Spring core

Patent metadata

Field	Value
Publication number	US-11717092-B2
Application number	US-202217714809-A
Country	US
Kind code	B2
Filing date	Apr 6, 2022
Priority date	Nov 9, 2017
Publication date	Aug 8, 2023
Grant date	Aug 8, 2023

Abstract

The present invention concerns a spring core (1, 1a, 12, 13, 17, 18) that may be used in e.g. bed mattresses, chairs or sofas. The spring core (1, 1a, 12, 13, 17, 18) comprises springs placed inside pocket (3). The pockets (3) are placed in a number of rows, which rows of pockets (3) are placed side by side. The spring core (1, 1a, 12, 13, 17, 18) is held in a compressed state by means of at least one cord (5). The at least one cord (5) is formed into braids (6) at opposite outer ends (7) of each row of pockets (3). Further, the at least one cord (4) forms a number of loops (8) on at least one side of each row of pockets (3). By pulling at one free end (10) of the at least one cord (5) the braids (6) and loops (8) are dissolved, allowing the spring core (1) to return to the non-compressed state.

First claim

The invention claimed is:

1. A spring core, comprising springs placed inside pockets, which pockets are placed in a number of rows, which rows of pockets are placed side by side, wherein the spring core is held in a compressed state by means of at least one cord passing through the pockets in a form of a number of interconnected loops, wherein to form an interconnected loop, the at least one cord goes up through an opening in one of the pockets, goes through a previously formed interconnected loop and back down through the same opening.

2. The spring core of claim 1 , wherein the at least one cord passes through holes in the pockets in such a way that the at least one cord forms the number of interconnected loops on at least one side of each row of pockets.

3. The spring core of claim 2 , wherein the interconnected loops are formed by means of chain stitches.

4. The spring core of claim 3 , wherein the at least one cord is formed into a braid at opposite outer ends of each row of pockets.

5. The spring core of claim 4 , wherein the at least one cord forming the interconnected loops are held in tension between the braids.

6. The spring core of claim 1 , wherein the springs are conical and compressed in such a way that an upper turn of each spring passes an associated lowest turn of the spring.

7. The spring core of claim 6 , wherein the cord is arranged in between the upper and lowermost turns of the compressed springs.

8. The spring core of claim 7 , wherein the cord is a steel wire.

9. The spring core of claim 1 , wherein the spring core comprises deck fabrics placed on opposite sides of the spring core.

10. The spring core of claim 1 , wherein the spring core comprises a ticking and wherein the rows of pockets of the spring core are placed inside the ticking.

11. The spring core 1 , wherein the at least one cord ( 5 ) is formed in such a way that responsive to pulling at a free end of the at least one cord, the springs inside the pockets of the rows of pockets return to a non-compressed state.

12. The spring core of claim 1 , wherein the spring core is held in the compressed state by means of one single cord.

13. The spring core of claim 1 , wherein one cord is arranged for each row of pockets of the spring core.

14. A method of compressing a spring core of a pocket spring mattress, which spring core comprises springs placed inside pockets, which pockets are placed in rows side by side, wherein the springs inside the pockets are compressed, and wherein the method comprises keeping the springs inside the pockets in a compressed state by means of at least one cord passing through the pockets in a form of a number of interconnected loops, wherein to form an interconnected loop, the at least one cord goes up through an opening in one of the pockets, goes through a previously formed interconnected loop and back down through the same opening.

15. The method of claim 14 , wherein the springs are allowed to rebound by pulling out the at least one cord, which at least one cord is pulled out by pulling at a free end of the at least one cord.

16. The method of claim 14 , wherein the at least one cord is applied in form of single-thread sewing.

17. The method of claim 14 , wherein at least two cords are applied in form of double-thread sewing.

18. The method of claim 14 , wherein the springs are compressed in such a way that an upper turn of each spring passes a lowermost turn of the spring and wherein the at least one cord is inserted through the pockets and between the upper turn and the lowermost turn of each spring to keep the spring core in a compressed state.

19. The method of claim 18 , wherein the at least one cord is a steel wire.

Assignees

• Ikea Supply Ag

Inventors

• Bergner Anders
• Tan Zhiming

Classifications

• A47C23/043 Primary

  using wound springs · CPC title

• F16F3/04

  composed only of wound springs · CPC title

• F16F2226/04

  Assembly or fixing methods; methods to form or fashion parts · CPC title

• F16F2236/045

  the spring material being generally enclosed · CPC title

• A47C27/064 Primary

  Pocketed springs · CPC title