EP0412186B1 - Baggerzahn - Google Patents

Baggerzahn Download PDF

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Publication number
EP0412186B1
EP0412186B1 EP89114753A EP89114753A EP0412186B1 EP 0412186 B1 EP0412186 B1 EP 0412186B1 EP 89114753 A EP89114753 A EP 89114753A EP 89114753 A EP89114753 A EP 89114753A EP 0412186 B1 EP0412186 B1 EP 0412186B1
Authority
EP
European Patent Office
Prior art keywords
lugs
nose
locking pin
point
wall
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
EP89114753A
Other languages
English (en)
French (fr)
Other versions
EP0412186A1 (de
Inventor
Robert K. Emrich
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Esco Corp
Original Assignee
Esco Corp
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Family has litigation
First worldwide family litigation filed litigation Critical https://patents.darts-ip.com/?family=26120453&utm_source=google_patent&utm_medium=platform_link&utm_campaign=public_patent_search&patent=EP0412186(B1) "Global patent litigation dataset” by Darts-ip is licensed under a Creative Commons Attribution 4.0 International License.
Priority to AU38874/89A priority Critical patent/AU605431B1/en
Priority to ES89114753T priority patent/ES2070874T3/es
Priority to AT89114753T priority patent/ATE119604T1/de
Priority to DE68921621T priority patent/DE68921621T2/de
Priority to EP89114753A priority patent/EP0412186B1/de
Application filed by Esco Corp filed Critical Esco Corp
Publication of EP0412186A1 publication Critical patent/EP0412186A1/de
Publication of EP0412186B1 publication Critical patent/EP0412186B1/de
Application granted granted Critical
Priority to GR940403517T priority patent/GR3015337T3/el
Priority to HK98104778A priority patent/HK1005601A1/xx
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • 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
    • E02F9/2816—Mountings therefor
    • E02F9/2833—Retaining means, e.g. pins
    • E02F9/2841—Retaining means, e.g. pins resilient
    • 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
    • E02F9/2816—Mountings therefor
    • E02F9/2825—Mountings therefor using adapters

