Tool driving or impacting – Passage in manipulating handle for drive motor motive fluid – Motive fluid control valve in handle passage
Reexamination Certificate
2002-12-27
2003-11-11
Smith, Scott A. (Department: 3721)
Tool driving or impacting
Passage in manipulating handle for drive motor motive fluid
Motive fluid control valve in handle passage
C173S168000, C173S218000
Reexamination Certificate
active
06644419
ABSTRACT:
BACKGROUND OF THE INVENTION
The present invention relates to an air-input speed regulator for pneumatic tool, and more particularly to a regulator that can be easily turned to achieve the purpose of changing a magnitude of torque force of a pneumatic tool.
To change the magnitude of torque force of a pneumatic tool through control of air intake thereof, a flow controller
2
as shown in
FIG. 1
is usually connected to a lower end of a pin-shaped air supply switch
1
, as shown in FIG.
2
. The flow controller
2
is provided at predetermined positions on a front wall with air holes
21
of different diameters, and at an internal space with a steel ball
22
and a spring
23
. When the pin-shaped air supply switch
1
is pushed to move the steel ball
22
downward, air is admitted into an air passage of the pneumatic tool via the air holes
21
located at a clearance between the steel ball
22
and a seal ring
24
around a joint of the flow controller
2
and the air supply switch
1
, so as to change the flow of air supplied to the tool. In brief, the conventional way of adjusting the torque force of a pneumatic tool is to push and turn the air supply switch
1
to open one of the air holes
21
having different diameters and thereby changes amount and speed of airflow supplied to the tool. The forming of air holes
21
of different diameters disadvantageously complicates the manufacturing of the flow controller
2
to increase the manufacturing cost thereof.
SUMMARY OF THE INVENTION
It is therefore a primary object of the present invention to provide an improved air-input speed regulator for pneumatic tool that can be more easily manufactured at reduced cost and be more conveniently operated.
To achieve the above and other objects, the air-input speed regulator for pneumatic tool of the present invention mainly includes an air intake connector having a seat and a tubular portion forward extended from the seat, and a regulating knob rotatably mounted around the connector. Front and rear air holes are axially sequentially formed on the tubular portion of the connector. The regulating knob includes a front tube portion, a front end of which is formed into a plurality of steps gradually lowered in a circumferential direction. By turning the regulating knob, one of the steps is brought to cover the rear air hole on the connector by different extent and therefore changes the amount and speed of air supplied to the pneumatic tool, and thereby regulates the torque force of the tool.
The air intake connector of the air-input speed regulator of the present invention is provided at one side of the seat with an axial channel for receiving a steel ball and a spring therein, and the regulating knob is provided along an inner wall surface with a plurality of circumferentially spaced hollow projections to each correspond to one of the steps. When the regulating knob is turned, one of the hollow projections is brought to engage with the steel ball on the connector and thereby locates the regulating knob in place relative to the connector.
REFERENCES:
patent: 4778015 (1988-10-01), Jacobsson
patent: 4834131 (1989-05-01), Austin
patent: 5163354 (1992-11-01), Bilodeau
patent: 5377769 (1995-01-01), Hasuo et al.
patent: 5901794 (1999-05-01), Schoeps et al.
patent: 5964302 (1999-10-01), Lin
patent: 6164387 (2000-12-01), Chang
Rosenberg , Klein & Lee
Smith Scott A.
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