snugly fitting within the slot portions 2% to prevent relative rotation of the end plate 16 and outer core 10 are lugs 21 formed by cutting the peripheral wall 16b of the plate 16 at two diametrically opposite locations in two places, as at 22, and bending the portion thereby isolated radially outwardly. This outwardly bent portion is cut away to form the lug 21 which is reduced in width so that the peripheral length of slot 20b can be kept at a minimum.

In operation, when the shade is pulled downwardly the spear 17 and spindle 15 are prevented from rotating by the slotted bracket in which the spear is engaged. The roller R will rotate in the counterclockwise direction (FIGURE 2) as the shade is being pulled downwardly. This direction of rotation is such that the lugs 21 tend to be retained within the ends of slots 20b, rather than to be separated from them.

At the opposite end of the roller R the rigid foam plastic core also terminates short of the end of the outer sleeve 10, as at 1112. A disk-like plug 22 having a projecting pin 23 is press-fitted in the end of the tube 10, as shown, and is supported for rotation in a bore bearing window shade bracket in the usual manner.

Various materials may be employed as the rigid outer tube 10 and the rigid foam core 11. For instance, the outer sleeve 10 can be a rigid polyvinyl chloride, high density polyethylene, or polypropylene tube, and the core 11 may comprise a light weight, rigid foam such as polyurethane, polyether, or phenolic foam. A suitable polyvinyl chloride tube, which can be termed non-elastomeric in character, employs less than 15% plasticizer by weight and has a Shore durometer A hardness of over 100.

In FIGURE 4 we have illustrated one of several types of apparatus for continuously extruding shade roller bodies in which an outer extrusion housing 24 is connected to a source of molten polyvinyl chloride plastic and, in the usual manner of forcing a plastic from an extrusion orifice 26 with an advancing screw such as at 24a, issues the plastic under pressure in a continuous stream to a powered roller conveyor 27 which has watercooled rollers 27a such as shown in Szantays United States Patent No. 2,791,801 to chill and set the material 25 as it emerges from the orifice 26. Water-cooled jackets 27b are also preferably employed. An inner tube 28, which is connected to a source of plastic incorporat ing a foaming agent activated by heat or the like and similarly may be fed by an advancing screw 28a, has an issuing orifice 29 located at a spaced distance ahead of orifice 26. This orifice 29 issues foam plastic including the expanding agent in a continuous stream. The process contemplates that a suitable resin, hardener, and foaming agent be placed in housing 28 and mixed or that expandable beads which include the blowing agent be placed in chamber 28 and heated in the conventional manner.

Mounted within the tube 28 we can provide a gate valve 30 for closing the tube 28 intermittently as desired. The valve 30, which is circular and closes the tube 28 completely when pivoted to upright position, is mounted on a hinge pin 31 sealably supported by the tube wall 28. A sealed solenoid 32 within the tube 28 is connected by an armature rod 33 with the gate valve 30 and includes a coil 32a which, when energized, operates to move the valve 30 to a position closing the orifice 29 from the supply of material. The solenoid 32 also includes a second coil 32b which, when the first coil 32a is deenergized and coil 32b is energized, will restore the gate valve 30 to the position in which it is shown in FIGURE 4. A cut-off knife 34 vertically arranged to descend between rollers 27 is powered :by a conventional solenoid 34a including coil 34b and passes adjacent the orifice 29 to cut off the tube formed of material 25 when the desired length has been extruded.

In operation, the material 25 can be run continuously, assuming that knife 34 is in the down position in which it is shown in broken lines in FIGURE 4, as soon as knife 34 is withdrawn, which happens relatively instantaneously considering the much slower extrusion rate of the material 25 issuing from orifice 26, a short length of material 25 is allowed to extrude to provide a space for insertion of the plug 22. At this point, coil 32b in solenoid 32 is energized and gate valve 30 is opened so that foam plastic 28a feeds out orifice 29 and substantially immediately expands within the chilled tube wall for-med by material 25. The two materials 25 and 2812 then continuously extrude, the material 25 comprising the outer tube extruding around the core 28a, until it is desired to cut off the flow of foam 28a, as at the surface 111: in FIGURE 1. At this point the coil 32a in solenoid 32 is energized and valve 30 is closed to seal off the source of supply of foam plastic 28a. The closing of gate valve 30 is accomplished sufficiently in advance that the expulsion of any remaining foam plastic material ahead of valve 30, due to the action of the expanding agent therein, will only provide sufficient foam plastic to fill the tube to the extent desired to point 11a. With the supply of foam plastic 28a temporarily cut off, the material 25 continues to be extruded until a proper tube length for the outer tube is extruded, whence knife 34 descends to cut off the sleeve 10. Thus, provision is made for providing a core 11 which terminates short of both ends of the tube 10 the required distance.

