US4153231A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Mould assembly for foam moulding of plastic materials
Assignee: Nippon Steel Chemical and Materials Co Ltd
•
Filing: 1977-11-03
•
Granted: 1979-05-08
•
Expires: 1997-11-03
Abstract
Abstract Mould assembly for foam moulding of plastic materials, which comprises stationary and movable dies and an auxiliary die plate device between the stationary and movable dies. A gas passage is formed for introducing pressurized inert gas into the mould cavity. The auxiliary die device comprises separated inner and outer auxiliary dies both being spring biased toward the stationary die. O-ring seals are disposed between the opposite surfaces of the outer auxiliary die and the stationary and movable dies.
Inventors
- 👤 Akifumi Hayakawa
- 👤 Akira Aiba
- 👤 Eiki Orihara
- 👤 Kiyoshi Fukushima
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 20:05
CPC Classifications
B; B29; B29C; B29C44/00; B29C44/34; B29C44/58; B29C44/586; B29C44/02; B29C44/10; B29C44/105; Y; Y10; Y10S; Y10S264/00; Y10S264/83
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
170 words
Mould assembly for foam moulding which comprises a stationary die, a movable die co-operating with said stationary die to form a mould cavity therebetween and movable to change the volume of said mould cavity, auxiliary die means disposed between said stationary and movable dies and having surface means exposed to said mould cavity, means operatively associated with one of said stationary and movable dies for biasing said auxiliary die means toward the other of said stationary and movable dies, means for introducing pressurized gas into said mould cavity, means for drawing gas from said mould cavity, and seal means disposed between said auxiliary die means and said stationary and movable dies, said auxiliary die means including a first auxiliary die having said surface means exposed to said mould cavity and a second auxiliary die located radially outside the first auxiliary die, said first and second auxiliary dies being independently biased by said biasing means, said seal means being disposed between said second auxiliary die and said stationary and movable dies.
Claim 2
Dependent Claim
170 words
Mould assembly for foam moulding which comprises a stationary die, a movable die co-operating with said stationary die to form a mould cavity therebetween and movable to change the volume of said mould cavity, auxiliary die means disposed between said stationary and movable dies and having surface means exposed to said mould cavity, means operatively associated with one of said stationary and movable dies for biasing said auxiliary die means toward the other of said stationary and movable dies, means for introducing pressurized gas into said mould cavity, means for drawing gas from said mould cavity, and seal means disposed between said auxiliary die means and said stationary and movable dies, said auxiliary die means including a first auxiliary die having said surface means exposed to said mould cavity and a second auxiliary die located radially outside the first auxiliary die, said first and second auxiliary dies being independently biased by said biasing means, said seal means being disposed between said second auxiliary die and said stationary and movable dies.
Claim 3
Dependent Claim
24 words
Mould assembly in accordance with claim 1 in which said biasing means is adapted to bias the auxiliary die means toward the stationary die.
Claim 4
Dependent Claim
41 words
Mould assembly in accordance with claim 1 in which at least one of the stationary and movable dies includes sprue means for injecting molten plastic material into the mould cavity, and means for removing residual gas remaining in the mould cavity.
Claim 5
Dependent Claim
47 words
Mould assembly in accordance with claim 3 in which said residual gas removing means includes recess means formed in said at least one die and opening to the mould cavity, said recess means being in communication through valve means with the atmosphere and filled by porous material.
Claim 6
Dependent Claim
16 words
Mould assembly in accordance with claim 4 in which said porous material is a sintered metal.
References Cited (Backward Citations)
US3329198A
Cited
JPS4727271U
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1982-05-07 | 1982-11-06 | 1983-05-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1986-05-07 | 1986-11-06 | 1987-05-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1990-05-07 | 1990-11-06 | 1991-05-08 | $7700.00 | Window Closed / Lapsed |