Pad spring device

1. A pad spring device for seat-cushions, upholstered cushions or mattresses, comprising:

a plurality of adjacent pad spring elements, wherein the pad spring elements are connected to each other by means of a flexible coupling unit for forming a common unit;

wherein each pad spring element being formed by a first spring part and a second spring part;

wherein a coupling unit that connects the pad spring elements to each other for forming a common unit is positioned between the first and the second spring part of each pad spring;

wherein both the first spring part and the second spring part includes a spring body and a supporting plate;

wherein said spring body and said supporting plate are formed integrally of plastic; and

wherein the coupling unit is formed like a mat and wherein the pad spring elements are sewed to the coupling unit.

2. A pad element, in particular upholstered cushions, mattresses or the like, characterized by a pad spring device according to claim 1 .

3. A pad element according to claim 2 , wherein the receiver is formed by a first and a second cover as well as an interposed annular part.

4. A pad element according to claim 3 , wherein the annular part is made of two pieces.

5. A pad element according to claim 4 , wherein side borders of the coupling unit are placed between the two pieces of the annular part.

6. A pad spring element according to claim 5 , wherein the first and second cover of the receiver and the annular part form an enclosure having an internal volume space;

wherein the coupling unit comprises a substantially air-impermeable thermofilm;

wherein said volume space includes a first air chamber formed on one side of the coupling unit between the coupling unit and the first cover and a separate second air chamber formed between an opposite side of the coupling unit and the second cover; and

wherein one of said first and second spring parts is positioned in the first air chamber and the other of said first and second spring parts is positioned in the second air chamber.

7. A pad element according to claim 2 , comprising a receiver that is preferably made at least partly of foamed material for the pad spring device.

8. A pad element according to claim 2 , wherein the coupling unit of the pad spring device is fixed with respect to said receiver.

9. The pad spring device of claim 1 , wherein the coupling unit is placed between the first and second spring parts such that one of the first and second spring parts is above the above the coupling unit and the other of the first and second spring parts is below the coupling unit and said supporting plates of the first and second spring parts are each in spaced relation to said coupling unit.

10. The pad spring device of claim 9 , wherein the first and second spring parts each include a bore configured to receive a thread for sewing the first and second spring parts to the coupling unit.

11. The pad spring device of claim 9 , wherein the first and second spring parts are sewn to each other and the coupling device.

12. A pad spring device according to claim 1 , wherein the spring body conically tapers from the supporting plate.

13. A pad spring device according to claim 1 , wherein the spring body at least comprises one helical spring arm.

14. A pad spring device according to claim 1 , wherein the coupling unit is made of plastic or a plastic coated mat.

15. A bed, in particular a sick-bed and/or care bed, characterized by a pad spring device according to claim 1 .