A trailer for providing a usable space. The trailer includes a wheeled underframe with a base element which is at least partially open at a top, a roof element with a roof surface and four adjacent side walls, and a connection element which connects the base element to the roof element in a set-up state. The connection element has an upper surface with at least two adjacent, opposite side walls. In a travel state, the roof element surrounds the connection element and the base element from an outside at the top and at least partially at the sides. To provide the set-up state of the trailer, the roof element extends a dimension of the base element by being erected substantially vertically, and the connection element increases a height of the base element by being erected, so as to provide a firmly enclosed usable space in an interior of the trailer.

A motor-driven trailer and towbar system includes a towbar having a vehicle side end configured to connect with the vehicle and a trailer side end configured to connect with a trailer coupling. The towbar is pivotably coupled to the trailer and configured to pivot along a pivoting path (P) between a lowered position (L) and a raised position (R) with respect to the trailer. At least one first sensor element is configured to detect a position of the towbar along the pivoting path (P). A control unit (TCU) is in communication with the at least one first sensor element and is configured to switch the system between an operating mode and a parking mode. The system is switched into the parking mode when the towbar is in a raised position (R) and is switched into the operating mode when the towbar is in a lowered position (L).

A bike trailer with improved top cover includes a trailer frame installed with a seat, a top cover, a left panel and a right panel. One side of the top cover is fixed to one side of the trailer frame. A connecting member and a connected member are respectively provided between the other side of the top cover and the other side of the trailer frame so that the top cover can be opened when the connecting member is disengaged from the connected member. The top cover is provided with an accommodating space along the direction of opening to receiving direction, and a stretched and straightened coiled leaf spring is installed in the accommodating space and fixed on the top cover.

A stroller is provided with the ability to removably couple and decouple a seat from the stroller as needed. The stroller can include a stroller frame. The stroller can also include one or more front wheels attached to the stroller frame and one or more rear wheels attached to the stroller frame. The stroller can also include a first seat coupled to the stroller frame. The stroller can include first and second seat attachment housings. Each of the seat attachment housings can include a cavity for receiving a corresponding one of the first and second seat attachment adapters. Each of the seat attachment housings can also include a door cover to prevent access to the respective cavity when not in use. The seat attachment adapters can be coupled to the respective seat attachment housings and a second seat can be coupled to the seat attachment adapters.

A vehicle for transporting persons and/or goods, having at least one frame which includes of at least one frame element which extends substantially parallel or obliquely to the longitudinal direction of the vehicle, at least one wheel carrier which can be detachably secured to the frame element and which, together with the frame element, forms a receiving region between the wheel carrier and the frame element. The wheel carrier and the frame element are spaced apart from one another at least in sections so as to form a cavity. The frame also includes at least one wheel unit which includes a wheel and can be fixed or is fixed in a rotatably mounted manner at least in sections in the receiving region between the wheel carrier and the frame element.

A trailer apparatus is provided having two half forms connected to a frame joint, the half forms mounted on a first and second pivot bar on the joint frame to pivot to open and to pivot to close in a clam shell arrangement. The trailer apparatus may assume a form of backpack or luggage piece adapted to store items and may assume the form of a towable trailer, having a tow bar, wheels, and a three-dimensional covering over the open sides of the half forms to enclose cargo space or to keep a pet inside the footprint of the half form adapted as trailer bed when the trailer apparatus is extended for use.

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.

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 connector device for connecting a first vehicle to a second vehicle, the connector device comprising an upper frame and a lower frame, where the rear side of the upper frame is configured to pivotally connect to the front upper side of the second vehicle, about a first rotation axis, and the rear side of the lower frame is configured to pivotally connect to the front lower side of the second vehicle, about a second rotation axis that is angular in respect to the first rotation axis. The non-zero angle formed between the rotation axes restricts the rotation movements at least about one of these axes. The connector device can be used for forming a removable chain of main and towed vehicle(s) in a manner that enables folding of a towed vehicle over the first vehicle and removably connecting as many vehicles to be towed as required.

A child trailer has a bottom frame and a side frame, and a folding joint is disposed on the tail support of the trailer. A front end of the bottom frame is rotationally connected with a front end of the side frame. A top support rod is fixed at a rear end of the side frame. Left and right ends of the top support rod are respectively connected with an upper-section tail support rod rotating around an axis thereof. A tail end of the upper-section tail support rod is connected with a folding joint. The other end of the folding joint is connected with a lower-section tail support rod. A rear end of the bottom frame is connected with a tail rack rotating around a shaft parallel to the axis of the top support rod.