Electricity: motor control systems – Open loop speed control system for dc motor with commutator – Analog armature control
Patent
1988-10-14
1990-02-20
Shoop, Jr., William M.
Electricity: motor control systems
Open loop speed control system for dc motor with commutator
Analog armature control
388833, 388937, 318295, 200 1V, 200 5R, H02P 504
Patent
active
049033182
ABSTRACT:
An electric switch system for a DC motor powered power tool, comprising: a moveable block which is adapted to be manually displaced between a first position and a second position for speed control of the motor; a fixed block arranged adjacent to the first moveable block; a manual selection lever pivotally attached to the fixed block and adapted to be manually rotated from a neutral middle position to either side for the selection of the rotational direction of the motor; a cam structure for permitting the manual rotation of the manual selection lever in either direction away from the middle neutral position only when the moveable block is at the first position and keeping the angularly displaced state of the manual selection lever when the moveable block is displaced away from the first position. Thus, the selection of the rotational direction of the motor and the speed control of the motor can be accomplished as a continuous single operation, and the convenience of the power tool is improved. Further, since the composite control functions can be incorporated into a highly simplified integral unit, the manufacturing cost is reduced and the reliability of the system is improved.
REFERENCES:
patent: 3926264 (1975-12-01), Bardwell
patent: 4097703 (1978-06-01), Houser
patent: 4179644 (1979-12-01), Vassos
patent: 4353422 (1982-10-01), Bennett
patent: 4412158 (1983-10-01), Jefferson
patent: 4459522 (1983-01-01), Huber
patent: 4572997 (1986-02-01), Yamanobe et al.
patent: 4719395 (1988-01-01), Aoi
Martin David
Omron Tateisi Electronics Co.
Shoop Jr. William M.
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