Patent ID: 9119478
Filing Date: 2015-09-01
Classification: A47C,F16F

Abstract:
1. A dual-spring plunger for a plunger matrix mattress assembly, comprising: a pin guide comprising a flange, a guide body extending from the flange, an outer spring mount extending from the guide body, and an inner spring mount extending from the guide body wherein the outer and inner spring mounts are disposed in an axially tiered relation; a pin slidably received within the pin guide comprising a flange located above the flange of the pin guide, a shaft extending from the flange through the guide body, a fin along the shaft of the pin, and an elongate slot through the fin; an outer tension spring having an upper end fixed to the outer spring mount of the guide body and a lower end located below the guide body positioned to receive a bottom end of the pin shaft; an inner tension spring nested within the outer tension spring having an upper end fixed to the inner spring mount of the guide body and a lower end comprising a spur slidably captured within the slot through the fin of the shaft; wherein 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, and wherein both the outer and the inner spring are tensioned during a second portion of downward movement of the pin relative to the pin guide.