# US 9,751,240 B2 · Resin vehicle part manufacturing method and resin vehicle part > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 9,751,240 B2 - Document ID: US9751240B2 - Status: Granted - Kind: B2 - Application number: 14/413,844 - Filed: 2013-12-26 - Published: 2015-10-29 - Granted: 2017-09-05 - Earliest claimed: 2013-01-15 - Assignees: Toyota Shatai Kabushiki Kaisha - Applicants: Toyota Shatai Kabushiki Kaisha - Inventors: Katsuya Ikeno; Tomohiro Arakawa; Yoshihisa Yamashita; Nobuyoshi Nishikawa - Web page: https://patentgrep.com/patent/US9751240B2 ## CPC - B29C 33/42: characterised by the shape of the moulding surface, e.g. ribs or grooves - B29C 45/37: Mould cavity walls {, i.e. the inner surface forming the mould cavity, e.g. linings} - B29C 45/44: for undercut articles - B29C 45/56: using mould parts movable during or after injection, e.g. injection-compression moulding {(B29C45/1705 and B29C45/572 take precedence)} - B60R 19/18: {characterised by the cross-section;} Means within the bumper to absorb impact - B29C 2045/363: {using a movable core or core part} - B29L 2031/3005: {Body finishings} - B29L 2031/3041: {Trim panels} - B60R 2019/1886: {Bumper fascias and fastening means therefor} - 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) - B60R: VEHICLES, VEHICLE FITTINGS, OR VEHICLE PARTS, NOT OTHERWISE PROVIDED FOR - B29L: INDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULAR ARTICLES ## Abstract A method for manufacturing a resin vehicle part provided with a panel body having a decorative surface on the front surface and a stepped reinforcing rib, which stands on the back surface of the panel body and the thickness of the base end of which is formed to be thinner than the thickness of the leading end. On the injection molding die thereof, a sliding piece for forming the stepped reinforcing rib is provided so as to be movable. During shrinkage movement of the stepped reinforcing rib in the height direction after molten resin has been filled in the injection molding die, the sliding piece is pressed by the leading end of the stepped reinforcing rib and moves towards the panel body. ## Claims ### Claim 1 A method for manufacturing a resin vehicle part provided with a panel body having a front surface including a design surface and a stepped reinforcing rib formed standing on a back surface of the panel body, the stepped reinforcing rib having a base end portion with a thickness thinner than a leading end portion, wherein an injection molding die for the resin vehicle part includes a movable slide piece to form the reinforcing rib, after molten resin is filled in the injection molding die, the slide piece is pushed by the leading end portion of the stepped reinforcing rib and moved in a direction to come close to the panel body according to shrinkage of the stepped reinforcing rib in a height direction. ### Claim 2 (depends on 1) The method for manufacturing a resin vehicle part according to claim 1, wherein the slide piece is movably connected to a lifting part of a lifting device provided in the injection molding die through an elastic element that urges the slide piece in a direction to come close to the lifting part, and the slide piece is moved upward together with the lifting part during product demolding. ### Claim 3 (depends on 1) The method for manufacturing a resin vehicle part according to claim 1, wherein the injection molding die includes an insert die in which the slide piece is slidably fitted, and the method includes filling molten resin in a cavity provided in a gap between the slide piece and the insert die to form the stepped reinforcing rib. ### Claim 4 (depends on 3) The method for manufacturing a resin vehicle part according to claim 3, wherein a groove-shaped cavity is provided in a shoulder of the slide piece or the insert die, the groove-shaped cavity being communicated with the cavity for forming the stepped reinforcing rib, and the method includes filling molten resin in the groove-shaped cavity to form a triangular reinforcing rib for reinforcing only a root of the base end portion of the stepped reinforcing rib. ### Claim 5 A method for manufacturing a resin vehicle part provided with a panel body having a front surface including a design surface and a stepped reinforcing rib formed standing on a back surface of the panel body, the reinforcing rib having a base end portion with a thickness thinner than a leading end portion, wherein an injection molding die for the resin vehicle part includes a first slide piece for forming one stepped reinforcing rib so that the first slide piece is movable in a demolding direction and a second slide piece for forming the other stepped reinforcing rib so that the second slide piece is movable in a direction different from the demolding direction, after molten resin is filled in the injection molding die, the first slide piece and the second slide piece are pushed by the leading end portions of the stepped reinforcing ribs in a direction to come close to the panel body according to shrinkage of the stepped reinforcing ribs in a height direction. ### Claim 6 (depends on 5) The method for manufacturing a resin vehicle part according to claim 5, wherein the injection molding die includes lock pins for fixing the first slide piece and the second slide piece in respective positions, the method includes locking the lock pins in the first slide piece and the second slide piece before the molten resin is filled in the injection molding die, and releasing the lock pins from the first slide piece and the second slide piece after the molten resin is filled in the injection molding die. ### Claim 7 (depends on 5) The method for manufacturing a resin vehicle part according to claim 5, wherein the injection molding die includes a second insert die in which the second slide piece is slidably fitted, the method includes filling molten resin in a cavity provided in a gap between the second slide piece and the second insert die to form the stepped reinforcing rib. ### Claim 8 (depends on 7) The method for manufacturing a resin vehicle part according to claim 7, wherein the method includes moving the second insert die in a direction to expand a cavity of the stepped reinforcing rib formed in the gap between the second slide piece and the second insert die during product demolding. ### Claim 9 (depends on 7) The method for manufacturing a resin vehicle part according to claim 7, wherein the cavity for the stepped reinforcing rib formed in the gap between the second slide piece and the second insert die is formed linearly in almost the same direction as the demolding direction of the injection molding die.