US2739395A

US2739395A - Tip holder and tip for bucket and dipper teeth

Info

Publication number: US2739395A
Application number: US301361A
Authority: US
Inventors: Arvin V Stratton
Original assignee: Individual
Current assignee: Individual
Priority date: 1952-07-28
Filing date: 1952-07-28
Publication date: 1956-03-27
Anticipated expiration: 1973-03-27

Description

March 27, 1956 A. v. STRATTON TIP HOLDER AND TIP FOR BUCKET AND DIPPER TEETH 2 Sheets-Sheet 1 Filed July 28, 1952 INVENTOR. ARV/N L 57/?4770/1 My 77% a 147 TUE/V515 March 27, 1956 A. v. STRATTON 2,739,395

TIP HOLDER AND TIP FOR BUCKET AND DIPPER TEETH Filed July 28, 1952 2 Sheets-Sheet 2 INVENTOR. /4/1 1 //v 11 57/64 770v M MM ATTORNEY? United States Fatent TIP HOLDER AND TIP FOR BUCKET AND DIPPER TEETH Arvin V. Stratton, Cedar City, Utah Application July 28, 1952, Serial No. 301,361

8 Claims. (Cl. 37142) This invention relates generally to the earth digging teeth on dippers, buckets, etc., and more specifically to a tip holder and tip for each tooth on such earth digging devices.

One of the objects of the invention is the provision of a tip that is adapted to be secured to the digging end of each of the teeth on a dipper, bucket or other similar earth digging device, and which tip is so constructed as to be easily welded onto each tooth and that includes a hard metal filling so carried and disposed within the tip as to provide a cutting edge that will last much longer than has heretofore been the case.

Heretofore teeth have been made for buckets and for clippers that have a hardened leading portion that includes the cutting edge and that encloses, or is outside the trailing main body, and such attempts as have been made to employ hardened material within the body have consisted of inserts around which the body of each tooth has been molded. There has been no tip structure enabling a standard tooth to be re-tipped, and where separate spaced inserts have been used, or where the inserts have extended into the body of the teeth substantially from their forward to their rear ends, not only has the expense of making the teeth been objectionably high, but the likelihood of undiscoverable flaws in the molding and in the bonding of the inserts with the body of each tooth is increased to the point where such teeth have not been deemed to be satisfactory.

With applicants structure, while the holder for the hard filling may be cast around the latter, the filling and the holder are usually made separately and then combined, or the filling may be melted into place and fused with the holder or the filler may be pre-formed and welded into position. These steps may be taken before or after the holder has been Welded to the tooth.

With reference to previous structures in which the harder metal has enclosed the leading edge of each tooth and has included the cutting edge, it may be stated that this harder metal has been only about 44 to 45 Rockwell hardness since anything harder would peel oif, but with the present invention a metal filling having from 44 to 65 Rockwell hardness can be used, depending upon the type of digging.

By fusing the filling to the softer metal enclosing it, the softer metal will wear down to the harder metal when the latter will take the brunt of the work and the life of the teeth will be increased from 50% to 300% over conventional tooth structure and structure in which the hardened metal is on the outside.

Other objects and advantages will appear in the description and in the drawings.

In the drawings,

Fig. 1 is a perspective view of the holder for the harder metal.

Fig. 2 is a perspective view of either the holder of Fig. l or 4 as it would appear with the harder metal in the holder.

2,739,393 Patented Mar. 27, 1956 ice Fig. 3 is a lateral side elevational view of a holder that is slightly diiferent from that shown in Fig. 1.

Fig. 4 is a front edge view of the holder of Fig. 3 as seen from the right hand side of Fig. 3.

Fig. 5 is a perspective view of a conventional weld-on tooth having the present invention secured thereto.

Fig. 6 is a perspective view of a conventional tooth having the present invention secured thereto.

Fig. 7 is a reduced size perspective view of a filler of hard metal for the holder of Fig. 3, 4, without the holder.

Fig. 8 is a reduced size perspective view of a filler of hard metal for the holder of Fig. 1.

In detail, referring to Figs. 1, 2 the tooth tip to be secured to a conventional tooth for an earth digging device, such as a dipper or bucket and the like, comprises a tip holder of metal, generally designed 1. Such dipper or bucket has a. row of teeth along the leading lower edge and a holder of the type herein described is suitable for each tooth.

The upper and lower sides of the holder 1 may have any desired degree of taper according to the taper of the tooth to which the holder is to be welded.

The forward edge of holder 1 is formed with a recess 2 that opens forwardly of said holder, and the said recess 2 communicates at its ends with laterally outwardly opening recesses 3 of corresponding shape, and which recesses 3 extend substantially the length of each of the lateral edges or sides of the holder. Preferably, said recesses 3 start at about the ends of the rear edge 4 of the holder and become progressively deeper as they extend forwardly as clearly seen in Fig. 1.

