US1917431A - Excavating tooth base with laterally interlocked points - Google Patents

Description

July 11, 1933. J. O'F. CLARK 1,917,431

BXGAVATING TOOTH BASE WITH LATERALLY INTERLOCKED POINTS Filed Deb. 22, 1928 2 Sheets'-Sheet- 1 I inventor.

\ c i/uc 5%074 July 11, 1933. J. OF. CLARK 1,917,431

EXCAVATING TOOTH BASE WITH LATERALLY INTERLOCKED POINTS Fi-l d Dec. 22, 1928 2 Sheets-Sheet 2 Patented July 11, 1933 I UNITED JOHN OFALLON CLARK, or six Louis, meson; AssIeNoR,BY,M'nsnn AssIGNMnnTs,

T AMERICAN MANGANESE weat comma-r, A denounce 0F MAINE ExcAvA'riNG ro-0TH BAs'n wrr'fi LA'rn'nALLi INTERnoox'En POINT e pl'icationifiied manner a, 1m. steam 32%,773.

This invention relates in part to a novel meansfor securing agalns't lateral spreading the members of a tapered nose on an excavating tooth point, when said nose has been sub.r

; divided longitudinally to admit the web means employed for tying together, against vertical spreading, divergentjav'vs of the replaceable point intowhich the nose is fitted in mounting the point upon the base;

The invention relates also in part to novel multiple web means through which to tie together the divergent jaws of such a point, as well as to a novel forna, of slotted nose adapted toreceive such point. This slot orthese slots in the bifurcated or multiple slotted nose as the case may be, being prefer:

ably so merged with recess panels in the sides of the base that the interior of the more massive part of the base will be opened up to heat treatment and quenching to a. degreethat is very beneficial to the finished piece.

Finally, the invention relates in part to a novel construction of keying means, the principle and general construction ofwhicl'r may be embodied in either of two designs appropriate, respectively, for interlocking the single web means and the multiple web means with the base in securing the point in position. Heretoforefit has been the practice to provide the diverging jaws of the point that received the wedged-shaped nose of the base, with either flanges, or projections, extending vertically upwardly and downwardly from their lateral marginal faces, into correspondingly formed recesses in the lateral faces of the nose or else cut away the for ward ends'of the nose members in vertical longitudinal planes in an manner to adapt said ends'to enter behind webs lying across the crotch of the point, somewhat after" the manner of an ordinary'rabbeted j oint,'so that stresses encounteredin use which are lateral to the replaceable 'p'oi'nt of't'he tooth and which are frequently of a very large ofrder,

are prevented, by the resultant lateral inter; engagement, from spr'ead'ing" apart the was into whichthe nose is sub-divided, But these methods of laterally interlock ng, as

well as certain adopted variations of them,-

coming within their principles,'while meas l urably effective for the purposesintended,; are not as efficient as they should be, and they. involve certain disadvantages from the standpoint of production ofjthe article. More over, the use of an'ordin'ary rabb'eted joint for lateral confinement in whichcrotch webs enter lateral recesses in the nose members are objectionable'because they reduce the seating area of the tapered nose, and the crotch webs obstruct access to the forward tapered ends of the seats for finishing; besides, the presence, of these websadds appre ciably to the mass'of the metal that, has tobe treated, in case the tooth is made of the most desirable material for the purpose, namely, manganese steel.- Accordingly, one" feature 'o thepresent'inventim embodies the'principle of laterally interlocking the point with the extreme forward ends ofthe nosemembers, by'providing the forward end of the tapered nose beyond'its'seating ends,-.at each of its outer walls, with a forwardlypresented interlocking projection inset from the outer lateral face of the nose; and provid 5 ing upon the point, forward of the conver- 1 gence of the jaws of the point, and set'inwardly from the'later'al faces-of the point, and between but forward of said seats, re cesses that receive said projections and afiord them such lateral bearing as will causeside- Wise stresses upon the point to" be imposed upon the walls of the nose in a-direction to them apart, andthe security thereby afforded I aga-inst spreading, being-the more. effective because the interlock is at the extreme forward end of. the nose, and therefore, at the farthest" point removed from the points at which the walls seek to bend under lateral stresses. v I A 1 j The I result of this relation between the parts is that the liigswhich extend forwardly from the apex ofthe nose are of greater vertical dimension than the nose immediate- 1y' adjacent the said apex, and the merger of thelugs with the nose is in; rear of the apex so that the, lugs have laterally presentedinterlocking faces-which extend from points '100 in rear of the apex to the ends of the lugs which are forwardly beyond the apex; and

.the recess which receives said lugs, being made to substantially conform to them, develops a sufi'icieiit range of lateral interlock combined with a seating of thepoint upon the nose through means of faces which diverge from two laterally spaced-crotches that conform to the apex.

