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US3300883A - Reversible digging tooth with three cutting edges - Google Patents

Reversible digging tooth with three cutting edges Download PDF

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Publication number
US3300883A
US3300883A US317541A US31754163A US3300883A US 3300883 A US3300883 A US 3300883A US 317541 A US317541 A US 317541A US 31754163 A US31754163 A US 31754163A US 3300883 A US3300883 A US 3300883A
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Prior art keywords
tooth
ribs
edge
reversible
digging
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US317541A
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William M Troeppl
Gerald A Petersen
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PETERSEN
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PETERSEN
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    • E—FIXED CONSTRUCTIONS
    • E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02F—DREDGING; SOIL-SHIFTING
    • E02F9/00—Component parts of dredgers or soil-shifting machines, not restricted to one of the kinds covered by groups E02F3/00 - E02F7/00
    • E02F9/28—Small metalwork for digging elements, e.g. teeth scraper bits
    • E02F9/2808—Teeth
    • E02F9/2858—Teeth characterised by shape

Definitions

  • This invention relates to a new and improved reversible digging tooth with ribs on the tooth surface to confine wear so that the tooth assumes a predetermined shape as it is used.
  • a particular feature of the present invention is the formation on the top and bottom forwardly-converging distal surfaces of the tooth of reinforcing ribs, extending longitudinally adjacent but spaced inwardly from the side margins of the tooth. It will be understood that as a digging tooth is subjected to use, the forward edge of the tooth tends to be worn away. Further, when the tooth is used on an auger, the side edges of the tooth are like wise subjected to wear by reason of the rotary motion of the tooth, particularly when such tooth is held in an auger head of the type shown in Patent No. 2,578,014.
  • ribs on the top and bottom surfaces of the tooth which in practical effect comprise enlargements of the vertical cross-section of the tooth, retard wear of the toot-h at the cutting edge vicinal the forward end of the rib.
  • the present invention locates such reinforcing ribs in preferred locations so as to obtain a beneficial effect from the inherent wear of the tooth.
  • a pair of prongs forms at the leading edge of the tooth, which prongs perform an efiective digging function.
  • Such prongs are spaced inwardly from the side edges of the tooth and are spaced apart with a thinner cross-section of the tooth between the two prongs.
  • a cutting blade is in practical effect formed along the side edges of the tooth which is particularly effective in digging side clearance in an auger.
  • a feature and advantage of the present invention is that the location of the ribs, as hereinbefore explained, prolongs the life of the tooth and also, after the tooth wears, makes its digging action more effective.
  • a still further feature of the invention is the fact that reversal of the tooth prolongs the life of the tooth and reduces the frequency of sharpening, grinding or replacing the same without diminishing the effectiveness of the digging action of the tooth.
  • the tooth is particularly suitable for use in boring a hole with an auger of the type shown in Patent No. 2,578,014, where the tooth is slanted at an angle.
  • the front edge of the tooth performs a major portion of the cutting action.
  • the blade of the tooth is rectangular in plan, a portion of the outside side edge as well as a portion of the inside side edge also perform digging action because such edge portions travel slightly radially outward or inward, respectively, as the tooth revolves.
  • a principal feature of the present invention is the provision of ribs extending longitudinally spaced inwardly from the side edges. Such ribs permit thin front and side cutting edges without undue sacrifice of strength. At the same time, any adverse effect on boring caused by the ribs is compensated for to a substantial extent by 3,300,383 Patented Jan. 31, 1967 the improved boring accomplished by the thin edges, and this is particularly true after the tooth has been reversed.
  • FIG. 1 is a fragmentary view of a tooth in accordance with this invention viewed from the side, together with a portion of the tooth holding structure.
  • FIG. 2 is a cross-sectional view, taken substantially along the line 2-2 of FIG. 1.
  • FIG. 3 is a top plan view of the tooth, in new condition.
  • FIG. 4 is a sectional view taken substantially along the line 44 of FIG. 3.
  • FIG. 5 is a fragmentary view similar to FIG. 3, showing the tooth after it has worn partially.
  • FIG. 6 is a sectional view along line 6.--6 of FIG. 5 showing the tooth after wear.
  • Patents Nos. 2,877,574, 2,952,085 and 2,968,880 which said patents show various means for retaining a tooth of this type in a holder.
