EP0412186A1 - Baggerzahn - Google Patents

Baggerzahn Download PDF

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Publication number
EP0412186A1
EP0412186A1 EP89114753A EP89114753A EP0412186A1 EP 0412186 A1 EP0412186 A1 EP 0412186A1 EP 89114753 A EP89114753 A EP 89114753A EP 89114753 A EP89114753 A EP 89114753A EP 0412186 A1 EP0412186 A1 EP 0412186A1
Authority
EP
European Patent Office
Prior art keywords
point
nose
locking pin
lugs
pin
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.)
Granted
Application number
EP89114753A
Other languages
English (en)
French (fr)
Other versions
EP0412186B1 (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(A1) "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 novel point portion thereof, being an improvement on Patent 4,761,900 which, in turn, was an improvement on co-owned Patent 4,353,532.
  • a novel locking system was provided to replace the U-shaped fastener employed in the HELILOK tooth sold throughout the world -- see '532 patent
  • the '900 system employed a drive through pin maintained in place by a plug member or keeper which extended transversely of the adapter length, i.e., horizontally so as to be unstressed by impact loads.
  • the vertical locking pin in the '900 patent was clamped in place by an ear lug on the point rear cooperating with a pair of vertically spaced ears on the adapters. These cooperated to retain the pin which was generally arched rearwardly, i.e., the convex side faced rearwardly.
  • the inventive construction 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. Also, it provides for a "rocking" type bearing of the point retaining pin against the nose to reduce wear of the pin bearing surface on the nose. Whereas the '900 pin is caused to rub against the nose ears through small movements up and down that are induced by the point under loading, the spaced ear lugs of the inventive point permit a pin configuration that can absorb the point induced movement through locking. This rocking movement equates to a slower rate of wear on the pin bearing surface of the nose in comparison to the '900 construction, as with the simple analogy of the rolling wheel versus the sliding block. Further the inventive construction provides that the rear sidewalls of the point completely protect the nose pin bearing surface and the pin itself from all external wear, that is, wear from abrasive soil and rock which the tooth system is excavating.
  • 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)
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 true EP0412186A1 (de) 1991-02-13
EP0412186B1 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)

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2053156A1 (de) * 1970-10-29 1972-05-04 Schwarzkopf, Karl, 3265 Rehren Stiftvernegelung, insbesondere zur Verriegelung auswechselbarer Zahnspitzen von Baggerzahnen
DE2162474A1 (de) * 1971-12-16 1973-06-20 Andre Aulfinger Baggerzahn mit auswechselbarer zahnspitze
FR2175120A1 (de) * 1972-03-08 1973-10-19 Bofors Ab
GB2157650A (en) * 1984-04-18 1985-10-30 Bofors Wear Parts Ab Wear part for earth working tooth
EP0270325A1 (de) * 1986-12-04 1988-06-08 Esco Corporation Baggerzahnanordnung

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2053156A1 (de) * 1970-10-29 1972-05-04 Schwarzkopf, Karl, 3265 Rehren Stiftvernegelung, insbesondere zur Verriegelung auswechselbarer Zahnspitzen von Baggerzahnen
DE2162474A1 (de) * 1971-12-16 1973-06-20 Andre Aulfinger Baggerzahn mit auswechselbarer zahnspitze
FR2175120A1 (de) * 1972-03-08 1973-10-19 Bofors Ab
GB2157650A (en) * 1984-04-18 1985-10-30 Bofors Wear Parts Ab Wear part for earth working tooth
EP0270325A1 (de) * 1986-12-04 1988-06-08 Esco Corporation Baggerzahnanordnung

Also Published As

Publication number Publication date
GR3015337T3 (en) 1995-06-30
HK1005601A1 (en) 1999-01-15
ES2070874T3 (es) 1995-06-16
ATE119604T1 (de) 1995-03-15
DE68921621T2 (de) 1995-10-05
EP0412186B1 (de) 1995-03-08
AU605431B1 (en) 1991-01-10
DE68921621D1 (de) 1995-04-13

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