Closure device
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United States of America Patent
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-
Jan 9, 2007
Grant Date -
N/A
app pub date -
Mar 29, 2006
filing date -
Feb 28, 2006
priority date (Note) -
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Abstract
A fixed frame (4) and a covering element (6), the frame (4) defining a frame plane (P--P). A first latch (30) has two latch surfaces (32, 34) which cooperate and which are inclined relative to the frame plane (P--P). The covering element (6) and the frame (4) comprise cooperating stop surfaces (52, 56) which limit a displacement of the lid (6) within the frame (4) in the frame plane (P--P). The stop surfaces (52, 56) are inclined relative to the frame plane (P--P) by an angle of from 30.degree. to 80.degree. and they maintain the covering element flat on the frame. Application to manhole covers for closing manholes.
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