  • a holder may be formed integrally with or attached to a digging implement, such as auger, trencher, or other excavating machine.
  • Tooth 11 is shown held in a shank 12, or tooth holder, by means similar to that used and described in Patent No. 2,968,880 and not herein illustrated or described in detail.
  • Tooth 11, at its proximal end, has substantially parallel, reversible top and bottom faces 13, 14, and substantially vertical side edges 16.
  • the rear end 17 of the tooth is essentially square and forwardly of the rear end is a central slot 18, having substantially parallel edges 19 which are transverse to top and bottom faces 13, 14, to provide a pair of proximal prongs 21 each of which is preferably rectangular in transverse cross-section.
  • Prongs 17 assist in holding tooth 11 in holder 12.
  • Slot 18 extends forwardly to a forward transverse terminus 22, which is spaced forwardly of the rear end of the toot-h approximately onehalf the length of said tooth.
  • top and bottom distal faces 26, 27, converge forwardly to a blunt transverse cutting edge 25 which, in the initial condition of the tooth, extends straight across the entire width of the tooth (see particularly FIG. 3).
  • Intermediate surfaces 26, 27 and prong surfaces 13, 14 are top and bottom blending surfaces 28, 29, respectively, which are curved and merge the substantially parallel top and bottom surfaces 13, 14 into the narrower converging surfaces 26, 27.
  • a longitudinally-extending upwardly-protruding rib 31 which originates at about the forward end 22 of slot 18 and has its inner edge as approximately a forward projection of wall 19 of slot 18, and has its opposite or outer edge 33 parallel to inner edge 32 at the distal end of the tooth merging in a curved surface 34 to the outside edge 16 of the tooth.
  • the outside edge 33 of rib 31 is spaced inwardly from the outside 16 of the tooth a distance about equal to the width of the tooth and the ribs 31 are spaced apart about four times the width of the ribs-which is also about one-half the overall width of the distal end of the tooth.
  • the thickness of ribs 31 diminishes from a maximum at their originations to a minimum at end 25.
  • the maximum thickness of each rib is about 7 and the maximum thickness between faces 13, 14, about (These dimensions being for a tooth width of two inches.)
  • FIG. 5 it will be seen that after the tooth has been used as in an auger, wear occurs.
  • the leading edge curves backwardly between the ribs 31, and to either side of the ribs 31, as indicated by reference numeral 42, the sides are worn away in a diagonal line.
  • This forms two prongs 43 at the front of the tooth which perform an efiective digging action.
  • the edge 42 is relatively shar-p by reason of the wearing away of the thin portion 36 on either side edge of the tooth.
  • the resultant tooth having forwardly extending prongs 43 may be used effectively and efiiciently to prolong the life of the tooth. Further, as the ribs 31 wear, the tooth may be inverted and reused.
  • a tooth formed of a unitary piece of material comprising a proximal portion formed to provide means for attachment to a cooperating tooth-holder and a distal portion, said distal portion having a thin transverse front cutting edge, thin side edges extending rearwardly of said front cutting edge and forwardly converging top and bottom faces, said faces inwardly from each said side edge being spaced apart from each other a distance substantially greater than the thickness of said side edges, said side edges being substantially of the same thickness as said front cutting edge, said top and bottom faces being formed with longitudinal ribs and at the center of said tooth said faces being spaced apart from each other a lesser distance than at said ribs.
  • each said rib has a Width equal to about one-eighth the width of said tooth and the outer edge of said rib is spaced inwardly from the adjacent side edge of said tooth about oneeighth the width of said tooth.
  • a tooth according to claim 1 in which, spaced approximately halfway up said distal portion, the thickness of said tooth through corresponding ribs on the top and bottom surfaces is about five-thirds the thickness through the tooth intermediate said ribs.
  • a tooth according to claim 1 in which the thickness of said tooth outside said ribs is less than the thickness intermediate said ribs.
  • a tooth according to claim 1 in which said proximal portion comprises a pair of prongs each substantially rectangular in cross-section and divided by a slot extending forward from the proximal end of said tooth, the outside edges of said distal portion being substantially continuations of the parallel outside edges of said prongs.
  • a tooth according to claim 5 in which the thickness of said prongs is greater than the maximum thickness of said distal portion intermediate said ribs and approximately equal to the maximum thickness of said tooth through said ribs.

