Gear cutting – milling – or planing – Milling – Randomly manipulated – work supported – or work following device
Reexamination Certificate
2000-02-17
2001-07-24
Wellington, A. L. (Department: 3722)
Gear cutting, milling, or planing
Milling
Randomly manipulated, work supported, or work following device
C279S157000, C408S113000, C408S124000, C408S702000, C409S218000, C451S295000, C451S359000
Reexamination Certificate
active
06264408
ABSTRACT:
BACKGROUND OF THE INVENTION
The present invention relates to a pneumatic tool kit in which the main body is able to couple with four kinds of tools.
FIGS. 7 and 8
show a conventional pneumatic tool. A motor (not shown) is installed on a main body
9
. A shaft of the motor
91
downward extends to couple with a grinding member
92
. A threaded plug
93
is screwed into the main body
9
to fix the motor in the main body. The threaded plug
93
has two plane faces as driving sections
94
. A free end of the threaded plug
93
is locked with a decorative ring
95
. The grinding member
92
is driven by the motor to grind a work piece.
In comparison with an electric tool, the pneumatic tool must be equipped with an air compressor (not shown). The motor of the electric tool is operated at very high rotational speed, while having insufficient torque. Therefore, when the electric tool cuts a work piece, the load is relatively high and no heat-radiating design is provided. As a result, the coil of the rotor of the motor tends to burn down due to over-heating and other parts tend to malfunction. Moreover, the manufacturing cost of the electric tool is relatively high. However, the existing pneumatic tool can be only used for engraving and cannot be used as other tools. Therefore, the using range of the existing pneumatic tool is limited and although the pneumatic tool has longer and more stable using life, the pneumatic tool is still not so widely used as the electric tool.
SUMMARY OF THE INVENTION
It is therefore a primary object of the present invention to provide a pneumatic tool kit in which the main body is formed with a tool hole and disposed with a connecting seat which cooperate with a grinding member, a protective cover, a saw disk seat, an adjustment seat, an edge-milling tool, a stopper board and a drilling/milling tool, whereby four different kinds of tools for different usages including engraving, cutting, edge-milling and drilling can be selectively installed on the main body. Therefore, the main body is usable for four kinds of usages so that the manufacturing cost for the tool is lowered. In addition, by means of the pneumatic motor of the main body, the tool kit has longer and more stable using life.
The present invention can be best understood through the following description and accompanying drawings wherein:
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Lung Hui Ping
Yang Shu Yi
Carter Monica S.
Rosenberg , Klein & Lee
Wellington A. L.
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