Method for producing stuffing for a spring-type mattress

A method for producing stuffing to form a spring-type mattress assembly including at least one spring member utilizing upper and lower mold members, which comprises:

• forming grooves along the entire circumferential edge portions of said upper and lower mold member;
• fixing a dense seat member on a flat surface of said lower mold member and a relatively less dense seat member on a flat surface of said upper mold member;
• bending edge portions of each of said seat members into said grooves of said upper and lower mold members;
• inserting and fixing elastic plates within said grooves of said upper and lower mold members;
• pouring a predetermined quantity of an undiluted solution of plastics to be foamed onto said flat surface of said lower mold;
• tightly contacting said upper and lower mold members together for therein expanding and forming said undiluted solution of plastics into a resulting mass, thereby forming a stuffing member integrally composed of said resulting mass, each of said seat members and said plates;
• horizontally and symmetrically cutting and dividing said stuffing member into a first part and a second comparatively hard part;
• turning said first and second parts of said stuffing member over and assembling them so as to engage respective elastic plates of said first and second parts and cover said at least one spring;
• and
• covering said two parts of said stuffing member by an outer decorative member to form said mattress assembly.