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  • Engineering & Computer Science (AREA)
  • Mining & Mineral Resources (AREA)
  • Civil Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Structural Engineering (AREA)
  • Earth Drilling (AREA)

Description

Jan. 31, 1967 I w TROEPPL ETAL 3,300,883
REVERSIBLE DIGGING TOOTH WITH THREE CUTTING EDGES Filed Oct. 21, 1965 INVENTORS fl/LL/IM M 72 05;; 6:94;; A. parses! ,4rrazvi/ United States Patent 3,300,883 REVERSIBLE DIGGING TOOTH WITH THREE CUTTING EDGES William M. Troeppl, Santa Clara, and Gerald A. Petersen, Sunnyvale, Calif., assignors, by direct and mesne assignments, of one-half to said Petersen, and one-half to Anita E. Petersen, Saratoga, Calif.
Filed Oct. 21, 1963, Ser. No. 317,541 6 Claims. (Cl. 37-142) This invention relates to a new and improved reversible digging tooth with ribs on the tooth surface to confine wear so that the tooth assumes a predetermined shape as it is used. Reference is made to US. Patents Nos. 2,877,574, 2,952,085 and 2,968,880 on which the present invention is an improvement.
A particular feature of the present invention is the formation on the top and bottom forwardly-converging distal surfaces of the tooth of reinforcing ribs, extending longitudinally adjacent but spaced inwardly from the side margins of the tooth. It will be understood that as a digging tooth is subjected to use, the forward edge of the tooth tends to be worn away. Further, when the tooth is used on an auger, the side edges of the tooth are like wise subjected to wear by reason of the rotary motion of the tooth, particularly when such tooth is held in an auger head of the type shown in Patent No. 2,578,014. Use of ribs on the top and bottom surfaces of the tooth, which in practical effect comprise enlargements of the vertical cross-section of the tooth, retard wear of the toot-h at the cutting edge vicinal the forward end of the rib. The present invention locates such reinforcing ribs in preferred locations so as to obtain a beneficial effect from the inherent wear of the tooth.
Accordingly, as the tooth formed as hereinbefore mentioned wears, a pair of prongs forms at the leading edge of the tooth, which prongs perform an efiective digging function. Such prongs are spaced inwardly from the side edges of the tooth and are spaced apart with a thinner cross-section of the tooth between the two prongs. Further, by reason of the thinness of the tooth between the reinforcing edge and the side margin, a cutting blade is in practical effect formed along the side edges of the tooth which is particularly effective in digging side clearance in an auger.
A feature and advantage of the present invention is that the location of the ribs, as hereinbefore explained, prolongs the life of the tooth and also, after the tooth wears, makes its digging action more effective.
A still further feature of the invention is the fact that reversal of the tooth prolongs the life of the tooth and reduces the frequency of sharpening, grinding or replacing the same without diminishing the effectiveness of the digging action of the tooth. The tooth is particularly suitable for use in boring a hole with an auger of the type shown in Patent No. 2,578,014, where the tooth is slanted at an angle. The front edge of the tooth performs a major portion of the cutting action. However, since the blade of the tooth is rectangular in plan, a portion of the outside side edge as well as a portion of the inside side edge also perform digging action because such edge portions travel slightly radially outward or inward, respectively, as the tooth revolves. For greatest eificiency in digging action the edges which out should be thin, but for practical considerations of strength the edges must be reinforced. A principal feature of the present invention is the provision of ribs extending longitudinally spaced inwardly from the side edges. Such ribs permit thin front and side cutting edges without undue sacrifice of strength. At the same time, any adverse effect on boring caused by the ribs is compensated for to a substantial extent by 3,300,383 Patented Jan. 31, 1967 the improved boring accomplished by the thin edges, and this is particularly true after the tooth has been reversed.
Other objects of the present invention will become apparent upon reading the following specification and referring to the accompanying drawings in which similar characters of reference represent corresponding parts in each of the several views.
In the drawings:
FIG. 1 is a fragmentary view of a tooth in accordance with this invention viewed from the side, together with a portion of the tooth holding structure.
FIG. 2 is a cross-sectional view, taken substantially along the line 2-2 of FIG. 1.
FIG. 3 is a top plan view of the tooth, in new condition.
FIG. 4 is a sectional view taken substantially along the line 44 of FIG. 3.
FIG. 5 is a fragmentary view similar to FIG. 3, showing the tooth after it has worn partially.
FIG. 6 is a sectional view along line 6.--6 of FIG. 5 showing the tooth after wear.
As has heretofore been mentioned, the present invention is an improvement over Patents Nos. 2,877,574, 2,952,085 and 2,968,880, which said patents show various means for retaining a tooth of this type in a holder. Such a holder may be formed integrally with or attached to a digging implement, such as auger, trencher, or other excavating machine.
