US1697536A - mi ley - Google Patents

Description

W. E. MILEY DIPPER TOOTH Jan. 1, 1929.

Filed April 192s 5 Sheets-Sheet 1 ATTo'R/vzx i iii". l

6 will? Jan. 1, 1929. 1,697,536

E. ILEY PPPPPPPPP TH M mum i ll INVENTOR.

ATTORNEY 'Jan. 1, 1929; 1,697,536

W. E. MILEY DIPPER TOOTH Jan. 1, 1929.

W. E. MILEY DIPPER TOOTH Filed April 22, 1925 5 Sheets-Sheet 4 M/VE/VTOFR W E. M/LEY A TTOR/VEY Jan. 1, 1929.

1,697,536 W. E. MILEY DIPPER TOOTH Filed April 1925 5 Sheets-Sheet 5 I i l I Q} ATTORAAEY.

Q Fig. 2 4E.

Patented Jan. 1, 1929.

UNITED STATES PATENT OFFICE.

WALTER n. MILEY, or MARION, oriro, A ssmnon 'ro MARION STEAM SHOVEL com- PANY, or MARION, OHIO, A ooRPoRA'rIoN OF OHIO.

DIPPER TOOTH.

Application filed April 22, 1925. Serial No. 24,957. i

secured to the base. In such two-part dipper I teeth the points have for the most part been.

connected with the base by means of a bolt and this bolt is subjected to the heavy strains imposed upon the point of thetooth during the digging operation with the result that it is broken so frequently as to be seriously objectionable. Further, the bolts are usually so arranged that they either do not serve to draw the point into snug engagement with the base or if they'will so operate they are of a special construction and can be secured only from the manufacturers of the teeth. It is very ditficult for the manufacturer of teeth of this kind to make the points and bases interchangeable and to provide such accurate workmanshipthat a given point will fit snugly on any base. Consequently when no means are provided for drawing the point into snug engagement with the base the fit is likely to be a loose one which is unsatisfactory and subjects the bolt to additional strains. Where the bolt is specially shaped to draw the point into engagement with the base it is usually of a tapered character and if the point does not fit fairly closely onto the base it is diflicult to insert the bolt and draw the same down to its final position. Further, it is necessary to protect the nut on'such a bolt by overhanging lugs and this makes it very difficult to apply or remove the nut; and if such a special bolt is lost or broken it is necessary to secure another one from the manufacturer as a standard bolt cannot be used.

One object of the present invention is to provide a dipper tooth of this character in which the base and point will be provided with interlocking parts which will of themselves retain the point on the base and which will be so arranged that they will receive the strains due to the digging thrust on the dipper.

A further object of the invention is to provide in connection with such a dipper tooth a connecting device for drawing the point into snug engagement with the base and which will be so arranged that it will not be subjected to any strains in the normal digging operatlon.

A further object of the invention is to provide such a dipper tooth in which the inter.- locking parts of the point and the base can be brought into interlocking relation only when the point is in an abnormal position with relation to the base and in which the point will be retained on the base independently of the connecting device when it is in its operative position; and, further, in which the interlocking devices will be so arranged that if the connecting device is lost the point will not become separated'from the base and lost.

A further object of the invention is to provide such a dipper tooth which will be simple in character and which will boot a very strong durable construction.

' Other objects of the invention will appear as the device is described in detail.

In the accompanying drawings Fig. 1 is a top plan view of a dipper tooth embodying my invention; Fig. 2 is a bottom plan view of the same; Fig. 3 is a longitudinal sectional view taken on the line 33 of Fig. 1; Fig. 4 is a side elevation of such a dipper tooth; Fig. 5 is a perspective detail view of the base; Fig. 6 is a perspective detail view of the point Fig. 7 is a plan view of a modified form of point; Fig. 8 is a side elevation of said modified point; Fig. 9 is a rear elevation of said modified point; Fig. 10 is a transverse sectional view taken through the interlocking parts of the point and the base; Fig. 11 is a plan view of a modified form'of the base; Fig. 12 is a front elevation of said modified base; Fig. 13 is a side elevation of said modified base; Fig. 14 is a top plan view of a further modification of the tooth; Fig. 15 is a bottom plan view of the tooth of Fig. 14;

