Battery-operated grease gun with an electronic pressure regulator for controlling pressure of the grease
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United States of America Patent
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-
Apr 25, 2006
Grant Date -
Nov 25, 2004
app pub date -
May 22, 2003
filing date -
May 22, 2003
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A battery operated grease gun has a motor that drives a planetary gear assembly that is coupled to a pump assembly that drives a plunger reciprocally in an grease passage to discharge grease through a discharge spout. The pressure in the grease exerts a reaction force on the plunger that will change torque of the motor. The change of the torque of the motor will simultaneously effect voltage applied to the motor. When the voltage in the motor changes, an electronic pressure regulator measures the voltage in the motor to determine the pressure in the grease in the grease passage and stops the motor as the pressure in the grease reaches preset given valves in the pressure regulating device.
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