Boring or penetrating the earth – Cutter element laterally shiftable below ground – Cutter element shifted by cam or gear axially rotatable...
Reexamination Certificate
2005-02-08
2005-02-08
Bagnell, David (Department: 3672)
Boring or penetrating the earth
Cutter element laterally shiftable below ground
Cutter element shifted by cam or gear axially rotatable...
C175S286000, C408S153000
Reexamination Certificate
active
06851492
ABSTRACT:
In a fastener of a post-installation type which is embedded after a drilled hole is provided at concrete structure, a sleeve (2) and a plug (3) press-fitted to the sleeve are positioned by convexoconcave engagement between a projecting portion at an inner periphery of an expansion portion (6) and a recess groove (11) at a tip end of the plug (3) before installation, and therefore the separation therebetween is prevented. After installation, the projection portion at the inner periphery of the expansion portion (6) expanded is again engaged with the recess groove (12) of the tip end of the plug (3). By this positioning effect, the fastener performs an effect for preventing a loosening between the sleeve and the plug against the vibrations.
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Bachman & LaPointe P.C.
Bagnell David
Kabushiki Kaisha Zen Kenchiku Sekkei Jimusho
Stephenson Daniel P
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