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GB1597554A - Cutter for a building machine - Google Patents

Cutter for a building machine Download PDF

Info

Publication number
GB1597554A
GB1597554A GB10083/78A GB1008378A GB1597554A GB 1597554 A GB1597554 A GB 1597554A GB 10083/78 A GB10083/78 A GB 10083/78A GB 1008378 A GB1008378 A GB 1008378A GB 1597554 A GB1597554 A GB 1597554A
Authority
GB
United Kingdom
Prior art keywords
tooth
nose
tooth tip
cutter
cutter blade
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
Application number
GB10083/78A
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.)
INTERTRAC VIEHMANN AND Co
Intertractor Viehmann GmbH and Co
Original Assignee
INTERTRAC VIEHMANN AND Co
Intertractor Viehmann GmbH and Co
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 INTERTRAC VIEHMANN AND Co, Intertractor Viehmann GmbH and Co filed Critical INTERTRAC VIEHMANN AND Co
Publication of GB1597554A publication Critical patent/GB1597554A/en
Expired legal-status Critical Current

Links

Classifications

    • EFIXED CONSTRUCTIONS
    • E02HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02FDREDGING; SOIL-SHIFTING
    • E02F9/00Component parts of dredgers or soil-shifting machines, not restricted to one of the kinds covered by groups E02F3/00 - E02F7/00
    • E02F9/28Small metalwork for digging elements, e.g. teeth scraper bits
    • E02F9/2808Teeth
    • E02F9/2816Mountings therefor
    • E02F9/2825Mountings therefor using adapters

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)
  • Excavating Of Shafts Or Tunnels (AREA)
  • Shovels (AREA)
  • Organic Insulating Materials (AREA)
  • Telephone Function (AREA)
  • Diaphragms For Electromechanical Transducers (AREA)
  • Harvester Elements (AREA)

Abstract

A bucket tooth is fastened to the bucket blade (1) of the bucket of a construction machine. The tooth body (2) carrying an interchangeable tooth tip (3) engages with a wedge-shaped nose (5) in a corresponding recess (6) of the tooth tip (3). The tooth tip (3) is fastened to the nose (5) of the tooth body (2) by means of a pin (4) which passes through apertures (7, 8) in the tooth tip (3) and in the nose (5) and presses the tooth tip (3) onto the nose (5) of the tooth body (2). In addition, the tooth body (2) is supported with a shoulder (9) on the front of the bucket blade (1). The tooth body (2) has a double-T-shaped cross-section starting at the shoulder (9) supported on the bucket blade (1) in the direction of the end part remote from the nose (5). It is arranged with the flange margins (11) of the tooth-body part on the bucket blade (1) in such a way that, on the one hand, the web (10) of the I-shaped tooth-body part runs approximately plane-parallel to the bearing side of the bucket blade (1) and, on the other hand, the lines of action of the longitudinal forces effective on the tooth-body part from the tooth tip (3) via the nose (5) intersect the centre plane of the web (10) close to the shoulder (9). <IMAGE>

