dimensions and configurations of the base and slip plates the size and configuration of the lock out tabs may be modified with reference to fig4 and 5 the use of the floor treatment machine 12 will now be described in normal operation the torque limiter assembly 200 transfers torque from the drive linkage 100 of the floor treatment machine to spin the floor treatment head 24 first the floor treatment head containing the torque limiter assembly is attached to the drive linkage of the floor treatment machine by inserting the drive linkage through the retaining ring 202 the head is then twisted to engage the projections 102 on the drive linkage with the channels 234 in the hole of the drive ring 206 after the head 24 is attached to the machine 12 the machine operator 34 positions the assembled machine over the area of the floor 18 to be treated the operator grasps the control handle 14 and activates the machine causing the head to spin in normal operation the notches 236 of the drive plate 206 are nested on the teeth 242 of slip plate 208 as illustrated in fig4 when the spinning head encounters a surface obstruction that inhibits the spinning of the head the torque on the drive and slip plates will increase when the torque exceeds a predetermined level the spring bias forcing the drive and slip plates together is overcome by the vertical force component from the torque acting on the engagement faces of the teeth and notches when the spring bias force is overcome the slip and drive plates disengage as illustrated by fig5 upon disengagement there is relative motion between the drive and slip plates thereby relieving the torque applied to the drive linkage 100 and.