In the accompanying drawings, the tooth 11 is shown held in a shank 12, or tooth holder, by means similar to that used and described in Patent No. 2,968,880 and not herein illustrated or described in detail. Tooth 11, at its proximal end, has substantially parallel, reversible top and bottom faces 13, 14, and substantially vertical side edges 16. The rear end 17 of the tooth is essentially square and forwardly of the rear end is a central slot 18, having substantially parallel edges 19 which are transverse to top and bottom faces 13, 14, to provide a pair of proximal prongs 21 each of which is preferably rectangular in transverse cross-section. Prongs 17 assist in holding tooth 11 in holder 12. Slot 18 extends forwardly to a forward transverse terminus 22, which is spaced forwardly of the rear end of the toot-h approximately onehalf the length of said tooth.
Forwardly of slot '18, the top and bottom distal faces 26, 27, converge forwardly to a blunt transverse cutting edge 25 which, in the initial condition of the tooth, extends straight across the entire width of the tooth (see particularly FIG. 3). Intermediate surfaces 26, 27 and prong surfaces 13, 14 are top and bottom blending surfaces 28, 29, respectively, which are curved and merge the substantially parallel top and bottom surfaces 13, 14 into the narrower converging surfaces 26, 27.
As a feature of the present invention, there is formed on both the top and bottom surfaces on either side of the tooth a longitudinally-extending upwardly-protruding rib 31, which originates at about the forward end 22 of slot 18 and has its inner edge as approximately a forward projection of wall 19 of slot 18, and has its opposite or outer edge 33 parallel to inner edge 32 at the distal end of the tooth merging in a curved surface 34 to the outside edge 16 of the tooth. It will be noted that the outside edge 33 of rib 31 is spaced inwardly from the outside 16 of the tooth a distance about equal to the width of the tooth and the ribs 31 are spaced apart about four times the width of the ribs-which is also about one-half the overall width of the distal end of the tooth.
The thickness of ribs 31 diminishes from a maximum at their originations to a minimum at end 25. The maximum thickness of each rib is about 7 and the maximum thickness between faces 13, 14, about (These dimensions being for a tooth width of two inches.)
With special attention to FIG. 2 of the accompanying drawings, it will be seen that the portions 36 on either side of the tooth, outside of ribs 31, are thinner than the contrasting portion 37 between the ribs 31, being about /s thick.
Directing attention now to FIG. 5, it will be seen that after the tooth has been used as in an auger, wear occurs. Thus in the center of the forward end of the tooth, as indicated by reference numeral 41, the leading edge curves backwardly between the ribs 31, and to either side of the ribs 31, as indicated by reference numeral 42, the sides are worn away in a diagonal line. This forms two prongs 43 at the front of the tooth which perform an efiective digging action. It will further be understood that the edge 42 is relatively shar-p by reason of the wearing away of the thin portion 36 on either side edge of the tooth.
The resultant tooth having forwardly extending prongs 43 may be used effectively and efiiciently to prolong the life of the tooth. Further, as the ribs 31 wear, the tooth may be inverted and reused.
What is claimed is:
1. A tooth formed of a unitary piece of material comprising a proximal portion formed to provide means for attachment to a cooperating tooth-holder and a distal portion, said distal portion having a thin transverse front cutting edge, thin side edges extending rearwardly of said front cutting edge and forwardly converging top and bottom faces, said faces inwardly from each said side edge being spaced apart from each other a distance substantially greater than the thickness of said side edges, said side edges being substantially of the same thickness as said front cutting edge, said top and bottom faces being formed with longitudinal ribs and at the center of said tooth said faces being spaced apart from each other a lesser distance than at said ribs.
2. A tooth according to claim 1 in which each said rib has a Width equal to about one-eighth the width of said tooth and the outer edge of said rib is spaced inwardly from the adjacent side edge of said tooth about oneeighth the width of said tooth.
3. A tooth according to claim 1 in which, spaced approximately halfway up said distal portion, the thickness of said tooth through corresponding ribs on the top and bottom surfaces is about five-thirds the thickness through the tooth intermediate said ribs.
4. A tooth according to claim 1 in which the thickness of said tooth outside said ribs is less than the thickness intermediate said ribs.
5. A tooth according to claim 1 in which said proximal portion comprises a pair of prongs each substantially rectangular in cross-section and divided by a slot extending forward from the proximal end of said tooth, the outside edges of said distal portion being substantially continuations of the parallel outside edges of said prongs.
6. A tooth according to claim 5 in which the thickness of said prongs is greater than the maximum thickness of said distal portion intermediate said ribs and approximately equal to the maximum thickness of said tooth through said ribs.
References Cited by the Examiner UNITED STATES PATENTS 1,395,048 10/1921 McKee 37--1 42 2,623,309 12/1952 Frye 37-142 2,952,085 9/1960 Petersen 413 X 3,149,679 9/1964 Johnson et al. 172-713 3,203,488 8/1965 Eastwood 37-442 X ABRAHAM G. STONE, Primary Examiner.
WILLIAM A. SMITH HI, Examiner.

