US1573816A - Chain grate - Google Patents

Description

Feb. 23 1926.

w. M. DUNCAN CHAIN GRATE Filed August 18, 1921 2 Sheets-Sheet l \\I Inventor.-

2 Sheets-Sheet 2 ill! INUBHZOI":

WM DDncan Feb. 23 1926.

W. M. DUNCAN CHAIN GRATE Filed August 18, 1921 reamed Feb. 23, teen.

WILLIAM M. DUNCAN, OF ALTON, ILLINOIS.

CHAIN GRATE.

Application filed August 18, 1921. Serial No. 493,198.

To all whom it may concern:

Be it known that I, IVILLIAM: M. DUNCAN, a citizen of the United States of America, anda resident of Alton, in the county of Madison and State of Illinois, have invented certain new and useful Improvements in Chain Grates, of which the following is a full, clear, and exact description, reference being had to the accompanying drawings, forming a part of this specification. 7

This invention relates to improvements in chain grates, the main object being to produce a chain grate adapted to receive very fine fuel without undue loss of the fuel at the draft passageways in the grate. In a chain grate, the grate links should be separated from each other to provide passageways for the admission of draft to the fuel. The'problem of admitting adequate draft and at the same time preventing free escape of fine fuel, is a difficult one that has never been entirely solved, and my object is to produce a chain grate from which these results can. be most effectively obtained.

In the preferred form of the invention, the flexible chain grate is provided with piv otally connected grate links having longitudinal baffle ribs which obstruct the fuel tending to pass through the grate. 30'

These baffle ribs are so formed that the draft can pass freely to the fuel, and they do not in any wayinterfere with the pivotal movevments of the links. Furthermore, the battles are so arranged. that any fine particles of fuel entering between the links Wlll be d1scharged when the llnks turn on their pivots,

so the links are repeatedlycleaned while the grate is in motion. 7

A further ob ect is to prevent free escape of ashes through the grate structures, and

.this is of course accomplished by the means for preventing free escape of fine particles of fuel.

A further ob ect is to provide an effectivemeans for preventlng the draft from flowinglengthwise of the grate at points beings wherein is shown the preferred embodiment of the invention. However, it is .tO be understood that the invention comprehends changes, var1at1ons and inodihcatlons which come within the scope of the claims hereunto appended. Fig. 1 is a top view, partly in section, illustrating several rows of grate links embodying the features of this invention, the section being in the plane of the pivot rods. Fig. II is aside elevation of the structure shown in Fig. I, some of the links being shown by dot and dash lines to illustrate the pivotal motion of the links.

Fig. III is a vertical section taken approximately on the line III-III in Fig. II.

Fig. IV is a vertical section taken approximately on the line IVIV in Fig. II, some of the parts distant from said line being omitted.

Fig. V is a perspective view showing one side of the new grate link.

VI is a perspective view showing the other side of the link.

The links shown by Figs. I, II, III and IV an be made exactly alike, and one of these links is shown by Figs. V and VI. I will describe one of the links and then point out the manner in which the several links cooperate with each other.

Each link is provided with a longitudinal battle rib it extending approximately from end to end of the link and projecting from the top margin of one of the side faces of the link. Each link also has a lower longitudinal baflie rib B extending from end to end of the link and projecting from the other side face thereof. Fig. IV shows that the rib B at one side of the link is lower than the rib A at the other side. Transverse grooves l are formed in the top face of the link, as shown most clearly by Figs. V and VI, and these grooves are continued down the side faces of the battle rib A. The lower portion of each link is provided with a pair of pivot receiving openings-2 (Fig. V) formed near the ends of the link. The bottom face of the rib A is provided with curved portions 3 coaxial with the respective openings 2, and the battle rib B has curved top faces 4: coaxial with these open ings. designates pivot rods passing through the openings 2, so as to pivotally connect the several links.

lVhen the links are assembled, as shown by Fig. IV, the baiiie ribs i'f-i overlap the ribs I5, and the bottom face of each rib A is separated from the top face of a lower rib B. Each rib B is separated from the side face of the next adjacent link, so the draft can "links.

pass'fr'eely between the links and escape to th fuel supported on the top faces of the links.

Figs. I and 11 show that the links are arranged in straight rows whichare pivotally connected by the rods 5 to provide a flexible chain grate. For reasons well understood in this art, the links are movable about the axes ofthe pivot rods as suggested by the dot and dash lines in Fig. H. and since the lapped faces of the baffle ribs A and B are coaxial with the respective pivots, it will be understood that these ribs donot in any way interfere with the pivotal movements ofthe The baffles A in each row of links overlap the battles B in the next adjacent row so asto obstruct fine particles of fuel, or ashes, tendingto pass between the sides of the links. f In the grate structure I haveshown, the links ofadjacent rows are staggered relative to each other. as shown most clearly by Fig. I, so that the links in an interposed row are not in alinement with the links at opposite sides thereof. In other words, the longitudinal batl'le rib A of each link overlaps the baffle ribs B on two of the links in the next adjacent row, but the ribs are so formed that each link can turn freely on its two pivot rods 5.

