Hole former with gasket locating features for cast manhole structures
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United States of America Patent
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Sep 29, 2020
Grant Date -
Aug 23, 2018
app pub date -
Feb 13, 2018
filing date -
Feb 20, 2017
priority date (Note) -
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status (Latency Note)
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Abstract
A hole former for use in casting a gasket within an opening of a structure of the type used in underground water systems, such as a manhole. The hole former includes a body defining a central axis and an outer peripheral surface, with at least one gasket retention element projecting radially outwardly from the outer peripheral surface to interface with a corresponding locating feature of the gasket. In this manner, axial shifting or movement of the gasket with respect to the hole former is restricted, thereby positively locating and retaining the gasket on the hole former before and during the casting process. The hole former may have a compound curvature, with the gasket retained around the periphery of the hole former in a compound curved configuration.
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