Expanded – threaded – driven – headed – tool-deformed – or locked-thr – Having separate expander means – Including sleeve and distinct tapered expander
Reexamination Certificate
2000-11-02
2002-10-01
Wilson, Neill (Department: 3679)
Expanded, threaded, driven, headed, tool-deformed, or locked-thr
Having separate expander means
Including sleeve and distinct tapered expander
C411S061000, C411S060200
Reexamination Certificate
active
06457922
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The invention relates to an expansion bolt assembly, more particularly to an expansion bolt assembly with multiple functions.
2. Description of the Related Art
Referring to
FIG. 1
, a conventional expansion bolt assembly
1
includes a bolt body
11
, an expansion sleeve
12
sleeved on the bolt body
11
, and a nut
13
engaging threadedly the bolt body
11
. One end of the bolt body
11
is formed with a head portion
14
adapted to be driven by a screwdriver (not shown). The nut
13
engages the opposite end of the bolt body
11
. The sleeve
12
is interposed between the head portion
14
and the nut
13
, and has a rear portion formed with a plurality of axially extending slits
121
. In addition, the nut
13
is formed with a taper section
131
that can, due to the arrangement of the slits
121
, extend into the rear portion of the sleeve
12
to force the sleeve
12
to expand.
With reference to
FIG. 2
, during installation, the conventional expansion bolt assembly
1
is inserted into a bore
151
formed in a wall
15
and of a size corresponding to the diameter of the expansion bolt assembly
1
. A tool (not shown) is used to rotate the head portion
14
and the bolt body
11
. At this time, friction acting on the nut
13
will cause the latter to displace and extend into the rear portion of the sleeve
12
such that the taper section
131
thereof forces the rear portion of the sleeve
12
to expand. Hence, the rear portion of the sleeve
12
can frictionally engage the portion of the wall
15
confining the bore
151
to thereby position the expansion bolt assembly
1
firmly in the wall
15
.
However, in use, the conventional expansion bolt assembly
1
can only be utilized to fix an object on a wall surface, and does not permit hanging of another object thereon or connection to another object.
SUMMARY OF THE INVENTION
Therefore, the main object of the present invention is to provide an expansion bolt assembly with multiple functions.
Accordingly, an expansion bolt assembly of the present invention is adapted to be installed on a wall that is formed with a bore. The expansion bolt assembly includes an elongated bolt body, a washer, a tubular expansion sleeve, and a nut. The bolt body is formed with an externally threaded insert portion that is adapted to be inserted into the bore, and an anchoring portion that extends from the insert portion and that is adapted to extend out of the bore and to project from the wall. The anchoring portion includes an externally threaded shank and a turning unit. The turning unit is disposed on one end of the shank and is adapted to engage a tool for driving axial rotation of the bolt body. The washer is sleeved on the bolt body between the insert and anchoring portions, and is adapted to lie against the wall. The sleeve is sleeved on the insert portion and has a proximate section abutting against the washer, and a distal section. The distal section is opposite to the proximate section and is formed with a plurality of axially extending slits. The sleeve cooperates with the insert portion to confine an annular expansion chamber therebetween. The nut engages threadedly the insert portion adjacent to the distal section of the sleeve. The nut is formed with a taper section that extends into the expansion chamber when the bolt body is driven to rotate relative to the nut, thereby forcing the distal section of the sleeve to expand so as to be adapted to frictionally engage a bore-defining surface of the wall.
REFERENCES:
patent: 4011786 (1977-03-01), Liebig
patent: 4339217 (1982-07-01), Lacey
patent: 4570891 (1986-02-01), Kaplan
patent: 5685678 (1997-11-01), Giannuzzi et al.
patent: 3022011 (1981-12-01), None
patent: 2094919 (1982-09-01), None
Trop Pruner & Hu P.C.
Wilson Neill
LandOfFree
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