Sliding door closure

Claim 1

A SLIDING DOOR CLOSURE COMPRISING: A HOUSING HAVING A FRONT WALL, A BACK WALL AND AT LEAST TWO OPPOSITE SIDE WALLS, EACH OF SAID SIDE WALLS HAVING AN OPENING THEREIN THROUGH WHICH A FLEXIBLE BAND MAY EXTEND; SAID HOUSING BEING FORMED OF TWO SECTIONS WITH ONE OF SAID SECTIONS INCLUDING SAID FRONT WALL AND THE OTHER OF SAID SECTIONS INCLUDING SAID BACK WALL AND MEANS DETACHABLY HOLDING SAID SECTIONS TOGETHER IN FIXED RELATIONSHIP; SAID FRONT WALL AND SAID BACK WALL HAVING ALIGNED OPENINGS THEREIN; A SHAFT ROTATABLY POSITIONED IN SAID OPENINGS; A REEL IN SAID HOUSING FREELY SURROUNDING SAID SHAFT; A COIL SPRING POSITIONED IN SAID REEL AND CONCENTRIC WITH SAID SHAFT, ONE END OF SAID SPRING BEING FIXED TO SAID SHAFT AND THE OTHER END OF SAID SPRING BEING FIXED TO SAID REEL THEREBY NORMALLY URGING SAID REEL IN ONE DIRECTION OF ROTATION; A FLEXIBLE BAND WOUND ON SAID REEL HAVING ONE END THEREOF FIXED TO SAID REEL AND THE OTHER END EXTENDING OUTSIDE SAID HOUSING THROUGH ONE OF SAID SIDE WALL OPENINGS FOR CONNECTION TO A SLIDING DOOR; MEANS FOR ADJUSTING THE TENSION OF SAID SPRING, SAID MEANS INCLUDING RATCHET MEANS FIXED TO SAID SHAFT AT THE FRONT WALL OF SAID HOUSING, A SINGLE PAWL AND MEANS PIVOTALLY MOUNTING SAID PAWL ON SAID FRONT WALL SO AS TO ENGAGE SAID RATCHET MEANS; SAID MEANS PIVOTALLY MOUNTING SAID PAWL ON SAID FRONT WALL BEING READILY REMOVABLY WHEREBY SAID PAWL MAY BE SELECTIVELY ASSEMBLED INTO TWO POSITIONS TO ENGAGE AND PREVENT ROTATION OF SAID RATCHET MEANS IN EITHER DIRECTION OF ROTATION THEREOF; AND SAID BIASING MEANS URGING SAID PAWL INTO ENGAGEMENT WITH SAID RATCHET MEANS REGARDLESS OF WHICH OF SAID TWO POSITIONS THE PAWL IS DISPOSED.