Thenose of thebase which enters between the jaws of the point may haveone slot in a single medial vert cal plane bifurcating. the

. nose leaving the two members with forwardenters from one side, and threaded in the ly seating ends and laterally interlocking extensions beyond the seating portions of said ends; or there may be two slots in parallelvertical longitudinal planes jdividingthe nose into-an intermediate forwardly-seating wall and two outer forwardly seating walls;

the point being provided in the former in:

stance with a single 'webwhich enters the single slot in the nose; and in the'lattei' instance with two spaced webs entering the two slots in the nose.

with a channel or channels that receive anchoring shanks integral with the web or webs,-

and these sockets extend iea-rwardly until they .merge with side panel recesses, so that the interior mass of the base is thoroughly opened up to heat treatment, to the material advantage of the finished piece, In carrying out that part of the invention which relates to-the improved form of keying means, the invention provides a key bolt with wedging sleeve means, which, whileserving the purpose long recognized as desirable, ofldrawing the. point firmly upon the tapered nose, willdo; so without requiring an exposed nut on the' inserted-end of the bolt, and without rotating the wedging memberin the'partsof 1 the wall and web (or webs) in which it bears; the bolt being threaded into the wedging 4ta sleeve. member and constituting drawing means which causes-the wedging means to seat forwardly against the base, and rearwardlyagainst the overlapping web,' there-' by anchoring the point to the base. Thisv wedging meansinay be"either single, and

comprise 'il wedge-shaped sleeve entering from one side and threaded tothe bolt which enters from and finds seating at the other side, so that the sleeve is drawn into bearing against all the walls of the'overlapping parts, or itmay be dual and comprise two wedge-shaped sleeves entering rom opposite sides, each bearing against portions of the overlapping membersfthe bolt, iii this in stance, being headed against the sleeve that locked against unscrewing from the. sleeve in T he slot or slots formed in the nose communicate rearwardly' which it is threaded, for instance, by spreading the inserted end of the bolt in a flaring cavity found in the outer end of the sleeve. The dual sleeve embodiment of the invention is especially advantageous when used in connection with the plural web form of point assembly, since there are, in this embodiment, two webs with symmetrically beveled apertures assuming identical relationto the respective wedging sleeves, and therefore, the point is. reversible in position, to prolong its life. In the single wedge. embodiment, in order that' the point may be reversed, the wedgingsleeve lies with its axis at such an angle to the transverse plane of the tooth, as will. bring the rear side of the wedge, .and

therear wall of the 'web aperture, normal to the longitudinal axis of the tooth (or in coacts with the wedge in either; position i of the point. 7w In the accompanying drawings, in which two embodiments ofeach feature of the invention are shownby wayof illustration Figure 1 is asideelevation of the single web and single wedge form of the invention.

Figure 2 is a horizontal section, on an enlarged scale, of those portions of the point and base shown in Figure 1, which are immediatelyconcerned with the features of the present invention.-

Figures 3 and 4 are views corresponding, respectively, to Figures 1 and 2, but embodying thatform of the invention in which two webs are providedbetween the jaws of the point, and two wedging sleeves to secure Figure 5 is an endviewthat is typical of all the Wedging sleeves.

Figure 6 is a side elevation of that one of I upper and low 1' divergent jaws 3 which arepreferably of identical construction, in order that the tooth, for the sake of prolonging its service, may be applied with either. of its inclined faces downward. Base 1 is provided.

with a wedge-shaped nose 4 that fits between the jaws 3. In order to resist spreading .of the jaws 3 under ,verticalstresses encountered by the tooth innse, saidjaws are integra'lly unitedjby a 'web15. This web extends rearwardly to provide a'n'fanchoring shank6. In o'rderto receive the web 5 and shank 6,

; nose 4 isprovided with a vertical longitudi Slotting the nose 4 subdividesit into walls 4a, with the result that lateral stresses, encountered by'the point 2 in service, load that wall of the nose toward'which thestress is exerted, to a degree which tendsvto spread the walls apart and seriously attackthe integrity of the base. The present invention meets the last-named condition by forming on the forward end of each wall 40b beyond of a lug Swill encounter the opposing wall ofits recess 9 before a wall 4a can be stressed beyond its elastic limit under loads encoun-' tered laterally by the point.

