US1918841A - Dipper tooth - Google Patents

Description

F. FINKL DIPPER TOOTH July 18, 1933.

Filed-Nov. 4, 1932 2 Sheets-Sheet l .W/ .7 4 M 4 l July 18, 1933. FlNKL 1,918,841

DIPPER TOOTH Filed Nov. 4, 1932 2 Sheets-Sheet 2 Patented July 18, 1933 FRED manner onioaeo, innnvors, assreivoa To a. rin a sons nomi es CHICAGO, r nnvois, A oonronarron orrrnrnors;

mrrna moor Application area November 4, 19 32. Serial No. 641,156.

Bis heretofore manufactured, dipper teeth a of the detachable type have consisted of a base and a renewable tip or tooth suitably supported on and connected to the base The tip is, of course, subject to severe abras on, so is arranged to be renewed after its useful- 1 ness has been substantiallyimpaired. It has been demonstrated, however,that in addition to the abrasion of the tip,=the adjacent por tions ofthe base are also more or less subject to wear and distortion.whiohmay, afterlong use, be sufficient to'impair the usefulness of the base, and particularly where such Wear or distortion may alfectvthe supporting surfaces of the tip-receiving socket at the front end of the base. I V r In orderto illustrate my invention, I have shown herein a base and dipper tooth of the generaltype disclosed in my prior, ap

ion filed May 20, 1932, and bearing erial No. 612,422, now Pate11t No. 1,890,981.

hen employed with thegeneral typeof removable tip therein illustrated it will be understood that the'bearing portions of the base immediately adjacent the removable tip are protected from excessive wear andabrasubject to such excessive wear as the tip itself,

may be replaced from time to time asneeded' sionby a separate plate which, although not Figure 4 is a fragmentary side viewof a dipper tooth and base assembly'showing a modified form of my invention; vi Figure 5 is a detail section taken on broken line 5-5 of Figure-4. v L

Figure 6 is aperspective view showing the under face of one of the wearing plates shown in Figure 4,;but removed from the'base.

Referring now to the details of the-em;

bodiment of my invention shown in the draw-' ings, 10 indicates the projecting portion'o-f a tooth base which-is secured to the dipper (not shown). in the usual manner. 'The detachablctiportooth is indicated generally at 11 and comprises a head 12 and a shank 13. The head 12 .is formed with two plane u r and lower facesllyl l converging f dl to the point ofthe tooth, and't-wo sid faces 15,15;

The;

en ree STATES PATENT l I head 12 also has two rearwardly convergingplane fa'cles16, .16 which meet the" rearward edges of the forwardly converging faces 14: at anobtuse angle, andmerge into the shank 13 at the center and along the rounded edges 17, 17 extending laterally from oppositesides of the shank. v

' A. -pair of nterlocking ribs :18, 18 are formed as elevations along the top; and bottom of. theishank 13 and merging into each I rear .face'16, said ribs extending longitudi 4 nally and centrally of the major axis of the tOOtl'l. I v v I V- v The shank 13 is si ibstantially wider in, a direction extending transversely of thetooth than in a vertical direction, as seen in. Figure 3. A-suitable aperture 19 extendsthrough' the rearend ofthe shank for engagement by r a Wedge pin 20, asindicated in Figure 1 The base 10 1s prov dedwith corresr'aondinginter} locking surfaces for receiving the tooth, :in; cluding socket 13 to receive theshank13, and inwardly converging walls T16, 16 to receive the rear walls'16', 16in seatedenga'gemBIlt. V

7 Referring now more particularly-Ito the subject matter ofqthe present invention, it,

willbe observed that Iprovideyaremovable plate 25 in rabbeted or countersunk{position along-the, outer: surface 1 26 of the toothzbase .10, said plate havinggitsl forward te'rminal lGU Y edge 27 arranged flush with the adjacent end surface 16 forming a part-of the tip-supporting surface of the base. In the form shown, two of such plates 25, are employed, one at the top and the other at'the bottom of the tooth. It will be understood that in some instances it may only be necessary ,touse one such plate, applied to the upper face of the tooth, since this upper face is usually arranged at aisubstantially inclined angle to' the mater1al being loaded mto the dipper,

and therefore is sub ect to much greater wear l0. Suitable means are provided for detachably securing the plate to the base, in the. form shown in Figures 1, 2 andB of the drawings, said means comprising a depressed boss 29 struck from the plate adjacent its rearend'to receive a cap screw 30 passing through said boss and engaged in a screw threaded aperture 31 in said base. A suitable socket 29 is, of course, formed in the rabbeted' surface 26 of-the base to receive the shown'in Figure l. The forwardedge of the plate 25issecured by anoverhanging lug 32 which herein is formed centrally of theplate and depending from the front margin thereof 'in'ialignment-with the inclined front face 27. Saidlu-g fits in asuitable recess 32*formed.

