US2432599A - Ash sifting device - Google Patents

Description

Dec. 16, 1947. A. s. WEYINSTEIN 2,432,599

ASH SIFTING DEVICE Filed Jan. 19, 1944 Sheets-Sheet 1 Dec. 16, 1947. s, w s-rgm 2,432,599

ASH S IFTING DEVICE Filed Jan. 19, 1944 2 Sheets-Sheet 2 III] llll

BY W99" 27 /1is Affomgf Patented Dec. 16, 1947 -UNITED STATES PATENT OFFICE ASH SIFTING DEVICE Abraham S. Weinstein, Brighton, Mass.

Application January 19, 1944, Serial No. 518,828

7 Claims.

The present invention relates to an ash sifting device to be installed in furnaces using coal, coke or other types of fuel in which it is desired to separate the ash and cinders without removing the burned and unburned residues first from the pit of the furnace.

Devices of this nature which have previously been used are either of such construction that some of the unsifted residue will fall through or around the sifter itself and therefore be mixed with the ash that falls through the sifter into the pit below, or of such a bulky and expensive nature that they are difiicult to install and do not readily permit the sifted cinders to be removed easily from the bottom of the furnace.

In the present invention the sifting device may readily be installed within the pit of the furnace without the necessity of removing doors or mak ing any changes in the construction of the pit itself. A further advantage of the sifting device of the present invention is that the device may be operated and sifting accomplished without the furnace doors being opened to any substantial degree, thereby avoiding dust coming out of the furnace. Further the device cannot only be easily installed without drilling or altering the furnace itself, but it can also be readily removed and used in any other similar furnace. A further feature of the present invention is that the ash pit itself is unobstructed and free in the present installation so that the ashes may easily be shovelled out in the same manner as they previously were without any fear of injuring the sifting mechanism or its supporting structure.

As a further feature in the present invention, the sifting may be made automatic with the turning of the grate bars and in addition further shaking of the sifter is possible after the bars of the furnace have been thoroughly turned or shaken.

A still further feature of the present invention is that the sifting screen is easily removable and replaced, and likewise also the sifting frame itself or any other portion of the mechanism installed in the furnace.

This and other features of the present invention will be more fully appreciated and understood in the explanation and description of the invention given in the specification below when taken in connection with the drawings illustrating an embodiment of the invention, in which:

Fi ure 1 shows a substantially horizontal section through the furnace over the grate barsv illustrating my invention.

Figure 2 shows a fragmentary view in elevation of my invention indicating its relative position in the ash pit of the furnace.

Figure 3 shows an end view of the invention as viewed from the right of Figure 2.

Figure 4 shows an enlarged view of the ash sifter shown in Figure 3 in relatively the same position.

Figure 5 shows a plan view of the sifter shown in Figure 1.

Figure 6 shows a fragmentary section taken substantially on the line 6--6 of Figure l, the furnace casing being omitted.

Figure 7 shows a fragmentary section taken substantially on the line 'l'! of Figure 1.

Figure 8 shows a detail of the assembly of the frame for holding the ash sifter prior to the frame being put in final position.

Figure 9 shows a detail of the arrangement for connecting the sifter to be operated by the action of the grate bars, and,

Figure 10 shows a fragmentary side elevation of the detail shown in Figure 9.

In Figure 1, the furnace section in the ash pit is shown at I. This has a front supporting frame 2 on which the furnace door is hung and through which the extension rods 3 and 4 project, which are provided with prism shaped ends 6 and 5 on which removable crank arms are placed for turning the grates. The extension rod 3, as in the usual construction, may operate a gear 1 which in turn operates gears 8 and 9, so that by movement of the extension rod 3, the grate bars HI, I! and 12 are rotated. The extension rod 4 usually controls two grate bars, the one l3 which is part of the extension 4, and a second one, not shown, further towards the side of the furnace. The side grate bars support the entire ash sifting mechanism by means of four S-shaped hooks, l4, i5, 16 and I1. These S-shaped hooks, the large end of which hangs over the grate bars, support two side elements [8 and IS, the side element is being supported by the hooks I6 and i1, and the side element l9 being supported by the hooks l4 and [5. These side elements comprise apron portions 20 and 2| which are sloped slightly upwards and are shaped in an are conforming to the side walls of the furnace. sufficient clearance must be left between the side walls and the edges of the apron so as to permit the sifter to be shaken from side to side for sifting purposes.

Various sheet elements are attached to the apron by riveting or otherwise to form a substantially squared C-shaped channel as illustrated in Figure 6 which is formed by the member 2'2 and the flange extension 23 which is an extension of the apron 2%. This construction is used for both the supporting elements 88 and I9. The hooks previously mentioned are freely suspended in holes in the apron portion and 2| of the supporting members l8 and 19. These side supporting members are designed to receive a supporting frame 3| which may be rectangular in shape and which is designed so that it, together with the side supporting elements, forms a substantially rigid supporting structure for the ash sifting pan. This frame comprises a front cross supporting bar 24 to which inverted side L-shaped channels 25 and 26 are riveted by means of rivets 21, for the. L.-shaped channel 25 and rivets 28 for the L-shaped channel 25.

