Information
-
Patent Grant
-
6592016
-
Patent Number
6,592,016
-
Date Filed
Friday, January 12, 200123 years ago
-
Date Issued
Tuesday, July 15, 200320 years ago
-
Inventors
-
Original Assignees
-
Examiners
Agents
- Morgan, Lewis & Bockius LLP
-
CPC
-
US Classifications
Field of Search
US
- 227 119
- 227 120
- 227 135
- 227 136
-
International Classifications
-
Abstract
A fixing pin is attached to a winding end of a spring attached to a pusher of a nailing machine. A fixing plate with an engaging hole is engaged with the fixing pin from the outside of an opening of a magazine. The fixing pin is guided to a tapering section of the opening by moving the fixing plate in the direction of a nose section of the nailing machine to fix the fixing plate. Further, a magazine has a guide groove for guiding a T-shaped top portion formed at an upper end of the pusher and for guiding head portions of connected nails in an upper portion of a guide path of the pusher and the connected nails. A cover made of iron is attached to the inside of the guide groove. Thickness of a part of the pusher is smaller than the diameter of nail axis portions.
Description
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a structure of a nailing machine. Especially, the present invention relates to a structure for mounting a spring (spiral spring) for a pusher of a nailing machine in which the spring for pushing the pusher in the direction of a nose section can be easily replaced. Further, the present invention relates to a structure of a guide for a pusher of a magazine of a nailing machine for guiding the pusher to push connected nails charged into the magazine in the longitudinal direction of the magazine.
2. Description of the Related Art
Conventionally, a spring (spiral spring) for pushing a pusher in the direction of a nose is fixed to a magazine with the following. A fixing pin is attached to a winding end section of the spring. In order to install the winding end of the spring into a magazine, a head portion of the fixing pin is protruded from an opening formed on a wall face of the magazine. The profile of the opening is formed being tapered in such a manner that the width on the side of a nose section is wide and the width on the side opposite to the nose section is narrow. Then, the magazine is moved to the side of the nose section so that the fixing pin is guided into the tapering section and the magazine is fixed to the nose section. In this way, the spring is fixed with being interposed between the nose section and the magazine.
However, when the above spring is used over a long period of time, it fatigues and the elasticity of the spring deteriorates and further the spring breaks. When the spring is replaced to solve the above problems, in order to release the fixing pin attached to the winding end of the spring, it is necessary to separate the magazine from the nose section. Accordingly, it takes time and labor to replace the spring.
As another aspect of a nailing machine, in general, the magazine of a nailing machine is provided for pushing and supplying connected nails, which are charged into the magazine, to a nose section side by a pusher. Therefore, the magazine has a guide path for guiding the connected nails and the pusher which pushes the connected nails onto the nose section side of the nailing machine. This guide path is a common guide means for guiding both the connected nails and the pusher. Therefore, when the connecting nails and the pusher are slid in the guide path, they move in the guide path while they are rubbing an inner wall face of the guide path.
The magazine is usually made of aluminum or aluminum alloy. Therefore, the abrasion resistance and mechanical strength of the magazine are relatively low. On the other hand, the connected nails and pusher, which are made of iron, are subjected to surface treatment. The cost of surface treatment of the connected nails is low, and the mechanical strength of the connected nails is not so high; however, since the pusher is frequently slid in the case of feeding and charging the nails, in order to prevent the pusher from wearing away, the pusher is subjected to quenching. Accordingly, since the surface hardness of the pusher is higher than that of the guide groove, when the pusher frequently slides in the guide groove, the surface of the guide groove is damaged. The thus caused damage becomes a resistance when the nails are fed, which could be a cause of failure of feeding the nails. Consequently, it is necessary to conduct an expensive surface treatment on the magazine.
SUMMARY OF THE INVENTION
The present invention has been accomplished to solve the above problems. That is, a first object of the present invention is to provide a structure for mounting a spring for a pusher of a nailing machine in which the spring for pushing the pusher can be easily replaced.
