Patent US3580326A successfully refreshed from Google Patents.
US3580326A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Apparatus for making foundry cores and moulds
Assignee: British Cast Iron Research Association
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Filing: 1969-03-26
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Granted: 1971-05-25
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Expires: 1989-03-26
Abstract
Abstract In the production of sand-based foundry cores and mould bodies by a substantially cold curing process employing a resin and a catalyst, charges of sand containing resin and sand containing catalyst are prepared in separate driven mixer-feeder units forming part of apparatus incorporating separate chambers into which the charges from the mixer-feeder units are fed and from which they are blown into a common reaction chamber, the mixture then being blown from that chamber into a core-box or mould.
Inventors
- 👤 Albert Edwards
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 09:15
CPC Classifications
B; B22; B22C; B22C5/00; B22C5/04; B22C5/0409; B22C5/0463; B22C5/0468; B22C15/00; B22C15/23; B22C15/24
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
110 words
Apparatus for forming sand-based foundry core and mould bodies by a substantially cold curing process employing a resin and a catalyst, comprising two rotary mixer-feeder units, means for feeding sand to both units and means for feeding liquid resin to one unit and liquid catalyst to the other, means for driving the units and means for controlling the duration of driving, separate chambers for receiving the charges from the respective units, means for closing off said chambers from the units, means for blowing the charges from said chambers into a common reaction chamber, and means for blowing the mixture formed in the reaction chamber into a core box or mould.
Claim 2
Dependent Claim
110 words
Apparatus for forming sand-based foundry core and mould bodies by a substantially cold curing process employing a resin and a catalyst, comprising two rotary mixer-feeder units, means for feeding sand to both units and means for feeding liquid resin to one unit and liquid catalyst to the other, means for driving the units and means for controlling the duration of driving, separate chambers for receiving the charges from the respective units, means for closing off said chambers from the units, means for blowing the charges from said chambers into a common reaction chamber, and means for blowing the mixture formed in the reaction chamber into a core box or mould.
Claim 3
Dependent Claim
66 words
Apparatus as in claim 1, wherein each of said mixer-feeder units comprises a cylindrical housing, a rotatable shaft extending axially within the housing, and part-helical mixing and feedinG blades mounted on said shaft, and means are provided for feeding sand and either a resin or a catalyst into said casing at one end and for delivering the mixed charge from the other end of said casing.
Claim 4
Dependent Claim
48 words
Apparatus as in claim 1, wherein said means for driving the mixer-feeder units comprises an electric motor, a clutch and brake assembly driven by said motor, and belt drives from said clutch and brake assembly to reduction gear boxes and couplings between said gear boxes and said units.
Claim 5
Dependent Claim
35 words
Apparatus as in claim 1 incorporating a clutch in the means for driving said mixer-feeder units, mechanism for counting the revolutions of the units, and control means for said clutch actuated by said counting mechanism.
Claim 6
Dependent Claim
40 words
Apparatus as in claim 1, wherein said means for feeding resin and catalyst in liquid form to said mixer-feeder units comprises two variable speed positive displacement driven pumps and means for controlling the periods for which said pumps are driven.
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) | 1974-05-24 | 1974-11-23 | 1975-05-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-05-24 | 1978-11-23 | 1979-05-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-05-24 | 1982-11-23 | 1983-05-25 | $7700.00 | Window Closed / Lapsed |