US3557934A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Frame-type dump scrapers
Assignee: Gustav Schade Maschinenfabrik GmbH and Co
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Filing: 1969-02-03
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Granted: 1971-01-26
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Expires: 1989-02-03
Abstract
Abstract A dump scraper includes a frame having spaced-apart base portions adapted to be movably mounted on opposite sides of a dump. The frame includes legs extending upwardly toward one another from the base portions. A one-piece boom is pivoted to one of the base portions for pivotal movement in a vertical plane parallel to the legs. The boom receives support from the legs against substantial lateral deflection.
Inventors
- 👤 Fritz Schade
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 20:17
CPC Classifications
B; B65; B65G; B65G65/00; B65G65/02; B65G65/06
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
110 words
A dump scraper having first and second spaced-apart base portions adapted to be movably supported at opposite sides of a dump, said frame including first and second leg means extending upwardly toward one another from said first and second base portions respectively, one-piece scraper boom means pivotally connected to said first base portion for pivotal movement in a substantially vertical plane parallel to said leg means, Said boom having a length not substantially less than the spacing between said first and second base portions, said boom including a tip portion and having a length such that said tip portion projects beyond said second leg in raised positions of said boom.
Claim 2
Dependent Claim
110 words
A dump scraper having first and second spaced-apart base portions adapted to be movably supported at opposite sides of a dump, said frame including first and second leg means extending upwardly toward one another from said first and second base portions respectively, one-piece scraper boom means pivotally connected to said first base portion for pivotal movement in a substantially vertical plane parallel to said leg means, Said boom having a length not substantially less than the spacing between said first and second base portions, said boom including a tip portion and having a length such that said tip portion projects beyond said second leg in raised positions of said boom.
Claim 3
Dependent Claim
21 words
The device of claim 1 wherein said scraper boom means is supported against substantial lateral deflection by said second leg means.
Claim 4
Dependent Claim
41 words
The device of claim 2 wherein said scraper boom means has a lateral elastic deflection limit defined by a predetermined lateral distance, said scraper boom means being laterally spaced from said second leg means a distance less than said predetermined distance.
Claim 5
Dependent Claim
22 words
The device of claim 2 and further including abutment and guide means on said scraper boom means and said second leg means.
Claim 6
Dependent Claim
24 words
The device of claim 2 wherein said second leg means includes elongated slot means and said scraper boom means extends through said slot means.
Claim 7
Dependent Claim
25 words
The device of claim 2 wherein said scraper boom means includes two parallel spaced-apart scraper booms positioned on opposite sides of said second leg means.
Claim 8
Dependent Claim
38 words
The device of claim 6 wherein said two scraper booms have tip portions and said tip portions are connected by spacer means, said spacer means including lost motion means for providing limited vertical movement between said two booms.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-01-25 | 1974-07-27 | 1975-01-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-01-25 | 1978-07-27 | 1979-01-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-01-25 | 1982-07-27 | 1983-01-26 | $7700.00 | Window Closed / Lapsed |