US1552083A - Coal-feeding mechanism for automatic stokers - Google Patents

Description

Sept. 1, 1925. R s RILEY ET AL l 1,552,083

COAL FEEDING MECHANISM FOR AUTOMA'IICI STOKERS Filed Feb. 19, 19214A I BY i ,-MJ Y WAHM/VEN 4INVENTOR Patented Sept. l1, 1925.

UNITED STATES j PATENT oFElcE.

ROBERT SANFORD RILEY AND IRVING A.

ASSIGNORS TO SANFORD RILEY STOKER COMPANY, OF WORCESTER, SETTS, A CORPORATION OEMASSACHUSETTS.

TAYLOR, T WORCESTER, MASSACHUSETTS,

MASSACHU- CoAL-FEEDTNG MECHANISM ron AUTOMATIC sToxEBs.

Application tiled February To all whom t may concern.' A

Be it known that we, ROBERT SANFORD RILEY and IRvING A. TAYLOR, citizens of the United States, both residing at Worcester,

in the county of Worcester and State of Massachusetts, have invented a new and useful Coal-Feeding Mechanism for Automatic Stokers, of which the following is a specication. l

This invention'relates to the coal feeding "mechanism of an automatic stoker and particularly to certain features of construction by which the expense occasioned by wear and corrosion of the` parts may be materially y reduced.

In -the usual automatic Stoker, particularly of the underfeed type, the coal is fed from the bottom of a magazine or hopper by means ofI a slowly reciprocating ram or I piston. The sliding movement of the piston over the bottom of the hopper causes relatively rapid wear of the parts. The sharp particles of coal caught under the piston scrape and cut the'metal surfaces which are then easily corroded by the dilute acids always found in moist coal and which are forced out of the co'al during the feeding operation by the pressure of theA piston thereon. It is one object of our invention to provide aA construction in which the wornj' parts may be easily and cheaply replaced.

Another object is to provide a #convenient and. efficient construction for retainin a piston packing ring in position in the cy inder which supports and guides thel piston. In one `form of our invention we also provide a removable lining sleeve for the cylinder as well as a lining plate for the bottom of the hopper.

Our invention further relates to arrange- 'ments and combinations of parts'which will be hereinafter described and more articularly pointed out in the appended c aims. '45 Two forms of our invention are shown in the drawings in which Fi 1 is a vertical sectional 'view of a coal hopperA and cylinder showing one form of our invention; v

'5 Fig. 2 is a similar view showing a modification thereof;

Fig. 3 is a partial sectional elevation taken along the line Figs. 1 or 2; and

19, 1921.- Serial No. 446,285.

Fig. 4 is a transverse sectional .elevation taken along the line 4--4 in Fig. 1. 55

Referring to the drawings, we have shown a portion of a coal hopper 10 and a cylinder 11 connected thereto or forming a projection therefrom. A piston 12 is mounted to slide in the cylinder 11 and may be ac- 60 tuated from a crank pin or eccentric 13 with which it isconnected b a piston rod 14.

' The parts thus far descri d are of the usual type and in themselves form no part of our present invention. 65

The cylinder 11 in Fig. 1, however, is made of somewhat greater internal diameter than is usual and a lining sleeve 15 and lin-'- ing plate A16 are removably mounted in the cylinder and hop erAto support ythe sliding piston 12. The s eeve 15 and' plate` 16 may conveniently beformed as sections of stand- Aard 4size tubes or pipes which are ysufliciently accurate in size for this purpose, particularly in view of the preferred use of a. packing ring 17 which encircles the piston and is y,positioned between the adjacent ends of th sleeve 15 and the plate 16.

This packing ring 17 is referably formed' vas a one-piece split meta ring. closely en- 80.

gaging the piston and reventing the coal from working back 1into the cylinder bearing. t 1

The sleeve 15 may be secured in the cylinder in any convenient manner, as by screws 18 at the bottom and a rivet or screw 19 at the top of the cylinder. The plate 16 may be similarly secured by screws 20 and bolts 21 eitherof which may be at times omitted.- A screw 22 may also be used to prevent an- 90 gular displacement of the ring 17 The construction shown in Fig. 2 is substantially the same as that shown nfFig. 1, with the exception that the c linder 11a is made of the correct interna loosely :[it the piston 12, so that the lining sleeve 15 ma be omitted. The lining plate 16 is forme as previously described and serves the same purpose.

It will be noted that the lining plate 16 is out away along/the dotted line a so that the upper portioni thereof is open to com- `municatefreely with the hopper 10 and that only a small portion is of the full cylindrical n form. A

A Having thus describedour mventlon. the

diameter to 0x5` 25 curs the piston may be readily replaced at (Y thereon. -When the plate becomes uses and advantages thereof will be readily apparent. The lining platev 16 covers the bottom portion. of the hopper 10 and receives the wear and corrosion due to "the mechanical and chemical action of the coal an objectionable extent it is easily removed by loosening the screws 2O or bolts 21, and a newlining plate maybe substituted'therefor at sli ht expense, at the same time renewin t e packing rin 17 if desirable. This orm of our invention is found very satisfacto as only. a relatively small amount o wear occurs in the cylinder itself, particularly when the packing ring l] is used, as this preventsthe coal from workin backward into the cylinder. Under certain conditions, however it may be desirable to make use of the additional lining sleeve 15 which permits the entire supporting structure upon Iwhich the piston slides to be readily renewedat slight expense.

It is found in practice that the piston wears much less rapidly than the'surface upon which it slides,.but if such wear ocsmall expense.

Having hus described our invention, it will be evident that changes and modifications can be made therein byy those skilled in the art within the spirit and scope thereof as setforth in the claims and we do not wish to be otherwise limited to the details herein disclosed but what we claim is 1. In a Stoker, a coal hopper having a partially cylindrical bottom portion, a

cylindrical coal feeding piston slidable over said cylindrical bottom portion, said hopper having an outwardly extended cylindrical sleeve forming a bearing for said piston, and a separate segmental removable lining plate covering the cylindrical bottom portion of said'hopper and supporting the inner end of said piston as it is advanced intosaid hoppen 2. In a st oker, a coal hopper havin a partially cylindrical bottom portion, a cy inorn to` drical coal y feeding piston slidable over said cylindrical bottom portion, said hopper. hav-' hopper, said drical coal feeding piston slidable over said cylindrical bottom portion,` said hopper having an outwardl extended cylindrical sleeve forming a aring l"for said piston,-

and a separate segmental removable lining plate covering the cylindricall bottom portion of said hopper and supporting the inner' end of said piston as it is advanced into said hopper, said late being cut from a section ofy pipe loose' y fitting said piston and being secured to and directly supported by the hopper bottom.

4. In a Stoker, a coal hofpper; a'cylinder communicating with the lower portion of said hopper, a piston slidable in said cylinder, a removable lining sleeve fork said cylindcr, a removable lining plate for the lower portion of said hopper, and a packing ring for said piston disposedbetweenthe adjacent ends of said liiiin sleeveand plate.

5. In a Stoker, a coalIi communicating with the lower portion of said hopper, a piston slidable in said cylinder, a removable lining plate loosely fitting said piston and covering the bottom of said ,hopper to protect the same from wear and corrosion, and a packing ring for said piston held from axial movement in said cylin- Ider toward said hopper by said'removable lining plate.

In testimony whereof we have hereunto' aflixed our signatures.

. ROBERT SANFORD RILEY.

IRVING A. TAYLOR.

opper, a cylinder 50 for said piston, `and a l

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