Cable winding apparatus for cable drums of sewer cleaning machines

Claim 1

SEWER CLEANING DRAG BUCKET HOIST APPARATUS COMPRISING: A CABLE-WINDING DRUM; A GUIDE FOR RECEIVING A STRETCH OF CABLE EXTENDING TANGENTIALLY FROM THE DRUM; A DOUBLE-HELIX SCROLL SHAFT ON WHICH SAID GUIDE IS MOUNTED FOR RECIPROCATING MOVEMENT IN RESPONSE TO ROTATION THEREOF; MEANS SUPPORTING SAID SCROLL SHAFT IN A POSITION PARALLEL TO THE AXIS OF SAID DRUM, SAID SUPPORTING MEANS BEING MOVABLE TRANVERSELY WITH REFERENCE TO A RADIUS OF SAID DRUM TO EFFECT SHIFTING MOVEMENTS OF SAID GUIDE SO AS TO FOLLOW MOVEMENTS OF SAID CABLE STRETCH CORRESPONDING TO CHANGES IN THE RADIAL DISTANCE FROM THE AXIS OF SAID DRUM TO THE POINT OF TANGENCY OF SAID CABLE STRETCH WITH THE CABLE-WOUND PERIPHERY OF THE DRUM IN ACCORDANCE WITH CHANGES IN THE AMOUNT OF CABLE WOUND UPON THE DRUM; AND MEANS TRANSMITTING ROTARY DRIVE FROM THE DRUM TO SAID SCROLL SHAFT TO ROTATE THE SAME IN TIMED RELATION TO DRUM ROTATION, SAID SCROLL SHAFT SUPPORTING MEANS BEING DISPOSED ABOVE SAID DRUM AND COMPRISING A SWING AND FIXED SUPPORTING PIVOT MEANS FROM WHICH SAID SWING IS FREE-HANGING, DEPENDING TOWARD THE DRUM WITH ITS LOWER PORTION CLEARING THE UPPER SIDE OF THE DRUM, SAID SCROLL SHAFT BEING MOUNTED IN SAID LOWER PORTION OF THE SWING.