Roller drop door

Details Roller drop door Roller drop door

1978-04-20

1980-07-08

Downey, Kenneth

Movable or removable closures

Mounted for multidirectional or oblique movement

In plane of closure; e.g., oblique

E05D 1556

Patent

active

042110386

ABSTRACT:
A railway house car having a door supporting track on a car side beneath a door opening, a door formed with a lower edge surface for support of the door on the top of the track and to provide a good light seal when the door is in the closed position. The edge surface has a plurality of openings with a portion of a roller extending from each one. Corresponding copes are located in the top of the track to receive the roller portions when the door is in the closed position. The rollers and corresponding copes permit at least two rollers to engage the top of the track and support the door for movement when the door is in other positions on the track than the closed position. A door leverage or force-multiplying mover is selectively interconnected to the door by means of a hasp to initially move the door from the closed position. Alternatively, a fulcrum is provided so that a pry bar can manually engage a bottom retainer to accomplish the initial door movement. The track is welded throughout its length minimizing damage during loading and unloading operations and to prevent any portion of the door from being wedged between the car side and the track.

REFERENCES:
patent: 515248 (1894-02-01), Phipps
patent: 2027599 (1936-01-01), Madland
patent: 2124040 (1938-07-01), Olander
patent: 2348369 (1944-05-01), Small

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