Fig. 16 is a plan view of the rear portion of the point of the tooth of Fig. 14; Fig. 17 is a side elevation of said point; Fig. 18 is a plan view of the base of the tooth of Fig. 14:, partly broken away; Fig. 19 is a side elevation of said base, partly broken away; Fig. 20 is a side elevation'of the tooth of Fig. 14; Fig. 21 is a. longitudinal sectional view taken on the line 21-21 of Fig. 14; Fig. 22 is a longitudinal sectional View taken on the line 22,-22

excavating devices of various kinds; and the term dipper as used herein is intended to include any excavating device with which such a tooth may be used.

In that embodiment of the invention shown in Figs. 1 to 6 the tooth comprises a base 1, the rear portion of which is bifurcated horizontally to receive the forward edge of the dipper front, as shown at 2' the base being se- CgI'Od to this dipper front, by means of rivets or bolts extending through the upper and lowor portions of the base and through the dipper front as shown at 3. The upper and lower portions of the base may be of any desired length and frequently extend for a considerable distance along the dipper front but the length of these parts of the base has no bearing upon the present invention and they have therefore been broken away in the present drawings. The base is provided with a forwardly extending portion, which extends beyond the edge of the dipper front 2 and which is provided with a transverse socket, adapted to receive a part carried by the point of the tooth. In the particular construction shown in these figures this forward portion of the base comprises a central longitudinal projection or rib 4 the lower portion of which is spaced above the bottom of the base and is preferably curved forwardly and upwardly, as shown at 5. The upper edge of this projection or rib is inclined downwardly and forwardly and is provided with a transverse opening or socket 6 which is circular in form but has itsnpper portion opening through the upper edge of the rib, the socket comprising slightly more than a semi-circle. In this particular form of the device the socket is divided by a longitudinal partition 7 into two parts which in effect constitute separate sockets but this is an optional feature of the construction. and its .use will depend upon the character ofthc'point employed. Extending alongside of the central rib or projection 4 and formed integral therewith are two elongated lugs 8 which are of a length somewhat less than the length of the rib and are of less vertical width than the rib, the

lower portions of these lugs being approximately flush wit the adjacent portion of the rib and their u er edges being. spaced some distance below the upper edges of the rib and provided with curved recesses 9. As has been stated, the lower surface of the forwardly extending portion of the base. is spaced above the bottom of the base so as to provide a transverse shoulder 10 which is provided with recesses or sockets 11 arranged near the respective sides of the base. At a point between these sockets and preferably central of the base, this lower portion of the base is provided with a longitudinally extending hole 12 which opens into a recess 13 in the lower part of the base and is adapted to receive a connecting device .which will be hereinafter described.

