Abstract: A safety interlock system for a fire truck pump throttle control. The fire truck has a transfer box which is coupled through an automatic transmission to the engine. The transfer box is manually shiftable from a first mode in which it operatively connects the engine with the fire truck wheels, to a second mode in which it operatively connects the engine with the pump. The fire truck has a throttle control remote from the cab to vary the engine speed when the engine is driving the pump. The present invention provides a mechanism which senses the mode of the transfer box and locks the remote throttle control when the transfer box is in its first mode so that the engine speed is not inadvertently advanced from the position remote from the cab while the engine is coupled to the wheels of the truck.

Abstract: A ladder rack for van-type vehicles is disclosed. The ladder rack includes a frame which overlies the roof of the vehicle and includes a transverse member which supports a ladder placed on the frame. A hook member is provided for securing the ladder to the frame. One end of the hook member is pivotably attached to the transverse member near the center of the transverse member. An intermediate downwardly concave portion of the hook member extends outwardly with respect to the vehicle and projects over one of the rails of the ladder on the frame when the hook member is pivoted downwardly. The opposite free end of the hook member projects downwardly between the rails of the ladder when the hook member is pivoted downwardly. A lever is provided to pivot the hook member downwardly from an upwardly raised released position to a ladder holding position with the intermediate portion biased against the rail of the ladder, and the hook member is locked in the ladder holding position to secure the ladder to the rack.