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US 4,460,110 AGranted
Openable closing device for freight or storage tanks
AssigneeEsko Pollto Oy
InventorPertti J. Helander
Life of this patent
Estimating the term…
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AssigneeEsko Pollto Oy
InventorPertti J. Helander
Estimating the term…
So that a freight or storage tank for bulk material, that has at least one long emptying hole on the bottom, can be closed and opened, the tank has at least one flexible belt that extends essentially over the length of the opening and whose one end is attached to the tank, and under which is a roller or roller system that is approximately of the same length and that supports the belt when in the closed position and that can be removed from the closed position, as well as elements to move the roller or roller system across the opening between two extreme positions. Elements that guide the roller or roller system between the two extreme positions by way of the top dead center and operating elements that force the roller or roller system over the top dead center are fitted onto the tank's frame so that the opening is closed more firmly the greater the tank's load and so that the load's weight is used in opening the opening and so that a loosening effect upon the tank's contents is achieved when the opening is opened. The belt may also be endless essentially covering the whole width of the opening and mounted over the roller system's rollers.
An apparatus for closing, so as to be opened, a tank for bulk material, the tank having at least one long emptying opening on the bottom, one or two flexible belts that are essentially as long as the opening and are fastened at one end to the tank, roller means that is under the belt and of approximately the same length and that supports the belt in the closed position and can be removed from the closed position, and means for moving the roller means across the opening between two extreme positions, said means for moving the roller means comprising guiding means fitted onto the tank's frame to guide the roller means between the said two extreme positions, in a convex arcuate path providing the roller means with a top dead center, by way of the top said dead center and operating means for forcing the roller means over the said top dead center.
An apparatus for closing, so as to be opened, a tank for bulk material, the bottom of the tank having at least one long emptying opening, the apparatus comprising one or two roller means that are under the opening and movably fitted onto the tank's frame and being of approximately the same length as the opening, the roller means having an endless belt that essentially covers the whole width of the opening and that is fitted over the roller means, means fitted onto the tank's frame to guide the roller means across the opening between two extreme positions, in a convex arcuate path providing the roller means with a top dead center, by way of said top dead center, and operating means to force the roller means to move over the top dead center.
Dependencies are inferred from the claim text.