Motors: expansible chamber type – Working member position responsive motive fluid control – Working member carries part within working chamber which...
Reexamination Certificate
2002-01-24
2003-09-30
Look, Edward K. (Department: 3745)
Motors: expansible chamber type
Working member position responsive motive fluid control
Working member carries part within working chamber which...
C092S08500R, C227S130000
Reexamination Certificate
active
06626081
ABSTRACT:
FIELD OF THE INVENTION
The present invention relates to a pneumatic nailer wherein a plurality of paths are defined radially through the valve member and a seal between the cylinder and the valve is sucked tightly when the trigger is not squeezed.
BACKGROUND OF THE INVENTION
An air valve for a conventional pneumatic nailer is shown in FIG.
1
and generally includes an end cap
11
connected to a rear end of the body
15
of the nailer and a valve member
12
is movably engaged with an annular space
111
of the end cap
11
. Two seals
125
,
126
are embedded to the inner and the outer periphery of the valve member
12
and are moved along the surfaces of the annular space
111
. A cylinder
16
is received in the body
15
and has a flange
161
which is securely engaged with an inside of the body
15
. A seal
112
is connected to the valve member
12
and contacts an end of the cylinder
16
so as to seal the conjunction portion between the cylinder
16
and the valve member
12
. The end cap
11
has a tubular portion
121
which has a groove for receiving a spring
13
therein which urges the valve member
12
to let the seal
112
contact the cylinder
16
. A piston
18
is movably received in the cylinder
16
and an injection rod
19
is connected to the piston
18
. The piston
18
has a protrusion extending through the valve member
12
and contacting an end surface
122
on the tubular portion
121
. When the user squeeze the trigger of the nailer, the valve member
12
is moved toward the tubular portion
121
and pressurized air enters the cylinder
16
to move the piston
18
to inject a nail. The seals
125
,
126
will be worn out after frequent movement on the surfaces of the annular space
111
. The seal
112
hits on the cylinder
16
when the pressurized air is released from release path of the nailer and the valve member
12
is pushed back by the spring
13
. This could loosen the position of the seal
112
. The piston
18
returns back by the air flow after the nail is injected and the protrusion hits the end surface
122
of the end cap
11
. This will shank the whole assembly and leakage could happens.
SUMMARY OF THE INVENTION
In accordance with one aspect of the present invention, there is provided a air-seal structure for pneumatic nailers and the structure comprises a valve member that has a skirt portion movably engaged with an annular space of the end cap and first seals are connected to the skirt portion of the valve member. A spring is biased between the skirt portion and an inside of the annular space. A plurality of paths are defined radially through the valve member and communicate with air release passage defined in the end cap. A second seal is connected to the valve member and closes the paths. The second seal removably contacts an rear end of a cylinder in the mailer body. A cushion member is engaged with a disk member connected to an inside of the end cap and has an recess defined in a side thereof. A piston is movably received in the cylinder and an injection rod is connected to the piston. The piston has a protrusion which is disengagably engaged with the recess.
The primary object of the present invention is to provide an air-seal structure for pneumatic nailers and the structure occupies less space and effectively enhances the air-seal feature of the nailer.
REFERENCES:
patent: 5441192 (1995-08-01), Sugita et al.
patent: 5782395 (1998-07-01), Sauer
patent: 6059166 (2000-05-01), Ho et al.
patent: 6059167 (2000-05-01), Ho et al.
Chen Jack
Chiang Hsuan-Chi
Ho Roman
Basso Industry Corp.
Baxley Charles E.
Kershteyn Igor
Look Edward K.
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