FR2515952A1 - ANTI-RETURN CHAMBER FOR A FILTERING SLEEVE, ESPECIALLY EQUIPPED WITH A BROOM-TYPE DUST VACUUM - Google Patents

Abstract

THE INVENTION CONCERNS A NON-RETURN SHUTTER FOR A FILTRATION SLEEVE, EQUIPPING IN PARTICULAR A DUST VACUUM OF THE BRUSH TYPE. THE SHEET 1, MADE OF AN ELASTIC MATERIAL, IS FIXED ON THE FILTRATION SLEEVE 6 OF A DUST VACUUM. A THINNED PART 2 FORMING A HINGE DIVIDES THIS SECTION 1 INTO TWO REGIONS, ONE OF WHICH IS FOR ITS FIXING AND THE OTHER IS EQUIPPED WITH A PERIPHERAL BUMPER 5. APPLICATION IN PARTICULAR TO BRUSH-TYPE VACUUMS.

Description

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  The present invention relates to a non-return flap which, made of an elastic material such as

  rubber or similar material, equips the thread sleeve with

  tration, placed vertically, dust cleaners, especially the brush type, and is fixed on this filter sleeve. There are non-return flaps consisting of die-cut rubber plates These plates are attached on one side to the filter sleeve.

  However, they have the disadvantage of bending over

  even in the presence of heavy dirt, and thus to penetrate

  by pressure inside the sleeve Their function of

therefore not guaranteed.

  In addition, there are known non-return flaps which

  are directly injection molded onto the suction sleeve

  They consist of a plastic material such as polyethylene or similar substance. Of course, they are protected from bending, but have the disadvantage of being very rigid at their point of rotation.

  never close completely, so that

  core, a seal is not guaranteed -

  The present invention therefore has as its object

  to make a non-return flap whose shape is sufficient

  Stable enough so that it is not bent by heavy dirt, and is sufficiently elastic at its point of rotation to close always satisfactorily

  and thus ensure a good seal.

  According to the essential features of the invention, the non-return flap has a thinned portion which, forming a hinge, subdivides this flap into two regions, one of which serves for fixing and the other is provided with a

peripheral bead.

  The invention thus has the decisive advantage of allowing in a simple manner the realization of a non-return flap which, on the one hand, is stable enough not to be cranked by heavy dirt and, secondly, either sufficiently elastic at its point of rotation for

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  always ensure a good seal of the filter sleeve

  tion. The invention will now be described more in

  detail with reference to the annexed drawing as a null example

restrictive and on which

  FIG. 1 is a section of a thread sleeve

  tration equipped with a non-return flap; and

  FIG. 2 is a plan view of a shutter

return according to Figure 1.

  During suction, a filter sleeve 6 shown in FIG. 1 lets in the dust-laden air, which flows in the direction of the arrow and which is then collected by a bag 7 filtering the dust and

  disposed on said filter sleeve 6.

  On this filter sleeve 6, is further placed a non-return flap 1 intended to prevent the dust in the filter bag 7 from falling back. This flap 1 is hooked on a support 8 secured to the sleeve 6, by means of a opening 9 During suction, it thus takes the position shown in dashed portion A thinned portion 2 forming a hinge is in this case an elastic point-state-ionrLo-rsque the lapaincse e-oe ue 4 r 1 takes its illustrated position in full lines and, thanks

  to a peripheral bead 5, it presents in this posi-

  sufficient resistance to bending, so that

  can not be introduced by pressure inside the man-

  The bead 5 runs along the periphery to provide sufficient resistance to the bending and, moreover, to ensure that the shutter 1 is not

  not too heavy so that the air can not lift it anymore.

  Figure 2 is a plan view of the non-return flap 1 The thinned portion 2 forming a hinge subdivides this flap into regions 3 and 4 The opening 9 is made in region 3 for fixing and the region

  4 has the bead 5 providing reinforcement.

  It goes without saying that many modifications

  can be made to the non-return flap described and

  felt, without departing from the scope of the invention.

Claims (1)

CLAIM   Non-return flap made of an elastic material   such as a rubber or a similar material   the filter sleeve, arranged vertically,   dust collectors, in particular vacuum cleaners of the brush type, this flap being attached to said filter sleeve and being characterized in that said flap (1) comprises   a thinned portion (2) forming a hinge and subdividing the   said shutter (1) in two regions (3, 4), one (3) of these regions serving for fixation and the other region (4) being provided with a peripheral bead (5).