I will now refer to vertically disposed battle ribs which impede air currents tendcal'batlle rib 8 extending from the longitudinal rib A. to the lower edge of the link. The opposite side of each link is provided with a vertical battle rib Slextending from the rib-'3) to the lower edge of the link. \Vhen the links are assembled, one of the vertical ribs 8 lies adjacent to one of the ribs S), as shown by Figs. I and Ill, and these adjacent ribs lie betwen the ends of two links. They prevent the fuel from dropping between the adjacent ends of the links, and they impede airv currents tending 1 Each (Figs. lll'and V) which extends into a recess at the top of a I'll 9. Each rib 8 1s thus extended to overlap a rib 9, and the overlapping portions lie immediately below the space between the ends of two links. The ribs 8 and 9 on anyone of the links lie midway between the ends of the links, and these ribs are extended from the several rows'of links, so that any two companion ribs 8 and 9 extend across'an interposed row of the links at'points directly below the adjacent ends of two linksin the interposed row.

I claim: "1. A flexible chain grate comprising rows of pivotally connected grate links, each of tudinal said links having on one of its sides an u per longitudinal baliie rib formed at its top margin and extending approximately from end to end of the link, each link also having on its opposite side a lower longibafllej extending approximately from end to end of the link, the lower longitudinal batlleson the'links in one row being overlapped by the upper longitudinal bafile ribs on the links in-the next adjacent row, and said lower longitudinal batlies' being separated from the overlapping upper longitudinal battles to provide for the de- 7 livery of draft between the battles.

2. A flexible chain grate con'iprising rows of pivotally connected grate links, each of said links having on one of its ..icles an upper longitudinal baffle rib formed at its top margin and extending approximately from end to end of the link, each link also having on its opposite side a lower longitudinal baffle extending approxin'iately from end to end of the link, the lower longitudinal. battles on the link in one row being overlapped by the upper longitudinal baffle ribs on the links in the next adjacent row, each lower longitudinal baliie having a top face adjacent to but separated from the bottom face of an upper longitudinal battle rib, and said faces having curved portions approximately coaxial with the correspond ing connecting pivots. i

3. it'grate link having an upper longi tudinal battle at the upper edge of one of its side faces, and a lower longitudinal battle at the upper portion ofits other side face- 4. A grate link having anupper longitudinal bazllle at the upper edge of one of its side faces, and a lower longitudinal baffie at the upper portion ofits other side face, said link also having pivot-receiving openings,'and port-ions of said longitudinal baffles being approximately co-axial with the respective openings.

oil grate link having an upper longitudinal baffle atthe upper edge of one of its side faces, and a lower longitudinal baftie at the upper portion of its other side face, the lower portion of said link having pivot-receiving openings, said upper longitudinal baffle having bottom faces approximately co-axial with the respective openings, and said lower longitudinal baffie being provided with top faces approxi-' being staggered relative to each other so that the links 111 an interposed row'are not in transverse alinement with the links at opposite'sides thereof, the links in each of said rows being provided with transverse 7 battle ribs which extend between end port-ionsof the links man ad acent row, so

tions of the links in an adjacent row, so

as to impede air currents tending to flow longitudinally of the grate, the upper end of each of said baiiies being provided with a lateral extension overlapping another of said bafiles.

8. A chain grate comprising endless rows of grate links, the links of adjacent rows being staggered relative to each other so that the links in an interposed row are not in transverse alinement with the links at opposite sides thereof, the links in each of jacent ends of two of said links.

9. A grate link having oppositely disposed baflie ribs on its side faces, said baiile ribs extending from the lower margin of the link to the upper portion thereof, one of said ribs having a lateral extension and the other rib having a recess formed opposite to said lateral extension, said extension being adapted to extend into a recess in a rib of an adjacent grate link and said recess being adapted to receive an extension on a rib of an adjacent grate link when the grate link forms a part of an assembled grate.

10. A flexible chain grate comprising rows of pivotally connected grate links, the links of one row being provided with longitudinal bafiie ribs overlapping portions of the links in the next adjacent row, each of said links also having transverse bailles overlapping portions of the links in another row.

11. A flexible chain grate comprising rows of pivotall connected grate links, each of the links in one of said rows being provided with a longitudinal ballle rib formed at its upper margin and extendingapproximately from end to end of the link. and each link in the next adjacent row being provided with a longitudinal baffle rib at its upper portion overlapped by two of the longitudinal ribs of the other row, so as to prevent free escape of fuel between the links, each of said links also having a transverse baflle rib extending from its longitudinal battle rib to the lower margin of the link.

In testimony that I claim the foregoing I hereunto aliix my signature.

lVlLLIAM M. DUNCAN.

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