A cargo handling system is disclosed. In various embodiments, the cargo handling system includes a first rail defining an upward facing surface and a longitudinal direction and a lateral direction; a platform having a first recessed channel configured to engage an upper portion of the first rail to prevent a movement of the platform in the lateral direction and configured for rolling engagement with the first rail; and a first drive assembly disposed within the platform and configured to propel the platform along the first rail in the longitudinal direction, the first drive assembly having a first drive roller and a first motor.

A cargo handling system is disclosed. In various embodiments, the cargo handling system includes a first rail defining an upward facing surface and a downward facing surface and a longitudinal direction and a lateral direction; a platform configured for rolling engagement with the first rail; and a first tug configured to propel the platform along the first rail in the longitudinal direction, the first tug comprising a power drive unit having a first drive wheel and a guide unit having a first guide wheel.

A material handling cart is provided, having a frame with wheels and engaging members for supporting a part carried by the cart. Each engaging member has an engaging surface including a material for protecting a corresponding surface of the part from damage. Upper supports are attached to the frame and extend upward to a distal end, and have a height equal to or greater than a height of the part when the part is carried by the cart. Each upper support has an upper stacking coupler at its distal end. Lower stacking couplers are attached to the bottom of the frame. The lower stacking couplers engage upper stacking couplers of a second identical cart, to stack the cart above the second cart. The upper stacking couplers engage lower stacking couplers of a third identical cart, to stack the third material handling cart above the cart.

A material handling cart is provided, having a frame with wheels and engaging members for supporting a part carried by the cart. Each engaging member has an engaging surface including a material for protecting a corresponding surface of the part from damage. Upper supports are attached to the frame and extend upward to a distal end, and have a height equal to or greater than a height of the part when the part is carried by the cart. Each upper support has an upper stacking coupler at its distal end. Lower stacking couplers are attached to the bottom of the frame. The lower stacking couplers engage upper stacking couplers of a second identical cart, to stack the cart above the second cart. The upper stacking couplers engage lower stacking couplers of a third identical cart, to stack the third material handling cart above the cart.

A heavy duty carriage includes a carriage body, a load receiving platform horizontally rotatably mounted on a top of the carriage body, and a plurality of caster bodies each horizontally rotatably supported by a caster shaft in a lower part of the carriage body. Each of the caster bodies has, in a lower part thereof, a front wheel rotatably supported by a front wheel shaft and rear wheels each rotatably supported by a rear wheel shaft. The front wheel and the rear wheels are positioned forward and rearward of an axial center of the caster shaft on a straight line in a horizontal direction. When the carriage body is placed on a floor surface and outer circumferences of the rear wheels contact the floor surface, an outer circumference of the front wheel does not contact the floor surface. By using four heavy duty carriages, the heavy object can be moved.

A heavy duty carriage includes a carriage body, a load receiving platform horizontally rotatably mounted on a top of the carriage body, and a plurality of caster bodies each horizontally rotatably supported by a caster shaft in a lower part of the carriage body. Each of the caster bodies has, in a lower part thereof, a front wheel rotatably supported by a front wheel shaft and rear wheels each rotatably supported by a rear wheel shaft. The front wheel and the rear wheels are positioned forward and rearward of an axial center of the caster shaft on a straight line in a horizontal direction. When the carriage body is placed on a floor surface and outer circumferences of the rear wheels contact the floor surface, an outer circumference of the front wheel does not contact the floor surface. By using four heavy duty carriages, the heavy object can be moved.

A ladder transport device for use with a detachable ladder handle. The transport device has an axle and pair of wheels which are mounted on a body. The axle and wheels are rotatable and axially moveable relative to the body. The transport device body is securable to the detachable handle. The detachable handle is securable to the exterior side of a ladder near the end of the ladder. The user can then roll the ladder on the wheels by lifting and pulling on the opposite end of the ladder. Stability is improved by horizontally aligning the cross sectional center of gravity of the ladder between the wheels.

A ladder transport device for use with a detachable ladder handle. The transport device has an axle and pair of wheels which are mounted on a body. The axle and wheels are rotatable and axially moveable relative to the body. The transport device body is securable to the detachable handle. The detachable handle is securable to the exterior side of a ladder near the end of the ladder. The user can then roll the ladder on the wheels by lifting and pulling on the opposite end of the ladder. Stability is improved by horizontally aligning the cross sectional center of gravity of the ladder between the wheels.

A dolly has a frame; a plurality of rolling elements mounted on the frame for rotation about respective rotational axes generally parallel to the ground surface and defining a contact footprint of the dolly on the ground surface. The axes extend in a plane between a load contacting surface of the dolly and the ground surface at a distance between 30% and 50% of a height defined between the load contacting surface of the dolly and the ground surface. A swivel platform defines the load contacting surface extending at an elevation above the frame and mounted on the frame for rotation about a platform axis located within the contact footprint. An actuator unit is drivingly engaged to at least two rolling elements of the plurality of rolling elements, the at least two rolling elements disposed on opposite sides of the swivel platform. An on-board controller unit is operable to actuate the actuator unit.

A dolly has a frame; a plurality of rolling elements mounted on the frame for rotation about respective rotational axes generally parallel to the ground surface and defining a contact footprint of the dolly on the ground surface. The axes extend in a plane between a load contacting surface of the dolly and the ground surface at a distance between 30% and 50% of a height defined between the load contacting surface of the dolly and the ground surface. A swivel platform defines the load contacting surface extending at an elevation above the frame and mounted on the frame for rotation about a platform axis located within the contact footprint. An actuator unit is drivingly engaged to at least two rolling elements of the plurality of rolling elements, the at least two rolling elements disposed on opposite sides of the swivel platform. An on-board controller unit is operable to actuate the actuator unit.