Abstract: A rotating sign assembly has a plurality of rotatable, multi-sided, sign segments and a drive mechanism for rotatably driving the sign segments. The drive mechanism includes a drive shaft and one or more output shafts that each operate to rotate a multi-sided sign segment. A cam is fitted to each of the output shafts so that rotation of the cam causes rotation of the corresponding output shaft and sign segment. The cam has an outer perimeter and multiple equally spaced engagement slots which extend radially inwardly from the outer perimeter. Outwardly facing stabilizing portions are positioned between each of the engagement slots. The cam has multiple dwell positions, each corresponding to the display of one side of the multi-sided sign segment operated by the corresponding output shaft. A cam driver assembly is fitted to the drive shaft so that it rotates with the drive shaft. The cam driver assembly has a cam driver which extends outwardly from the axis of rotation and terminates in a knob.

Abstract: A rotating sign assembly has a plurality of rotatable, multi-sided, sign segments, a torque transmitting member which is rotatable about a first axis of rotation, a mechanism for rotatably driving the torque transmitting member, and a torque limiter. The torque limiter includes a pair of engagement members, one of which is fitted on the torque transmitting member so that it rotates with the torque transmitting member about the first axis of rotation. This first engagement member has a first engagement surface. The second engagement member operates to rotate one of the multi-sided sign segments and is supported for rotation about the first axis of rotation. This engagement member has a second engagement surface which is configured to abut the first engagement surface on the first engagement member. The torque limiter also includes a coupling which includes a projection on one of the engagement surfaces and a recess defined in the other engagement surface.

Abstract: A rotating sign assembly includes a number of multi-sided, rotatable sign segments driven by an elongated drive shaft operably interconnected with each of the sign segments. The drive shaft includes at least one multi-armed driven cam fitted to the drive shaft. Each arm of the driven cam includes an outer sloped driving surface and a peaked extremity. The driven cam is rotatably driven by a driving arm assembly comprising a driving pin plate and a driven arm stop plate. The driving pin plate includes a pair of pins, one situated on each end of the plate. Each driving pin alternatingly interacts with the outer sloped surfaces of the cam for rotation thereof, this rotation being halted by interaction of the peaked extremities alternatingly with the ends of the stop plate.

Abstract: A speed motor control circuit for an electric motor of the type which drives a louvered sign assembly between predetermined rotational positions. The speed control includes a silicon controlled rectifier which is connected in series between the motor and the power supply. A unijunction transistor has one of its bases connected to the gate of the silicon controlled rectifier to switch on, or activate, the silicon controlled rectifier whenever the unijunction transistor becomes conductive. A variable resistor controls the bias to the emitter for the unijunction transistor in order to vary the time period or duty cycle that the unijunction transistor conducts and thus the time period or duty cycle that the silicon controlled rectifier is in its conductive state. A switch assembly and timing module are also employed to activate the motor at predetermined time intervals and for a predetermined angular rotation of the motor shaft.