Spring devices – Cushion for human comfort – Rubber
Patent
1976-11-12
1979-02-13
Kazenske, Edward R.
Spring devices
Cushion for human comfort
Rubber
267153, 264 465, F16F 137
Patent
active
041391870
ABSTRACT:
A cushion includes a core, a shell surrounding the core, and a flexible membrane interposed between the core and the shell. Both the core and shell are formed from foam material, with the foam material of the core being substantially stiffer upon initial loading than the foam material of the shell. The membrane is also formed from foam material, but is quite a bit denser than the foam material of either the core or shell. The overall effect of the membrane and the different load bearing characteristics for the two foam materials is a cushion which is quite soft to touch, but nevertheless capable of supporting heavy loading without excessive deflection. The cushion is produced by placing the core, which is cut from slab foam, into a mold cavity and then molding the shell about it. The amount of liquid reaction material introduced into the cavity, that is the amount of precursors for the foam of the shell, is in excess of the amount necessary to fill the cavity, and the overfill densifies at the surface of the core, forming the membrane.
REFERENCES:
patent: 2892489 (1959-06-01), Hurley
patent: 3432583 (1969-03-01), Robertson
patent: 3520769 (1970-07-01), Baker
patent: 3553749 (1971-01-01), Majeske
patent: 3607601 (1971-09-01), Milam et al.
patent: 3840627 (1974-10-01), Rhodes
patent: 3929948 (1975-12-01), Welch et al.
Kazenske Edward R.
Textron Inc.
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