Information
-
Patent Grant
-
6585142
-
Patent Number
6,585,142
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Date Filed
Monday, December 2, 200221 years ago
-
Date Issued
Tuesday, July 1, 200321 years ago
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Inventors
-
-
Examiners
Agents
-
CPC
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US Classifications
Field of Search
US
- 227 130
- 227 113
- 227 147
- 227 10
- 227 119
- 173 132
- 173 114
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International Classifications
-
Abstract
A hammer head assembly installed in an air nailing gun to guide a striking rod to drive a U-nail into a wooden material to fix a cord member to the wooden material is constructed to include a hollow mounting base fastened to the air nailing gun, a sliding sleeve moved in and out of the bottom end of the mounting base, a nail holder coupled to the bottom end of the sliding sleeve by a coupling nut and adapted to hold a U-nail in a flat receiving slot thereof for fastening, magnets mounted in the nail holder for securing the loaded U-nail in position for driving, and a hammer rod supported on a spring inside the sliding sleeve for driving by the striking rod of the air nailing gun to force the loaded U-nail out of the nail holder into the wooden material to fix a cord member to the wooden material.
Description
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to an air nailing gun adapted to drive U-nails into a post or the like to fasten a cord member to the post and, more specifically, to a hammer head assembly for use in such an air nailing gun.
2. Description of the Related Art
In ranches or barns, people may set up wooden posts
4
around the boundary, and then fasten steel ropes
5
to the posts
4
with U-nails
2
to build a fence (see FIG.
3
). However, it is not easy to drive U-nails
2
into wooden posts
4
accurately. Because there isn't any tool specifically designed for driving this kind of U-nails into wooden materials, people usually use a hammer to drive this kind of U-nails into wooden materials. However, because the two pointed ends respectively sloping outwards, they tend to be deformed when driving into the workpiece. Further, during hammering, the hammer may strike against the fingers holding the U-nail accidentally, causing an injury.
SUMMARY OF THE INVENTION
The present invention has been accomplished under the circumstances in view. It is one object of the present invention to provide a hammer head assembly for air nailing gun, which is specifically designed for driving U-nails into wooden materials. It is another object of the present invention to provide a hammer head assembly for air nailing gun, which positively holds the loaded U-nail in position for driving. To achieve these and other objects of the present invention, the hammer head assembly comprises an externally threaded, stepped, hollow, cylindrical mounting base fastened to the air nailing gun, the mounting base having a center through hole axially extended through top and bottom ends thereof for the passing of the striking rod of the air nailing gun; a sliding sleeve inserted into the center through hole of the mounting base and partially extended out of the bottom end of the mounting base, the sliding sleeve having a center through hole axially extended through top and bottom ends thereof for the passing of the striking rod of the air nailing gun, and an outward stop flange extended from the periphery of the bottom end thereof; a first spring member mounted in the mounting base and adapted to impart a forward pressure to the sliding sleeve; a coupling nut sleeved onto the sliding sleeve and stopped above the outward stop flange of the sliding sleeve outside the mounting base, the coupling nut having an inner thread; a nail holder adapted to hold a U-nail for fastening, the nail holder having an outer thread threaded into the inner thread of the coupling nut, a flat receiving slot extended to a bottom side thereof and adapted to receive a U-nail for fastening, and a top insertion hole disposed in a top side thereof in communication with the flat receiving slot; a hammer rod mounted in the sliding sleeve and aimed at the top insertion hole of the nail holder for driving by the striking rod of the air nailing gun to force a loaded U-nail out of the nail holder into a wooden material; and a second spring member mounted inside the sliding sleeve and adapted to push the hammer rod toward the striking rod of the air nailing gun.
BRIEF DESCRIPTION OF THE DRAWINGS
FIG. 1
is an exploded view of a hammer head assembly for air nailing gun according to the first embodiment of the present invention.
FIG. 2
is a sectional view showing the hammer head assembly installed in an air nailing gun according to the first embodiment of the present invention.
FIG. 3
is a schematic drawing showing steel cord members fastened to wooden posts with U-nails.
FIG. 4
is an exploded view of the second embodiment of the present invention.
FIG. 5
is a sectional assembly view of the second embodiment of the present invention.
FIG. 6
is similar to
FIG. 5
but showing the sliding sleeve moved with the tool bit backwards against the spring member, the tool bit spaced from the striking rod at a distance.
FIG. 7
is a schematic sectional view showing the tool bit moved between the operative position and the non-operative position according to the second embodiment of the present invention.
FIG. 8
is a sectional view showing an alternate form of the tool bit according to the present invention.
FIG. 9
is a sectional view showing another alternate form of the tool bit according to the present invention.