Description

(54) CUTTER FOR A BUILDING MACHINE (71) We, INTERTRAC VIEHMANN & BR< Co., an offene Handelgesellschaft, of Hagener Strasse 325, 5820 Gevelsberg, Germany, do hereby declare the invention, for which we pray that a patent may be granted to us, and the method by which it is to be performed, to be particularly described in and by the following statement:- The invention relates to a cutter for a building machine, such as an excavator, the cutter being of the kind comprising a cutter blade on which is mounted a tooth body, having mounted thereon a replaceable tip.
The tooth body is provided with a wedgeshaped nose which fits into a recess provided in the tooth tip and adapted to the wedge shape of the nose, and the tooth tip is fastened on the nose of the tooth body by means of a pin which passes through apertures in the tip and in the nose and presses the tooth tip onto the nose of the tooth body; in addition, the tooth body is supported by a downwardly depending shoulder against the front of the cutter blade.
In a cutter of the kind described above, which is known from DT-OS 2605211, the portion of the tooth body which serves to fasten it to the cutter blade is in the form of a U-shaped hollow bowl, the sides of which extend along the tooth body and are fastened at their free edges to the cutter blade, the connection usually being made by welding.
It is an object of the present invention to make it possible to transmit considerably greater forces than hitherto from the tooth tip to the cutter blade without additional expense for extra material.
According to the invention there is provided a cutter for a building machine comprising a cutter blade including a forward edge and a bearing face, and a tooth mounted on the cutter blade, the tooth comprising a tooth body provided with a substantially wedge-shaped hose at one of its ends, a tooth tip mounted on the tooth body and formed with a recess of complementary shape to that of the nose, and a pin which passes through apertures in the tooth body and the tooth tip to fasten and press the tooth tip onto the nose received within the recess, the tooth body comprising a downwardly depending shoulder supported on the forward edge of the cutter blade and a portion having in transverse cross-section a central web disposed between two side flanges, each of which extend above and below said central web, said portion being disposed between the ends of the tooth body to extend from the downwardly depending shoulder towards that end of the tooth body remote from the nose, the side flanges being supported on the bearing face of the cutter blade, the central web being disposed substantially parallel thereto and the nose being angled with respect to the plane containing the central web so that forces from the tooth tip acting along the nose intersect the web plane adjacent the shoulder.
With such a cutter a far better transmission of forces to the cutter blade is obtained than hitherto, in such a manner that the longitudinal forces applied by the tooth tip are now transmitted almost rectilinearly and without moments to the web of that portion of the tooth body which serves to fasten the tooth body to the cutter blade.
In the known arrangement described above, the longitudinal forces exerted by the tooth tip are transmitted to the region of the shoulder in the first instance substantially in the longitudinal direction of the tooth tip and of the tooth body nose, but then in the region of the shoulder are deflected first approximately perpendicularly upwards and at the height of the web of the U-shaped hollow bowl are again deflected, forming a moment, approximately at right angles in the direction of the end portion of the tooth body remote from the nose. However, for the same expenditure for material, considerably greater stability of shape is achieved with the cutter according to the present invention in comparison with the known arrangement.
Advantageously, the nose is provided in its wedge surfaces with concavities extending in the direction in which the tooth tip is mounted and the recess in the tooth tip is provided on its surfaces adjacent the wedge surfaces of the nose with curved projections which extend longitudinally and match and positively engage in the said concavities.
The position of the exchangeably fastened tooth tip relative to the tooth body is thereby secured in a far better manner than previously, so that even under the most severe working conditions, the preselected direction of the lines of action of the forces applied by the tooth tip on the tooth body is maintained.
In this arrangement it is advantageous for the devices for the exchangeable connection of the tooth tip to the tooth body nose to be designed with negative clearance in order to improve the fit under load with increasing use.
