US3895747A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Resin flow controlling device for injection molding machine
Assignee: Nissei Plastic Industrial Co Ltd
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Filing: 1973-10-04
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Granted: 1975-07-22
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Expires: 1993-10-04
Abstract
Abstract A resin flow controlling device for an injection molding machine which is simple in structure and effective in operation without a large pressure loss, retention and leakage of molten resin, and comprises an orifice formed near the outlet of a molten resin passage; a gap formed between said outlet and said orifice; and a valve plate positioned in said gap; in which said valve plate being made of a spring plate and comprising a bent or folded portion and openings for resin passage, and said closing portion contacting said orifice and being deformed by the pressure of the molten resin to open said orifice.
Inventors
- 👤 Katashi Aoki
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 19:56
CPC Classifications
B; B29; B29C; B29C45/00; B29C45/17; B29C45/26; B29C45/27; B29C45/28; B29C45/20; B29C45/23; B29C45/234; F; F16; F16K; F16K15/00; F16K15/14; F16K15/144; F16K15/147; Y; Y10; Y10T; Y10T137/00; Y10T137/7722; Y10T137/7837; Y10T137/7879; Y10T137/7887
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
129 words
A resin flow controlling device for an injection molding machine which comprises an orifice formed near the outlet of a molten resin passage; gap means formed between said outlet and said orifice; a valve plate positioned within said gap; said valve plate comprising a spring plate having a bent closing portion and defining with said gap openings for resin passage, said closing portion normally contacting said orifice and being deformable to an out of contact position by pressure of molten resin at said orifice to open said orifice, wherein said gap means further comprises a supporting member defining an opening for resin passage between said valve plate and said outlet, said supporting member adapted to maintain said closing portion of said spring plate in said out of contact position.
Claim 2
Dependent Claim
129 words
A resin flow controlling device for an injection molding machine which comprises an orifice formed near the outlet of a molten resin passage; gap means formed between said outlet and said orifice; a valve plate positioned within said gap; said valve plate comprising a spring plate having a bent closing portion and defining with said gap openings for resin passage, said closing portion normally contacting said orifice and being deformable to an out of contact position by pressure of molten resin at said orifice to open said orifice, wherein said gap means further comprises a supporting member defining an opening for resin passage between said valve plate and said outlet, said supporting member adapted to maintain said closing portion of said spring plate in said out of contact position.
Claim 3
Dependent Claim
99 words
A resin flow controlling device for an injection molding machine as claimed in claim 1, in which said closing portion is formed in the middle of said valve plate, said openings for resin passage are formed on the peripheral portions of said valve plate, further said closing portion is provided with a conical projection, and the tapered surface of said conical projection is pushed to said orifice to close said orifice with such pressure that, when the pressure of molten resin being applied in the injection step, said conical projection is separated from said orifice to open said orifice.
Claim 4
Dependent Claim
30 words
A resin flow controlling device for an injection molding machine as claimed in claim 1, in which said device is attached to the top end portion of an injection cylinder.
Claim 5
Dependent Claim
33 words
A resin flow controlling device for an injection molding machine as claimed in claim 1, in which said device is attached between the gate of mold cavity and hot runner in a mold.
Claim 6
Dependent Claim
27 words
A resin flow controlling device for an injection molding machine as claimed in claim 1, in which the plan shape of said valve plate is a rectangle.
Claim 7
Dependent Claim
27 words
A resin flow controlling device for an injection molding machine as claimed in claim 1, in which the plan shape of said valve plate is a cross.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-07-21 | 1979-01-20 | 1979-07-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-07-21 | 1983-01-20 | 1983-07-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-07-21 | 1987-01-20 | 1987-07-22 | $7700.00 | Window Closed / Lapsed |