The forward edge of the holder in which the recess 2 is formed is usually straight, and the side edges in which recesses 3 are formed are also straight, although for the purpose of this invention they are not necessarily so.

The base end of recess 2 terminates at 5 within the body of the holder providing a solid backing of metal of the holder between said closed base end of the recess and the rear edge 4 of the holder. Preferably the sides of recess 2, and also the sides of each recess 3 extend slightly convergently from the edges of the holder in which they are formed. Thus the side walls of the recesses will become progressively thicker as they extend inwardly from the free edges of the holder.

In the form of the invention as seen in Figs. 1, 2 partial partitions 6 may be formed in recess 2 which partitions or projections extend perpendicular to and toward the forward edge of the holder. The omission of these partial partitions is the only difference between the holder structure of Figs. 1, 2 and that of Figs. 3, 4.

The rear edge 4 of the holder may extend convergently from the rear ends of the lateral sides of the holder in a direction generally toward or away from the forward edge, or it may be straight or of any other desired contour. However, by making it convergent and by also making the cross sectional contour of the rear edge of U- or V-shape, either reentrant or projecting, a relatively simple means is provided for centering the holder on the complementarily shaped leading end of the tooth to which the holder is to be welded. Also this contributes toward more securely holding the tip on the tooth.

In Figs. 3, 4 the holder is identical with the holder of Figs. 1, 2 except that the recess 10 along the forward edge of the holder does not have the partial partitions 6. Therefore, except for the recess 10, the same numbers will be shown as in Figs. 1, 2.

The

recesses

10 and 3 are adapted to receive a harder metal filler having legs 11 (Fig. 7) that fit recesses 3 and a cross piece 12 that fits recess 10. A similar structure is shown in Fig. 8 for the holder of Figs. 1 2 in which the legs 11 that are identical with the legs 11 of Fig. 7 are provided, and cross piece 13 is for the recess 2, said crosspiece being accessed at 1 4 for the partitions 6. In each case the legs 11 that fit within recesses 3 connect with the ends of the cross piece 12 or 13 and thus an extension of the legs extends into recess 2 or It) as the case may be. i

The holder 1 may be of the same ihardness as that of the conventional teeth :of the bucket .or dipper, but the filler for the recesses may range 44 to 65 Rockwell hardness or even harder. in this connection, it will be understood that the desired hardness will depend on the type of .material to be encountered in the digging process. The bodyri ofthe liolderis, of course, relatively soft as compared with thehardness of the filler.

Where the partitions are used, they may extend to the cutting edge or only partially extend thereto and are useful in certain types of digging to :actas braces to keep the harder metal in place .and to strengthen the softer metal on the outsideto resist .any tendency to chip away or to break.

'When this hard metal diller is fused to the softer metal on the outside, the softer metal will only wear down to the harder metal, and when this point is reached the filling takes the brunt of the job and will increase the life of the conventional point from 100 to 300% depending on the kind or type of digging done, and will at least double the life of the point or tooth in the hardest type of digging.

When the point of the construction hereinbefore described is used, the softer :metal on .the lower side of the point will Wear down only a certain distance and the softer metal will act vas .a brace or cushion .for the filler.

On any job the holder .may be provided with or without the filling and the filling of the desired hardness may be fused with the holder and in the recess :by any capable welder that is on said job. Preferably the filling is secured to the holder with :silver solder although obviously any suitable means may be employed.

Some teeth, as indicated at 15 in Fig. 5, have a weld-on tip 16 or as seen in Fig. .6, it may be welded onto a standard tooth 17 that does not have the structure '16 of Fig. 5. There are many other types of structure for teeth, but the present invention is applicable to most of them, if not all.

I claim: 7

l. A tip for a digging tooth of an earth digging device such as a bucket, .diPPerzand the like comprising; a metal holder having a rear edge to :be secured to the leading end of such tooth, a forward edge opposite said rear edge, opposite lateral edges extending between the corresponding ends of said rear edge and saidfonward edge, and upper and lower sides extending :convergently from said rear edge to .said forward edge, said holder being formed with opositely outwardly opening recesses along said lateral edges and being formed with ;a forwardly opening recess along said forward edge for receiving a metal filling of generally U-shape :and of substantially greater hardness than :that of .said holder, the recesses formed in said lateral edges and in said forward edge communicating with each other at the adjoining ends of said lateral and forward edges'to provide a1continuous recess along .said forward .and lateral edges of generally U- shape in linear contour.

