초록 ▼

An exemplary injection mold includes a first mold, a second mold, and a trimming member. The first mold and the second mold cooperatively define a cavity therein, for forming a molded article. A runner is defined in the second mold and communicated with the cavity, for melted resin running therethro

An exemplary injection mold includes a first mold, a second mold, and a trimming member. The first mold and the second mold cooperatively define a cavity therein, for forming a molded article. A runner is defined in the second mold and communicated with the cavity, for melted resin running therethrough. A through hole is defined in the second mold, with an end disposed at a connection between the runner and the cavity. The trimming member is slidably received in the through hole, moving between a first position to allow melted resin flowing into the cavity and a second position to prevent melted resin flowing into the cavity.

대표청구항 ▼

What is claimed is: 1. An injection mold comprising: a first mold; a second mold together with the first mold cooperatively defining a cavity therebetween for forming a molded article, the second mold comprising a runner defined therein for melted resin running therethrough, the runner comprising a

What is claimed is: 1. An injection mold comprising: a first mold; a second mold together with the first mold cooperatively defining a cavity therebetween for forming a molded article, the second mold comprising a runner defined therein for melted resin running therethrough, the runner comprising a nozzle communicating with the cavity, a through hole defined in the second mold and having an end disposed at a connection between the nozzle and the cavity; and a trimming member slidably received in the through hole of the second mold and being movable between a first position where the trimming member is removed from the nozzle to allow the melted resin flowing into the cavity and a second position where the trimming member closes the nozzle to prevent the melted resin flowing into the cavity, wherein the through hole comprises a rounded portion communicating with the nozzle of the runner, and a rectangular portion connecting with the rounded portion, the trimming member comprises a rounded portion, and a rectangular portion, corresponding to the rounded portion and the rectangular portion of the through hole of the second mold respectively. 2. The injection mold as claimed in claim 1, wherein a distal end of the rounded portion of the through hole is disposed at the connection between the cavity and the nozzle of the runner. 3. The injection mold as claimed in claim 2, wherein a distal end of the trimming member comprises a flat surface aligning with a surface of the molded article, and a slanting surface extending from the flat surface for guiding superfluous melted resin out of the nozzle when the trimming member is located at the second position. 4. The injection mold as claimed in claim 1, wherein a size of the rounded portion of the through hole is less than that of the rectangular portion. 5. The injection mold as claimed in claim 1, wherein the trimming member is driven by a driving member. 6. An injection mold comprising: a cavity configured for forming a molded article therein; a runner configured for melted resin running therethrough to the cavity, a nozzle defined at one end of the runner to communicate the runner with the cavity; a through hole with an end located at a junction between the nozzle of the runner and the cavity; and a trimming member slidably moving in the through hole and comprising a flat surface and a slanting surface extending from the flat surface formed at a distal end thereof, the trimming member moving away from the cavity for allowing melted resin flowing into the cavity via the nozzle of the runner and moving toward the cavity with the flat surface contacting with a wall of the molded article to separate the cavity from the runner after the melted resin fills up the cavity. 7. The injection mold as claimed in claim 6, comprising a first mold, and a second mold, cooperatively defining the cavity for forming the molded article. 8. The injection mold as claimed in claim 7, wherein the through hole and the runner are defined in the second mold. 9. The injection mold as claimed in claim 8, wherein the trimming member comprises a rounded portion, and a rectangular portion extending from the rounded portion, the through hole has a configuration, corresponding to the trimming member. 10. The injection mold as claimed in claim 9, wherein a size of the rounded portion of the trimming member is less than that of the rectangular portion thereof. 11. An injection mold for molding an article comprising a critical surface for appearance and a non-critical surface for appearance, the injection mold comprising: a first mold; a second mold, the second mold cooperating with the first mold to define a cavity therebetween for forming the article, a cast gate of the cavity disposed at the non-critical surface for appearance of the article, a runner defined in the second mold to communicate with the cast gate for melted resin running therethrough, and a through hole defined in the second mold communicating with the cast gate, the first mold comprising a protruding portion located beside the cavity of the second mold for forming a surface of the article adjacent the non-critical surface of the article; and a trimming member slidably received in the through hole of the second mold and moving between a first position to allow melted resin flowing into the cavity and a second position to close the cast gate, wherein the trimming member is capable of moving toward the cast gate until a distal end of the trimming member is blocked by the protruding portion to close the cast gate and form the non-critical surface. 12. The injection mold as claimed in claim 11, wherein the trimming member comprises a top surface for closing the cast gate, and a slanting surface neighboring the top surface for guiding superfluous melted resin out of the cast gate. 13. The injection mold as claimed in claim 12, wherein the through hole and the trimming member each are stepped, and wherein when a shoulder of the trimming member touches a shoulder of the through hole, the top surface closes the cast gate. 14. The injection mold as claimed in claim 12, wherein the top surface contacts with the first mold at the second position to thereby close the gate and separate the article formed in the cavity from melted resin remained at the runner. 15. The injection mold as claimed in claim 11, wherein one end portion of the cavity overlaps the gate in movement direction of the trimming member.