'Inasmuch as the bending points of wall ia are at the inner end'of slot 7, and locking lugs 8 are at the extreme distance therefrom,

the interlock with the point effected through said-lugs, is the most eflicient that can beobtained. V

In the assembly of the point of the tooth A with its base, longitudinal seating of the nose members 4a in the crotch of the point occurs'hetween those portions of said nosemembers which he 111 planes outslde of the lateral interlock portions 8; and to render .o more efiective'the seating of the parts against vertical transverse play, then converging faces, and the confronting faces of the crotch that receive them, continue to substantially an, apex as shown by full lines in Fig, 1 instead of being abruptly terminated in extended tianswirse faces as heretofore'.'

Again, those portions of thesaidfnosemembers which provide'the lateral interlock between the base and the point overlap longitudinally upon, and thus, in addition to any extension which they may have for-;

wardly beyond said apexes, theyextend rearwardly of the said apexes where-they are better sustained; and they are of greater vertical transverse dimension than the saidlongitudinally seating portions as shown by dotted lines in Fig. 1, so that the recess 9 that receives them is undercut above and below the said apex and an altogether novel substantial structure results.

Recess 9, as shown in Figure 2, extends clear from side wall to side wall of the crotch of the point, thereby materially reducing the heaviest section of the'point, which is beneficial in heat-treating the manganese or other steel casting, and facilitates finishing. Lugs 8 are so located that they are free of any interference, and easily ground and cleaned in finishing the piece; and the enlarged re c ess 9 and design of lugs 8, together facilitate 55 assembly.

In'order to anchor the point onthevbase, the shank 6, according to another feature of the present invention, while receiving rearward pressure from a wedging member that is sustained against forward displacement by the walls 4a as has heretofore been the prac-,

tice, has such wedging force developed, not through wedging-faces of a bolt drawn by a nut, but through wedging faces of a sleeve 10 which is-tapered (at least in one diametric plane) so that it can enter into wedging bearing asfstated, and this wedging element is drawn in the direction of its axis and there fore transversely to the anchoring shank 6,and to the walls 4a, by means of a bolt 11, thehead 12 of which seats againstthe base at 13, while its shank is threadedintothe sleeve 10. Sleeve 10, by reason of its n0ncircular section, for instance, as illustrated in Figure 5, is prevented from rotating with the bolt 11; and in order to' prevent the bolt 11 from backing out under vibration, the remote end of the sleeve 10 is recessed, 'a's shown at 14', and the extreme endof the bolt 1 is slotted, as shown at'15', so that theend of the bolt can be spread through means of aucold chisel or equivalent tool to prevent withdrawal mtil'such force is appliedto the bolt, inthe direction of'unscrewing, as will force the split ends together.

. Inorder that the point shown in Figures 1 and 2, may receive the wedging sleeve 10,

in either of two positions which it adapted to assume on the base, sleeve 10, in fitting the opening through the base, assumes an inclined position "that brings its rear wedging surface normal tothe longitudinal axis of the tooth, so that the rear wall 5X, of the opening in the shank 6, is straight and will, therefore, receive the wedging sleeve in full bearing whichever side of the tooth isdownward. i s r Referring to the form shown in Figures 3 and 4, base 1a is provided with two vertical longitudinal slots 70 and 77), dividing the nose into outeriwalls 4a, each of which car ries a forwardly'presented lug, 8a entering two anchoring shanks 6a. A bolt 11a has its head 12a seated a ainst a wed 'in sleeve 2-: Pa h 10a inserted from one side and bearing forwardly against one outer wall 4a and the intermediate'wall tband rearwardly against one of the anchoring shanks 6a; andthe inserted end of said bolt Ila-is threadedinto and securedby's'plitting its end 15 within the.

flaring bore ofanother wedging sleeve-10 a,

inserted from the other side of the base, and

i degree.

war-dly against the other anchoring shank 6a. WVith this construction, the point 2a is sustained by the middle wall at and one of.

: theyraremore easily cleanedand ground;

that is to say, the finishing tools are free from interference in cleaning and grinding their faces. Besides, the recessescan be made larger than the lugs, to reduce the faces that llilVQllO be fitted together. Moreover, in enlarging the coring of the point at the meeting of the converging jaws, as explained, a

better casting can be made for the reason that metal is being excluded from the heaviest portion of the mass, which is exceedingly difiicult to solidify in the pouring of the point member. Finally, the stay lugs and recesses arelocated where they can be very much better )rotected than can the oppositely projecting flanges, or variations thereof, heretofore used onthe margins of the diverging jaws. I

IVith a wedging anchoring device as herein described, one of the vulnerable and most seriously attackedelements heretofore employed, namely, the nut on the inserted end of the bolt, is completely done away with; the threaded connection is whollyinternal and free from attack; the wedging means, Whether used singly or in a pair,make a superior anchoring instrumentality as compared to'a bolt; and the tightening operation is very much more conveniently performed because the wedging sleeve locks itself against rotation.