Preferably, the plane of symmetry between the said surfaces of the tooth tip recess which correspond to the wedge surfaces of the nose lies at an acute angle to the plane of symmetry between the converging outer sides of the tooth tip, so that, while one of the converging outer sides of the tooth tip is disposed roughly parallel to, or encloses an obtuse angle of nearly 180 with, the lower side of the cutter blade, but, after rotation of the tooth tip 180 about its longitudinal axis the other outer side of the tooth tip encloses, with the lower side of the cutter blade, a smaller obtuse angle than previously.
Through this arrangement, which is known per se. it is possible, for example when working in heavy soils such as heavy clay, for the direction of the lines of action of the longitudinal forces applied by the tooth tip to the tooth body to be positively influenced to a still greater extent than hitherto, without excluding the possibility of utilising the advantage of a relatively larger clearance angle at the tooth tip.
Suitably, the thickness of the web, starting from the end of the portion remote from the nose, increases continuously in the direction of the shoulder.
An embodiment of the present invention will now be described, by way of example only, and with reference to the accompanying drawings, in which: Figure 1 shows a longitudinal section of the cutter according to the invention, the section being on the line I-I in Figure 2; Figure 2 is a plan view of the same cutters; Figure 3 is a section of the cutter on the line IIIIII in Figure 1; and Figure 4 is a section of the cutter on the line IV-IV in Figure 1.
Referring to the drawings, there is shown a cutter for an excavator. the cutter comprising a tooth fastened onto a cutter blade 1, the tooth comprising a tooth body 2. a tooth tip 3 releasably fastened on the latter, and a connecting pin 4.
The tooth body 2 has a wedge-shaped nose 5 which extends beyond the cutter blade 1 and engages in a recess 6 provided in the tooth tip 3 which matches the shape of the nose 5.
The pin 4 passes through apertures 7 and 8 which are provided in the tooth tip 3 and nose 5 respectively and these apertures are offset relative to one another when the tip is mounted so that the tooth tip 3 is clamped on the nose 5 by means of the pin 4.
Adjoining the nose 5 there is provided on the tooth body 3 a shoulder 9 which is supported against the face of the cutter blade 1.
Adjoining the shouder 9 the tooth body 2 has an H-shaped cross-section disposed between the end portion remote from the nose 5 and the shoulder 9. This portion of H-shaped cross-section comprises a central web 10 between two side flanges 11, each of which extends above and below said central web.
The web 10 of this part of the tooth body extends roughly in a plane parallel to the upper side of the cutter blade 1.
The flanges 11 adjacent the cutter blade 1 are permanently joined to the cutter blade 1 by weld seams (not shown).
The nose 5 is inclined relative to the plane of the web 10 so that the lines of action of the longitudinal forces applied by the tooth tip 3 to the tooth body 2 intersect the web 10 in the region of the shoulder 9.
In the wedge surfaces of the nose 5 there are provided concavities 12 extending in the longitudinal direction of the tooth body 2, and on the sides 13 of the recess 6 disposed opposite these wedge surfaces there are provided curved projections 14, matching the shape of the concavities 12.
The plane of symmetry between the surfaces 13 of the recess intersects the plane of symmetry between the outer sides 15, 15' of the wedge so that, as shown in solid lines in Figure 1, the side 15 encloses with the lower side of the cutter blade 1 a large, almost straight, obtuse angle.
If however the tooth tip 3 is mounted on the nose 5 after being turned 180 about its longitudinal axis, as shown in broken lines (Figure 1), the side 15' forms with the lower side of the cutter blade 1 a smaller obtuse angle then previously, thus giving a larger clearance angle.
WHAT WE CLAIM IS: 1. A cutter for a building machine comprising a cutter blade including a forward edge and a bearing face, and a tooth mounted on the cutter blade, the tooth comprising a tooth body provided with a substantially wedge-shaped nose at one of its ends, a tooth tip mounted on the tooth body and formed with a recess of complementary shape to that of the nose, and a pin which passes through apertures in the tooth body and the tooth tip to fasten and press the tooth tip onto the nose received within the recess, the tooth body comprising a downwardly depending shoulder supported on the for
**WARNING** end of DESC field may overlap start of CLMS **.

