US2308309A - Dust arresting apparatus - Google Patents

Description

Jan. 12,11943., Y I Raul-:Mam ETA... 2,308,309

DUSAI1 ARRESTINGAPPARATUS Eiled DSG. 26, 1940 Patented Jan. 12, 1943 srATEsrArs 'r trice DUST ARRESTING APPARATS melin Application December 26, 1940, Serial No. 371,690

4 claims. (ci. 18s-47s) This invention relates to improvements in dust arresting apparatus.

Dust arresting devices as commonly constiucted include a collecting box into which the dustladen air is blown, and a plurality of filter 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 liner particles of dust pass up into the filter 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 filter 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 difficult. Thev spaces between collars are narrow and relatively inaccessible, and the dust can not be swept'into the collector box openings because the collars interfere. 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 f 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, eliminatingthe necessity Aof clamps, reducing manufacturing costs, and rendering the openings flush 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 more specific object of the invention is to provide in apparatus asgabove described, a collector box having a horizontal wall formed'with openings therein, lter bags having circular lower ends equipped with spaced deformable rings engageable both above and below the material forming the marginal edges of said openings to 'Ihis clamping method also renders the vide a construction as above described wherein 55 the deformable rings, in the preferred embodiment, are in the form of coil springs.

A further object of the invention isto provide a construction in which annular ledges below the openings in the top wall of the collector box may be employed to cooperate with one ofthe deformable rings.

A still further object of the invention is to provide a construction as above described in which the annular ledges may extend at an angle so that the deformable rings may have a wedging engagement between the ledge and the lower face of the wall around the openingtherein.

With the above and other objects in view, the invention consists of the improved dust arresting apparatus and all its parts and combinations as set forth in the claims and all equivalents thereof. v

In the accompanying drawing illustrating several preferred embodiments ofthe 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 filter bags extending upwardly from a dust collector box;

Fig. 2 is a fragmentary vertical sectional view on an enlarged scale showing the engagement of the lower end of a filter bag with the material surrounding an opening in the top wall of the collector box, part of the bag being broken away;

Fig. 3 is a plan view of the preferred form of deformable ring;

Fig. 4 is a view similar to Fig. 2 showing a modification wherein the lower deformable ring cooperates with an annular ledge;

Fig. 5 is a View similar to Fig. 4, showing another modification wherein the ledge-forming member is of different shape than that of Fig. 4;

Fig. 6 is aview similar to Fig. 2 wherein the deformable rings are in the form of band spring material rather than in the form of coil springs;

Figs. 7 and 8 arefragmentary vertical sectional views showing the use of a flange at the edge of the openings; and

Fig. 9 is a fragmentary vertical sectional view of another modification.

box I0. The upper ends of the bags are connected by hooks II with horizontal frame members I2, and during operation of the dust arrester, reciprocating motion is applied to the frames I2 to shake the upper ends 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 I0, it being understood that in this type of device the dust-laden 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 wallsA 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 collector box eXteriorly of the filter bags. Where collars were employed this dust would lodge in the narrow spaces between the collars. It has heretofore been necessary to periodically disconnect the lower ends of the bags and remove the dust deposited on top of the wall |31. Naturally, this dust could not be swept into the openings 9 because the collars heretofore used interfered. 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 of the filter bags are disconnected, and the dust is swept directly into the openings 9, which, being merely holes stamped into the metal I3, are flush with the top surface of the wall I3.

In order to permit the above purpose to be accomplished it was necessary to devise a simple and inexpensive arrangement for removably connecting the lower ends of the bags to the openings 9 without employing any collars. It was further necessary that this connecting means provide a tight seal at the lower ends of the bags in order to prevent leakage of dust to the exterior.

In order to accomplish the above purpose, the lower end of each filter bag has a doubled-back portion forming a loop I4 in cross-section. This may be formed by a separate doubled-back piece of material I5 stitched to the lower end of each bag as at I5. The material I 5 may be of a different nature than the material of the lter bags proper so as to have greater resistance to tearing and cutting and may, if necessary, be reinforced on the outer side, where there is contact with the edges of the openings 9, with leather or other suitable material.

Conned within the loop I4 at the lower end of each filter bag are super-imposed deformable rings I and I'I. These rings are vertically spaced, and the material of the loop I4 is preferably stitched together between the rings as at I8 to maintain the rings in properly spaced condition. In the preferred form of the invention, these rings are formed of coil springs as illustrated. in Fig. 3, normally holding themselves with considerable tension in a circular condition, but being nevertheless readily deformable by pressure of the hand. The rings `Ii and II are of greater diameter than the openings 9 in the top wall of the collector box.

To connect the lower end of a bag, the rings I6 and l1 are deformed to permit insertion of the lower ring I'I through the opening 9. The rings are then permitted to expand with the'result that the outer side of the looped fabric is pulled tightly against the edge of the material of the wall I3 surrounding the opening 9. This ls clearly illustrated in Fig. 2, wherein it may be seen that a very tight seal is provided at the lower end of the bag so that no dust can pass out between the outer side of the bag and the edge of the opening.

It is apparent that the lower end of the filter bag may be readily disconnected by deforming the rings I6 and I'I to such an extent that ring I'I may be drawn upwardly through the opening 9. When the lower ends of the bags are disconnected any dust on the upper surface of the wall I3 between the openings 9 may be quickly swept into the openings.

