An apparatus for sealing a vacuum tank door. The apparatus comprises a circular flange attached to a door panel of a vacuum tank, a horizontal crossbar connected to the center of the door panel and a lifting assembly. The lifting assembly comprises an upper linkage arm, a lower linkage arm, and a hy
An apparatus for sealing a vacuum tank door. The apparatus comprises a circular flange attached to a door panel of a vacuum tank, a horizontal crossbar connected to the center of the door panel and a lifting assembly. The lifting assembly comprises an upper linkage arm, a lower linkage arm, and a hydraulic cylinder. Activation of the hydraulic cylinder causes the linkage assembly to move downwards pulling on the horizontal crossbar and pulling the vacuum tank door towards the tank. Activation of the hydraulic cylinder also causes a connection point of the lower linkage arm and the upper linkage arm to move over-center of the connection between the lower linkage arm to the to the tank creating a tight seal between the vacuum tank door and the tank.
대표청구항▼
1. A door assembly comprising: a dome-shaped door having an inner surface, an outer surface, a cylindrical base, an apex and a central axis that extends through the apex in an orthogonal relationship to the base;a first brace engaging the inner surface and joining opposed portions of the base;a seco
1. A door assembly comprising: a dome-shaped door having an inner surface, an outer surface, a cylindrical base, an apex and a central axis that extends through the apex in an orthogonal relationship to the base;a first brace engaging the inner surface and joining opposed portions of the base;a second brace engaging the inner surface and joining opposed portions of the base, in which the second brace is orthogonally disposed relative to the first brace;a third brace engaging the inner surface and joining opposed portions of the base, in which the third brace is parallel to the first brace;a fourth brace engaging the inner surface and joining opposed portions of the base, in which the fourth brace is parallel to the second brace; anda plurality of brackets connected to the outer surface of the door at points equidistant from the central axis, the brackets being operatively connectable to a door movement assembly. 2. The door assembly of claim 1 in which the outer surface of the door is convex and the inner surface of the door is concave. 3. The door assembly of claim 2 in which each of the first brace, the second brace, the third brace, and the fourth brace is sized to fit flush against the concave inner surface of the door. 4. The door assembly of claim 1 in which the first and third braces are each disposed on opposite sides of a diameter of the door. 5. The door assembly of claim 1 in which the first brace, the second brace, the third brace, and the fourth brace are each fully contained within the door. 6. The door assembly of claim 1 in which each of the first brace, the second brace, the third brace, and the fourth brace is formed from multiple pieces. 7. The door assembly of claim 1 in which the base extends between an upper and lower end, and in which each of the first brace, the second brace, the third brace, and the fourth brace has a terminal edge contained within the base and spaced from the lower end. 8. The door assembly of claim 1 in which each of the first brace, the second brace, the third brace, and the fourth brace has a first curved side and an opposite second flat side, in which the first curved side engages the inner surface of the door. 9. The door assembly of claim 1 in which the door movement assembly comprises a first linkage assembly connected to a first actuator, and a second linkage assembly connected to a second actuator. 10. The door assembly of claim 9 in which one of the plurality of brackets is attached to the first linkage assembly and one of the plurality of brackets is attached to the second linkage assembly. 11. The door assembly of claim 9 in which the first and second actuators operate jointly to cause the first linkage assembly and the second linkage assembly to open and close the door. 12. The door assembly of claim 1 in which the plurality of brackets comprise a first bracket connected to the outer surface at the periphery of the door and a second bracket connected to the outer surface at the periphery of the door. 13. The door assembly of claim 12 in which the first bracket comprises a first horizontal bar having a pivotal connection with the door movement assembly. 14. The door assembly of claim 13 in which the second bracket comprises a second horizontal bar having a pivotal connection with the door movement assembly. 15. The door assembly of claim 1 in which each of the first brace, the second brace, the third brace, and the fourth brace are all spaced apart from a center of the door. 16. The door assembly of claim 1 in which each of the first brace, the second brace, the third brace, and the fourth brace extend within the base along a non-diametrical chord of a circle defining the cross-sectional profile of the base. 17. A vacuum system comprising: a tank having an open end and a closed end; andthe door assembly of claim 1 attached to the open end of the tank. 18. The vacuum system of claim 17 in which the tank is supported on a trailer. 19. The vacuum system of claim 17 in which the base has a lower end contained within a plane that is perpendicular to a ground surface when the door is in a closed position. 20. The vacuum system of claim 17 in which the base has a lower end contained within a plane that is parallel to a ground surface when the door is in a fully opened position.
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