The point of the tooth may take various shapes but the point shown in these figures is reversible so that it may be mounted on the base with either face upward and is therefore shown as of a tapered or wedge shape and as having flat upper and lower surfaces. The rear portion of this point is bifurcated both horizontally and vertically so as to divide the same into two pairs of arms 14 and 15. The upper and lower pairs of arms are spaced apart a distance suflic-ient to receive between them the laterally arranged lugs 8 0f the base and the arms of each pair are spaced apart a distance suflicient to receive between them the rib or forwardly extending projection 4 of the base. The arms of each pair are provided with inwardly extending lugs 16 adapted to enter the sockets 6 in the rib 4. In the present form of the device, in which the socket in the ribis divided into two parts, separate lugs have been provided and these are spaced apart a distance sufficient to receive between them the partition 7 which divides the socket into two parts. These lugs are curved to conform to the shape of the sockets and have their outer portions flattened so that they will lie substantially flush with the upper edge of the rib 4 when the point is in itsnormal position. By thus flattening the lugs on one edge the diameter of each lug is shortened so that the lugs can be inserted in the sockets when their narrow portions are brought into line with the open edge of the socket, which can be done only when the point is in an abnormal position with relation to the base. In the present arrangement in order to insert the lugs in the socket the forward end of the point must be elevated until it extends at substantially right angles to the upper edge of the rib 4. When the lugs have been inserted in the respective sockets and the point moved downwardly to its normal position in line with the base, the lugs will be moved to such a position with relation to the sockets that they cannot be Withdrawn therefrom and consequently the point can be removed from the base only by again moving it into said abnormal position. \Vhen the point is moved into line with the base the lower pair of arms, 15, are moved into positions heneath and in contact with the elongated projections 8 at the respective sides of the rib 4 and their rear ends will enter the respective point as to retain it in proper operative rela-' tion to the base even though no other connecting device is provided. I prefer, however, to provide a connecting device which will retain the point in its proper operative relation to the base and which will serve to draw the point snugly against the base. The pres-- ent construction is such that a standard bolt may be utilized as this connecting device and to this end the bearing lugs 16 are provided in their adjacent faces with recesses 17 adapted to receive the head of a-bolt 18 which, when its head is seated in said recesses,- will ext'end between the lugs and through the opening 12 in the lower portion of the base, the threaded end of the bolt extending into the recess 13 and having the usual nut applied thereto in said recess. Obviously by tightening down this nut the. point willbe drawn rearwardly into firm contact'with the base and inasmuch as the usual digging strains on the point are downward and rearward these strains will be transmitted to the interlocking parts of the base and the point and little, if any, of this strain will be upon the bolt or'connecting device. The only situation in which the bolt 18 will be subjected to any material strain would be for the operator to permit the dipper to drop so that the lower side of the point would strike the ground with force, thus tending to move the point of the tooth upwardly with relation to the base and the strains thus imposed upon the bolt would be lengthwise thereof and there would be little tendency to break the bolt. Should the bolt be lost it can be replaced by any standard bolt of the proper .-size, and the loss of the bolt would not necessarily interrupt the digging operation because, as above explained, the thrust on the POlIlb ;()f the tooth in the normal digging opera'tzibn is such as to retain the interlocking parts of the tooth and the base in their proper relative positions. Should the tooth strike upon the ground in the downward movement of the dipper, while the bolt 18 is missing, the point would swing upwardly about the axis of the bearing lugs 16 and lie back upon the base but it would not be disconnected from the base and therefore would not be lost. The upper and lower pairs of arms 14 and 15 being identical and be ng provided with identical bearing lugs it will be obvious that the lugs of either pair of arms may be inserted in the sockets 6, thus rendering thepoint of the tooth reversible.

In Figs. 7 to 13, I have illustratda slight modification of the tooth and have shown in connection with this modification a special type of point which is not reversible and which maybe characterized as a duck bill point. As shown in Figs. 7, 8 and 9, this point comprises a fiat forward portion, as shown at 19, which carries the cutting edge of the point and which is reinforced by an inclined rib 20 extending upwardly-therefrom and lengthwise thereof. The rear portion of the point is bifurcated horizontally and laterally to provide the two pairs of arms, as above described, these arms being here shown at 21 and 22. Between the arms of the upper pair is arranged a bearing member or lug 2-3 which is generally round in construction and has its outer portion flattened so that it will lie substantially flush with theouter portions of the lower pair are connected one to the other the base is provided with a forwardly extending projection or rib 28 having therein a transverse socket 29 which in this instance extends for the full Width of the rib, this socketbcing substantially circular in shape but opening through the upper edge of the rib,

