Upwardly-acting door structure

Details Upwardly-acting door structure Upwardly-acting door structure

1975-06-25

1976-08-31

Downey, Kenneth

Movable or removable closures

Closures interconnected for concurrent movement

Moves at different speeds

105368R, 105410, 160193, 160194, 49125, E05F 1700

Patent

active

039771237

ABSTRACT:
An upwardly-acting door structure is adapted to close an access opening of a body member, such as an automobile-carrying railroad car. The door structure includes a stationary track on either side of the opening, movable tracks mounted for upward and downward movement along the stationary tracks, an upper panel mounted on the movable tracks, a lower panel mounted to move upwardly and downwardly along the movable tracks at twice the speed, flexible chains arranged to interconnect the lower panel with the movable tracks, torsional springs arranged to counterbalance and support the aggregate weight of the raised movable tracks, and handles operatively arranged to raise and lower the movable tracks. The upper and lower panels may be raised to uncover the access opening, or lowered to cover the access opening.

REFERENCES:
patent: 1439373 (1922-12-01), Norwood et al.
patent: 2154421 (1939-04-01), Cunningham
patent: 3067813 (1962-12-01), Henatsch
patent: 3616575 (1971-11-01), Harris
patent: 3911831 (1975-10-01), Blunden

Affiliated with

Also associated with

Rating

Upwardly-acting door structure does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Upwardly-acting door structure, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Upwardly-acting door structure will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-1807510