Instrument for measuring hardness of the surface of a resilient roll

Claim 1

AN APPARATUS FOR DETERMINING THE EXISTENCE AND LOCATION OF RELATIVELY HARD SPOTS IN A RESILIENT LAYER OF MATERIAL ON A CYLINDRICAL ROLL HAVING SUBSTANTIALLY THE RESILIENCY OF RUBBER COMPRISING, A PAIR OF HORIZONTALLY SPACED END BEARINGS POSITIONED FOR ROTATABLY SUPPORTING THE ROLL FOR ROTATION ABOUT THE ROLL AXIS, A ROTATABLE TESTING WHEEL HAVING A SUFFICIENTLY SMALL WIDTH TO SINK INTO SAID SURFACE LAYER, WITH FORCE APPLIED THERETO, A CARRIAGE SUPPORTING THE WHEEL FOR ROTATION ABOUT AN AXIS SUBSTANTIALLY PARALLEL TO SAID ROLL AXIS, A TRAVERSING GUIDE EXTENDING ACCURATELY PARALLEL TO SAID ROLL AXIS FOR THE LENGTH OF THE ROLL AND SUPPORTING SAID CARRIAGE FOR MOVEMENT ALONG THE ROLL AT A UNIFORM DISTANCE FROM THE ROLL AXIS, A STRONG SPRING HAVING A FIRST PORTION MOUNTED ON THE CARRIAGE BIASING THE WHEEL TOWARD THE ROLL, SAID SPRING HAVING SUFFICIENT STRENGTH TO FORCE THE WHEEL INTO SAID SURFACE LAYER TO DEFORM THE SURFACE THEREOF, SAID SPRING HAVING A SECOND PORTION SUPPORTING SAID WHEEL, MEANS ADJUSTABLY MOUNTING THE FIRST PORTION OF THE SPRING ON THE CARRIAGE SO THAT THE POSITION OF THE FIRST PART CAN BE ADJUSTED AND THE BIASING FORCE CHANGED FOR OBTAINING SUFFICIENT FORCE ON THE WHEEL TO DEPRESS SAID LAYER, AND MEANS FOR MEASURING THE RELATIVE CHANGE IN DISTANCE BETWEEN SAID FIRST AND SECOND SPRING PORTIONS TO MEASURE CHANGE IN RESILIENCY OF THE LAYER ON THE ROLL AS A FUNCTION OF RADIAL CHANGE IN WHEEL POSITION RELATIVE TO THE ROLL AXIS.

Claim 2

AN APPARATUS FOR DETERMINING THE EXISTENCE AND LOCATION OF RELATIVELY HARD SPOTS IN A RESILIENT LAYER OF MATERIAL ON A CYLINDRICAL ROLL HAVING SUBSTANTIALLY THE RESILIENCY OF RUBBER COMPRISING, A PAIR OF HORIZONTALLY SPACED END BEARINGS POSITIONED FOR ROTATABLY SUPPORTING THE ROLL FOR ROTATION ABOUT THE ROLL AXIS, A ROTATABLE TESTING WHEEL HAVING A SUFFICIENTLY SMALL WIDTH TO SINK INTO SAID SURFACE LAYER, WITH FORCE APPLIED THERETO, A CARRIAGE SUPPORTING THE WHEEL FOR ROTATION ABOUT AN AXIS SUBSTANTIALLY PARALLEL TO SAID ROLL AXIS, A TRAVERSING GUIDE EXTENDING ACCURATELY PARALLEL TO SAID ROLL AXIS FOR THE LENGTH OF THE ROLL AND SUPPORTING SAID CARRIAGE FOR MOVEMENT ALONG THE ROLL AT A UNIFORM DISTANCE FROM THE ROLL AXIS, A STRONG SPRING HAVING A FIRST PORTION MOUNTED ON THE CARRIAGE BIASING THE WHEEL TOWARD THE ROLL, SAID SPRING HAVING SUFFICIENT STRENGTH TO FORCE THE WHEEL INTO SAID SURFACE LAYER TO DEFORM THE SURFACE THEREOF, SAID SPRING HAVING A SECOND PORTION SUPPORTING SAID WHEEL, MEANS ADJUSTABLY MOUNTING THE FIRST PORTION OF THE SPRING ON THE CARRIAGE SO THAT THE POSITION OF THE FIRST PART CAN BE ADJUSTED AND THE BIASING FORCE CHANGED FOR OBTAINING SUFFICIENT FORCE ON THE WHEEL TO DEPRESS SAID LAYER, AND MEANS FOR MEASURING THE RELATIVE CHANGE IN DISTANCE BETWEEN SAID FIRST AND SECOND SPRING PORTIONS TO MEASURE CHANGE IN RESILIENCY OF THE LAYER ON THE ROLL AS A FUNCTION OF RADIAL CHANGE IN WHEEL POSITION RELATIVE TO THE ROLL AXIS.