Definitions

  • This invention relates to an excavating tooth and more particularly to a replacement point therefor, being an improvement on the arrangement disclosed in European Patent document EP-A-0 270 325 which in turn is an improvement on the arrangement of document US-A-4335,532.
  • European Patent document EP-A-0 270 325 discloses a replacement point for an excavating tooth for mounting on excavating equipment comprising a relatively elongated, unitary body having an earth engaging edge at the forward end thereof and an adapter nose-receiving socket in the rear end defined by top, bottom and a pair of side walls, at least one of said side walls extending rearwardly beyond said top and bottom walls, to provide an ear.
  • the ear has an inwardly facing lug which together with a pair of vertically spaced lugs on the adapter cooperate to retain a locking pin, which holds the point on the adapter.
  • the pair of vertically spaced lugs are provided on the point.
  • the adapter that cooperates with this point carries the single lug. In operation a pivotal movement of the point with respect to the adapter causes a rocking of the pin on the ears as opposed to the rubbing movement which occurs in the arrangement of document EP-A-0 270 325.
  • the arrangement of the invention further reduces bearing pressures of the point on the nose by providing a longer bearing surface, thereby slowing the rate of nose wear and resultant loosening of point fits.
  • the rearwardly extending side wall ear so extends between the vertically spaced upper and lower ear lugs as to protect the locking pin and pin bearing surface of the adapter from soil and rock during excavating.
  • the use of spaced-apart ear lugs on the point also has the additional advantage of permitting elimination of projecting ears on the nose.
  • projecting ears can be a source of stress concentration. Hence their elimination provides greater nose fatigue strength.
  • the HELILOK® tooth of the '532 is pictured. This consists of a point A, an adapter having a nose portion B, and a U-shaped lock C. This tooth construction was especially advantageous in providing a stronger nose because of the absence of any locking pin opening.
  • the invention is based on the discovery that the pin normally moves with the point when the latter is under impact loading. This can be appreciated from the diagrammatic showing in FIG. 7. There, the adapter nose is show in solid line and is designated 20. The locking pin is also shown in solid line and is designated 21 in the non-impact condition. The tooth point, however, is show in dashed line, designated 22 and also is in the non-impact or static condition.
  • the pin likewise pivots to the dotted line position designated 21′.
  • FIG. 3 the sidewalls of the point A′ are extended rearwardly beyond the socket 27 to provide ears 25 and 26.
  • these ear portions or means are equipped with integral lugs 28, 29 for the ear 25 and 30, 31 for ear 26.
  • the lug 29 can be seen in the lower right-hand portion of FIG. 4 and the lug 31 is seen in the upper right-hand portion of that view. All of these lugs are also designated in FIG. 6.
  • These lugs are inwardly projecting and by that I refer to extending at approximately a right angle to the length of the socket 27, i.e., the interior of the tooth.
  • the vertical distance between the top 33 of the upper lug 31 and the bottom 32 of the lower lug 30 is approximately the length of the rear diameter of the socket 27 which has a circular cross-section at its rear end, i.e., in the "nose cone" surface at E in FIGS. 1-3.
  • This relationship is advantageous in that it permits adequate size of the integral lugs from the standpoints of structural strength and bearing area.
  • the inward surfaces 34 and 35 of the lugs 30 and 31 as seen in FIG. 6 are partly bevelled surfaces located for minimum clearance around the nose cone surface E in FIG. 3. This can be seen most clearly in FIG. 6, where the surfaces E′ are extensions of the nose cone rearward to the region of FIG. 6.
  • these inward, beveled surfaces of the lugs must clear the nose cone and extension surfaces, E and E′.
  • the inward beveled surfaces 34, 35 of the ear lugs actually are arcuate, but satisfactory function could be achieved with straight bevels.
  • the pair of forwardly facing lug walls 36 and 37 together are portions of an arcuate surface for tightening engagement with longitudinally spaced areas of the concave rear edge 38 of the pin 21. Only one pair of lugs engage the pin on any given assembly, the other pair being for the purpose of allowing installation of the point in 180° turned orientation. This practice of turning points when they are about half worn out is sometimes practiced when a very sharp digging configuration is required.
  • the radius of the concave rear edge 38 of the pin 21 is smaller than the radius of the arc surface pairs 36, 37 or those corresponding pairs on lugs 28 and 29. Therefore, if the pin 21 is placed in contact with the lug 21 arc surface 36, 37, but not in assembly on a nose, the contact is locally near the ends of the lug surfaces as at 32 and 33. With assembly of the pin into a point and nose assembly, this contact of the pin on the lug arc surfaces becomes more distributed because the pin is caused to flex through the contact of its forward convex edge 39 with the forward wall 24 of the nose groove 40 -- see FIGS. 5, 8 and 10. Finally, under operating loads received on the point during service, the pin is able to flex still more so that the radius of its concave rear edge 38 essentially matches that of lug arc surfaces 36, 37 for full surface contact.
  • I employ the forward wall 24 of the nose groove 40 -- see FIGS. 4 and 5.
  • the nose bearing surface is planar as at 24 in FIG. 8 or slightly arcuate as at 124 in FIG. 9 relative to the groove 140. Nominally, the pin bears on the nose surfaces at 24, 124 near the longitudinal mid-plane of the nose, but during impact stress the bearing shifts above and below the mid-plane.
  • the groove 40 in the nose is defined insofar as its rear wall is concerned by an integral ledge 43 -- compare FIGS. 3 and 4.
  • This ledge merges top and bottom into the nose as can be appreciated from the showings at 44 and 45 in FIGS. 3 and 8 and at 144 and 145 in FIG. 9 relative to the ledge 143.
  • the arcuity of the forward wall 124 of FIG. 9 can be appreciated from the fact that at its mid point, it is tangent to the keeper opening 146 -- as contrasted to the relationship of the wall 24 to the keeper opening 46 in FIG. 8. There, the wall 24 has a groove 47 to accommodate insertion of the keeper -- see also FIG. 10.
  • the ledge 43 (or 143) also serves as a guide during locking pin installation.
  • the construction of the lugs 28 and 29 is identical to that of FIG. 3 -- only the ear means providing the lug portions 30, 31 being omitted.
  • the pin C ⁇ differs from the pin C′ (compare FIGS. 2 and 3) in that the pin used with the inventive point has a forward curvature, i.e., is normally bowed. This facilitates the desired rocking action that minimizes nose wear at the area 24.
  • FIG. 12 An alternative construction of locking pin 221 is shown in FIG. 12.
  • the point ears of this construction again are of approximately the same length as the rear diameter of the point socket 27, but the forwardly facing lug walls 236 and 237 are not arcuate Rather these lug walls are flat and parallel for use with a sandwich type pin.
  • This sandwich pin as has been used for many years in the industry, is a laminate of steel plates 248, 250 confining a rubber core 249. This construction does not offer the advantage of rocking engagement with the nose lock groove wall 224 but it would be suitable for light duty applications, and as such, would provide the advantage of operating without a plug D.
  • the pin's retention in assembly is provided by the engagement of the rearward projection 251 on the rear steel laminate 248 with the inward edges 236, 237 of the lugs 228 and 229.
  • corresponding lugs are normally provided on the opposite sides of the point, as is a corresponding groove on the nose.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mining & Mineral Resources (AREA)
  • Civil Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Structural Engineering (AREA)
  • Component Parts Of Construction Machinery (AREA)
  • Steroid Compounds (AREA)
  • Gears, Cams (AREA)
  • Dental Preparations (AREA)

