| (19) |
 |
|
(11) |
EP 0 475 654 A3 |
| (12) |
EUROPEAN PATENT APPLICATION |
| (88) |
Date of publication A3: |
|
09.12.1992 Bulletin 1992/50 |
| (43) |
Date of publication A2: |
|
18.03.1992 Bulletin 1992/12 |
| (22) |
Date of filing: 02.09.1991 |
|
|
| (84) |
Designated Contracting States: |
|
FR GB IT |
| (30) |
Priority: |
14.09.1990 JP 245788/90
|
| (71) |
Applicant: RYOBI LTD. |
|
Fuchu-shi,
Hiroshima-ken (JP) |
|
| (72) |
Inventors: |
|
- Yamauchi, Noriyoshi,
c/o Ryobi Ltd.
Fuchu-shi,
Hiroshima-ken (JP)
- Ishida, Hitoshi,
c/o Ryobi Ltd.
Fuchu-shi,
Hiroshima-ken (JP)
- Kwai, Kazuaki,
c/o Ryobi Ltd.
Fuchu-shi,
Hiroshima-ken (JP)
|
| (74) |
Representative: Jackson, Peter Arthur |
|
GILL JENNINGS & EVERY
Broadgate House
7 Eldon Street
London EC2M 7LH
London EC2M 7LH (GB) |
|
| |
|
| (54) |
Metal mold structure having gas venting unit and jig for removing the gas venting
unit in injection molding apparatus |
(57) s7 A metal mold structure having a separate gas venting unit (113) detachable from
a metal mold (101). The gas venting unit disposes therein a gas vent valve. The metal
mold (101) is formed with an upper opening (103) in which an insertion segment (105)
is insertable. Upon the insertion, a unit insertion recessed portion (111) is provided.
The unit insertion recessed portion (111) has a recessed shape substantially identical
with an external contour of the gas venting unit. A jig device (129) is also provided
for removing the gas venting unit (113) from the recessed portion (111). The jig device
includes a jig body (131) mounted on the metal mold (101), a bolt like moving means
(137) movably extending through the jig body and selectively engageable with the gas
venting unit (113) positioned in the unit insertion recessed portion, and a driving
means (135) for moving the moving means in an axial direction thereof.