US 1378623 A
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Description (OCR text may contain errors)
H. 1. SCHAFFEB.
* ASH SIFTEH.
APPLICATION FILED JUNE 5, 1920.
1,378,623. v Patented May 17, 192 1.
A TTURNEYS UNITED STATES PATENT OFFICE.
HENRY J. SCI-IAFFER, or BROOKLYN, NEW YORK, Assrenon To JACOB STCHAFFER, or
. BROOKLYN, NEW YORK. V
, Specification of Letters Patent.
Application filed June 5, 1920. Serial No. 386,853.
To all whom it may concern:
Be it known that I, HENRY J. SCHAFFER, a citizen of the United States, residing at the city of New York, in the borough of Brooklyn and State of New York, have invented certain new and useful Improvements in Ash-Sifters, of which the follow .ing is a full, clear, and exactdescription.
In ash sifting devices as now commonly made, the ashes are first separated from the coarser portion and the latter is subsequently gone over and the unburned coal and slag or clinkers separated, which entails two distinct and consecutive opera tions. An object of this invention is to provide a mechanical sifter so arranged that the operator can separate the unburned coal and clinkers while engaged in the separation of the coarse and' fine portions, all in one continuous operation.
Another object of my invention is to provide improved means for 'allaying the dust normally created by the sifting op eration and without increasing materially the number of parts commonly ,used in sifters, or the cost of the complete sifter.
Another object is to provide a drum supporting member which can be readily and rapidly stamped from light sheet material in one stamping operation, and which will be very strong and rigid.
Another object of my invention is to provide a sifter which is efficient and rapid in operation, and simple, durable and inexpensive in construction.
Other objects will appear from the following description and the novel features of myjinvention will be pointed out in the appended claims.
In the preferred embodiment of my invention a rotary cylindrical screen is employed, the unsifted ashes being supplied through a hopper at one end and the unburned coal and clinkers free from the fine ashes being discharged from the other end through a chute into a trayso that while the sifter is being manipulated with one hand, the operator can with the other hand remove the cli-nkers and deposit them in the receptacle for the fine ashes and trip material. and which willibe very rigid, and
preferably of a shapewhich can be rapidly stamped from sheet material in one operation. i
I may also supply a spray of water to the lnterior of the cylinder" by means of the hollow shaft of the rotatable screen, in order to allay the dust created by the sifting operation. The invention also. comprises certain other details of construction as will hereinafter appear.
In the drawings: Figure 1 is a plan of a sifter constructed in accordance with my invention;
F 1g. 2 is a vertical longitudinal cross section of the same;
Fig. 3 is an elevation of a ing member, and
. Fig. 4 is a plan of the same. I In the illustrated embodiment the casing is provided with a flanged base, 1 adapted to fit over and substantially close a barrel on other suitable receptacle for the line or sifted portion of the, ashes. i .The body 2 of the casing is mounted upon the base l, its side walls being joined with the base for this purpose. The base 1 is provided with a large opening 3 beneath the body portion through which the sifted or line ashes pass into the receptacle, and a small opening 4 at one side of the body2 through 3 which clinkers and slag maybe drum supportpassed by the operator when it has been separated from the unburned coal in a manner to be hereinafter explained. A removable cover 5 normally covers the opening 4;. Within the body 2 is disposed the sifting screen 6, which is; cylindrical in shape and Patented May 17, 1921- carried by drum supporting arms or members '7 upon the hollow shaft 8. A hopper 9 secured to one end of the body 2 is adapted to feed the unsifted ashes intoone end of the cylindrical screen. The other end of the body is closed exceptfora chute 10, which isformed therein for receiving the coarseportion or screenings of the ashes and conducting the same out of thecasing separate from the fine portion of theashesa The hollow shaft ;8 is rotatably mounted in the front and rear ends of the casing and is inclined downwardly toward the rear or I chute end for the purpose of causing-a gradual movement of the ash toward the chute.
In the embodiment illustratedinFigs. 1 and 2, one endof the shaft is sealedas at 11 and has an offset or bent portion 12 the tray normally assumes a position be forming a crank handle for the manual operation of the shaft and cylinder. The opposite end of the shaft is provided with a connection 13 to a conduit 14 through which the shaft is supplied with a dust allaying liquid, such as water, the liquid escaping from the shaft into the cylinder as a spray by means of a plurality ofperforations 15 in the portion of the shaft inclosed by the cylinder. The connection 13 may be of any suitable construction permitting relative rotation between the shaft 8 and the conduit 14:.
It is also obvious that if desired the hose connection may be attached to the crank end of the shaft, with the chute end of the shaft capped. In this embodimentthe crank is utilized to give the drum an oscillatory movement since it may not be convenient to impart complete rotary movement thereto. A rectangular tray 16 is supported upon the chute end of the casing by means of links 17, which are pivotally connected at one end to ears 18 carried by the casing and at their other ends to opposite side walls of the tray at points between the center of each side wall and the corners nearestthe casing, so that neath the chute (Fig. 2) and receives the discharge therefrom. The tray can be manually shifted at will about the axes at either end of the links to dump the contents thereof into a special container, the dumping position being indicated by dotted lines in ig. .2.