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT
Referring to
FIGS. 1 and 2
, a hammer head assembly in accordance with the present invention is shown used in an air nailing gun
3
, and adapted to drive U-nails
2
into wooden materials to fix cord members. The hammer head assembly comprises a mounting base
1
, a first spring member
111
, a second spring member
141
, a sliding sleeve
13
, a hammer rod
14
, a retaining split ring
142
, a coupling nut
15
, and a nail holder
16
The mounting base
1
is an externally threaded, stepped, hollow, cylindrical member threaded into a bottom mounting hole (not shown) in the head of an air nailing gun
3
around a striking rod
32
being connected to the piston
31
of the air nailing gun
3
, having a center through hole
11
axially extended through the top and bottom ends thereof and a locating screw
12
transversely disposed at one side and partially perpendicularly inserted into the center through hole
11
. The sliding sleeve
13
is inserted into the center through hole
11
of the mounting base
1
from the bottom side, having a center through hole
131
axially extended through the top and bottom ends thereof for receiving the striking rod
32
of the air nailing gun
3
, a longitudinal sliding slot
132
, which receives the locating screw
12
of the mounting base
1
to limit axial movement of the sliding sleeve
13
relative to the mounting base
1
to a limited range, and an outward stop flange
133
extended around the periphery of the bottom end. The first spring member
111
is mounted in the mounting base
1
and stopped between a top part of the mounting base
1
and a top part of the sliding sleeve
13
to impart a forward pressure to the sliding sleeve
13
. The coupling nut
15
is sleeved onto the sliding sleeve
13
and stopped above the outward stop flange
133
of the sliding sleeve
13
outside the mounting base
1
to secure the nail holder
16
to the sliding sleeve
13
, having an inner thread
151
. The nail holder
16
has an outer thread
163
threaded into the inner thread
151
of the coupling nut
15
, a flat receiving slot
161
extended to the bottom side and adapted to receive a U-nail
2
for fastening, a top insertion hole
162
disposed in the top side in communication with the flat receiving slot
161
for the passing of the hammer rod
14
to drive the loaded U-nail
2
out of the nail holder
16
into the workpiece, and a plurality of magnets
164
fixedly provided inside the flat receiving slot
161
to securing the loaded U-nail
2
in position for driving, a bottom center hole
1621
coincided with the center of the bottom end of the flat receiving slot
161
in vertical alignment with the top insertion hole
162
for the passing of the hammer rod
14
. The flat receiving slot
161
has two sloping sidewalls
1611
adapted to support the two sloping arms of the loaded U-nail
2
, keeping the loaded U-nail
2
in position for driving. The hammer rod
14
is mounted in the sliding sleeve
13
, and aimed at the top insertion hole
162
of the nail holder
16
for driving by the striking rod
32
of the air nailing gun
3
to force the loaded U-nail
2
out of the nail holder
16
into the workpiece. The second spring member
41
is mounted inside the sliding sleeve
13
and connected between a lower part of the sliding sleeve
13
and the headed top end of the hammer rod
14
to impart an upward pressure to the hammer rod
14
. Further, the retaining split ring
142
is fastened to the inside of the coupling nut
15
to secure the coupling nut
15
to the sliding sleeve
13
.
FIGS. 4 and 5
show the second embodiment of the present invention. According to this embodiment, the hammer head assembly comprises a mounting base
6
, a sliding sleeve
7
, a spring member
75
, and a tool bit
8
. The mounting base
6
is an externally threaded hollow cylindrical member threaded into the a bottom mounting hole (not shown) in the head of an air nailing gun
3
around a striking rod
32
being connected to the piston
31
of the air nailing gun
3
, having a center through hole
61
axially extended through the top and bottom ends thereof and an inside annular stop flange
62
in the bottom end. The sliding sleeve
7
is inserted through the center through hole
61
of the mounting base
6
from the top, having a center through hole
72
axially extended through the top and bottom ends thereof for the passing of the striking rod
32
of the air nailing gun
3
, an outward stop flange
71
extended around the periphery of the top end and moved with the sliding sleeve
7
above the inside annular stop flange
62
of the mounting base
6
, and an inner thread
73
in the bottom end around the center through hole
72
. The spring member
75
is mounted within the mounting base
6
to impart a forward pressure to the sliding sleeve
7
. The tool bit
8
has a threaded shank
81
threaded into the inner thread
73
of the sliding sleeve
7
.
Referring to
FIGS. 6 and 7
, when the air nailing gun
3
pressed on the workpiece, the tool bit
8
forces the sliding sleeve
7
against the spring member
75
. At this time, the top end of the threaded shank
81
of the tool bit
8
is maintained spaced from the striking rod
32
at a distance, and the striking rod
32
is not pushed (see FIG.
6
). Therefore, the operator has sufficient time to adjust the position of the air nailing gun
3
and to correct the alignment between the tool bit
8
and the workpiece. When increasing the pressure to the tool bit
8
against the workpiece, the threaded shank
81
of the tool bit
8
is forced to push the striking rod
32
backwards, thereby causing the air nailing gun
3
to be switched on to reciprocate the piston
31
against the tool bit
8
and the workpiece (see FIG.
