Vacuum cleaning tool

Claim 1

A VACUUM LINE ATTACHMENT COMPRISING A HEAD; AN APRON EXTENDING DOWNWARDLY AND OUTWARDLY FROM AROUND THE OUTER PERIPHERY OF THE HEAD; MEANS CARRIED BY THE HEAD FOR ATTACHMENT TO A VACUUM LINE; A RESILIENT, ELASTIC OPEN CELL MEMBER EXTENDING COMPLETELY ACROSS AND FILLING THE SPACE BOUNDED BY SAID APRON AND CARRIED BY THE HEAD INSIDE OF AND FITTING AGAINST SAID APRON AROUND A LOWER PORTION AT LEAST THEREOF AND EXTENDING DOWNWARDLY BY A PORTION BELOW THE LOWER MARGIN OF SAID APRON; SAID HEAD HAVING AN AIR FLOW PASSAGEWAY FROM THE UPPER PORTION OF SAID OPEN CELL MEMBER ADAPTED TO COMMUNICATE WITH SAID VACUUM LINE; AND VALVE MEANS AROUND SAID APRON AT SIDES OF SAID OPEN CELL MEMBER, THE UPPER PORTION OF SAID CELL MEMBER BEING INTERPOSED BETWEEN SAID VALVE MEANS AND SAID PASSAGEWAY SO THAT AIR FLOW FROM THE VALVE MEANS TO SAID PASSAGEWAY MUST PASS THROUGH SAID CELL MEMBER, SAID VALVE MEANS OPENING UPON A PREDETERMINED DEGREE OF VACUUM BEING SET UP WITHIN SAID MEMBER AUTOMATICALLY PERMITTING ATMOSPHERIC AIR TO ENTER THE MEMBER; SAID VALVE MEANS BEING INTERMEDIATE SAID HEAD AND SAID APRON MARGIN.