In order to attain the first object, the present invention provides a structure for mounting a spring for a pusher of a nailing machine in which a straight sheath-shaped magazine is connected with a nose section for driving a nail, and nails connected in a stick-shape are successively supplied into the nose section by a pusher arranged in the magazine, and the nails are driven from the nose section by a driver connected with a piston, wherein
a fixing pin is attached to a winding end section of a spring which is attached to the pusher and pushes the pusher in the direction of the nose section; a head portion of the fixing pin is protruded from an opening, the profile of which is tapered to the nose section side on the side of the magazine close to the nose section, and
a fixing plate, on which an engaging hole is formed, is engaged with the head portion of the fixing pin from the outside of the opening, and
the fixing pin is guided to the tapering section of the opening by moving the fixing plate in the direction of the nose section so as to fix the fixing plate to the nose section.
Further, the second object of the present invention is to provide a structure of a guide for a pusher of a magazine of a nailing machine characterized in that the surface of the guide path of the magazine is seldom damaged even if the magazine is not subjected to surface treatment, the cost of which is especially high.
In order to attain the second object, the present invention provides a structure of a guide for a pusher of a magazine of a nailing machine for guiding the pusher to push connected nails charged into the magazine toward a nose section of the nailing machine, wherein
the magazine has a guide groove for guiding a T-shaped top portion formed at an upper end of the pusher and for guiding head portions of the connected nails in an upper portion of a guide path of the pusher and the connected nails, and
a cover made of iron is attached to the inside of the guide groove, and
the wall thickness of a portion of the pusher passing through the nail guide path is smaller than the diameter of a nail axis portions.
BRIEF DESCRIPTION OF THE DRAWINGS
FIG. 1
is a side view of a nailing machine.
FIGS.
2
(
a
) and
2
(
b
) are bottom views showing a primary portion which is cut out.
FIGS.
3
(
a
) and
3
(
b
) are side views for explaining a structure for mounting a spring.
FIGS.
4
(
a
),
4
(
b
) and
4
(
c
) are views for explaining forms for fixing a spring.
FIG. 5
is a longitudinal cross-sectional view showing a periphery of a nose section of a nailing machine.
FIG. 6
is a cross-sectional view taken on line I—I in FIG.
5
.
FIG. 7
is a cross-sectional view taken on line II—II in FIG.
5
.
FIG. 8
is an enlarged view of FIG.
7
.
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS
A first embodiment of the present invention is descried in detail with reference to
FIGS. 1
to
4
.
FIG. 1
is a view showing a nailing machine of the present invention. In this nailing machine, there is provided a driving cylinder
2
in the body
1
. A driving piston
3
moving up and down in the cylinder is integrally connected with a driver
4
, and compressed air supplied into a grip
5
is supplied into the cylinder
2
, so that the driving piston
3
can be driven. At the forward end of the body
1
, there is provided a nose section
7
, which is extended from the forward end of the body
1
, for slidably guiding the driver
4
, and the nose section
7
is provided with a driving port from which nails are driven. On the side of the nose section
7
, an end section of a straight sheath-shaped magazine
8
for accommodating connected nails, which are connected with each other being formed into a linear shape, is connected. Therefore, nail A supplied from the magazine
8
is driven from an end of the driving port
9
when it is driven by the driving piston
3
.
In the above magazine
8
, there is provided a pusher
10
for pushing out a nail, which is charged in the magazine
8
, into the driving port of the nose section
7
. As shown in FIG.
2
(
a
), the pusher
10
is slidably arranged in the longitudinal direction of the magazine
8
. In a drum
12
pivotally supported by a central shaft
11
of the pusher
10
, one end of a spring
13
(spiral spring) at which the spring
13
starts winding is fixed, and the other end at which the spring
13
finishes winding is fixed at the nose section
7
via a fixing plate
14
. Therefore, the pusher
10
is always pushed in the direction of the nose section
7
by a returning winding force generated by the spring
13
, and nails A accommodated in the magazine
8
can be successively supplied into the driving port
9
of the nose section
7
by a pushing protrusion
10
a
protruded at the end.
A fixing pin
15
is clamped at the end portion of the spring
13
at which the spring
13
finishes winding. A head portion
15
a
of the fixing pin
15
is formed being expanded. The head portion
15
a
of the fixing pin
15
protrudes outside from an opening section
16
formed on the side of the magazine
8
.
