Information
-
Patent Grant
-
6309155
-
Patent Number
6,309,155
-
Date Filed
Thursday, June 29, 200024 years ago
-
Date Issued
Tuesday, October 30, 200122 years ago
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Inventors
-
Original Assignees
-
Examiners
Agents
-
CPC
-
US Classifications
Field of Search
US
- 411 34
- 411 36
- 411 55
- 411 601
- 411 602
- 411 61
-
International Classifications
-
Abstract
An expanding sleeve anchor structure includes a nail base tube cooperating with a tapered spreading member. The nail base tube has 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 the stress concentration of the upper section of the nail base tube when the upper section of the nail base tube is forced to expand outward resulting in complete expansion.
Description
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.
BRIEF DESCRIPTION OF THE DRAWINGS
FIG. 1
is a front plan cross-sectional view of a first conventional expanding sleeve anchor structure used in a concrete wall in accordance with the prior art;
FIG. 2
is an operational view of the first conventional expanding sleeve anchor structure as shown in
Fig. 1
;
FIG. 3
is a front plan cross-sectional view of a second conventional expanding sleeve anchor structure used in a concrete wall in accordance with the prior art;
FIG. 4
is an operational view of the second conventional expanding sleeve anchor structure as shown in
FIG. 3
;
FIG. 5
is a front plan view of a nail base tube of the conventional expanding sleeve anchor structure in accordance with the prior art;
FIG. 6
is an exploded view of an expanding sleeve anchor structure used in a concrete wall in accordance with a first embodiment of the present invention;
FIG. 7
is an exploded view of an expanding sleeve anchor structure used in a concrete wall in accordance with a second embodiment of the present invention;
FIG. 8
is a front plan view of a nail base tube of the expanding sleeve anchor structure in accordance with the present invention;
FIG. 9
is a front plan cross-sectional assembly view of the expanding sleeve anchor structure as shown in
FIG. 6
;
FIG. 10
is an operational view of the expanding sleeve anchor structure as shown in
FIG. 9
;
FIG. 11
is a front plan cross-sectional assembly view of the expanding sleeve anchor structure as shown in
FIG. 7
;
FIG. 12
is an operational view of the expanding sleeve anchor structure as shown in
FIG. 11
;
FIG. 13
is a front plan view of a nail base tube expanding sleeve anchor structure in accordance with a further embodiment of the present invention;
FIG. 14
is a front plan cross-sectional assembly view of the expanding sleeve anchor structure as shown in
FIG. 13
;
FIG. 15
is a side plan cross-sectional assembly view of the expanding sleeve anchor structure as shown in
FIG. 14
;
FIG. 16
is a front plan view of a nail base tube of the expanding sleeve anchor structure in accordance with a further embodiment of the present invention;
FIG. 17
is a front plan view of a nail base tube of the expanding sleeve anchor structure in accordance with a further embodiment of the present invention;
FIG. 18
is a front plan view of a nail base tube of the expanding sleeve anchor structure in accordance with a further embodiment of the present invention;
FIG. 19
is a front plan view of a nail base tube of the expanding sleeve anchor structure in accordance with a further embodiment of the present invention;
FIG. 20
is a front plan view of a nail base tube of the expanding sleeve anchor structure in accordance with a further embodiment of the present invention;
FIG. 21
is a front plan cross-sectional view of the conventional expanding sleeve anchor structure in accordance with the prior art; and
FIG. 22
is a front plan cross-sectional view of the expanding sleeve anchor structure in accordance with the present invention.
DETAILED DESCRIPTION OF THE INVENTION
Referring now to the drawings and initially to FIGS.
6
and
8
-
10
, an expanding sleeve anchor structure in accordance with the present invention comprises a nail base tube
5
cooperating with an urging bolt
61
and a nut
62
. The urging bolt
61
includes a tapered head
611
and an outer thread
612
.
The nail base tube
5
includes an upper section
54
provided with a plurality of separating lines
53
each having an elongated transverse hollow slot
52
substantially centered thereon which is used for reducing the stress concentration in the upper section
54
of the nail base tube
5
when the upper section
54
of the nail base tube
5
is pressed to expand outward.
The nail base tube
5
has a front end provided with a plurality of equally spaced inlet edges
51
. Each of the separating lines
53
of the nail base tube
5
includes a lower end located adjacent to a longitudinal hole
56
. A longitudinal rib
57
is formed between two adjacent longitudinal holes
56
. A recessed rib
55
is provided on the joint between the longitudinal rib
57
and the upper section
54
of the nail base tube
5
.
