Tank type suction cleaner

Claim 1

IN A HORIZONTAL TANK-TYPE SUCTION CLEANER HAVING AN INLET AND OUTLET FOR AIR AT OPPOSITE ENDS THEREOF, MEANS COMPRISING A MOTOR-FAN UNIT DISPOSED LENGTHWISE OF THE CLEANER FOR CIRCULATING AIR THERETHROUGH, SAID UNIT INCLUDING A MOTOR AND A FAN DRIVEN THEREBY, SAID CLEANER COMPRISING AN ELONGATED CASING HAVING AN OPEN END, UNITARY SUPPORTING STRUCTURE COMPRISING FIRST, SECOND AND THIRD PARTS, SAID FIRST PART PROVIDING A TRANSVERSE WALL SUBSTANTIALLY NORMAL TO THE LONGITUDINAL AXIS OF SAID CASING AND HAVING A CROSS-SECTIONAL AREA SUBSTANTIALLY EQUAL TO THAT OF SAID CASING AT ITS OPEN END, THE CASING AT ITS OPEN END BEING MOUNTED ON SAID TRANSVERSE WALL, SAID SECOND PART PROJECTING LENGTHWISE OF THE CLEANER TOWARD THE INLET IN ONE DIRECTION FROM THE TRANSVERSE WALL, SAID SECOND PART BEING OF ANNULAR FORM AND OF SMALLER CROSS-SECTIONAL AREA THAN THAT OF SAID CASING AND BEING IN TELESCOPIC RELATION WITH SAID CASING AT ITS OPEN END, SAID THIRD PART PROJECTING LENGTHWISE OF THE CLEANER TOWARD THE OUTLET IN THE OTHER DIRECTION FROM THE TRANSVERSE WALL, SAID THIRD PART BEING