this opening being of a width somewhat less than the diameter of the socket. Integral lugs 30 extend lengthwise of the rib on opposite sides thereof in. the manner above described and the lower surface of this forwardly extending portion are spaced above the bottom of the base. The socket 29 is provided with a circumferential groove 31 arranged centrally thereof and adapted to receive, and form a guideway for, the stud 24 carried by the bearing lug on the point. The point may be connected with the dipper only by moving the point to an abnormal position in which the shortened diameter of the bearing lug 23 will be in line with the opening of the socket- 29. lVhen the bearing lug is inv rted in the socket'the stud 24 will enter the guideway or groove 31 and position the lug with relation to the socket and when the point has been moved into line with the base the lugs will be held against removal from the socket. The retaining device or bolt is extended through the opening 26 in the lug 25 of the lower pair of arms and through an opening 32 in the lower part of the base, in a manner similar to'that above described and when this from in its details of construction. As shown in these figures the base 34 is mounted on the dipper front 2 in the manner first described and the forwardly extending portion thereof is shaped for interlocking engagement with the corresponding parts of the point. In

this construction, however, the central for-.

wardly extending projection or rib shown at 35 is relatively thin and the lateral lugs or projections 36 are somewhat larger than those above described and constitute arms, the upper portions of which are spaced from the rib 35 and are provided with curved recesses or sockets 37, the walls of which preferably flare outwardly. The rib 35 is provided with laterally extending studs 38, projecting from the opposite sides thereof and arranged in line with the respective sockets 37. This forwardly extending portion of the base is spaced above the bottom of the base substantially as above described to provide a transverse shoulder 39, the central portion of which is in the form of a flange and the forward portion of which is provided with re-' cesses 40. The central portion of this shoulderor flange has a longitudinal opening or.

bolt hole 41 to receive the connecting bolt.

The point 42 of this type of tooth is of the wedge shape reversible type above described and is provided with two pairs of arms 43 and 44. These arms, however, are spaced comparatively short distances apart, there being just sufficient clearance between the arms to permit the rib of the base to enter the space between them. The several arms are spaced inwardly from the lateral surfaces of the point and are provided at their rear ends with outwardly extending lugs 45 shaped to fit within the sockets 37 and the arms or lateral projections 36 .of the base, the end portions of theprojections 36 being arranged to enter thespaces between the lugs 45 and the forward portion of the point on the respective sides of the arms 43 or 44. Each arm is provided in its rear end with a longitudinal recess 46 adapted to receive one of the studs 38 on the rib 35 of the'base. These recesses in the arms are so arranged that when the point is moved to a transverse position with relation to the base the recesses will be in line with the sockets 37 and with the studs 38, thus permitting the lugs 45 to enter the sockets and the recesses: 46 to embrace the studs 38. \Vhen the point is moved downwardly to its normal posit-ion in line with the base the recesses 46 will be out of line with the sockets and consequently cannot be witlr drawn from the studs 38. The downward movement of the point will cause the lower pair of arms to move beneath and into engagement with the lower sides of the arms 36 and the rear ends of these arms and the lugs 45 thereonwill enter the recesses 40 in the transverse shoulder on the base. In this form of the tooth means are provided where by any upward thrust on the forward end of the point will be transmitted directly to the base and the connecting device itself will not be subjected to any strain. I have provided the arms of each pair, near their forward ends, with inclined shoulders 47 which are so arranged that the shoulders of the lower pair ofarms will be spaced a short distance below the lower edge of the forwardly extending projection or rib of the base. The connecting device is in the form of a bolt which may, if desired, be provided with a wedge shaped head shown at 49, the lower face of which is adapted to engage the shoulders 47 of the lower arms and the upper face of which engages the lower edge of the rib 35. This bolt extends rearwardly between the arms and through the opening 41 in the base. l/Vhen the nut on the bolt is tightened down the tapered head will be drawn into wedging contact With the shoulders 47 and the rib 35. Consequently any upward thrust on the forward part of the point will be transmitted through 'the head of the bolt to the rib of the base. While this device is designed primarily for use with a bolt having a tapered head it will be obvious that a standard bolt may be used and the head drawn along the inclined shoulders until it is wedged between these shoulders and the rib 35. To facilitate the insertion of the long bolt which is here used, the arms are provided in their inner faces with slots 50 through which the head of the bolt may be moved. In applying the bolt the rear end of the same is inserted be tween the arms and through the opening 41 in the base, this opening being preferably flared rearwardly topermit the bolt to extend through the same in an inclined position. lVhen the bolthas been inserted through the opening 41 a'distance sufficient to bring the head thereof into line with the grooves 50 the head of the bolt is moved into a position between the arms in which it will engage the shoulders 47 and is then drawn tight.

