WO1989008010A1 - An apparatus for removing teeth of a trench digging apparatus - Google Patents

An apparatus for removing teeth of a trench digging apparatus Download PDF

Info

Publication number
WO1989008010A1
WO1989008010A1 PCT/AU1989/000075 AU8900075W WO8908010A1 WO 1989008010 A1 WO1989008010 A1 WO 1989008010A1 AU 8900075 W AU8900075 W AU 8900075W WO 8908010 A1 WO8908010 A1 WO 8908010A1
Authority
WO
WIPO (PCT)
Prior art keywords
tooth
holder
trench digging
cylinder
tube
Prior art date
Application number
PCT/AU1989/000075
Other languages
French (fr)
Inventor
Ross Allan Vidler
Original Assignee
Australian Telecommunications Corporation
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
Application filed by Australian Telecommunications Corporation filed Critical Australian Telecommunications Corporation
Publication of WO1989008010A1 publication Critical patent/WO1989008010A1/en

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
    • B25B—TOOLS OR BENCH DEVICES NOT OTHERWISE PROVIDED FOR, FOR FASTENING, CONNECTING, DISENGAGING OR HOLDING
    • B25B27/00—Hand tools, specially adapted for fitting together or separating parts or objects whether or not involving some deformation, not otherwise provided for
    • B25B27/02—Hand tools, specially adapted for fitting together or separating parts or objects whether or not involving some deformation, not otherwise provided for for connecting objects by press fit or detaching same
    • B25B27/026—Hand tools, specially adapted for fitting together or separating parts or objects whether or not involving some deformation, not otherwise provided for for connecting objects by press fit or detaching same fluid driven

Definitions

  • the present invention relates to an apparatus for removing teeth of a trench digging apparatus.
  • a trench digging apparatus of the type described in the specification of the applicant's copending application entitled “A Trench Digging Apparatus” and filed concurrently with this application, comprises a plurality of cutting teeth which are used to excavate a trench.
  • the teeth are mounted on respective plates which are disposed on an endless digging chain.
  • a cutting tooth 10 mounted on one of the plates 11 is illustrated in Figure 1.
  • a tooth holder 12 is attached to the plate 11 and is adapted to receive and hold therein the tooth 10.
  • the tooth 10 is inserted into the holder 12 so that its conical cutting tip 14 remains exposed and is held within the holder 12 by a split ring (not shown) .
  • the tooth 10 engages soil to be excavated with considerable force which causes the tooth 10 to be difficult to remove upon the completion of the excavation.
  • a tooth 10 is removed, as shown in Figure 1, from the holder 12 using an appropriate steel plate 16.
  • the plate 16 has one end 18 which is bent downwards normal to the plate 16 and is adapted to engage the tooth 10 about an annular recess 20 of the tooth 10.
  • the opposite end 22 of the plate 16 is also bent downwards normal to the plate 16.
  • an object of the present invention is to provide an apparatus which overcomes, at least in part, the disadvantages associated with using the plate described above.
  • an apparatus for removing teeth of a trench digging apparatus comprising means for engaging a tooth disposed in a holder, means for engaging said holder, and means for moving said tooth engaging means with respect to said holder engaging means and away from said holder.
  • said tooth engaging means is disposed within said holder engaging means.
  • said moving means comprises a hyraulic cylinder.
  • the piston of the cylinder is coupled to the tooth engaging means.
  • the holder engaging means comprises a tube.
  • the tube is affixed to the cylinder.
  • the tooth engaging means comprises jaws adapted to engage an annular recess of the tooth.
  • Figure 1 is a side viewof a previously known apparatus for removing teeth attached to a tooth in a holder
  • Figure 2 is a partial cross-sectional view of an apparatus according to the present invention attached to a tooth in a holder;
  • Figure 3 is a cross-sectional view A-A of the apparatus of Figure 2 as attached to a tooth.
  • An apparatus 30 for removing teeth of a trench digging apparatus comprises a hydraulic cylinder 32, a tube, or barrel, 34 and a tooyh engaging part 36.
  • the tooth engaging part 36 includes a plurality of jaws 38 which are adapted to fit over the conical end 40 of the tooth 10 and engage the annular recess 20 of the tooth 10.
  • the ends 42 of the jaws 38 are resiliently biased, to a limited extent, in towards one another and include inward protrusions 44 which snap-fit within the recess 20 once the ends 42 have been forced over the conical end 40 of the tooth 10.
  • the jaws 38 are joined at a base portion 46 of the tooth engaging part 36 and this base portion 46 is affixed to the piston 48 of the cylinder 32.
  • the tube 34 is attached to the cylinder 32, by means of an O-ring 50 and is configured so that the piston and the tooth engaging part 36 are able to move within the tube 34.
  • the end 52 of the tube 34 opposite the cylinder 32, is adapted to engage the holder 12 when the jaws 38 of the tooth engaging part 36 engage the tooth 10.
  • the end 52 of the tube 34 abuts the surface 54 of the holder 12 into which the tooth 10 is inserted.
  • the tooth engaging part 36 is held in position within the tube 34 by means of an O-ring 56 disposed within the base 46 and an O-ring 58 disposed in the ends 42 of the jaws 38.
  • the O-ring 58 is used to resiliently bias the ends 42 so that when they are passed over the conical portion 40 of the tooth 10 the protrusions 44 fit within the recess 20 of the tooth 10.
  • the tooth 10 may be removed from the holder by activating the cylinder 32 so as to drive the piston 48 away from the holder 12 in the direction of the arrow 60.
  • the piston 48 is fully retracted in the cylinder 32 the tooth 10 is no longer disposed in the holder 12 and is held by the tooth engaging part 36.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Earth Drilling (AREA)