Claims (1)

1. A TOOTH FORMED OF A UNITARY PIECE OF MATERIAL COMPRISING A PROXIMAL PORTION FORMED TO PROVIDE MEANS FOR ATTACHMENT TO A COOPERATING TOOTH-HOLDER AND A DISTAL PORTION, SAID DISTAL PORTION HAVING A THIN TRANSVERSE FRONT CUTTING EDGE, THIN SIDE EDGES EXTENDING REARWARDLY OF SAID FRONT CUTTING EDGE AND FORWARDLY CONVERGING TOP AND BOTTOM FACES, SAID FACES INWARDLY FROM EACH SAID SIDE EDGE BEING SPACED APART FROM EACH OTHER A DISTANCE SUBSTAN-
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Cited By (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3736676A (en) * 1972-02-10 1973-06-05 Pengo Corp Excavating tooth having outwardly slanted ribs
US4027409A (en) * 1976-07-02 1977-06-07 Caterpillar Tractor Co. Ground engaging element having a controlled cutting edge
US4037337A (en) * 1976-08-18 1977-07-26 Adco Buckets, Inc. Excavating bucket and teeth for a backhoe
US4170267A (en) * 1977-02-03 1979-10-09 Nbourlier Jacques C Tooth for rotary drilling tool for drilling foundations
US5067262A (en) * 1990-08-03 1991-11-26 Kennametal Inc. Digging tooth
US5143163A (en) * 1991-08-29 1992-09-01 Kennametal Inc. Digging tooth
WO1995029298A1 (en) * 1994-04-26 1995-11-02 Caterpillar Inc. Tooth having abrasion resistant material applied thereto
DE10022629A1 (en) * 2000-05-11 2001-11-15 Intertractor Gmbh Tooth flap for construction machines
US20040060208A1 (en) * 2002-07-01 2004-04-01 Pennsylvania Crusher Corporation Excavator teeth, apparatus and methods
US20100205835A1 (en) * 2009-02-12 2010-08-19 Bauer Maschinen Gmbh Cutting tooth for a trench wall cutter
WO2014121745A1 (en) * 2013-02-05 2014-08-14 Attachment Torque Mfg (China) Co., Ltd. Auger tooth
US10927529B2 (en) 2015-10-14 2021-02-23 Ihc Holland Ie B.V. Snail tooth
CN113994067A (en) * 2019-05-21 2022-01-28 金属工具株式会社 Spiral drill bit

