Pre-stressed molded foam cushioning element

• US 3,161,436 A
• Filed: 03/27/1962
• Issued: 12/15/1964
• Est. Priority Date: 03/27/1962
• Status: Expired due to Term

• Current Assignee: Davidson & Gribbell LLP
• Original Assignee: Bruce G. Hood
• Inventors: Hood, Bruce G.
• Application Number:
  US04/183,343
• Time in Patent Office: 994 Days
• US Class Current: 297/452.27
• CPC Class Codes: A47C 27/146 on the outside surface of the mattress or cushion
• CPC Class Codes: A47C 27/16 reinforced with sheet-like or rigid elements, e.g. profiled
• CPC Class Codes: B29C 44/0461 by having different chemical compositions in different places, e.g. having different concentrations of foaming agent, feeding one composition after the other
• CPC Class Codes: B29C 44/12 Incorporating or moulding on preformed parts, e.g. inserts or reinforcements
• CPC Class Codes: B60N 2/7094 Upholstery springs
• CPC Class Codes: Y10S 297/01 Foam
• CPC Class Codes: Y10S 297/02 Molded

Claims

1. A MOLDED ARTICLE COMPRISING;

A SUBSTANTIALLY RIGID BASE MEMBER;

A SUBSTANTIALLY FLEXIBLE NON-STRETCHABLE SKIN MEMBER OVERLYING AND SPACED FROM SAID BASE MEMBER AND DEFINING A CUSHION RECEIVING AVITY BETWEEN SAID SKIN AND SAID BASE;

SAID SKIN MEMBER HAVING A PRESSURE AND WEAR RECEIVING SURFACE;

A FIRST RESILIENT CUSHIONING ELEMENT IN SAID CAVITY HAVING AN OUTER SURFACE COMPRISED IN PART OF AT LEAST ONE PRE-STRESS PRESSURE RECEIVING SURFACE, SAID FIRST CUSHIONING ELEMENT FILLING ONLY A PORTION OF SAID CAVITY WITH SAID OUTER SURFACES OTHER THAN SAID PRE-STRESS PRESSURE RECEIVING SURFACE IN CONTACT WITH SAID SKIN, SAID SKIN BEING FREE FROM ADHESION TO SAID OUTER SURFACES OF SAID FIRST RESILIENT CUSHIONING ELEMENT IN THE AREA THEREOF CORRESPONDING TO SAID PRESSURE AND WEAR RECEIVING SURFACE;

AND A SECOND CUSHIONING ELEMENT COMPRISING RESILIENT RESINOUS FOAM FILLING THE ENTIRE REMAINDER OF SAID CAVITY AND ADHERING TO SAID PRE-STRESS PRESSURE RECEIVING SURFACE, SAID BASE AND SAID SKIN ORDER TO PROVIDE A UNITIZED CONSTRUCTION THEREBETWEEN SAID SECOND CUSHIONING ELEMENT CURED TO THE CONTOUR DEFINED BY SAID CAVITY WITH SAID FIRST CUSHIONING ELEMENT SUBSTANTIALLY COMPRESSED BY PRESSURE APPLIED THEREBY AGAINST SAID PRESSURE RECEIVING SURFACE, WHEREBY BOTH OF SAID CUSHIONING ELEMENTS REMAIN IN RESILIENT COMPRESSION AGAINST SAID SKIN WITHIN SAID ARTICLE.