Abstract: In a power-associated hand carrier including a body frame on which a wheel and a motor for driving the wheel are mounted, a manually operated forward drive control member for enabling the motor to produce power assist for moving the hand carrier in the forward direction and a manually operated reverse drive control member for enabling the motor to produce power for driving the hand carrier in the backward direction are both provided on the distal end portion of one of two handlebars extending from a rear portion of the body frame obliquely upward in a rearward direction of the hand carrier. The hand carrier having such forward and reverse drive control members is easy to handle and can exhibit good mobility when used in a relatively narrow working area or when moving over rough or angulated ground surfaces.

Abstract: In a clutch mechanism, a disc-shaped friction plate is disposed in a housing and an oil seal is interposed between an inner circumferential surface of the housing and the outer circumferential surface of the friction plate. The oil seal applies an inward radial force to the friction plate which, when the friction plate starts to rotate, gives rise to a circumferential frictional force tending to prevent the friction plate and a plurality of clutch pins fitted in pin-holding grooves formed in an inner circumferential surface of the friction plate from moving. Consequently, a stable frictional force is obtained between the housing side and the friction plate. Because the force providing the friction acts in the radial direction of the friction plate, no spring for providing an axial thrust is required and the length direction dimension of the driving member can be made small and the clutch mechanism can be made compact.

Abstract: A motor-assisted single-wheel cart is provided with a motor for generating an assisting power in response to an operation force when operating an operation handle by a human hand, and a power transmission mechanism for transmitting an output of the motor to an axle. The motor is arranged rearwardly upwardly of the axle so as to be positioned within a space surrounded by an upper horizontal member and a lower member positioned below the upper horizontal member constituting a vehicle body frame constituting the cart as viewing the vehicle body frame from a side surface thereof. The power transmission mechanism has a first speed reduction mechanism arranged near the motor, a second speed reduction mechanism arranged near the wheel and a transmission shaft for connecting them. The transmission shaft is inserted to the first and second speed reduction mechanisms so as to be capable of being drawn out.

Abstract: A speed change operation device for a vehicle with continuously variable transmission having a running apparatus, a power source and a continuously variable transmission for transmitting power from the power source to the running apparatus. The speed change operation device comprises a first movable member operated by a speed change operation member to rotate; a second movable member connected to a speed change operation quantity input section of the continuously variable transmission directly or indirectly through a transmission means to change speed of the continuous variable transmission; a first rotation support shaft pivotally supporting the first movable member; and a second rotation support shaft disposed in parallel with the first rotation shaft for pivotally supporting the second movable member.