Abstract

An apparatus (30) for removing teeth (10) which are each disposed in a holder (12) of a trench digging apparatus comprises a tooth engaging part (36), a tube (34) which engages a respective holder (12), and a hydraulic arrangement whose cylinder (32) bears on the tube (34). The hydraulic arrangement acts by means of a piston (48) associated with the cylinder (32) to move the tooth engaging part (36) away from the holder (12), thus removing the tooth (10) from the holder (12).

Description

"AN APPARATUS FOR REMOVING TEETH OF A TRENCH DIGGING APPARATUS"
The present invention relates to an apparatus for removing teeth of a trench digging apparatus.
A trench digging apparatus, of the type described in the specification of the applicant's copending application entitled "A Trench Digging Apparatus" and filed concurrently with this application, comprises a plurality of cutting teeth which are used to excavate a trench. The teeth are mounted on respective plates which are disposed on an endless digging chain. A cutting tooth 10 mounted on one of the plates 11 is illustrated in Figure 1. A tooth holder 12 is attached to the plate 11 and is adapted to receive and hold therein the tooth 10. The tooth 10 is inserted into the holder 12 so that its conical cutting tip 14 remains exposed and is held within the holder 12 by a split ring (not shown) . During an excavation operation the tooth 10 engages soil to be excavated with considerable force which causes the tooth 10 to be difficult to remove upon the completion of the excavation.
Normally a tooth 10 is removed, as shown in Figure 1, from the holder 12 using an appropriate steel plate 16. The plate 16 has one end 18 which is bent downwards normal to the plate 16 and is adapted to engage the tooth 10 about an annular recess 20 of the tooth 10. The opposite end 22 of the plate 16 is also bent downwards normal to the plate 16. Once positioned on the tooth 10, as shown in Figure 1, the plate 16 is used to remove the tooth 10 by striking a surface of the opposite end 22 so as to cause the first end 18 to pull the tooth 10 from the holder 12. This, however, is a cumbersome, time-consuming and labour intensive method of removing the tooth 10 from the holder 12.
Accordingly, an object of the present invention is to provide an apparatus which overcomes, at least in part, the disadvantages associated with using the plate described above.
In accordance with the present invention there is provided an apparatus for removing teeth of a trench digging apparatus, comprising means for engaging a tooth disposed in a holder, means for engaging said holder, and means for moving said tooth engaging means with respect to said holder engaging means and away from said holder. Preferably said tooth engaging means is disposed within said holder engaging means.
Preferably said moving means comprises a hyraulic cylinder. Preferably the piston of the cylinder is coupled to the tooth engaging means.
Preferably the holder engaging means comprises a tube. Preferably the tube is affixed to the cylinder.
Preferably the tooth engaging means comprises jaws adapted to engage an annular recess of the tooth.
A preferred embodiment of the present invention will now be described, by way of example only, with reference to the accompanying drawings wherein:
Figure 1 is a side viewof a previously known apparatus for removing teeth attached to a tooth in a holder;
Figure 2 is a partial cross-sectional view of an apparatus according to the present invention attached to a tooth in a holder; and
Figure 3 is a cross-sectional view A-A of the apparatus of Figure 2 as attached to a tooth.