As shown in FIG.
3
(
a
), the opening
16
is formed into a tapering shape in which the width of a forward end toward the nose section
7
is narrower than the width of a rear end off the nose section
7
. The width of the tapering section
16
a
is narrower than the width of the head portion
15
a
of the fixing pin
15
. The wide width section
16
b
is wider than the width of the head portion
15
a
of the fixing pin
15
. Therefore, when the fixing pin
15
protruding from the wide width section
16
b
is guided into the tapering section
16
a
, the head portion
15
a
of the fixing pin
15
is caught by the tapering section
16
a
. Therefore, the fixing pin
15
can not be pulled out.
As shown in FIG.
3
(
a
), the fixing plate
14
is a metallic sheet member on which an engaging hole
17
is formed so that the head portion
15
a
of the fixing pin
15
can penetrate the engaging hole
17
. The fixing plate
14
is fixed to the nose section
7
with a bolt
18
. While the head portion
15
a
of the fixing pin
15
is protruded from the engaging hole
17
, the fixing plate
14
is moved in the direction of the nose section
7
, so that an axial section of the fixing pin
15
is guided into the tapering section
16
a
of the opening
16
. While the axial section is contacted with a forward end of the tapering section
16
a
of the opening
16
, the bolt
18
is screwed to the nose section
7
so as to fix the fixing pin
15
. Due to the foregoing, the end portion of the spring
13
at which the spring
13
finishes winding can be fixed to the magazine
8
. (See FIG.
3
(
b
))
An operation lever
19
is arranged on the side of the pusher
10
in such a manner that the operation lever
19
protrudes outside the magazine
8
. When the operation lever
19
is pulled backward resisting a force of the spring
13
, the pushing of nails A can be released as shown in FIG.
2
(
b
).
According to the structure for mounting a spring described above, the winding end of the spring
13
is fixed to the magazine
8
in the following manner. As shown in FIG.
4
(
a
), the head portion
15
a
of the fixing pin
15
, which is clamped at the winding end, is protruded outside from the wide width section
16
b
of the opening
16
of the magazine
8
. Then, as shown in FIG.
4
(
b
), the head portion
15
a
of the fixing pin
15
, which is protruded outside from the opening
16
, is engaged with the engaging hole
17
of the fixing plate
14
from the outside of the magazine
8
. While the head portion
15
a
is protruded from the engaging hole
17
, the fixing plate
14
is moved toward the nose section
7
, so that the axial section of the fixing pin
15
is guided until it comes into contact with the forward end of the tapering section
16
a
of the opening
16
, and the fixing plate
14
is fixed to the nose section
7
with the bolt
18
. (See FIG.
4
(
c
))
In the case where something is wrong with the spring
13
, the bolt
18
is detached so as to release the fixing plate
14
, and the fixing pin
15
is moved from the tapering section
16
a
of the opening
16
to the wide width section
16
b
. Due to the foregoing, the fixing pin
15
can be released. In this way, the spring
13
can be released without detaching the magazine
8
. Therefore, the spring
13
can be easily replaced.
According to the first embodiment of the present invention, when something is wrong with the spring of the pusher and it becomes necessary to replace the spring, it is possible to release the spring only when the bolt for fixing the fixing plate is disconnected. Therefore, it is unnecessary to take the magazine apart into pieces, and it is possible to replace the spring easily. Accordingly, any problems are avoided when the spring is replaced.
Next, a second embodiment of the present invention is descried in detail with reference to
FIGS. 5
to
8
.
Reference numeral
101
shown in
FIG. 5
is a nose section of a nailing machine. The nose section
101
is a cylindrical member extending to a lower portion of the nailing machine body
102
. The nose section
101
guides a sliding motion of the driver
103
which is driven by a driving mechanism (not shown) provided in the nailing machine body
102
. At the same time, the nose section
101
opens to a forward end of the magazine
104
and accommodates the lead nail
105
a
of connected nails
105
which are charged into the magazine
104
. The lead nail
105
a
driven by the driver
103
can be guided by the nose section
101
in the direction of driving.
