Foam furniture molded around a hollow shell of hard plastic

Patent metadata

Field	Value
Publication number	US-10271657-B2
Application number	US-201615224667-A
Country	US
Kind code	B2
Filing date	Aug 1, 2016
Priority date	Nov 29, 2013
Publication date	Apr 30, 2019
Grant date	Apr 30, 2019

Abstract

A foam seating article includes a layer of molded foam surrounding a hollow shell made of hard plastic. A fabric covering encloses the shell and molded foam. The foam seating article can take the form of a chair, stool, sofa, chaise lounge, bench or Ottoman. The hollow shell can be formed using blow molding, injection molding or by capping both ends of a tube with disks. Air pressure inside the airtight hollow shell prevents the shell from collapsing inwards under the weight of an occupant. Alternatively, the hollow shell of the seating article can be accessed through a removable lid. The seating article includes no wood or metal. The layer of molded foam includes sections of different foam types, such as high density (HD) foam, memory foam and latex foam. Molding foam around a hard plastic shell is simpler and less costly than making conventional metal or wood framed furniture.

First claim

What is claimed is:

1. A method of making a cushioned seating article, comprising:
forming a hollow shell of hard plastic using blow molding, wherein the hollow shell completely encloses a hollow cavity, and wherein the hollow shell has an outer surface;
placing the shell in a mold;
molding a layer of foam completely around the hollow shell such that the entire outer surface of the hollow shell is covered by the molded foam, wherein the molded foam has an indentation load deflection of twenty or less; and
placing a covering around the molded foam and the shell.

2. The method of claim 1 , wherein the shell is made of a plastic taken from the group consisting of: polypropylene, polyethylene, polyvinyl chloride, polyvinyl acetate and a thermoplastic elastomer.

3. The method of claim 1 , wherein the foam is taken from the group consisting of: high density (HD) foam, memory foam and latex.

4. The method of claim 1 , wherein the forming the hollow shell involves sealing a sheet of flexible resin in a mold, blowing air into the sheet such that the sheet takes the shape of the interior of the mold, and curing the sheet.

5. The method of claim 1 , wherein the covering is taken from the group consisting of: a woven fabric, a nonwoven fabric and leather.

6. The method of claim 1 , wherein the hollow shell is polypropylene with a thickness of three millimeters or less.

7. The method of claim 1 , wherein the cushioned seating article includes no wood or metal.

8. The method of claim 1 , wherein the layer of foam includes sections of different foam types.

9. The method of claim 1 , wherein the outer surface of the hollow shell is uneven and has dimples, and wherein the molded foam is molded into the uneven outer surface.

10. The method of claim 1 , wherein the hollow shell is a tube that is capped at both ends.

11. A method of making a cushioned seating article, comprising:
forming a hollow shell of hard plastic using blow molding, wherein the hollow shell completely encloses a hollow cavity, wherein the hollow shell is airtight, and wherein the hollow shell has an outer surface;
placing the shell in a mold;
molding a layer of foam completely around the hollow shell such that the entire outer surface of the hollow shell is covered by the molded foam, wherein the molded foam has an indentation load deflection of twenty or less; and
placing a covering around the molded foam and the shell.

12. A method comprising:
forming a hollow shell of hard plastic, wherein the hollow shell completely encloses a hollow cavity, and wherein the hollow shell has an outer surface;
placing the shell in a mold;
molding a layer of foam completely around the hollow shell such that the entire outer surface of the hollow shell is covered by the molded foam, wherein the molded foam has hardness of less than 20 Shore A; and
placing a covering around the molded foam and the hollow shell.

13. The method of claim 12 , wherein the molded foam has an indentation load deflection of twenty or less.

14. The method of claim 12 , wherein the hollow shell is polypropylene with a thickness of three millimeters or less.

15. The method of claim 12 , wherein the hollow shell is airtight.

16. The method of claim 12 , wherein the molded foam is memory foam.

17. The method of claim 12 , wherein the forming the hollow shell involves sealing a sheet of flexible resin in a mold, blowing air into the sheet such that the sheet takes a shape of an interior of the mold, and curing the sheet.

18. The method of claim 12 , wherein the covering is taken from the group consisting of: a woven fabric, a nonwoven fabric and leather.

19. The method of claim 12 , wherein the layer of foam includes sections of different foam types.

20. The method of claim 12 , wherein the outer surface of the hollow shell is uneven and has dimples, and wherein the molded foam is molded into the uneven outer surface.

Assignees

• Zinus Inc

Inventors

• Lee Youn Jae

Classifications

• B29C49/0047

  Operations & Transport · mapped topic

• B29D99/0092

  Producing upholstery articles, e.g. cushions, seats (B29C63/025 takes precedence) · CPC title

• B29C44/08

  using several expanding {or moulding} steps · CPC title

• B29K2105/04

  cellular or porous · CPC title

• B29K2313/00

  Use of textile products or fabrics as reinforcement (B29K2105/06 takes precedence) · CPC title