Elongated-member-driving apparatus – With means to move or guide member into driving position – Including supply magazine for constantly urged members
Reexamination Certificate
2001-09-28
2002-07-16
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
Reexamination Certificate
active
06419141
ABSTRACT:
FIELD OF THE INVENTION
The present invention relates to a top cap for power nailers and has seals fixedly engaged with flanges of the top cap and the piston is reciprocatingly moved in the top cap and does not scrape the flanges.
BACKGROUND OF THE INVENTION
A conventional top cap
1
of a power nailer is shown in FIG.
1
and generally includes a piston
2
reciprocatingly received in the interior
10
of top cap
1
. Two annular flanges
12
extend from an inside of the top cap
1
so that the tubular body of the piston
2
is movably engaged with the gap between the two annular flanges
12
. Two grooves
20
are defined in an outer periphery and inner periphery of the body so that two seals
21
are respectively engaged with the two grooves
20
. The two seals
21
are moved along the surfaces of the two annular flanges
12
when the piston
2
is moved. A communication path
13
is defined through the top cap
1
so as to push the piston
2
downward and the air escapes from the hole
11
when the piston
2
moves upward. The top cap
1
is made from Magnesium Alloy so that a metal coating is coated on the top cap
1
. The frequent movement of the seals
21
on the surface of the Magnesium Alloy wears out the metal coating so that the Magnesium Alloy becomes to be fragile.
SUMMARY OF THE INVENTION
In accordance with one aspect of the present invention, there is provided a An assembly of a top cap and a piston a power nailer. The top cap comprises a communication path defined through the top cap and communicating with an interior in the top cap so that a piston is movably received in the interior. A hole is defined through a top of the top cap and communicates with the interior. Two annular flanges extend from an inside of the top cap and an annular space is defined between the two flanges. Each of the two flanges has a groove defined therein and the two respective grooves communicate with the annular space. Two seals are respectively engaged with the two respective grooves. A tubular body of the the piston is engaged with the annular space and contacts the two seals. A spring is biased between the piston and an inside of the top cap.
The primary object of the present invention is to provide a top cap that has fixed seals in the flanges and the piston movably contacts the seals so that the flanges will not be worn out.
REFERENCES:
patent: 5110030 (1992-05-01), Tanji
patent: 5259465 (1993-11-01), Mukoyama
patent: 5485946 (1996-01-01), Jankel
patent: 5715986 (1998-02-01), Sauer
patent: 5782395 (1998-07-01), Sauer
patent: 5881941 (1999-03-01), Lai
patent: 5927584 (1999-07-01), Akiba
patent: 6059166 (2000-05-01), Ho et al.
patent: 6173963 (2001-01-01), Ho et al.
patent: 6296168 (2001-10-01), Hung
Baxley Charles E.
Smith Scott A.
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