Claims (10)

  1. Auswechselspitze für einen Baggerzahn zur Befestigung an einer Baggerausrüstung, mit einem verhältnismäßig langgestreckten unitären Körper (A'), der an seinem vorderen Ende eine Erdeingriffskante aufweist und der an dem hinteren Ende, das durch eine Oberseite, eine Unterseite und ein Seitenwandpaar begrenzt ist, eine Anschlußmuffe (27) zur Nasenaufnahme aufweist, wobei sich mindestens eine der Seitenwände nach hinten über die Ober- und Unterseiten hinaus erstreckt, um ein Ohr vorzusehen, dadurch gekennzeichnet, daß dieses sich nach hinten erstreckende Seitenwandohr (25) in der Nachbarschaft dessen Ober- und Unterseite vertikal mit Abstand angeordnete obere und untere Ohransätze (29, 28; 229, 228) aufweist, die so ausgerichtet sind, daß sie an einem Sperrbolzen (21, 221) lagern, wobei sich jeder Ohransatz nur einwärts von der Seitenwand (25) ungefähr in einem rechten Winkel zu der Seitenwand (25) erstreckt, um an einem Sperrbolzen (21, 221) zu lagern, wobei sich die Ansätze (29, 28; 229, 228) ganz hinten an der Seitenwand (25) befinden, wobei die Rückseiten der Ansätze (29, 28; 229, 228) die hinterste Ausdehnung der genannten einen Seitenwand (25) bilden.
  2. Spitze nach Anspruch 1, ferner dadurch gekennzeichnet, daß sich das nach hinten erstreckende Seitenwandohr (25) so zwischen den vertikal mit Abstand angeordneten oberen und unteren Ohransätzen (29, 28; 229, 228) erstreckt, daß der Sperrbolzen während dem Baggern vor Erde und Steinen geschützt wird.
  3. Spitze nach Anspruch 1 oder 2, wobei das obere Teilstück des oberen Ansatzes ungefähr mit der Oberseite ausgerichtet ist, und wobei das untere Teilstück des unteren Ansatzes ungefähr mit der Unterseite ausgerichtet ist.
  4. Spitze nach Anspruch 1, 2 oder 3, wobei die Muffe (27) einen allgemein kreisförmigen Querschnitt aufweist, und wobei die Ansätze (29, 28; 229, 228) jeweils eine nach innen gerichtete Wand aufweisen, die in deren zueinander benachbarten Teilstücken abgeschrägt sind, so daß sie mit der Form der Muffe zusammenpassen.
  5. Spitze nach einem der vorstehenden Ansprüche, wobei die Ansätze (29, 28; 229, 228) jeweils eine vorwärts ausgerichtete Wand aufweisen, wobei das Teilstück der vorwärts gerichteten Wand des unteren Ansatzes, das sich in Nachbarschaft zu dem oberen Ansatz befindet, nach hinten abgeschrägt ist, um den Sperrbolzen bei dessen Installation zu führen.
  6. Spitze nach einem der vorstehenden Ansprüche, wobei sich beide Seitenwände über die Ober- und Unterseiten hinaus erstrecken, wobei jede Seitenwand mit den Ansätzen (29, 28; 229, 228) versehen ist.
  7. Spitze nach einem der vorstehenden Ansprüche, wobei die Ansätze (29, 28) jeweils eine nach vorne zeigende, gebogene Wand aufweisen.
  8. Spitze nach einem der Ansprüche 1 bis 6, wobei die Ansätze jeweils eine nach vorne zeigende, ebene Wand aufweisen.
  9. Zusammenbau mit einer Spitze gemäß einem der vorstehenden Ansprüche, mit einem mit einer Nase versehenen Anschlußstück (B''), wobei die Nase mit einer sich vertikal erstreckenden Rille (40) zur Aufnahme eines Sperrbolzens versehen ist, und einem vertikal verhältnismäßig langgestreckten Sperrbolzen (C'') in der Rille (40), wobei die Rille eine Vorderwand (24, 124, 224) aufweist, die lagernd mit einem Zwischenstück des Sperrbolzens (C'') eingreift, und wobei die Ohransätze (29, 28; 229, 228) der Spitze neben den Enden des Sperrbolzens (C'') lagernd mit dem Sperrbolzen eingreifen.
  10. Zusammenbau nach Anspruch 9, wobei das Anschlußstück mit einer sich horizontal erstreckenden Vertiefung (46) versehen ist, die mit dem Sperrbolzen (C'') ausgerichtet ist, und mit einer elastischen Schließeinrichtung für den Sperrbolzen (C'') in der Vertiefung (46), wobei sich die Vertiefung (46) von der Rille einwärts erstreckt.
EP89114753A 1989-08-09 1989-08-09 Baggerzahn Expired - Lifetime EP0412186B1 (de)

