Coated springs and mattress made thereof
View Patent ↗The invention describes a coated spring for mattresses that comprises a helical compression spring and a wrapping in the form of a bag containing the spring, wherein the bag containing the spring is injected with a polymeric reaction mixture, which after reacting or curing produces a polymeric foam, preferably of flexible polyurethane up to a desired volume in order to cause the spring to change its flexion or compression properties, as well as the method for its manufacturing and its use in the manufacturing of mattresses of different kinds.
1. A method for manufacturing coated springs for mattresses comprising:
coating a helical spring in a material hermetic to liquids such that the helical spring is contained in a bag;
forming a row of a plurality of the bags, each bag containing a respective helical spring, through connection lines transversal to the longitudinal joint direction, and parallel to the height of the helical springs;
injecting a predetermined amount of polymeric reaction mixture in the bottom of each bag containing the respective helical spring; and
allowing the polymeric reaction mixture to fully react to generate a flexible foam inside each of the bags, such that a portion of each helical spring is encrusted in the flexible foam.
2. The method for manufacturing coated springs for mattresses of claim 1 , wherein the material hermetic to liquids is a textile material, a non-woven fabric, or a polymeric material that is hermetic to the polymeric reaction mixture.
3. The method for manufacturing coated springs for mattresses of claim 1 , wherein the connection lines between each of the bags containing the helical springs are produced either through ultrasonic welding or gluing, staples, Velcro straps or any other suitable manner, and wherein the connection lines are arranged to provide a hermetic delimitation between the bags containing the helical springs.
4. The method for manufacturing coated springs for mattresses of claim 1 , wherein the polymeric reaction mixture is previously dosed in order to inject the predetermined amount into each of the bags in order to obtain flexible foam with a predetermined height that will depend on the predetermined amount of injected polymeric reaction mixture.
5. The method for manufacturing coated springs for mattresses of claim 1 , wherein the polymeric reaction mixture is any mixture of polymeric materials that form a flexible foam.
6. The method for manufacturing coated springs for mattresses of claim 1 , wherein the density of the flexible foam may vary, by varying the proportion of water contained in the polymeric reaction mixture, depending on the needs of the manufactured coated springs.
7. A method for manufacturing coated springs for mattresses comprising:
coating a helical spring in a material hermetic to liquids such that the helical spring is contained in a bag;
injecting a predetermined amount of polymeric reaction mixture into the bag containing the helical spring; and
allowing the polymeric reaction mixture to fully react to generate a foam inside the bag.
8. The method for manufacturing coated springs for mattresses of claim 7 , wherein the material hermetic to liquids is a textile material, a non-woven fabric, or a polymeric material that is hermetic to the polymeric reaction mixture.
9. The method for manufacturing coated springs for mattresses of claim 7 , further comprising joining a plurality of bags containing helical springs into a row.
10. The method for manufacturing coated springs for mattresses of claim 9 , wherein connection lines between each of the bags containing the helical springs in the row are produced either through ultrasonic welding or gluing, staples, Velcro straps or any other suitable manner, and wherein the connection lines are arranged to provide a hermetic delimitation between the bags containing the helical springs.
11. The method for manufacturing coated springs for mattresses of claim 7 , wherein the polymeric reaction mixture is previously dosed in order to inject the predetermined amount into the bag in order to obtain foam with a predetermined height that will depend on the predetermined amount of injected polymeric reaction mixture.
12. The method for manufacturing coated springs for mattresses of claim 7 , wherein the polymeric reaction mixture is any mixture of polymeric materials that form a foam.
13. The method for manufacturing coated springs for mattresses of claim 7 , wherein the density of the foam may vary, by varying the proportion of water contained in the polymeric reaction mixture, depending on the needs of the manufactured coated springs.
14. A method for manufacturing coated springs for mattresses comprising:
forming a row of a plurality of bags, each bag containing a respective helical spring, through connection lines transversal to the longitudinal joint direction, and parallel to the height of the helical springs;
injecting a predetermined amount of polymeric reaction mixture into each of the plurality of bags containing the respective helical spring; and
allowing the polymeric reaction mixture to fully react to generate a foam inside each of the plurality of bags.
15. The method for manufacturing coated springs for mattresses of claim 14 , wherein each bag is made of a material hermetic to liquids.
16. The method for manufacturing coated springs for mattresses of claim 15 , wherein the material hermetic to liquids is a textile material, a non-woven fabric, or a polymeric material that is hermetic to the polymeric reaction mixture.
17. The method for manufacturing coated springs for mattresses of claim 14 , wherein the polymeric reaction mixture is previously dosed in order to inject the predetermined amount into each of the plurality of bags in order to obtain foam with a predetermined height that will depend on the predetermined amount of injected polymeric reaction mixture.
18. The method for manufacturing coated springs for mattresses of claim 14 , wherein the polymeric reaction mixture is any mixture of polymeric materials that form a foam.
19. The method for manufacturing coated springs for mattresses of claim 14 , wherein the density of the foam may vary, by varying the proportion of water contained in the polymeric reaction mixture, depending on the needs of the manufactured coated springs.
20. The method for manufacturing coated springs for mattresses of claim 14 , wherein the connection lines are arranged to provide a hermetic delimitation between each of the plurality of bags containing the helical springs.