It will be obvious from the foregoing description that I have provided a two-part tooth which is of a very strong rigid construc tion and which can be manufactured 'ata relatively low cost and that the two parts of this tooth are so connected one to the other that the strains will be imposed between the contacting portions of the point and the base and the connecting device will not be sub jected to strain in normal operation. The nut on the connecting bolt is protected against injury by its location but is readily accessible and there is ample clearanceabout the same to permit a wrench to be applied thereto. In the event of the breakage or loss of the con necting bolt the point of the tooth will not understood that I do not desire to be limited" to the details thereof as various modifications may occur to a person skilled in the art.

Having now fully described my invention, what I claim as new and desire to letters Patent, is:

1. A dipper tooth comprising a base and a point, one of said members having a socket, the wall of which is curved about an axis transversely to said member to form a bearing and has an opening therein, the other of said members having a part arranged to be fully inserted in said socket through said opening in the wall thereof while said point is tilted with relation to said base and to have bearing contact with said wall when said point is turned in said socket to its normal position with relation to said base.

2. A dipper tooth comprising a base and a point, said base and said point having interlocking parts to connect the same one to the a other, a connecting device extending lengthwise of said tooth through the lower portions of said point and said base to draw said interv locking parts into snug engagement one with the other, said interlocking parts and said connecting device being so arranged that in the normal operation the strains will be imposed on said interlocking parts and any strain imposed on said connecting device will be in the direction of its length.

3. 'A dipper tooth comprising a base and a point, one of said members having a transverse socket'having its upper portion open and the other of said members having a late-rally extending part adapted to enter said socket through'the open upper portion thereof and to bear against the wall thereof when said members are in their normal operative positions.

4. A. dipper tooth comprising a base and p a point, one of said members having in the upper portion thereof atransverse socket which opens through .the upper edge thereof and the other of said members having on an adjacent portion thereof a laterally extending part adapted to enter said socket through the opening in theupper portion thereof and said members also having other parts near. the lower portion thereof arranged to have butting contact when said first mentioned part is seated in said socket and said point and base are in their normal operative positions.

5. A dipper tooth comprising a base and secure by,-

a point, one of said members having a trans verse socket and the other of said members having a laterally extending part adapted to enter said socket, to having turning move-' menttherein and to bear against the wall 7(- thereof when said parts are in their normal operative positions, and a connecting device extending lengthwise of said'tooth to draw I said members into sung engagement one with the other.

6. A dipper tooth comprising a base and a point, one of said members having in the upper portion thereof a transverse socket and the other of said members having on an adjacent portion thereof a laterally extending 8b 'partadapted to enter said socket and to have turning movement therein, and said members also having other parts near the lower portions thereof arranged to have butting contact when said first mentioned part is seated in said socket and said point and base are in their normal operative positions, and a bolt arranged in the lower portions of said base and said point and extending lengthwise thereof to draw said parts into firm butting 1 engagement.

7 A dipper tooth comprising a base and apoint, one of said members having a transverse socket the upper portion of which is open and the other of said members having a laterally extending lug adapted to enter said socket through the open upper portion thereof and tohave turning movement therein, said lug and said socket being so shaped that the lug can enter the socket only when isaid point is in an abnormal position with relation ;to said base and will be retained therein'when said point is in its normal position with relation tosaid base.

