Patent US3795308A successfully refreshed from Google Patents.
US3795308A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Scraper for concrete conveyor belt
Assignee: Rotec Industries Inc
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Filing: 1972-04-11
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Granted: 1974-03-05
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Expires: 1992-04-11
Abstract
Abstract A scraper assembly used for removing residual concrete from a concrete conveyor belt, following removal of most of the concrete therefrom. A scraper blade is positioned against and substantially normal to the plane of the belt and substantially transverse thereto. The blade is constructed of a hard material such as carbide steel. A holder is provided for the scraper blade and the scraper blade is biased with pressure against the outer surface of the conveyor belt so as to substantially remove all the residual concrete therefrom.
Inventors
- 👤 R Oury
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 15:17
CPC Classifications
B; B65; B65G; B65G45/00; B65G45/10; B65G45/12; B65G45/16
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
181 words
A scraper assembly for substantially removing residual concrete from a moving concrete conveyor belt, said assembly comprising, in combination, a single blade only positioned substantially normal to said belt and at substantially right angles to the longitudinal axis of the direction of movement of said belt, said blade being fixed both longitudinally and transversely of said longitudinal axis of said belt, and being movable substantially only in a direction normal to the surface of said belt, said blade being constructed of tungsten carbide steel of at least 90 Rockwell A hardness, a pulley around which said belt passes, said blade bearing against the outer undersurface of said belt and being located longitudinally from but in close proximity to the location of said pulley, means for holding said blade, means for biasing said blade against said belt with sufficient pressure for accomplishing the desired removal of residual concrete therefrom, said pulley providing resistance to said biasing pressure, and means on said blade holding means having downwardly and outwardly inclined portions for directing scraped residual concrete to a location remote from said assembly.
Claim 2
Dependent Claim
181 words
A scraper assembly for substantially removing residual concrete from a moving concrete conveyor belt, said assembly comprising, in combination, a single blade only positioned substantially normal to said belt and at substantially right angles to the longitudinal axis of the direction of movement of said belt, said blade being fixed both longitudinally and transversely of said longitudinal axis of said belt, and being movable substantially only in a direction normal to the surface of said belt, said blade being constructed of tungsten carbide steel of at least 90 Rockwell A hardness, a pulley around which said belt passes, said blade bearing against the outer undersurface of said belt and being located longitudinally from but in close proximity to the location of said pulley, means for holding said blade, means for biasing said blade against said belt with sufficient pressure for accomplishing the desired removal of residual concrete therefrom, said pulley providing resistance to said biasing pressure, and means on said blade holding means having downwardly and outwardly inclined portions for directing scraped residual concrete to a location remote from said assembly.
Claim 3
Dependent Claim
31 words
The apparatus of claim 1 wherein said holding means includes first and second interengaging elements for holding said blade therebetwEen, said downwardly and outwardly inclined portions being defined on said elements.
Claim 4
Dependent Claim
55 words
The assembly of claim 1 including a frame, a pair of spaced arms pivotally mounted on said frame, said spaced arms having free ends and said holding means are connected to said free ends, and said biasing means comprises spring means interconnected between said arms and said frame for biasing said blade against said belt.
Claim 5
Dependent Claim
31 words
The apparatus of claim 3 including means for adjusting the tension of said spring means to attain the desired pressure sufficient for accomplishing removal of said residual concrete from said belt.
Claim 6
Dependent Claim
25 words
The apparatus of claim 1 wherein said blade includes an edge bearing against said belt, said edge having a substantially parabolic shape in cross section.
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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) | 1977-03-04 | 1977-09-03 | 1978-03-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-03-04 | 1981-09-03 | 1982-03-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-03-04 | 1985-09-03 | 1986-03-05 | $7700.00 | Window Closed / Lapsed |