Lightweight boxcar roof

Railway rolling stock – Car framing and structure – Freight

Reexamination Certificate

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Details

C105S396000, C052S045000, C052S051000, C052S052000, C052S053000

Reexamination Certificate

active

06336411

ABSTRACT:

BACKGROUND AND SUMMARY OF THE INVENTION
This invention is directed to a lightweight roof for a railroad boxcar which is formed of larger sheets of galvanized steel than have been conventionally used in the industry for boxcar roofs.
An object of this invention is a boxcar roof having fewer but larger roof sheets than prior boxcars to reduce the cost of installation of the roof.
Another object of this invention is a boxcar roof that is more resistant to leakage because fewer seam caps and thus fewer seam cap rivet passages are provided.
Yet another object of this invention is a lightweight roof assembly in which stronger roof panels are provided over the side door openings of the boxcar.
Still another object of this invention is a lightweight roof for a boxcar that is considerably lighter than conventional boxcar roofs.


REFERENCES:
patent: 1681819 (1928-08-01), Small
patent: 1810446 (1931-06-01), Swason
patent: 1870398 (1932-08-01), Bonsall
patent: 1878430 (1932-09-01), Swanson
patent: 1880085 (1932-09-01), Gilpin
patent: 2034377 (1936-03-01), Bonsall
patent: 2034379 (1936-03-01), Bonsall
patent: 2034382 (1936-03-01), Bonsall
patent: 2085338 (1937-06-01), Schlesinger
patent: 2085540 (1937-06-01), Murphy
patent: 2106988 (1938-02-01), Tatum
patent: 2204348 (1940-06-01), Finger
patent: 2242766 (1941-05-01), Torburn
patent: 2243113 (1941-05-01), Mussey et al.
patent: 2350213 (1944-05-01), Bonsall
patent: 5988074 (1999-11-01), Thoman

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