Trigger assembly for staple guns

Details Trigger assembly for staple guns Trigger assembly for staple guns

2003-06-17

2004-02-24

Smith, Scott A. (Department: 3721)

Elongated-member-driving apparatus

With interlock means

C227S130000

Reexamination Certificate

active

06695193

ABSTRACT:

FIELD OF THE INVENTION
The present invention relates to a staple gun that includes an electro-magnetic valve which activates a shaft to seal an opening communicating with the main passage so as to change the path of the pressurized air to eject the staple.
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
′ defied 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 font 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
is sealed by the end cap
22
by the pressure in the space and the spring
21
.
Referring to
FIGS. 2 and 3
, 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
11
′. 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
′. Referring to
FIG. 4
, 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 seat the open end of the cylinder
24
again.
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 path of the pressurized air is changed simply by moving a shaft of an electro-magnetic valve and the shooting processes are simplified and convenient for the users especially for continuously shooting.
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 cylinder received in a chamber of the barrel and an end mount assembly is connected to a rear end of the barrel. An end cap movably seals an open end of the cylinder and a spring is biased between the end cap and an inside of the end mount assembly.
A handle is connected to the barrel and a main passage is defined in the handle so as to be connected to a compressor. The main passage communicates with the chamber in the barrel and an opening which is defined through a wall of the handle. A recess is defined in the handle for receiving an electro-magnetic valve therein and communicates with the opening. The electro-magnetic valve has a shaft which is movable to seal the opening when the electro-magnetic valve is activated. A switch is received in the handle and electrically connected to the electro-magnetic valve. A button is connected to the switch and exposed from the outside of the handle.
A tube is transversely received in the main passage. A first path is defined in the handle and communicates with the recess and a second path in the tube. A third path is defined in the end mount assembly and communicates with the second path and a space defined between the end cap and the end mount assembly.


REFERENCES:
patent: 5687899 (1997-11-01), Dohi et al.
patent: 6059166 (2000-05-01), Ho et al.
patent: 6223966 (2001-05-01), Nayrac et al.
patent: 6382492 (2002-05-01), Moorman 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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