In order to turn the 'slottingfeature of the base to advantage, in the sense of improving the quality of metal in the base, the slot 7 (Figures 1 and 2) and the two slots 7a (Figures 3 and 4) are continued rearwardly until they meet the paneling recesses 16 (Figures 1 and 2) or 16a (Figures 3 and 4c), recess 7, which is in the medial plane of the base, being brought into communication with the recesses 16 through means of the transverse cored opening 17. In this manner, the

areas of ma or mass of the base are opened.

up to the influence of the heating and quenching media of the heat treatment, without weakening the base structureto any material I claim:

1. A replaceable point excavator tooth,

comprising a base bifurcated to form two point-engaging furcations, said base having upon each of its members vertically presented point-seating faces converging forwardly to substantially an apex; and aipoint having Jaws diverging rearwardly from laterally spaced crotches and substantially conforming to said apexes and to said seating faces;

said base having at its apex, in vertical long1tud1nal planesspaced inwardly from its outer lateral faces, lugs for laterally interlocking it with the point; and said point ha'ving, intermediate of its laterally spaced crotches,-a recess providing faces which, re:

ceive the lateral faces ofsaid lugs; the vertical transverse dimensions of the lugs and the recess being sufli cient to provide laterally presented interlocking faces a material distancevin rear of theapex of the base as well.

as forward thereof. I

a new article of manufacture, an excavator tooth base constructedas described in claim 1, and adapted to receive and inter locklaterally as vwell asvertically with a point constructed as described in said claim.

3. As anew article of manufacture, an excavator tooth point constructed asdescribed in claim 1, and adapted to conform toand interlock laterally as well as vertically with a tooth base constructedfas described in'said elaimQ 4. A replaceable point excavator. tooth,

comprising abase bifurcated to form two point-engaging fur-cations, said basehavmg uponeachof its members vertically presented point-seating faces converging forwardly tov substantially an apex; and a point having jaws. diverging rearwardlyfrom laterally spaced crotches and substantially conforming to saidapexes and to said seating faces; said base having at its'apex, in vertieal'longitudinal' planes spaced inwardly from its outer lateral faces, lugs extending beyond the point-seating faces for laterally interlocking it with the point; and said pointhavingintermediate of its laterally spaced, crotches,fa

recess providing faces which receive the lateral faces of said lugs; the vertical transverse dimensions ofthe lugs and the recess being sutficient'to provide laterally presented interlocking faces a material distance in rear of the apex of the base as well as forward thereof; i i

5. In areplaceable point'tooth, a, point member having diverging jaws and web means connecting said jaws, and a base memher having a wedge-shaped nose adapted to fit between the jaws of the point member and slotted, to permit the point member to be placed in position upon the base;said point member having rearwardly presented recesses; said nose ha-ving upon its forward end, lugs adapted to enter said recesses, said web'means comprising two vertical longitudinalwebs; and said nose comprising two outer walls and an intermediate wall.

6. A tooth for excavating implements, com

prising a point member having two rear-' wardly extending anchoring shanks, a base slotted to r-eceivesaid shanks and having twoouterfwalls and an intermediate wall, wedging sleeves inserted from opposite sides of' the base, each of said sleeves bearing for? wardly against an outer wall of the base and rearwardly against one of the shanks-of the point member,and a bolt'seated in one Wedging sleeve and threaded into the other wedg ing sleeve.

7. A tooth for excavating implements,'con1-- risin a oint member havin two rear- C! O wardly extending anchoring shanks, a base slot-ted to receive said shanks and having two outer walls and an intermediate Wall, Wedging sleeves inserted from opposite sides of the base, each of said sleeves bearing forwardly against an outer wall of the base, and rearwardly against one of the shanks of the point member, and a bolt seated in one Wedging sleeve and threaded into the other wedging sleeve, the sleeve into which the bolt is threaded being of non-circular section, and

thereby held against rotation.

8. In a replaceable point tooth for excavating implements, a base member, a point member reversibly fitted to said base member, said base and point members having portions through which they overlap each other, a'

wedging sleeve inserted in one direction of Dec. 1928.

holding said members in assembly compris ing a wedging sleeve inserted in one direction through overlapping portions of said members, a bolt inserted in the opposite direction through overlapping portions of said members, and a second Wedging sleeve inserted throughoverlapping portions of said members in said opposite direction; said bolt being seated in said second sleeve and threaded into the sleeve first named.

Signed at St. Louis, Missouri, this 14th day Joini OFALLONCLARK.

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