The disclosure concerns a motor vehicle with a mobile vehicle seat. The seat includes a frame that forms a seating surface and a backrest. An energy source is arranged in the frame. A drive motor is arranged in the frame and connected to the energy source. At least one wheel is arranged on the frame and in drive connection with the drive motor. A control device controls the drive motor, and a first coupling is arranged on the frame to releasably fix the frame to the motor vehicle. A second coupling corresponding to the first coupling of the vehicle seat is arranged on an inside of a vehicle door, which is mounted pivotably on a vehicle superstructure. The second coupling can be brought into releasable engagement with the first coupling of the vehicle seat.

A dual purpose cycle includes a frame unit, a wheel unit, a hub unit, and two crank arm units. The wheel unit includes a front wheel rotatably mounted to the frame unit. The hub unit surrounds an axis, extends though the front wheel, and includes opposite mounting portions respectively disposed at two opposite sides of the front wheel. Each of the mounting portions has an end surface facing oppositely of the front wheel, and an engaging groove indented from the end surface along the axis and having a non-circular cross-section. Each of the crank arm units includes an engaging member having a non-circular cross section, and removably and engagingly inserted into the engaging groove of a respective one of the mounting portions.

A dual purpose cycle includes a frame unit, a wheel unit, a hub unit, and two crank arm units. The wheel unit includes a front wheel rotatably mounted to the frame unit. The hub unit surrounds an axis, extends though the front wheel, and includes opposite mounting portions respectively disposed at two opposite sides of the front wheel. Each of the mounting portions has an end surface facing oppositely of the front wheel, and an engaging groove indented from the end surface along the axis and having a non-circular cross-section. Each of the crank arm units includes an engaging member having a non-circular cross section, and removably and engagingly inserted into the engaging groove of a respective one of the mounting portions.

Quick-release skis couple to the front wheels of an ATV or other wheeled vehicle, to permit the ATV to travel over snow. The rear ATV wheels may be left unaltered, or more commonly, tracks may be substituted for the rear wheels. The ski coupling includes a drive-on runner and coupling having in one embodiment width-adjustable side walls, an over-center clamp, and a lock for securing the over-center clamp. In a second embodiment, a pivotal tire cage allows the ATV tire to be driven onto the ski, but simply by forward travel of the tire the cage pivots to constrain the tire thereon. A strap then binds the tire and cage to ensure the tire stays in place on the ski. In a third embodiment, an ATV track is converted to a runner by the application and tensioning of a ski. Additional embodiments are illustrated.

Quick-release skis couple to the front wheels of an ATV or other wheeled vehicle, to permit the ATV to travel over snow. The rear ATV wheels may be left unaltered, or more commonly, tracks may be substituted for the rear wheels. The ski coupling includes a drive-on runner and coupling having in one embodiment width-adjustable side walls, an over-center clamp, and a lock for securing the over-center clamp. In a second embodiment, a pivotal tire cage allows the ATV tire to be driven onto the ski, but simply by forward travel of the tire the cage pivots to constrain the tire thereon. A strap then binds the tire and cage to ensure the tire stays in place on the ski. In a third embodiment, an ATV track is converted to a runner by the application and tensioning of a ski. Additional embodiments are illustrated.

Embodiments include strollers having removable seats. An example stroller may include rear wheels, front wheels, and a frame including a handle portion, a rear wheel support portion, a front wheel support portion and a folding mechanism connecting the front wheel support portion and the handle portion in both an unfolded configuration and in a folded configuration. The frame may include a stroller seat support portion positioned at a first vertical position adjacent the handle portion, and a front seat attachment configured for attachment to the front wheel support portion at a second vertical position substantially lower than the first vertical position. The front seat attachment may be configured to support the front stroller seat substantially over the front wheels so that a center of gravity of the stroller system is between the front wheels and the rear wheels.

A tricycle operable in a swivel state and a steering state, having a tricycle frame; two rear wheels rotatably connected to the tricycle frame; a front wheel; a handlebar; a wheel fork rotatably connected on one end thereof to the front wheel and connected on a second end thereof to the handlebar via a swivel mechanism; the swivel mechanism comprises: a push button configured to: be pushed down and towards the tricycle frame thereby coupling the handlebar to the wheel fork and allowing a rider of the tricycle to steer; and be pushed down and away from the tricycle frame thereby detaching the handlebar from the wheel fork and allowing the front wheel to swivel; wherein the front wheel swivel rotation axis is different than the handlebar rotation axis.

A folding tricycle, having a first rear frame rotatably connected on a first end thereof with a first end of a first bottom frame; a second rear frame rotatably connected on a first end thereof with a first end of a second bottom frame; the first rear frame rotatably connected on a second end thereof with a first rear wheel; the second rear frame rotatably connected on a second end thereof with a second rear wheel; the first and second bottom frames rotatably connected on second ends thereof with a first end of a front frame; a seat frame rotatably connected on a front end thereof with one of a second end of the front frame and a front bearing member; a front wheel connected with a handlebar through one of the front frame and the front bearing member; first and second support frames connected respectively on first end thereof with the first and second rear frames and configured to stabilize the tricycle in an unfolded position; and a locking mechanism configured to lock the tricycle in an unfolded position; the tricycle is configured to be folded into a position where the front wheel is positioned in between the first and second rear wheels.

A balance bike conversion system may include first and second protective inserts, each having an interface adapted to engage opposite ends of a bicycle bottom bracket. A connector may be adapted to connect the first and second protective inserts, and may be adapted to adjust the distance between the inserts, thereby accommodating variability in the width of the bottom bracket. The system may further include adapters to enable the system to be used with bicycles having bottom brackets with different diameters, and may use an elastomeric gasket to accommodate larger bottom brackets. The protective inserts and/or adapters may provide mechanical support to the bottom bracket, thereby protecting it from damage.

Foldable electrical vehicles and related charging infrastructure are described. The foldable electrical vehicle generally includes three structural members (front and rear wheel-bearing structural members and a seat-bearing structural member) that are pivotally interconnected along their lengths such that they may be pivoted between a closed position wherein the three structural members are disposed roughly parallel to each other in a compact folded configuration, and an open riding configuration wherein an angular relation is formed between the structural members.