US1125474A - Grate for mechanical stokers. - Google Patents

Description

P. M. CLARK. GRATE FOB. MECHANICAL STOKERS.

APPLICATION FILED SEPT. 11, 1911.

Patented Jan. 19, 1915.

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ATTORNEY THE NORRIS PETERS ca, EHOTO-LITHO., WASHING TON. D C

@NI STATES PATENT ()FFIQE.

FRANCIS MORTON CLARK, OF GARDEN CITY, NEW YORK, ASSIGNOR TO MULTIPLE- GRATE-BAR ENDLESS CHAIN STOKER COMPANY, A CORPORATION OF NEW YORK.

GRATE FOR MECHANICAL STOKERS.

Application filed September 11, 1911.

To all whom it may concern:

Be it known that I, FRANCIS MORTON CLARK, a citizen of the United States, residing at Garden City, in the county of Nassau and State of New York, have mvented a certain new and useful Improvement in Grates for Mechanical Stokers, of which the following is a full, clear, and exact description.

My invention relates to improvements in grates for mechanical stokers of the endless traveling grate type, in which the grate is mounted on endless conveyor chains carried on sprocket Wheels mounted in the fore and rear parts of the furnace.

The objects of my invention are to provide a grate composed of sections which shall be easily and conveniently attachable to and detachable from the conveyer chains and which sections,being exactly alike, shall be reversible and interchangeable; to pro vide a grate which may be extended to any desired breadth by the addition of further chains and sections or by substituting sections of difierent length, and which shall be economical to construct and operate; and to obtain such other advantages and results as may be brought out in the following description and claims. I attain these objects by the construction illustrated in the accompanying drawing, in which Figure 1 is a side View of the rlght hand end and a portion of the middle of a grate bar constructed according to my invention, showing vertical links of two chains in section; Fig. 2 is an enlarged end View of said grate bar, showing several links of the chain to which it is attached; Fig. 3 shows in plan a part of the right hand end of two adjacent bars; Fig. t is a similar view of two bars where sections join; Fig. 5 is an enlarged perspective of one of the links employed in joining grate bars to the conveyer chains; Fig. 6 is an enlarged perspective of a pin which is used to give stiffness to the grate bar where grate bar sections oin.

Each grate bar A, B, and so on through the series, is composed of two or more sections 5, 6 and so forth, and all grate bar sections are exactly alike. Each is formed with a web 7 and, in the form chosen for the purpose of illustration with staggered, intermeshing teeth 8, so as to be self cleaning.

Each grate bar section is provided at each Specification of Letters Patent.

Patented J an. 19,1915.

Serial No. 648,802.

end with a half-notch 9 and adjacent each end with a full notch 10. The notches 10, or a pair of half-notches 9 when two bar sections are joined end to end, form an opening of such dimensions as to easily receive the upper leg of a vertical link X of a chain XY. These notches are shown as being rectangular in cross section but it will be readily understood that they may be of any desired shape to permit of the use stated. Adjacent each end of each bar section and between half-notch 9 and notch 10, and also at the sides of notches 10 toward the middle of the bar and at like distances from said notches are formed holes 11 through the web 7 (preferably by drilling). Considering only one end of the bar section, the distance between centers of holes 11 is equal to the distance between centers of holes 1% in the shanks 15 of link L; and the center of the first hole 11 is at a distance from the end of the grate bar section equal to one-half the distance between the centers of holes 14.

i In the drawings I have shown only the right hand bar section and a portion of one of the intermediate sections, of which it will be readily understood as many as desired to give the proper width of grate may be employed. When, as is the case at the right of the drawing the section is to be an end one, the upper leg of vertical link X of the chain XY is placed in the notch 10. Then links L (shown in enlarged View in Fig. 5) are passed through the vertical link of the chain, one on either side of the web 7 of the bar section, and are secured in place by pins 12 inserted through holes 11 of the web and 14 of the links, and held in place by cotter pins 16.

If, as shown at the left hand side of Fig. 1, the chain is one of the intermediate ones, it is joined to the sections at their juncture. The link X fits in the opening formed by two half-notches 9 and the pair of links L pass through the chain links X and join the bar sections, the pins 12 fitting into the holes 11 nearest the bar section ends.

