SPRING COUPLING AND DRIVER.

This is an article long wanted in a number of situations where power is applied by stiff gearing, such for example, as where one or more run of stones are driven by spur or bevel gearing. The coupling is secured to connect the ends of the principal driving shafts as in the style of an ordinary coupling, or in case of back-lash in the mill spindles it is placed immediately above the gear in such a manner as to allow it to be easily moved up out of gear, at the same time producing an elastic movement in the transmission of power. It gives the advantage of a belt connection in a great measure, in allaying the jar produced by fast running gear. It is constructed of cast iron in two parts, with a space or opening between to receive the requisite number of large stiff rubber springs; each half is secured independently to the ends of the two shafts needed to be coupled, and the power is transmitted by pressure upon the springs; a like connection is made with the gear or trundle-head and mill-spindle of a mill stone. They are furnished of different sizes to suit the situation and amount of power to be conveyed.