Cooper Industries, Inc.

Robert W Klemm

Clifford L Galloup

Roger M Bula

Ralph E Westerburg

A combination bit for cutting and stripping insulation from a solid flexible conductor wire and wrapping a stripped end portion of the wire on a terminal in a series of helical convolutions includes a cooperable sleeve having a wall portion forming a guide surface for permitting insertion of the wire into a groove formed on the periphery of the bit. A cutting blade disposed in the groove includes opposed straight cutting edge portions one of which is proportioned such that it engages the insulation of the conductor wire initially in a position which places said edge parallel to a cooperative flat surface portion on said sleeve and tangent to the circumference of the wire insulation. The bit and sleeve are proportioned so as to provide for initial engagement of the insulation by the conductor wire within approximately five degrees of angular rotation of the bit from its starting point.

Cutting, stripping and wrapping bit

A portable conductor wrapping tool having a rotary bit driven by an electric motor includes a motor control circuit in which a switch responsive to a magnetic field is disposed in proximity to a drive spindle for the bit and a magnet mounted on the tool housing. A magnetic flux shunt disposed on the spindle distorts the magnetic field of the magnet as the shunt passes through the field causing the switch to open to deenergize the motor and stop the bit and spindle in a predetermined position. The motor control circuit includes a solid state speed control device and a manually actuated switch which in a first position provides full power to the motor and in a second position supplies reduced power through the magnetic responsive switch.

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Hersey, MI, United States of America

Robert W Klemm