Abstract: A compact, lightweight riding trowel for finishing concrete of enhanced maneuverability. A rigid frame is supported above the concrete by a pair of downwardly projecting synchronized rotors, each of which revolves multiple blades frictionally contacting the surface. Lights attached to frame corners provide illumination. The operator manually steers with a pair of primary control levers which tilt the rotors to generate steering forces. The pitch of each rotor blade is controlled manually or electrically, and a cable-driven clutch fork system is activated to vary pitch between minimum and maximum. Each of the tiltable rotor assemblies is driven by gear boxes coupled to the motor through a flexible disk drive shaft. Each gear box is mounted to the frame underside by a pivot steering box. Parallel lever arms extending beneath the frame in a direction generally perpendicular to the biaxial plane defined by the rotors are deflected by the primary control levers.

Abstract: A tether switch is connected to both the operator presence system and the automatic lubrication distribution system on a harvester such as a cotton picker. A lubrication control switch on the instrument panel of the harvester is connected to the tether switch and to the lubrication control and is switchable to a first condition wherein depression of the tether switch activates driven components on the harvester and the lubrication system to cause lubrication to be pumped to the moving components. The tether switch may be moved between harvester cab and harvester unit locations so that, when the control switch is in the first condition, the operator can cause the units to be lubricated while he watches the driven components from a location remote from the cab.