Abstract: A turf coring tool includes a tubular cut out wall section turf coring tine having an upper tubular end for receiving force contained within a socket and having this upper end of the coring tine walls severed with an axial slit from the cut out area, allowing the slit walls to become flexible counter to the axis of the tine. A tube having elastic qualities is placed in the slit section and compressed by a washered screw wrenched into the socket base to allow the distortion of the inserted elastic tube to distort the flexible slit tine walls against the inner walls of the socket. The resultant pressure against the distorted tine walls will allow them to become bound in the socket. Wrenching to relieve the elastic compression will cause the tine to be free and released from socket.

Abstract: A turf perforating machine for aerating lawns by removing plugs therefrom comprising a wheeled frame having a plurality of reciprocating tools, each connected by a linkage to an eccentric mounted on a journal and each linkage slidably mounted in a pivotable guide secured to the journal which prevents binding of the linkage as the frame is moved across the lawn and the tool is disposed in the ground, and including further a retractor unit for pivoting the guide, linkage and tools to a nonperforating position.

Abstract: A turf perforating device for aerating lawns by removing plugs therefrom comprising a wheeled frame having a plurality of reciprocating tools connected by a linkage to a crankshaft and each linkage slidably mounted in a pivotable sleeve which prevents binding of the linkage as the frame is moved across the lawn and the tool is disposed in the ground.