A foldable bicycle trailer has at least two main frames (1,2) disposed symmetrically about a central plane. These are connected by crossbars. The frames (1,2) stand on wheels (21,22) or on any other movable interface on its either side. The crossbars comprise a first element which is substantially flat in unfolded state, having at least two parallel foldable arms (9a, 10a) and a second element which is substantially upright in unfolded stage, also having at least two parallel foldable arms (11a, 12a). The foldable arms (9a, 10a, 11a, 12a) of each of first and second elements are connected by hinges (5, 6, 7,8) for connecting the foldable segments of each foldable arm.

Implementations of bicycle trailers may include a first end and a second end, the second end opposite the first end, a first plurality of latches coupled to the first end, and a second plurality of latches coupled to the second end. The first plurality of latches may be configured to secure a rear-facing child's car seat facing the first end. The second plurality of latches may be configured to secure the rear-facing child's car seat facing the second end. The second plurality of latches may be configured to secure a front-facing child's car seat facing the first end.

A child transport carrier includes a lower frame, an upper frame, a rear frame, and a first upper seat support. The lower frame includes a first end and a second end. The upper frame includes a first end and a second end. The rear frame extends from the second end of the lower frame to the second end of the upper frame. The first upper seat support includes a cross-member extending transversely across the first upper seat support and having a first end and a second end. The cross-member is configured to move the first upper seat support between a first seat position and a second seat position. The upper frame extends from an upper end of the rear frame and the lower frame extends from a lower end of the rear frame.

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.

A foldable bicycle trailer has at least two main frames (1,2) disposed symmetrically about a central plane. These are connected by crossbars. The frames (1,2) stand on wheels (21,22) or on any other movable interface on its either side. The crossbars comprise a first element which is substantially flat in unfolded state, having at least two parallel foldable arms (9a, 10a) and a second element which is substantially upright in unfolded stage, also having at least two parallel foldable arms (11a, 12a). The foldable arms (9a, 10a 11a 12a) of each of first and second elements are connected by hinges (5, 6, 7,8) for connecting the foldable segments of each foldable arm.

A convertible stroller assembly may be convertible between a stroller configuration and a trailer configuration. The assembly includes a stroller frame including a pair of laterally opposed hubs. The assembly further includes a plurality of wheels coupled to the stroller frame and including at least one removable front wheel. The assembly further includes a seat frame adjustably coupled to the stroller frame. The seat frame is adjustable relative to the pair of laterally opposed hubs between a first position and a second position lower than the first position. The assembly is convertible between (i) a stroller configuration in which the front wheel is coupled to the stroller frame and the seat frame is in the first position, and (ii) a trailer configuration in which the front wheel is absent and the seat frame is in the second position having a lower center of gravity than the first position.

A child transport carrier includes a lower frame, an upper frame, a rear frame, and a first upper seat support. The lower frame includes a first end and a second end. The upper frame includes a first end and a second end. The rear frame extends from the second end of the lower frame to the second end of the upper frame. The first upper seat support includes a cross-member extending transversely across the first upper seat support and having a first end and a second end. The cross-member is configured to move the first upper seat support between a first seat position and a second seat position. The upper frame extends from an upper end of the rear frame and the lower frame extends from a lower end of the rear frame.

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.

Disclosed is a bike trailer having a main frame and a seat structure. The main frame defines an accommodating space for a passenger or load to be transported. The seat structure is transferable between an operational state in which the seat structure forms a seating area for the passenger, and a stowed state in which the seat structure is folded away thereby allowing the transport of loads other than passengers. The seat structure comprises a backrest portion with a seating side for at least partially contacting the back of a passenger. The backrest portion is accommodatable in the bike trailer such that at least the seating side of the backrest portion is protected against contact with loads to be carried when the seat structure is in the stowed state.

A bracket, which can be in the form of first and second bracket members, desirably projects outwardly from the trailer frame and includes a bracket passageway. A housing includes a housing passageway extending at least partially through the housing and that communicates with the exterior of the housing through a locking insert receiving opening. The locking insert receiving opening, the housing passageway and the bracket passageways define a locking insert receiving passageway. A locking insert couples the housing to the bracket and thereby to the trailer frame. The locking insert includes an accessory arm receiving passageway communicating with the housing exterior through the locking insert receiving opening.