US2327225A - Suction cleaning apparatus - Google Patents

Description

Aug. 17, 1943. c. H. TAYLOR SUCTION CLEANING APPARATUS Filed March 8 1941 INVENTOR CHAPLES H. 72H/o? BY F/G.. 7. ATTORNhY Patented Aug. 17, 1943 2,327,225 l sorIoN CLEANING APPARATUS Charles H. Taylor, Springfield, Mass., assignor to Westinghouse Electric & Manufacturing Company, East Pittsburgh, Pa., a corporation of Pennsylvania Application March 8, 1941, Serial No. 382,297 (criss- 51) 11 Claims.

This invention relates-to suction cleaners and more particularly to an air ilter or dust bag therefor.

An object of this invention is to provide an improved dust bag for suction cleaners A further object is to provide an economical, efficient, land ornamental dust bag for suction cleaners.

Another object is to provide a dust bag that will permit the escape of air and the desired accumulation of dust and the like taken up by the cleaner without the contamination of the surrounding air in the room in which the cleaner is used.

A further object is to provide a paper iiltering element of simple form that requires no preforming and may be readily discarded and replaced at low cost.V y

These and other objects are effected by my invention as will be apparent from the following description and claimsV taken in connection with the accompanying drawing, forming a part of this application, in which:

Fig. 1 is a perspective View of a suction cleaner having an air-filtering device or dust bag constructed according to this invention in position thereon; Y

Fig. 2 is a longitudinal section of the air-filtering device shown in Fig. 1;

Fig. 3 is a sectional View showing the inner and outer elements of the air-iiltering'device shown in Fig. 1 in extended position for the insertion or removal of the intermediate air filtering element;

Fig. 4 is a fragmentary section taken along line IV-IV oi Fig. 1;

Fig. 5 is a vsection taken along line V-V of Fig. 3; and

Figs, 6 and 'l are side and end views, respectively, of the intermediate filter element.

,Referring to the drawing in detail, in Fig. 1, a conventional suction rcleaner I2 including a casing l5 having an exhaust outlet Il extending therefrom is shown for the purpose ofy illustrating this invention. An air-filtering device I0, such as commonly referred to in the art as a dust bag, constructed according to this invention is shown connected to the exhaust outletk Il of the cleaner. A pivoted handle I3 is provided for moving the cleaner over the surface to be cleaned. The upper end of the handle i3 is'adapted to support the upper end of the ltering device l by means of a spring I4 or other equivalent ilexible element. A cord l is provided for connecting the cleaner motor to a suitable'source of power.

The air-filtering device or dust bag lll comprises an inner bag or lining i8 of coarse mesh cloth, an outer bag or cover I9 of decorative cloth, and an intermediate fine filter element 20 of paper or other suitable ltering material. The inner bag I8 and the outer bag I9 are stitched together at their ends as shown at 2l and 29 and they terminate at their lower ends in convergent necks 22 which are attached by means of a spring wire loop 23 to a collar 213V. The collar 24 is provided with bayonet Slots 25 by means of which the filter I 0 is connected to the exhaust outlet Il of the cleaner. The outer bag I9 is cut transversely near its lower end, as indicated at 26, to provide a main portion 21 and a small portion 28, to which the main portion 21 is fastened bymeans of a hookless fastening device '32,such as that commonly known as a zippen The intermediate fine filter element Z'is tubular in form and is made of paper or some other suitable ltering material. It is provided by cutting oif the proper length of a paper cylinder or it may be fabricated from sheet paper, Thiselement is positioned between the inner bag |81 and Y the outer bag I9. Its lower end is folded as shown at 3| so that it conforms nicely to the shape of the necks 22 of the inner and outer bags. The upper end of the assembled dust bag lll is closed as shown in Figs. 1 and 4 by a clamp 34. The ends of the intermediate iilter element 20 t snugly against the ends of the compartment between the inner bag I8 vand outer bag i9 as shown in Fig. 2. This snug t prevents air and dust fromY escaping past the ends of the intermediate lter element, thereby forcing all the air clischarged from the exhaust il of the cleaner to pass through the sides of the intermediate filter element 20. If desired, the small portion 23 of the outer bag may be made of a material that is impervious to air and dust to insure that no dust escapes past the lower end of the element 253.

