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US 5,173,307 AGranted
Foam-rebonding mold
AssigneeHerman Miller, Inc.
InventorDavid E. Nestle
Life of this patent
Estimating the term…
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AssigneeHerman Miller, Inc.
InventorDavid E. Nestle
Estimating the term…
This relates to a mold for rebonding polyurethane and like plastic foam to form selected shapes. A typical shape may be a back or a seat member for an article of furniture. The mold is improved in that the bottom mold member, which is particularly designed in accordance with the desired configuration of the shape, has been formed of epoxy which is readily moldable at a low cost. The mold is also improved by providing the base plate of the mold with a ramped floor which facilitates the drainage of condensate from a lower steam chamber. The configuration of the ramped floor allows for quick removal of the condensate and serves to reduce the volume in the steam chamber thereby minimizing pressure build-up in the steam chamber. This results in lower steam pressures being used during the curing process and for a shorter curing operation. The lower steam pressure also avoids leakage of steam and water from the epoxy mold.
A foam rebonding mold wherein a molded foam member is formed from particles of existing foam which are bonded together in a curing operation utilizing steam, said mold comprising a mold base plate, a contoured lower mold member carried by said base plate and in combination with said base plate defining a steam chamber, a foaming core cooperative with said lower mold member to define a mold cavity, a steam inlet on one side of said mold for directing steam into said steam chamber, and a condensate drain from said steam chamber, said mold being improved by said steam inlet being adjacent said condensate drain, said base plate having an upper surface defining a bottom wall of said steam chamber and being in the form of a ramp sloping from an opposite side of said mold downwardly towards said steam inlet and condensate drain for continuously removing condensate from all parts of said steam chamber.
Dependencies are inferred from the claim text.