- 8. A dipper tooth comprising a base and a point, one of said members having a transverse socket, the upper portion of which is open and the other of said members having a laterally extending lug adapted to enter said socket through the upper portion thereof and 1 l to have turning movement therein, said lug and said socket being so arranged that the lug can enter the socket only when said point is in an abnormal position with relation to said base and will be retained therein when said pomt is in its normal position with relation to said base, and a connecting device acting on the lower portions of the two members of said tooth to draw said membersinto snug engagement and to retain said point in its 5 normal position with relation to said base.

9. In-a dipper tooth, a base having a forwardly extending portion provided with a transverse socket, and a point having a rear portion arranged alongside the forwardly ex- 1*- tending portion of said base and provided with a laterally extending part adapted to movement transverseto the axis about which said part turns, parts of said base and said point being arranged to hold the point against lateral displacement with relation to said base, and a connecting device to draw said pointinto snug engagement with said base.

10. In a dipper tooth, a base having a forwardlyrextending portion, the lower surface of which is spaced above the bottom of said base and which is provided in its upper edge with a transverse socket, and a point having a part adapted to be inserted in said socket and rotated therein, and having another part arranged to extend beneath the forwardly extending portion of said base and abut against the transverse portion of said base, and a connecting device extending lengthwise of said point into engagement with said base.

11. In a dipper tooth, a base having a forwardly extending portion provided with a transverse socket, and a point having upper and lower rearwardly extending portions, the upper portion having a laterally extending part adapted to be inserted in said socket and to have turning movement therein and the lower portion of said point being arranged to extend beneath the forwardly extending portion of said base with its rear end in engagement with said base.

12. In a dipper tooth, a base having a forwardly extending portion provided with 'a transverse socket opening through the upper edge thereof, and a point having upper and lower rearwardly extending portions, the upper portion of said point having a lug arranged to be fully inserted in said socket through the open upper portion thereof when the forward end of said point is in an elevated position with relation to said base and rotated therein by the movement of said point into line with said base, and the lower portion of said point being arranged to extend beneath the forwardly extending portion of said base when said point is moved into line with said base, and means to retain said point in line with said base.

13. In a dipper tooth, a base having a forwardly extending portion the lower surface of which is spaced from the bottom of the base to provide a forwardly facing shoulder, said forwardly extending portion having a transverse socket opening through its upper edge, and a point having upper and lower rearwardl extending portions, said upper portion 0 saidpoint having a part adapted to enter said socket through the open upper portion thereof and to have pivotal movement about a transverse axis therein and the lower portion of said point being' arrangedto extend beneath the forwardly extending portion of said base and to abut against said of which is spaced above the bottom of said base to provide a forwardly facing shoulder, said forwardly extending portion having at 'its upper edge a transverse socket, and a point having upper and lower real-wardly extend ing portions, said upper portion of said point having a part adapted v to enter said socket and to have pivotal movement. therein and the lower portion of said point being arranged to extend beneath the forwardly extending portion of said base and to butt against said shoulder, and a bolt connected with said lower portion of said point and extending through the shoulder of said base to retain said point in line with said base.

15. In a dipper tooth, a base having a forwardly extending portion comprising a relativel \"narrow projection and parts extending lengthwise of and rigidly connected with said projection on the respective sides thereof, said projection having a transverse socket in the upper edge thereof, and a point having a pair of arms arranged to embrace said projection on said base and provided with a part adapted to enter said socket and to have pivotal movement therein, said. point and said base having other parts arranged below said socket for butting contact to limit the movement. of said point about its pivotal connection with said base;

16. In a dipper tooth "base having a forwardly extending poi ion comprising a relatively narrow projection and parts extending lengthwise of and rigidly connected with said projection on the respective sides thereof, said projection having a transverse socket in the upper e ge thereof, and a point having a pair of arms arranged to embrace said projection on said base and provided with a part adapted to enter said socket. and to have pivotal movementtherein,said point and said base having other parts arranged below said socket for butting contact to limit the movement of said point about its pivotal connection with said base, and means to hold said butting parts of said point and base in contact one with the other.