7
). Because the sliding sleeve
7
guides reciprocating motion of the striking rod
32
, continuously strike the striking rod
32
against the tool bit
8
does not damage the connection portion
321
of the striking rod
32
. When the operator removed the air nailing gun
3
from the workpiece, the spring member
75
immediately pushes the sliding sleeve
7
forwards, keeping the tool bit
8
spaced from the striking rod
32
, and therefore the air nailing gun
3
is switched off.
Further, the sliding sleeve
7
and the tool bit
8
have cut planes
74
or
82
symmetrically disposed at two opposite lateral sides for the gripping of a tool during installation.
The aforesaid second embodiment may be attached with any of a variety of tool bits.
FIGS. 8 and 9
show two different alternate forms of the tool bit. According to the embodiment shown in
FIG. 8
, the tool bit
91
has a threaded shank
92
for threading into the inner thread of the sliding sleeve
7
, and is adapted to drive a hollow nail. According to the embodiment shown in
FIG. 9
, the tool bit
93
has a threaded shank
94
for threading into the inner thread of the sliding sleeve
7
, and is adapted to hammer down a rivet
95
.
A prototype of hammer head assembly for use in an air nailing gun has been constructed with the features of
FIGS. 1 and 2
. The hammer head assembly for use in an air nailing gun functions smoothly to provide all of the features discussed earlier.
Although particular embodiments of the invention have been described in detail for purposes of illustration, various modifications and enhancements may be made without departing from the spirit and scope of the invention. Accordingly, the invention is not to be limited except as by the appended claims.
Claims
- 1. A hammer head assembly installed in an air nailing gun to guide a striking rod of the air nailing gun to drive a U-nail into a wooden material, comprising:an externally threaded, stepped, hollow, cylindrical mounting base fastened to the air nailing gun, said mounting base having a center through hole axially extended through top and bottom ends thereof for the passing of the striking rod of said air nailing gun; a sliding sleeve inserted into the center through hole of said mounting base and partially extended out of the bottom end of said mounting base, said sliding sleeve having a center through hole axially extended through top and bottom ends thereof for the passing of the striking rod of said air nailing gun, and an outward stop flange extended from the periphery of the bottom end thereof; a first spring member mounted in said mounting base and adapted to impart a forward pressure to said sliding sleeve; a coupling nut sleeved onto said sliding sleeve and stopped above the outward stop flange of said sliding sleeve outside said mounting base, said coupling nut having an inner thread; a nail holder adapted to hold a U-nail for fastening, said nail holder having an outer thread threaded into the inner thread of said coupling nut, a flat receiving slot extended to a bottom side thereof and adapted to receive a U-nail for fastening, and a top insertion hole disposed in a top side thereof in communication with said flat receiving slot; a hammer rod mounted in said sliding sleeve and aimed at the top insertion hole of said nail holder for driving by the striking rod of said air nailing gun to force a loaded U-nail out of said nail holder into a wooden material; and a second spring member mounted inside said sliding sleeve and adapted to push said hammer rod toward the striking rod of said air nailing gun.
- 2. The hammer head assembly as claimed in claim 1 wherein the flat receiving slot of said nail holder having two sloping sidewalls fitting the profile of the U-nail to be loaded in said nail holder for fastening.
- 3. The hammer head assembly as claimed in claim 1 wherein said nail holder further comprises a plurality of magnets fixedly provided inside said flat receiving slot for securing the loaded U-nail in position for driving.
- 4. The hammer head assembly as claimed in claim 1 wherein said sliding sleeve has a longitudinal sliding slot, and said mounting base has a locating screw inserted into the longitudinal sliding slot of said sliding sleeve to limit axial movement of said sliding sleeve to a predetermined range.
- 5. The hammer head assembly as claimed in claim 1 wherein said nail holder has a bottom center hole coincided with the center of a bottom end of said flat receiving slot and aligned with said top insertion hole for the passing of said hammer rod.
- 6. A hammer head assembly installed in an air nailing gun to guide a striking rod of the air nailing gun to hammer a fastening element, comprising:an externally threaded, stepped, hollow, cylindrical mounting base fastened to the air nailing gun, said mounting base having a center through hole axially extended through top and bottom ends thereof for the passing of the striking rod of said air nailing gun; and an inside annular stop flange in the bottom end thereof; a sliding sleeve mounted in said mounting base and partially extended out of the bottom end of said mounting base, said sliding sleeve having a center through hole axially extended through the top and bottom ends thereof for the passing of the striking rod of said air nailing gun, an outward stop flange extended around the periphery of the top end thereof for stopping above the inside annular stop flange of said mounting base, and an inner thread in the bottom end around the center through hole of said sliding sleeve; a spring member mounted within said mounting base to impart a forward pressure to said sliding sleeve; and a tool bit, said tool bit having a threaded shank threaded into the inner thread of said sliding sleeve.
- 7. The hammer head assembly as claimed in claim 6 wherein said sliding sleeve has two cut planes symmetrically at two opposite lateral sides for the gripping of a hand tool.
- 8. The hammer head assembly as claimed in claim 6 wherein said tool bit has two cut planes symmetrically disposed at two opposite lateral sides for the gripping of a hand tool.
US Referenced Citations (7)