Cutting by use of rotating axially moving tool – With control means energized in response to activator... – To control tool rotation
Patent
1994-12-27
1996-12-17
Rachuba, M.
Cutting by use of rotating axially moving tool
With control means energized in response to activator...
To control tool rotation
408 16R:, B23B 4724
Patent
active
055846190
ABSTRACT:
A method of and an arrangement for preventing accidents during operation of a manually-operated machine tool having a rotatable toolbit and a drive motor for driving the toolbit, wherein an operational condition of the toolbit is determined with a rotational motion sensor, a time constant is selected, a maximum forecast rotational angle at an end of a time period determined by the selected time constant is calculated on a basis of a rotational motion signal generated by the sensor, and transmission of drive motion from the drive motor to the rotatable toolbit is interrupted as soon as the calculated, forecasted rotational angle exceeds a value of the maximum allowable rotational angle.
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Hilti Aktiengesellschaft
Rachuba M.
Tsai Henry W. H.
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