Drilling machine with pneumatic control
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United States of America Patent
Stats
-
Sep 18, 2007
Grant Date -
Aug 17, 2006
app pub date -
Apr 14, 2006
filing date -
Sep 26, 2004
priority date (Note) -
In Force
status (Latency Note)
Importance
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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