As shown in Figures 1 and 8, the union is actua ly made bytriangular pieces 29 and 30, the front bar 24 being riveted to the triangle 29 by rivets 29' as shown in Figure 8. The frame is completed in the back by a cross supporting member 32 which is held to the side supports 25 and 26 by means of corner pieces 33 and 34 by riveting as indicated at 35 and 36 or by spot welding or by any other suitable method. The frame 3| so formed provides a substantially rigid structure so that the whole frame is actually freely supported from the four hooks hanging over the grate rods or bars. The back supporting portion of the frame 3! is provided with an apron 31 which extends outward and upward at a slight inclination to the side walls of the furnace with approximately the same clearance as the apron portions 2!! and 2! so that the ash pan and frame may readily be shaken with a sufficient movement to do the job of sifting properly. The back supporting element of the frame 3| is provided with extending tongues 38 and 39 at either side which fit over the side supporting elements 18 and I9 and actually over the projecting flange 23 of the apron 2|, as illustrated in Figure 6. Attached also tothe back supporting cross piece 32 of the frame is a squared U-shaped channel 40 which is provided with a flange 4| through which the channel is riveted to the piece 32, as illustrated by the rivet 42 (see Figure 6). This U-shaped angle element or channel fits around the lower two sides 43 and 44 of the side supporting pieces I8 and I9 as illustrated in Figure 6, while within the two supporting pieces 43 and 33 the L-shaped channel of the sides of the frame as, for instance, 25 slide. Each side of the frame 3! may therefore be slid in place engaging the C-shaped channel of the side supporting members It and I9. Interlocking of side supporting members 3 and [9 of the frame 3i is best observed through the association of Figures 1, 2, '7 and 8.

The forward cross supporting member 24 of the frame is provided with an extending projection or tab 45 which may be a continuation of a part of th bar 24 and a downwardly projecting tab or angle element 46 which may be bent downward from the bar 24 over the channel member 25. The member 22 of the side supporting element comes in contact in final position with the downwardly projecting tab 55 and the member 45 is designed to slide under an extension of the element 22 indicated as 22 in Figure 8.

In the final position the supporting element and the frame may be locked by bending the piece 22' around the member 45 (see Figure 2). Security, however, of the'element is also obtained by means of the hook member 48 into which the element 43 looks in final position.

In the assembly therefore of the sifter frame and its support, the two side supporting elements are first put in place and then the frame 3| is slid into the supporting pieces with the side channels 25 and 25 engaging the c-shaped channels in the side supporting members. When the assembly has been locked. in place, the sifting tray 56 may be inserted. This tray is provided with side flanges 5| and 52 which rest on the lower flanges 44 of the side supporting pieces. The tray itself is formed with a removable bottom screen 53. This screen rests in channels 54 and 55 formed at the sides of the bottom of the sifting pan 50 with suitable bent sheet elements. A

detent element 56 is pivoted at the front face of i the pan at the pivot 51 in such a way that it may be turned downward to lock the sifting screen 53 in place. A pull tab or handle 58 may be provided for the screen so that it can be easily grasped and removed. The pan also has a long handle 59 suitably attached to it. As indicated in Figure 4, One end of the handle is attached to the pan by being bent to conform to the shape of the pan and riveted in place by suitable rivets indicated both in Figure 4 and Figure 5.

In Figures 9 and 10 there is shown a means for attaching the ash sifter to the grate rod or bar 4 so that rotating the rod will operate the sifter. Attached to the top of the front cross support 24 of the frame 3| is a yoke 60. A bar 62 is engaged in this yoke and may be adjustably positioned in it to the right or left, as viewed in Figure 10. To the bar 62 is attached a bracket 63 by means of bolts and nuts 64 and 65 which work in slots 66 and 61 respectively so that th bracket 63 may be adjusted in a vertical direction up or dOWn as viewed either in Figure 9 or Figure 10. The top of the bracket 63 is provided with teeth 68 projecting at right angles to the face of the bracket. These teeth engage a gear 69 mounted and pinned to the shaft 4. The adjustment of the bracket 63 is such that it may be lowered so that the teeth 58 are disengaged from the gear 69 in which case the automatic sifter will not be employed. When, however, the teeth 68 engage the gear 59, by applying the crank to the end 6 of the extension 4, the ash pan will be oscillated from right to left as the grate bars are moved. For hand sifting, the handle 59 is used. This handle may project through the edge of a small balanced door 18 and the entire shaking both forward and back or to the right and left may be accomplished by grasping the handle 59 and moving it in the desired manner. The support for the whole assembly by means of the four hooks I4, l5, l6 and I 1 permits the ash tray to be shaken back and forth or oscillated from side to side or even given a rotary motion with a fair sized amplitude, if desired.

