| 摘要 |
A compact sweeping machine is provided which has steerable front wheels of variable track. This allows the machine to be used with a minimum track dimension for sweeping but with a maximum track dimension for travel to and from the workplace. The front wheels are steerable and independently driven by means of hydraulic motors and are each supported on extendable parts of a telescopic axle beam which is supported on trailing arms supported by ball joints from the chassis of the machine. The extendable parts are extended and retracted by track change cylinders and steering is by means of a hydraulic cylinder extending between the axle beam and a bell crank lever for one of the wheels, one of the arms of which provides a steering arm for that wheel. This steering arm is connected by a forwardly drag link to a bell crank forming part of a steering relay mechanism which is connected by a cross link to a second bell crank lever, one arm of which is connected to a rearwardly extending drag link to a steering arm of the other wheel. The two bell crank levers of the steering relay mechanism are interconnected by a cross link.
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