US1228999A - Shaking-grate for furnaces. - Google Patents

Description

H. R. WEBER.

SHAKING GRATE FOR FURNACES. Mmc/111011111513 SEPT. 13, 1915.

P11-*sented June 5, 1917.

3 SHEETS-SHEET 2.

im. WEBER.

SHAKING GRATE FOR FURNACES.

APPLICATION FILED SEPT. I3. |915.

l 928,999. Patented June 5, 1917.

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HERMAN B. WEBER, OF' DENVER, COLORADO, ASSIGNOE IO THE ECONOMY FUR/NACE COMPANY, OF DENVER, COLORADO, .A CORPORATION OF COLORADO.

SHARING-GRATE FOR FURNACES.

Specification of Letters late'nt.'

Patented J une 5, i3d 7.

Application led September 13, 1915. Serial No. 50,293.

To all whom 'it may concern.'

Be it known that I, HERMAN lt. l/Vnnn, a citizen of the United States, residing in the city and county of Denver' and State of Colorado, have invented certain new and useful Improvements in Shaking-Gratos for Furnaces; and ylf do declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the saine, yreference being had to the accompanying drawings, and to the characters of reference marked thereon, which form a part of this specification.

My invention ,relates to improvements in furnace gratos, my objectbcing to provide a shaking grate of this class which shall be of simple and economical construction and adapted to efficiently perform the required function. In my improvement l employ trunnion bars for supporting grate bars which are connected for shaking purposes, the said grate bars being constructed with special reference to the admission of a proper volume of air to the hre box, the

' said air passing through the grate and to this end the grate bars are provided with openings in which are located removable disks which as illustrated in the drawing are each composed of two parts one being a ring member having lugs which space it eXteriorly from the body of the bar; and the other part being a disk member, having lugs which space it from the inner circum ference of the ring member, the said spaces being of such width as to properly regulate the admission of air.v

f In front of the grate proper, is located a burner plate which is 'downwardly inclined from the opening through which the lire box is supplied with fuel. This plate is pivoted at its forward end and adapted to move `downwardly for the purpose of allowing clinkers to drop downwardly into the ash pit, which are too large to pass between the grate bars when in the open or dumping position. This burner plate is normally supported in the closed position by means of a slidable transversely arranged block whose extremities are supported by the adjacent trunnion bars. This block is connected with an eXteriorly located lever, and is adjustable whereby Ait 'may be readily thrown to the open or closed position by the person in charge of the furnace.

Provision is made for shaking the grate bars, through the medium of an exterior-ly located lever fulcrumed on a bracket secured to the front wall of the furnace, the lever being connected with the grate bars through the medium of connecting rods and lever arms the latter being formed upon the grate bars and extending downwardly thererrom.

Having briefly outlined my improved construction I will proceed to describe the same in detail, reference being made to the accompanying drawing, in which is illustrated an embodiment thereof. In this drawing,"

Figure 1 is a section taken through a fire box of a furnace suitable for a water tube boiler. In this view the grate bars are shown in the closed position, the section being taken on the line 1 2, Fig. 3, looking toward the right.

F ig. 2 is a similar 'vieiY showing the grate bars in the dumping position.

' Fig. 3 is a top plan view of the front part of `the grate, illustrating the burner plate and the adjacent grate bars, the parts being shown on a larger scale than in Figs. l and 2.

Fig. t is a cross section taken through one of the grate bars on the line d-Jl, Fig. 3.

Fig. 5 is a side elevation partly in section of the shaking lever' and its supporting bracket.

Fig. 6 is a section taken on the line 6-6, Fig.- 5.

Fig. 7 is a fragmentary sectional view ofl the front part of the furnace being similar. to Figs. l and :2 but shown on a larger scale.

Fig. 8 is a section taken through. a middle trunnion bar and its cooperating hller bar, thesection being indicated by the line S-8, Fig.' 3.,

lThe same reference characters indicate the same parts in all thev views.

Let the numeral 5 designate the fire box;

6 the ash pit; 7 the bridge wall and 8 the grate of a furnace. As illustrated in Figs. l and 2 it is yassumed that the furnace is employed with a water tube boiler, a num' As illustrated in the drawing the grateA bars which Yare designated by the numeral 10, are transversely arranged, being pro-i fui vided withtrunnions 12 which engage sockets formed 'in a side trunnionbar 13 and a middle trunnion bar 14. The middle trunformed in the top 'of the trunnion bar, the

web of the trunnion bar having a perforation 20 which registers with perforations in the U-strap, a securing pin 21 being employed to connect the U-strap with the trunnion bar (see Fig. 3). By virtue of this construction the grate bars are readily removable, as it is only necessary to disconnect the filler bar from the ,middle trimnion bar whenever it is desired to remove a crate bar, since when one end of the grate Bar is re# leased, the trunnion at its opposite end may be drawn out of the corresponding socket in the side trunnion bar 13.

