US3130981A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Differential steering apparatus
Assignee: Doosan Bobcat North America Inc
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Filing: 1962-06-18
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Granted: 1964-04-28
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Expires: 1982-06-18
Abstract
No abstract record available.
Inventors
- 👤 John C Christenson
- 👤 David H Link
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 23:38
CPC Classifications
B; B62; B62D; B62D7/00; B62D7/02; B66; B66F; B66F9/00; B66F9/06; B66F9/075; B66F9/12; B66F9/122
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
176 words
DIFFERENTIAL STEERING MECHANISM FOR A NARROW-AISLE TRUCK OR THE LIKE HAVING A PAIR OF LATERALLY SPACED STEERABLE GROUND-ENGAGING WHEELS EACH ROTATABLE ABOUT A VERTICAL SWIVEL AXIS FOR TURNING OF THE TRUCK, COMPRISING FIRST AND SECOND SPROCKET WHEELS EACH ROTATABLE ON SAID VERTICAL AXIS OF ONE OF SAID STEERABLE WHEELS AND OPERATIVELY CONNECTED THERETO FOR DIRECTIONAL TURNING OF THE WHEEL, A CAM ON THE FIRST SPROCKET WHEEL HAVING AN INTERMEDIATE POINT CORRESPONDING TO STRAIGHT-AHEAD POSITION OF THE STEERABLE WHEELS, A CARRIER, A PAIR OF IDLER SPROCKETS ON SAID CARRIER IN FIXEDLY SPACED RELATION TO EACH OTHER, MEANS MOUNTING THE CARRIER FOR RECTILINEAR RECIPROCATION TRANSVERSELY OF THE COMMON PLANE OF THE SPROCKET WHEEL AXES, A LEVER PIVOTED INTERMEDIATE ITS ENDS ON THE TRUCK, A CAM FOLLOWER ON ONE END OF SAID LEVER ENGAGING SAID CAM, MEANS CONNECTING THE CARRIER TO THE OTHER END OF THE LEVER FOR RECIPROCATION THEREBY, A SPROCKET CHAIN REEVED ABOUT THE FIRST AND SECOND SPROCKET WHEELS WITH ONE RUN ALSO REEVED ABOUT ONE OF SAID PAIR OF IDLER SPROCKETS AND THE OTHER RUN ALSO
Claim 2
Dependent Claim
176 words
DIFFERENTIAL STEERING MECHANISM FOR A NARROW-AISLE TRUCK OR THE LIKE HAVING A PAIR OF LATERALLY SPACED STEERABLE GROUND-ENGAGING WHEELS EACH ROTATABLE ABOUT A VERTICAL SWIVEL AXIS FOR TURNING OF THE TRUCK, COMPRISING FIRST AND SECOND SPROCKET WHEELS EACH ROTATABLE ON SAID VERTICAL AXIS OF ONE OF SAID STEERABLE WHEELS AND OPERATIVELY CONNECTED THERETO FOR DIRECTIONAL TURNING OF THE WHEEL, A CAM ON THE FIRST SPROCKET WHEEL HAVING AN INTERMEDIATE POINT CORRESPONDING TO STRAIGHT-AHEAD POSITION OF THE STEERABLE WHEELS, A CARRIER, A PAIR OF IDLER SPROCKETS ON SAID CARRIER IN FIXEDLY SPACED RELATION TO EACH OTHER, MEANS MOUNTING THE CARRIER FOR RECTILINEAR RECIPROCATION TRANSVERSELY OF THE COMMON PLANE OF THE SPROCKET WHEEL AXES, A LEVER PIVOTED INTERMEDIATE ITS ENDS ON THE TRUCK, A CAM FOLLOWER ON ONE END OF SAID LEVER ENGAGING SAID CAM, MEANS CONNECTING THE CARRIER TO THE OTHER END OF THE LEVER FOR RECIPROCATION THEREBY, A SPROCKET CHAIN REEVED ABOUT THE FIRST AND SECOND SPROCKET WHEELS WITH ONE RUN ALSO REEVED ABOUT ONE OF SAID PAIR OF IDLER SPROCKETS AND THE OTHER RUN ALSO
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1967-04-28 | 1967-10-28 | 1968-04-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1971-04-28 | 1971-10-28 | 1972-04-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1975-04-28 | 1975-10-28 | 1976-04-28 | $7700.00 | Window Closed / Lapsed |