In operation, the nut
62
is positioned at one end of the nail base tube
5
, and the urging bolt
61
extends through the nail base tube
5
and is screwed into the nut
62
as shown in FIG.
9
. The nail base tube
5
is then inserted into the cavity
41
of the concrete wall
4
with the nut
62
abutting the wall
4
as shown in Fig.
10
. The urging bolt
61
is drawn into the upper section
54
of the nail base tube
5
to urge the upper section
54
of the nail base tube
5
outward against the inner wall of the cavity
41
of the concrete wall
4
.
The elongated transverse hollow slot
52
can be used for reducing the stress concentration of the upper section
54
of the nail base tube
5
, and the recessed ribs
55
can be used for limiting the expanding regions to a desired extent. By means of the design of the hollow slots
52
, the tapered head
611
of the urging bolt
61
can be easily pressed into the nail base tube
5
, thereby efficiently achieving complete expansion.
Referring now to
FIGS. 11 and 12
with reference to
FIGS. 7 and 8
, in accordance with another embodiment of the present invention, the expanding sleeve anchor structure used in a concrete wall for enhancing the expanding effect thereof comprises the nail base tube
5
cooperating with a bolt
71
, an urging nut
72
, and a washer
73
. The operation of the expanding sleeve anchor structure is similar to that of the first embodiment as shown in
FIGS. 9 and 10
, and will not be further described in detail.
Referring to
FIGS. 13-15
, in accordance with a further embodiment of the present invention, the hollow slot
52
has a left end provided with a notch
521
extending upward so that an outward folding region
541
is defined between the notch
521
and the separating line
53
.
When the nail base tube
5
is under compression, the outward folding region
541
defined between the notch
521
and the separating line
53
is folded outward whereby the outward folding region
541
is forced into the wall of the cavity
41
of the concrete wall
4
thereby enhancing the anchoring capability of the expanding sleeve anchor.
Referring now to
FIG. 16
, in accordance with a further embodiment of the present invention, the hollow slot
52
has a right end provided with a notch
522
extending upward so that an outward folding region
542
is defined between the notch
522
and the separating line
53
.
Referring now to
FIG. 17
, in accordance with a further embodiment of the present invention, the hollow slot
52
has a left end provided with a notch
523
extending upward in an inclined manner so that the outward folding region
543
is defined between the notch
523
and the separating line
53
.
Referring now to
FIG. 18
, in accordance with a further embodiment of the present invention, the hollow slot
52
has a left end provided with a notch
542
extending downward so that an outward folding region
544
is defined between the notch
542
and the separating line
53
.
Referring now to
FIG. 19
, in accordance with a further embodiment of the present invention, the hollow slot
52
has a right end provided with a notch
525
extending downward so that an outward folding region
545
is defined between the notch
525
and the separating line
53
.
Referring now to
FIG. 20
, in accordance with a further embodiment of the present invention, the hollow slot
58
is arranged in an oblique manner, thereby forming an outward folding region
546
.
Referring to
FIGS. 21 and 22
, the front end guide inlet
32
of the conventional nail base tube
3
as shown in
FIG. 21
has a large forging face so that the urging nut
22
is not easily drawn into the conventional nail base tube
3
through the front end guide inlet
32
. In comparison, the inlet tabs
51
of the nail base tube
5
of the present invention as shown in
FIG. 22
can be used for facilitating entrance of the urging nut
72
into the nail base tube
5
.
It should be clear to those skilled in the art that firther embodiments may be made without departing from the scope of the present invention.
Claims
- 1. An expanding sleeve anchor structure comprising:an elongated, hollow nail base tube for use with a tapered spreading member; said nail base tube being divided into an expanding region and a non-expanding region; said expanding region having one end defined by an end of said nail base tube and at an opposing end terminating at a portion of said nail base tube having at least one recessed rib; said expanding region being provided with a plurality of longitudinal separating lines; each of said separating lines provided with an elongated transverse hollow slot substantially centrally located thereon.
- 2. The expanding sleeve anchor structure as recited in claim 1, wherein said hollow slot is provided at one end with a substantially longitudinally directed notch defining an outwardly folding region between said notch and said separating line.
- 3. The expanding sleeve anchor structure as recited in claim 1, wherein said end of the expanding region corresponding to said one end of said nail base tube is provided with at least two equally spaced, longitudinally extending, inlet tabs.
US Referenced Citations (3)
Foreign Referenced Citations (1)
Number |
Date |
Country |
1525127 |
Apr 1968 |
FR |