Abstract: An integrated jackknife control device for a tractor trailer assembly requires minimal if any modification to the existing fifth wheel coupler of the tractor trailer. The device comprises a computer controlled braking system including one or more pivot brakes acting directly on the trailer body, sensors which detect tractor trailer conditions indicative of incipient or full-fledged jackknifing and possibly other hazardous conditions such as collision or panic braking, and a proportional controller which causes one or more brake to apply a resistive force directly to the trailer which increases proportionally with a sensed degree of trailer jackknifing. The braking system preferably will automatically remain in a standby mode during backing maneuvers and will allow the operator to actuate the braking system manually and also to reset or return the braking system to a standby condition.

Abstract: The present invention comprises a wheelchair for the physically or mentally handicapped wherein cross brace structure extending between the sides of the wheelchair is provided below the seat adjacent the front thereof and additional cross brace structure is provided extending between the sides of the chair across the back above seat level so that said chair structure can be backed over a water closet and further wherein said seat includes a plurality of sections one of which can be withdrawn from beneath a user without loss of body support enabling a handicapped user to eliminate body wastes without assistance or embarrassment.