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1395048A (en) * 1920-02-18 1921-10-25 American Manganese Steel Co Dipper-tooth
US2623309A (en) * 1948-06-22 1952-12-30 Robert G Frye Dipper teeth
US2952085A (en) * 1957-09-09 1960-09-13 Gerald A M Petersen Reversible tooth for earth digging equipment
US3149679A (en) * 1962-03-19 1964-09-22 Alloy Steel And Metals Company Ripper point with breakaway portion
US3203488A (en) * 1962-09-07 1965-08-31 Pacific States Steel Corp Ripper tooth

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1395048A (en) * 1920-02-18 1921-10-25 American Manganese Steel Co Dipper-tooth
US2623309A (en) * 1948-06-22 1952-12-30 Robert G Frye Dipper teeth
US2952085A (en) * 1957-09-09 1960-09-13 Gerald A M Petersen Reversible tooth for earth digging equipment
US3149679A (en) * 1962-03-19 1964-09-22 Alloy Steel And Metals Company Ripper point with breakaway portion
US3203488A (en) * 1962-09-07 1965-08-31 Pacific States Steel Corp Ripper tooth

Cited By (21)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3736676A (en) * 1972-02-10 1973-06-05 Pengo Corp Excavating tooth having outwardly slanted ribs
US4027409A (en) * 1976-07-02 1977-06-07 Caterpillar Tractor Co. Ground engaging element having a controlled cutting edge
US4037337A (en) * 1976-08-18 1977-07-26 Adco Buckets, Inc. Excavating bucket and teeth for a backhoe
US4170267A (en) * 1977-02-03 1979-10-09 Nbourlier Jacques C Tooth for rotary drilling tool for drilling foundations
US5067262A (en) * 1990-08-03 1991-11-26 Kennametal Inc. Digging tooth
US5143163A (en) * 1991-08-29 1992-09-01 Kennametal Inc. Digging tooth
WO1995029298A1 (en) * 1994-04-26 1995-11-02 Caterpillar Inc. Tooth having abrasion resistant material applied thereto
GB2292575A (en) * 1994-04-26 1996-02-28 Caterpillar Inc Tooth Having Abrasion Resistant Material Applied Thereto
US5502905A (en) * 1994-04-26 1996-04-02 Caterpillar Inc. Tooth having abrasion resistant material applied thereto
GB2292575B (en) * 1994-04-26 1997-07-23 Caterpillar Inc Tooth having abrasion resistant material applied thereto
AU680760B2 (en) * 1994-04-26 1997-08-07 Caterpillar Inc. Tooth having abrasion resistant material applied thereto
ES2128914A1 (en) * 1994-04-26 1999-05-16 Caterpillar Inc Tooth having abrasion resistant material applied thereto
DE10022629A1 (en) * 2000-05-11 2001-11-15 Intertractor Gmbh Tooth flap for construction machines
US20040060208A1 (en) * 2002-07-01 2004-04-01 Pennsylvania Crusher Corporation Excavator teeth, apparatus and methods
US20100205835A1 (en) * 2009-02-12 2010-08-19 Bauer Maschinen Gmbh Cutting tooth for a trench wall cutter
US8051588B2 (en) * 2009-02-12 2011-11-08 Bauer Maschinen Gmbh Cutting tooth for a trench wall cutter
WO2014121745A1 (en) * 2013-02-05 2014-08-14 Attachment Torque Mfg (China) Co., Ltd. Auger tooth
US10927529B2 (en) 2015-10-14 2021-02-23 Ihc Holland Ie B.V. Snail tooth
CN113994067A (en) * 2019-05-21 2022-01-28 金属工具株式会社 Spiral drill bit
US20220228445A1 (en) * 2019-05-21 2022-07-21 Metal Tool Inc. Auger bit
US11795765B2 (en) * 2019-05-21 2023-10-24 Metal Tool Inc Auger bit

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