US3862719A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Ball mill for treating used casting sand
Assignee: Individual
•
Filing: 1973-05-03
•
Granted: 1975-01-28
•
Expires: 1993-05-03
Abstract
Abstract A ball mill for treating and washing used casting sand has a drum that includes an interior and exterior wall. The space between these interior and exterior walls form an intermediate chamber. Disposed along the exterior wall is a screen through which passes the treated sand. The drum may be positioned on an inclination with repect to the horizontal and has contained within its interior a plurality of mill balls. Feeding means are placed at, and comprise one end of the drum. The feeding means are placed so as to be concentric about the central longitudinal axis of the drum. Means are placed within the intermediate chamber to subdivide it into compartments. A continuously operating discharge means is disposed at, and comprises the other end of the drum so that the metallic residue of the casting sand migrates towards the discharge means and exits thereat as the drum revolves.
Inventors
- 👤 Karl A Muller
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 01:31
CPC Classifications
B; B22; B22C; B22C5/00; B22C5/06; B22C5/04; Y; Y10; Y10S; Y10S241/00; Y10S241/10
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
133 words
A ball mill for recovering sand from a charge of used casting sand containing metallic residue comprising: a drum having an interior wall and an exterior wall forming an intermediate chamber therebetween, the exterior wall including a screen through which sand is screened while continuously leaving said drum as recovered sand; a plurality of mill balls located within the interior wall of said drum; feeding means disposed at one end of said drum; means for longitudinally subdividing the intermediate chamber; means responsive to the rotation of said drum, for transporting said charge toward the end of said drum opposite to said feeding means; and coNtinuously operating discharge means disposed at said opposite end of the drum and provided with openings sized to permit the discharge of said metallic residue while retaining said balls.
Claim 2
Dependent Claim
133 words
A ball mill for recovering sand from a charge of used casting sand containing metallic residue comprising: a drum having an interior wall and an exterior wall forming an intermediate chamber therebetween, the exterior wall including a screen through which sand is screened while continuously leaving said drum as recovered sand; a plurality of mill balls located within the interior wall of said drum; feeding means disposed at one end of said drum; means for longitudinally subdividing the intermediate chamber; means responsive to the rotation of said drum, for transporting said charge toward the end of said drum opposite to said feeding means; and coNtinuously operating discharge means disposed at said opposite end of the drum and provided with openings sized to permit the discharge of said metallic residue while retaining said balls.
Claim 3
Dependent Claim
60 words
A ball mill as recited in claim 1 wherein the interior wall comprises a plurality of elongated inner bars disposed concentric to and about the central longitudinal axis of said drum, said plurality of inner bars disposed so as to define a plurality of slots disposed between adjacent edges of said inner bars for allowing the sand to pass therebetween.
Claim 4
Dependent Claim
61 words
A ball mill as recited in claim 3 wherein said means for longitudinally subdividing comprises a plurality of rings placed within the intermediate chamber formed between the interior and exterior walls and residing on the periphery of said plurality of inner bars, said rings subdividing the intermediate chamber into a plurality of intermediate screen chambers allowing the sand to pass therethrough.
Claim 5
Dependent Claim
53 words
A ball mill as recited in claim 4 and further comprising a plurality of helically-disposed guide pieces on the inside surfaces of said plurality of inner bars and wherein said drum is horizontally mounted so that as the drum rotates said plurality of helically-disposed guide pieces transport said charge towards said discharge means.
Claim 6
Dependent Claim
32 words
A ball mill as recited in claim 5 wherein said feeding means comprises a hollow shaft communicating with the interior of said drum and through which the used casting sand is fed.
Claim 7
Dependent Claim
40 words
A ball mill as recited in claim 5 wherein said plurality of inner bars is constructed and arranged to provide openings located within said discharge means and said openings are sized for passing said metallic residue while retaining said balls.
Claim 8
Dependent Claim
100 words
A ball mill as recited in claim 4 wherein said discharge means comprises: a circular plate included within the interior diameter of said plurality of inner bars; a plurality of support brackets placed within said discharge means and securing said plate so that the face of said plate is perpendicular to and concentric with the central longitudinal axis of said drum thereby defining an annular gap; and jacket means disposed about said periphery of brackets and said plate so that as the metallic residue migrates through the annular gap it drops into said jacket means and exits the ball mill.
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) | 1978-01-27 | 1978-07-29 | 1979-01-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-01-27 | 1982-07-29 | 1983-01-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-01-27 | 1986-07-29 | 1987-01-28 | $7700.00 | Window Closed / Lapsed |