US3621756A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Load balancer
Assignee: Ingersoll Rand Co
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Filing: 1969-05-20
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Granted: 1971-11-23
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Expires: 1989-05-20
Abstract
Abstract A LOAD BALANCER ADAPTED TO BE SUSPENDED FROM A HOIST AND TO SUPPORT A LOAD IN A FLOATING BALANCED MANNER. THE LOAD BALANCER CONTAINS A PNEUMATIC CHAMBER AND AN VALVE MEANS FOR AUTOMATICALLY ADMITTING PNEUMATIC PRESSURE INTO AND EXHAUSTING IT FROM THE CHAMBER TO AUTOMATICALLY MAINTAIN THE BALANCER PISTON IN A POSITION RELATIVE TO THE CHAMBER INTERMEDIATE THE ENDS OF ITS TRAVEL STROKE. A BRAKE GRIPS THE PISTON TO RESTRICT ITS SPEED OF TRAVEL TO PREVENT ITS OSCILLATION AND THIS BRAKE GRIPS THE PISTON PROGRESSIVELY TIGHTER AS THE PRESSURE IN THE PNEUMATIC CHAMBER INCREASES.
Inventors
- 👤 Otmar M Ulbing
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 19:36
CPC Classifications
B; B66; B66F; B66F3/00; B66F3/24; B66F3/242
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-11-22 | 1975-05-24 | 1975-11-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-11-22 | 1979-05-24 | 1979-11-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-11-22 | 1983-05-24 | 1983-11-23 | $7700.00 | Window Closed / Lapsed |