Abstract: The arrangement, in a first embodiment, comprises a cantilevered beam which is journalled at one end of a fixed shaft and journals another shaft on the opposite end. The fixed shaft, secured to the base of a machine, has a first sprocket integral therewith, the other shaft has a second sprocket integral therewith, and an endless chain is looped about and engaged with both sprockets. Also, the other, journalled, shaft carries a seat mount to which an operator's seat is joined. The arrangement accommodates for (a) a sluing of the seat, and (b) positioning of the seat in lateral dispositions in a same attitude, or orientation relative to the machine.

Abstract: The subassembly comprises a shaft having an eccentrically-weighted portion journalled in a tube which also has an eccentrically-weighted portion. The tube has an abutment therein which prevents full rotation of the tube relative to the shaft. With rotation of the tube in one direction, its abutment, at one side, comes into engagement with the eccentrically-weighted portion of the shaft and, consequently, both portions are in proximity and radially aligned to produce a maximum, oscillatory vibration. Tube rotation in the opposite direction causes the shaft portion to engage the other side of the abutment and, consequently, the portions are in opposite, radial dispositions, and produce a minimum, oscillatory vibration.

Abstract: The invention comprises a crank-linkage arrangement for a hydraulic servo valve, used on a road planer, to give the valve more sensitivity. It has a valve-operating crank coupled to a leverage-type linkage. The linkage responds to movements of a ground-engaging ski, which tracks the road surface, by displacing a same degree as does the ski, but by effecting a greater displacement of the crank. Limit stops on either sides of a limb of the linkage prevent any damaging overtravel of the crank.