US3122247A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Automatic positioning device for material handling bucket
Assignee: Caterpillar Inc
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Filing: 1960-12-27
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Granted: 1964-02-25
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Expires: 1980-12-27
Abstract
No abstract record available.
Inventors
- 👤 Henry E Beck
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 00:23
CPC Classifications
E; E02; E02F; E02F3/00; E02F3/04; E02F3/28; E02F3/36; E02F3/42; E02F3/43; E02F3/431; E02F3/432
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
121 words
IN COMBINATION WITH A MATERIAL HANDLING BUCKET WHICH IS PIVOTED TO A LIFT FRAME OF A LOADER FOR MOVEMENT BETWEEN A LOAD POSITION AND A CARRY POSITION, A HYDRAULIC JACK FOR EFFECTING SUCH MOVEMENT AND A SPRING CLOSED VALVE FOR CONTROLLING THE FLOW OF FLUID UNDER PRESSURE TO SAID JACK MEANS INCLUDING A DETENT FOR LATCHING SAID VALVE IN AN OPEN POSITION TO CAUSE MOVEMENT OF THE BUCKET TOWARD LOAD POSITION, SAID LAST NAMED MEANS INCLUDING A CLOSED HYDRAULIC CIRCUIT SEPARATE FROM THE CIRCUIT WHICH ACTUATES SAID JACK MEANS TO RETRACT THE DETENT THROUGH THE MEDIUM OF HYDRAULIC PRESSURE IN SAID CLOSED CIRCUIT, AND MEANS ACTUATED IN RESPONSE TO RELATIVE MOVEMENT OF THE JACK CYLINDER AND PISTON TO PRODUCE SAID PRESSURE.
Claim 2
Dependent Claim
121 words
IN COMBINATION WITH A MATERIAL HANDLING BUCKET WHICH IS PIVOTED TO A LIFT FRAME OF A LOADER FOR MOVEMENT BETWEEN A LOAD POSITION AND A CARRY POSITION, A HYDRAULIC JACK FOR EFFECTING SUCH MOVEMENT AND A SPRING CLOSED VALVE FOR CONTROLLING THE FLOW OF FLUID UNDER PRESSURE TO SAID JACK MEANS INCLUDING A DETENT FOR LATCHING SAID VALVE IN AN OPEN POSITION TO CAUSE MOVEMENT OF THE BUCKET TOWARD LOAD POSITION, SAID LAST NAMED MEANS INCLUDING A CLOSED HYDRAULIC CIRCUIT SEPARATE FROM THE CIRCUIT WHICH ACTUATES SAID JACK MEANS TO RETRACT THE DETENT THROUGH THE MEDIUM OF HYDRAULIC PRESSURE IN SAID CLOSED CIRCUIT, AND MEANS ACTUATED IN RESPONSE TO RELATIVE MOVEMENT OF THE JACK CYLINDER AND PISTON TO PRODUCE SAID PRESSURE.
References Cited (Backward Citations)
USRE24746E
Cited
US2065176A
Cited
US2305302A
Cited
FR1068273A
Cited
US2759456A
Cited
US2755776A
Cited
US2883077A
Cited
US2884222A
Cited
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 |