To insert or rem-ove Vthe intermediate ilter element, the hookless fastener 32 is unfastened and the main portion 21 of the outer bag i9 and the inner bag I8 are extended, substantially longitudinally of each other as shown in Fig. 3. The intermediate filter element El! is then slipped over the portion 2'( of the outer bag I9 and positionedV ar-oundthe inner bag I8 and the lowei1 portion of the filter element `is folded as at 3l to conform nicely tothe shape of the necks22 or the outer and inner bags. lThen the main portion 21 of the outer bag I9 is pulled down over the filter element 20 and the hookless fastener fastened, as shown in Fig. 2.

The inner bag IB is constructed of coarse mesh fabric such as ordinarily used for dust bags for suction cleaners. This material is impervious to large dust particles but pervious to air, and from experience it is known that this material is also pervious to Very fine dust particles and pollen entrained in the air discharged from the exhaust ci the cleaner. To prevent discharging this iine dust and pollen back into the room being cleaned to contaminate the air therein, the intermediate fine filter 2E) is provided to further filter the air after it has passed through the inner bag i5. This intermediate filter is pervious to air but highly impervious to fine dust and pollen. Some of the fine dust and pollen that passes through the inner bag I8 is retained on the side of the. fine filter 2) and some of it falls down in the neck 22 between the inner bag and the ne filter 7.0. The outer'bag I9 serves primarily to retain the intermediate filter 20 in position and it may be made of a decorative material which is pleasing to the eye. rThis material may be coarse meshed and may incidentally filter someV dust n from the air passing through the same, but its primary function is to hold the intermediate filter element 'ti in position between Vthe inner and outer bags.

To ern-pty the filtering device or dust bag id, it is first removed from the cleaner i2, the clamp Si is removed and the bag is turnedupside down and shaken to remove the dust and litter collected in the inner bag I8. t is not necessary to remove the intermediate filter element v2@ each time the bag is cleaned. For instance, if it is cleaned. every week or so there will be insuifcient dust collected by the intermediate lter 2t to justify such frequent cleanings of the same. However, if vthe dust bag has been used long enough so that the intermediate filter needs replacing or cleaning, this is done by first emptying the dirt from the inner bag las described above. Then the inner bag i3 and the main portion 2 of the outer bag iii-are extendedy as shown in Fig. 3 and the intermediate filter element 28 is slipped over the main portion 27 of the outer bag IS. After the intermediate filter element 2t has been removed, the bags are violently shaken to remove any dirt that may be deposited on the outside of the inner bag i8 and on the inside of the outer bag i9. The soiled intermediate iilter element 2t may be destroyed and replaced with a new element at a low cost.

An advantage 0f this filtering device is that because of the fact that the intermediate filter- ;ing element E@ is made from a straight cylindrical tube that requires no preforming, gluing, or stitching before it is adapted to beused to lter the air exhausted from a suction cleaner, a high grade air filter can be produced a., a very low cost.

A further advantage of this filtering device, is that because of the low cost of the intermediate filter 2i) it may be frequently replaced Without any appreciable financial outlay by the owner, thus enabling the owner to maintain a more eiiioient filter at a minimum cost.

From the foregoing description taken in connection with the drawing, it will .bel seen that this v invention has provided an improved air-filtering device for suction cleaners which is eiiicient, economical and ornamental.

While I have shown my invention in but one form, it will be obvious to those skilled in the art Vouter fabric bag that is porvicus to an.

that it is not so limited, but is susceptible of various changes and modifications without departing from the spirit thereof, and I desire, therefore, that only such limitations shall be placed thereupon as are specifically set forth in the appended claims.

What l claim is:

l. An air-filtering device for suction cleaners, said ltering device including inner and outer cloth bags attached to a collar at one end and secured by a clamp at the other end, and a tubular paper filter element held between said inner and outer bags and adapted to be readily removed.

