US1440212A

US1440212A - Base for bipper teeth

Info

Publication number: US1440212A
Authority: US
Publication date: 1922-12-26
Anticipated expiration: 1939-12-26

Description

Dec. 26, 1922. 1,440,212.

J. F. DEVLIN.

BASE FOR DIPPER TEETH HLED DEC-30.1921.

//// Q T 6: gwuwntoi Patented Dec. 26, 1922.

UNITED srA'rss PATENTIOFFICE.

JOHN F. DEVLIN, OF HIGH BRIDGE, NEW JERSEY, ASSIGNOR TC TAYLOR-WHARTON IRON AND STEEL COMPANY, OF HIGH BRIDGE, NEW JERSEY, A CORPORATION 0F s NEW JERSEY.

BASE FOR DEPT-ER TEETH.

Application filed December 30, 1921. Serial No. 525,988.

To all whom it may concern:

Be it known that I, JOHN F. DnvLDI, a citizen of the United'States, residing at High Bridge, in the county of Hunterdon and State of New Jersey, have invented certainnew and useful Improvements in Bases for Dipper Teeth, of which the following is a specification.

This invention relates to excavating, dredging, digging and similar machinery, and more particularly to the carrying members or bases which support and carry the digging teeth of the clippers or buckets. Such bases are usually formed with a forwardly extending wedge-shape nose portion to receive the dipper tooth and with rearwardly extending reaches which are riveted or bolted to the bucket. Sometimes the bases are forged, but the standard practice is to cast them from alloy steel, such as manganese steel. The preponderance of metal at and in the region of the nose precludes proper heat treatment. it results that comparatively thin sections of metal, where the stress is practicably negligible, have the usual toughness and shock and wear resistive properties characteristic of manganese steel properly heat treated, while the mass of metal at the nose, or region of severest stress, is inherently weak because of a localization of cementite due to lack of heat treatment, faulty or non-uniform heat treatment. This condition accounts in the main for the breaking of bases. I

The object of my invention is to provide a cast base, whereof the metal is so distributed as to insure substantial uniformity of heat treatment, and which, while obviating the inherent wealmesshereinbefore mentioned, also makes for rapid production inasmuch as it does not require an individual or special cope or a separate core to be hung in the cope to remove the metal.

Referring to the annexed drawing forma part hereof,

Figure 1. is a side elevational view of a base embodying my invention. I

Fig. 2. is a section on line 2-2 of Fig. 1.

Fig. 8. is a side elevational view of a modification.

Fig. 4. is a section on line 4:4l of Fig. 8.

Fig. 5. is a side elevational view of a further modification; and

.jig. 6. is a section on line: 6-6 of Fig. 5.

ln practicing my invention 1 remove the metal from the longer reach or arm 5, as indicated in dotted lines, so that the base, for a material portion of its length, is of hollow polygonal or box section, with walls (3 of substantially uniform thickness. In Fig. 1. the hollow or chambered formation extends from the nose 7 rearwardly for substantially two-thirds of the length of the arm or reach 5.

In Figs. 3 and a a substantially tubular base is shown, the core 8 starting with a flare 9 developed in the nose and eventuating at the tail of the base in a channel section 10. p

In Figs. 5 and 6, the chambered or box section 11 stops just beyond the depth of the lower reach, and is then continued in channel form 12.

In all three constructions, I provide for substantiah uniformity of metal sections which makes for proper heat treatment, and incidentally obtain all of the advantages of an I-beam section as regards strength and resistance to bending.

The nose 7 of the base may be of the usualor any appropriate form, and, except in the important particular noted as regards the essence of the invention, the base may be as usual.

Having described the nature and object of my invention, I claim,-

1. A base for dipper teeth having a material part thereof of hollow polygonal section.

2. A base for dipper teeth having a material part thereof of box section with walls of substantially uniform thickness.

3. A base for dipper teeth of hollow polygonal section in the region of the nose to provide for uniformity of heat treatment.

i. A. base for dipper teeth of hollow polygonal section at and in the region of the nose, and thence continued in channel form.

5. A base for dipper teeth whereof the. main arm or reach is of hollow polygonal. section in its thickest portion with walls of uniform thickness and terminating in channel section.

6. A base for dipper teeth having an axial cored portion starting at the nose and terminating at the tail.

7. A base for dipper teeth having an unthickness, said box section eventuating in 10 interrupted axial cored portion. 7 a solid tail portion. V

8. Abase for clipper teeth, having ana-xial 1 0. A-cast manganesesteel base fordipper cored portion the effective length thereof, teeth having a box section nose and a sub 5 and Which is flared at the nose. stantially channel section tail to thereby 9. A base for dipper teeth hav'ingthe preprovide-substantially uniforfn thicknesses of 15 p'ondera-nt mass of metal at and in the vi metal for heat treatment purposes. cinity of the nose of endWise directed box In testimony whereof I affiX mysignetm'e' section With walls of substantially uniform JOHN F. DEVLIN.