Patent ID: 9072390
Filing Date: 2015-07-07
Classification: A47C,B26D,Y10T

Abstract:
1. A method of manufacturing a foam spring with a tubular resilient body comprising: providing a foam layer having:  wherein both the first and second planar surfaces have longitudinal and lateral dimensions; providing a plurality of cutting blades, each having a cutting edge, the cutting blades arranged on the circumference of a cutting device; providing a cutting surface opposite the cutting blades; forming a plurality of slits extending from the first generally planar surface through to the second generally planar surface, extending between the first and second planar surfaces in a slanted direction forming an acute angle greater than zero degrees relative to a line perpendicular to the first planar surface by the feeding the foam layer in a lateral direction between the cutting blades and the cutting surface while the cutting device rotates, first laterally drawing the first generally planar surface by a first engagement with a leading edge of one of said blades, initiating the angled incision, and then fully forming the incision by continuously feeding the foam layer in the lateral direction until the incision extends through to the second generally planar surface.