17. In a dipper tooth, a base having a forwardly extending portion provided with a transverse socket the upper portion of which is open, and a point having rear-wardly extending upper and lower portions, said upper and lower portions each having a transversely extending lug, said real-wardly extending portions of said point being so arranged with relation to said forwardly extending portion of said base that the lug on either of the rearwardly extending portions of said point may be inserted in said socket through the open upper portion thereof and have turning movement therewith and the other of said rearwardly extending portions ofsaid' point moved into contact with 'another part of said base spaced from said socket. t

18. In a dipper tooth, a base having a fortions, each of said portions being bifurcated and having a transverse lug, said rearwardly' extending portions being so arranged that either portion of said point may constitute the upper portion thereof and may be caused to embrace the forwardly extending projection of said base with said transverse lug seated in said socket and with the other portion ofesaid point extending beneath said projection and in contact with said shoulder,

19. In a dipper tooth, a base having a forwardly extending portion comprising a relatively narrow rib, lateral projections extending lengthwise of said rib but of less length and of less width than said rib, the lower portions of said rib and said projections being spaced above the bottom of said base and said rib having a transverse socket arranged above the level of the upper edges of said projections, and a point having upper and lower rearwardly extending portions, one of said rearwardlyextending portions having a vertical slot to receive the forward portion of said rib and having a trans verse lug to enter said socket, and the lower portion of said point being arranged to extend beneath said forwardly extending portion of said base and to engage said shoulder, said upper and lower portions of said point having those parts on the opposite sides of said rib in engagement with. the respective projections on said base. v

20. In a dipper tooth, a base having a forwardly extending portion comprising a central rib and longitudinal projections extend-' ing lengthwise of said rib on the opposite sides thereof and of less length and width than said rib, the lower surface of said forwardly extending portion being spaced abovethe bottom of said base to provide a shoulder, and said rib having a transverse socket in theupper edge thereof, and a point comprising two pairs of rearwardly extending arms, the two pairs of arms being spaced one from the other and the arms of each pair being spaced one from the other, and both pairs of arms being provided with parts adapted to enter said socket, said arms being so arranged that either-pair thereof may be caused to embrace the rib of said base with said part thereof seated in said socket and when one pair of arms is so engaged with said rib the other pair of" arms willextend beneath the forwardly extending portion of said base to engage said shoulder, the arms on the respective sides of said point being arranged to contact with. the corresponding projections on said base.

21. In a dipper tooth, a base having a forwardly extending portion provided with a transverse socket, and having its lower surface spaced above the bottom of said base to provide a shoulder, said shoulder having recesses in the opposite ends thereof, and a point comprising two pairs of rearwardly extending arms, the two pairs of arms being spaced one from the other and the arms of each pair being spaced one from the other,-

whereby the two pairs of arms may be arranged respectively above and below the forwardly extending portion of said base, the upper pair of arms having a part to enter said socket and the rear ends of the lower pair of arms being seated in the respective recesses in said shoulder, and means for retaining the last mentioned pair of arms in engagement with said shoulder.

In a dipper tooth, a base having a forwardly extending portion' provided with transverse sockets arranged in line one with the other, and a point having a rearwardly extending portion adapted to overlap the forwardly extending portion of said base and provided with lugs adapted to enter the respective sockets and to have turning movement therein, said point also having a part arranged to engage said base at apoint spaced from said sockets.

23. In a dipper teeth, a base having a forwardly extending portion provided in its upper edge with a pair of transverse sockets ing 'portion of said base and having lugs adapted to enter the respective sockets and to have pivotal movem'ent'therein, said point also having a part arranged to engage said base at-a point beneath said sockets to limit the pivotal movement of the point with relation to said base. 7

24. In a dipper tooth, a base having a forwardly extending portion provided in its upper edge with a pair of transverse sockets arranged in line one with the other and having'their upper portions open, and a point comprising a rearwardly extending portion arranged to overlap the forwardly extending portion of said base and having lugs adapted to enter the respective sockets and to have pivotal movement therein, said point also having apart arranged to engage said base at a point beneath said sockets to limit the pivotal movement of the point with relation to said base, and a device for retaining said last mentioned part of said point in contact with said base.