The connected nails
105
are composed in such a manner that a large number of nails
105
n
are connected with each other and formed into a stick-shape via the connecting member
106
. The connected nails
105
are connected with each other while the head portions
105
p
of the nails
105
n
are being superposed on each other. The connecting member
106
is made of synthetic resin, wire or paper. The connected nails
105
, which are charged into the magazine
104
, are a little tilted with respect to the nose section
101
. The connected nails
105
are not limited to the above eccentric nails, but it is possible to use nails, the head portions of which are circular and superposed on each other with being connected with each other via the connecting member.
In the magazine
104
, there is provided a pusher
107
. The pusher
107
pushes forward the connected nails
105
at all times by a force of the constant output spring
108
, so that the connected nails
105
can be supplied to the nose section
101
. As shown in
FIGS. 6 and 7
, at a central rear portion of the plate-shaped pushing section
107
a
, there is provided a box-shaped accommodating section
109
for accommodating a constant output spring
108
. At an upper portion of the box-shaped accommodating section
109
, there is provided an upper protrusion
110
, and at a lower portion of the box-shaped accommodating section
109
, there is provided a lower protrusion
111
. At an upper end of the pushing section
107
a
, there is provided a T-shaped top section
112
, the cross section of which is a T-shape. The front end face
113
(shown in
FIG. 5
) of the pushing section
107
a
is formed into an inclined face, the inclination of which is the same as that of the connected nails
105
charged into the magazine
104
. The wall thickness of the pushing section
107
a
is smaller than the diameters of the nail axis portions of the connected nails
105
. One end of the above constant output spring
108
is fixed to a front end portion of the magazine
104
.
At the center of the magazine
104
, there is provided a guide path
114
for slidably guiding the connected nails
105
and pusher
107
in the longitudinal direction. On one side wall of the intermediate section of the guide path
114
, there is provided an expanding section
115
a
which expands to the side so that the box-shaped accommodating section
109
of the pusher
107
can be accommodated in it. On the other side wall, there is provided an opening
115
b
so that the box-shaped accommodating section
109
can be exposed to the side. In an upper portion of the guide path
114
, there is provided a guide groove
116
for guiding the T-shaped top section
112
of the pusher
107
and the nail head portions
105
p
of the connecting nails
105
, that is, the upper portion of the guide path
114
is formed into a groove-shape. In an upper portion and a lower portion of the portion in which the box-shaped accommodating section
109
is accommodated, there are provided throttled sections
119
,
120
, the width of which is narrow, which are formed via the recesses
117
,
118
receiving the protrusions
110
,
111
of the pusher
107
. An width of both the throttled sections
119
,
120
is set at a value a little larger than the diameters of the nail axis portions of the connected nails
105
.
A cover
121
made of iron is installed inside the above guide groove
116
. The cover
121
is arranged over the entire length of the guide groove
116
.
According to the above structure, the nail head portions
105
p
of the connected nails
105
charged in the magazine
104
and the T-shaped top section
112
of the upper end of the pusher
107
are engaged with the guide groove
116
, and the nail axis portions of the connected nails
105
and the pusher
107
are accommodated in the guide path
114
, and further the box-shaped accommodating section
109
of the pusher
107
is accommodated inside the expanding section
115
a
. In this case, concerning the connected nails
105
and the pusher
107
, the nail head portions
105
p
and the T-shaped top section
112
are hung down with being engaged with the guide groove
116
. Since the magazine
104
is open to the nose section
101
, the lead nail
105
a
of the connected nails
105
is pushed by the pusher
107
and supplied to the nose section
101
. Therefore, when the driving mechanism is operated, the lead nail
105
a
in the nose section
101
is driven by the driver
103
and shot out from the nose section
101
. When the driver
103
returns to the initial position, the next lead nail is sent to the nose section
101
. In the case of supplying the nails, the pusher
107
and the connected nails
105
are slid in the magazine
104
.
When the pusher
107
and the connected nails
105
slide in the magazine
104
, as shown in
FIG. 8
, the nail heads and the T-shaped top section
112
of the pusher
107
come into contact with the cover
121
made of iron, the abrasion resistance of which is high. Therefore, the nail heads and the T-shaped top section
112
of the pusher
107
slide smoothly and seldom damage. Accordingly, even when the device is used over a long period of time, the performance of feeding the connected nails
105
seldom deteriorates.
