According to his patent specification, Yerkes patented “the revolving arrangement and combination of the sliding shaft, with the broach, or with the spool, for the purpose of removing and renewing the latter . . . .” The action of the sliding shaft enabled the operator to remove and change the spool when the spring was pressed down. In addition, he patented the ring in combination with the flyers that distributed the yarn on the spool. Yerkes intended his improvements to be used on machines for spinning cotton and other fibers.