Sliding shoe for a closure member

Claim 1

A SHOE FOR A SLIDING CLOSURE MEMBER INCLUDING, IN COMBINATION, AN ELONGATED BODY HAVING FIRST AND SECOND LATERALLY SPACED BEARING SURFACES, A BACKING ON SAID BODY SPACED BEHIND AND FACING TOWARD SAID FIRST BEARING SURFACE, AN ELONGATED SPRING BOWED INTERMEDIATE ITS ENDS WITH PORTIONS AT OPPOSITE ENDS OF THE BOW ENGAGING SAID BACKING BEHIND THE SPRING AND THE INTERMEDIATE PORTION OF THE BOW PROJECTING FORWARDLY BEYOND SAID FIRST BEARING SURFACE FOR ENGAGEMENT WITH A GUIDE RAIL, ABUTMENT MEANS ON SAID BODY ADJACENT ONE END OF SAID SPRING FOR HOLDING SAID ONE END AGAINST SAID BACKING AND RESISTING ENDWISE SLIDING OF THE SPRING TOWARD SAID ONE END WHILE PERMITTING SLIDING OF THE SPRING IN THE OPPOSITE DIRECTION, AND MEANS FOR HOLDING THE SPRING RELEASABLY AGAINST ENDWISE SLIDING IN THE OPPOSITE DIRECTION INCLUDING AN ABUTMENT SPACED LONGITUDINALLY ALONG SAID SPRING FORM SAID ABUTMENT MEANS AND ENGAGING THE FORWARD SIDE OF SAID SPRING BEYOND SAID BOW AT A POINT SPACED FROM THE OTHER END OF THE SPRING