Fluid pressure actuated control device for indicating low speed of a rotatable member

Claim 1

A LOW SPEED INDICATIING APPARATUS COMPRISING AT LEAST ONE FLUID NOZZLE, A SOURCE OF FLUID UNDER PRESSURE CONNECTED TO SAID NOZZLE AND CAUSING A JET OF FLUID TO FLOW THEREFROM, A CONDUIT MEMBER DEFINING A FLUID RECEIVING ORIFICE SPACED FROM SAID NOZZLE AND ALIGNED TO RECEOVER A SUBSTANTIAL AMOUNT OF THE FLUID FROM SAID JET, PRESSURE RESPONSIVE MEANS CONNECTED TO SAID CONDUIT MEMBER AND RECEIVING FLUID FROM SAID FLUID RECEIVING ORIFICE, SWITCHING MEANS ARRANGED TO BE ACTIVATED BY SAID PRESSURE RESPONSIVE MEANS AFTER THE JET HAS FLOWED INTO THE FLUID REEIVING ORIFICE FOR A PREDETERMINED LENGTH OF TIME, MEANS RESETTING SAID PRESSURE RESPONSIVE MEANS TO ITS INITIAL POSITION WHEN THE FLUID JET IS BLOCKED FROM FLOWING INTO TH FLUID RECEIVING ORIFICE, AND A MOVABLE MEMBER DISPOSED BETWEEN THE ORIFICE AND THE NOZZLE AND DEFINING SPACED APERTURES, WHEREBY SAID FLUID JET IS INTEMITTENTLY UNIMPEDED FOR PERIODS OF TIME DETERMINED BY THE SPEED OF SAID MOVABLE MEMBER.