Communications: electrical – Digital comparator systems
Patent
1987-04-01
1988-08-23
Crosland, Donnie L.
Communications: electrical
Digital comparator systems
340133, 318282, 180281, 180289, 246125, 116 28R, G08B 522
Patent
active
047664134
ABSTRACT:
Control apparatus for a hinged stop sign mounted on the side of a school bus to cause the sign to swing out to an outstretched position when the bus door is opened to load or unload passengers and to return the sign to its retracted position when the door closes. The apparatus is provided with a unidirectional motor operatively coupled to the hinged sign through an eccentric drive by a link arm having associated therewith two normally-closed limit switches, whereby in the course of a motor operating cycle, the stop sign is caused to swing out to its outstretched position, at which point one limit switch opens, and then returns 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), Verne 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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