Latch for securing a truck door

Claim 1

A LATCH FOR SECURING A TRUCK DOOR TO ITS SILL, COMPRISING A ROTOR, A HANDLE FIXED TO SAID ROTOR, MEANS INCLUDING AN ATTACHING PLATE INTERPOSED BETWEEN SAID LATCH AND HANDLE FOR JOURNALLING SAID ROTOR ON SAID TRUCK DOOR TO SWING ABOUT AN AXIS GENERALLY PERPENDICULAR THERETO AND ADJACENT SAID SILL WHEN THE DOOR IS CLOSED, A C-SHAPED LATCH FIXED AT ONE END TO SAID ROTOR AND HAVING A CAM FACE OPPOSING SAID ROTOR, A CATCH FIXED TO SAID SILL AND HAVING A STRIKE FACE POSITIONED TO ENGAGE SAID CAM FACE, SAID CAM FACE BEING ARRANGED TO DRAW SAID ROTOR TOWARD SAID CATCH WHEN SAID HANDLE IS TURNED TO TIGHTEN THE ENGAGEMENT BETWEEN SAID CAM FACE AND STRIKE FACE, AND SPRING MEANS CONNECTED AT ONE END TO SAID ROTOR AT A PLACE REMOTE FROM ITS AXIS AND ADAPTED TO BE CONNECTED AT ITS OTHER END TO SAID ATTACHING PLATE, SAID SPRING MEANS TRAVELING BEYOND DEAD CENTER AND IN THE ENGAGED POSITION OF SAID CAM AND STRIKE FACES BIASING SAID ROTOR TO URGE SAID CAM FACE INTO FIRMER ENGAGEMENT WITH SAID STRIKE FACE, WHEREBY LATCHING PRESSURE IS INCREASED IN RESPONSE TO TRUCK VIBRATIONS, AND IN THE OPPOSITE EXTREME POSITION OF SAID ROTOR BIASING IT TO HOLD SAID LATCH AWAY FROM SAID CATCH, SAID SPRING MEANS COMPRISING A FIRST TELESCOPIC MEMBER, MEANS PIVOTALLY ATTACHING SAID FIRST TELESCOPIC MEMBER TO SAID ROTOR, A COMPANION SECOND TELESCOPIC MEMBER, MEANS PIVOTALLY ATTACHING SAID SECOND TELESCOPIC MEMBER TO SAID ATTACHING PLATE, AND A HELICAL COMPRESSION SPRING SURROUNDING SAID TELESCOPIC MEMBERS AND COMPRESSIVELY INTERPOSED BETWEEN BOTH OF SAID PIVOTALLY ATTACHING MEANS.