in the inclined front face 16 of the base so as tobe flush with the latter, as clearlyshown in-Figure 1. In theform shown, the lug 32 is cut away at its central "portion 18 tof'fit over'the 'rib lS forming part of the shank 13.-

The arrangement is such that when the '25-is to be secured in pla'ce,-the' lug 32' is hooked into the'socket 32, ing the frontedge of'the plate centrally of the base. Therear end of the plate may then beisecured in place by thecap' screw 30 as Y shownin Figure 1.

'With'the parts in assembled position as shown, it will be observedthatthe front'edge 27 of the plate and the -associated front surface of lug 32 are seated flush with the adjac ent inclined front surfaces 16 forming part of the socket in which the head 12 is seated. flVith this construction, the plate 25 forms a substantial supplemental portion of the tooth socket alongits outer margin.

With-the construction just described, the plate 25 may be removed whenever it has become worn excessively along its outer surface. In ordinary usage it will be understood thatthe tip l1 may be replacedmany times before it is necessary torenewthe plate 25; Furthermore, therepeated' shocks and is secured to the base by boss 29 as clearlythus positioncuring said wearing distorted by the continued spreading action of the tip as just described, yet the socket can be quickly restored to its proper tipsupporting shape by the insertion of a new plate 25, whenever necessary.

Inv the form of renewable plate shown in Figures and 6, both inclusive, the plate 40 a pair of'marginal flanges 41, 41 having-dovetailed engagement in undercut grooves 42, 42 along'the upper side edges of the rabbeted or recessed portion $3 on whichsaid plate isfitted, as-is best indicated in Figure 5. plate may moved, by its fullyseatedposition with the rear end 46 abutting the shoulder atthe end of the rabbeted surface of the tooth. I11 thisposition the front edge 47is-supportedflush with the adj acentsocket-forming walls of the base in the same manner as -described inconnection This form of be attached whenthe tip is rewith theform of-plate shown in Figures'l'to 3, both-inclusive.

. Although I have illustrated and described certain embodiments ofmy invention, it will be understood thatI do notwish-to belimited to the exact constructions shown and describe herein, butthat various changes and modifications may be made withoutdeparting from the spirit and scope 'of my invention as defined in the appended claims' I;claim: V

l. A dipper tooth including a baseand a detachable tooth, said tooth consisting ofka headand a rearwardly projecting shank, said base having a socket including a surface for receiving said shank in close fitting engagement, and a wearing plate fitting on the outer face of said base contiguous" to said head, and with the forward edge of said wearing plate flush with and supplemental to said socket-formingsurface of said base, and means for securing said wearing plate to said base.

2. A dipper tooth including a base and a detachable. tooth, said tooth consisting of a head and a rearwardly projecting shank, said base having a socket including a forwardly and outwardly inclined surface for receiving said shank in close wearing plate fitting on the outer face of the forward'edge of said wearingplate flush with and supplemental to said socket-forming surface ofsaid base, and means. for seplate to said base. i

3. A dipper tooth including a base anda sliding said plate lengthwise to fitting engagement, and a v detachable tooth, said tooth consisting of a head and a rearwardly projecting shank, said base having a socket includingla forwardly and outwardly inclined surface for receiving said shank in close fitting engagement, and a wearing platefitting on the outer face of said base contiguous to said head;

and with the forward edge of said wearing plate fiush with and supplemental to said socket-forming surface of said base, and

means for securing said wearing plate to said base, including a lug pro ecting 1n- -wardly in interlocking engagement with the adjacent part of said base.

A dipper head and a rearwardly projectingshank,

said base having a socket including a for-- wardly and outwardly inclined surface for receiving said shank in close fitting engagetooth including: a base and a detachable tooth, said tooth consisting of a merit, and a wearing plate fitting on the outer face of said base contiguous said plate flush with and supplemental to d socket-forming surface of said base,

means for securing said wearing plate to said, base, including a lug projecting in- V to said .head,1' and 'with the forward edge of said w'earing wardly in alignment with said forward edge of said plate and in interlocking engagement with the adjacent part of said base.

5. A dipper tooth includingja base and a detachable tooth, said tooth consisting of a head and a rearwardly projecting shank, and a wearingplate detachably secured to said base contiguous to, and. insubstantial alignment :with, said tooth, and securing means for said plate including an integral overhanging portion having interlocking engagement with said base. w r

FRED FINKL. I a o

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