Gear cutting – milling – or planing – Milling – With means to protect operative or machine
Reexamination Certificate
2001-05-29
2004-10-26
Briggs, William (Department: 3722)
Gear cutting, milling, or planing
Milling
With means to protect operative or machine
C144S136950, C144S252100, C409S137000, C451S456000
Reexamination Certificate
active
06808341
ABSTRACT:
FIELD OF THE INVENTION
The present invention relates to a pneumatic edge trimming machine, and especially to a pneumatic edge trimming machine which can absorb dust in working.
BACKGROUND OF THE INVENTION
Referring to
FIGS. 5 and 6
, a prior art electric edge trimming machine is illustrated. A base
9
is installed with a motor
91
. A shaft of the motor
91
protrudes downwards to be connected to a cutting knife
92
. A trench
93
is formed in the base
9
. One end of the trench
93
is connected to be near the knife
92
, while another end is connected to a tube
94
extending from the base
9
. The tube
94
is utilized to be connected with a soft tube
95
of a dust absorber (not shown), so that as the knife
92
cuts a work piece, the dust can be absorbed by absorber and then flows through the trench
93
, tube
94
, and soft tube
95
to be absorbed to the absorber.
Referring to
FIG. 6
, a schematic cross sectional view of a prior art electric edge trimming machine is illustrated. Since the knife
92
protrudes from the bottom of the base
9
for trimming in cutting. The trench
93
is positioned to the base
9
. Therefore from the position for cutting a work piece by the knife
92
to the opening of the trench
93
are bent with 90 degrees and the trench
93
to the tube
94
are bent through 90 degrees to enter into the soft tube
95
of the dust absorber. Furthermore, the dust accumulator is installed at a farther place, and is connected to the tube
94
through a soft tube
95
, the absorbing force thereof is reduced at the bending portions in the flowing path. Therefore the effect of dust absorption is not preferred.
Moreover, the dust absorber must be bought additionally. It is not a fitting of the electric edge trimming machine, and thus, the cost is high.
The rotary speed of the motor
91
of an electric edge trimming machine is high. If the working piece is a large load and heat dissipation is bad in cutting, it is very possible that the rotor of the motor
91
will be burnt out or other parts have faults. Furthermore, the electric edge trimming machine has a high cost.
SUMMARY OF THE INVENTION
Accordingly, the primary object of the present invention is to provide a pneumatic edge trimming machine, wherein the periphery of the inner casing has via holes facing upwards. Since the place generating an absorbing force is relative near the work piece of the knife, the dust is strongly absorbed. The flow from the work piece of the knife to the tube through the inner casing and outer casing are smooth. Therefore the effect of absorbing dust automatically is high.
The various objects and advantages of the present invention will be more readily understood from the following detailed description when read in conjunction with the appended drawing.
REFERENCES:
patent: 4051880 (1977-10-01), Hestily
patent: 4245437 (1981-01-01), Marton
patent: 4422239 (1983-12-01), Maier et al.
patent: 4742855 (1988-05-01), Hartley
patent: 4957148 (1990-09-01), Shoda
patent: 5152327 (1992-10-01), Shoda
patent: 5370165 (1994-12-01), Stornetta
patent: 6146066 (2000-11-01), Yelton
patent: 11-58323 (1999-03-01), None
Cho Chung-Tsun
Lai Bao Shyan
Baxley Charles E.
Briggs William
Nailermate Enterprise Corp.
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