The invention provides a frame folding mechanism, a frame locking mechanism, a backrest unlocking mechanism and a stroller. A handle, a front foot, a seat portion and a linking member of the frame folding mechanism form a planar linkage mechanism. The handle and the front foot can be driven to rotate and fold toward a rear foot, so as to drive the seat portion to rotate and fold. The frame locking mechanism can drive a sliding member and a frame expansion locking member to slide by an unlock driving mechanism, such that the frame expansion locking member disengages from a handle locking hole and a front foot locking hole to unlock a frame. The backrest unlocking mechanism has a backrest locking member. The unlock driving mechanism can drive the backrest locking member to slide, such that the backrest locking member disengages from a backrest portion to unlock the backrest portion.

A convertible car seat, carrier and stroller device includes a car seat that has a frame, which is rigid. The car seat is shaped and sized to a child. A handle, which is extendable, is coupled to a back of the frame. A wheel assembly is coupled to and positioned in a housing that is coupled to a bottom of the frame. The wheel assembly is extensible from the housing and operationally coupled to the handle. Extending the handle lowers the wheel assembly and retracting the handle raises the wheel assembly. The car seat is couplable to a base that is configured to couple to an interior of a vehicle. The base is couplable to the interior of a vehicle and positioned to secure the car seat in the vehicle.

A folding device of a stroller includes a folding assembly which is configured to fold the stroller and a safety assembly. The folding assembly includes an operable pull handle. The pull handle is slidably sleeved over a handle frame of the stroller and is movable between a holding position and a release position. The safety assembly is configured to cooperate with the folding assembly, in which the safety assembly includes a locking member for preventing misoperation of the pull handle, and the locking member is switchable between a locked position and an unlocked position. The locking member is configured to prevent the pull handle from moving to the release position responsive to the locking member being in the locked position; and the locking member is entirely located inside the handle frame responsive to the locking member being in the unlocked position.

A multipurpose riding apparatus having a chair body pivotally attached to a chair base, a seat associated with the chair body, a pair of front wheels rotationally attached to the chair body, a back wheel rotationally attached to the chair base; a brake attached to the chair body and associated with the back wheel, such that selective actuation of the brake prevents the rotation of the back wheel; an orientation lock associated with the chair body and the chair base, wherein the orientation lock is configured to selectively prevent rotation of the chair body about the chair base. The multipurpose riding apparatus may be ridden and controlled by a standing user that is standing on the chair base, while simultaneously holding a sitting user within the seat. The multipurpose riding apparatus may be folded into a compact package while not in use, thus facilitating easy storage and transport.

A parking brake assembly includes a disc defining an aperture and a ramp located adjacent to the aperture; a pedal configured to rotate the disc in a locking direction or an unlocking direction; and an actuator including a body and a spring biased to push the body towards the aperture, the actuator further including a pin positioned and arranged to ride along the ramp when the disc is rotated relative to the actuator, wherein spring is allowed to push the body through the aperture and into a mating hole, of or associated with a wheel, when the disc is rotated in the locking direction such that the pin rides down the ramp, and wherein the spring is prevented from pushing the body through the aperture and into the mating hole when the disc is rotated in the unlocking direction such that the pin rides up the ramp.

An unlock device includes at least one operating member, a retaining mechanism and at least one unlock module. The at least one operating member is movably disposed on a frame, wherein the frame is equipped with at least one lock mechanism. The retaining mechanism is disposed on the at least one operating member. The at least one unlock module is movably disposed on the frame and connected to the at least one lock mechanism. When the at least one operating member moves to drive the at least one unlock module to move to unlock the at least one lock mechanism, the retaining mechanism retains the at least one operating member at an unlock position.

A parking brake assembly includes a disc defining an aperture and a ramp located adjacent to the aperture; a pedal configured to rotate the disc in a locking direction or an unlocking direction; and an actuator including a body and a spring biased to push the body towards the aperture, the actuator further including a pin positioned and arranged to ride along the ramp when the disc is rotated relative to the actuator, wherein spring is allowed to push the body through the aperture and into a mating hole, of or associated with a wheel, when the disc is rotated in the locking direction such that the pin rides down the ramp, and wherein the spring is prevented from pushing the body through the aperture and into the mating hole when the disc is rotated in the unlocking direction such that the pin rides up the ramp.