Communications: electrical – Land vehicle alarms or indicators – For school bus
Patent
1988-02-16
1989-03-28
Crosland, Donnie L.
Communications: electrical
Land vehicle alarms or indicators
For school bus
340487, 318282, 180281, 180289, 246125, 116 28R, G08B 522
Patent
active
048168041
ABSTRACT:
The apparatus is provided with a unidirectional motor operatively coupled to the hinged sign through an eccentric drive by a link arm which incorporates a pre-loaded helical compression spring to prevent damage to the link arm should an attempt be made to forcibly swing the sign. Two normally-closed limit switches are associated with the link arm whereby in the course of a motor operating cycle, the stop sign is caused by the link arm to swing out to its outstretched position, at which point one limit switch opens, and then to return to its retracted position, at which point the other limit switch opens. The limit switches are included in a control circuit which supplies power to the motor. The control circuit is responsive to a door switch associated with the bus door so that when the door is open, the door switch is then closed, and power is supplied to the motor through one limit switch until the sign reaches its outstretched position, at which point this limit switch is opened to cut off the motor. When the door is closed and the door switch is then open, power is supplied to the motor through the other limit switch until the sign reaches its retracted position, at which point the motor is then cut off. Thus the operation of the sign is coordinated with that of the bus door to provide a stop signal when the need therefor arises.
REFERENCES:
patent: 2155617 (1939-04-01), Roan et al.
patent: 2243472 (1941-05-01), Roan et al.
patent: 3153398 (1964-10-01), Runkle et al.
patent: 4559518 (1985-12-01), Latta, Jr.
Crosland Donnie L.
Ebert Michael
School Bus Parts Co. of Canada Inc.
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