US407949A - Dust oolleotob - Google Patents

Description

4 Sheets-Sheet 1.

(No Model.)

J. M. CASE.

DUST COLLECTOR.

No. 407,949. PatentedJuly 30, 1889.

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(No Model.) 4 Sheets-Sheet 3.

J. M. CASE. DUST GOLLEQTGR.

No. 407,949. Patented July 30, 1889..

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4 Sheets Sheet 4.

(No Model.)

J. M. GA'SE. DUST GOLLEGTOR.

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UNITED STATES PATENT OFFICE.

JOHN M. CASE, OF COLUMBUS, OIIIO, ASSIGNOR TO THE CASE MANUFAC- TURING COMPANY, OF SAME PLACE.

DUST-COLLECTOR.

SPECIFICATION forming part of Letters Patent No. 407,94=9, dated July 30, 1889.

Application filed June 21, 1887. $eria1 No. 242,020. (No model.)

To all whom it may concern.-

Be it known that I, JOHN M. CASE, a citizen of the United States, residing at Columbus, in the county of Franklin and State of Ohio, have invented certain new and useful Improvements in Dust-Collectors, of which the following is a full, clear, and exact description.

The invention consists in certain features of novelty, which are hereinafter particularly pointed out inthe claims, being first fully described with reference to the accompanying drawings, in which FigureI is a side elevation, partly in section, of a dust-collector embodying my invention. Fig. II is a similar view of a dust-collector of smaller capacity embracing the same features. Figs. III and IV are vertical transverse sections of the same on the line III III and IV IV, respectively, Fig. II, looking in the direction of the arrow. Fig. V is a transverse section of one of the air-tubes and its opposing shield on the line VV, Fig. II. Fig. VI is a similar View showing an air-tube of slightly-modified construction. Fig. VII is a vertical longitudinal section of one of my im proved dust-collectors modified with respect to the means for dislodging the dust from the dust-arresting cloth. Fig. VIII is an elevation of a pair of dust-collectors mounted upon a common shaft with means for arresting one while the other is in operation. Fig. IX is a detail view showing a modification of the discharge-valve.

The principle involved in the present invention is the same as that involved in my improvements in dust-collectors which form the subject of four applications filed on the 30th day'of March, 1887, and serially numbered 233,009, 233,010, 233,011, and 233,0li respectively, the present invention being dilferent from my said former inventions only in the details of construction.

In my former invention the dust-arrestin g cloth and the device for dislodging the dust from the meshes thereof have a relative reciprocating motion, while in the present i11- vention the movement is rotary, the advantage being that the machine may be con structed at a much less expense and in amore compact form.

Referring to the drawings, A represents the end walls of the casing,which maybe of any desired shape, (those here shown being square,) and provided with large apertures, over which cloth B is tightly stretched, said cloth being sufficiently fine to arrest all the dust, but yet permit the passage of the air freed from its impurities. Situated between the end walls A is a drum C, which is preferably circular in form, at least on the lower side, and centerminous at its inner periphery with the open-- ings through the end walls A. At the upper side this drum is cut away, as at c, and communicates with an air-trunk D, by which the dust-laden air is conducted to the machine. The drum. is also cut away near the bottom portion, as at c, for the purpose of permitting the dust arrested by themachine to be discharged. This opening is closed by a valve so arranged as to permit the ready discharge of the accumulated dust and dirt, but at the same time prevent the escape of impure air. To this end a cylindrical valve-casing E, open at one side for communicating with the opening 0 and at the opposite side for the discharge of the dust, is secured to the outside of the drum C, as shown in Fig. IV. Journaled concentrically within this valve-casing is a shaft E, from which project radiallylongitudinal blades 6, so disposed as to intercept at all times the passage through the valvecasing. The accumulated dust is scraped up to and falls through the opening 0' into the pockets formed by blades e, and when the shaft E is rotated, by means hereinafter described, said dust is discharged through the opening in the opposite side of the valve-casing E. If desired, this rotary valve maybe replaced by the simpler and very well-known weighted valve shown in Fig. IX.

The operation of so much of the device as has thus far been described is perfectly clear. The impure air enters the casing at c, the impurities being arrested by the cloth B as the air passes through it. I

The next thing in order is to describe the means for keeping the meshes of the cloth free and open.

F represents a shaft which passes through the casing centrally with respect to the drum 0 and the openings over which the dust-arair is forced into said shaft for the purposev which will appear presently. The devices for cleaning the several cloths are alike in every respect, so thata description of one will suffice. Secured perpendicularly to this shaft, and at such a point that it will move in contact with the outer surface of the separating-cloth B,is

an air box or tube L,which may be constructedof several pieces and of rectangular shape in cross-section, as shown in Fig. V, or of a single piece of sheet-metal tubing, as shown in Fig. VI. The interior of this air box or tube communicates with the interior of the shaft F through apertures f cut through the latter, and the side of the said box which is in contact with the cloth B is provided throughout its length with a very narrow slit Z. It will thus be seen that the air forced into the hollow shaft F will escape through the openings f into the air boxes or tubes L, whence it escapes through the slits Z and passes through the cloth B in a very thin film, thereby blowing the accumulated matter out of the meshes and dislodging from the inner surface of the cloth all matter which may be held in contactv therewith by reason of the constantly outrushing current of air. This air box or tube extends diametrically across the surface of the cloth, so that every portion of the latter will be subjected to the action of the air-current as the boxes are moved over it by the rotation of the shaft F. Means must, however, be provided forpreventing that matter which has been thus dislodged from being again forced into contactwith theinner surface of the cloth by the current of air which is constantly rushin gthrough it from within the casin g. To this end I secure to the shaft a guard or shield M, which is situated on the interior of the cloth B, and lies inthe same plane as the air-tube L.

