GB455715A - Improvements in or relating to suction cleaners - Google Patents

Abstract

455,715. Silencing vacuum cleaners. HOOVER, Ltd., Greenford, Middlesex.-(Assignees of Smellie, D. G.) March 26, 1935, No. 9448. Convention date, May 24, 1934. [Class 8 (i)] [See also Group XXVII] In a suction cleaner adapted to be moved over the floor by a handle to which the upper end of the dust bag is connected, and having a muffler through which the air passes from the fan into the dust bag, the muffler is movable with the handle. A suction cleaner comprises, Fig. 1, a nozzle A, supporting wheels B and a fan chamber C containing a fan driven by an electric motor mounted with its axis transverse to the direction of movement ; the fan and motor casing pivot with respect to the nozzle about the axis of the fan. A handle D is rigidly connected to the fan casing so that the casing and handle pivot together as a unit with respect to the nozzle, in the manner set forth in Specification 412,894. The muffler comprises, Fig. 3, an outer tubular sheet metal member F<1> and a perforated inner tubular sheet metal member F<2> having between them sound deadening material F<3> such as felt. The tubes are secured to a flanged sleeve G affixed by screws H to the fan exhaust outlet C<2>. The lower end of the dust bag E surrounds the tube Fl and is secured to the sleeve G; the upper end of the dust bag E is closed by a clip E<1> suspended by a spring E<2> from the handle D. The upper end of the muffler is provided with a non-return valve J of fabric or the like ; when the cleaner is switched off, the valve collapses and prevents dust from returning into the muffler. In a modification, Fig. 6, the muffler is permanently connected to the fan exhaust outlet C<2>, and its upper end has projecting rivets F<4> which engage bayonet grooves K<2> in the metallic mouth K<1> of the dust bag which has a portion extending below the mouth and provided with clips K<3> for securing it to the exhaust outlet C<2>. In a further modification the portion of the dust bag extending below the mouth completely surrounds the muffler, the lower end of the bag being secured to a flanged ring co-operating with the flange on the exhaust outlet of the fan casing, said flange being provided with openings to allow the passage of air passing through the inner wall of the dust bag. The muffler may comprise a flared -tube lined with felt-faced sponge rubber. The Specification as open to inspection under Sect. 91 describes a muffler having an opening in its underside to permit the escape of dust particles which are too heavy to be carried through and clear of the muffler, so as to prevent the accumulation of such particles in the muffler; baffles extend transversely across the opening, and outside the opening a hood is provided sc that the muffing properties are not interfered with. This subject-matter does not appear in the Specification as accepted.