Abstract: An electric vehicle battery recharge-replacement system has four major parts: (1) a rechargeable battery pack consisting of a number of separate sub-packs with an identical dimension and energy capacity, (2) a same number of battery sub-pack compartments on an electric vehicle, and all sub-pack compartments having an identical dimension, (3) a recharging array consisting of a number of individual recharging compartments stacking together, and each recharging compartment having a dimension same as the vehicle sub-pack compartment, and (4) some battery sub-pack holding cases, each of which having an identical dimension. With this system, battery pack replacement can be realized by replacing drained battery sub-packs in an electric vehicle's compartments with recharged battery sub-packs in a recharging array's compartments. In this system, each battery sup-pack can further consist of two to four identical sub-sub-packs, which are even lighter and easier to handle.

Abstract: A sliding seat, being manufactured either together with a wheelchair as a component or separately as an accessory to a used wheelchair and aiming at helping a wheelchair occupant enter into or exit from a motor vehicle, comprises a supporting rack, a siding cushion, and an extender. The supporting rack has a top-board, a bottom frame, and a hoisting device in between. On the upward surface of the top-board, there are two crosswise sliding rulers. The sliding cushion has a soft cushion top and a solid baseboard which has two sliding sleeves on its downward surface to sheathe the sliding rulers of the top-board of the supporting rack. The extender also has two crosswise sliding rulers, which can connect with or disconnect from the sliding rulers of the top-board of the supporting rack. When being connected, the extender extends the two elongated sliding rulers into an open-door motor vehicle and lays them on the vehicle seat.

Abstract: A truck cargo bed extender-tailgate assembly has three extension boards that are hinged with the tailgate. When extra cargo volume is desired, the assembly is lowered to a horizontal position. The left and right extension sideboards fold up to upright positions and pinned respectively with the left sidewall and the right sidewall of the truck bed. The extension backboard folds up to an upright position and is pinned with the upright left extension sideboard and the upright right extension sideboard. With three extension boards at upright positions, the cargo bed is extended by an length equal to the height of the tailgate. The extension backboard can be lowered from its upright position backward to a horizontal position, further extending the cargo bed floor. When the extended cargo bed is no longer needed, three extension boards can be easily folded down to their stowed positions to resume the original vehicle length.