Patent US3764078A successfully refreshed from Google Patents.
US3764078A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Apparatus for regenerating foundry sand
Assignee: APPLIC PROD IND
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Filing: 1971-11-30
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Granted: 1973-10-09
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Expires: 1991-11-30
Abstract
Abstract Apparatus for the regeneration of foundry sand, particularly sand coated with irreversible inorganic and/or organic binding agents. The sand molds are broken to free the castings and the lumps of hot sand crushed and cooled to ambient temperature. The grains of sand are then separated from the coating of binder and sieved to obtain a selected range of grain sizes equivalent to that of suitable new foundry sand. Grains of sand of excessive size may be pulverised and returned for re-processing. Dust is removed from the sand at one or more of the stages of the process where dust is caused to form. Castings are recovered from the mold fragments by a magnetic or electronic separator.
Inventors
- 👤 Richard
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 07:18
CPC Classifications
B; B02; B02C; B02C19/00; B02C19/06; Y; Y10; Y10S; Y10S241/00; Y10S241/10
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
174 words
Apparatus for the regeneration of foundry sand, particularly sand coated with irreversible inorganic and/or organic binding agents, comprising means for breaking sand molds to remove the castings therefrom, means for crushing the hot lumps of sand, cooling apparatus for cooling the crushed sand to ambient temperature, separating means for separating the grains of sand from their coating of binding agent, the said separating means comprising a hermetically sealed casing with a vertical axis of symmetry, and means for directing at least one blast of fluid horizontally within the casing whereby sand falling through the casing is projected against the lateral walls of the said casing until the matrix of the binding agent is caused to burst, screening means for submitting the separated sand to granulometric selection by at least two screens of different mesh sizes to obtain a granulometric range equivalent to that desired of a new foundry sand, and means for removing dust from the sand in at least one of said crushing, separating and screening means where dust is caused to form.
Claim 2
Dependent Claim
174 words
Apparatus for the regeneration of foundry sand, particularly sand coated with irreversible inorganic and/or organic binding agents, comprising means for breaking sand molds to remove the castings therefrom, means for crushing the hot lumps of sand, cooling apparatus for cooling the crushed sand to ambient temperature, separating means for separating the grains of sand from their coating of binding agent, the said separating means comprising a hermetically sealed casing with a vertical axis of symmetry, and means for directing at least one blast of fluid horizontally within the casing whereby sand falling through the casing is projected against the lateral walls of the said casing until the matrix of the binding agent is caused to burst, screening means for submitting the separated sand to granulometric selection by at least two screens of different mesh sizes to obtain a granulometric range equivalent to that desired of a new foundry sand, and means for removing dust from the sand in at least one of said crushing, separating and screening means where dust is caused to form.
Claim 3
Dependent Claim
92 words
Apparatus as claimed in claim 1, further including a secondary crushing apparatus, at least one tubular conduit for conveying grains of sand of excessive size rejected by said screening means into said secondary crushing apparatus wherein the dimensions of the grains of excessive size are reduced and their coating of binding agent caused to burst, and means to enable the grains of sand subjected to the secondary crushing apparatus to be re-cycled together with those emanating from the cooling apparatUs whereby grains from both sources are conveyed rogether towards the separating means.
Claim 4
Dependent Claim
50 words
Apparatus as claimed in claim 1, wherein there is provided upstream of the cooling apparatus at least one separator for separating metallic particles from the sand, said separator being either of the magnetic type for the ferrous metals, or of the electronic type for the non-ferrous metals and non-magnetic alloys.
Claim 5
Dependent Claim
150 words
Apparatus as claimed in claim 1, wherein at least one horizontally disposed conduit extends through the hermetrically sealed casing, each conduit being connectable to a source of gas under pressure and having an orifice whereby at least one horizontal current of gas can be projected at considerable pressure from each conduit in a direction substantially perpendicular to the axis of symmetry of the casing, said separating means further comprising a set of internal baffles mounted on the wall of the casing and on which grains of sand slide evenly from the wall towards the centre of the casing, and a cap mounted above each pressure gas conduit and of which the lower edge contacts the plane in which the current of gas issues from the orifice, whereby grains of sand which drop by force of gravity and slide along the said cap are immediately re-introduced into the current of gas.
Claim 6
Dependent Claim
33 words
Apparatus as claimed in claim 4, wherein the separating means further comprises at least one atomizer for spraying a volatile liquid to cool the grains of sand as they enter the separating means.
Claim 7
Dependent Claim
41 words
Apparatus as claimed in claim 5, wherein the atomizer is provided with means for regulating the rate of delivery of the volatile liquid, whereby the quantity thereof can be adjusted according to the temperature of the sand entering the separating means.
Claim 8
Dependent Claim
35 words
Apparatus as claimed in claim 1, including a storage hopper for storing the grains of sand of acceptable size, the storage hopper being connected to a pneumatic conveying device for conveying the grains of sand.
Claim 9
Dependent Claim
42 words
Apparatus as claimed in claim 1, further comprising a recuperation hopper for the recuperation and storage of the grains of sand of excessive size, the recuperation hopper being connected to the screen of the larger grain size by means of a conduit.
Claim 10
Dependent Claim
93 words
Apparatus as claimed in claim 1, wherein the dust removal means consists of a chamber with a vertical axis of symmetry, the chamber being provided with an air intake orifice at the bottom thereof and with an outlet orifice at the top thereof for the evacuation of the air contaminated with dust, the finest grains of sand and the particles of binding agent detached from the grains of sand, means being provided to connect the said chamber to one or more of the units of the apparatus where the sand undergoes mechanical treatment.
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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) | 1976-10-08 | 1977-04-09 | 1977-10-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-10-08 | 1981-04-09 | 1981-10-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-10-08 | 1985-04-09 | 1985-10-09 | $7700.00 | Window Closed / Lapsed |