25. In a dipper tooth, a base having a forwardly extending portion provided with transverse sockets opening through the upper surface thereof and arranged in line one with the other, the lowersurface of said forwardly extending portion being spaced above the bottom of said base to provide a shoulder,

and a point having a pair of rearwardly ex,

tending arms arranged to overlap the forwardly extending portion of said base and provided withlugs adapted to enter the respective sockets and to have pivotal movement therein, said lugs and said sockets being so shaped that the lugs can be inserted in the sockets only when the forward end of said point is elevated with relation to said base, said point also having a portion arranged to extend beneath said forwardly extending portion of said base and to be moved into engagement with said shoulder when said point is moved from said elevated position to its normal posit-ion with relation to said base.

26. In a dipper tooth, a base having a forwardly extending portion comprisinga central rib provided in its opposite sides with sockets which open through the upper surface thereof, and longitudinal projections arranged on the respective sides of said rib, and a point having a pair of rearwardly extending arms spaced one fronr the other to embrace said rib and to overlap the respective projections, each of said arms having a laterally extending lug adapted to enter the adjacent socket in said rib, said point also having another portion arranged to engage said base at a point below said socket to limit the movement of the pointwith relation to the base in one direction.

27. In a dipper tooth, a base having a forwardly extending-portion the lower surface of which is spaced above the bottom of said base to form a shoulder and which comprises a central rib and longitudinal projections arranged on the respective sides of said rib and spaced below the upper edge thereof, said rib having sockets opening through the upper surface thereof, and a point havingtwo pairs of rearwardly extending arms, the arms of each pair being spaced apart and having inwardly extendinglug: adapted to enter the respective sockets in said rib, and the two pairs of arms being so arranged with relation one to the other that when the upper pair has been so connected with said base the arms of the other pair will be moved into a position beneath the forwardly extending portion of said base and in contact with said shoulder.

, 28. In a dipper tooth, a base having a for-' wardly extending portionthe lower surface I of which is spaced above the bottom of said base to form a shoulder and which comprises a central rib and longitudinal pro ections arranged on the respective sides of said rib and spaced below the upper edge thereof, said rib having sockets opening through the upper surface thereof, and a point having two pairs of rearwardy extending arms, the arms of each pair being spaced apart and having inwardly extending lugs adapted to enter the respective sockets in said rib, and the two pairs of arms being so arranged with relation one to the other that when the upper pair has been so connected with said base the arms of the other pair will be moved into a position beneath the forwardly extending portion of said base and in contact with said shoulder, the projections on said arms being provided at their forward edges with recesses, and a bolt having its head seated in said re cesses and extending rearwardly between said arms and through said shoulder to retain said point in line with said base.

29. In a dipper tooth, acbase provided with a'forwardly extendig part having its upper portion recessed and a wedge shaped point having its rear portion bifurcated to provide lateral portions adapted to .embrace the forwardly extending part of said base, the lateral portions of said point having lugs to simultaneously engage the recessed portion of said base for pivotal movement with relation thereto.

30. A. dipper toot-h comprising a base and a point, said members having port-ions arranged side by side, one of said portions having a socket opening through the lateral face thereof and through an edge thereof and the other of said portions having a latsocket through the opening in the edge of said portion and to bear against the wall of said socket when said members are in their normal operative positions.

31. In a dipper tooth, a base having a forwardly extending portion, a point having upper and lower rearwardly extending portions, the upper portion of said point and said base having interlocking parts, and the lower portion of said point being arranged beneath said forwardly extending portion of said base with its rear end in engagement with said base, said lower portion of said point having a longitudinal slot in the rear part thereof and having shoulders on the opposite.

sides of said slot and below the forwardly extending portion of said base, a bolt arranged in said slot with its head in contact with said shoulders and extending through a part of said base. i v

In testimony whereof, I afiix my signature hereto.

I/VALTER E. MILEY.

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