Electric trigger assembly for staple guns

Details Electric trigger assembly for staple guns Electric trigger assembly for staple guns

2003-06-18

2004-02-24

Smith, Scott A. (Department: 3721)

Elongated-member-driving apparatus

With interlock means

C227S130000

Reexamination Certificate

active

06695194

ABSTRACT:

FIELD OF THE INVENTION
The present invention relates to an electric control trigger assembly for staple guns and can be controlled by three molds.
BACKGROUND OF THE INVENTION
A conventional staple gun is shown in FIG.
1
and generally includes a handle
1
with a main passage
11
which is connected to a source of air from a compressor (not shown) and a barrel is connected to the handle
1
with a chamber
10
defined in the barrel. A cylinder
24
is received in the barrel
10
and an end mount assembly
2
is connected to a rear end of the barrel and a nose is connected to a front end of the barrel. An end cap
22
is movably connected to an inside of the end mount assembly
2
and biased by a spring
22
so as to seal an open end of the cylinder
24
in which a piston
25
is movably received in the cylinder
24
. A magazine for receiving staples is connected to the nose. A recess
12
is defined in a wall of the handle
1
and a trigger valve
4
is received in the recess and can be activated by a trigger
5
. Pressurized air may enter the recess
12
via a gap between the valve
4
and the opening in the wall of the handle
1
and enters a tube
3
engaged with a hole
14
defined in an inside of the handle
1
and a path
20
. The pressurized air enters a space between the end cap
22
and the end mount assembly
2
via the path
20
so that the opening of the cylinder
24
sealed by the end cap
22
by the pressure in the space and the spring
21
.
When a safety plate
55
is pushed toward the trigger
5
and the trigger
5
is squeezed the shaft of the trigger valve
4
is shifted to seal the opening communicating with the recess
12
and the pressure in the space mentioned above is reduced so that the end cap
22
is pushed toward the end mount assembly
2
by the pressure in the main passage
1
. Once the end cap
22
is moved to open the open end of the cylinder
24
, the piston
25
is moved to eject a staple by a plate connected to the piston
25
from the nose. Air in the cylinder
24
is pushed out via orifices defined through the wall of the cylinder
24
into the chamber
10
. After shooting, the trigger
5
is released and the air in the chamber
10
enters the cylinder
24
again to push the piston
25
back to its original position. Simultaneously, air in the main passage
11
enters the tube
3
and the path
20
to assist the spring
21
to move the end cap
22
to seal the open end of the cylinder
24
again.
If the users want to have a continuous firing action, the trigger
5
has to be pressed all the time and then remove the safety plate
55
to the next object and press the safety plate
55
to shoot another staple. This could mis-fire the staple when the safety plate is unintentionally pushed.
The safety plate
55
and the trigger
5
are exposed and protrude from the barrel of the staple gun so that they could be tangled by other object or activated unintentionally.
The present invention intends to provide a staple gun wherein the trigger assembly is controlled by electric way so that the staple gun can be used in a continuously firing mold precisely.
SUMMARY OF THE INVENTION
In accordance with one aspect of the present invention, there is provided a staple gun which comprises a barrel with a chamber defined therein and a piston is movably received in a cylinder received in the chamber. A plate is connected to the piston and extends through a nose connected to a front end of the barrel. An end mount assembly is connected to a rear end of the barrel and an end cap movably seals an open end of the cylinder. A spring is biased between the end cap and an inside of the end mount assembly. A sensor is connected to a distal end of the nose and activated by a movement of a safety member movably mounted to the nose.
A handle is connected to the barrel and a main passage is defined in the handle. She main passage communicates with the chamber in the barrel and an opening is defined through a wall of the handle and communicates with a recess in the handle. An electro-magnetic valve is engaged with the recess and has a shaft which is movable to seal the opening. A circuit board is connected to the handle and electrically connected to the sensor and the electro-magnetic valve, wherein the circuit board, the sensor, and the electro-magnetic valve forms a circuit to control the movement of the shaft to seal the opening.
A button switch, a mold switch, an adjusting pulse switch and a battery set are connected to the circuit board. The mold switch activates various independent circuits and controls a number of reciprocating movement of the shaft of the electro-magnetic valve.


REFERENCES:
patent: 5687899 (1997-11-01), Dohi et al.
patent: 6223966 (2001-05-01), Nayrac et al.
patent: 6431429 (2002-08-01), Canlas et al.
patent: 6533156 (2003-03-01), Chang
patent: 6604664 (2003-08-01), Robinson

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