In the modification illustrated in Fig. 4, an annular ledge forming member I9 is connected by welding or the like as at 20 to the lower side of the wall I3 around each of the openings 9. The portion 2l of the ledge forming member Ymaybe angled toward the wall I3 so that the lower ring I'I wedges itself between the angled ledge 2I and the lower portion of the wall I3 surrounding the opening. This construction affords an additional seal, but is more expensive and not essential for most installations.

In the form of invention illustrated in Fig. 5, another method of forming a ledge is illustrated. In this construction the annular ledge forming member 22 is S-shaped in cross-section with a portion 23 hooking over the edge of the metal surrounding'the opening 9 and with the lower portion enlarged and rounded as at 24 to snugly receive the lower deformable ring II as illustrated. The member 22 may also be formed with a rounded enlargement above the wall I3 for cooperation with the upper deformable ring I6 if desired.

The constructions of Figs. 4 and 5 may be employed without using the upper deformable ring I6 because a tight seal is vformed between :the lower ring and the ledge forming members.

In the form of invention illustrated in Fig. 6 the construction is the same' as Fig. 2 except that in lieu of the deformable rings I6 and I'I of coil spring formation, the rings I6 and II are of band spring formation. These rings which are also deformable, provide for quick connection or disconnection of the bags from the openings-in thesame manner as described in connection iwith Fig.2.. 1

In Fig. 7, the edge of the material surrounding each opening 9 is flanged downwardly as at 25,

`and the lower ring I'I engages-with said'flange.

In Fig. 8, the edge is flanged upwardly. as at 26, and the upperiring I 6 engages withsaid flange 26. The constructions. are otherwisethe same as the constructionof Fig; 2,

In Fig. 9 the edge of the openng of thewall I3 may be equipped with fianges 21 and 28 which extend at an angle of approximately 45 with respect to the wall. These flanges maybe formed by inserting a. band of metal inthe opening and by pressing the same into V-formby the use of a suitable die.v The apexV of the V maybe welded to the edge of the opening 9;` With this construction the rings I6 and I'I yieldingly pressthe Inaterial at the lower end of the filter bag against the angular flanges 21 and 28 to formf af readily disconnectable seal. The construction is otherwise the same as described in connection withthe form of Fig. 2. v-

Itis obvious that the spaced deformablerings I6V and- I'I or IB' and I1 need not be separate members but may be of combined one-piece construction providing an edge receiving recess therebetween so that there is engagement both above and below the material surrounding the openings 9 in the top wall I3. Various other changes and modifications 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 comprising a receptacle wall portion extending transversely of the axis of the lter bag when the latter is attached, said Wall portion having an opening therein, two yieldingly deformable rings secured one above the other in longitudinally spaced relation to the lower end of the filter bag, said rings being normally of greater diameter than the opening of the receptacle wall and being so spaced with respect to the thickness of the Wall that when the bag is in assembled position there is formed an external lower end groove of a size to snugly receive the thickness of the wall portion surrounding the opening, with said wall tightly contacted at its edge and on its upper and lower surfaces.

2. Attachment means for connecting an end of a tubular filter bag to a receptacle comprising a receptacle wall portion extending transversely of the axis of the filter bag when the latter is attached, said wall portion having an opening therein, two yieldingly deformable coiled spring rings secured one above the other in longitudinally spaced relation to the lower end of the lter bag, said rings being normally of greater diameter than the opening of the receptacle wall and being so spaced with respect to the thickness of the wall that when the bag is in assembled position there is formed an external lower end groove of a size to snugly receive the thickness of the Wall portion surrounding the opening, with said wall tightly contacted at its edge and on its upper and lower surfaces.

3. Attachment means for connecting an end of a tubular filter bag to a receptacle comprising a receptacle Wall portion extending transversely of the axis of the filter bag when the latter is attached, said wall portion having an opening therein, means surrounding said opening and depending from the lower face of said Wall portion to provide an annular pocket outwardly of the margin of the opening including an annular ledge spaced below the lower face of said wall and having its free edge extending toward the axis of the opening of said Wall, two yieldingly deformable rings secured one above the other in longitudinally spaced relation to the lower end of the filter bag, said rings being normally of greater diameter than the opening of the receptacle Wall and being so spaced with respect to the thickness of the Wall that when the bag is in assembled position there is formed an external lower end groove of a size to snugly receive the thickness of the Wall portion surrounding the opening with said wall tightly contacted at its edge and on its upper and lower surfaces and with the annular ledge tightly contacted.

4. Attachment means for connecting an end of a tubular filter bag to a receptacle comprising a receptacle Wall portion extending transversely of the axis of the filter bag when the latter is attached, said wall portion having an opening therein, a flange on the marginal edge of said opening projecting in one direction therefrom, two yieldingly deformable rings secured one above the other in longitudinally spaced relation to the lower end of the lter bag, said rings being normally of greater diameter than the opening of the Wall portion and being so spaced with respect to the thickness of the Wall and the width of the flange that when the bag is in assembled position there is formed an external lower end groove of a size to snugly receive the thickness of the wall portion surrounding the opening with said wall tightly contacted at its edge and on its upper and lower surfaces, the flange being accommodated in the inner portion of the groove.

RICHARD RUEMELIN.

OWEN H. HARRIS.

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