The protrusions
110
,
111
of the pusher
107
are engaged with the inner sidewalls of the recesses
117
,
118
of the magazine
104
, so that deviation of the pusher
107
to the side can be prevented. The wall thickness of the pushing section
107
a
of the pusher
107
is smaller than the diameters of the nail axis portions of the connected nails
105
. A width of the upper and the lower throttled sections
119
,
120
of the portion in which the box-shaped accommodating section
109
of the pusher
107
is accommodated is set at a value a little higher than the diameters of the nail axis portions of the connected nails
105
. Accordingly, in the case of sliding, the nail axis portions of the connected nails
105
come into contact with the inner side faces of the throttled sections
119
,
120
; however, the pushing section
107
a
of the pusher
107
do not come into contact with the same.
In the case of sliding, there is a possibility that the protrusions
110
,
111
of the pusher
107
come into contact with the inner walls of the recesses
117
,
118
. However, the pusher
107
itself is hung from the guide groove
116
. Therefore, when the pusher
107
itself is hung from the guide groove
116
, even if the protrusions
110
,
111
come into contact with the inner side walls of the recesses
117
,
118
of the magazine
104
, the contacting forces are so weak that the inner side walls of the recesses
117
,
118
are not damaged. In the case where the connected nails
105
come into contact with the inner sides of the throttled sections
119
,
120
, the circumstances are the same. Even if the nail axis portions of the connected nails
105
, which are hung from the guide groove
116
, come into contact with the throttled sections
119
,
120
, the throttled sections
119
,
120
are seldom damaged.
As described above, when the cover
121
made of iron, the cost of which is not high, is attached inside the guide groove
116
, sliding can be conducted more smoothly, and the performance of feeding the connected nails
105
can be enhanced. Further, since the guide groove
116
is seldom damaged, it is unnecessary to conduct an especially expensive surface treatment on the magazine
104
.
While only a certain embodiment of the invention has been specifically described herein, it will be apparent that numerous modifications may be made thereto without departing from the spirit and scope of the invention.
Claims
- 1. A guide and pusher structure of a magazine of a nailing machine for guiding the pusher to push connected nails charged into the magazine toward a nose section of the nailing machine, whereinthe magazine has a dovetail-shaped guide groove for guiding a T-shaped top portion formed at an upper end of the pusher and for guiding head portions of the connected nails in an upper portion of a guide path of the pusher and the connected nails, and a cover made of iron is attached to the inside of the guide groove, and a portion of the pusher passing through the guide path has a wall thickness that is smaller than the diameter of the axis portion of the connected nails.
- 2. The guide and pusher structure of claim 1, wherein at least the head portions of the connected nails are made of the same material as the cover.
- 3. The guide and pusher structure of claim 1, wherein the pusher includes a box-shaped section.
- 4. The guide and pusher structure of claim 3, wherein the box-shaped section accommodates a spring for pushing the pusher.
- 5. The guide and pusher structure of claim 3, wherein the pusher further comprises:an upper protrusion provided at an upper portion of the box-shaped section; and a lower protrusion provided at a lower portion of the box-shaped section.
- 6. The guide and pusher structure of claim 5, wherein the magazine further includes:an upper recess that receives the upper protrusion; a lower recess that receives the lower protrusion.
- 7. The guide and pusher structure of claim 6, wherein the upper protrusion is engaged with an inner side wall of the upper recess, and the lower protrusion is engaged with an inner side wall of the lower recess in order to prevent deviation of the pusher to a side.
Priority Claims (2)
Number |
Date |
Country |
Kind |
P2000-005057 |
Jan 2000 |
JP |
|
P2000-005058 |
Jan 2000 |
JP |
|
US Referenced Citations (8)
Foreign Referenced Citations (3)
Number |
Date |
Country |
2000-005057 |
Jan 2000 |
JP |
2000-005058 |
Jan 2000 |
JP |
242813 |
Mar 1995 |
TW |