In order to give stiffness to the grate bare it is desirable that there be some connection between the sections other than the links L. In the drawings I show each section as provided at each end with a recess 17 and where sections are joined end to end, pins 18 are inserted in said recess 17 to give stiffness to the joint. While cylindrical recesses and pins are illustrated it is obvious that any form of detachable stiffening element entering correspondingly shaped recesses in the ends of the bar sections, may be employed Without departing from my invention.

In the specification and claims I have, for the want of a more descriptive word, re ferred to the cut out portion 9 as a halfnotch. By this term I intend to specify a recess, open on two sides, which recess alone is not sufliciently large 'to. receive a link of a conveyer chain but which will cooperate with a similar recess on an abutting section to form a recess of approximately the same size as the notches l0 and, like said notches 10, capable of receiving a link of a conveyer chain. The claims should'be c011- strued in view of the limitations given the term halfnotch in this paragraph.

lVhile I have illustrated a grate composed of intermeshing bars I do not limit myself to that particular form of bar as any of the well known types of bars may be employed without departing from my invention;

I do not claim to be the inventor of the generic idea of rendering a grate bar section interchangeable by providing near each end thereof means for attaching the section to a conveyer and elements of an attaching means adapted to cooperate with similar elements 011 an adjacent section, the first attaching means being adapted for use when the section is attached to an outside conveyer and the second attaching means being adapted for use when the section is attached to an intermediate conveyer, as such generic idea was invented by Harvey Iserman and is claimed in his copending application, Serial Number 648,745, filed Sept. 11, 1911. But I do claim to be the inventor of the specific means for carrying out that generic idea shown in this application.

Having thus described the invention, what I claim is 1. In an'endless traveling grate, a plurality of endless conveyer chains, a plurality of grate bars mounted transversely thereon, in combination with duplicate attaching links one on each side of said grate bars, said attaching links passing through the vertical links of the chains and being attached at each end to the exterior of the body portion of the grate bar. I

2. In an endless traveling grate, a plurality of chains having grate bars mounted transversely thereon, each grate bar being composed of a plurality of webbed grate bar sections joined end to end, and duplicate means which pass through the chains and are fastened one on each side to the web of the grate bar, for joining the sections one to another and attaching the grate bars to the chains.

'3. In an endless traveling'grate, a plurality of chains having grate bars mounted transversely thereon, each grate bar being composed of a plurality of. webbed grate bar sections joined end to end, and duplicate attaching means which pass through the vertical links of the chains and are fastened one on each side to the webs of the grate bars, the opposite ends of the attaching means being attached to diiierent abutting grate bar sections, for joining the' sections one to the other and attaching the grate bars to the chains.

4. In an endless traveling grate, a plurality of conveyer chains with grate bars mounted transversely thereon, each grate bar being composed of a plurality of longitudinally webbed grate bar sections joined end to end, each section having a plurality of holes transversely through its web, duplicate means passing through the chains and adapted to be attached to the ends of two abutting sections, and pins passing through the attaching means and through the holes in the webs of the sections.

5. In an endless traveling grate, a plurality of conveyer chains with grate bars mounted transversely thereon, each grate bar being composed of a plurality of webbed grate bar sections joined end to end, each grate bar section having at each end a halfnotch, a transverse hole, a full notch and a transverse hole, arranged in the order named from the end toward the center of the bar section, whereby each grate bar section is adapted to be used either as an end or an intermediate section, the chains and bar sections being so relatively located that the side chains are received into the notches adjacent the ends of the grate bar sections and that the intermediate chains are received into the space formed by two half-notches at the juncture of the grate bar sections, duplicate detachable links, on opposite sides of the web of the bar sections, passing through vertical links of the outside chains and attached to said bar sections by pins passing through the detachable links and the holes at one end of a grate bar section, and duplicate detach able links passing through vertical links of the intermediate chains and attached to abutting grate bar sections by pins passing therethrough and through the end holes in said abutting sections.

6. In a grate for mechanical stokers, the combination with a plurality of endless chains, of grate bars mounted transversely thereon, said grate bars being composed of a pluralityvof webbed grate bar sections, each section having a half-notch at each end and a notch adjacent each end, whereby each grate bar section is adapted to be used either as an end or an intermediate section, the chains and bar sections being so relatively located that the side chains are received into sections, duplicate detachable links passing the notches adjacent the ends of the grate bar sections and that the intermediate chains are received into the space formed by two half-notches at the juncture of the grate bar through vertical links of the chains and pins passing through both detachable links and the web of a grate bar section for attaching Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents,

Washington, D. 0.

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