Each grate bar 10 is provided with a' downwardly .extending lever arm 22 having a perforation 23, adaptedto be connected by means of a pin or bolt 24 with a rod 25 having an extension 26 passing through an opening 27 in the front wall of the furnace, the forward extremity of the rod being pivotally connected as shown at 28 with the lower extremity Vof a shaking lever 29, the

latter being fulcrumed onr a bracket 30 byV means of a pin 31 threaded at its opposite extremities to receive nuts 32, the said pin passing through registering perforations formed in the lever and bracket. -The upper part of this lever through which the pin 31 passes, as illustrated in the drawing is circularrin shape and designated by the nu- Y the fact that thewalls of the rings 50 and meral 33.l Y

vThis lever is provided on one side with a ycircular socket 34 adapted to receive a counterpart diskL or ring 35 formed ony the Y bracket 30, whereby the lever yis accurately.y

guided4 when actuated for grate shaking purposes. This part 33 ofthe lever is provided with two ytaper sockets 36 and 37 adapted to receive a handle 38 whenever it is desired to manipulatethelever forgrate shaking or kdumping purposes. The socket 36 which lis nearer the front wall of Ythe furnace, is used when it is desired to shake the grate. In this event the handle cannot be moved far enough forwardly for dumping purposes. lhenit is desired to dump the grate, the handle is placed in the socket 37 which permits 'suiiicient range of movement for the purpose as indicated by the two positions of the lever and handle in Fig.

5. The circular part 33 ofthe lever is provided with a perforation 39 adapted to register with a number of perforations'40 formed in the part 41 of the bracket 30, whereby the leverv may be locked in the desired positionv by the employment of a removable pin 42 having an eye 43 with which a chain 44 may be connected for retaining the pin in place in suitable proximity to the lever. The bracket 30 is provided with a flange 45 which fits the front wall of the furnace and is'secured thereto by bolts 46 or other suitable fastening devices, Ynuts 47 being applied to the bolts for fastening purposes. 'Y

The body portion of each grate bar is provided with an opening 4S surrounded by .an outer beveled surface 49,'this surface being inwardly inclined from the top of the bar. Within this opening is placed a ring 50 having correspondingly beveled inner and outer surfaces and spaced from the body of the bar lexteriorly by lugs 51 forming elongated openings 52 between the ring and the bar. Hthin this ring is located-,a central disk member 59 having an outer beveled surface parallel with the adjacent surface of thering and spaced therefrom by lugs .53 forming inner openings 54 for the passage of air from the ash pit'upwardly through the grate into the re box.l Extending across each opening 48 and within the same, is a cross bar 55 whose extremities enter the acent part of the grate bar and are cast therein. The center of this bar 55 is perforated asV shown at 56 to receive a stud bolty 57 whichv is cast in the disk member 59, the shank ex-V tending through the opening 56, a nu't58. being applied to its lower extremity forsecuring purposes. By virtue of this construction the disk and ring members ofeach grate bar are secured in place, but are readily removable whencver occasion may require.

By virtue of the beveled surfacesr surrounding the grate bar openings, and by virtue of disks 59 are parallel therewith, the openings or perforations 52 constitute passages which are outwardly inclined from Vtheir lower extremities, -thus introducing the air into the fire box in streams or currents which intersect a short distance abovethe upper surface of the grate,'thus causing an advantageous intermingling of the air with the fuel on the grate. Y l Y Forward of theportion of the grate composed of the grate bars 10, is located. a transversely arranged burner plate 60 which is inclined downwardly fromV the inner surface of the front wall of the furnace. The forward extremity of this'plate is equipped with trunnions '61 `which engage sockets formed respectively in the side trunnion bar.

13 and the middle trunnion bar 14 (see Fig. 8). This plate 'is normally supported by a transversely arranged block 62 whose eX- tremities slidably engage ledges 63 formed on the trunnion bars 13 and 14. Connected with this block 62 is a rod 64 which extends through an opening 65 formed in the front wall of the furnace beneath the fuel opening 7 6. The outer extremity of this rod 64 is pivotally connected as shown at 75 with a manipulating lever 66 which is fulcrumed at its lower extremity as shown at 67 on a stationary lug 68. When it is desired to drop the burner plate to facilitate the removal of clinkers or ash, the supporting block 62 is moved forwardly as indicated by dotted lines in Fig. 7.` In this event the burner plate will drop to the position indicated by dotted lines in the same view, whereby a relatively large opening forward of the Y grate proper is formed,'said opening being of suliicient size to permit the passage of the largest clinkers. By moving the lever 66 to the forward or full line position in Fig. 7, the burner plate supporting block 62 will be moved rearwardly and the said plate restored to its normal position.

The burner plate is provided with openings and ring and disk members which are substantially the same as the openings 48 and the ring disk members 5() and 59. Hence these corresponding features of the burner plate will be designated by the same reference characters as in the grate bars (see Fig. 3). As shown in this view the burner plate for each section of the grate, is provided with a Vforwardly located set of openings 48 together with corresponding rings and disks 50 and 59; while forward of these openings 48, a set of elongated perforations 69 is formed. The openings 48 and perforations 69, serve for the entrance of air into the fire box from the forward portion of the ash pit.

