Apparatus for closing and sealing a doorway
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United States of America Patent
Stats
-
Sep 13, 1983
Grant Date -
N/A
app pub date -
Dec 18, 1981
filing date -
Dec 18, 1981
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A door is mounted on a carrier to move back and forth with the carrier between open and closed positions relative to a furnace doorway and to move inwardly relative to the carrier to seal the doorway. Bearing means engage the outer side of the carrier to support the carrier with rolling friction and to sustain the outward thrust which is imposed on the carrier when the door is moved inwardly to seal the doorway. The bearing means comprise a single spherical ball which is captivated in a cage to roll back and forth when the carrier is shifted and, at the same time, to spin universally about its own center.
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Cited Art Landscape
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