Elongated-member-driving apparatus – With interlock means
Reexamination Certificate
2003-06-17
2004-02-17
Smith, Scott A. (Department: 3721)
Elongated-member-driving apparatus
With interlock means
C227S130000
Reexamination Certificate
active
06691907
ABSTRACT:
FIELD OF THE INVENTION
The present invention relates to a staple gun that includes a safety assembly electrically on a front end of the nose of the staple gun and connected to an electromagnetic valve which is cooperated with a trigger assembly.
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
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 seal 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 the safety assembly is located at a distal end of the nose and connected to an electromagnetic valve so that the staple gun can be activated only when the safety assembly and the trigger both are operated.
SUMMARY OF THE INVENTION
In accordance with one aspect of the present invention, there is provided a staple gun which comprises a barrel and a cylinder is received in the barrel. A piston is movably received in the cylinder and a nose is connected to a front end of the barrel. A plate connected to the piston extends through the nose. 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 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. The main passage communicates with a chamber in the barrel. A first opening and a second opening are respectively defined through a wall of the handle and respectively communicate with two recesses. A trigger valve and an electro-magnetic valve are respectively engaged with the two recesses. The trigger valve has a first shaft which movably seals the first opening and the elecro-magnetic valve has a second shaft which movably seals the second opening A trigger is connected to the first shaft so as to push the first shaft to seal the first opening.
A safety tube is movably mounted to a distal end of the nose and has a first sensor located at an end thereof A second sensor is located at nose and located corresponding to the first sensor. The second sensor is electrically connected to the electro-magnetic valve so as to move the second shaft to seal the second opening.
REFERENCES:
patent: 5687899 (1997-11-01), Dohi et al.
patent: 5881941 (1999-03-01), Lai
patent: 6223966 (2001-05-01), Nayrac et al.
patent: 6382492 (2002-05-01), Moorman et al.
patent: 6431425 (2002-08-01), Moorman et al.
patent: 6431429 (2002-08-01), Canlas et al.
patent: 6533156 (2003-03-01), Chang
patent: 6604664 (2003-08-01), Robinson
Baxley Charles E.
Smith Scott A.
LandOfFree
Combination of safety assembly and trigger assembly for... does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Combination of safety assembly and trigger assembly for..., we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Combination of safety assembly and trigger assembly for... will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-3344313