Roller drop door

Details Roller drop door Roller drop door

E - Fixed Constructions

05

D

108/10

E05D 15/06 (2006.01) E05D 15/56 (2006.01)

Patent

CA 1120330

ROLLER DROP DOOR Abstract of the Disclosure Disclosed is a rail house car door having a supporting track on a car side beneath a door opening. The door is formed with a lower edge surface for support of the door on the top of the track in engagement with the track when the door is in a position to close the opening. The lower edge surface ex- tends substantially through the width of the door and has a plurality of at least three intermediate openings with portions of a plurality of at least three longitudinally or spaced rollers extending therefrom. The track can be sealed in contact with the door side beneath the door opening substantially throughout the length of the track and has a plurality of at least three corresponding intermediate copes of enlarged longitudinal dimension in the top of the track located to receive the rollers when the door is supported on the lower edge surface in a posi- tion to sealingly engage the track to close and seal the open- ing. The copes' enlarged dimensions, during closing and just prior to final movement of the door into position to close and seal the opening, permit a final longitudinal sliding movement of the lower door edge surface on the top of the track to close and seal the opening, and during opening, permit an initial relatively short longitudinal sliding movement of the door edge surface on the track to initially open the opening. This also permits at least two of the rollers to engage the top of the track and support the door with the lower edge surface removed from the track for longitudinal movement when the door is in other positions on the track. The lower edge surface being located so as to define the inwardmost portion of the door adjacent the track such that in the closed position of the door, a seal is provided with the track and the potential damage to the track tending to move it closer to the car side can not clamp any portion of the door between the track and the car side, thereby hindering selective door movement.

307312

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