Electricity: motive power systems – Phasing or angular or linear positional control of movable...
Patent
1989-05-01
1990-04-10
Ro, Bentsu
Electricity: motive power systems
Phasing or angular or linear positional control of movable...
318162, 318470, 340433, 116 28R, G08B 522
Patent
active
049163728
ABSTRACT:
Apparatus for activating a safety device hingedly mounted on a shool bus to swing it out to an outstretched position when the bus door is opened and to return the device to its retracted position when the bus door is closed. The system includes a control switch which is caused to close when the door is opened and to open when the door is closed. Associated with the control switch is a control circuit for connecting a DC power supply to a unidirectional DC motor operatively coupled through an eccentric drive and a link arm to the safety device whereby in the course of a single cycle of motor rotation, during one half of the cycle the device is caused to swing out to its fully outstretched position, and during the other half, the device is caused to return to its fully retracted position. The control circuit includes a commutator formed by a conductive rotor mounted on the motor shaft and first and second brushes which engage the rotor at diametrically-opposed positions, the rotor having an insulating element at its zero position to disconnect the brush engaging the element from the rotor.
REFERENCES:
patent: 2920309 (1960-01-01), Fultz
patent: 4339744 (1982-07-01), Latta
patent: 4559518 (1985-12-01), Latta
patent: 4697541 (1987-10-01), Wicker
patent: 4766413 (1988-08-01), Reavell
patent: 4816804 (1989-03-01), Reavell
Heath Raymond
Reavell James
Ebert Michael
Ro Bentsu
School Bus Parts Co. of Canada Inc.
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