A folding hook structure for arranging a first object and a second object to be relatively rotatable between an extended state and a collapsed state, the folding hook structure comprising: a rotating disk having a folding hook groove disposed on a disk surface thereof, the folding hook groove including: a circumferential section extending in a circumferential direction of the rotating disk; and a radial section extending from the circumferential section along a radial direction of the rotating disk; a folding hook inserted in the folding hook groove and movable between a locked position and a released position along the radial direction; wherein the first object and the second object are in the extended state when the folding hook is in the circumferential section; and the first object and the second object are in the collapsed state when the folding hook is in the radial section.

A stroller includes: a body frame including a wheel; a handle frame; a first lock mechanism configured to switch one movable portion of the body frame between a locked state and an unlocked state; a second lock mechanism configured to switch another movable portion of the body frame between a locked state and an unlocked state; and an operation member provided in the handle frame and configured to selectively actuate one of the first and second lock mechanisms. The operation member is configured to be operated in a first direction and a second direction different from the first direction. The first lock mechanism is switched to a locked state or an unlocked state by operating the operation member in the first direction. The second lock mechanism is switched to a locked state or an unlocked state by operating the operation member in the second direction.

A stroller frame (100) includes a front leg (10), a bottom tube (30), a rear leg (20), an upper support member (40) and a lower support member (50). The front leg (10), the bottom tube (30), the lower support member (50) and the upper support member (40) are pivotally connected to each other to form a four-bar linkage structure. The rear leg (20) is connected to an end of the bottom tube (30). A lock mechanism (60) is disposed at a pivot joint between the upper support member (40) and the lower support member (50). The lock mechanism (60) is able to lock the upper support member (40) and the lower support member (50) at an expanded angle, such that the front leg (10) is able to be expanded with respect to the bottom tube (30). The lock mechanism (60) is unlocked to release the upper support member (40) and the lower support member (50), such that the front leg (10) is able to be folded with respect to the bottom tube (30).

A stroller frame includes a front leg, a bottom tube, a rear leg, an upper support member and a lower support member. The front leg, the bottom tube, the lower support member and the upper support member are pivotally connected to each other to form a four-bar linkage structure. The rear leg is connected to an end of the bottom tube. A lock mechanism is disposed at a pivot joint between the upper support member and the lower support member. The lock mechanism is able to lock the upper support member and the lower support member at an expanded angle, such that the front leg is able to be expanded with respect to the bottom tube. The lock mechanism is unlocked to release the upper support member and the lower support member, such that the front leg is able to be folded with respect to the bottom tube.

Stroller or stroller frame, comprising at least one motor, in particular an electric motor, for in particular assisted driving of the stroller or stroller frame, at least one pusher for pushing the stroller or stroller frame, at least one force sensor device for detecting a force-related variable, in particular a force or a force component which acts on the pusher, or a variable derived from this force or force component, for example a torque or a change over time of the force or force component, and at least one control unit which is configured to initiate a calibration of the force sensor device depending on a result of at least one detection of the force-related variable, in particular depending on the result of a plurality, of preferably at least 3, in particular successive, detections of the force-related variable.

A stroller includes a frame having a front wheel frame, a back wheel frame, and a handlebar frame, a first linkage coupled to the back wheel frame and the handlebar frame, and a second linkage coupled to the back wheel frame and the front wheel frame. The first linkage and the second linkage are configured to enable movement of the frame between an open, operational position and a closed, collapsed position. The stroller further includes a gear mechanism coupled to the first linkage and the second linkage. The gear mechanism includes a first gear coupled to the first linkage and a second gear coupled to the second linkage. The first gear and the second gear rotate relative to one another.