US2308310A - Filter bag attaching means for dust arresting apparatus - Google Patents

Description

Jan. i2, 1943. R. RUEMELIN, JR., ETAL 2,303,310

. .i FILTER BAG TTACHING MEANS FOR DUST ARRESTING APPARATUS Filed May 7, 1942l www INVENTOR. i

BY /K K v 'ATTO RNEYg.. t

Patented Jan. 12, 1943 FILTER BAG ATTACHING MEANS FR DUST ARRESTING APPARATUS Richard Ruemelin, Jr., and Owen H. Harris, Milwaukee, Wis., assignors to Richard Ruemelin,

Milwaukee, Wis.

Application May 7, 1942, Serial No. 442,108

8 Claims.

This invention relates to improvements in lter bag attaching means for dust arresting apparatus. Y

Dust arresting devices as commonly constructed include a collecting box into which the dustladen air is blown, and a plurality of lter bags having their lower ends communicating with openings in the top wall of said box. During use, the heavy particles of matter in the air readily settle in the collector box, and the finer particles of dust pass up into the lter bags and are deposited on the inner side of the cloth. This dust within the bags is periodically shaken down into the collector box, usually by a mechanical shaking device.

It has, heretofore, been common practice to clamp the lower ends of the lter bags around collars which surround the top openings in the collector box and which project upwardly therefrom, and these collars, being numerous and close together, render the task of cleaning the top side of the collector box very diicult. The spaces between collars are narrow and relatively inaccessible, and the dust can not be swept into the collector box openings because the collars interfere. This clamping method also renders the task of removing the bags relatively difficult. In addition, the formation of the top wall of the collector box with collars materially increases the expense of manufacture.

It is, therefore, one of the objects of the present invention to provide in a dust arresting apparatus, improved means for readily removably connecting the lower ends of the filter bags to the openings in the top wall of the collector box, said means eliminating the necessity of having upwardly projecting collars on the collector box, eliminating the necessity of clamps, reducing manufacturing costs, and rendering the openings ush with the top wall of the collector box whereby dust on said wall may be quickly swept into the openings when the lower ends of the bags are disconnected.

A further object of the invention is to provide lter bag attaching means whereinthe cloth of the filter bags is maintained out of contact with the-marginal edges of the openings of the collector box so that the possibility of frictional wear on the lower ends of the bags is eliminated. In prior attempts to improve upon the methods of attaching lter bags, a resilient metal band has been sewed within a loop formed on the lower end of a filter bag. This, however, caused the cloth of the filter bag to be pulled against the marginal edge of the opening and whenever the filter bag wasl agitated there would be friction of y the metal against the cloth. Wear would eventually result with consequent leakage and escape of dust.

A further object of the invention is to provide for use in apparatus having a horizontal `wall formed with openings therein, preformed tubular members of rubber or the like connected to the lower ends of the lter bags, each member having at least one external bead formed of the same Imaterial as the member itself `andengageable with the material forming the marginal edge of the opening to removably connect the lower end of the lter bag in registration with the opening while providing for a tight seal, or each member having an external annular groove for reception of said marginal edge.

A more specic object of the invention is to provide a construction as above described Wherein the external annular groove of the preformed tubular member is preferably formed between spaced external b-eads, saidrbeads being engageableabove and below the material forming the marginal'edge of an opening and preventing vertical movement of the lter bag in both directions while at the same time forming an effective seal.

A further object of the'invention is to provide an attachment member for connection with the lower end of a lter bag wherein the member is formed of rubber which is sufficiently stiff to normally maintain itself in circular form but which may nevertheless 'be' deformed to permit disengagement of the integral beads or annular groove on the member from the edge of an opening in the collector box.

With the above and other objects in View, the invention consists of the improved lter bag attachment means, and all its parts and combinations as set forth in the claims, and all equivalents thereof. l

` In the accompanying drawingillustrating -preferred embodiments of the invention, in which the same reference numerals designate the same parts in all of the views,

Fig. l is a side View of a portion of a dust arrester showing a series of lter bags extending upwardly from a dust collector box;

Fig. 2` is a fragmentary View on an enlarged scale showing the lower end of a filter bag connected to a collector box opening, part of the lower end of the filter bag and attaching means being broken away and shown in section;

Fig. 3 is a perspective view of one of the improved attachingmembers alone;

Fig. 4 is a fragmentary vertical sectional view showing the attaching member and a portion of a filter bag and illustrating a modification; and

Figs. 5 and 6 and views similar to Fig. 4 illustrating additional modifications.

