U.S. patent application number 10/263748 was filed with the patent office on 2004-04-08 for expansion screw.
Invention is credited to Chen, Chih-Tsung, Huang, Pan-Ching.
Application Number | 20040067121 10/263748 |
Document ID | / |
Family ID | 32738806 |
Filed Date | 2004-04-08 |
United States Patent
Application |
20040067121 |
Kind Code |
A1 |
Huang, Pan-Ching ; et
al. |
April 8, 2004 |
Expansion screw
Abstract
An improved expansion screw and particularly an expansion screw
for securely anchoring on various types of solid walls and hollow
walls mainly includes a bolt and a nail tube. The nail tube has a
front end fastened to a nut, a middle portion formed at least one
expansion section which has carved slots formed thereon in an
annular manner, and at least one -shaped slot formed annularly
between the nut and the expansion section. Each -shaped slot has an
expansion flap located therein. Every two neighboring -shaped slots
are bridged by a longitudinal connection strip to form a bend
section. When the bolt nut at the front end of the bolt is turned
and driven to generate an inward compression, the expansion flap is
forced to extend outwards and overlap with the annular ring at the
front end of the nail tube, and the longitudinal connection strip
is bent outwards on the bend section to form a double compression
on the inner side of a construction hole in a wall to form a
secured coupling. The multiple expansion section structure thus
formed enables the invention be used in a wide variety of solid or
hollow walls to form a secured fastening to minimize construction
failure.
Inventors: |
Huang, Pan-Ching; (Changhua,
TW) ; Chen, Chih-Tsung; (Changhua, TW) |
Correspondence
Address: |
ROSENBERG, KLEIN & LEE
3458 ELLICOTT CENTER DRIVE-SUITE 101
ELLICOTT CITY
MD
21043
US
|
Family ID: |
32738806 |
Appl. No.: |
10/263748 |
Filed: |
October 4, 2002 |
Current U.S.
Class: |
411/32 |
Current CPC
Class: |
F16B 13/025 20130101;
F16B 13/124 20130101; F16B 13/061 20130101 |
Class at
Publication: |
411/032 |
International
Class: |
F16B 013/04 |
Claims
I claim:
1. An improved expansion screw, comprising: a bolt; and a nail tube
having a front end fastened to a nut, a middle portion formed at
least one expansion section which has carved slots formed thereon
in an annular manner; wherein the nail tube further has at least
one -shaped slot formed and spaced from each other between the nut
of the front end and the expansion section on the middle portion,
each -shaped slot having an expansion flap located on an inner side
thereof.
2. The improved expansion screw of claim 1, wherein every two
neighboring -shaped slots are bridged by a connection strip to form
a bend section, the bend section having an outer side to connect an
annular ring.
3. The improved expansion screw of claim 2, wherein the annular
ring has a plurality of latch lugs formed on an outer edge thereof
for soldering to a nut.
4. The improved expansion screw of claim 1, wherein the nail tube
has at least one anchor bump formed on another end thereof.
5 The improved expansion screw of claim 1, wherein each -shaped
slot borders a longitudinal connection strip to form a bend
section.
6 The improved expansion screw of claim 1, wherein the bolt has a
neck section coupled with a washer.
7 The improved expansion screw of claim 6, wherein the bolt head of
the bolt is a hexagon nut coupling with a washer.
Description
BACKGROUND OF THE INVENTION
[0001] 1. Field of the Invention
[0002] The invention relates to an improved expansion screw and
particularly an expansion screw for securely anchoring on a solid
wall or a hollow wall.
[0003] 2. Description of the Prior Art
[0004] There are a wide variety of expansion screws known in the
art. In general, they can be grouped in two types as shown in FIGS.
1 and 2. In FIG. 1, the expansion screw 10 mainly includes a bolt
11 coupling with a washer 12, a nail tube 13 and a compression cone
14. The nail tube 13 has a front section formed an expansion
section 131 to couple with the smaller end of the compression cone
14 so that when that expansion screw 10 is inserted into a
construction hole 21 of a solid wall 20 (as shown in FIG. 3) the
bolt 11 may be turned and tightened to pull the compression cone 14
into the nail tube 13 and force the expansion section 131 to expand
outwards to squeeze the inner wall of the construction hole 21 to
form anchoring. Then the bolt 11 may be used to hang or support
articles. Such type of expansion screw 10 generally is suitable
only for solid walls, but is not desirable for brick walls that
have cavities inside. FIG. 2 illustrates another type of
conventional expansion screw 10' which includes a bolt 11' coupling
with a washer 12' and a nail tube 13'. The nail tube 13' has a
front end fastened to a nut 14' to engage with the bolt 11'. The
front section of the nail tube 13' forms an expansion section 131'
which has carved slots formed thereon in an annular manner. When
the expansion screw 10' is inserted into a construction hole 21' of
a hollow wall 20', the expansion section 131' may be expanded to a
greater degree than the expansion screw 10 mentioned above.
