US1481602A - Excavator - Google Patents

Description

Jan. 22, 1924.

G.H.GREMANN EXCAVATOR Filed Nov.

Patented Jan. 22, 19211,

srnrssrarENr orrics,

GEORG-E H.

EXCAVATOKR.

Application filed November 5, 1920. Serial No. 421,898.

T all 'whom t may concern.'

Be it known that l, Geenen H. GnnrMANN,

` a citizen of the United States, residing at Garner, in the county of Hancock and State of lfowa, have invented certain new and useful Improvements; in Excavators;

and do hereby declare the following to be a full, clear, and exact description of the invention, such aswill enable others skilled in the art to which it appertains to make vand use the same.

My present invention relates to excavators of the type that are especially adapted for y digging, for example, drainage trenches or ditches in which to lay sewer, drain or other pipes, and generally stated, the invention consists of the novel construction and combinations of parts hereinafter described and defined in the claims. v e v In a sense, the present invention is inthe natureof, an improvement onvthe machine disclosed Aand claimed in my prior Patent- :,f'j:1,287,675, of date December 17, 1918, entitled llxcavatorf7 Primarily, the present invention is directed to improvements in the endless excavating mechanismV and is directed particularly to an improved arrangement of excavawith's'ome parts in diagram and with someA parts sectioned, illustrating my present invention;

Fig. 2 is a fragmentary view illustrating the novel action of one of the polygonal wheels on an 'excavating spade that is approximately in position to drop its load; and

Fig. 3 is a perspective illustrating the manner in which the spades are connected to the chain or endless carrier.

In Fig. l, the invention is illustrated as incorporated in a self-propelled excavator,

the parts of which may be briefly noted asv follows: The numeral 4 indicates a truck frame supported by front wheels 5 and by rear wheels 6, over which tread chains 7 are arranged to run. Through suitable mechanism, not necessary here to consider, kthe wheels V6 are driven from an engine 8 carried by the truck L1-. The numeral 9 indicates a transversely movable conveyor belt, which runsy over suitable rollers driven from the engine8 and adapted to deliver dirt at one side of the excavator in a well known manner. The numerals 10 and 11 indicate upeanrnrnnn, or enanas, iowa, nssre'nosiro GREIMANN erronea coin.

rniw, or Geenen, iowa, A conronarron or IOWA.

right columns rigidly secured on and car- V ried bythe frame l and between which, as

shown, the conveyor belt 9 is arranged t0 work. Y

The numeral 12 indicates a vertically adjustable boom, which, at its front end, is piv- .oted on a transverse shaft 13 journaled in rsuitable bearings on a trussed rearwardly projected boom-supporting frame 141 that is rigidly secured on the main frame 4. The shaft 13 carriesa large sprocket or chain of the wheell and a small polygonal wheel 16. A similar polygonal wheel 17 is journaled to the free rear end o-f the boom 12. A sprocket or link chain 18 runs over the two polygonal wheels 16 and 17. Said wheels 16 and 17, asl shown,y are hexagonal.

For raising and ylowering the boom 12, a cable 19 is attached thereto and extended over a guide sheave 20 onthe frame 14 and is attached to a suitable windlass indicated as an entiretyby the numeral 21. For rotating the sprocket or chain wheel 15, a chain or belt 22 is run thereover and this chain or belt Vis driven from the engine through-any suitable transmission mechanism indicated as an entirety by the numeral 23 and not necessary for the purposes of this case to further consider. The sprocket chain or link belt 18 carries a plurality of curved spades 2a formed byrflat sheet metal bent into segmentalform- VThese spades are rigidly secured tothe flanged outer ends of arms 25.

