Elongated-member-driving apparatus – With means to move or guide member into driving position – Including supply magazine for constantly urged members
Reexamination Certificate
2001-09-13
2003-07-29
Smith, Scott A. (Department: 3721)
Elongated-member-driving apparatus
With means to move or guide member into driving position
Including supply magazine for constantly urged members
C227S127000, C227S128000
Reexamination Certificate
active
06598776
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a staple gun and in particular to a staple gun.
2. Description of the Prior Art
Conventionally, there are known staple guns such as those using electric power or compressed air to inject a staple into a target object.
FIG. 8
shows a staple injection nozzle
1
for injecting a staple from a staple gun into a target object. This staple injection nozzle
1
has a nozzle body
2
protruding from the front portion of the staple gun. In this nozzle body
2
, a staple injection path
3
is formed through which the stable is injected. The staple (not depicted) has a pair of pins to be struck into a target object and a linking portion connecting these pins. The pins are set in the staple injection path
3
in such a manner that the pins are directed toward the target object. The staple set in the staple injection path
3
is pushed forward from the rear end thereof by a staple driver.
The staple injection path
3
has an upper portion closed by a cover plate
4
that can be opened, enabling to remove a staple which has been bent or a plurality of staples which are jammed.
In order to fix the cover plate
4
, protrusions
5
,
5
are provided at the top of two sides of the nozzle body
2
. Bearings
9
,
9
protrude from a rear portion of the surface of the cover plate
4
having a pin
8
for receiving a hinge portion
7
of a lock lever
6
, so that both ends of a band
10
are rotatably held at both ends of the lock lever
6
.
The cover plate
4
is supported on stepped portions
11
,
11
formed on the side walls of the staple injection path
3
. With the lock lever
6
rotated around the pin
8
to be in a raised state, the linkage portion
12
of the band
10
is set over the protrusions
5
,
5
. Then, the lock lever
6
is rotated around the pin
8
to be set in a lowered state and the band
10
is in an expanded state, so that the linkage portion
12
of the band is fixed to the stepped portions
11
,
11
.
However, such a staple gun has a problem that when a staple is injected from the staple injection nozzle
1
, a staple may be subjected to a force caused by shock of the staple driver or hardness of a target object, the force tending to open, i.e., remove the cover plate
4
from the nozzle body
2
. Moreover, when a staple is jammed in the staple injection path
3
, the cover plate
4
is subjected to a force to open the cover plate
4
and a large load F is applied from the cover plate
4
directly to the linkage portion
12
of the band
10
. This causes plastic deformation of the linkage portion
12
, thereby lowering the force to push the cover plate
4
. Thus, the cover plate
4
begins to rattle, changing a staple injection orbit, which in turn easily causes a staple jam.
SUMMARY OF THE INVENTION
It is therefore an object of the present invention to provide a staple gun capable of suppressing rattle of a cover plate.
REFERENCES:
patent: 363492 (1999-07-01), None
Adachi Michiaki
Ichiba Tomofumi
Kosuge Makoto
Chapman and Cutler
Chukwurah Nathaniel
Max Co. Ltd.
Smith Scott A.
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