US1276005A - Chain grizzly. - Google Patents

Description

J. C. BARR.

CHAIN GRlZZLY.

APPLICATION FILED MAY27. I916- 1,276,005. Patented Aug. 20, 1918.

I7 III l I UNITED STATES PATENT OFFICE.

JOSEPH C. BARR, OF RIVERTON, MINNESOTA, ASSIGNOR 'IO ALLIS-CHALMERS MANU- FACTURIN G COMPANY, OF MILWAUKEE, WISCONSIN, A. CORPORATION OF DELA- WARE.

CHAIN GRIZZLY.

Specification of Letters Patent.

Patented Aug. 20, 1918.

To all whom it may concern.

Be it known that I, Josnrn C. BARR, a citizen of the United States, residing at Riverton, in the county of Crow Wing and State of Minnesota, have invented a certain new and useful Improvement in Chain Grizzlies, of which the following is a specification.

This invention relates to improvements in the construction of screening or separating devices, and is particularly applicable to chain grizzlies for screening relatively coarse materials.

An object of the invention is to provide a grizzly which is simple in construction and efficient in operation. One of the more specific objects is to provide a chain grizzly of maximum capacity at minimum cost of construction and of maintenance. Another specific object is to provide means for effectively preventing clogging of the screening openings of a grizzly. A further specific object is to provide a device which will produce uniform separation of the coarse material from the fines. Still another specific object is to provide a grizzly which is entirely automatic in its operation.

These and other objects are accomplished primarily by forming the grizzly of a series of substantially parallel endless chains, adjacent chains being movable at different speeds. The chains are movable simultaneously from a common source of power and are associated with cooperating structure in such a manner that a simple and highly efficient grizzly is produced.

A clear conception of an embodiment of the invention may be had by referring to the drawing accompanying and forming a part of this specification in which like re erence characters designate the same or similar parts in the various views.

Figure 1 is a fragmentary top view of a chain grizzly embodying the invention.

Fig. 2 is a fragmentary transverse vertical section through a chain grizzly and associated structure.

Fig. 3 is a transverse vertical section through the chain grizzly, the section being taken along the line IIIIII of Fig. 1 looking in the direction of the arrows, and the chains having been omitted.

Fig. 4 is an enlarged transverse vertical section through one of the end sprockets of the grizzly.

The chain grizzly disclosed comprises a series of relatively short chains 1 and a second series of longer chains 2, arranged substantially parallel to and alternating with the short chains 1 of the first series. The chains 1, 2, are formed as endless elements comprising alternate vertical and horizontal links, the former of which form upwardly extending projections and engage end sprockets or wheels 21, 22, respectively. The wheels 21 are of somewhat smaller external diameter than the wheels 22. The wheels 21, 22, are secured to the shafts 11, 12, by means of keys 23 or other suitable fastening devices. The front shaft 11 is mounted in suitable bearings 24 secured to the main frame 17, and as disclosed is rotatable by any suitable driving means, not shown. The rear shaft 12 is rotatably mounted in bearings 25 secured to the main frame 17, and may also be employed as a driving shaft if so desired. The upper portions of the chains 1, 2, intermediate the shafts 11, 12, are vertically supported by means of idler chain wheels 4 which are rotatably mounted upon idler shafts 14 supported in bearings 5 secured to the mam frame 17. The lower portions of the chains 1, 2, intermediate the shafts 11, 12, are verticall supported by means of idler chain whee s 4 rotatable upon shafts 14 carried in bearings 15 supported by brackets 16. The supports for the upper portions of the chains 1, 2, are greater in number than those for the lower portions. The idler chain wheels 4 are preferably formed alike, and are freely rotatable upon their supporting shafts 14, Elongated bars 13 are mounted upon the shafts 14 between adjacent idler chain wheels 4, and extend from one end of the grizzly to the other.

The upper edges of v these bars 13 are below the upper extremities of the vertical chain links, lying substantiall in the plane of the upper surfaces 0 the horizontal chain links, see

The side beams 6 located above the chains 1, 2, form a screening chamber 3 above the upper chain-sections of the grizzly and also form supports for the rails 10 upon which the dumpmg ear 9 is adapted to travel. A discharge hopper 7 is located below the grizzly in vertical alinement with the screening chamber 3. A crusher 8, of any suitable form, is located at the extreme end of the grizzly.