Said arms 25, at their inner ends, are bifurcated or forked and their prongs are formed integrally with or otherwise rigidly secured to laterally spaced link-forming elements 26, which latter are incorporated as certain of the links of the chain or belt 18. The linkforming elements 26 are adapted to be readily coupled to the standard links of the chain by coupling pins 27 that are held in place by cotters 28 passed through perforations in the ends of said chains and held between guard ribs 29 on the outer surfaces of saidlink- Q meines forming elements 26. rlhe pins 2"?, at one end, (see particularly F ig. 2), have flattened heads 2Ta that are held between the adjacent ribs 29. These ribs 29 also kperform the additional rfunction of preventing rota tion or oscillation of the pins in respect to the link elements 26, and, hence, cause the wear to take place between the pins and the standard links oi the chain andthus save the link elements 26 from wear.` rllhis is important because said elements 26 are a part of the cast arm 25, thereplacement of which would be expensive.

il sharp edged tempered cutting blade is bolted, riveted or otherwise rigidly secured to the iront edge olf each Spade and to the ilanged outer end of the spade-supporting arm. This cutting blade 30, at its ends, projects slightly beyond the sides of the `s ade and the shari 'trent edGe is cut on the line of la circle so thatthe central portion thereof will move in advance o the end portions in the excavating action. -This is important because, in the lirst place, it

will cause roots andthe like to work oli' at l the ends ol the cutting blade and, in the second place, will cut a ditch with a slightly rounded bottoni or that is lower at its central portionlthan at its sides. t is now important lto note that each blade-supporting arm projects outward from the rear ends ol the link-'forming elements 26 and that the spaderprojects rearward from said rarmv 25, directions-beingtaken in respect to the direction of travel of the chain 18,"in the excavating action. Thisfforward projection of the link-forming elements 26, from the spade-carrying arm 25, alioids means lvfor attaching-said link elements into the chain at a point in advance ofithe cutting edge `of the blade 3() and gives a good leverage resistance in'the chain to the reaction from the cutting force.

Another important result is this: J ust be- -ore a particular"spade reaches a posit-ion or dumping its l ad, (see Fig. one of the salient or projecting angles ot the wheel 16 strikes the rear portions oll the link elements 2G, there-by producing a -sort ot a rapping action and outward movement of the arm 25 and spade 2l., which serves to loosen the :dirt or load from the spade so that it will more readily subsequently disch-arge the load; and moreover, under continued upward movement, the spade and especially its rear portion will be thrown radially outward or farther away from't-he-vaxis ol Vthe shaft 13 so that the discharge o'l' the load from movements the spade `will be made an easier -matter and the spade will more readily throw its load :liornvard onto the transverse conveyor belt 9.

rhe excavating blades 2G are herein designated as cspades because they have much the laction of a spade, in that they cut the dirt loose and then scrape as well as carry Vthe load to the point of discharge. As the ments incorporated as links'in said belt, and

excavating spades or blades rigidly secured to the outer ends or' said arms. y

2. ln an excavator, the combination with a link belt of the sprocket'chain type, of polygon-al driving and guiding wheels over which said belt runs, outstanding arms -having bilurcated inner ends 'formed with integral laterally spaced link-forming elements ii'icorporated as lin-ks in said belt, and excavating spades or bla tothe/ou er ends of said arms, said spades being curved on lines that are approximately concentric vvto vthe axis of said wheels, in the movements of -said Y'blades laround said wheels. v

3. lnan excavator', thevco'mbinaticn with a .link belt 'ot the sprocket chain type, of polygonal driving and guiding wheels over which saidbelt runs, outstanding arms hav ing biturcated inner ends termed within tegral laterally 'spaced link-forming elements incorporated as links in said belt, and

excavating saades oriblades rieidl f secured to the outer endsbtsaitl arms, said spades being curved on lines'that are 'approximately concentric'to the axis oi'said wheels, inthe ol `said blades around said wheels, and the iront cutting edges osaid `Spades being yconvexly curved and wider than the-body port-ions thereof.

In testimony whereof I aiiix my signatureH GEORGE n. Giesemann.

des rigidly secured ico

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