Weight assembly for a large structure raising system
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United States of America Patent
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Jan 6, 2015
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N/A
app pub date -
Jul 14, 2009
filing date -
Jul 14, 2008
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Abstract
A retractable roof system (30) for a large building structure (32) for selectively closing off an opening (39) of a fixed roof (34) of the building structure (32), the system includes at least one roof section (40) movably mountable on at least one pier (42). A deployment mechanism (46) is provided and includes a weight assembly in the form of a piston (76) of cylindrical form and comprising a generally cylindrical body (76) provided with top and bottom ring-type cylinder bumpers (78) and seal rings (84) let into ring grooves formed in the surface of the piston.
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