Elongated-member-driving apparatus – With means to move or guide member into driving position – Including supply magazine for constantly urged members
Reexamination Certificate
2002-09-09
2003-03-18
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
C227S008000
Reexamination Certificate
active
06533156
ABSTRACT:
FIELD OF THEE INVENTION
The present invention relates to a pneumatic nail gun that has a chamber communicating with an interior of a cylinder and the air in the cylinder is pushed into the chamber when ejecting a nail. The air in the chamber pushes the piston back quickly when the trigger is released.
BACKGROUND OF THE INVENTION
A conventional pneumatic nail gun is shown in FIG.
1
and generally includes a cylinder
241
received in the body of the gun, a handle
1
with a main passage
11
connected the body, and a trigger valve
50
movably received in a space
12
of the handle
1
. The cylinder
241
has a pushing member
22
movably connected to an end thereof and a spring
21
is engaged between the pushing member
22
and an end cap
2
which is fixed to the body of the gun. The pushing member
22
movably seals an end of the cylinder
241
by the spring
21
. The main passage
11
communicates with a space defined between the cylinder
241
and the pushing member
22
and a hole
13
defined through a wall of the handle
1
so as to communicate the main passage
11
and the space
12
. A tube
3
is connected between the space
12
and the end cap
2
, and a first passage
20
is defined in the end cap
2
and communicates with a space between the end cap
2
and the pushing member
22
. The pushing member
22
is pushed by the spring
21
and the air pressurized coming from the first passage
20
so that the piston
25
is located at the ready-to-fire position as shown.
Referring to
FIGS. 2 and 3
, when the safety member
55
is pushed and the trigger
5
is pulled, the trigger valve
50
is moved to seal the hole
13
so that the pressurized air in the space between the end cap
2
and the pushing member
22
disappeared such that the pushing member
22
is pushed toward the end cap
2
and removed away from the end of the cylinder
241
by the pressurized air coming through slots
230
of a base
23
mounted to the cylinder
241
. The pressurized air enters into the cylinder
241
to push the piston
25
from the gap resulted from the movement of the pushing member
22
so that a nail is ejected by the ejection plate connected to the piston
25
. The air in the cylinder
241
is forced to be released into a space
100
between the cylinder
241
and the in side of the body of the gun via holes
240
defined through the cylinder
241
.
Referring to
FIG. 4
, when releasing the trigger
5
, the pressurized air reaches the space between the pushing member
22
and the end cap
2
again via the first passage
20
so that the pushing member
22
is pushed to seal the end of the cylinder
241
again by the force of the spring
21
and the pressurized air. The piston
25
is pushed back to its ready-to-fire position by the air in the space
100
via the holes
240
of the cylinder
241
.
The size of the cylinder is limited by the diameter of the body of the gun and if larger nails are to be ejected, a bigger body of the gun is required to receive a larger cylinder, and this makes the whole nail gun to be bulky and heavy. Besides, the structure is so complicated and involves too many parts which are not convenient to be maintained.
The present invention intends to provide a pneumatic gun that guides the air to be released when pulling the trigger to push the piston back more quickly.
SUMMARY OF THE INVENTION
The present invention relates to a pneumatic nail gun and comprises a cylinder in a body of the gun and an end cap is fixed to connected a rear end of the body. A barrel is connected to a front of the body and a piston is movably received in the cylinder. An ejection plate is connected to the piston and movably inserted in the barrel.
A pushing member movably seals a first end of the cylinder and a spring is biased between the pushing member and the end cap. A second passage and a third passage are respectively defined through the end cap. The third passage communicates with a space defined between the cylinder and an inside of the body of the gun. An opening is defined in a second end of the cylinder and in communication with the space between the cylinder and the inside of the body of the gun and an interior of the cylinder.
A handle with a main passage is connected to the body and a trigger valve is received in a space in the handle. A hole is defined through the handle and communicates with the space and the main passage. A tube is located across the main passage and in communication with the second passage. A fourth passage is defined in the handle and communicates with the space.
The primary object of the present invention is to provide a pneumatic nail gun wherein the piston can be moved back to its ready-to-fire position quickly, and the gun allows a larger area piston operated in a compact body of the gun.
REFERENCES:
patent: 5485946 (1996-01-01), Jankel
patent: 5782395 (1998-07-01), Sauer
patent: 5881941 (1999-03-01), Lai
patent: 6059166 (2000-05-01), Ho et al.
patent: 6296168 (2001-10-01), Hung
patent: 6371348 (2002-04-01), Canlas et al.
patent: 6419141 (2002-07-01), Wang
Baxley Charles E.
Smith Scott A.
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