However, it is still difficult to control the expansion section
131' to move away from the hollow portion 210' of the wall 20'. It
could happen that the extended expansion section 131' be located in
the hollow portion 210' as shown in FIG. 4 and result in not
secured coupling with the inner wall of the construction hole 21'.
In practical constructions, it is often difficult to accurately
determine whether the interior of a wall is solid or hollow, hence
to nail the expansion screw into a wall often cause construction
problems. How to resolve the problems occurred to the conventional
expansion screws and to design an improved expansion screw that is
suitable for solid walls and hollow walls thereby to effectively
overcome the troubles in construction is the goal of the present
invention.
SUMMARY OF THE INVENTION
[0005] The primary object of the invention is to provide an
improved expansion screw that is applicable to various types of
construction holes formed on a wide variety of solid walls and
hollow walls.
[0006] Another object of the invention is provide an improved
expansion screw that has a plurality of expansion flaps on an
expansion section located on the front end of the nail tube to form
a double overlap and to generate a double squeeze in the
construction hole to achieve a secured fastening.
[0007] A further object of the invention is provide an improved
expansion screw that has a plurality of expansion sections on the
nail tube so that at least one expansion section may be extended to
form a tight coupling with the interior structure of the wall to
enhance success probability of construction.
[0008] In order to achieve the foregoing objects, the invention
includes a bolt coupled with a washer and a nail tube which has a
front end fastened to a nut. The nail tube has carved slots formed
on the middle portion to form at least one expansion section.
Between the expansion section and the nut, the nail tube has a
plurality of -shaped slots formed thereon. On an inner side of each
-shaped slot, there is an expansion flap. Each the -shaped slot
borders a longitudinal connection strip to form a bend section. The
nail tube beyond the connection strip forms an annular ring with an
outer edge formed a plurality of jutting lugs for soldering a nut.
The expansion screw thus constructed has at least one expansion
section to generate expansion on a plurality of sections.
[0009] The foregoing, as well as additional objects, features and
advantages of the invention will be more readily apparent from the
following detailed description, which proceeds with reference to
the accompanying drawings.
BRIEF DESCRIPTION OF THE DRAWINGS
[0010] FIG. 1 is an exploded view of a conventional expansion
screw.
[0011] FIG. 2 is an exploded view of another type of conventional
expansion screw.
[0012] FIG. 3 is a sectional view of a conventional expansion screw
disposed in a solid wall.
[0013] FIG. 4 is a sectional view of another type of conventional
expansion screw disposed in a hollow wall.
[0014] FIG. 5 is a perspective view of the invention.
[0015] FIG. 6 is an exploded view of the invention.
[0016] FIG. 7 is a flattened view of the nail tube of the
invention.
[0017] FIG. 8 is a schematic view of the invention disposed in a
solid wall before being pulled forwards.
[0018] FIG. 9 is a schematic view of the invention disposed in a
solid wall after being pulled forwards.
[0019] FIG. 10 is a schematic view of the invention disposed in a
hollow wall before being pulled forwards.
[0020] FIG. 11 is a schematic view of the invention disposed in a
hollow wall after being pulled forwards.
[0021] FIG. 12 is a schematic view of an embodiment of the bolt and
the washer nut assembly of the invention.
DESCRIPTION OF THE PREFERRED EMBODIMENTS
[0022] Referring to FIGS. 5 and 6, the invention mainly includes a
bolt 30 which has a neck section coupling with a washer 31 and a
nail tube 40. The nail tube 40 has a front end fastened to a nut 32
for engaging with the bolt 30.
[0023] Refer to FIG. 7 for a flattened view of the nail tube 40.
The nail tube 40 may be flattened to form an extended blade 40'
which has at least one carved slot 41' formed at one end and spaced
from each other. On an upper side of the extended blade, there is
at least one -shaped slot 42' spaced from each other. Each -shaped
slot 42' has an inner side with an expansion flap, 42 formed
thereon. There is an outer strip 43' formed on the outer side of
the -shaped slot 42'. The outer strip 43' further has a plurality
of jutting lugs 431' formed on the outer edge thereof. On another
end of the extended blade 40', there is at least one jutting flap
44' formed by stamping.
