| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a new opening or closing type injection head in which a high sealing performance is realized against an injection port formed at a nozzle side surface. <P>SOLUTION: An opening or closing type injection head 1 comprises a joint 2, a head body 3, a nozzle 4, a nozzle pin 5 and a mechanism 6 for producing a forwarding motion or a retracting motion of the pin 5 in response to a depressing and a returning of the head body 3, wherein the nozzle 4 comprises a nozzle base part 4a having a passage P<SB>3a</SB>communicated with the body 3 and connected to the body 3, a nozzle extremity end part 4b having a passage P<SB>3b</SB>communicated with the nozzle base part 4a and connected to the nozzle base part 4a and a plug body 4c arranged at the passage P<SB>3b</SB>of the nozzle extremity end to seal an injection port A formed at the side surface of the nozzle extremity end part 4b, the plug body 4c is connected to the nozzle base part 4a through a resilient portion 4d that can be deformed and recovered and at the same time it is connected to a head 5e arranged at the pin 5 with an engagement claw 4e arranged at the plug body 4c to enable a releasing caused by a raising-up of the plug body 4c and a sealing accompanied with its returning to be performed according to the advance and retreat of the pin 5. <P>COPYRIGHT: (C)2010,JPO&INPIT |
