Abstract: A multiple-function cart includes a main body, a handle, a tail board, four wheel sets and a strap unit. The main body includes a front portion pivotably connected to a rear portion by a first pivotal unit. The front portion is pivoted relative to the rear portion by the first pivotal unit. The handle is pivotably connected to the rear portion by two second pivotal units and is pivotable about the first pivotal unit. The four wheel sets are respectively connected to the front and rear portion. The strap unit is connected to the handle and includes a strap. The tail board is pivotably connected to the front portion so as to be parallel or perpendicular to the front portion. The cart can be carried on the user's back or used as a normal cart on the ground.

Abstract: A cart includes a first frame having two side tubes and each of the two side tubes has a first wheel connected thereto. A second frame is pivotably connected to the first frame and has a transverse tube. Two second wheels are connected to the transverse tube. A locking device is slidably connected to the first frame so as to be positioned at a first position or a second position. When the locking device is set at the first position, the second frame is pivoted to a position substantially parallel to the first frame, and the first wheels support the cart. When the locking device is set at the second position, the second frame is pivoted to a position substantially perpendicular to the first frame. The first and second wheels support the cart.

Abstract: A convertible hand truck includes a primary frame, a secondary frame and a linkage member. The primary frame has a hook member and a pair of wheels rotatably mounted thereon. The secondary frame has at least one caster rotatably mounted thereon. The linkage member has one end pivotally joined to the primary frame, and the other end pivotally joined to the secondary frame. In particular, the primary frame is movable into (a) a hand-truck position, generally parallel to the secondary frame, (b) a reclined-cart-position, generally positioned at a predetermined angle with respect to the secondary frame, and (c) a platform-cart position, generally perpendicular to the secondary frame. And while the primary frame is in the reclined-cart-position or the platform-cart position, the hook member of the primary frame secures the primary frame to the secondary frame, and the pair of wheels of the primary frame cooperates with the caster of the secondary frame to support the primary frame.

Abstract: A foldable luggage carrier includes a frame, a supporting tray and a pair of wheeled carriages. The tray has a pair of pivot brackets pivotally connected to two leg portions of the frame such that the tray is pivotable between a forwardly extended position and a fold-up position. Each of the pivot brackets includes a pair of opposed plates and a cam portion at a corner. Each of the wheeled carriages includes a wheel bracket having a sleeve bearing rotatably supported on the leg portions of the frame to permit the wheeled carriages to pivot between rearwardly extended positions and folded-in positions. The sleeve bearing has a guiding slope section at a bottom to interact with each cam portion of the pivot bracket in a manner such that the wheeled carriages automatically pivot to the folded-in positions and the rearwardly extended positions when the tray is moved between the fold-up position and the forwardly extended position.

Abstract: A foldable platform truck includes a platform, two wheel-connecting bars rotatably attached to the platform, a handle assembly, a handle release and locking mechanism for controlling the handle assembly, a pair of first gear members and a pair of second gear members. The handle release and locking mechanism has an actuator to be operated to allow the handle assembly to pivot between an upright position and a horizontal position. When the handle assembly is in the horizontal position, the wheels are folded up underneath the platform and lie horizontally with respect thereto. And, when the handle assembly is pulled away from the platform to the upright position, the first gear members engage and turn the second gear members, resulting in the wheel-connecting bars rotating to fold out the wheels from underneath the platform toward an eventual perpendicular position with respect to the underside of the platform.

Abstract: A foldable platform truck includes a platform, two wheel-connecting bars rotatably attached to the platform, a handle assembly, a handle release and locking mechanism for controlling the handle assembly, a pair of first gear members and a pair of second gear members. The handle release and locking mechanism has an actuator to be operated to allow the handle assembly to pivot between an upright position and a horizontal position. When the handle assembly is in the horizontal position, the wheels are folded up underneath the platform and lie horizontally with respect thereto. And, when the handle assembly is pulled away from the platform to the upright position, the first gear members engage and turn the second gear members, resulting in the wheel-connecting bars rotating to fold out the wheels from underneath the platform toward an eventual perpendicular position with respect to the underside of the platform.

Abstract: A folding anchor structure for foldable hand trucks includes a loading board and a wheel set foldable simultaneously on two sides of a frame and a latch lever on a handle to latch the loading board in a folded and shrunk condition when the handle is retracted to prevent the loading board and the wheel set from loosening off from the folded condition and causing harmful effect.

Abstract: A folding anchor structure for foldable hand trucks includes a loading board and a wheel set foldable simultaneously on two sides of a frame and a latch lever on a handle to latch the loading board in a folded and shrunk condition when the handle is retracted to prevent the loading board and the wheel set from loosening off from the folded condition and causing harmful effect.