Dual-spring plunger for a plunger matrix mattress
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United States of America Patent
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Sep 1, 2015
Grant Date -
May 22, 2014
app pub date -
Nov 20, 2013
filing date -
Nov 20, 2012
priority date (Note) -
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Abstract
A dual-spring plunger for a plunger matrix mattress assembly includes an outer tension spring with an upper end fixed to an outer spring mount of a plunger guide body and a lower end located below the guide body positioned to receive a bottom end of a pin of the plunger. An inner tension spring nested within the outer tension spring has an upper end fixed to the inner spring mount of the guide body and a lower end having a spur slidably captured within a slot through a fin of the shaft of the pin. The outer spring is tensioned while the inner spring is not tensioned during a first portion of downward movement of the pin relative to the pin guide, whereas both the outer and the inner spring are tensioned during a second portion of downward movement of the pin relative to the pin guide.
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