An apparatus 30 for removing teeth of a trench digging apparatus, as shown in Figures 2 and 3, comprises a hydraulic cylinder 32, a tube, or barrel, 34 and a tooyh engaging part 36. The tooth engaging part 36 includes a plurality of jaws 38 which are adapted to fit over the conical end 40 of the tooth 10 and engage the annular recess 20 of the tooth 10. The ends 42 of the jaws 38 are resiliently biased, to a limited extent, in towards one another and include inward protrusions 44 which snap-fit within the recess 20 once the ends 42 have been forced over the conical end 40 of the tooth 10. The jaws 38 are joined at a base portion 46 of the tooth engaging part 36 and this base portion 46 is affixed to the piston 48 of the cylinder 32.
The tube 34 is attached to the cylinder 32, by means of an O-ring 50 and is configured so that the piston and the tooth engaging part 36 are able to move within the tube 34. The end 52 of the tube 34, opposite the cylinder 32, is adapted to engage the holder 12 when the jaws 38 of the tooth engaging part 36 engage the tooth 10. The end 52 of the tube 34 abuts the surface 54 of the holder 12 into which the tooth 10 is inserted.
The tooth engaging part 36 is held in position within the tube 34 by means of an O-ring 56 disposed within the base 46 and an O-ring 58 disposed in the ends 42 of the jaws 38. The O-ring 58 is used to resiliently bias the ends 42 so that when they are passed over the conical portion 40 of the tooth 10 the protrusions 44 fit within the recess 20 of the tooth 10.
Once the apparatus 30 has been used to engage the tooth 10 and abut the holder 12, as shown in Figure 2, the tooth 10 may be removed from the holder by activating the cylinder 32 so as to drive the piston 48 away from the holder 12 in the direction of the arrow 60. When the piston 48 is fully retracted in the cylinder 32 the tooth 10 is no longer disposed in the holder 12 and is held by the tooth engaging part 36.
Many modifications will be apparent to those skilled in the art without departing from the scope of the present invention as hereinbefore described with reference to the accompanying drawings.

Claims

1. An apparatus for removing teeth of a trench digging apparatus, comprising means (36) for engaging a tooth (10) disposed in a holder (12), means (34) for engaging said holder (12), and means for moving said tooth engaging means (36) with respect to said holder engaging means (34) and away from said holder (12).
2. An apparatus according to claim 1 wherein said tooth engaging means (36) is disposed within said holder engaging means (34).
3. An apparatus according to either preceding claim wherein said moving means comprises a hydraulic cylinder (32, 48).
4. An apparatus according to claim 3 wherein the piston (48) of the cylinder is coupled to the tooth engaging means (36).
5. An apparatus according to any preceding claim wherein the holder engaging means (34) comprises a tube.
6. An apparatus according to claims 3 and 5 wherein said tube (34) is affixed to the cylinder (32, 48).
7. An apparatus according to any preceding claim wherein the tooth engaging means (36) comprises jaws adapted to engage an annular recess of the tooth (10).
8. An apparatus for removing teeth of a trench digging apparatus, substantially as hereinbefore described with reference to either of Figures 2 or 3 of the accompanying drawings.
PCT/AU1989/000075 1988-02-26 1989-02-27 An apparatus for removing teeth of a trench digging apparatus WO1989008010A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
AUPI6982 1988-02-26
AUPI698288 1988-02-26

Publications (1)

