Bulk material transport vehicle access structure
OwnerAnthony Jay Cookinventor
Life of this patent
Estimating the term…
Abstract
A bulk material transport vehicle access structure includes an elongated service platform for workers which is pivotally supported at its opposite ends to cantilever arms on parallel horizontal axes to avoid binding between the roller carriages of the cantilever arms and a pair of support pillars. The floor of the platform includes a walkway and a doorway covered by a plurality of side by side doors which may be selectively opened. Electric controls are provided to automatically stop operation of the power means used to control the elevation of the cantilever arms should the service platform become tilted a predetermined extent. Electric controls are also provided to stop lowering of the service platform when it reaches the top of a bulk material transport vehicle.
Claims7
A bulk material transport vehicle access structure comprising:
- a pair of horizontally spaced stationary upright pillars disposed in a first upright plane, each of said upright pillars including vertical guide tracks,
- an elongated, horizontal service platform having longitudinally opposite ends,
- a pair of horizontally extending parallel cantilever arms having corresponding ends supported on said guide tracks of said pillars, respectfully, for vertical up and down movement on said pillars, said cantilever arms being disposed at right angles to said first upright plane as said service platform is raised or lowered,
- said pair of cantilever arms being pivotally connected, respectively, to said opposite ends of said service platform on parallel horizontal axes extending at right angles to said first upright plane, and
- electrically controlled power means connected to said arms operable to raise and lower said arms and said service platform simultaneously.
Dependencies are inferred from the claim text.