Indicating device for roller brake testers

Claim 1

FOR USE WITH A ROLLER-TYPE BRAKE TESTER FOR VEHICLE WHEEL BRAKES WHICH HAS A FIRST CONTINUOUS OUTPUT MEANS DIRECTLY PROPORTIONAL IN MAGNITUDE TO INSTANTANEOUS BRAKING FORCE ON A VEHICLE RIGHT WHEEL AND A SECOND CONTINUOUS OUTPUT MEANS DIRECTLY PROPORTIONAL IN MAGNITUDE TO INSTANTANEOUS BRAKING FORCE ON A VEHICLE LEFT WHEEL, A DEVICE FOR RECEIVING BOTH OF SAID OUTPUT MEANS AND INDICATING BRAKING FORCE ON BOTH WHEELS LINEARLY IN CLOSE JUXTAPOSITION COMPRISING: A FRAME; A FIRST LINEARLY, ELASTICALLY EXTENSIBLE-CONTRACTILE ELEMENT HAVING TWO ENDS; A SECOND LINEARLY, ELASTICALLY EXTENSIBLE-CONTRACTILE ELEMENT HAVING TWO ENDS, SAID FIRST AND SECOND ELEMENTS BEING GENERALLY PARALLEL AND SIDE-BY-SIDE AND EACH HAVING ONE END SECURED TO SAID FRAME; THE OTHER END OF SAID FIRST ELEMENT CONNECTED TO SAID FIRST CONTINUOUS OUTPUT MEANS, THE OTHER END OF SAID SECOND ELEMENT CONNECTED TO SAID SECOND CONTINUOUS OUTPUT MEANS; AN INDICATOR FIXED TO EACH ELEMENT OTHER END FOR LINEAR MOVEMENT WITH THE RESPECTIVE ELEMENT OTHER END; AND STRAIGHT-LINE SCALE MEANS HAVING A DATUM AND CONSTRUCTED AND ARRANGED TO BE SWEPT OVER BY SAID INDICATORS WHEREBY ABSOLUTE VALUE OF BRAKING FORCE IS INDICATED FOR EACH WHEEL AS THE SCALE DISTANCE OF THE RESPECTIVE INDICATE FROM SAID DATUM AND THE DIFFERENCE IN