Spring testing machine

Claim 1

A SPRING TESTER FOR VISUALLY GRAPHING THE LOAD VS. DEFLECTION CHARACTERISTICS OF A COMPRESSION SPRING COMPRISING: A BASE STRUCTURE HAVING THEREON A PLURALITY OF MEMBERS RELATIVELY MOVABLE TO APPLY FORCE TO A SPRING UNDER TEST, SAID MEMBERS COMPRISING AN UPPER PLATE FIXED ON SAID BASE STRUCTURE AND ENGAGING ONE SIDE OF SAID SPRING, A MIDDLE PLATE MOVABLE RELATIVE TO SAID BASE STRUCTURE AND ENGAGING THE OTHER SIDE OF SAID SPRING, A LOWER PLATE MOVABLE RELATIVE TO SAID MIDDLE PLATE AND TO SAID BASE STRUCTURE, AND A FORCE PRODUCING RAM MECHANISM ON SAID BASE STRUCTURE ENGAGING SAID LOWER PLATE THUS TOMOVE THE LATTER; A FORCE TRANSDUCER ENGAGING SAID MIDDLE PLATE AND SAID LOWER PLATE, OPERATIVE TO TRANSMIT FORCE FROM SAID RAM MECHANISM AND SAID LOWER PLATE TO SAID MIDDLE PLATE AND TO PROVIDE A FIRST ELECTRICAL SIGNAL PROPORTIONAL TO THE RELATIVE MOVEMENT BETWEEN SAID MIDDLE AND LOWER PLATES, A MOVEMENT TRANSDUCER ENGAGED WITH SAID MIDDLE AND UPPER PLATES TO PROVIDE A SECOND ELECTRICAL SIGNAL THEREFROM PROPORTIONAL TO THE AMOUNT OF DEFLECTION OF THE SPRING BY SAID FORCE; AND AN ELECTRICALLY RESPONSIVE X-Y RECORDER HAVING A RECORDING PEN MOVED IN THE COORDINATE DIRECTIONS BY SAID FIRST AND SECOND ELECTRICAL SIGNALS FROM SAID TRANSDUCERS TO GRAPH THE LOAD VS. DEFLECTION CHARACTERISTICS OF THE SPRING UNDER TEST.