# US 5,702,736 A · Assembly for manufacturing a piston from plastic material > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 5,702,736 A - Document ID: US5702736A - Status: Granted - Kind: A - Application number: 08/492,645 - Filed: 1995-06-20 - Granted: 1997-12-30 - Earliest claimed: 1994-06-20 - Assignees: ITT Automotive Europe GmbH - Inventors: Nabil Henein - Web page: https://patentgrep.com/patent/US5702736A ## CPC - B60T 11/16: Master control, e.g. master cylinders (master cylinders associated with vacuum boosters B60T13/565) - B29C 45/14065: {Positioning or centering articles in the mould} - B29C 45/2628: {with mould parts forming holes in or through the moulded article, e.g. for bearing cages} - B29C 45/33: having transversely, e.g. radially, movable mould parts - B29C 45/0025: {Preventing defects on the moulded article, e.g. weld lines, shrinkage marks (preventing defects on the preformed parts or layers B29C45/14836)} - B29C 45/44: for undercut articles - B29C 45/641: {Clamping devices using means for straddling or interconnecting the mould halves, e.g. jaws, straps, latches} - B29L 2031/7494: {Pistons} - Y10S 425/01: Core positioning - Y10S 425/058: Undercut - B60T: VEHICLE BRAKE CONTROL SYSTEMS OR PARTS THEREOF; BRAKE CONTROL SYSTEMS OR PARTS THEREOF, IN GENERAL (electrodynamic brake systems for vehicle, in general B60L; brakes per se, i.e. devices where braking effect occurs, including ultimate brake actuators, F16D); ARRANGEMENT OF BRAKING ELEMENTS ON VEHICLES IN GENERAL; PORTABLE DEVICES FOR PREVENTING UNWANTED MOVEMENT OF VEHICLES; VEHICLE MODIFICATIONS TO FACILITATE COOLING OF BRAKES - 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) - B29L: INDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULAR ARTICLES - Y10S: TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS ## Abstract An assembly for manufacturing a plastic piston using a first mold and a second mold, each mold having an axial recess, centering element, core element and contact face. The second mold is movable toward and away from the first mold and can be connected to the first mold using a transverse slide on the first mold and a holding apparatus. ## Claims ### Claim 1 An assembly for manufacturing pistons, comprising: a first mold having a first axial recess; said first axial recess having a first core element and an ejector located therein, said first axial recess being open toward a first contact face on said first mold; said first mold also having at least a first transverse recess oriented generally perpendicularly to said axial recess; a first centering element located on said first mold generally perpendicularly with respect to said first transverse recess; and a second mold movable toward and away from said first mold and having a second contact face and a second centering element; wherein said first and second molds are connected together by at least one transverse slide located in said first transverse recess and connected to said second mold by a holding apparatus. ### Claim 2 (depends on 1) An assembly according to claim 1, wherein said second mold is provided with a second axial recess having at least one diameter equal to a diameter of said first axial recess. ### Claim 3 (depends on 2) An assembly according to claim 2, wherein at least one of said first and second axial recesses includes a truncated face portion located adjacent to, and tapering away from, a corresponding contact face. ### Claim 4 (depends on 1) An assembly according to claim 1, further including a second core element provided in said second mold. ### Claim 5 (depends on 1) An assembly according to claim 1, wherein said holding apparatus comprises at least one second transverse recess in said second mold for receiving a second transverse slide and a holding element for connecting said first and second transverse slides. ### Claim 6 (depends on 5) An assembly according to claim 5, wherein said first and second transverse slides are secured within said holding element, said holding element being arranged laterally of said first and second molds. ### Claim 7 (depends on 5) An assembly according to claim 5, wherein said first and second transverse slides are replaceably secured within said holding element. ### Claim 8 (depends on 5) An assembly according to claim 5, wherein said second mold includes at least two second transverse recesses. ### Claim 9 (depends on 5) An assembly according to claim 5, wherein said holding element is provided on said second mold. ### Claim 10 (depends on 1) An assembly according to claim 1, wherein one of said first axial recess and said second axial recess comprises a tapering section. ### Claim 11 (depends on 1) An assembly according to claim 1, wherein the ejector includes a sleeve having an inner surface and an outer surface; said sleeve outer surface being displaceable in abutting relationship with an inner surface of said first axial recess; and said sleeve inner surface being displaceable in abutting relationship with an outer surface of said first core element.