From the foregoing description it is believed the construction of my improved shaking grate will be readily understood. It

` is assumed (see Fig. 3) that the grate as illustrated in the drawing will consist of a number of sections each section being composed of a single burner plate 60, a number of grate bars 10 located in the rear thereof, a shaking lever 29 connected in operative relation with the grate bars of thev section, and a single lever 66 for adjusting the block which supports the burner plate. Hence where the grate is composed of more than one of these sections there must be at least one middle or intermediate trunnion bar 14 and two side trunnion bars 13 though only one of these side bars is illustrated in the drawing (Fig. 3), one side of the grate including the right-hand side trunnion bar being broken away. lt must be understood that two side trunnion bars are employed,

since this would be necessary, if the grate consisted of a single section only and the intermediate trunnion bar or bars were dispensed with. However as both side trunnion bars must be substantially identical, it is not considered necessary that the grate should be illustrated to disclose both of these side bars.

Assuming that the grate is assembled as heretofore described, when it is desired to shake the same, the handle 38 which may be co-nsidered as removed after each shaking act, is inserted in one of the taper sockets. If it is only desired to simply shake the grate, the handle will be placed in the socket36 while if it is desired to dump the grate, it will be placed in the socket 37. It will be understood that when the shaking vlever is in the position shown by full lines in Fig. 5, that the grate is closed whereby the fuel engaging surfaces of the bars are in the horizontal position and t closely together (see Fig. 1). New if it is desired to simply shake the grate the handle 38 will be inserted in the socket 36 in which event the shaking lever when at its forward limit of movement would occupy approximately a position midway between the positions in.- dicated by full and dotted lines in Fig. 5; and after the shaking is completed, thegrate bars would be restored to the position shown in Fig. 1. Again if it is desired to dump the grate or throw the grate bars to the position shown in Fig. 2, the handle will be inserted in the socket 37 (see Fig. 2). In this event the handle will be permitted t0 move forwardly a sufhcient distance (see dotted lines in Fig. 5), to throw the lower arm of the lever 29 also to the dotted line position in the same figure, when the grate bars will be in the dumping position indicated in Fig. 2 where the handle 38 is shown in full lines in the position for dumping purposes. When the grate bars are in the dumping position, if there are any clinkers or other material too large to pass through the openings between them, the supporting block 62 for the burner plate 60, may be moved forwardly (see dotted lines in Fig. 1), allowing the burner plate to drop downwardly far enough to make a sufficient opening for the removal of the largest clinkers. This supporting block 62 is shifted through the instrumentality of the lever 66 and the connecting rod 64 as heretofore explained.

Attention is called tothe fact that the adjacent edges of the grate bars 10 t closely together at the top making the grate practically air tight at the grate bar joints. One of the adjacent surfaces of each grate bar is offset a short distance below the top as shown at 80, leaving what I term a grinding strip 85 above which is advantageous in breaking up clinkers. Further the face of this strip which bears against the adjacent bar may be ground toform a tight joint, so that nok air can pass through the grate 'at these joints. The advantage of this construction is that no air can pass through the grate except where the openings 48 are located and these openings may Vbe .controlled through the medium of the removable ring and disk members, with absolute accuracy.

This is exceedingly important since it isV highly Ydesirable to permit/the passage only of such volume of air as is required forcembustion purposes. The passage, of any greater volume of airthrough the grate is f disadvantageous since it cools the furnace 15' and :to this extent retards eiiiciency.

V1n further explanation of the ring andV disk construction for controlling the pas-v sage of air through the openings V48 of the `grate bars, it should be stated that the spacing lugs 51 andV 53, overlapthe adjacent parts at the top and are'cuntersunk in Vrecesses formed in the body 'of the bar and in the ring respectively'. V f' Y The grate bars may besaid to'be eccentrically trunnioned, since their axes are located nearer the lower than the upper or fuel supporting'surfaces of the bars when thelatter are in the normal or fuel support ing position (see Fig. l). By virtue of this Copies of this patent may be obtained for termediate bar being composed ofa bodyV member having sockets open at the top :to receiverthe 'grate bar journals, and a removableV iiller member applied tothe top oi' the body member and having part sockets for r the grate bar trunnions, and means for removably securing the liller member in place, saidy last named means comprising Ustraps passing throughregistering openingsy in the two members of the bar, and a retaining pin passing through registering perforan tions formed Vin the body member and the arms of the strap. i

In testimony whereof I aiiiX my signature' in presence of two witnesses'.

Tanni/IAN R. WEBER.

lVitnesses :v i Y GRACE HUsToN, A. EBERT OBRIEN,

ve cents each, by addressing the Commissioner of Patents, Washington, D. C.

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