Expanding sleeve anchor used in a concrete wall and...

Details Expanding sleeve anchor used in a concrete wall and... Expanding sleeve anchor used in a concrete wall and...

2000-06-29

2001-10-30

Wilson, Neill (Department: 3627)

Expanded, threaded, driven, headed, tool-deformed, or locked-thr

Having separate expander means

Including sleeve and distinct tapered expander

C411S055000, C411S060200

Reexamination Certificate

active

06309155

ABSTRACT:

BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to an expanding sleeve anchor used in a concrete wall and a structure for enhancing the anchoring capability thereof.
2. Description of the Related Art
A first conventional expanding sleeve anchor structure used in a concrete wall in accordance with the prior art is shown in
FIGS. 1 and 2
. The expanding sleeve anchor structure comprises a nail base tube
3
provided with a plurality of separating lines
31
and an urging bolt
11
fitted with a tapered head
111
, extending through the nail base tube
3
. When the expanding sleeve anchor is inserted into cavity
41
of concrete wall
4
, tapered head
111
is pressed into the nail base tube
3
, and the separating lines
31
are urged outward, thereby securing the nail base tube
3
in the cavity
41
of the concrete wall
4
.
A second conventional expanding sleeve anchor structure used in a concrete wall in accordance with the prior art is shown in
FIGS. 3 and 4
. The expanding sleeve anchor structure comprises a nail base tube
3
inserted into a cavity
41
of the concrete wall
4
and provided with a plurality of separating lines
31
, a bolt
21
extending through the nail base tube
3
, and an urging nut
22
screwed on the bolt
21
to be pressed into the nail base tube
3
for urging the separating lines
31
outward, thereby securing the nail base tube
3
in the cavity
41
of the concrete wall
4
.
As shown in
FIG. 5
, the conventional nail base tube
3
includes a plurality of front end guide inlets
32
for allowing entrance of the tapered head
111
of the urging bolt
11
as shown in
FIG. 2
or the urging nut
22
as shown in
FIG. 4
into the nail base tube
3
. However, the front end guide inlets
32
of the conventional nail base tube
3
have a large forging face so that the tapered head
111
of the urging bolt
11
or the urging nut
22
is not easily pressed into the conventional nail base tube
3
through the front end guide inlets
32
.
SUMMARY OF THE INVENTION
In accordance with one aspect of the present invention, there is provided an expanding sleeve anchor structure used in a concrete wall for enhancing the anchoring capability thereof and comprising a nail base tube cooperating with an urging member, the improvement comprising: the nail base tube having an upper section provided with a plurality of separating lines each having an elongated transverse hollow slot substantially centered thereon which is used for reducing stress concentration in the upper section of the nail base tube when the upper section of the nail base tube is forced to expand outward.
Preferably, the hollow slot has one end provided with a notch, extending upward or downward, and an outward folding region defined between the expanding section and the separating line whereby the outward folding region can be forced into a wall of a cavity of a concrete wall, thereby enhancing the anchoring capability of the expanding sleeve anchor structure.
Preferably, the nail base tube has a front end provided with at least two equally spaced inlet tabs.
Further benefits and advantages of the present invention will become apparent after a careful reading of the detailed description with appropriate reference to the accompanying drawings.


REFERENCES:
patent: 1293844 (1919-02-01), Malaby
patent: 4692076 (1987-09-01), Herb
patent: 4720224 (1988-01-01), Peterken
patent: 1525127 (1968-04-01), None

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