Timing cams 35-37, driven from a single, continuously operating electric motor or the like, can be employed to actuate switches 3840, as shown in FIGURE 5, in timed relation. FIGURE 6 illustrates a schematic electrical control diagram wherein the switch 38 is shown operating the gate closing solenoid 32a, the switch 39 operating the gate opening solenoid 32b, and the switch 40 energizing the knife solenoid 34b which is spring returned in the usual manner when solenoid 34b is deenergized.

In another version of the invention, rigid polyviny chloride tubing lengths, already formed and cut to length, are fed in any suitable manner in end-to-end relation over the inner die 28 (FIGURE 4a) and over rollers 27. Except for the fact that no advancing screw 24a, ex-

' trusiorr tube 24, or knife 34 is needed, the operation of the system is the same as previously, the polyvinyl chloride tubing lengths being fed continuously, as was the molen plastic 25. Once the body comprising outer sleeve 10 and foam core 11 is formed, the foam plastic being compatible with the outer tube 10 in the sense that when it cures it bonds to the tubing 10, the slots 20 can be cut in one end and the gear opera-ting mechanism inserted. The plate 16 can be press fitted, then, in the opposite end in the usual manner and the window shade attached with adhesive or in some other suitable manner.

Various plastics can be successfully employed to form the outer member 10 and core 11 as demonstrated by the following examples:

EXAMPLE 1 Exon 4028, which is a high impact, polyvinyl chloride plastic manufactured by Firestone Rubber Company, is used as the outer tube 10 and polyurethane foam 3000A, which forms a tough, rigid foam having excellent dimensional stability (manufactured by the Marblette Corporation, of Long Island City, New York), is employed as the foam material. The temperature of extrusion of the polyurethane foam is room temperature (about 70-80 F.) and the polyvinyl chloride tubing is used in preformed condition according to FIGURE 4a or is extruded according to FIGURE 4. If extruded, it is cooled to rigidity prior to receiving the core plastic. The diameter of the tube 10 wall is A inch and the thickness .020 inch. Four pounds of polyurethane resin is used in combination with 6 pounds of B hardener or accelerator (Marblette). Curing of the foam at F. requires about eight hours and after this time the foam is rigid and bonds to the tube 10, and slots 20 can be cut in the roller body.

- EXAMPLE 2 The same outer sleeve of Exon 4028 was used, except Marblette Corporation, was used with No. 179 hardener or accelerator (Marblette) in the amount of 1 pound hardener to 10 pounds of foam resin and No. 1 101 foam powder (Marblette) in the amount of 1 pound of foam powder to 10 pounds of phenolic resin. A rigid, cellular structure is formed, with expanson of the foam approximately five times original volume, which has high tensile and compressive strength. In the process of preparation, the resin is first intimately mixed with No. 1101 powder and then the accelerator No. 179 is mixed to insure complete blending. Elevated temperature curing requires about eight to ten hours at 140 F. Suchfoam material formed provides a tensile strength of 289 p.s.i., a compressive strength of 780 p.s.i., and has a modulus of rigidity of 22,800 p.s.i.

EXAMPLE 3 The roller of Examples 1 or 2, except that the outer tube 10 is a rigid vinyl chloride-acetate copolymer.

EXAMPLE 4 The roller of Examples 1 or 2, except that the outer tube 10 is a rigid polyethylene extruded as in FIGURE 4.

EXAMPLE 5 The outer tube 10 is extruded from B. F. Goodrich Co. Geon 101 and the core is a rigid, closed cell vinyl foam made from the same Geon paste resin and a conventional blowing agent.

The shade rollers formed in the manner indicated should be capable of withstanding certain minimum weights without materially deforming or fracturing. If rollers in the following diameters are placed on 22 inch centers they should withstand weight applied between the centers as follows:

Diameter of roller: Weight, pounds inch 45 1 inch 48 1 /8 inch 85 1% inch 100 1 /2 inch 130 Other materials which it is believed may be utilized as the outer tube include high molecular weight Teflon (tetrafluoroethylene), polypropylene, Kel F (polychlorotrifluoroethylene), and polystyrene of approximately 60,000 molecular weight. The cellular polymeric material forming the core might, in addition to the foams mentioned, be expandable polystyrene pellets, sold by the Koppers Company, Inc., under the trademark Dylite, unicellular polyvinyl chloride, cellular polyethylene, and Marblette phenolic \foam resin 1200.

Generally speaking, the wall thickness of the outer tubing 10 will be .020 to .040 inch, with tubes ranging from 7 inch in diameter to 3 inches in diameter, although it should be possible to construct shade rollers of lesser or greater diameter in the manner described, if desired. The foam used should form what is known as a rigid nonelastomen'c foam which, when deformed, does not return.

