US1449223A - Cleaning device for excavators - Google Patents

Description

Mar, zo, i923. 11,449,223.

G. H. GREIIVIAN.

CLEANING DEVICE FR EXCAVATORSJ FILED NOV. I4 I92I Patented ii/lar. 261i, T1923.

man y veri c GEORG-E H. GREEMAN, F GARNEEL, IOVJ'A.

CLEANING`DEVICE FOR EXCAVATORS.

T 0 all whom t may concern Be it known that I, Grenen H. Giannini?,

a citizen of the United States, residing at Garner, in the county of Hancock and State of Iowa, have invented certain new and useful improvements in Cleaning Devices for Excavators; and l do hereby declare the .following to be a full, clear, and exact description of the invention, such as will enicable others skilled in the art to which it appertains to make and use the same.

My present invention provides an improved cleaning device or scraper for excavators of the power-driven type wherein excavating devices, variously designated as shovels, buckets or spades, are employed.

Cleaning devices for the above purpose have generally been spring-pressed or yieldinglyk mounted to prevent breakage of the machine elements when largev rocks or other hard materials are picked up. Most frequently, such cleaning devices or scrapers have been spring-pressed back to normal position by movement reverse from their yielding or rock-cleaning movement; but sometimes, the cleaning devices or scrapers have been held in position by shearing pins., which would give away before the machine elements would break. The first noted arliti resisting force in the cleaning device, or rather, in its spring, would increase throughout its rock-clearing movements, and the second noted structurewas objectionable because it required the cleaning device or scraper to be re-set by hand after each yielding-action.

in accordance with my present invention, I provide a rotatable cleaning device or scraper that exerts maximum resist-ance to movement when in its normal position, that is released by its initial movement from normal position, that thereafter moves freely to re-set position, and that will be automatically 11e-set by continuation of its rotation in the same direction in'which it is forced from normal position. This improved cleaning device, illustrated, is especially designed and particularly adapted for use in connection with excavators or ditchers of the type disclosed and claimed in my prior Patent #1,287,675, of date December 17, l98, entitled Excavator, and in this form, involves additional features of novelty; but, obviously, the inhere rangement was objectionable because thel vention is capable of much more extended use.

Alin the accompanying drawings, which illustrate the invention, like characters indicate like parts throughout the several views.

Referring to the drawings:

Fig. l is a fragmentary side elevation, with some parts sectioned rand some parts broken away, showing the application of my ,improved cleaning device to a ditcher or excavator of the character above indicated;

Fig. 2 is an enlarged fragmentary horizontal section taken approximately on the iine 2 2 of Fig. l, but with some parts in full; y

Fig 3 is a fragmentary section taken approximately on the line 3-,3 of Fig. i;

Fig. 4 is a perspective showing` the righthand scraper-supporting bracket; and

Fig. 5 is a perspective showing the lefthand scraper or rotary element of the cleaning` device.

Cf the parts of the excavator, in so far as they are shown, the numeral 6 indicates a horizontal portion of the framework to which is journaled one of the transverse conveyor shafts 7, which, as shown, carries a polygonal sprocket wheel 8. rfhe numeral 9 indicates a heavy sprocket chain of the link beit type that runs over the sprocket 8 and over co-operating and driving means, not shown. Certain of the links of the chain 9 carry outstanding arms l0, to the flanged outer ends of which excavating devices herein designated as spades 1l are rigidly secured. r)These spades are curved on such lines that they are approximately concentric to the axis of the shaft 7 while passing` around the same. The spade-carrying arms l0, transversely of their plane of movement, are narrow, and within their plane of movement have sufficient extension to give desired strength.

In this preferred arrangement, the cleaning device comprises two scrap-ers obliqucly set one on each side of the plane of movement of the arms l0. Each scraper has a plurality of blades or operative ends. in the preferred arrangement, each such scraper comprises a'double-ended arm 12 provided at opposite ends with "tf-pointed scraper biades i3 preferably slightiy curved in the plane of the arm. At their ventral portions, the scraper arms l2 are provided with sleevearound the bolt and is compressed be-l 'tween the washer 22 and a washer 24 that like hubs 14 vj ournaled on bolts 15 that work freely through the oblique faces 16 of supporting brackets 17 that are bolted Vor otherwise rigidly securedy to the frame 6. 0n

their oblique faces, the brackets k17 are formed with lannular flanges 18 and with diametrically opposite stopl lugs 19. opposite sides of its hub 14, each scraper arm 12 is provided with stop lugs 42Oy that arev adapted to engage the stop lugs 19 of the brackets 17 and thereby stop the scraper in its operative position shown in Fig. 1. The lugs -19 and 20 are beveled preferably on both sides, foran important purpose which will presently appear. A j