Referring more particularly to the drawing, the numeral 8 designates tubular filter bags formed of suitable textile material, specially woven for use in dust arresters. A multiplicity of such bags are usually employed and arranged in rows extending in two directions. The lower ends of the filter bags are connected in registration with openings 9 formed in the top wall of a collector box I0. The upper ends of the bags are connected by hooks I I with horizontal frame members I2. During operation of the dust arrester reciprocating motion is applied to the frames I2, by use of any suitable mechanism, to shake the upper en ds of the filter bags. This causes ne particles of dust which have been deposited on the inner walls of the filter bags to fall back into the collector box IQ, it being understood that in this type of device the dustladen air is blown into the collector box with the heavier particles being immediately deposited in said box and with the lighter particles being carried up into the filter bags and being deposited on the inner walls thereof while the air passes through the material of the bags.

Heretofore it has been common practice to form the upper wall I3 of the collector box with upstanding collars surrounding the openings 9 and to clamp the lower ends of the lter bags around said collars. After a substantial period of use a relatively large amount of dust is deposited on the top wall I3 of the filter box ex- `teriorly of the filter bag. Where collars were the filter bag and to have this band expand beneath the marginal edge of an opening such as the opening 9. This type of arrangement did not prevent downward shifting movement of the filter bag and, furthermore, there was wear on the cloth adjacent the edge of the opening, which eventually resulted in leakage.

With the present invention no collars are employed, and when it is necessary to clean the top wall I3 of the collector box the lower ends a tubular attachment member I 4 which is formed of rubber or like material. The rubber has sufficient stiffness to normally maintain itself in the circular form, but is nevertheless sufliciently flexible to permit deformation for the purpose of disconnecting the member from one of the openings 9.

The tubular attachment member I4 has its upper portion I5 in the form of a collar of unipress tightly against the metal edge 21.

form thickness from the top to the point I6. This collar is connected by stitching I 'I and I8 with the lower end of the filter bag. In the form of connection shown in Fig. 2 the lower end of the bag is doubled back to provide double thick ness where the stitching occurs. In the arrangement of Fig. 4 the material at the lower end of the bag is not only doubled back but also downwardly on the outside of the collar portion I5, as at I9. Various other methods of connecting the lower end of the bag to the collar portion I5 may be employed.

From the point I6 down, the material of the attachment member I4 is' of increased thickness, and there is an internal taper 2D extending from the part of maximum thickness to the collar part I5. On the outside the material angles outwardly as at 2| to merge with a top bead 22. Spaced below the top bead 22 is a bottom bead 23, there being a groove 24 therebetween. The beads 22 and 23 are preferably hollowed out, as at 25 and 26. While the use of beads is preferred, the groove 24 may be formed in a thickened lower portionV without definite bead formations.

In use, the attachment member I4 is'manually deformed to permit insertion of the lower bead 23 through the opening 9. The beads are then permitted to expand, with the result that the marginal edge 21 of the opening is received within the groove 24. The diameter at the inner portion of the groove 24, as at 28, is slightly greater than the diameter of the hole 9, so that when the attachment member I4 springs back to normal condition the inner portion 28 of the groove will In addition the spacing at 24 (Fig. 4) is normally slightly less than the thickness of the metal I3 so that when the member is in the operative position of Fig. 2 the beads tend to press tightly against the upper and lower surfaces of the wall I3. Thus there is a three-point seal.

The attachment member I4 is preferably preformed with the groove 23 and with the beads thereon. It is preferably made by an extruding l process wherein the cross-sectional contour is formed in an elongated strip. The strip'is then cut 0E in desired lengths and the ends'of each length are vulcanized together, as at 29, lto form rings of the desired diameter. It is also possible to mold the members of Fig. 3 in final shape and size without the seams 29.

While in the preferred form of the invention it is preferred to have a lower bead 23 and an upper bead 22, it is obvious that the upper bead or both beads may be omitted as far as the broader aspects of the invention are concerned. The broad aspect of the invention comprises formation of attachment members with an annular groove 24 or slit or with one or more preformed beads from material such as rubber which can be readily deformed but which nevertheless maintains itself in the assembled position in such a way as to provide an effective seal.