In a modified process a preformed plastic tube 10 of the desired length for the roller, which could be of any plastic mentioned, may be filled With a predetermined quantity of expandable pellets such as Dylite polystyrene pellets. If solid plugs are then very snugly inserted to the depth of surfaces 11a and 11b and the tube is heated, the pellets will expand and form a rigid foam core which bonds to the tube. The roller can then be cured and the plugs later removed.

In FIGURE 7 is shown a modified embodiment of the invention which is exactly as shown in FIGURE 1 with an outer core 10 and a rigid foam plastic core 11. However, an inner, rigid, solid core rod of Fiberglas is provided in the foam core 11 and extends from end to end thereof. This Fiberglas core 42 increases the rigidity of the roller R and is useful in rollers of extremely long length. In another embodiment of the invention the spindle 15 may be formed of the same rigid foam plastic as the core 11.

It is to be understood that the drawings and descriptive matter are in all cases to be interpreted as merely illustrative of the principles of the invention, rather than as limiting the same in any way, since it is contemplated that various changes may be made in the various elements to achieve like results without departing from the spirit of the invention or the scope of the appended claims.

We claim:

1. A method of making a shade comprising the steps of: expanding a foam plastic composition, curable to form a rigid foam, within a rigid tube; curing said foam to form said core; assembling end members including spring re-winding means on the ends of said tube; and attaching a shade to said tube by an end of said shade.

2. A method of making a shade comprising the steps of: expanding a foam plastic in a substantially rigid tube; setting said foam plastic to form a substantially rigid, light weight, cellular core for said tube; assembling shade end plates, including re-wind means, for rotatably supporting said roller; and attaching a shade to said tube.

3. A method of making a shade roller comprising the steps of: extruding a tube of plastic; immediately chilling said tube; simultaneously extruding a mass of foam plastic into said tube and permitting its expansion to form a core therein; assembling shade end members, including spring re-wind means, on the ends of said roller -for rotatably supporting said roller; and attaching a shade to said tube by an end of said shade.

4. A method of making a shade roller comprising the steps of: continuously extruding a tube of plastic; intermittently extruding a mass of foam plastic into said tube to provide a core spaced from the ends of said tube; severing a length of tube; curing the foam plastic to rigidify it; fixing end means for rotatably supporting said roller on the ends thereof; and attaching a shade to said tube by an end of said shade.

5. A method of making a shade comprising the steps of: expanding a foam plastic composition, curable to form a substantially rigid foam, within a substantially rigid tube; curing said foam to form a core for said tube; assembling end support members on said tube; and attaching a shade to said tube by an end of said shade.

6. A method of making a shade comprising the steps of: extruding a plastic outer tube around a core consisting of a foam plastic composition of the character forming a substantially rigid foam to form a shade roller body; assembling end support members on said body; and attaching a shade to said body by an end of said shade.

7. A method of making a shade comprising the steps of: forming a foam plastic core from a composition of the character forming a substantially rigid Ifoam securing an outer tube around said core to form a shade roller body; securing end support members on said body; and attaching a shade to said body by an end of said shade.

8. A method of making a shade comprising the steps of: extruding a plastic outer tube around a 'core to form a shade roller body; assembling end support members on said body; and attaching a shade to said body by an end of said shade.

9. A method of making a shade comprising the steps of: extruding a foam plastic composition, of the character forming a substantially rigid foam, to provide a core; extruding a substantially rigid plastic tube around said composition to form a shade roller body; securing end support members on said body; and attaching a shade to said body by an end of said shade.

References Cited by the Examiner UNITED STATES PATENTS 2,532,867 12/ 1950 Toms 1 60-301 2,791,806 5/1957 Tordella 264171 2,891,614 6/1959 Grupp 1 60301 3,098,286 7/1963 Anderson et al. 29149.5 3,118,800 1/1964 Snelling 264173 X 3,139,826 7/1964 Rainwater 29148.4 X

JOHN 1F. CAMPBELL, Primary Examiner.

THOMAS H. EAGER, Examiner.

Claims (1)

1. A METHOD OF MAKING A SHADE COMPRISING THE STEPS OF: EXPANDING A FOAM PLASTIC COMPOSITION, CURABLE TO FORM A RIGID FOAM, WITHIN A RIGID TUBE; CURING SAID FOAM TO FORM SAID CORE; ASSEMBLING END MEMBERS INCLUDING SPRING RE-WINDING MEANS ON THE ENDS OF SAID TUBE; AND ATTACHING A SHADE TO SAID TUBE BY AN END OF SAID SHADE.

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