Publication Number Publication Date
WO1989008010A1 true WO1989008010A1 (en) 1989-09-08

Family

ID=3772865

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/AU1989/000075 WO1989008010A1 (en) 1988-02-26 1989-02-27 An apparatus for removing teeth of a trench digging apparatus

Country Status (3)

Country Link
CA (1) CA1326126C (en)
WO (1) WO1989008010A1 (en)
ZA (1) ZA891444B (en)

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1078959B (en) * 1958-04-24 1960-03-31 Johann Mueller Device for pulling a gear shaft located in a gear housing from at least one gear
US3579796A (en) * 1969-08-19 1971-05-25 Walter A Fillion Puller device for generally cylindrical stem assemblies or valves
SU549309A1 (en) * 1975-12-26 1977-03-05 Краснодарский Филиал Центрального Опытно-Конструкторского И Технологического Бюро Государственного Всесоюзного Ордена Трудового Красного Знамени Научно-Исследовательского Технологического Института Ремонта И Эксплуатации Машинно-Тракторного Парка Parts Remover
SU795932A1 (en) * 1979-03-11 1981-01-15 Центральное Опытно-Конструкторскоеи Технологическое Бюро Государствен-Ного Всесоюзного Ордена Трудовогокрасного Знамени Научно-Исследовательс-Кого Технологического Институтаремонта И Эксплуатации Машинно-Тракторного Парка,Сибирский Филиал Stripper
SU1293008A1 (en) * 1985-01-07 1987-02-28 Центральное Опытное Проектно-Конструкторское И Технологическое Бюро Госнити По Организации И Технологии Ремонта И Технического Обслуживания Автомобилей Puller
SU1298065A1 (en) * 1985-10-28 1987-03-23 Предприятие П/Я Р-6886 Puller for dismantling radioelectronic boards

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1078959B (en) * 1958-04-24 1960-03-31 Johann Mueller Device for pulling a gear shaft located in a gear housing from at least one gear
US3579796A (en) * 1969-08-19 1971-05-25 Walter A Fillion Puller device for generally cylindrical stem assemblies or valves
SU549309A1 (en) * 1975-12-26 1977-03-05 Краснодарский Филиал Центрального Опытно-Конструкторского И Технологического Бюро Государственного Всесоюзного Ордена Трудового Красного Знамени Научно-Исследовательского Технологического Института Ремонта И Эксплуатации Машинно-Тракторного Парка Parts Remover
SU795932A1 (en) * 1979-03-11 1981-01-15 Центральное Опытно-Конструкторскоеи Технологическое Бюро Государствен-Ного Всесоюзного Ордена Трудовогокрасного Знамени Научно-Исследовательс-Кого Технологического Институтаремонта И Эксплуатации Машинно-Тракторного Парка,Сибирский Филиал Stripper
SU1293008A1 (en) * 1985-01-07 1987-02-28 Центральное Опытное Проектно-Конструкторское И Технологическое Бюро Госнити По Организации И Технологии Ремонта И Технического Обслуживания Автомобилей Puller
SU1298065A1 (en) * 1985-10-28 1987-03-23 Предприятие П/Я Р-6886 Puller for dismantling radioelectronic boards

Non-Patent Citations (4)

* Cited by examiner, † Cited by third party
Title
DERWENT ABSTRACT ACCESSION NO. 87-297275/42, Class P62; & SU,A, 1298065 (FOMICHEV), 23 March 1987 (23.03.87). *
DERWENT ABSTRACT ACCESSION NO. 87-319351/45, Class P62; & SU,A, 1293008 (CAR TECH AID GOSNIT), 29 February 1987 (29.02.87). *
DERWENT ABSTRACT ACCESSION NO. J7634Y/43, Class P56, P62; & SU,A, 549309 (KRASD MACH TRACTOR), 14 April 1977 (14.04.77). *
DERWENT ABSTRACT ACCESSION NO. K3606D/40, Class P62; & SU,A, 795932 (SIDE MACH TRACTOR), 17 January 1981 (17.01.81). *

Also Published As

Publication number Publication date
ZA891444B (en) 1992-06-24
CA1326126C (en) 1994-01-18

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