Electrical implement with variable speed control

Details Electrical implement with variable speed control Electrical implement with variable speed control

1994-05-26

1995-10-03

Shoop, Jr., William M.

Electricity: motor control systems

Open loop speed control system for dc motor with commutator

Analog armature control

388827, 388937, H02P 7288

Patent

active

054558867

ABSTRACT:
An electrical implement having a bypass mechanism for controlling a variable speed motor is disclosed. The implement includes a tool, a variable speed electrical motor activatable for driving the tool, a housing supporting the motor and tool, and a control knob for controlling the speed of the motor. The control mechanism includes an on/off switch and a variable speed control circuit. The variable speed control circuit includes a variable resistance rheostat and bypass switch. The control knob controls whether the bypass switch causes current to bypass the rheostat to operate the motor at a predetermined speed or else whether the resistance in the rheostat is variable to change the speed of the motor. The control mechanism includes a cantilevered beam engageable by the control knob to operate the bypass switch. The cantilevered beam is sufficiently flexible to allow for large deflections while placing only limited force across the bypass switch.

REFERENCES:
patent: 3327196 (1967-06-01), Sahrbacker
patent: 3456230 (1969-07-01), Matthews et al.
patent: 3539748 (1970-11-01), Neumeier
patent: 3543120 (1970-11-01), Robertson
patent: 3590194 (1971-06-01), Frenzel et al.
patent: 3736391 (1973-05-01), Caviar
patent: 3825703 (1974-07-01), Berthier
patent: 3825704 (1974-07-01), Brauer
patent: 4057752 (1977-11-01), Artrip et al.
patent: 4236103 (1980-11-01), Matthey et al.
patent: 4296363 (1981-10-01), Blake et al.
patent: 4406982 (1983-09-01), McClellan, Jr.
patent: 4408244 (1983-10-01), Weible
patent: 4421251 (1983-12-01), Namadari et al.
patent: 4992709 (1991-02-01), Griffin
patent: 5003769 (1991-04-01), Cantwell
patent: 5043544 (1991-08-01), Daniels
patent: 5043545 (1991-08-01), Yamashita et al.

Affiliated with

Also associated with

Rating

Electrical implement with variable speed control does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Electrical implement with variable speed control, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Electrical implement with variable speed control will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-1082450