Boat trailer construction

Claim 1

IN A BOAT TRAILER OF THE TYPE HAVING A SUPPORT FRAME WITH SUPPORTING MEMBERS THEREON FOR SUPPORTING THE UNDERSURFACES OF A BOAT AND A FORWARDLY PROJECTING PORTION FOR SECUREMENT TO A DRAFT VEHICLE, AN UPRIGHT BOW STOP MAST ASSEMBLY, MEANS SECURING THE LOWER END PORTION OF SAID MAST ASSEMBLY TO SAID FORWARD FRAME PORTION, A MOUNTING PLATE CARRIED BY THE UPPER END PORTION OF SAID MAST ASSEMBLY, WINCH MEANS CARRIED BY SAID PLATE AND INCLUDING A WINDING DRUM ABOUT WHICH ONE END OF A LINE IS WOUND, STOP MEANS ON THE UPPER END OF SAID MAST ASSEMBLY PROJECTING REARWARDLY OF THE LATTER AND ADAPTED TO ENGAGE A PORTION OF THE BOW OF A BOAT ON SAID TRAILER, SAID STOP MEANS INCLUDING HORIZONTAL GUIDE MEANS UNDER WHICH THE REAR FREE END OF SAID LINE EXTENDS, SAID STOP AND GUIDE MEANS COMPRISING A PAIR OF LATERALLY SPACED SUPPORT ARMS SUPPORTED FROM AND PROJECTING REARWARDLY FROM THE UPPER PORTION OF SAID MAST ASSEMBLY, A STOP AND GUIDE ROLLER ROTATABLY SUPPORTED BETWEEN AND BY THE FREE ENDS OF SAID SUPPORT ARMS FOR ROTATION ABOUT AN AXIS EXTENDING BETWEEN SAID ARMS AND BEING POSITIONED IN ELEVATION RELATIVE TO SAID SUPPORT FRAME SO AS TO BE ADAPTED TO CLOSELY OVERLIE THE FORWARDLY PROJECTING BOW EYE OF A BOAT POSITIONED ON SAID TRAILER AND THE REAR FREE END OF SAID LINE PASSING BETWEEN SAID ARMS WHEN SAID LINE IS SECURED TO SAID BOW EYE IN TAUT CONDITION WHEREBY SAID STOP AND GUIDE MEANS WILL, IN ADDITION TO PREVENTING FORWARD MOVEMENT OF SAID BOAT, ALSO PREVENT ELEVATION OF THE BOW OF THE BOAT RELATIVE TO SAID FRAME.