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613,797
a longitudinal groove having an enlargement providing recesses in the sides of the groove, and a locking-piece fitting in the enlargement and having sides extending into the recesses; 5 substantially as described. 2. The combination of a spike formed with a longitudinal groove having an enlargement providing recesses in the sides of the groove curved outwardly at their sides, and a lock-
ing-piece formed with outwardly-curved sides rio fitting in the recesses, with a rear incline at its upper end, slightly curved forward at its lower end, and with front teeth or serrations; substantially as described. ROY DODSON. In presence of- E. S. KNIGHT, STANLEY STONER.