Truck level sensing and indicating system

Claim 1

A level sensing system for trailer dump trucks with a sensor-data transmitter positioned in a truck where it is to monitor the transverse level condition of the truck generally on the trailer frame in the area of the trailer rear wheels comprising: a sensor-data transmitter mountable on a truck; a data receiver and display unit usually positioned in the cab of a truck; a plumb vane included in said sensor-data transmitter; pitch axis mount means for said plumb vane; roll axis mount means for said plumb vane; a frame mounting said plumb vane and said roll axis mount means; dual cross members at the lower portion of said frame one in front of said plumb vane and one behind said plumb vane; said frame mounting a plurality of light emanating devices on one of said dual cross members of said frame; said frame also mounting a plurality of light sensitive activation devices subject to activation and deactivation by the amount of light impinging thereon; said pluarality of light emanating devices and said plurality of light sensitive activation devices positioned such that light paths between matched pairs of said devices are subject to intrusion interruption by said plumb vane when said sensor-data transmitter experiences predetermined amounts of roll from the transverse level state consistent with the transverse level condition of the trailer truck wheel set the said sensor-data transmitter is mounted near; signal transmission means interconnecting said sensor-data transmitter and said data receiver and display unit; and indicator means with said data receiver and display unit activated to indicate a roll state of the wheel set and the sensor-data transmitter when predetermined left or right roll angles are exceeded; wherein said plurality of light emanating devices are light emitting diodes; said plurality of light sensitive activation devices are phototransistors; said sensor-data transmitter is a digital data transmitter; said data receiver is a digital signal processing data receiver; said signal transmission means is a system with a common potential reference line, a DC voltage level line, and digital signal line means; there is a left hand set and a right hand set of light emitting diode and phototransistor combinations positioned to the right and left relative to said plumb vane and so sensitivity set as to trigger off with roll to a respective left or right side beyond a predetermined set degree of roll; and wherein said data receiver and display unit includes at least two lights as indicator means indicating a roll state of the wheel set and the sensor-data transmitter by one of the lights coming on when predetermined left or right roll angles are exceeded.