Patent US3183997A successfully refreshed from Google Patents.
US3183997A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Suspended working platform unit
Assignee: Shell USA Inc
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Filing: 1963-02-07
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Granted: 1965-05-18
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Expires: 1983-02-07
Abstract
Abstract 961,811. Workmen's staging in tanks. SHELL INTERNATIONALE RESEARCH MAATSCHAPPIJ N.V. Feb. 26, 1963 [Feb. 28, 1962], No. 7700/63. Heading E1S. A workmen's platform 4 for use in a tank &c. is mounted on a pivot 5 on a vertical shaft 1 and held horizontally by a stay 6 engaging a hook 9 on the shaft which is rotatably mounted in a carrier 2 in the tank roof 3. The shaft is suspended by a rod 10 engaging in plates 11 on a plate 12 rotatable on a bearing 22 on the carrier 2. The platform is adapted to be inserted through an opening in the tank roof for suspension from the carrier 2.
Inventors
- 👤 Hendricus P Kleiss
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 20:40
CPC Classifications
E; E04; E04G; E04G3/00; E04G3/24; E04G3/246; E04G1/00; E04G1/36; B; B65; B65D; B65D90/00; E04G1/362
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
194 words
A ROTATABLE SUSPENDED WORKING PLATFORM SUPPORTED SOLELY FROM A SINGLE OVERHEAD CARRYING MEMBER AND ADAPTED FOR USE IN CLOSED TANK STRUCTURES THAT HAVE AT LEAST ONE ACCESS OPENING IN THE TOP THEREOF, COMPRISING: (A) A VERTICAL SUPPORT SHAFT; (B) A CARRYING MEMBER HAVING MEANS FOR RIGID ATTACHMENT TO THE TANK AT SAID ACCESS OPENING, FOR SUSPENDING SAID SHAFT FOR ROTATION ABOUT A VERTICAL AXIS; (C) A HORIZONTAL PLATE SURROUNDING THE SHAFT AND POSITIONED IN SUPPORTED RELATION TO SAID CARRYING MEMBER, SAID PLATE BEING MOVABLE WITH RESPECT TO THE SHAFT, AND A HORIZONTAL ROD INSERTED TRANSVERSELY THROUGH TO THE TOP PART OF THE SHAFT AND CONNECTED TO SAID PLATE IN SUPPORTED RELATION, WHEREBY THE SHAFT CAN BE LOWERED FROM THE CARRYING MEMBER BY SLIDING THROUGH SAID PLATE AFTER REMOVAL OF THE ROD; (A) A RIGID PLATFORM PIVOTALLY SECURED DIRECTLY TO THE LOWER PORTION OF SAID SHAFT TO ONE SIDE THEREOF FOR MOVEMENT ABOUT A HORIZONTAL AXIS, WHEREBY SAID PLATFORM, WITH THE SHAFT PIVOTALLY ATTACHED, CAN PASS THROUGH A NARROW OPENING WHEN THE PLATFORM IS PIVOTED UPWARDLY; AND (E) MEANS TO INTERCONNECT SAID PLATFORM AND SHAFT INTO A RIGID UNIT WHEREIN SAID PLATFORM IS SUBSTANTIALLY HORIZONTAL.
Claim 2
Dependent Claim
194 words
A ROTATABLE SUSPENDED WORKING PLATFORM SUPPORTED SOLELY FROM A SINGLE OVERHEAD CARRYING MEMBER AND ADAPTED FOR USE IN CLOSED TANK STRUCTURES THAT HAVE AT LEAST ONE ACCESS OPENING IN THE TOP THEREOF, COMPRISING: (A) A VERTICAL SUPPORT SHAFT; (B) A CARRYING MEMBER HAVING MEANS FOR RIGID ATTACHMENT TO THE TANK AT SAID ACCESS OPENING, FOR SUSPENDING SAID SHAFT FOR ROTATION ABOUT A VERTICAL AXIS; (C) A HORIZONTAL PLATE SURROUNDING THE SHAFT AND POSITIONED IN SUPPORTED RELATION TO SAID CARRYING MEMBER, SAID PLATE BEING MOVABLE WITH RESPECT TO THE SHAFT, AND A HORIZONTAL ROD INSERTED TRANSVERSELY THROUGH TO THE TOP PART OF THE SHAFT AND CONNECTED TO SAID PLATE IN SUPPORTED RELATION, WHEREBY THE SHAFT CAN BE LOWERED FROM THE CARRYING MEMBER BY SLIDING THROUGH SAID PLATE AFTER REMOVAL OF THE ROD; (A) A RIGID PLATFORM PIVOTALLY SECURED DIRECTLY TO THE LOWER PORTION OF SAID SHAFT TO ONE SIDE THEREOF FOR MOVEMENT ABOUT A HORIZONTAL AXIS, WHEREBY SAID PLATFORM, WITH THE SHAFT PIVOTALLY ATTACHED, CAN PASS THROUGH A NARROW OPENING WHEN THE PLATFORM IS PIVOTED UPWARDLY; AND (E) MEANS TO INTERCONNECT SAID PLATFORM AND SHAFT INTO A RIGID UNIT WHEREIN SAID PLATFORM IS SUBSTANTIALLY HORIZONTAL.
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) | 1968-05-17 | 1968-11-16 | 1969-05-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-05-17 | 1972-11-16 | 1973-05-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-05-17 | 1976-11-16 | 1977-05-18 | $7700.00 | Window Closed / Lapsed |