Abstract: A part-time four-wheel drive vehicle has a transfer case and a split axle drive mechanism for the selectively driving two vehicle wheels. The split axle drive mechanism has a clutch associated with one of the differential side gears for preventing back drive to the transfer case in the two-wheel drive mode. A control system for operating the clutch responsive to the operational mode of the transfer case comprises a vacuum motor and a solenoid operated two-way valve energized by way of a switch in the transfer case. The control system also includes a pneumatic time delay and a vacuum check valve.
Abstract: An axle pin sized to fit in slidable supporting engagement within the wheel bearing of existing occupant actuated wheel chairs has a nut-like head and shoulder on one end that abuts the inner race of the bearing. An annular grove in the axle pin receives a snap ring abutting the opposite end of the bearing. The portion of the pin beyond the groove is sized to fit in close slidable relation within the axle receiving bore formed in an existing chair. The pin has a shoulder connected to an integral axially projecting end extending beyond the frame. A body member defines a bore receiving the projecting end of the pin. The body member has an integral externally threaded neck fitting around the pin and threads into the existing frame and abuts the shoulder on the pin. The body member defines an internally threaded transverse bore which intersects the pin receiving bore.