At its extended end, the pivot bolt 15 is provided with a nut 21 and co-operating' washer 22. A coiled spring 23 is placed is placed directly against theend ofthe hub 14 and is adapted to engage the adjacent face flange 16 of the co-operating bracket 17. A washer 25 is vshown as placed between the head of the bolt 15 and the adjacent face v of the scraper arm 12. l

Here it is importa-nt to note that Lthe sleeve-'likehubs 14 of the. scraper arms 12 k.are of' such length that when the scrapers are in normal position or in any other position, except when the lugs20 are being forced over thelugs 19, the springs 23 will press the washers 24 against the hubs 14 but will not frictionallypress the arms 12 againstthe supporting brackets. Hence, the Scrapers will freely move except when the stop lugs 19 and 20 are in contact.

The tension of the springs 23-will be so ladjusted that the beveled stop lugs 19 and 40"' 2O will hold the scrapers in operative positions, against all such forces as will be exertedA in the normal scraping or cleaning action, such as required to dislodge from the j excavator spades or blades all sticky earth,

and the like. lf, however, a rock of considerable size should be carried against one or the other of thescrapers and should exert a force thereon somewhat closely approachn ing the breaking point, then the beveled engaging faces of the lugs 19 and 20 will cause the scraper arms to move laterally against the tension of the springs 23, and thus the lugs 20 will be caused to ride over the lugs 19 and the-engaged scraper arm will move" rotatively and permitthe rock to pass. The

rock, in passing, will turn the opposite end of the scraper arm into the path of movement of the load on the next excavating spade so that the following load will complete the movement ofthe scraper into operative position where the lugs. 19 and 2O again become engaged.

'Obviously with the bevel-ended scraper arm, the scrapers will be given half rota-1 tion for each tripping or releasing moveinfluence the tripping action. Otherwise stated, the greater the bevel ofsaid lugs, the

greater mustbe the tensionv of the springs k23 to set the Scrapers totrip under any desired force. 1

The scrapers or trated in the drawings are in a veryvnovel `relative arrangement for'the particular application illustrated, and, in practicefhas been found .very highly efficient for 'such' purpose. However, theinvention isV capable .cleaning devices illus-l se l of many modications to adapt themk fory n :other or different applications or uses.

The rotary scraper arms illustrated in the.; drawings are nmade in rights andv lefts and the` lugs 19'and20 are 'beveled on both sides so that, by transferring or interchanging said rotaryscraper arms, they may be used regardless of the direction in which theendz less conveyor belt and its excavator spades -or devices arearranged to'travel. A n 'l What I claiml is: 1 n 1. An excavator cleaning device comprising a rotary member havinga plurality of projecting Scrapers, and a yielding stop adapted to be overcome by excessive pressure to Vpermit said scraper-equipped member to rotate in a constant direction from one operative position to another.

2. The construction defined vin claimflin which said scraper-equipped member is free for rotation except when nstopped in anoperative position. Y

3. The combinationwith an endless excavating belt, of acleaning device therefor comprising a rotary member equipped withk a plurality ofscrapers, co-operating'stops.

for stopping said `rotary member' with a scraper thereofin operative position, and a stops co-active but permitting said stops to pass'under excessive pressure.

which said spring tension device is held out of action except wheiione of said Istopsis forced past the other.r

' 5. An excavating belt in combination with a cleaning device comprising av bearing bracket, a .bolt y passed therethrough, a scraper arm p'ivoted on said bolt-'and having a plurality of projecting scraper blades,

said arm having a hub projecting slightly"- through said bracket. said arm and bracket having co-acting bevel stop lugs, and a spring tension device yieldingly holding said 4. The construction defined in claim'` 3 `in i spring anchored to said bolt normallT pressing against the hub of said arm and arranged to re-act upon said bracket when seid stop lugs are being forced the one past the other.

6. The construction defined in claim 5 in which said stop lugs are beveled on both sides thereby making the cleaning device reversible in respect to the operative direction of rotation. v

7. rlhe combination with an excavator bel provided with projecting arms, and excavating spades or blades carried by and projecting on both sides of the outer ends ox said arms, of a cleaning device comprising two rotarj,T scraper arms obliqiiely set on opposite sides of seid belt and each provided with a plurality of projecting scraper blades arranged to work in the angles between said arms and spades, said arms being rotatable in a constant direction, and yielding stop devices for intercepting rotation of said arms and to stop the same with certain of the Scrapers thereof in operative positions.

ln testimony whereof I aiiiX mv signature. 25

GEORGE H. GREIMAN.

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