US3913756A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Ladle skimmer
Assignee: Grant Louis A Inc
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Filing: 1974-02-11
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Granted: 1975-10-21
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Expires: 1994-02-11
Abstract
Abstract The specification discloses a skimming mechanism used in steel mills for removing slag from the surface of the molten metal in a ladle, the mechanism comprising an extensible boom assembly pivotally mounted on a turntable and power means arranged for rotating the turntable and for pivotally moving the boom assembly in a vertical plane relative to the turntable. The boom assembly comprises telescoping tubular sections, adjustable anti-friction means supporting the inner tubular section within the outer tubular section, a power-actuated driving mechanism comprising cooperating sprocket wheels and roller chains for extending and retracting the inner boom section with respect to the outer boom section, and a skimming paddle comprising a scoop portion separably attached to a mounting bracket portion that is mounted on the outer end of the inner boom section.
Inventors
- 👤 George E Barron
- 👤 Harry Pavone
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 18:12
CPC Classifications
C; C21; C21C; C21C5/00; C21C5/28; C21C5/42; C21C5/46; F; F27; F27D; F27D3/00; F27D3/15; F27D3/1545; F27D3/1554; F27D3/1563
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
200 words
In a skimming mechanism having a supporting structure, a boom assembly movably mounted on said structure, said boom assembly having telescoping outer and inner boom sections, anti-friction means guidably supporting said inner boom section for reciprocative movement within said outer boom section, a skimming paddle carried on the forward end of said inner boom section, and power drive means for effecting reciprocative movement of said inner boom section within said outer boom section, the improvement comprising a pair of cushioning cylinders fixed externally at the front end of said outer boom section, one of said cylinders having a forwardly projecting piston rod and the other of said cylinders having a rearwardly projecting piston rod, rod means on said inner boom section in coaxial alignment with the piston rod of said one cylinder engageable therewith adjacent the extremity of retraction of said inner boom section to define the limit of retractive movement thereof, and means including means fixed on said inner boom section adjacent the rear end thereof for cooperatively engaging the rearwardly projecting piston rod of said other cylinder adjacent the extremity of extension of the inner boom section to define the limit of extension of the inner boom section.
Claim 2
Dependent Claim
200 words
In a skimming mechanism having a supporting structure, a boom assembly movably mounted on said structure, said boom assembly having telescoping outer and inner boom sections, anti-friction means guidably supporting said inner boom section for reciprocative movement within said outer boom section, a skimming paddle carried on the forward end of said inner boom section, and power drive means for effecting reciprocative movement of said inner boom section within said outer boom section, the improvement comprising a pair of cushioning cylinders fixed externally at the front end of said outer boom section, one of said cylinders having a forwardly projecting piston rod and the other of said cylinders having a rearwardly projecting piston rod, rod means on said inner boom section in coaxial alignment with the piston rod of said one cylinder engageable therewith adjacent the extremity of retraction of said inner boom section to define the limit of retractive movement thereof, and means including means fixed on said inner boom section adjacent the rear end thereof for cooperatively engaging the rearwardly projecting piston rod of said other cylinder adjacent the extremity of extension of the inner boom section to define the limit of extension of the inner boom section.
Claim 3
Dependent Claim
107 words
A skimming mechanism according to claim 1, wherein said means comprises a lug fixed adjacent the rear end of said inner boom section and a Z-bar slidably mounted in a slot in the side walls of the outer boom section, the inner end of said Z-bar being engaged by the said lug and the outer end engageable with the rearwardly projecting end of the piston rod of the other of said cylinders adjacent the outer extremity of travel of the inner boom section, and wherein means is provided for biasing said Z-bar toward the rear extremity of the slot in the wall of the outer boom section.
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) | 1978-10-20 | 1979-04-21 | 1979-10-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-10-20 | 1983-04-21 | 1983-10-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-10-20 | 1987-04-21 | 1987-10-21 | $7700.00 | Window Closed / Lapsed |