Testing device for tractor pulling power

Claim 1

APPARATUS FOR TESTING THE PULLING POWER OF A TRACTOR OR THE LIKE COMPRISING, A BASE, A DRUM ASSEMBLY ROTATABLY MOUNTED ON SAID BASE, BRAKE MEANS ON SAID DRUM ASSEMBLY, ADJUSTABLE MEANS ON SAID BRAKE MEANS TO HOLD SAID BRAKE MEANS IN A FIXED PREDETERMINED PRESSURE ENGAGING RELATIONSHIP WITH SAID DRUM ASSEMBLY, A FLEXIBLE STRAP WOUND ON SAID DRUM ASSEMBLY AND ADAPTED AT ONE END FOR REMOVABLE ATTACHMENT TO A TRACTOR OR THE LIKE, THE UNWINDING OF SAID STRAP FROM SAID DRUM ASSEMBLY IN RESPONSE TO A PULLING FORCE BY A TRACTOR PRODUCING A PROGRESSIVELY DECREASING TORQUE ARM ABOUT THE AXIS TO THE LINE OF PULL OF SAID STRAP AND THEREBY AS SAID STRAP UNWINDS REQUIRING A PROGRESSIVELY GREATER PULLING FORCE BY THE TRACTOR TO ROTATE SAID DRUM ASSEMBLY AGAINST THE COUNTERFORCE OF SAID BRAKE MEANS, A PULLMETER REMOVABLY ATTACHED TO SAID BASE, MEANS FOR SECURING SAID PULLMETER TO AN IMMOVABLE ANCHOR, THE AMOUNT OF COUNTERFORCE PROVIDED BY THE FIXED SETTING OF SAID BRAKE MEANS BEING AT LEAST EQUAL TO THE RATED PULLING POWER OF THE TRACTOR BEING TESTED, THE LENGTH OF SAID STRAP BEING SUFFICIENT SO THAT BEFORE IT IS COMPLETELY UNWOUND THE AMOUNT OF FORCE REQUIRED FROM THE TRACTOR TO ROTATE SAID DRUM ASSEMBLY AGAINST THE RESISTANCE OF SAID BRAKE MEANS WILL HAVE SURPASSED THE RATED PULLING POWER OF THE TRACTOR, AND WHEN SAID TRACTOR''S PULLING POWER EQUALS THE RESISTANCE PROVIDED BY SAID BRAKE, THE TRACTOR ENGINE WILL DIE AND THE PULLING POWER OF THE TRACTOR AT THIS POINT WILL BE INDICATED BY SAID PULLMETER.