# US 4,470,803 A · Method and apparatus for manufacturing articles by pressing and sintering > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 4,470,803 A - Document ID: US4470803A - Status: Granted - Kind: A - Application number: 06/376,430 - Filed: 1982-05-10 - Granted: 1984-09-11 - Earliest claimed: 1978-10-16 - Assignees: Hydra Corporation - Inventors: Robert D. Foster; Frank G. Weeden - Web page: https://patentgrep.com/patent/US4470803A ## CPC - B29C 43/027: {having an axis of symmetry (B29C43/102 takes precedence)} - B28B 7/342: {which are at least partially destroyed, e.g. broken, molten, before demoulding; Moulding surfaces or spaces shaped by, or in, the ground, or sand or soil, whether bound or not; Cores consisting at least mainly of sand or soil, whether bound or not} - B29C 33/448: {destructible (B29C33/52 takes precedence; in particular used in injection moulding B29C45/4457)} - B29C 37/005: {Compensating volume or shape change during moulding, in general} - B29C 43/12: using bags surrounding the moulding material {or using membranes contacting the moulding material} - B29C 43/18: incorporating preformed parts or layers, e.g. compression moulding around inserts or for coating articles {(B29C43/206 takes precedence)} - B29C 70/72: Encapsulating inserts having non-encapsulated projections, e.g. extremities or terminal portions of electrical components {(B29C70/742 takes precedence)} - B30B 11/001: {using a flexible element, e.g. diaphragm, urged by fluid pressure; Isostatic presses} - B29K 2105/251: {Particles, powder or granules (expandable particles B29K2105/046)} - B29L 2007/001: {having irregular or rough surfaces (treads for tyres B29L2030/002)} - B29L 2031/703: {Bellows} - B29L 2031/7506: {Valves} - B29C: SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING (making preforms B29B11/00; making laminated products by combining previously unconnected layers which become one product whose layers will remain together B32B37/00 - B32B41/00) - B28B: SHAPING CLAY OR OTHER CERAMIC COMPOSITIONS; SHAPING SLAG; SHAPING MIXTURES CONTAINING CEMENTITIOUS MATERIAL, e.g. PLASTER (foundry moulding B22C; working stone or stone-like material B28D; shaping of substances in a plastic state, in general B29C; making layered products not composed wholly of these substances B32B) - B30B: PRESSES IN GENERAL (producing ultra-high pressure or ultra-high pressure and high temperature to effect modifications of a substance, e.g. for making artificial diamonds B01J3/00 ){(compressing means for refuse receptacles B65F1/1405)} - B29K: INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR {MOULDS, } REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS - B29L: INDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULAR ARTICLES ## Abstract The invention pertains to the manufacture of articles of thermosetting plastics and other materials. In a first stage, a solid article is formed from a particulate material by introducing such material into a first chamber defined partially by the backing surface of a backing member and partially by the opposed pressing surface of a pressing member. The backing member is frangible and is removably mounted on a support. The first chamber is then closed and the pressing member advanced toward the backing surface to contract the first chamber and compress the particulate material between the pressing and backing surfaces to form the solid article. The pressing member is then retracted, the first chamber is opened, and the backing member and solid article are removed from the support as a unit. Finally, the backing member is fractured and the fragments are removed from the solid article. In a second stage, the convoluted article, or any other similar body is supported in a chamber structure. A filler is disposed between the body and the chamber structure in contact with at least a major portion of the exposed surfaces of the body. The filler and body are then heated, while restricting movement of the filler. ## Claims ### Claim 1 A method of heating an article comprised of two interconnected bodies formed of respective materials having incompatible coefficients of thermal expansion, said method including: supporting restraining means across one of said bodies from the other of said bodies, in contact with at least a major portion of a free surface of said one body distal said other body; and heating said restraining means, said one body, and at least a portion of said other body, while restricting movement of said restraining means away from said other body. ### Claim 2 (depends on 1) The method of claim 1 wherein said one body and said portion of said other body are supported, as a unit, in a chamber structure, and wherein said restraining means comprises a filler disposed between said one body and said chamber structure. ### Claim 3 (depends on 2) The method of claim 2 wherein said chamber structure is heated together with said filler, said one body, and said portion of said other body. ### Claim 4 (depends on 2) The method of claim 2 wherein said filler is a flowable substance poured into a space between said one body and said chamber structure. ### Claim 5 (depends on 4) The method of claim 4 wherein said flowable substance sets to form a solid filler member. ### Claim 6 (depends on 5) The method of claim 5 wherein said filler member is frangible, said method further comprising fracturing said filler member and removing the fragments thereof from said one body subsequent to said heating. ### Claim 7 (depends on 6) The method of claim 6 wherein said filler member is comprised of plaster. ### Claim 8 (depends on 1) The method of claim 1 wherein said one body has a bore receiving said other body and wherein said one body and said other body include interlock formations restricting relative movement of said bodies longitudinally of the bore of said one body in which said other body is received. ### Claim 9 (depends on 1) The method of claim 1 wherein said one body and said portion of said other body are supported, as a unit, in a chamber structure, and wherein said restraining means comprises a solid, frangible filler member disposed between said one body and said chamber structure. ### Claim 10 (depends on 1) The method of claim 1 wherein said one body is comprised of a thermosetting plastic and said other body is comprised of metal. ### Claim 11 A method of sintering a body formed of pressed particulate material having a free surface comprising: supporting said body in a chamber structure; disposing a filler between said body and said chamber structure in contact with at least a major portion of said free surface; and heating said filler and said body while restraining said filler in substantially fixed position against said body. ### Claim 12 (depends on 11) The method of claim 11 wherein said chamber structure is heated together with said filler and said body. ### Claim 13 (depends on 12) The method of claim 12 wherein said filler is a flowable substance poured into a space between said body and said chamber structure. ### Claim 14 (depends on 13) The method of claim 13 wherein said flowable substance sets to form a solid filler member. ### Claim 15 (depends on 11) The method of claim 11 wherein said filler comprises a solid filler member. ### Claim 16 (depends on 15) The method of claim 15 wherein said filler member is frangible. ### Claim 17 (depends on 16) The method of claim 16 wherein said filler member is comprised of plaster. ### Claim 18 (depends on 16) The method of claim 16 further comprising fracturing said filler member and removing the fragments thereof from said body subsequent to said heating. ### Claim 19 (depends on 11) The method of claim 11 wherein said body is generally annular, wherein said filler is disposed in contact with outer surfaces of said body, and wherein backing means are positioned within said body in contact with the inner surfaces thereof prior to said heating. ### Claim 20 (depends on 11) The method of claim 11 wherein said filler is thus restrained by enclosing said filler within said chamber structure, with said chamber structure abutting those boundary surfaces of said filler which are not in contact with said free surface of said body.