Anchor bolt having a spring
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United States of America Patent
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-
Aug 27, 1991
Grant Date -
N/A
app pub date -
Jul 18, 1990
filing date -
Jun 6, 1990
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
An anchor bolt having a spring member is provided, with the anchor bolt comprising a fastening sleeve, an expansion sleeve and an expansion body. The spring member is interposed between the fastening sleeve and the expansion sleeve, and the expansion body is disposed at one end portion of a threaded rod formed as an anchor main body and is adapted to be inserted deep in a hole of a concrete structure together with the threaded rod. The said fastening sleeve and spring member are loosely fitted on the threaded rod, wherein the fastening sleeve adapted to be fixed within an inlet portion of the hole compresses the spring member to urge the expansion sleeve toward the expansion body so as to be expanded thereby, thus preventing the anchor bolt from being removed from or being loosened in the hole. The fastening sleeve preferably comprises an opening through which an end portion of the spring member extends to be exposed for visual inspection. The expansion body may either be formed integral with the screw rod, or be formed as a nut mating therewith.
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