2. A tip for a digging tooth ofan earth digging :device such as a bucket, dipper .and the like comprising; a metal holder having .a -rear edge to be secured to the leading end of such :tooth, a forward edge opposite .said rear edge, opposite lateral edges extending between the corresponding ends of said .rear :edge and said nfonward edge, and upper and lowerrsides extending convergently from said rear .edge to said forward edge, said-holder being formed with oppositely outwardly opening recesses along said lateraledges and being formed with a forwardly opening recess along said forward edge for receiving a metal filling of :generally 'U-sh'ape and 'of substantially 7 leading end of such tooth .a :forward edge opposite :said

rear edge, opposite lateral edges extending between the corresponding ends of said rear edge and said forward edge, and upper and lower sides extending convergently from said rear edge to said -forward edge, said holder being formed with oppositely outwardly opening recesses along said lateral edges and being formed with a forwardly opening recess along said forward edge for receiving a metal filling of generally U-shape and of substantially greater hardness than that of said holder, the recess formed on said forward edge terminating within said holder a substantial distancelfrorn said rear edge and the recesses in said lateral edges extending a substantial distance beyond the bottom of the recess in said forward edge, a partition extending from-said forward-edge toward said rear edge at a point intermediate said lateral edges.

4. A tip for a digging tooth "of-an earth digging device such as a bucket, dipper and the like comprising; a metal holder having a rear edge to be secured to the leading end of such tooth, a forwardedge opposite said rear edge, opposite lateral edges extending between the corresponding ends of said rear edge and said forward edge, and upper and lower sides extending convergently from said rear edge to said forward edge, said holder being formed with oppositelyoutwardly opening recesses along said lateral edges and being forme'd with a forwardly opening recess along said for-ward edge for receiving a metal filling of generally -U-shape and of substantially greater hardness than that of said holder, said rear edge extending slantingly and generally convergently from said lateral edges linearly thereof and also extending slantingly and convergently in cross sectional contour from said upper and said lower s'ides'to facilitate positioning and securelyattaching said holderto the complementarily formed leading edge of such teeth.

5. A tip for a digging tooth of an earth digging device such as a bucket, dipper and the like comprising; a metal holder having a rear edge to be secured to the leading end of such tooth a'forward edge opposite said :read edge, opposite lateral edges extending bet-ween the corresponding ends of said rear edge and said forward edge, and upper and lower sides extending 'convergently from said rear edge to said forward edge, said holderbeing formed with oppositely outwardly opening recesses along said lateral edges and being formed with a forwardly opening recess along said forward 'edge for receiving a metal filling of generally t l-shape and of substantially greater hardness than that of said holder, a filler of substantially harder metal than that of said holder within the recesses formed insaid lateral and forward edges and fused to the metal of said holder said oppositely outwardly opening recesses communicating at one :of theirends'with the ends of said forwardly opening recess to provide a continuous recess of generally U-shape in linear contour, and said filler being of similar shape in linear contour.

6. A tip for a digging tooth of an earth digging device such as a bucket, dipper and the like comprising; a metal holder having a rear edge to be secured to the leading edge of such tooth, a forward edge opposite said rear edge, opposite lateral edges extending between the corresponding ends of said rear edge and said forward edge, and upper and lower sides extending convergently from said rear edge to said forward edge, a forwardly opening recess formed in said forward edge'and extending to each forward corner and a laterally outwardly opening recess formed .in each of said "lateral edges communicating at said corners with each first mentioned recess, the recesses in said lateral edges being elongated in direction away from said corners and toward said rear edge, a filler of substantially harder metal than that of said holder secured in said recesses filling them and bonded with the metal of said holder against separation from the latter.

7. A tip for a digging tooth of an earth digging device such as a bucket, dipper and the like comprising; a metal holder having a rear edge to be secured to the leading edge of such tooth, a forward edge opposite said rear edge, opposite lateral edges extending between the corresponding ends of said rear edge and said forward edge, and upper and lower sides extending convergently from said rear edge to said forward edge, a forwardly opening recess formed in said forward edge at each forward corner and a laterally outwardly opening recess formed in each of said lateral edges communicating at said corners with each first mentioned recess, a filler of substantially harder metal than that of said holder secured in said recesses filling them and bonded with the metal of said holder against separation from the latter, the said laterally outwardly opening recesses extending substantially to the ends of said rear edge and being progressively deeper in direction from said rear edge toward said for- Ward edge, and said recesses along the said forward edge at each of said corners extending along said forward edge to meeting relationship 8. A metal tooth for the earth digging edge of a bucket comprising: a body having a rear edge, two opposite lateral edges, a forward edge, and upper and lower surfaces extending convergently from said rear edge toward said forward edge, a shank secured to said rear edge and References Qited in the file of this patent UNITED STATES PATENTS 1,778,213 Fahrenwald Oct. 14, 1930 1,867,871 Birkenbeuel July 19, 1932 2,148,925 Bochy Feb. 28, 1939 2,369,285 Daniels et al Feb. 13, 1945