Spring core having a fully active spring and method of manufacturing the same

摘要

A pocket spring core for a bedding or seating cushion comprises an array of pocket springs. The array of pocket springs comprises fully active springs (10) respectively enclosed in an associated pocket (35) of fabric. Each fully active spring (10) respectively has a central spiral portion (20) with at least one turn and defining a spring axis (13), an unknotted first end turn (21) defining a first end of the fully active spring (10), and an unknotted second end turn (22) defining an opposing second end of the fully active spring (10). Each fully active spring (10) has a rest shape in which the first end turn (21) and the second end turn (22) have a finite pitch angle, so that the first end turn (21) and the second end turn (22) contribute to a spring force of the fully active spring (10).

主权项

1. A method of manufacturing a pocket spring core for a bedding or seating cushion, said method comprising:
providing a plurality of springs, each spring being made of a single piece of wire, and enclosing each spring of said plurality of springs in respectively an associated pocket to form a string of pocket springs, wherein said plurality of springs comprises fully active springs, each fully active spring respectively having a central spiral portion with at least one turn, an unknotted first end turn, and an unknotted second end turn, the first end turn defining a first end of the fully active spring and the second end turn defining an opposing second end of the fully active spring, wherein said central spiral portion defines a spring axis, and wherein each fully active spring is configured such that, in an uncompressed state and when the fully active spring is not enclosed in the associated pocket, the first end turn and the second end turn have a finite pitch angle which is greater than the pitch angle when the fully active spring is enclosed in the associated pocket, so that the first end turn and the second end turn contribute to a spring force of the fully active spring.