Abstract: Carts for transporting doors, sheets of plywood and dry wall, narrow crates, mirrors, and other large, awkward-to-handle and perhaps fragile articles of similar configurations in a horizontal orientation which allows the object to be freely manipulated through a doorway or other opening. The article is automatically and securely clamped between cooperating fixed and displaceable jaws in the process of loading it into the cart; and the article is thereafter automatically released from the jaws when it is lifted upwardly to remove it from the cart. An easily removable handle makes the cart easy to manipulate and, at the same time, permits it to easily be broken down for storage, shipment, etc. Front and rear, leglike stops limit fore-and-aft tilting of the door cart and thereby facilitate the loading of materials into the cart.