Tool driving or impacting – Means to drive tool about an axis – Gear drive
Reexamination Certificate
2007-09-18
2007-09-18
Truong, Thanh (Department: 3721)
Tool driving or impacting
Means to drive tool about an axis
Gear drive
C173S019000, C173S047000, C173S145000, C408S009000, C408S014000, C408S017000, C408S138000
Reexamination Certificate
active
11404298
ABSTRACT:
A pneumatic drilling machine is provided, comprising a pneumatic motor, a circuit for connecting the motor to a source of compressed air, a tool holder spindle, and a drive mechanism. The drive mechanism comprises a coupling shaft which can be moved to select a first mode of driving the spindle and a second method of driving the spindle. The mechanism has a driving cycle which comprises a stationary mode at the beginning and end of the cycle, and at least one phase for driving the spindle according to the first driving method, then a phase for driving the spindle according to the second driving method, then the stopping of the supply of air to the motor. A supply valve of the circuit is controlled pneumatically by the drive mechanism to interrupt the supply of compressed air to the motor at the end of the driving cycle.
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Fulwider Patton LLP
P.V. Tools, Inc.
Truong Thanh
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