Conveyors: power-driven – Conveyor having impinging fluid to feed – shift or discharge... – Having cleaning means
Reexamination Certificate
2000-03-02
2001-11-27
Noland, Kenneth W. (Department: 3651)
Conveyors: power-driven
Conveyor having impinging fluid to feed, shift or discharge...
Having cleaning means
C015S256500
Reexamination Certificate
active
06321901
ABSTRACT:
BACKGROUND OF THE INVENTION
The present invention is directed to a conveyor belt cleaner and tensioner assembly including a conveyor belt cleaner having a plurality of scraper blades adapted to scrape adherent material from a conveyor belt and a conveyor belt cleaner tensioner for resiliently linearly biasing the scraper blades into scraping engagement with the conveyor belt.
Conveyor belt cleaners are used to remove material which adheres to the surface of a conveyor belt after the material has moved past the discharge point of a conveyor. During use the scraper blades of the conveyor belt cleaner wear due to their scraping engagement with the conveyor belt and eventually require replacement. Quick and easy replacement of worn scraper blades is desired to reduce maintenance costs and to reduce conveyor down time. Scraper blades are biased into engagement with the conveyor belt by one or more tensioners such that the scraper blades engage the conveyor belt with a desired amount of force to maximize cleaning efficiency. A linear tensioner maintains the scraper blades at substantially a constant angle with respect to the conveyor belt to maximize cleaning efficiency. However, it is also desirable to allow the scraper blades to rotate away from the conveyor belt when obstructions on the belt, such as mechanical belt splices, are encountered by the scraper blades.
SUMMARY OF THE INVENTION
A conveyor belt cleaner and tensioner assembly including a conveyor belt cleaner and a conveyor belt cleaner tensioner. The conveyor belt cleaner includes a scraper blade assembly that is removably mounted to a cross shaft. The scraper blade assembly includes a mounting member having a base member, a first flange extending outwardly from the base member, and a second flange extending outwardly from the base member. The first and second flanges form a first slot therebetween. The base member includes a generally circular bore through which the cross shaft extends. Each end of the base member includes a pair of diametrically opposed slots which are adapted to receive a fastener which removably connects the mounting member to the cross shaft for conjoint rotation with the cross shaft. The scraper blade assembly also includes one or more scraper blades. Each scraper blade has a mounting base and a scraping tip attached to the mounting base. The mounting base includes a bore through which the base member of the mounting member extends. The mounting base also includes a third flange and a second slot and a third slot located on opposite sides of the third flange. The third flange is adapted to be inserted into the first slot of the mounting member to form a first interlocking connection therebetween. The second slot is adapted to receive the first flange of the mounting member to form a second interlocking connection therebetween, and the third slot is adapted to receive the second flange of the mounting member to form a third interlocking connection therebetween. The interlocking connections prevent rotation of the scraper blade with respect to the mounting member.
The conveyor belt cleaner tensioner includes a mounting bracket and a tensioning rod rotatably attached to the mounting bracket. A support arm includes a first end rotatably attached to the tensioning rod and a second end. A pivot arm has a first end pivotally attached to the first end of the support arm for pivotal movement about a pivot axis and a second end adapted to receive the cross shaft. A biasing member is located between the support arm and the pivot arm to resiliently pivot the pivot arm about the pivot axis with respect to the support arm. A fastener extends between the support arm and pivot arm to allow pivotal movement of the pivot arm toward the support arm but to prevent pivotal movement of the pivot arm away from the support arm beyond a predetermined limit. Selective rotation of the tensioning rod about its central axis moves the support bracket and pivot arm along the tensioning rod until the scraper blades engage the conveyor belt. Thereafter continued rotation of the tensioning rod compresses the biasing member such that the biasing member resiliently biases the scraper blades into engagement with the conveyor belt.
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Brody Steve
Strebel Mark
Swearingen Terry
Lee Mann Smith McWilliams Sweeney & Ohlson
Martin Engineering Company
Noland Kenneth W.
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