The drum supporting arms or members 7 are illustrated in detail in Figs. 3 and 4. While the arms 7 may in their broadest conception be tubular members with flattened ends, they are preferably formed by stamping from plain sheet metal strips in a manner well known. The ends 19 are bent at substantially right angles to the cross arm portion 20 to facilitate attachment to the drum and the edges 20 of intermediate section of the stamped strip are bent over in a direction opposite to the arms 19. The cross arm portion is provided with a central aperture 21 through which the hollow pipe or shaft 8 passes and upon which itis supported. The arms 7 are held against movement on the shaft by means of pins 22 which pass through alined apertures 23 in the bent over edges ofthe cross arm portion and through the hollow shaft 8. The ends 18 have suitable apertures 241 therein for attachment of the arms to the inner wall of the drum or cylinder. The arm 7 in the preferred embodiment can be readily stampedor drawn by dies from sheet metal in one operation, and I have found that in the stamping operation there is no tendency to deformity of the article along other lines than those intended, such as would cause, for example, the stamping to be pulled out of proper posit-ion with respect to the dies.
The arms 7 can be of a much lighter material than has been heretofore used for such parts, since the bent over edges of the cross arm portion provide sufficient rigidity and strength. The position of the apertures 23 in the the side walls of the cross arm facilitates the passage of the pins 22 in the assembling operation, and the pin can be placed rather close to the shaft hole or aperture 21, without materially weakening the arm.
'In operation water is supplied through conduit 14 and connect-ion 13 to the hollow shaft 8 from which it escapes in various directions from that portion within the cylinder to allay any dust created by the sifting operation and wash the unburned coal. The hopper may be filled with unsifted ashes, the tray placed in the position illustrated in Fig. 2, and the crank handle 12 then. operated manually (or otherwise) to rotate the shaft 8 and cylinder 6. The ashes will be carried from the hopper into the cylinder and the rotation of the latter will cause the contents thereof to move toward the lower end. During this movement the rotation will produce suilicient agitation to cause the passage of the finer portions of the ashes through the meshes of the cylindrical screen into the receptacle on which the sifter rests, while the coarser portions will be discharged at the lower end into the chute and conducted into the tray 16. The operator while continuously operating the crank 12 may also observe the discharge into the tray, pick out the pieces of slag and clinkers, remove the cover 5 and drop the slagand clinkers into the eshreceptacle through the passage 4. When the tray becomes filled with the unburned coal, it may be shifted on the pivots at either or' both ends of the links 17 into the position indicated in dotted lines in Fig. 2 to dump the contents into a suitable container. Thus the separation of clinkers and unburned coal can be carried on by the operator simultaneously with the sifting operation, thereby saving considerable time in the complete operation. The water or other liquid which is supplied through the hollow shaft allays' all dust which is created by the agitation of the ashes. The utilization of the hollow shaft as the su ply or spray pipe for the water, enables t e application of the water to allay the dust in the most efficient man ner, avoids the use of extra pipe, very materially simplifies the construction, and reduces the cost.
It is obvious that various changes may be 1. In a sifter, a screen, a casing inclosing said screen, a support rotatably carried by said casing and mounting said screen for a sifting movement within the casing, means for feeding a substance to be sifted to the screen, and means for supplying a dust allaying liquid through the support to the substance and screen.
2. In a sifter, a screen, a casing inclosing said screen, a support rotatably carried by said casing and mounting said screen for a sifting movement within the casing, means for feeding a substance to be sifted to the screen, said support being hollow to form a conduit and having a plurality of perforations in the walls thereof in the portion adj acent the screen, and a connection for supplying a liquid to said support and thus to the substance and screen through said perforations. v
3. In a sifter, a cylindrical screen, a casin inclosing said screen, a hollow shaft rotatably supporting the screen. within the casing, a hopper for feeding a substance to be sifted to the interior of the screen, said shaft having a plurality of perforations in its walls in the portion adjacent the screen for discharging a dust allaying liquid upon the substance within the cylinder, and means vfor supplying liquid to said shaft.
4:. In a sifter, a cylindrical screen, a casing inclosing said screen, a hopper at one end for feeding the substance to be sifted tothe interior of the screen, a hollow shaft carrying said screen and extending lengthwise through and mounted for rotation in said;
casing, one end having a portion without the casing and offset to form an operating crank, the portion of said shaft within the screen having a plurality of perforations therein casing, one end having a portion without the casing and offset to form an operating crank, the portion of said shaft within the screen having a plurality of perforations therein for supplying a liquid to the substance being sifted, and a liquid supply conduit, connected to the other end of said shaft with provision for relative rotation therebetween.
6. A strap having an aperture in the face thereof and its ends bent at right angles to the face, the edges of the strap adjacent the aperture being bent over into positions sub stantially parallel with the axis of the aperture, the remainder of the edges remaining unbent.
7. In combination, a shaft, a strap comprising a rectangular strip of metal, having its end bent at right angles thereto and the central portion of the side edges bent at right angles thereto, the remainder of the edges remaining unbent, said strap having an aperture in its face through which the shaft passes, and a locking pin passing through the bent over side edges of the strap and through the shaft. 7
In witness whereof, I hereunto subscribe my signature.
HENRY J. SGI-IAFFE'R.