Heating – Work chamber having heating means – Combustion products heat work by contact
Reexamination Certificate
2005-01-11
2005-01-11
Wilson, Gregory (Department: 3749)
Heating
Work chamber having heating means
Combustion products heat work by contact
C432S183000, C432S028000
Reexamination Certificate
active
06840765
ABSTRACT:
There is provided a heat treatment unit which uses a multi-layered heat treatment furnace (1) comprising a layer of fluidized bed (2) composed of particles and another layer of atmosphere layer (3) composed of gases, the former being excellent in thermal efficiency and uniformity of heat distribution and the latter being positioned in the free board section over the fluidized bed (2), in which these layers operate at temperature levels different from each other, and the work piece is heat-treated by being partly immersed in the fluidized bed (2) having a given temperature with the other part being exposed in the atmosphere layer (3) also operating at a given temperature, according to desired mechanical properties of the work piece at each position. This heat treatment unit is improved from the conventional one in that it can give desired mechanical properties which are required by each part of metallic work requires without increasing the investment cost.
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Asahi Tec Corporation
Parkhurst & Wendel L.L.P.
Wilson Gregory
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