Claims (5)

**WARNING** start of CLMS field may overlap end of DESC **. positively engage in the said concavities. The position of the exchangeably fastened tooth tip relative to the tooth body is thereby secured in a far better manner than previously, so that even under the most severe working conditions, the preselected direction of the lines of action of the forces applied by the tooth tip on the tooth body is maintained. In this arrangement it is advantageous for the devices for the exchangeable connection of the tooth tip to the tooth body nose to be designed with negative clearance in order to improve the fit under load with increasing use. Preferably, the plane of symmetry between the said surfaces of the tooth tip recess which correspond to the wedge surfaces of the nose lies at an acute angle to the plane of symmetry between the converging outer sides of the tooth tip, so that, while one of the converging outer sides of the tooth tip is disposed roughly parallel to, or encloses an obtuse angle of nearly 180 with, the lower side of the cutter blade, but, after rotation of the tooth tip 180 about its longitudinal axis the other outer side of the tooth tip encloses, with the lower side of the cutter blade, a smaller obtuse angle than previously. Through this arrangement, which is known per se. it is possible, for example when working in heavy soils such as heavy clay, for the direction of the lines of action of the longitudinal forces applied by the tooth tip to the tooth body to be positively influenced to a still greater extent than hitherto, without excluding the possibility of utilising the advantage of a relatively larger clearance angle at the tooth tip. Suitably, the thickness of the web, starting from the end of the portion remote from the nose, increases continuously in the direction of the shoulder. An embodiment of the present invention will now be described, by way of example only, and with reference to the accompanying drawings, in which: Figure 1 shows a longitudinal section of the cutter according to the invention, the section being on the line I-I in Figure 2; Figure 2 is a plan view of the same cutters; Figure 3 is a section of the cutter on the line IIIIII in Figure 1; and Figure 4 is a section of the cutter on the line IV-IV in Figure 1. Referring to the drawings, there is shown a cutter for an excavator. the cutter comprising a tooth fastened onto a cutter blade 1, the tooth comprising a tooth body 2. a tooth tip 3 releasably fastened on the latter, and a connecting pin 4. The tooth body 2 has a wedge-shaped nose 5 which extends beyond the cutter blade 1 and engages in a recess 6 provided in the tooth tip 3 which matches the shape of the nose 5. The pin 4 passes through apertures 7 and 8 which are provided in the tooth tip 3 and nose 5 respectively and these apertures are offset relative to one another when the tip is mounted so that the tooth tip 3 is clamped on the nose 5 by means of the pin 4. Adjoining the nose 5 there is provided on the tooth body 3 a shoulder 9 which is supported against the face of the cutter blade 1. Adjoining the shouder 9 the tooth body 2 has an H-shaped cross-section disposed between the end portion remote from the nose 5 and the shoulder 9. This portion of H-shaped cross-section comprises a central web 10 between two side flanges 11, each of which extends above and below said central web. The web 10 of this part of the tooth body extends roughly in a plane parallel to the upper side of the cutter blade 1. The flanges 11 adjacent the cutter blade 1 are permanently joined to the cutter blade 1 by weld seams (not shown). The nose 5 is inclined relative to the plane of the web 10 so that the lines of action of the longitudinal forces applied by the tooth tip 3 to the tooth body 2 intersect the web 10 in the region of the shoulder 9. In the wedge surfaces of the nose 5 there are provided concavities 12 extending in the longitudinal direction of the tooth body 2, and on the sides 13 of the recess 6 disposed opposite these wedge surfaces there are provided curved projections 14, matching the shape of the concavities 12. The plane of symmetry between the surfaces 13 of the recess intersects the plane of symmetry between the outer sides 15, 15' of the wedge so that, as shown in solid lines in Figure 1, the side 15 encloses with the lower side of the cutter blade 1 a large, almost straight, obtuse angle. If however the tooth tip 3 is mounted on the nose 5 after being turned 180 about its longitudinal axis, as shown in broken lines (Figure 1), the side 15' forms with the lower side of the cutter blade 1 a smaller obtuse angle then previously, thus giving a larger clearance angle. WHAT WE CLAIM IS:
1. A cutter for a building machine comprising a cutter blade including a forward edge and a bearing face, and a tooth mounted on the cutter blade, the tooth comprising a tooth body provided with a substantially wedge-shaped nose at one of its ends, a tooth tip mounted on the tooth body and formed with a recess of complementary shape to that of the nose, and a pin which passes through apertures in the tooth body and the tooth tip to fasten and press the tooth tip onto the nose received within the recess, the tooth body comprising a downwardly depending shoulder supported on the for
ward edge of the cutter blade and a portion having in transverse cross-section a central web disposed between two side flanges each of which extends above and below said central webs, said portion being disposed between the ends of the tooth body to extend from the downwardly depending shoulder towards that end of the tooth body remote from the nose, the side flanges being supported on the bearing face of the cutter blade, the central web being disposed substantially parallel thereto and the nose being angled with respect to the plane containing the central web so that forces from the tooth tip acting along the nose intersect the web plane adjacent the shoulder.
2. A cutter as claimed in Claim 1, in which the wedge surfaces of the nose are provided with concavities extending in the direction in which the tooth tip is mounted on the tooth body, and the recess in the tooth tip is provided on the surfaces adjacent the wedge surfaces of the nose with curved projections which extend longitudinally and correspond with, and are adapted to engage positively in, the concavities.
3. A cutter as claimed in Claim 2, in which the plane of symmetry between the said surfaces of the tooth tip recess which correspond to the wedge surfaces of the nose is disposed at an acute angle to the plane of symmetry between the converging outer sides of the tooth tip, so that, while one of the converging outer sides of the tooth tip extends substantially parallel to a lower side of the cutter blade so that it encloses an obtuse of nearly 180 with the said lower side of the cutter blade, but, after rotation of the tooth tip through 180 about its longitudinal axis, the other outer side of the tooth tip encloses, with the lower side of the cutter blade, a smaller obtuse angle than previously.
4. A cutter as claimed in any preceding claim, in which the central web increases in thickness continuously in the direction of the shoulder.
5. A cutter for a building machine, substantially as hereinbefore described with reference to Figs. 1 to 4 of the accompanying drawings.
GB10083/78A 1977-10-04 1978-03-14 Cutter for a building machine Expired GB1597554A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE2744497A DE2744497C3 (en) 1977-10-04 1977-10-04 Bucket tooth for excavators or the like.

