Patent US3761218A successfully refreshed from Google Patents.
US3761218A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Apparatus for molding thin layers
Assignee: Rio Tinto France SAS
•
Filing: 1972-07-31
•
Granted: 1973-09-25
•
Expires: 1992-07-31
Abstract
Abstract The invention is applied to the molding of articles having thin walls and in particular to the molding of radiator elements, caps, cases, frames, pipe members, cylinder heads, in which the molding apparatus comprises a mold which is open at its lower end, a compression chamber having two cavities connected at their upper portion respectively to the opening of the mold and to a source of compressed gas, and at their lower portion to a delivery conduit and a furnace into the bath of molten material in which the delivery conduit dips and which can be put under gas pressure by a pipe member.
Inventors
- 👤 R Portalier
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 19:59
CPC Classifications
B; B22; B22D; B22D18/00; B22D18/04
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
355 words
Apparatus for molding thin layers, which permits a precise control of the heat exchange between a liquid material and the walls of a mold, and which lends itself to automation, the apparatus comprising a mold which is open at its lower end and which is provided in its upper portion with a device for the discharge of gas, and at least one cooling means within its walls, a closed low-pressure casting furnace and a crucible therein for containing a fusion bath, and in which the internal volume above the crucible is adapted to be occupied by a gas under pressure, said furnace being placed below the lower opening of the mold, characterized by a compression chamber positioned between the mold and the furnace and comprising two cavities and connected at their upper ends respectively to the lower opening of the mold and a pipe member which extends laterally out of the chamber, the lower ends of the cavities being connected together, a delivery conduit which connects with the cavities and extends into the furnace end of which the lower end dips into the bath, and further characterized by a valve comprising at least four pipe members of which a first is connected to a source of compressed gas, a second is connected to the gas volume of the furnace, a third is connected to the lateral pipe member issuing from the compression chamber, and finally a fourth is in communication with the atmosphere, and at least one movable member which, during a first machine stopped phase, closes all the pipe members, during a second phase of filling the mold with the liquid material from the furnace connects the first pipe member to the second, then, during a third phase of solidification of the layer against the wall of the mold and discharge of the excess of liquid material from the mold to the furnace, connects the second pipe member to the third pipe member and finally, during a fourth phase of bringing to atmospheric pressure the assembly comprising the mold, the compression chamber and the furnace, connects together the second, third and fourth pipe members.
Claim 2
Dependent Claim
355 words
Apparatus for molding thin layers, which permits a precise control of the heat exchange between a liquid material and the walls of a mold, and which lends itself to automation, the apparatus comprising a mold which is open at its lower end and which is provided in its upper portion with a device for the discharge of gas, and at least one cooling means within its walls, a closed low-pressure casting furnace and a crucible therein for containing a fusion bath, and in which the internal volume above the crucible is adapted to be occupied by a gas under pressure, said furnace being placed below the lower opening of the mold, characterized by a compression chamber positioned between the mold and the furnace and comprising two cavities and connected at their upper ends respectively to the lower opening of the mold and a pipe member which extends laterally out of the chamber, the lower ends of the cavities being connected together, a delivery conduit which connects with the cavities and extends into the furnace end of which the lower end dips into the bath, and further characterized by a valve comprising at least four pipe members of which a first is connected to a source of compressed gas, a second is connected to the gas volume of the furnace, a third is connected to the lateral pipe member issuing from the compression chamber, and finally a fourth is in communication with the atmosphere, and at least one movable member which, during a first machine stopped phase, closes all the pipe members, during a second phase of filling the mold with the liquid material from the furnace connects the first pipe member to the second, then, during a third phase of solidification of the layer against the wall of the mold and discharge of the excess of liquid material from the mold to the furnace, connects the second pipe member to the third pipe member and finally, during a fourth phase of bringing to atmospheric pressure the assembly comprising the mold, the compression chamber and the furnace, connects together the second, third and fourth pipe members.
Claim 3
Dependent Claim
13 words
Apparatus as claimed in claim 1 in which the delivery conduit is oblique.
Claim 4
Dependent Claim
13 words
Apparatus as claimed in claim 1 in wHich the delivery conduit is vertical.
Claim 5
Dependent Claim
25 words
Apparatus as claimed in claim 1 in which the compression chamber comprises a chamber body proper and a base portion which carries the delivery conduit.
Claim 6
Dependent Claim
33 words
Apparatus as claimed in claim 1 in which the compression chamber comprises heating means permitting it to be raised to a temperature higher than that of the liquid material which passes through it.
Claim 7
Dependent Claim
20 words
Apparatus as claimed in claim 1 in which the two cavities of the compression chamber are of substantially equal volumes.
Claim 8
Dependent Claim
37 words
Apparatus as claimed in claim 1 in which the aperture by way of which the two cavities are in communication at their lower ends, is of a section substantially equal to the that of the delivery conduit.
Claim 9
Dependent Claim
51 words
Apparatus as claimed in claim 1 in which the cavity of the compression chamber is provided, in its upper portion connected to the lateral pipe member and below the outlet of the pipe member, with a safety device for stopping injection of gas when the liquid material reaches a given level.
Claim 10
Dependent Claim
46 words
Apparatus as claimed in claim 8 in which the cavity connected to the lateral pipe member is of conical shape and its volume is such that, when the mold is full, the surface of the liquid material lies below the level detected by the safety device.
References Cited (Backward Citations)
US1013548A
Cited
US1282963A
Cited
US2210544A
Cited
US2209882A
Cited
US2997756A
Cited
US2867869A
Cited
US3283372A
Cited
US3268960A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-09-24 | 1977-03-26 | 1977-09-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-09-24 | 1981-03-26 | 1981-09-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-09-24 | 1985-03-26 | 1985-09-25 | $7700.00 | Window Closed / Lapsed |