Hammer drill with hammer drive action coupling
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United States of America Patent
Stats
-
Jan 11, 1994
Grant Date -
N/A
app pub date -
Oct 29, 1991
filing date -
May 31, 1989
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A power tool has a tool spindle, a hammer unit, a drive including a motor having a motor driven shaft, a motion conversion gear for generating reciprocating piston movement, and a disengageable coupling located between the motor and the motion conversion gear and engaging the hammer unit. The coupling has two coupling parts which held apart, one of the coupling parts being axially fixed and another of the coupling parts being axially movable and arranged on the motor-driven shaft rotatable relative to the shaft. A gear linkage connects the another coupling part with the shaft and transmits portions of a torque of the shaft to the another coupling part in form of an axially directed closing force.
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