Publications (1)

Publication Number Publication Date
GB1597554A true GB1597554A (en) 1981-09-09

Family

ID=6020568

Family Applications (1)

Application Number Title Priority Date Filing Date
GB10083/78A Expired GB1597554A (en) 1977-10-04 1978-03-14 Cutter for a building machine

Country Status (10)

Country Link
CH (1) CH628105A5 (en)
DE (1) DE2744497C3 (en)
DK (1) DK276078A (en)
ES (1) ES234837Y (en)
FI (1) FI64828C (en)
FR (1) FR2405334A1 (en)
GB (1) GB1597554A (en)
IT (1) IT1093751B (en)
NO (1) NO147960C (en)
SE (1) SE7804945L (en)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2157650A (en) * 1984-04-18 1985-10-30 Bofors Wear Parts Ab Wear part for earth working tooth
EP1154082A2 (en) * 2000-05-11 2001-11-14 Intertractor GmbH Tooth cap for construction machine
JP2017514050A (en) * 2014-04-28 2017-06-01 メタロヘニア リサーチ アンド テクノロジーズ エセ.エレ. Adapter for attaching teeth to teeth and work machines
US10273662B2 (en) 2006-02-17 2019-04-30 Esco Group Llc Wear assembly

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
SE445125B (en) * 1981-03-26 1986-06-02 Bofors Ab SOIL WORKING MACHINERY SYSTEM
DE3540183A1 (en) * 1985-11-13 1987-05-21 Viehmann & Co Intertrac WASTE COMPRESSOR VEHICLE
US5283965A (en) * 1992-01-21 1994-02-08 H & L Tooth Company Attachment assembly for excavation teeth

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3585741A (en) * 1967-06-29 1971-06-22 Orenstein & Koppel Ag Tooth and guiding means therefor for excavating equipment
US3624827A (en) * 1968-12-11 1971-11-30 Caterpillar Tractor Co Earthworking tooth and supporting adapter
IT1027392B (en) * 1975-01-28 1978-11-20 Ramella P V TOOTH FOR BUCKETS OF EARTH MOVING MACHINES
CH588601A5 (en) * 1975-02-21 1977-06-15 Zepf Hans Rudolf
DE2656427C3 (en) * 1976-12-13 1980-04-17 Tomaso Mirabello Ferrara Mantovani (Italien) Tooth carrier for excavator shovels or the like

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2157650A (en) * 1984-04-18 1985-10-30 Bofors Wear Parts Ab Wear part for earth working tooth
AU572644B2 (en) * 1984-04-18 1988-05-12 Bofors Wear Parts A.B. Wear indication for cap tooth
EP1154082A2 (en) * 2000-05-11 2001-11-14 Intertractor GmbH Tooth cap for construction machine
EP1154082A3 (en) * 2000-05-11 2002-06-26 Intertractor GmbH Tooth cap for construction machine
US10273662B2 (en) 2006-02-17 2019-04-30 Esco Group Llc Wear assembly
JP2017514050A (en) * 2014-04-28 2017-06-01 メタロヘニア リサーチ アンド テクノロジーズ エセ.エレ. Adapter for attaching teeth to teeth and work machines

Also Published As

Publication number Publication date
CH628105A5 (en) 1982-02-15
FR2405334B1 (en) 1980-10-17
DE2744497B2 (en) 1980-03-13
DE2744497A1 (en) 1979-04-12
NO147960C (en) 1983-07-20
ES234837U (en) 1978-05-01
ES234837Y (en) 1978-10-01
FI64828B (en) 1983-09-30
NO782135L (en) 1979-04-05
DE2744497C3 (en) 1982-11-04
NO147960B (en) 1983-04-05
IT7821064A0 (en) 1978-03-09
IT1093751B (en) 1985-07-26
DK276078A (en) 1979-04-05
FR2405334A1 (en) 1979-05-04
SE7804945L (en) 1979-04-05
FI781952A (en) 1979-04-05
FI64828C (en) 1984-01-10

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Legal Events

Date Code Title Description
PS Patent sealed [section 19, patents act 1949]
PCNP Patent ceased through non-payment of renewal fee