US3568420A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Hydraulic lifting apparatus for the cutting platform of harvesting machinery
Assignee: Robert Bosch GmbH
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Filing: 1968-12-23
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Granted: 1971-03-09
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Expires: 1988-12-23
Abstract
Abstract A LINKAGE WHICH INTERCONNECTS THE HYDRAULIC CONTROL, THE CUTTING PLATFORM, AND A MANUAL SETTING LEVER, TO SET CUTTING PLATFORM HEIGHT OVER GROUND LEVEL, INCLUDES A FIRST VARIABLE LINK ELEMENT CHANGEABLE IN LENGTH IN RESPONSE TO PRESSURE CHANGES IN THE HYDRAULIC LIFTING CYLINDER FOR THE CUTTING PLATFORM, AND A SECOND LINK ELEMENT RESPONSIVE TO THE POSITION OF THE CUTTING PLATFORM WITH RESPECT TO THE MACHINE, SO THAT THE CUTTING PLATFORM WILL BE AT EVEN HEIGHT ABOVE GROUND LEVEL REGARDLESS OF WEIGHT ON THE CUTTING PLATFORM AND UNDULATIONS IN GROUND LEVEL.
Inventors
- 👤 Friedrich-Wilheim Hofer
- 👤 Gerhard Nonnenmacher
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 05:14
CPC Classifications
A; A01; A01D; A01D41/00; A01D41/12; A01D41/14; A01D41/141; A01D34/00; A01D34/01; A01D34/02; A01D34/24; A01D34/246; A01D41/145
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) | 1974-03-08 | 1974-09-07 | 1975-03-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-03-08 | 1978-09-07 | 1979-03-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-03-08 | 1982-09-07 | 1983-03-09 | $7700.00 | Window Closed / Lapsed |