The attachment of these members to the lower ends of the bags is a simple operation which can be carried out on a sewing machine, and the thread I'I and i8 passing through the relatively tough rubber at I5 provides for a strong connection. Furthermore by having the lupstanding collar i 5, the material of the filter bags 8 does not come in contact with the marginal edge 21 of the opening 9. Thus there is rno wear `on the filter bag cloth. All wear will be within the groove 24 formed of rubber, and this rubber is capable of withstanding the minor amount of frictional wear to which it is subjected for an indefinite period.

In the modifications of Figs. 5 and 6 the rings may be formed with projecting rubber collar portions I5 and l5 respectively which are of the same thickness as the portion therebelow and there are external annular slits or grooves 2li and 24" respectively corresponding in function to the grooves Zfi of the form of Fig. 2. In the form of Fig. 5 the lower edge of the fabric is vulcanized to an annular portion of the rubber ring on either the inside as at 30, or on the outside. In the form of invention of Fig. 6 the lower end of the lter bag 8 is formed with a loop 3|. A cord or other reinforcement 32 within the loop provides a circular enlargement which may be pressed into a yielding external annular groove 33 in the rubber collar and into a communicating circular enlargement 34 of the groove. Thus the lower end of the filter bag may be detachably connected to the collar.

Various other changes and modications may be made without departing from the spirit of the invention, and all of such changes are contemplated as may come within the scope of the claims.

What we claim is:

l. Attachment means for connecting an end of a tubular filter bag to a receptacle having an opening comprising, a tubular member formed of rubber, there being an external preformed groove in said member for reception of the marginal edge of said opening to form a yielding seal between said member and said marginal edge when said member is in normal condition, said member being disengageable from said marginal edge by manual compression of the rubber, and said member having a tubular portion of rubber projecting above the opening for connection with the lower end of the filter bag.

2. Attachment means for connecting an end of a tubular filter bag to a receptacle having an opening comprising, a tubular member formed of rubber, an external annular bead formed integral with said member having a periphery of greater normal diameter than the diameter of the opening for engagement below the marginal edge of said opening to form a yielding seal between said member and said marginal edge when said member is in normal condition, said member being disengageable from said marginal edge by manual deformation of the member and bead, and said member having a tubular rubber portion projecting above the opening for connection with the lower end of the lter bag.

3. Attachment means for connecting an end of a tubular filter bag to a receptacle having an opening comprising, a tubular member formed of yieldingly deformable material and having two preformed external annular beads formed integral with said member, one above theother in longitudinally spaced relation, said beads having an external periphery which is normally of greater diameter than the diameter of the opening in the receptacle, and said beads and member being deformable to permit insertion of the lower bead through said opening, and said tubular member having a tubular portion for connection with the lower end of the filter bag, whereby the lower end of said bag may be removably connected to the receptacle in registration with the opening, with onebead below and one bead above the material forming the marginal edge of said opening to positively prevent movement of the secured end of the bag in either longitudinal direction while so attached.

4. As a new article of manufacture, an attachment member for connecting an end of a tubular filter bag to a receptacle having an opening comprising, a rubber ring having integral attaching means for yielding engagement with the marginal edge of the opening and having an integral upstanding portion for connection with the lower end of the filter bag.

5. As a new article of manufacture, an attachment member for connecting an end of a tubular filter bag to a receptacle having an opening comprising, a rubber ring having an external annular groove for the reception of the marginal edge of the opening and having an integral upstanding portion for connection with the lower end of the lter bag.

6. As a new article of manufacture, an attachment member for connecting an end of a tubular lter bag to a receptacle having an opening comprising, a ring of yieldingly deformable material having an external annular groove for the reception of the marginal edge of the opening and having an annular portion for connection with the lower end of the filter bag.

'7. As a new article of manufacture, an attachment member for connecting a reinforced end of a tubular filter bag to a receptacle having an opening comprising, a rubber ring having integral attaching means for yielding engagement with the marginal edge of the opening and having an upstanding portion formed with an annular groove having yielding walls for detachably receiving the reinforced lower end of the bag.

8. Attachment means for connecting an end of a tubular filter bag to a receptacle having an opening` comprising, a tubular member formed of yieldingly deformable material, there being an external preformed groove in said member for reception of the marginal edge of said opening to form a yielding seal between said member and said marginal edge when said member is in normal condition, said member being disengageable from said marginal edge by manual compression of the tubular member, and said member having a tubular portion for connection with the lower end of the filter bag.

RICHARD RUEMELIN, JR.

OWEN H. HARRIS.

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