"This invention relates to an improved means for enabling metal rods to be attached to sockets for the economical and efficient manufacture of wrenches.." It relates to Bellows' January 11, 1916 patent (no. 1,167,542).
Used for "speeder" and "T" handle socket wrenches; the "ball" speed wrench handles shown in the 2nd image correspond to S.R. Enberg patent no. 1,626,671.