Priority Applications (7)

Application Number Priority Date Filing Date Title
AU38874/89A AU605431B1 (en) 1989-08-09 1989-07-24 Excavating tooth
AT89114753T ATE119604T1 (de) 1989-08-09 1989-08-09 Baggerzahn.
DE68921621T DE68921621T2 (de) 1989-08-09 1989-08-09 Baggerzahn.
EP89114753A EP0412186B1 (de) 1989-08-09 1989-08-09 Baggerzahn
ES89114753T ES2070874T3 (es) 1989-08-09 1989-08-09 Diente excavador.
GR940403517T GR3015337T3 (en) 1989-08-09 1995-03-09 Excavating tooth.
HK98104778A HK1005601A1 (en) 1989-08-09 1998-06-03 Excavating tooth

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
EP89114753A EP0412186B1 (de) 1989-08-09 1989-08-09 Baggerzahn
HK98104778A HK1005601A1 (en) 1989-08-09 1998-06-03 Excavating tooth

Publications (2)

Publication Number Publication Date
EP0412186A1 EP0412186A1 (de) 1991-02-13
EP0412186B1 true EP0412186B1 (de) 1995-03-08

Family

ID=26120453

Family Applications (1)

Application Number Title Priority Date Filing Date
EP89114753A Expired - Lifetime EP0412186B1 (de) 1989-08-09 1989-08-09 Baggerzahn

Country Status (7)

Country Link
EP (1) EP0412186B1 (de)
AT (1) ATE119604T1 (de)
AU (1) AU605431B1 (de)
DE (1) DE68921621T2 (de)
ES (1) ES2070874T3 (de)
GR (1) GR3015337T3 (de)
HK (1) HK1005601A1 (de)

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2162474A1 (de) * 1971-12-16 1973-06-20 Andre Aulfinger Baggerzahn mit auswechselbarer zahnspitze
DE7304417U (de) * 1972-03-08 1973-05-17 Aktiebolaget Bofors Löffelzahn für Baggerlöffel od. dgl
SE456097B (sv) * 1984-04-18 1988-09-05 Bofors Wear Parts Ab Slitdel till verktyg till markbearbetningsmaskiner
US4761900A (en) * 1986-12-04 1988-08-09 Esco Corporation Excavating tooth assembly

Also Published As

Publication number Publication date
EP0412186A1 (de) 1991-02-13
DE68921621T2 (de) 1995-10-05
AU605431B1 (en) 1991-01-10
ATE119604T1 (de) 1995-03-15
DE68921621D1 (de) 1995-04-13
HK1005601A1 (en) 1999-01-15
ES2070874T3 (es) 1995-06-16
GR3015337T3 (en) 1995-06-30

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