US3122246A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Hydraulic circuit for tractor mounted loaders
Assignee: Caterpillar Inc
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Filing: 1960-11-09
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Granted: 1964-02-25
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Expires: 1980-11-09
Abstract
No abstract record available.
Inventors
- 👤 Allan L Freedy
- 👤 Robert G Mcindoo
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 22:18
CPC Classifications
E; E02; E02F; E02F9/00; E02F9/20; E02F9/22; E02F9/2217; E02F3/00; E02F3/04; E02F3/28; E02F3/36; E02F3/42; E02F3/422; E02F9/2203; E02F9/2207
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
153 words
IN A TRACTOR MOUNTED LOADER WHICH INCLUDES A BUCKET CARRIED ON ARMS PIVOTED TO A TRACTOR, HYDRAULIC JACKS FOR EFFECTING RAISING AND LOWERING OF SAID ARMS, AND A HYDRAULIC CIRCUIT INCLUDING A CONTROL VALVE FOR DIRECTING FLUID UNDER PRESSURE FROM A SUPPLY TANK SELECTIVELY TO OPPOSITE ENDS OF SAID JACKS WHILE PERMITTING RETURN OF FLUID FROM THE OTHER ENDS, SAID VALVE HAVING A CLOSED POSITION PREVENTING SUCH RETURN OF FLUID, MEANS TO CUSHION BOUNCING ACTION OF SAID BUCKET WHEN IT IS ELEVATED COMPRISING AN ACCUMULATOR IN SAID CIRCUIT IN COMMUNICATION WITH THE ENDS OF SAID JACKS WHICH ARE UNDER PRESSURE WHEN THE BUCKET IS ELEVATED, A BY-PASS FORMING COMMUNICATION BETWEEN THE OPPOSITE ENDS OF SAID JACKS AND SAID SUPPLY TANK WHEN SAID VALVE IS IN ITS CLOSED POSITION, CONTROL MEANS IN SAID CIRCUIT CONTROLLING COMMUNICATION BETWEEN THE ACCUMULATOR AND THE ENDS OF THE JACKS, AND CONTROL MEANS IN SAID CIRCUIT CONTROLLING THE BY-PASS.
Claim 2
Dependent Claim
153 words
IN A TRACTOR MOUNTED LOADER WHICH INCLUDES A BUCKET CARRIED ON ARMS PIVOTED TO A TRACTOR, HYDRAULIC JACKS FOR EFFECTING RAISING AND LOWERING OF SAID ARMS, AND A HYDRAULIC CIRCUIT INCLUDING A CONTROL VALVE FOR DIRECTING FLUID UNDER PRESSURE FROM A SUPPLY TANK SELECTIVELY TO OPPOSITE ENDS OF SAID JACKS WHILE PERMITTING RETURN OF FLUID FROM THE OTHER ENDS, SAID VALVE HAVING A CLOSED POSITION PREVENTING SUCH RETURN OF FLUID, MEANS TO CUSHION BOUNCING ACTION OF SAID BUCKET WHEN IT IS ELEVATED COMPRISING AN ACCUMULATOR IN SAID CIRCUIT IN COMMUNICATION WITH THE ENDS OF SAID JACKS WHICH ARE UNDER PRESSURE WHEN THE BUCKET IS ELEVATED, A BY-PASS FORMING COMMUNICATION BETWEEN THE OPPOSITE ENDS OF SAID JACKS AND SAID SUPPLY TANK WHEN SAID VALVE IS IN ITS CLOSED POSITION, CONTROL MEANS IN SAID CIRCUIT CONTROLLING COMMUNICATION BETWEEN THE ACCUMULATOR AND THE ENDS OF THE JACKS, AND CONTROL MEANS IN SAID CIRCUIT CONTROLLING THE BY-PASS.
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) | 1967-02-24 | 1967-08-26 | 1968-02-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1971-02-24 | 1971-08-26 | 1972-02-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1975-02-24 | 1975-08-26 | 1976-02-25 | $7700.00 | Window Closed / Lapsed |