Plastic and nonmetallic article shaping or treating: processes – Carbonizing to form article – Agglomeration or accretion
Patent
1990-04-27
1992-12-29
Tentoni, Leo B.
Plastic and nonmetallic article shaping or treating: processes
Carbonizing to form article
Agglomeration or accretion
73293, 73305, 73319, 733225, 118100, 118120, 118423, 118429, 118500, 118620, 118712, 156 64, 1562728, 1562735, 1562755, 156378, 1563796, 156538, 250432R, 2504921, 250577, 264 401, 264308, 340619, 340623, 340624, 364476, 365106, 365107, 425135, 4251744, 427 8, 427356, 427358, 4274301, 427581, 427582, B29C 3508, B29C 4102
Patent
active
051749319
ABSTRACT:
Apparatus and methods for stereolithographically forming a three-dimensional object includes a vessel for holding a building material and a smoothing member for forming a uniform coating over a previously formed layer of the object. The smoothing member has a plurality of blades. The smoothing member is swept over a previously formed layer of the object, in at least two directions. Different clearances between the lower surface of the smoothing member and the upper surface of the previously formed layer are used to provide a uniform coating for a subsequent layer over the previously formed layer. The sweeping velocity of the smoothing member can be varied. Retractable needles are attached to the smoothing member for adjusting a blade gap between the lower surface of the smoothing member and the surface of the building material.
REFERENCES:
patent: 3957015 (1976-05-01), Harris
patent: 4247508 (1981-01-01), Housholder
patent: 4320394 (1982-03-01), John, Jr.
patent: 4575330 (1986-03-01), Hull
patent: 4942060 (1990-07-01), Grossa
patent: 4942066 (1990-07-01), Fan et al.
Almquist Thomas A.
Jacobs Paul F.
Lewis Charles W.
Lewis Mark A.
Liran Abraham
3-D Systems, Inc.
Tentoni Leo B.
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