US3883049A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Piston-type valve for melting furnaces
Assignee: MPH Industries Inc
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Filing: 1973-09-14
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Granted: 1975-05-13
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Expires: 1993-09-14
Abstract
Abstract A method and mechanism for controlling the transfer and retention of flowable material, such as molten metal, from a melting furnace. A block having two passages is affixed in the furnace wall. The first vertically-oriented passage accommodates a movable piston mechanism. A second tapered passage communicates with its smaller end to the first passage, with its larger end to the exterior of the furnace. When the piston mechanism is raised, a flow path is opened for the molten metal to pass up through the first passage and then through the second passage for use at the exterior of the furnace, such as in a pouring spout. In the closed position, piston rings seal from above and below the common line of intersection between the first and second passages.
Inventors
- 👤 John Mccarthy
- 👤 Keith Paul
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 00:21
CPC Classifications
F; F27; F27D; F27D3/00; F27D3/14; Y; Y10; Y10T; Y10T137/00; Y10T137/598; Y10T137/612; Y10T137/6144
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
294 words
An apparatus for selectively controlling the transfer and retention of flowable material, comprising, in combination: first means for containing said flowable material; second means connected to said first means for providing a flow path between the interior and the exterior of said first means for said flowable material; third means, at least a portion of which is contiguous with said second means for selectively opening and blocking said flow path for said flowable material; and wherein: said first means for containing said flowable material comprises a furnace; said flowable material comprises molten metal; said second means comprises a heat treated steel block having the general shape of a rectangular parallelepiped, and being provided therein with first and second passages in communication with each other which form said flow path between the interior and the exterior of said furnace; said second means being disposed within a wall of said furnace at a position which is normally below the uppermost level of the molten metal in said furnace so that when said third means have selectively opened said flow path, said molten metal may flow into said first passage and then pass into said second passage for transfer to the exterior of said furnace; said first passage having a central longitudinal axis which is disposed substantially perpendicular to the central longitudinal axis of said second passage; said third means includes a piston mechanism which moves in response to an operator''s lever in conjunction with a counterweight device; said piston mechanism being disposed, dimensioned and arranged to move within said first passage, and being provided with at least two piston rings which are spaced apart by a distance which is greater than the largest diameter of the common line of intersection between said first and second passages.
Claim 2
Independent Claim
294 words
An apparatus for selectively controlling the transfer and retention of flowable material, comprising, in combination: first means for containing said flowable material; second means connected to said first means for providing a flow path between the interior and the exterior of said first means for said flowable material; third means, at least a portion of which is contiguous with said second means for selectively opening and blocking said flow path for said flowable material; and wherein: said first means for containing said flowable material comprises a furnace; said flowable material comprises molten metal; said second means comprises a heat treated steel block having the general shape of a rectangular parallelepiped, and being provided therein with first and second passages in communication with each other which form said flow path between the interior and the exterior of said furnace; said second means being disposed within a wall of said furnace at a position which is normally below the uppermost level of the molten metal in said furnace so that when said third means have selectively opened said flow path, said molten metal may flow into said first passage and then pass into said second passage for transfer to the exterior of said furnace; said first passage having a central longitudinal axis which is disposed substantially perpendicular to the central longitudinal axis of said second passage; said third means includes a piston mechanism which moves in response to an operator''s lever in conjunction with a counterweight device; said piston mechanism being disposed, dimensioned and arranged to move within said first passage, and being provided with at least two piston rings which are spaced apart by a distance which is greater than the largest diameter of the common line of intersection between said first and second passages.
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) | 1978-05-12 | 1978-11-11 | 1979-05-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-05-12 | 1982-11-11 | 1983-05-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-05-12 | 1986-11-11 | 1987-05-13 | $7700.00 | Window Closed / Lapsed |