Elongated-member-driving apparatus – With means to move or guide member into driving position – Including supply magazine for constantly urged members
Reexamination Certificate
2000-02-15
2001-02-27
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
06193127
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to an air-tight structure between a top cap and a body of a pneumatic tool.
2. Description of the Related Art
A conventional pneumatic tool is shown in FIG.
1
and generally includes a top cap
10
and a tool body
11
which includes a movable shaft
110
retractably received in a tubular part of the tool body
11
. The removable shaft
110
is actuated by pneumatic power. An air-tight structure is employed to obtain an air sealing feature between the top cap
10
and the tool body
11
. The air-tight structure includes a metal plate
16
located between the top cap
10
and the tool body
11
, a rubber seal
15
is engaged with the metal plate
16
so as to seal the abutting surface between the top cap
10
and the tool body
11
. The rubber seal
15
tends to be scraped and broken when connecting the top cap
10
and the tool body
11
. The metal plate
16
is easily deformed and air leakage between the top cap
10
and the tool body
11
can result. Although the rubber seal
15
is replaced by a PU seal in some pneumatic tools, the PU-made seal is fitted into the top cap
10
by a large force which might affect the combination of the parts of the tool. Besides, the top cap
10
is fixedly connected to the tool body
11
by extending bolts from a top of the top cap
10
and engaged with the tool body
11
. Therefore, there are a plurality of sink holes defined in the top of the top cap and the sink holes make the user's hands uncomfortable.
SUMMARY OF THE INVENTION
The present invention intends to provide an air-tight structure between a top cap and a body of a pneumatic tool, wherein the tool body has a groove defined in a top thereof and a seal is engaged with the groove. The top cap is fixedly connected to the tool body by extending bolts through the tool body from a bottom of the tool body and is threadedly connected to the top cap so that the top cap has a smooth top surface.
In accordance with one aspect of the present invention, there is provided an air-tight structure of a pneumatic tool comprising a top cap connected to a body tool in which a shaft is removably received. A plurality of threaded holes are defined in a bottom of the top cap. A plurality of passages are defined through the tool body and located in alignment with the threaded holes so that a plurality of bolts extend through the passages and are threadedly engaged with the threaded holes in the top cap. A groove is defined in a top of the tool body and a seal is received in the groove.
The object of the present invention is to provide a pneumatic tool that includes a tool body having a groove defined in a top thereof for receiving a seal therein, and a top cap which is connected to the top of the body. Bolts extend through the tool body and are threadedly engaged with the top cap so that the top surface of the top cap has no sink holes.
REFERENCES:
patent: 265618 (1882-10-01), McKay et al.
patent: 2821170 (1958-01-01), Jacobus
patent: 3434643 (1969-03-01), Wandel
patent: 3438449 (1969-04-01), Smith
patent: 3813993 (1974-06-01), Smith
patent: 4215808 (1980-08-01), Sollberger et al.
patent: 4573623 (1986-03-01), Sexton, Jr. et al.
Bacon & Thomas PLLC
Besco Pneumatic Corp.
Smith Scott A.
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