Removable trailer chassis for boats and the like

Claim 1

IN COMBINATION WITH A TRAILER, A SUBSTANTIALLY HORIZONTALLY EXTENDING CYLINDRICAL TUBULAR MEMBER MOUNTED ON A SIDE WALL OF SAID TRAILER AND DISPOSED WHOLLY WITHIN THE INTERIOR OF SAID TRAILER, SAID TUBULAR MEMBER HAVING AN INNER END WALL AND AN OUTER OPENING PROVIDING ACCESS FROM THE EXTERIOR OF SAID TRAILER, A STUB SHAFT REMOVABLY JOURNALED IN SAID TUBULAR MEMBER FOR ROTATION ABOUT ITS AXIS AND HAVING A RADIALLY ENLARGED PORTION DISPOSED EXTERIORLY OF SAID TUBULAR MEMBER, SAID ENLARGED SHAFT PORTION HAVING AN ANNULAR SHOULDER DISPOSED IN ABUTTING RELATIONSHIP WITH THE OUTER END OF SAID TUBULAR MEMBER TO LIMIT AXIALLY INWARD MOVEMENT OF SAID SHAFT, A WHEEL SUPPORT ARM HAVING ONE END SECURED ADJACENT THE OUTER END OF SAID SHAFT AND DISPOSED GENERALLY TRANSVERSELY THERETO, A WHEEL MOUNTED FOR ROTATION ON THE OTHER END OF SAID ARM, A HELICAL SPRING DISPOSED CONCENTRICALLY ABOUT SAID SHAFT PORTION, A STOP MEMBER MOUNTED ADJACENT SAID SIDE WALL SUBSTANTIALLY FLUSH WITH THE EXTERIOR SURFACE THEREOF AND DEFINING A GENERALLY ARCUATE SHAPED RECESS IN SAID SIDE WALL SAID RECESS EXTENDING ALONG A GENERALLY CIRCULAR CENTERLINE DISPOSED CONCENTRICALLY ABOUT SAID TUBULAR MEMBER AND IN END ALIGNMENT WITH SAID SPRING, SAID STOP MEMBER INCLUDING AN END WALL DISPOSED TRANSVERSELY ADJACENT ONE END OF SAID RECESS AND A SUBSTANTIALLY RADIALLY EXTENDING WALL DISPOSED OVER A SEGMENT OF SAID RECESS ADJACENT SAID END WALL, SAID STOP MEMBER BEING ADAPTED TO HAVE THE INNERMOST END PORTION OF SAID SPRING INSERTED INTO SAID RECESS IN ABUTTING RELATIONSHIP WITH SAID END WALL AND RESTRAINED THEREBY AGAINST ROTATION IN ONE DIRECTION ABOUT SAID SHAFT, SAID RADIALLY EXTENDING WALL RESTRAINING SAID INNERMOST SPRING PORTION AGAINST AXIALLY OUTWARD MOVEMENT RELATIVE TO SAID TRAILER, AND SAID SPRING HAVING A PORTION ADJACENT ITS OUTERMOST END ENGAGING SAID SUPPORT ARM FOR RESTRAINING SAID SPRING AGAINST ROTATION IN THE OTHER DIRECTION ABOUT SAID SHAFT AND RESTRAINING SAID SHAFT AGAINST AXIALLY OUTWARD MOVEMENT RELATIVE TO SAID TRAILER, SAID SHAFT THEREBY BEING RESILIENTLY RESTRAINED AGAINST ROTATIONAL MOVEMENT IN ONE DIRECTION.