US3926406A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Casting of metals
Assignee: United States Steel Corp
•
Filing: 1973-08-10
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Granted: 1975-12-16
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Expires: 1993-08-10
Abstract
Abstract A sliding gate valve assembly for use in the casting of metals comprises a resilient device comprising two pad members resiliently urgeable relative to each other by spring means to urge a sliding gate member of the assembly into sealing engagement with a seating therefor and in the event of failure of the spring means, relative movement of said members is severely restricted to correspondingly restrict movement of the gate member away from the seating.
Inventors
- 👤 Robert Duncan Hind
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 01:45
CPC Classifications
B; B22; B22D; B22D41/00; B22D41/14; B22D41/22; B22D41/40
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
142 words
In a sliding gate valve assembly for controlling flow of molten metal, which assembly comprises a sliding gate member, a seating for said gate member, and resilient devices urging said gate member into sealing engagement with said seating, the improvement in which each of said devices comprises: a core member; two spaced-apart pad members mounted on said core member for relative movement in directions longitudinal of said core member; a sleeve member slidably mounted on said core member intermediate said pad members and extending longitudinally of said core member; spring means around said core member acting to urge said pad members apart; and means including said sleeve member acting to restrict severely relative movement of said pad members toward each other to restrict correspondingly movement of said gate member away from said seating in the event of failure of said spring means.
Claim 2
Dependent Claim
142 words
In a sliding gate valve assembly for controlling flow of molten metal, which assembly comprises a sliding gate member, a seating for said gate member, and resilient devices urging said gate member into sealing engagement with said seating, the improvement in which each of said devices comprises: a core member; two spaced-apart pad members mounted on said core member for relative movement in directions longitudinal of said core member; a sleeve member slidably mounted on said core member intermediate said pad members and extending longitudinally of said core member; spring means around said core member acting to urge said pad members apart; and means including said sleeve member acting to restrict severely relative movement of said pad members toward each other to restrict correspondingly movement of said gate member away from said seating in the event of failure of said spring means.
Claim 3
Dependent Claim
37 words
The improvement according to claim 1, wherein a small gap is normally left between each pad member and an adjacent end face of the sleeve member, said gaps defining said restricted relative movement of the pad members.
Claim 4
Dependent Claim
72 words
The improvement according to claim 2, wherein end portions of the sleeve member are each provided with an annular shoulder, and the spring means comprises a first spring assembly seated against the annular shoulder and in engagement with one pad member and a second spring assembly seated against the other annular shoulder and in engagement with the other pad member, the second spring assembly being more powerful than the first spring assembly.
Claim 5
Dependent Claim
16 words
The improvement according to claim 3, wherein each spring assembly comprises a plurality of disc springs.
Claim 6
Dependent Claim
34 words
The improvement according to claim 3, wherein the first spring assembly comprises a plurality of disc springs acting in series, and the second spring assembly comprises a plUrality of disc springs acting in parallel.
Claim 7
Dependent Claim
29 words
The improvement according to claim 1, wherein the spring means comprises a disc spring acting between and in engagement with the sleeve member and one of the pad members.
Claim 8
Dependent Claim
29 words
The improvement according to claim 6, wherein the spring means also comprises a coil spring acting between and in engagement with the disc spring and the other pad member.
Claim 9
Dependent Claim
27 words
A sliding gate valve assembly according to claim 1, wherein the sliding gate member comprises a refractory body and a thin-walled metal casing encasing said refractory body.
Claim 10
Dependent Claim
36 words
A sliding gate valve assembly according to claim 1, comprising a stationary orifice plate providing the seating for the sliding gate member and comprising a refractory body and a thin-walled metal casing encasing said refractory body.
Claim 11
Dependent Claim
25 words
An assembly according to claim 9, wherein the sliding gate member also comprises a refractory body and a thin-walled metal casing encasing the refractory body.
Claim 12
Dependent Claim
45 words
An assembly according to claim 10, wherein each of the orifice plate and sliding gate comprises in plan view two straight sides, two semi-circular end portions joining the sides, and a central circular orifice, and is symmetrical about each of two axes at right angles.
References Cited (Backward Citations)
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-12-15 | 1979-06-16 | 1979-12-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-12-15 | 1983-06-16 | 1983-12-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-12-15 | 1987-06-16 | 1987-12-16 | $7700.00 | Window Closed / Lapsed |