SPRING-TYPE MATTRESS WITH A BUILT-IN POCKET, METHOD OF MAKING SUCH SPRING-TYPE POCKET MATTRESS AND APPARATUS FOR PRETENSIONING HELICAL MATTRESS SPRINGS PLACED IN MATTRESS POCKETS

摘要

The present invention relates to a spring mattress comprising springs enclosed in casings, a so-called pocket mattress, and a method and a device for manufacturing such a mattress. The spring mattress according to the invention comprises a plurality of interconnected coil springs (1) enclosed in casings (2), for at least one of the springs, the casing portions arranged at the spring ends being moved towards each other, through the spring, and interconnected with the aid of connecting means.