Tool driving or impacting – Impacting devices – With anvil arranged to transmit torsional impact to tool
Reexamination Certificate
2000-05-08
2002-06-04
Smith, Scott A. (Department: 3721)
Tool driving or impacting
Impacting devices
With anvil arranged to transmit torsional impact to tool
C173S168000
Reexamination Certificate
active
06397954
ABSTRACT:
FIELD OF THE INVENTION
The present invention relates to a seal member for a cylinder of a pneumatic tool and the seal member is a flexible collar mounted to the cylinder. The seal device has flanges engaged with ribs on an outside of the cylinder so that the seal member is securely mounted to the cylinder.
BACKGROUND OF THE INVENTION
A conventional driving device for a pneumatic tool is shown in FIG.
1
and generally includes a head
10
connected to a base
15
, a cylinder
13
is located between the head
10
and the base
15
, and a rotary piston
14
rotatably received in the cylinder
13
. The head
10
has an inlet tube
11
and an outlet tube
12
respectively extending outward from the head
10
. A plurality of blades
141
extend radially outward from the rotary piston
14
and are engaged with an inside of the cylinder
13
. An inlet hole
131
and an outlet hole
132
are respectively defined through the cylinder
13
so that the rotary piston
14
can rotate in the piston
13
by air entering into the piston via the inlet hole
131
and releasing from the cylinder
13
via the outlet hole
132
. The efficiency of the cylinder
13
is affected by sealing between the cylinder
13
and the inside of the head
10
. Unfortunately, the conventional sealing device is a seal ring mounted to the cylinder
13
. The sealing ring only roughly seals a periphery of the cylinder
13
and this is not enough. However, the cylinder
13
usually shifted by vibration of the tool so that the positions of the inlet hole
131
and the outlet hole
132
are shifted and thereby resulting leakage.
The present invention intends to provide a seal member that is made of flexible material and securely mounted to the cylinder so as to establish a good sealing feature for the cylinder.
SUMMARY OF THE INVENTION
In accordance with one aspect of the present invention, there is provided a combination of a seal member and a cylinder for a pneumatic tool and comprising a ring-shaped cylinder in which a rotary piston is rotatably engaged. An inlet and an outlet are radially defined through the cylinder. Two first ribs respectively extend radially outward from the cylinder, and the first inlet is located between the two first ribs. Two second ribs respectively extend radially outward from the cylinder and the outlet inlet is located between the two second ribs. A seal member is mounted to the cylinder and has first hole and a second hole defined therethrough. A first flange extends radially outward from the seal member and the first hole is enclosed by the first flange. A second flange extends radially outward from the seal member and the second hole is enclosed by the second flange. The first inlet communicates with the first hole and the second inlet communicates with the second hole. The first ribs are engaged with and enclosed by the first flange, and the second ribs are engaged with and enclosed by the second flange.
The object of the present invention is to provide a seal member securely mounted to the ring-shaped cylinder by engaging flanges on the seal member with the ribs extending from the cylinder.
These and further objects, features and advantages of the present invention will become more obvious from the following description when taken in connection with the accompanying drawings which show, for purposes of illustration only, several embodiments in accordance with the present invention.
REFERENCES:
patent: 4708210 (1987-11-01), Rahm
patent: 4905772 (1990-03-01), Honsa et al.
patent: 5524715 (1996-06-01), Kimberlin et al.
Basso Industry Corp
Baxley Charles E.
Chukwurah Nathaniel
Smith Scott A.
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