2. An air-filtering device for suction cleaners, said filtering device including an inner filter of coarse fabric that is pervious to air but impervious to coarse dust, an intermediate paper filter element that is pervious to air but impervious to fine dust particles entrained in the air being nltered, and an outer lter element of fabric that is pervious to air.

An air-filtering device for suction cleaners, said filtering device including an inner bag of coarse fabric that is pervious to air 'and impervious to coarse dust, an outer bag c-f fabric that is pervious to air, said inner and outer bags being permanently connected, and 'an intermediate filter element of paper that is pervious to air but impervious to fine dust particles, said intermediate filter element being readily removable.

e. An elongated air-filtering device for suction cleaners having a neck at one end adapted to be attached to the exhaust outlet of a suction cleaner and having an opening in the other end for cleaning the same, said opening being closab-le by a clamp; said filtering device including an inner filtering element of coarse mesh fabric that is pervious to air but impervious to coarse dust, an outer element that is pervious to air, and an intermediate tubular filtering element, said intermediate filtering element being pervicus to air but impervious to fine dust particles entrained in the air being filtered.

5. An air-ltering device for suction cleaners, said filtering device including an inner bag of coarse fabric that is pervious to air, an intermediate lter element of paper that is pervious to air but impervious to fine dust particles entrained in the air being filtered, said intermediate filter element being tubular and open at both ends, and an outer bag of fabric that is pervious to air.

6. An air-filtering device for suction cleaners including an inner bag of fabric that is impervious to coarse dust but pervious to air, an outer bag of fabric that is pervious to air, said inner and outer bags having converging necks which are attached to the exhaust outlet of the suction cleaner', and an intermediate tubular filter element, of paper thatis pervious to air but impervious to fine dust and pollen entrained in the air being filtered, said intermediate filter eieinent being folded adjacent one end to conform to the shape of the converging necks of the inner and outer bags.

y'i'. An air-filtering device for suction cleaners including an inner bag of coarse fabric that is impervious to coarse dust but pervious t air, an and a tubular paper filtering element that is impervious to fine dust and pollen entrained in the air being filtered but pervious to air positioned between said inner and outer bags, said inner and outer bags being attached together adjacent one end, and said bags being extensible end to end so that said Vtube-.lar filtering element may be removed or placed in position between said inner and outer bags.

8. An air-filtering device for suction cleaners y their ends, an open-ended tubular paper filtering element that is pervious to air but impervious to iine dust particles and pollen entrained in the air being iiltered positioned between said inner and outer bags, said outer bag being severed near one end thereof and a releasable fastening device provided for fastening the two parts thereof together when the filtering device is assembled for use, said rele'asable fastening device permitting a portion of said outer bag to be extended substantially longitudinally of said inner bag so as to permit thevinsertion of said tubular filtering element between said inner and outer bags.

9. An air-ltering device for suction cleaners including an inner fabric bag that is impervious to coarse dust but pervious to air, an outer fabric bag that is pervious to air, said inner and outer bags being attached together adjacent their ends, an open-ended tubular paper iilteringelement that is pervious to air but impervious to fine dust particles and pollen entrained in the air being ltered positioned between said inner and outer bags, the open ends o-f said tubular iilter tting snugly against the ends of the enclosure between the inner and outer bags,l thereby preventing iine dust and pollen from escaping past the ends of said tubular filter when said filtering device is in use.

10. An air-filtering device for suction cleaners including an inner fabric bag having a neck, said inner bag being pervious to air but impervious to coarse dust, an outer fabric bag having a neck conforming to the shape of the neck of said inner bag, said inner and outer bags being fastened together near their ends, a collar connected to the necks of said inner and outer bags for vattaching said filtering device to the exhaust outlet of a suction cleaner, an open-ended substantially cylindrical paper filter element that is pervious to air but impervious to iine dust and pollen positioned between said inner and outer bags, said paper filter element being folded so as to conform nicely to the shape of the necks on said inner and outer bags.

11. An air iiltering device for a suction cleaner comprising an inner air-pervious bag, an outer air-pervious bag, means for securing the inlet ends of said bags to the exhaust end of said suction cleaner, means for securing the opposite ends of said bags together, and an intermediate open-ended lter substantially coextensive with and disposed between said inner and said outer

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