Abstract: This invention relates generally to devices which are designed to prevent loss of shopping carts from shopping center parking lots or other areas where use thereof is expected. More specifically, it relates to a particular wheel design which locks when removal is attempted and thereby provides a braking action under certain circumstances, namely when removal of the shopping cart from a given area is attempted. This locking of the wheel occurs when the longitudinal axis of the cart to which the wheel is attached, which is normally horizontal, is tilted away from the horizontal in order to negotiate curbs or when traversing a sloped surface such as a driveway and the like.

Abstract: This invention relates generally to devices designed to prevent removal of shopping carts from parking lots of supermarkets. More specifically it relates to a device which incorporates a specially designed wheel which cooperates with a specific surface configuration so as to provide braking of shopping carts when removal thereof from area immediately adjacent to the store, namely a slanted wheel cooperating with slanted raised paved surfaces to cause said wheel to swivel a maximum of 90.degree. about an axis perpendicular to the rotational axis of the wheel thus preventing such rotation.