US3352037A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Power operated apron for tractor scrapers
Assignee: Doosan Bobcat North America Inc
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Filing: 1965-06-10
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Granted: 1967-11-14
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Expires: 1985-06-10
Abstract
No abstract record available.
Inventors
- 👤 Allan R Swanson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 15:05
CPC Classifications
E; E02; E02F; E02F3/00; E02F3/04; E02F3/64; E02F3/6454; E02F3/65; E02F3/654; E02F3/657
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
164 words
IN AN EARTH MOVING SCRAPER HAVING A BOWL WITH AN OPENING AT ONE END THEREOF AND AN APRON PIVOTALLY MOUNTED ON SAID BOWL FOR OPENING AND CLOSING SAID OPENING OF SAID BOWL, THE COMBINATION OF CAM MEANS AND CAM FOLLOWER MEANS BETWEEN SAID APRON AND SAID BOWL, POWER ACTUATING MEANS FOR EFFECTING RELATIVE MOVEMENT BETWEEN SAID CAM MEANS AND SAID CAM FOLLOWER MEANS TO PROVIDE FOR PIVOTAL MOVEMENT OF SAID APRON ABOUT ITS PIVOT FOR OPENING SAID OPENING OF SAID BOWL, AND SAID CAM MEANS HAVING A FIRST CAM PATH PORTION PROVIDING FOR SUBSTANTIALLY CONSTANT APPLICATION OF TORQUE OF SAID POWER ACTUATING MEANS OVER A PREDETERMINED RANGE OF INITIAL OPENING MOVEMENT OF SAID APRON WITH RESPECT TO SAID OPENING OF SAID BOWL, AND A SECOND CAM PATH PORTION PROVIDING FOR LESSENING THE TORQUE APPLIED BY SAID POWER ACTUATING MEANS TO SAID APRON IN THE CONTINUED OPENING MOVEMENT THEREOF BY SAID POWER ACTUATING MEANS BEYOND SAID PREDETERMINED RANGE OF INITIAL OPENING MOVEMENT OF SAID APRON.
Claim 2
Dependent Claim
164 words
IN AN EARTH MOVING SCRAPER HAVING A BOWL WITH AN OPENING AT ONE END THEREOF AND AN APRON PIVOTALLY MOUNTED ON SAID BOWL FOR OPENING AND CLOSING SAID OPENING OF SAID BOWL, THE COMBINATION OF CAM MEANS AND CAM FOLLOWER MEANS BETWEEN SAID APRON AND SAID BOWL, POWER ACTUATING MEANS FOR EFFECTING RELATIVE MOVEMENT BETWEEN SAID CAM MEANS AND SAID CAM FOLLOWER MEANS TO PROVIDE FOR PIVOTAL MOVEMENT OF SAID APRON ABOUT ITS PIVOT FOR OPENING SAID OPENING OF SAID BOWL, AND SAID CAM MEANS HAVING A FIRST CAM PATH PORTION PROVIDING FOR SUBSTANTIALLY CONSTANT APPLICATION OF TORQUE OF SAID POWER ACTUATING MEANS OVER A PREDETERMINED RANGE OF INITIAL OPENING MOVEMENT OF SAID APRON WITH RESPECT TO SAID OPENING OF SAID BOWL, AND A SECOND CAM PATH PORTION PROVIDING FOR LESSENING THE TORQUE APPLIED BY SAID POWER ACTUATING MEANS TO SAID APRON IN THE CONTINUED OPENING MOVEMENT THEREOF BY SAID POWER ACTUATING MEANS BEYOND SAID PREDETERMINED RANGE OF INITIAL OPENING MOVEMENT OF SAID APRON.
References Cited (Backward Citations)
US2307933A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1970-11-13 | 1971-05-15 | 1971-11-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1974-11-13 | 1975-05-15 | 1975-11-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1978-11-13 | 1979-05-15 | 1979-11-14 | $7700.00 | Window Closed / Lapsed |