The following development gives a complete and exact treatment of the problem of the design of friction clutches of the expanding-shoe variety. The method followed is one which, ab initio, takes all the relevant parameters of the clutch, such as dimensions, elastic properties, and the forces-moment system to be arbitrary and then proceeds to relate them by a set of equations that illustrate the final equilibrium of the system. From the three basic equations derived, a simple and very rapid design technique is evolved which can be used reliably by technicians for the design of one such clutch to transmit a required torque. Section 10 incorporates the complete technique of design and can be interpreted simply without reference to the theoretical considerations leading to it in the preceding sections.

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