End separated pocketed mattress as well as method and device for manufacturing the same

1. A spring mattress, comprising:

a plurality of strings interconnected side by side, each string including a plurality of continuous casings and, enclosed therein, coil springs, casing portions arranged at the ends of the spring being moved towards each other, through the spring, and interconnected by at least one connecting device, said springs being biased within the casings, wherein, between at least some of the springs, in at least one of the strings, at least two slots are arranged between the springs, opening both towards the upper and lower side of the mattress.

2. A spring mattress as claimed in claim 1 , wherein the at least two slots are arranged between substantially all springs in at least one of the strings.

3. A spring mattress as claimed in claim 1 , wherein the springs between which the at least two slots are arranged are separated with an intermediate separation distance, which separation distance exceeds about 10% of the diameter of the largest turn of the adjoining springs.

4. A spring mattress as claimed in claim 3 , wherein the separation distance is provided by a connection, extended in the longitudinal direction of the strings, of the casing material between the springs, the at least two slots being arranged in said extended connection.

5. A spring mattress as claimed in claim 3 , wherein the separation distance is provided by two separated joint lines arranged between the springs, the at least two slots being arranged between said joint lines.

6. A spring mattress as claimed in claim 1 , wherein the casing is a textile material.

7. A spring mattress as claimed in claim 1 , wherein the casing portions are moved so far towards each other as to make contact with each other.

8. A spring mattress as claimed in claim 7 , wherein the at least one connecting device includes at least one of a mechanical connecting element and a surface joint.

9. A spring mattress as claimed in claim 1 , wherein the springs between which the at least two slots are arranged are separated with an intermediate separation distance, which separation distance exceeds 15% of the diameter of the largest turn of the adjoining springs.

10. A spring mattress as claimed in claim 1 , wherein the springs between which the at least two slots are arranged are separated with an intermediate separation distance, which separation distance exceeds about 20% of the diameter of the largest turn of the adjoining springs.

11. A method for manufacturing a spring mattress, comprising:

enclosing springs in casings in continuous strings;

interconnecting the strings side by side;

biasing at least one of the springs by moving casing portions arranged for the ends of the spring towards each other and interconnecting the springs by connecting elements;

and, before or after the preceding steps,

arranging at least two slots between at least some of the springs in at least one of the strings, said at least two slots open toward the upper and lower side of the mattress.

12. A method as claimed in claim 11 , wherein at least some of the adjoining springs within a string, between which the at least two slots are arranged, are further arranged with an intermediate separation distance between the springs, said separation distance exceeding about 10% of the diameter of the largest turn of the adjoining springs.

13. A method as claimed in claim 12 , wherein the casing portions are moved so far towards each other as to make contact with each other.

14. A method as claimed in claim 11 , wherein the casing portions are moved so far towards each other as to make contact with each other.

15. A method as claimed in claim 11 , wherein the at least two slots are arranged before the biasing of the springs.

16. A method as claimed in claim 11 , wherein the separation of the springs is provided by arranging an interconnection, extended in the longitudinal direction of the strings, of the casing material, the at least two slots being arranged in said extended interconnection.

17. A method as claimed in claim 11 , wherein the separation is provided by arranging two separated joint lines, the at least two slots being arranged between said joint lines.

18. A method as claimed in claim 11 , wherein at least some of the adjoining springs within a string, between which at least two slots are arranged, are further arranged with an intermediate separation distance between the springs, said separation distance exceeding about 15% of the diameter of the largest turn of the adjoining springs.

19. A method as claimed in claim 11 , wherein at least some of the adjoining springs within a string, between which at least two slots are arranged, are further arranged with an intermediate separation distance between the springs, said separation distance exceeding about 20% of the diameter of the largest turn of the adjoining springs.

20. A device for manufacturing spring mattresses, comprising:

means for enclosing coil springs in continuous casings to form strings;

means for interconnecting the strings side by side;

means for biasing the springs enclosed in the strings; and

means for arranging at least two slots between springs in such strings, said at least two slots being open toward the upper and lower sides of the mattress.

21. A device as claimed in claim 20 , wherein the means for biasing comprises at least one insertion device and, arranged at a distance therefrom, an oppositely extending device, the insertion device and the oppositely extending device being adapted to perform a relative displacement motion towards and away from each other to move casing materials, at the ends of a spring arranged therebetween, towards each other through the spring, and fixing means for arranging connecting elements which interconnect the thus moved together casing materials from the two ends of the spring.