US3068138A

US3068138A - Method of molding cushions

Info

Publication number: US3068138A
Application number: US837275A
Authority: US
Inventors: Friedman Alex
Original assignee: Individual
Current assignee: Individual
Priority date: 1959-08-31
Filing date: 1959-08-31
Publication date: 1962-12-11
Anticipated expiration: 1979-12-11

Description

Doc. 11, 1962 A. FRIEDMAN METHOD OF MOLDING CUSHIONS Filed Aug. 31, 1959 l INVENTOR- ALEX FRIEDMAN United States PatehtO 3,068,138 METHOD OF MOLDING CUSHIONS Alex Friedman, Brooklyn, NY. Filed Aug. 31, 1959, Ser. No. 837,275 4 Claims. (Cl. 156-212) The present invention is directed to a method of producing seats for chairs, settees and the like and more particularly to a molding operation for this purpose.

In the past, it has been customary in the production of such upholstered seats to provide a board or the like, place padding thereon, cover the padding with an upholstery fabric, then nail the edges of the fabric to the board. In so doing, the operator placed tension on the fabric by hand and drove in a nail to hold it in place, and repeated the operation until the fabric was secured all around the padding. This had a number of disadvantages in that the operation was slow and required a highly skilled mechanic. Because the fabric was held down at spaced points, the stress induced in the fabric when the chair was in use was concentrated at the nails resulting in accidental tearing of the fabric. The tension applied during the fabrication was not uniform so that the padding was in some cases not uniformly held causing lumps to form after some use, and it accentuated the tendency to tearing of the fabric at the nail bobs.

The present invention is intended and adapted to overcome the difficulties and disadvantages inherent in the making of seats and the like as described above, it being among the objects of the invention to devise a process which is rapid, effective and economical in the production thereof.

It is also among the objects of the invention to produce a seat of the character described which is uniform in the distribution of the padding and which will not become lumpy or distorted even after long usage.

It is further among the objects of the invention to provide a process, and a product thereof, which includes the molding together of the several elements, and is a simple one-step operation which can be used to give the desired results time after time.

in practicing the invention, there is first formed a base of fibrous material, such as paper pulp, which is molded under pressure to form a solid body. While this is the preferred form of base, other equivalent bases may be used. The base has a rim of substantial depth which may be in the form of a flange. The base is placed on a bottom die in a molding press, the padding is cut to the proper size and shape to fit onto the horizontal portion of the base and is placed thereon. A suitable thermoplastic or thermosetting adhesive is applied to the periphery of the base. The cover fabric is cut to the proper size and shape, and the portion of the under side thereof which is to eventually contact the flange or rim of the base, is also provided with a film of the same adhesive. A top die is provided which has 21 depending flange adapted to contact the edges of the fabric as the die descends, pull it tight with uniform tension all around, then force the edges into contact with the flange of the base. Since the flange of the top die is heated, and also the flange of the bottom die if desired, the adhesive is activated and forms a permanent bond which holds the several elements together in their predetermined relative positions without danger of accidental displacement.

The invention is more fully described in connection with the accompanying drawing, in which like reference characters indicate like parts.

FIG. 1 is a vertical cross-sectional view taken through a mold, showing the several elements in place prior to the molding;

FIG. 2 is a view similar to FIG. 1 showing the mold in closed position; and

ice

FIG. 3 is a perspective view of the assembly as shown in FIG. 2 with parts broken away for clearness.

The drawing shows the making of a circular seat, but the invention is not limited thereto. The bottom die 1 has a shoulder 2 along the lower part of its periphery forming a horizontal extension 4. There is provided a fiber board 5 having a depending flange 6; itmay be formed on bottom die 1 and a suitable top die or in any other suitable manner. Suitable padding 7, which is preferably of foam rubber, is placed on fiber board 5, the padding tapering toward its edges 8. A piece of fabric 9 of circular form and of suflicient diameter to fit over the flange 6 of the board is laid on top of the padding 7. As shown by the arrows 10 of FIG. 1, the lower edges of the fabric extend outwardly of the fiber board.

An adhesive 11 in the form of a thin film is applied to the surface of flange 6. Any suitable adhesive responsive to heat and pressure to form a permanent bond may be used, such as a thermosetting synthetic or natural rubber latex, or a thermoplastic adhesive, such as polyethylene or a polyvinyl acetate-chloride. A similar film of said adhesive 12 is placed on fabric 9. Then the adhesive may be dried or it may be applied and dried prior to the assembly in the mold.

The top mold consists of an arched portion 13 with a depending flange 14 and a rounded lower edge 15. A cover 16 is spaced from the top mold and has afiange 17 spaced from flange 14. An inturned rim 18 is secured to the lower edge of flange 14 to enclose electric heating element 19.

In the operation, fiber board 5 is formed on lower die 1 by a usual molding procedure or is produced elsewhere and placed on said lower die. Foam rubber 7 of the desired consistency, size and shape is placed on board 5 which already has adhesive 11 thereon. Cover 9 having adhesive 12 along the inner edge is placed on foam rubber 7. Heated die 13 is lowered so that rounded corner 15 engages the edge of fabric 9 forcing it down to tighten against the foam rubber and then inward to make contact between

adhesive films

11 and 12. The heat and pressure cause adherence therebetween and the completion of the seat in a one-step operation.

