Door closer

Claim 1

A CLOSER FOR A SLIDING DOOR ARRANGED IN AN ELONGATE FRAME INCLUDING, A HOUSING FIXED TO THE EXTERIOR OF THE FRAME AT ONE END THEREOF, A PAIR OF LATERALLY INWARDLY EXTENDING GUIDE TUBES CARRIED BY THE HOUSING AND PROJECTING THROUGH THE FRAME TO ESTABLISH COMMUNICATION BETWEEN THE INTERIOR OF THE FRAME AND THE HOUSING, A REVERSIBLE ELECTRIC MOTOR MOUNTED WITHIN THE HOUSING, A DRIVEN PULLEY WITHIN THE HOUSING AND DRIVEN BY THE MOTOR, AN IDLER PULLEY CARRIED BY THE FRAME REMOTE FROM THE HOUSING, AN ENDLESS TOW-LINE ENGAGED ABOUT SAID PULLEYS, THROUGH THE GUIDE TUBES AND FIXED TO THE DOOR, AND ELECTRICAL CONTROL MEANS FOR THE MOTOR INCLUDING A MANUALLY OPERABLE STARTER SWITCH ACCESSIBLE AT THE EXTERIOR OF THE HOUSING AND FRAME AND TO START THE MOTOR AND TO MOVE THE DOOR FROM ITS CLOSED TO ITS OPEN POSITION, A REVERSING SWITCH IN THE HOUSING TO REVERSE THE MOTOR WHEN THE DOOR REACHES ITS OPEN POSITION, A STOP SWITCH IN THE HOUSING TO STOP THE MOTOR WHEN THE DOOR IS CLOSED, AND OPERATING MEANS FOR THE REVERSING AND STOP SWITCHES INCLUDING A TUBULAR SLIDE SLIDABLY ENGAGED IN AND PROJECTING FROM THE OPPOSITE END OF EACH GUIDE TUBE, AN OPERATING ARM FIXED TO THE INNER END OF SAID SLIDE AND OPERATIVELY RELATED TO ONE OF SAID SWITCHES, AND A PAIR OF STOPS FIXED TO THE TOW-LINE, ONE STOP TO ENGAGE AND SHIFT THE SLIDE RELATED TO THE REVERSING SWITCH INWARDLY WHEN THE DOOR REACHES ITS OPEN POSITION AND TO ACTUATE THE REVERSING SWITCH, THE OTHER STOP TO ENGAGE AND SHIFT THE SLIDE RELATED TO THE STOP SWITCH INWARDLY WHEN THE DOOR RETURNS TO ITS CLOSED POSITION AND TO ACTUATE THE STOP SWITCH.