# US 10,870,229 B2 · Mold stack for injection molding machine > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 10,870,229 B2 - Document ID: US10870229B2 - Status: Granted - Kind: B2 - Application number: 15/737,366 - Filed: 2016-06-01 - Published: 2018-06-14 - Granted: 2020-12-22 - Earliest claimed: 2015-07-08 - Assignees: Husky Injection Molding Systems Ltd. - Applicants: Husky Injection Molding Systems Ltd. - Inventors: Arnold Heinz Mai - Web page: https://patentgrep.com/patent/US10870229B2 ## CPC - B29C 45/4421: {using expansible or collapsible cores} - B29C 45/2614: {for manufacturing bent tubular articles using an undercut forming mould core} - B29C 45/36: having means for locating or centering cores - B29C 45/40: Removing or ejecting moulded articles - B29C 45/33: having transversely, e.g. radially, movable mould parts - B29C 2045/4078: {using stripping means} - 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) ## Abstract A mold stack for a mold comprises a mold core configured for reception in a mold cavity plate with an outer molding surface. The mold core comprises an inner core with a first tapered guide surface and an outer core with a second tapered guide surface. The inner core is received through a passage in the outer core. A spacer slidably supports the outer core on the inner core. The outer core is movable relative to the inner core between a molding position in which the inner and outer cores define a mold cavity with the outer molding surface, and an open position in which the outer core is extended relative to the inner core. In the molding position, the first and second tapered guide surfaces engage one another to align the inner and outer cores. ## Claims ### Claim 1 A mold stack for a mold, comprising: a cavity assembly defining an outer molding surface; a mold core configured for reception in said cavity assembly, said mold core comprising: a first core member having a first inner molding surface; a passage extending through said first core member, said passage having first tapered guide surface; a second core member received in said passage, said second core member having a second inner molding surface and a second tapered guide surface; a spacer slidably supporting said first core member on said second core member; said first core member movable relative to said second core member, between a molding position in which said first and second inner molding surfaces cooperate with said outer molding surface to define a mold cavity, and an open position in which said first core member is extended relative to said second core member, wherein said first and second tapered guide surfaces engage one another to align said first and second core members in said molding position. ### Claim 2 (depends on 1) The mold stack of claim 1, further comprising a third core member, wherein said first core member is received in an internal passage through said third core member, wherein said third core member is slidably supported on said first core member by a spacer. ### Claim 3 (depends on 2) The mold stack of claim 2, wherein said third core member is a stripper sleeve, said stripper sleeve having a part-engaging surface for pushing a molded part off of said mold core, wherein said part-engaging surface is offset from said first core member. ### Claim 4 (depends on 1) The mold stack of claim 1, wherein at least one of said first core member and said second core member comprises a removable tip, wherein said first molding surface or said second molding surface is formed on said removable tip. ### Claim 5 (depends on 4) The mold stack of claim 4, wherein each one of said first core member and said second core member comprises a removable tip, wherein said first molding surface and said second molding surface are formed on said removable tips. ### Claim 6 (depends on 4) The mold stack of claim 4, wherein said removable tips are fixed by interlocking fasteners. ### Claim 7 (depends on 6) The mold stack of claim 6, wherein said removable tips are fixed by set screws. ### Claim 8 (depends on 4) The mold stack of claim 4, wherein said first tapered guide surface and said second tapered guide surface are formed on said removable tips. ### Claim 9 (depends on 1) The mold stack of claim 1, comprising a first spacer received in a recess in said first core member and a second spacer received in a recess in said second core member, said first core member slidably supported on said second core member by said first and second spacers. ### Claim 10 (depends on 1) The mold stack of claim 1, wherein said spacer is formed from a material having lower hardness than both of said first core member and said second core member. ### Claim 11 A mold core for a mold stack of a mold, comprising: a first core member with an internal passage extending therethrough, said first core member having a first tapered guide surface in said internal passage; a second core member received in said internal passage, said second core member having a second tapered guide surface corresponding to said first tapered guide surface; a spacer interposed between said first core member and said second core member, said spacer slidably supporting said first core member on said second core member; said first core member movable relative to said second core member from an open position to a molding position, wherein in said molding position, said first and second core members cooperatively define an inner molding surface and said second tapered guide surface engages said first tapered guide surface to align said first and second core members. ### Claim 12 (depends on 11) The mold core of claim 11, further comprising a third core member, wherein said first core member is received in an internal passage through said third core member, wherein said third core member is slidably supported on said first core member by a second spacer. ### Claim 13 (depends on 12) The mold core of claim 12, wherein said third core member is a stripper sleeve, said stripper sleeve having a part-engaging surface for ejecting a part from said mold core, wherein said part-engaging surface is offset from said first core member. ### Claim 14 (depends on 11) The mold core of claim 11, wherein at least one of said first core member and said second core member comprises a removable tip. ### Claim 15 (depends on 14) The mold core of claim 14, wherein each one of said first core member and said second core member comprises a removable tip, wherein said removable tips cooperate to define said molding surface in said molding position. ### Claim 16 (depends on 14) The mold core of claim 14, wherein said removable tips are fixed by interlocking fasteners. ### Claim 17 (depends on 16) The mold core of claim 16, wherein said removable tips are fixed by set screws. ### Claim 18 (depends on 14) The mold core of claim 14, wherein said first tapered guide surface and said second tapered guide surface are formed on said removable tips. ### Claim 19 (depends on 11) The mold core of claim 11, comprising a first spacer received in a recess in said first core member and a second spacer received in a recess in said second core member, said first core member slidably supported on said second core member by said first and second spacers. ### Claim 20 (depends on 11) The mold core of claim 11, wherein said spacer is formed from a material having lower hardness than both of said first core member and said second core member.