![]() The vehicle of claim 16 wherein the connection between the yaw housing and the tongue includes a pin to prevent rolling motion of the trailer unit relative to the power unit.ġ9. The vehicle of claim 16 wherein the yaw housing includes a tail shaft operable to be connected to the tongue in a selected working position.ġ8. The vehicle of claim 15 wherein the yaw housing is connected to a tongue of the trailer unit.ġ7. The vehicle of claim 8 wherein the yaw axle is operably connected to a yaw housing connected to the trailer unit.ġ6. The vehicle of claim 8 wherein the power unit is supported on a single wheel.ġ5. The vehicle of claim 8 wherein the power source is connected to the drive wheel through a flexible power-transmission element.ġ4. The vehicle of claim 8 wherein at least one of the two axes is substantially horizontal.ġ3. The vehicle of claim 8 wherein at least one of the two axes is a substantially vertical yaw axis.ġ2. The vehicle of claim 8 wherein the power source is an electric motor.ġ1. ![]() The vehicle of claim 8 wherein the power source is an internal combustion engine.ġ0. A vehicle comprising: a power unit having a front portion, a rear portion, a power source, a drive wheel, disposed in the front portion of the power unit and connected to the power source, and a handle bar extending back from the power unit a trailer unit, having two or more trailer wheels, disposed behind the power unit and a pitch/yaw joint to allow pitch and yaw motion of the power unit with respect to the trailer unit comprising spaced-apart members mounted on the power unit, and a member defining a yaw axle and a pitch axle, the pitch axle being operably connected to the spaced-apart members mounted on the power unit and allowing the power unit and trailer unit to move with respect to one another about two axes.ĩ. The vehicle of claim 1, wherein the ground-engaging brake pad is rigidly attached to an anterior portion of the power unit.Ĩ. The vehicle of claim 1 wherein the power source is connected to the drive wheel through a flexible power-transmission element.ħ. The vehicle of claim 1 wherein the at least one axis is substantially horizontal.Ħ. The vehicle of claim 1 wherein the at least one axis is a substantially vertical yaw axis.ĥ. The vehicle of claim 1 wherein the power source is an electric motor.Ĥ. The vehicle of claim 1 wherein the power source is an internal combustion engine.ģ. A vehicle comprising: a power unit having a drive wheel connected to a power source and a ground-engaging brake pad connected to the power unit beneath the power source and behind the drive wheel a trailer unit having at least one trailer wheel and a connecting joint, connecting the power unit to the trailer unit, allowing the power unit and trailer unit to move with respect to one another about at least one axis to allow the ground-engaging brake pad to engage the ground and be lifted off of the ground.Ģ. ![]() Power propelled hand truck and control unit thereforġ. Surface roller and motor platform mounting thereon Hand cart adapted for use with interchangeable load carriersĬombined steering and braking means for child's vehicle Scooter type vehicle with combination fender and brake therefor Luggage carrier for a three-wheel motorcycle Suspension and drive arrangement for three wheel vehicleĭetachable steerable power unit for occupant-propelled wheelchairs Motorizing device for a trailer drawn by a tractor Steerable device for moving trailer type vehicles Self-propelled balancing three-wheeled vehicle Rear drive ride-on tractor unit for propelling steerable utility vehicles such as walk-behind paint stripersįork lift and method for operating and transporting same Rear-drive, ride-on tractor propulsion unit for articulation with manually steerable utility vehicles
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