Instead of lowering th bracket 62 to disengage the gear 69, the bracket 63 may be pulled 7 grate bars at each side of the ash pit, and suspending said side supports to permit free motion thereof, a rigid frame having members slidably engaging said side supports for providing a unitary structure supported by said hooks, an ash sifting pan supported by said side supports, and means whereby the pan and unitary structure may be shaken.

2. An ash sifting device for furnaces having grade bars adapted to be installed and operated in the ash pit of the furnace comprising side supporting members, each having flat sheet elements fitting approximately the contours of the furnace at the sides of the ash pit, a pair of hooks hooked over the grate bars at each side of the ash pit and suspending said side supports to permit free motion thereof, a rigid rectangular frame having side members slidably engaging said side supporting members, and forming a composite frame with said side supports, the back of said rigid frame having a fiat sheet element fitted approximately the contour of the furnace at the back of the ash pit, an ash sifting pan supported by said composite frame having a screen element ithin the enclosure of said rigid frame and means whereby the pan and composite frame may be shaken.

3. An ash sifting device for furnaces having grate bars adapted to be installed and operated in the ashpit of the furnace comprising side supporting members having flat sheet elements fitting approximately the contour of the furnace at the sides of the ash pit, a pair of hooks freely suspending each of side supporting members from the grate bars of the furnace, a rigid frame having side members adapted to engage said side supporting members and having a back portion with a flat element having a contour approximately fitting the back of the furnace, and an ash having a screen in its bottom supported by said side supporting members in position beneath the grate bars.

4. An ash sifting device for furnaces having grate bars through which cinders may be re- ,iected adapted to be installed and operated in the ash pit of the furnace comprising side supporting members having flat sheet elements fitting approximately the contour of the furnace at the sides of the ash pit, a pair of hooks freely suspending each of side supporting members from the grate bars of the furnace, a rigid rectangular frame slidably removably in said supporting members and forming therewith a composite frame, a screened bottom ash pan slidably removable in said composite frame and adapted, when in position, for use to receive the cinders rejected by the furnace for sifting.

5. An ash sifting device for furnaces having grate bars adapted to be installed and operated in the ash pit of the furnace comprising side supporting members having fiat sheet elements fitting approximately the contour of the furnace at the sides of the ash pit, a pair of hooks freely suspending each of side supporting members from the grate bars of the furnace, said side supporting members having L-shaped channels with the openings thereof facing one another in the final assembly of the device, a rigid frame having side elements adapted to slide in and fit in said channels forming together with said side supporting members a composite frame, and an ash pan having a flange adapted to rest on the lower horizontal side of said L-shaped channels.

6. An ash sifting device for furnaces having a grate bar operable by shaking mechanism including gears adapted to be installed and operated in the ash pit of the furnace, comprising side supports, means for freely hanging said side supports from the furnace grate within the ash pit, a rigid frame having members slidably engaging said side supports forming a composite frame, an ash sifting pan supported by said composite frame, said pan having means whereby it may be shaken, said rigid frame having a toothed member adapted to be brought into engagement with a gear operated by the grate shaking mechanism whereby when the grate is shaken, the sifting device will operate.

7. An ash sifting device for furnaces having grate bars and gears operated therewith adapted to be installed and operated in the ash pit of the furnace comprising side supports, means for freely hanging said side supports from the grate bars within the ash pit, a rigid frame having members slideably engaging said side supports forming a composite frame, an ash sifting pan supported by said composite frame, said rigid frame having on its front end an upwardly extending bracket with a horizontally extending toothed member adapted to engage one of said gears of the furnace grate, and means for extending said toothed member to engage said gears whereby when the grate is shaken the sifter device will operate.

ABRAHAM S. VVEINSTEIN.

REFERENCES CITED The following references are of record in the file of this patent:

UNITED STATES PATENTS Number Name Date 379,322 Murphy Mar. 13, 1888 902,829 Nostwick Nov. 3, 1908 940,403 Patterson Nov. 16, 1909 1,322,159 Berkowitz Nov. 18, 1919 1,364,926 Forrest Jan. 11, 1921 1,586,860 Swanson June 1, 1926 1,646,941 'Ienenbaum Oct. 25, 1927 1,793,376 Schantz Feb. 17, 1931 1,859,373 Nese May 24, 1932 1,922,223 Streib Aug. 15, 1933 2,092,112 Fakult Sept. 7, 1937 FOREIGN PATENTS Number Country Date 171,626 Switzerland Nov. 16, 1934

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