Patent US4040472A successfully refreshed from Google Patents.
US4040472A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Casting mould advancing plant
Assignee: Dansk Industri Syndikat AS
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Filing: 1976-09-17
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Granted: 1977-08-09
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Expires: 1996-09-17
Abstract
Abstract A casting mould consisting of closely collected uniform mould parts is advanced stepwise on a conveyor path by a main piston, exerting an endwise pressure on the endmost mould part, and by an auxiliary mould advancing device incorporating a hydraulic cylinder, the piston of which is greater than said main piston. Hydraulic fluid displaced by the main piston is supplied to the hydraulic cylinder together with additional hydraulic fluid admitted through a differential pressure valve responding on the pressure difference between the two sides of the main piston.
Inventors
- 👤 Henning Borge Lundsgart
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 16:43
CPC Classifications
B; B22; B22D; B22D33/00; B22D33/005
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
168 words
A plant for stepwise advancing a casting mould comprising uniform mould parts which are closely piled together on a conveyor path having a preparatory section where the mould parts are successively added to the already existing casting mould by means of a hydraulically operated main piston, followed by pouring, solidification and cooling sections, of which at least the last-mentioned section includes a mould advancing device which during the advance steps is moved synchroneously with the main piston by means of at least one hydraulic unit fed with hydraulic liquid displaced by the main piston, wherein the hydraulic unit of the mould advancing device is a hydraulic cylinder with a piston, the effective area of which exceeds the effective displacement area of the main piston, said cylinder being connected to the main pump of the plant via a pipe including a differential pressure valve for supplying additional hydraulic liquid to the hydraulic cylinder when the pressure difference between the two sides of the main piston exceeds a preset value.
Claim 2
Dependent Claim
168 words
A plant for stepwise advancing a casting mould comprising uniform mould parts which are closely piled together on a conveyor path having a preparatory section where the mould parts are successively added to the already existing casting mould by means of a hydraulically operated main piston, followed by pouring, solidification and cooling sections, of which at least the last-mentioned section includes a mould advancing device which during the advance steps is moved synchroneously with the main piston by means of at least one hydraulic unit fed with hydraulic liquid displaced by the main piston, wherein the hydraulic unit of the mould advancing device is a hydraulic cylinder with a piston, the effective area of which exceeds the effective displacement area of the main piston, said cylinder being connected to the main pump of the plant via a pipe including a differential pressure valve for supplying additional hydraulic liquid to the hydraulic cylinder when the pressure difference between the two sides of the main piston exceeds a preset value.
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) | 1980-08-08 | 1981-02-07 | 1981-08-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-08-08 | 1985-02-07 | 1985-08-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-08-08 | 1989-02-07 | 1989-08-09 | $7700.00 | Window Closed / Lapsed |