A handle folding mechanism, a three-fold handle employing the folding mechanism, and a stroller having the same are provided. The folding mechanism includes an intermediate component and a pair of connecting components. The intermediate component includes a tubular casing, a press block, and an unlocking piece. A rear part of the press block passes through a front surface of the casing to extend into the casing, and is movable back and forth. The connecting component includes a tubular housing and an engaging piece. The engaging piece is slidably mounted in the housing. In a locked state, a front end of the engaging piece penetrates into the casing. The unlocking piece has a fixing part, and the fixing part is disposed with a free end extending between a rear end of the press block and the front end of the engaging piece.

A handle folding mechanism, a three-fold handle employing the folding mechanism, and a stroller having the same are provided. The folding mechanism includes an intermediate component and a pair of connecting components. The intermediate component includes a tubular casing, a press block, and an unlocking piece. A rear part of the press block passes through a front surface of the casing to extend into the casing, and is movable back and forth. The connecting component includes a tubular housing and an engaging piece. The engaging piece is slidably mounted in the housing. In a locked state, a front end of the engaging piece penetrates into the casing. The unlocking piece has a fixing part, and the fixing part is disposed with a free end extending between a rear end of the press block and the front end of the engaging piece.

A cross-over stroller kit is provided. The kit has a main frame assembly to receive at least one child seat assembly. The main frame assembly has a rear wheelbase and an upper attachment feature adapted to receive a lower attachment feature provided on first and second front-end frame assemblies. The first front-end frame assembly has two front wheels and the lower attachment feature adapted to mate with the upper attachment feature to define a city-mode stroller having four wheels. The second front-end frame assembly has a single front wheel and a second lower attachment feature adapted to mate with the upper attachment feature to define a sport-mode stroller having three wheels.

A wheeled platform has a base, a plurality of wheels, and a power supply. A connector extends from the wheeled platform. A motor assembly has at least one motor mounted on the connector to couple with a stroller. A controller assembly steers the stroller. The base includes an upper surface for supporting an operator. The base forms a wheel assembly for holding the wheels. The power supply sends power to the motor assembly through the control assembly to drive the stroller.

A rolling car seat assembly includes a seat base that is positionable on a vehicle seat. The seat base has a plurality of wheel wells therein. A car seat is provided that has a child seated therein. The car seat is positionable in a seated position or a rolling position. A plurality of rollers is each rotatably coupled to the car seat. Each of the rollers is positioned in a respective one of the wheel wells in the seat base when the car seat is positioned in the seated position. Each of the rollers rolls along a support surface when the car seat is positioned in the rolling position to transport the child without requiring the child to be carried. A handle is slidably coupled to the car seat for gripping to roll the car seat.

A rolling car seat assembly includes a seat base that is positionable on a vehicle seat. The seat base has a plurality of wheel wells therein. A car seat is provided that has a child seated therein. The car seat is positionable in a seated position or a rolling position. A plurality of rollers is each rotatably coupled to the car seat. Each of the rollers is positioned in a respective one of the wheel wells in the seat base when the car seat is positioned in the seated position. Each of the rollers rolls along a support surface when the car seat is positioned in the rolling position to transport the child without requiring the child to be carried. A handle is slidably coupled to the car seat for gripping to roll the car seat.

A rolling car seat assembly includes a seat base that is positionable on a vehicle seat. The seat base has a plurality of wheel wells therein. A car seat is provided that has a child seated therein. The car seat is positionable in a seated position or a rolling position. A plurality of rollers is each rotatably coupled to the car seat. Each of the rollers is positioned in a respective one of the wheel wells in the seat base when the car seat is positioned in the seated position. Each of the rollers rolls along a support surface when the car seat is positioned in the rolling position to transport the child without requiring the child to be carried. A handle is slidably coupled to the car seat for gripping to roll the car seat.

A rolling car seat assembly includes a seat base that is positionable on a vehicle seat. The seat base has a plurality of wheel wells therein. A car seat is provided that has a child seated therein. The car seat is positionable in a seated position or a rolling position. A plurality of rollers is each rotatably coupled to the car seat. Each of the rollers is positioned in a respective one of the wheel wells in the seat base when the car seat is positioned in the seated position. Each of the rollers rolls along a support surface when the car seat is positioned in the rolling position to transport the child without requiring the child to be carried. A handle is slidably coupled to the car seat for gripping to roll the car seat.

A ridable kart can have a body that supports a front wheel and movable rear wheels. The kart can include a motor that supports and drives the rear wheels. The motor and rear wheels are configured to tilt and rotate relative to the body of the kart. The body of the kart includes a concave space in which the front and rear wheels are positioned so that they are at least partially concealed by the body when viewed from the side of the kart.

A ridable kart can have a body that supports a front wheel and movable rear wheels. The kart can include a motor that supports and drives the rear wheels. The motor and rear wheels are configured to tilt and rotate relative to the body of the kart. The body of the kart includes a concave space in which the front and rear wheels are positioned so that they are at least partially concealed by the body when viewed from the side of the kart.