US4779667A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Degassing apparatus for a metal mold
Assignee: Ube Machinery Corp Ltd
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Filing: 1988-03-08
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Granted: 1988-10-25
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Expires: 2008-03-08
Abstract
Abstract A degassing apparatus for a metal mold comprises a valve body and a bypass. The valve body is slidably provided between an end of a vent groove communicating with a metal mold cavity and a valve opening/closing portion before an exhaust hole. When a molten metal flowing from the cavity acts on a surface of the valve body, the valve body moves toward the exhaust hole and blocks a path toward the exhaust hole. The bypass bypasses a valve head of the valve body from the vent groove and guides gas to the exhaust hole. The valve head of the valve body has a substantially head-cutting conical outer shape projecting in the direction of the vent groove. The vent groove has a gas vent path extending from a top portion to the vicinity of the base of the valve head along an outer surface of the valve head. An end portion of the gas vent path corresponding to the base of the valve head communicates with a start portion of the bypass which bypasses the valve head.
Inventors
- 👤 Kiyoshi Fujino
- 👤 Kenji Ishimoto
- 👤 Minoru Kuriyama
- 👤 Kousei Murakami
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 21:12
CPC Classifications
B; B22; B22D; B22D17/00; B22D17/14; B22D17/145; Y; Y10; Y10S; Y10S425/00; Y10S425/812
Claims Analysis
Total Claims: 21
Claim 1
Independent Claim
171 words
A degassing apparatus incorporated with a metal mold, comprising: valve means, slidably provided between an end of a degassing channel communicating with said metal mold cavity and a valve opening/closing portion before an exhaust port and having a surface on which a molten metal flowing from said cavity acts, for moving toward the exhaust port and for blocking a path toward the exhaust port; and a bypass for bypassing a valve head of said valve means from said degassing channel and guiding gas to the exhaust port, wherein said valve means has said valve head having a substantially head-cutting conical outer shape projecting in the direction of said degassing channel, said degassing channel has a gas vent path extending from a top portion to the vicinity of the base of said valve head along an outer surface of said valve head, and an end portion of said gas vent path corresponding to the base of said valve head communicates with a start portion of said bypass which bypasses said valve head.
Claim 2
Dependent Claim
171 words
A degassing apparatus incorporated with a metal mold, comprising: valve means, slidably provided between an end of a degassing channel communicating with said metal mold cavity and a valve opening/closing portion before an exhaust port and having a surface on which a molten metal flowing from said cavity acts, for moving toward the exhaust port and for blocking a path toward the exhaust port; and a bypass for bypassing a valve head of said valve means from said degassing channel and guiding gas to the exhaust port, wherein said valve means has said valve head having a substantially head-cutting conical outer shape projecting in the direction of said degassing channel, said degassing channel has a gas vent path extending from a top portion to the vicinity of the base of said valve head along an outer surface of said valve head, and an end portion of said gas vent path corresponding to the base of said valve head communicates with a start portion of said bypass which bypasses said valve head.
Claim 3
Dependent Claim
43 words
An apparatus according to claim 1, wherein a restrictor is provided in the vicinity of a coupling of said start portion of said bypass and said end portion of said gas vent path to give resistance to the flow of the molten metal.
Claim 4
Dependent Claim
29 words
An apparatus according to claim 1, wherein said top portion of said valve head has a recess so that the molten metal can easily act on said valve head.
Claim 5
Dependent Claim
30 words
An apparatus according to claim 3, wherein a diameter of said recess is larger than a size of a section of a portion of said degassing channel opposing said recess.
Claim 6
Dependent Claim
15 words
An apparatus according to claim 1, wherein said bypass has a reservoir at its corner.
Claim 7
Dependent Claim
39 words
An apparatus according to claim 1, wherein an outer surface of said valve head is formed stepwise, and a portion of a degassing block that opposes said outer surface and defines said gas vent path is also formed stepwise.
Claim 8
Dependent Claim
22 words
An apparatus according to claim 6, wherein a restrictor is formed by causing both stepped portions not to correspond to each other.
Claim 9
Dependent Claim
30 words
An apparatus according to claim 1, wherein a sectional area of said gas vent path through which a fluid flows is decreased from its start portion toward its end portion.
Claim 10
Dependent Claim
46 words
An apparatus according to claim 1, wherein said base of said valve head is hollow, and a hole is formed in a side wall of said valve head so that said cavity communicates with said exhaust port when said valve head is at its lowest position.
Claim 11
Dependent Claim
16 words
An apparatus according to claim 9, wherein a restrictor is provided in said gas vent path.
Claim 12
Dependent Claim
15 words
An apparatus according to claim 8, wherein a reservoir is provided downstream of said restrictor.
Claim 13
Dependent Claim
14 words
An apparatus according to claim 1, wherein a restrictor is provided in said bypass.
Claim 14
Dependent Claim
15 words
An apparatus according to claim 2, wherein a reservoir is formed downstream of said restrictor.
Claim 15
Dependent Claim
14 words
An apparatus according to claim 2, wherein a reservoir is formed outside said restrictor.
Claim 16
Dependent Claim
48 words
An apparatus according to claim 1, wherein said valve head consists of a large-diameter portion and a small-diameter portion having said head-cutting conical outer shape and projecting from said large-diameter portion toward said degassing channel, said large- and small-diameter portions defining a stepped portion in said valve head.
Claim 17
Dependent Claim
33 words
An apparatus according to claim 1, wherein a stepped portion is formed in the base of said valve head, and said start portion of said bypass is formed to oppose said stepped portion.
Claim 18
Dependent Claim
19 words
An apparatus according to claim 15, wherein a recess is formed in a top portion of said valve head.
Claim 19
Dependent Claim
36 words
An apparatus according to claim 17, wherein said recess is a conical hole, and a diameter of an inlet of said recess is larger than that of a portion of said degassing channel opposing said recess.
Claim 20
Dependent Claim
25 words
An apparatus according to claim 15, wherein a restrictor is formed in a region of said gas vent path close to said metal mold cavity.
Claim 21
Dependent Claim
35 words
An apparatus according to claim 15, wherein a length of said small-diameter portion of said valve head is larger than an opening of said start portion of said bypass communicating with said gas vent path.
References Cited (Backward Citations)
US4431047A
Cited
US4691755A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1991-10-25 | 1992-04-25 | 1992-10-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-10-25 | 1996-04-25 | 1996-10-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-10-25 | 2000-04-25 | 2000-10-25 | $7700.00 | Window Closed / Lapsed |