US Patent 11661989 Hollow tubular center bulging foam spring
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US Patent 11661989 Hollow tubular center bulging foam spring
Article
A hollow tubular foam spring having a plurality of radially extending holes extending from an outer surface towards a central hollow core. The tubular foam spring is arranged with wall thickness and diameter to height ratios such that center bulging is achieved under compressive loads. In an embodiment, such as in a mattress, seat, cushion or pillow, springs are arranged in an array whereby some impinge upon one another due to central bulging.
Infobox
Is a
Patent Jurisdiction
Patent Number
116619890
Date of Patent
May 30, 2023
0Patent Application Number
167666150
Date Filed
November 20, 2018
0Patent Citations
Patent Primary Examiner
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