substantially fits in said leg or socket and has a groove provided with a tapering and wedging portion, and a lug which projects from said leg or socket into said groove and is adapted to be wedged into the tapering and wedging portion of the groove for drawing the enlarged base portion of the shoe into firm bearing contact with the end of the leg or socket for stationarily securing said shoe in the leg or socket.

2. The combination with a tubular leg or socket, of a shoe of hard material of solid formation provided with an enlarged base portion having a hard, smooth-surfaced bottom adapted to bear and readily slide upon a supporting surface and with an integral reduced shank which extends into

and substantially fits in said leg or socket and has a groove with an open end for the entrance of a coöperating lug and a circumferential portion, one side of which inclines toward said enlarged head, and a lug on said leg or socket which projects into said groove and is adapted to be wedged therein by turning the shoe in the leg or socket for drawing the large base of said shoe to a firm bearing against the end of the leg or socket.

Witness my hand, this 5th day of December, 1913.

JOSEPH T. WRIGHT,

F. E. BAILEY.