This guard is preferably of the shape in crosssection shown in FigsVand VI, the edges being curved backward in order to prevent abrading the surface of the cloth B against which they have contact. This shield extends diametrically from one side of the drum-C to the other, and-may be secured'to the shaft F and braced in any suitable or desired manner which shall give it the requisite rigidity. In Fig. II it isshown slit, so as to form tongues which are bent at right angles to the plane of the shield and secured to the shaft by bolts, screws, or rivets. It is shown in Fig. VII as provided with a simple perforation of such shape as to permit the passage of the shaft without having a space between them, and is secured to the shaft by separate angle-irons or brackets N. This shield effectually prevents the passage of air outwardthrough that portion of the cloth which is for the time being being acted upon by the air-blast from the tube or box L, and thereby forms a dead air space within which the dislodged dust and other matter is precipitated to the bottom of the drum 0. The construction of this shield should be such that the shaft F does not completely cut off communication between its two ends, so that the dust which is dislodged from the upper part of the cloth maypass directly through the dead-air space to the bottom of the drum. This, however, is not essential, and, if desired, the opposite ends of the shield may be made and secured to the shaft separately, so that its opposite ends have no internal communication.

is caught by a scraper O, which is fixed to the shaft F by an arm 0, and scraped into the opening a. The wings a of the valve may be of such width as to project into the airchamber beyond the inner surface of the drum 0, and so situated on the shaft E with respect to each other that one of them will always be projecting into the path of the scraper 0, whereby the valve may be turned by the scraper each time it passes a distance equal to the distance between two of the wings e; or, if desired, the valve-stem may be provided outside the casing with a tappetwheel, with teeth similarly arranged, to be operated by the air tubes or boxes, in which case the wings a should not project beyond the casing E.

In Fig. I, I have shown a number of these dust-collectors arranged on a single hollow sh aft, and situated in such proximity to each other that the space between the outer surfaces of the cloth B on. the adjacent sides of two adjacent catchers is just sufficient to admit the air box or tube L, which is provided on each of its opposite sides with a longitudinal slit, whereby each box may operate to clean two cloths.

' In Fig. VIII,- 1 have shown two entirely separate and distinct catchers, such as shown in Fig. II, secured on one hollow shaft which is jointed by a collar P, screwed onto one portion of the shaft and fastened to the other by means of a pin P", so that one end may be rotated without the other, thereby stopping one of the machines while the other is at work, the continuity of the shaft for the purpose of an air-duct being unbroken.

In Fig. VII, I have shown a modification of the'device, which maybe fully understood on reference to my previous applications, already referred to. This cleaner here employed is not pneumatic. A brush Q is secured to the inside of the shield M, so as to have contact with the surface of the cloth for brushing off the impurities. Secured to the shaft, outside of the cloth-.13, and directly opposite the brush, is an arm or support R,which bears against the cloth and holds it to the action of the brush.

The dust I having fallen onto the bottom of the drum 0 IIO I do not claim in this application anything which is shown in either of my aforementioned applications.

In the foregoing part of this specification, and in the claims which follow, I mention a fan as the means for producing the necessary current of air through the dustarresting cloth; but I desire to have it understood that I do not regard my invention as limited thereto. It is manifest that a pump, or, in fact, any pneumatic apparatus, may be employed, and such is the interpretation which I desire to place upon the word fan as employed in the claims.

Having thus described my invention, the following is what I claim as new therein, and desire to secure by Letters Patent:

1. The combination, with the casing and dust-arresting cloth, of a shaft, an air-tube secured thereto so as to move in close proximity to the surface of the cloth and having a slit for projecting air against said cloth, a fan having communication with said air-tube, and a shield secured to the shaft inside the cloth and situated directly opposite the airtube, substantially as and for the purpose set forth.

2. The combination, with the casing and the dust-arresting cloth, of a hollow shaft, a fan communicating with said shaft, an airtube secured to said shaft and having communication with the interior thereof, said tube having an aperture through which air is directed against and through said cloth, and a shield secured to the shaft on the opposite side of the cloth and directly opposite the airtube, substantially as set forth.

boxes or tubes secured to said shaft so as to have contact with the dust-arresting cloth and having communication with the interior of said shaft, slits formed in the sides of said boxes which have contact with the cloth, shields situated inside the casings and secured to the shaft opposite the air-boxes, means for rotating said shaft, and means for disconnecting the sections of said shaft whereby the rotation of a portion of the shaft may be checked while the whole of it is available as an air-conduit, substantiallyas set forth.

5. The combination, with the drum 0, having the discharge-aperture c,and the en (1 walls A, having openings for the egress of air, of the dust-arresting cloth secured over said openings, a shaft passing through the casing concentrically with the drum, means secured to said shaft for dislodging the dust from the cloth, and a scraper secured to said shaft for scraping the dirt'to the discharge-aperture, substantially asset forth.

6. The combination, with the drum 0 and the dust-arresting cloth situated at the end being operated upon, substantially as set forth.

JOHN M. CASE.

Witnesses:

C. N. SHOUGH, E. D. ANDERSON.

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