Abstract: A device used to plug an opening into and locate a receptacle in an anchor to a base employed on a playing field. The device has an elastic body that has a shape sufficiently large to extend across the opening of the receptacle. A flexible indicator is connected to the body and indicates the location of the body. The body is made from an elastomeric material capable of being deformed to insert a portion of the body through the opening into the receptacle and expands to form a plug across the opening to prevent access of dirt into the receptacle. The flexible indicator has a length sufficient to extend from the body and for a sufficient distance to be observed when the body is mounted with the receptacle and is sufficiently flexible to be deflected during ground care operations of the playing field and be visible after such ground care operations.

Abstract: A device to support baseballs used by a pitcher during batting practice. The devices comprises a container for supporting a quantity of baseballs. An upright support member supports the container above a baseball field. Detachable connecting apparatus detachably connects the container to the upright support member. An anchor device is connected to the upright support member for securing the upright support member at a location permitting the pitcher to retrieve a baseball from the container to throw during batting practice.

Abstract: A device used to assist in constructing and repairing a pitcher's mound on a playing surface in a baseball field. An upper limit to the pitcher's mound is indicated by a beam apparatus. The beam apparatus has a horizontal extension member for indicating a plane above the playing surface that lies substantially parallel to the playing surface. An angled extension member is disposed to angle down a slope from a point where connected to the horizontal extension member. A support device supports the horizontal extension member of the beam at a chosen position above the playing surface.

Abstract: A collapsible device used in marking the batter's box on a playing surface of a baseball field. The device uses a first frame half and a second frame half. Each frame half has an elongated side with first and second ends. A first arm with an inwardly disposed end is pivotally connected to the first end of the elongated side and an outwardly disposable end that is movable between an extended position and a closed position located against the elongated side. A second arm with an inwardly disposed end is pivotally connected to the second end of the elongated side and an outwardly disposable end that is movable between an extended position and a closed position that is located against the elongated side. A first hinge pivotally connects the outwardly disposable end of the first arm of the first frame half to the outwardly disposable end of the first arm of the second frame half.