Although the invention has been described setting forth a single embodiment thereof, the invention is not limited to the details shown and described. For instance, seats of shapes other than round may be replaced by other materials, such as wood, and may be made differently. The dies may be different in construction than as shown and other heating means may be used. Various suitable materials may be used as, for example, the board need not be solid or the combination of board and padding may be constructed of a frame, springs and padding materials of any suitable kind. These and other changes may be made in the details, and the invention is to be broadly construed and to be 1' "ted only by the claims appended hereto.

l. A method of making seat cushions by a molding operation which comprises- (1) forming a rigid base of substantially flat surface having an integral rigid rim depending at about a right angle therefrom;

(2) placing said base on the lower of the members of a two-part mold to support both base and rim against pressure, said lower member being entirely below said base and rim, said lower member having an uninterrupted fiat upper surface and depending sides at said right angle to said surface;

(3) placing padding having a convex upper face on said base to cover only said flat surface;

(4) covering said padding with a fabric the edges of said fabric extending beyond the edges of said base and over said rims;

(5) introducing a heat activatable adhesive onto at least one of said rim and extending part of said fabric;

of the convex paddmg to hold the fabric smoothly on said padding;

(7) then moving the extending part of said fabric downwardly and inwardly into pressure contact with said sides, said complementary part having an uninterrupted lower contact surface of the same contour and size as the upper convex face of said cushion, and

(8) heating said mold to activate said adhesive and heat seal said rim to said fabric against said sides and characterized in said base and rim, said lower member having an uninterrupted upper surface and depending sides at said right angle to said surface;

(3) placing padding having an upper face tapering to the edge of said base to cover only said surface; (4) covering said padding with a fabric the edges of said fabric extending beyond the edges of said base and over said rims;

(5) introducing an activatable adhesive onto at least one of said rim and extending part of said fabric;

and (8) pressing the edges of said mold parts together 'd adhesive to seal said rim to said fabric against said sides and to produce a cushion having a rigid base integrally molded thereto.

References Cited in the file of this patent UNITED STATES PATENTS 2,300,380 Faulhaber Oct. 27, 1942 2,389,934 Rothenberg et al Nov. 27, 1945 2,461,881 Diamond Feb. 15, 1949 2,620,854 Wetherell Dec. 9, 1952 2,672,176 Lyijynen Mar. 16, 1954 2,797,179 Reynolds et al. June 25, 1957 3,012,926 Wintermute et a1 Dec. 12, 1961

Claims

1. A METHOD OF MAKING SEAT CUSHIONS BY A MOLDING OPERATION WHICH COMPRISES(1) FORMING A RIGID BASE OAF SUBSTANTIALLY FLAT SURFACE HAVING AN INTEGRAL RIGID RIM DEPENDING AT ABOUT A RIGHT ANGLE THEREFROM; (2) PLACING SAID BASE ON THE LOWER OF THE MEMBERS OF A TWO-PART MOLD TO SUPPORT BOTH BASE AND RIM AGAINST PRESSURE, SAID LOWER MEMBER BEING ENTIRELY BELOW SAID BASE AND RIM, SAID LOWER MEMBER HAVING AN UNINTERRUPTED FLAT UPPER SURFACE AND DEPENDING SIDES AT SAID RIGHT ANGLE TO SAID SURFACE; (3) PLACING PADDING HAVING A CONVEX UPPER FACE ON SAID BASE TO COVER ONLY SAID FLAT SURFACE; (4) COVERING SAID PADDING WITH A FABRIC THE EDGES OF SAID FABRIC EXTENDING BEYOND THE EDGES OF SAID BASE AND OVER SAIDD RIMS; (5) INTRODUCING A HEAT ACTIVATABLE ADHESIVE ONTO AT LEAST ONE OF SAID RIM AND EXTENDING PART OF SAID FABRIC; (6) MOVING SAID COMPLEMENTARY PART OF SAID MOLD ONTO SAID FABRIC TO CONTACT THE EDGES OF SAID FABRIC AND PULL IT TIGHT AND TO PRESS UNIFORMLY ON THE AREA OF THE CONVEX PADDING TO HOLD THE FABRIC SMOOTHYL ON SAID PADDING; (7) THEN MOVING THE EXTENDING PART OF SAID FABRIC DOWNWARDLY AND INWARDLY INTO PRESSURE CONTACT WITH SAID SIDES, SAID COMPLEMENTARY PART HAVING AN UNINTERRUPTED LOWER CONTACT SURFACE OF TTHE SAME CONTOUR AND SIZE AS THE UPPER CONVEX FACE OF SAID CUSHION, AND (8) HEATING SAID MOLD TO ACTIVATE SAID ADHESIVE AND HEAT SEAL SAID RIM TO SAID FABRIC AGAINST SAID SIDES AND TO PRODUCE A CUSHION HAVING A RIGID BASE INTEGRALLY MOLDED THERETO.