[0024] Referring to FIGS. 6 and 7, the nail tube 40 is formed by
rolling the extended blade 40' longitudinally and has the spaced
carved slots 41' formed at least one expansion section 41. The
-shaped slot 42' on the upper side has the expansion flap 42
located therein and extended outwards. Every two neighboring
-shaped slots 42' are bridged by a longitudinal connection strip to
form a bend section 421. The outer strip 43' on the outer side of
the bend section 421 forms an annular ring 43 with the jutting lugs
431' formed on the outer edge thereof. The jutting flap 44' on
another end is extended outwards to form an anchor bump 44. The
jutting lugs 431' on the outer edge of the annular ring 43 is
fastened to a nut 32 by soldering for engaging with the front end
of the bolt 30 to form a completed expansion screw shown in FIG.
5.
[0025] Refer to FIGS. 8 and 9 for an embodiment of the invention
nailed in a solid wall. When the expansion screw of the invention
is inserted into a construction hole 21 on a solid wall 20 through
the end fastened to the nut 32, the anchor bump 44 located at the
outer end of the nail tube 40 is located on the outer section of
the construction hole 21 by force so that the nail tube 40 is
anchored and stationary. Then the bolt nut of bolt 30 located on
the outer side of the solid wall 20 may be turned by means of a
tool to pull the nut 32 in the axial direction to compress the
expansion section 41. The longitudinal connection strip between the
carved slots 41' is compressed axially and forces the expansion
section 41 to expand outwards to form an anchoring. Meanwhile, the
nut 32 is pulled axially to compress the inner side of the annular
ring 43 and force the longitudinal connection strip between the
-shaped carved slots 42' to bend outwards on the bend section 421.
The expansion flap 42 is also being pushed and extended outwards to
augment the expansion and to further increase the anchoring effect.
As a result, the expansion screw forms multiple forced couplings in
the construction hole 21 of the solid wall 20 (as shown in FIG.
9).
[0026] Refer to FIGS. 10 and 11 for an embodiment of the invention
nailed in a hollow wall 20'. When the expansion screw of the
invention is inserted into a construction hole 21' on the hollow
wall 20' through the end fastened to the nut 32, the anchor bump 44
located at the outer end of the nail tube 40 is located on the
outer section of the construction hole 21 by force so that the nail
tube 40 is anchored and stationary. Then the bolt nut of bolt 30
located on the outer side of the solid wall 20 may be turned by
means of a tool to pull the nut 32 in the axial direction to
compress the expansion section 41. The longitudinal connection
strip between the carved slots 41' of the expansion section 41 is
compressed and expanded outwards to form multiple section forced
couplings. Meanwhile, the nut 32 is pulled axially to compress the
inner side of the annular ring 43 and force the longitudinal
connection strip between the -shaped carved slots 42' to bend
outwards on the bend section 421. The expansion flap 42 is also
being pushed and extended outwards. Hence as long as either one
expansion section 41 or the expansion flap 42 at the front end
couples with a solid section of the construction hole 21' of the
hollow wall 20', the expansion screw can be anchored securely on
the wall (as shown in FIG. 11).
[0027] Furthermore, referring to FIG. 12, the outer bolt nut end of
the bolt 30 may be coupled with a washer 31. Or a hexagon nut 32'
may be coupled with a washer 31' to engage with the bolt 30 that
has no bolt nut formed thereon to replace the single bolt and
washer assembly.
[0028] By means of the construction and embodiment set forth above,
the expansion screw of the invention has longitudinal connection
strips located between the -shaped slots at the front section of
the nail tube to receive axial compression and be bent and expanded
outwards to form forced coupling with the solid section inside the
construction hole. Meanwhile the expansion flap in the -shaped slot
is expanded outside to augment the expansion section already
located in the wall to form forced coupling on multiple points.
Thus the expansion screw may be anchored easily and securely in the
various types of walls without causing construction defects.
[0029] While the preferred embodiments of the invention have been
set forth for the purpose of disclosure, modifications of the
disclosed embodiments of the invention as well as other embodiments
thereof may occur to those skilled in the art. Accordingly, the
appended claims are intended to cover all embodiments which do not
depart from the spirit and scope of the invention.
* * * * *