Cutting by use of rotating axially moving tool – With randomly-actuated stopping means – Responsive to condition of tool or tool-drive
Patent
1990-06-19
1991-04-16
Bishop, Steven C.
Cutting by use of rotating axially moving tool
With randomly-actuated stopping means
Responsive to condition of tool or tool-drive
408 11, 408 15, 408 16, 408 76, B23B 4514
Patent
active
050077767
ABSTRACT:
A controller for a magnetic base drill unit provided with a safety circuit which is constructed by connecting in series a relay provided with contacts for cutting the power supply to the drill motor and feed motor, a resistor and a diode. The relay is actuated when a voltage higher than the predetermined voltage to be applied to the feed motor in the hole cutting mode is applied to the feed motor during the hole cutting, thereby cutting the power supply to the drill and feed motors. The controller has a means for confirming the operation of the safety circuit which apply a test voltage higher than the maximum predetermined voltage to be applied during the hole cutting to the feed motor in the fall mode of the electric drill.
REFERENCES:
patent: 2977825 (1961-04-01), Buck
patent: 4559577 (1985-12-01), Shoji et al.
Bishop Steven C.
Nitto Kohki Co., Ltd
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