US3934374A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Sand reclamation system
Assignee: Wheelabrator Corp
•
Filing: 1974-08-21
•
Granted: 1976-01-27
•
Expires: 1994-08-21
Abstract
Abstract A sand reclamation system is disclosed for reconditioning and sizing sand utilized in precision molding. The system includes particulate blasting wheels for breaking down the sand molds and reducing them to discrete particles. A conveyor, a first air wash for separating the particulate used for blasting from the granular sand and a second special air wash for separating undersized sand particles from those which may be reused for further molding. The second air wash utilizes a modified air wash separator employing a surge bypass arrangement to insure a constant feed rate therethrough.
Inventors
- 👤 Raymond M. Leliaert
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 10:52
CPC Classifications
B; B24; B24C; B24C9/00; B24C9/006; Y; Y02; Y02P; Y02P70/00; Y02P70/10
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
156 words
A sand reclamation system for breaking sand molds into discrete particles for reuse and for maintaining a selected minimum particle size, comprising: a. a blast chamber receiving said molds for confining the blast therein; b. means for throwing particulate at said molds to break them down into discrete particles; c. means for conveying the spent particulate and sand particles from said blast chamber; d. a first air wash separator for separating said sand particles from said particulate; and e. a second air wash separator for separating sand particles to remove particles which are smaller than said selected minimum size, said second separator including counterweight means for maintaining a minimum flow rate through said separator and bypass means for returning excessive amounts of sand to said blast chamber to limit the flow rate of sand into said second separator, thereby to obtain a relatively constant volume of sand particles through said second separator to obtain precise separation
Claim 2
Dependent Claim
156 words
A sand reclamation system for breaking sand molds into discrete particles for reuse and for maintaining a selected minimum particle size, comprising: a. a blast chamber receiving said molds for confining the blast therein; b. means for throwing particulate at said molds to break them down into discrete particles; c. means for conveying the spent particulate and sand particles from said blast chamber; d. a first air wash separator for separating said sand particles from said particulate; and e. a second air wash separator for separating sand particles to remove particles which are smaller than said selected minimum size, said second separator including counterweight means for maintaining a minimum flow rate through said separator and bypass means for returning excessive amounts of sand to said blast chamber to limit the flow rate of sand into said second separator, thereby to obtain a relatively constant volume of sand particles through said second separator to obtain precise separation
Claim 3
Dependent Claim
11 words
The system according to claim 1 wherein the means for throwing
Claim 4
Dependent Claim
24 words
The system according to claim 1 wherein said first air wash separator is provided with bypass means for returning excessive amounts of sand and
Claim 5
Dependent Claim
28 words
The system according to claim 1 wherein said particulate if ferromagnetic material and said system further includes: means receiving the sand from said classifying means for removing any
Claim 6
Dependent Claim
12 words
The device according to claim 4 wherein said receiving means is a
Claim 7
Dependent Claim
41 words
The device according to claim 1 wherein said conveying means includes at least one screw conveyor in said blast chamber, a belt and bucket elevator receiving the sand and particulate from said screw conveyor and carrying it to said separating means.
References Cited (Backward Citations)
US2452362A
Cited
US3005547A
Cited
US3716946A
Cited
US3690066A
Cited
US3694964A
Cited
US3782643A
Cited
US3742650A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1979-01-26 | 1979-07-28 | 1980-01-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-01-26 | 1983-07-28 | 1984-01-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-01-26 | 1987-07-28 | 1988-01-27 | $7700.00 | Window Closed / Lapsed |