During the normal operation of the device the chains 1, 2, are moved in an anticlockwise direction as viewed in Fig. 2, by means of the power applied to either of the shafts 11, 12. The material to be screened is deposited upon the upper portions of the chains 1, 2, through the screening chamber 3, and is separated, the fine material passing through the spaces between adjacent chains and into the hopper 7, and the oversize being eventually delivered over the end of the grizzly to the crusher 8.

Due to the formation of the chain driving wheels 21, 22, of dilferent diameters, adjacent chains 1, 2, of the grizzly will travel at different speeds thereby continually shifting the material and causing it to distribute itself over and to pass through the grizzly more readily than if the chains were all travelin at the same speeds. The elongated bars 13 ocated between adjacent chains produce uniform separation by preventing large pieces of material from wed ing between and spreading the adjacent c ains to cause a relatively large through opening for the passage of material. The bars 13 in addition to reventing spreadin of the adjacent chains 1, 2, assist these chains in sup porting the weight of the charge of the material. By havin the upper portions of the chains 1, 2, whic are directly adjacent the screening chamber 3 movable in substantially a horizontal plane, the material will tend to more uniformly distribute itself over the entire screening area of the grizzly than if the upper portion of the grizzly were troughed or otherwise distorted. The projections afiorded by the vertical chain links, serve to rapidly advance the material along the rizzly and also agitate the charge, ther y producing a rapid screenin action.

W lie the grizzly has been disc osed as being formed of a series oi endless chains, it is not intended to limit the invention to such disclosure. It is however desirable to have the grizzly formed of endless elements, as the problem of driving'such elements is a relatively simple one.

It should be understood that it is not desired to be limited to the exact details of construction shown and described, for obvious modifications will occur to a person skilled in the art.

It is claimed and desired to secure by Letters Patent,

1. In combination, a plurality of spaced stationary material-supporting elements,

and movable conveying elements in the spaces between said stationary elements, one of said conveyin elements being movable at a difl'erent speed than that of another.

2. In combination, a plurality of spaced stationary material-supporting elements, and movable conveyin elements in the spaces between said.stat1onary elements and having projections extending upwardly beyond said stationary elements, one of said conveying elements being movable at a different speed than that of another.

3. In combination, a plurality of spaced stationary material-supporting elements, and movable conveying elements in the spaces between said stationary elements, one of said conveying elements'on one side of a stationary element being movable at a different speed than that of said conveying element on the opposite side of said stationary element.

4. In combination, a series of spaced parallel stationary material-supporting bars, and movable conveying chains in the s aces between said bars, one of said chains eing movable at a different speed than that of another.

- 5. In combination, a series of spaced parallel stationary material-supporting bars, and movable conveying chains in the spaces between said bars and having projections extending upwardly beyond said bars, said chains on opposite sides of each of said bars being relatively lon 'tudinally movable and being movable at di erent speeds.

6. In combination, a series of spaced parallel horizontal stationary material-supportmg bars, and movable endless conveying chains in the spaces between said bars and having projections extending upwardly beyond sald bars, said chains on opposite sides of each of said bars being movable at different speeds and alternate chains being movable at the same speed.

7. In combination, a series of spaced parallel stationary material-supporting bars, and movable conveying chains in the spaces between said bars and having projections extendin upwardly beyond said bars, one of said c ams being movable at a difi'erent speed than that of another.

8'. In combination, a pluralit of spaced lateraily uny'ieldable materia -sup orting elements, and movable conveying e ements n the spaces between said material-supportmg elements, one of said conveying elaments bein movable at a dilferent s said unyieldable elements, one of said eonthan that 0 another. veying elements being movable at a dif- 9. In combination apluralit of spaced ferent speed than that of another. laterally un ieldable materia -supporting In testimony whereof, the signature of 10 5 elements, an laterally ieldable movable the inventor is aflixed hereto.

conveying elements in tlle spaces between JOSEPH O. BARR.

It is hereby certified that Letters Patent No. 1,276,005, grantediAugust. 20, 1918, upon the application of Joseph C. Barr, of Ki'verton, Minnesota, for an improvement in Chain Grizzlies, were erroneously issued to Allis-Chalmers Manufacturing Company, as assignee of the entire interest in said invention, whereas said Let-tors Patent should have been issued to the inventor, said Barr, and Ame-Chalmers Manufacturing Company, said corporation being'mer of one-half interest only, as shown by the records of the case in this office; and that the s'aid Letters Patent should be read with this correction therein that the same may conform to the record of the case in the Patent Oflioe.

Signed and-sealed this 8th day of October, A. D., 1918.

' R. F; WHITEHEAD,

Acting Commissioner ofPa/imts.

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