GB2234944A - Attaching tooth to vehicle wheel - Google Patents

Attaching tooth to vehicle wheel Download PDF

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Publication number
GB2234944A
GB2234944A GB9011063A GB9011063A GB2234944A GB 2234944 A GB2234944 A GB 2234944A GB 9011063 A GB9011063 A GB 9011063A GB 9011063 A GB9011063 A GB 9011063A GB 2234944 A GB2234944 A GB 2234944A
Authority
GB
United Kingdom
Prior art keywords
part
tooth
machine
adapted
parts
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.)
Withdrawn
Application number
GB9011063A
Other versions
GB9011063D0 (en
Inventor
Malcolm Collins
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.)
WFS
Original Assignee
WFS
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
Priority to GB898911626A priority Critical patent/GB8911626D0/en
Application filed by WFS filed Critical WFS
Publication of GB9011063D0 publication Critical patent/GB9011063D0/en
Publication of GB2234944A publication Critical patent/GB2234944A/en
Application status is Withdrawn legal-status Critical

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Classifications

    • BPERFORMING OPERATIONS; TRANSPORTING
    • B60VEHICLES IN GENERAL
    • B60BVEHICLE WHEELS; CASTORS; AXLES FOR WHEELS OR CASTORS; INCREASING WHEEL ADHESION
    • B60B15/00Wheels or wheel attachments designed for increasing traction

Abstract

A vehicle has wheels formed for compaction of infill at landfill sites. Each wheel has a plurality of teeth and each tooth comprises a first part 1 welded to the wheel rim 3 and a second part 2 fixed to the first part 1. The first part 1 is formed of material to facilitate welding (4, Fig 3) and the second part is made of, or wholly or partially coated with, a wear resistant material. Both parts have complementary formations 10, 11 which enable the second part 2 to be drawn down tightly onto the first part 1 and the rim 3. The arrangement facilitates onsite replacement of teeth which increases vehicle flexibility and reduces vehicle downtime. <IMAGE>

Description

TOOTH ATTACHMENT The present invention relates to a tooth for attachment to a machine and to a machine equipped with such teeth. The machine may be a vehicle for use in the compaction of infill at landfill sites.

When "landfill" disposal of waste became an organised enterprise, heavy tractors have been used to move the infill material around and to achieve a certain amount of compaction. The activity proved to be very hard on the rubber tyres of the tractros and very costly in tyre replacement. In an attempt to overcome this problem, steel rims were fitted over the tyres.

This was achieved by deflating the tyre, positioning the rim and then reflating. This provided protection for the rubber but significantly reduced the traction, to compensate angle bars were welded to the rims.

Since that time an industry has grown around "landfill" technology and considerable progress has been made in the development of steel wheels for "landfill" vehicles. In particular, considerable attention has been focussed on the shape and disposition of "teeth" attached to the outer rim of the wheel to provide traction cutting action and compaction.

These machines work in an extremely hostile environment and the surfaces in contact with the "fill" material are subject to heavy abrasion and impact. The choice of material for the "teeth" is of paramount importance. Up until now teeth had to have good wear properties, good impact resistance and be weldable t6 the steel wheel rim. This latter requirement limited the range of "abrasion resistant" materials available for selection.

According to one aspect of the present invention, there is provided a tooth for attachment to a machine comprising a first part which is adapted for permanent attachment to the machine and a second part adapted to receive the first part and means for detachably connecting the first and second parts together.

According to another aspect of the present invention, there is provided a vehicle ground contacting member comprising a rim and a plurality of teeth protruding therefrom each comprising first and second parts, the first part of which is permanently fixed to the rim and the second part of which is adapted to receive the first part and to be detachably connected thereto.

According to a further aspect of the invention, there is provided a member for a tooth attachment for a machine which defines an internal cavity adapted to receive another part attached to the machine, the internal cavity having wedge surfaces which coact with corresponding surfaces on the said other part which enable the member on relative movement between the parts to be tightly drawn up to the machine and attached thereto.

In a preferred embodiment of the invention, the second part is made of a wear resistant material or has a coating of wear resistant material in whole or in part.

The particular material chosen is chosen in dependence upon the particular task for which the tooth is intended. Examples of material are spheroidal graphite iron or steel, or chromium alloyed iron, all such materials being specified in British Standards 2789 or 3100 or 4844 Pt.3 respectively. Materials at the lower order of this range can have their abrasion resistance properties improved by hardfacing by welding using materials ranging from iron - chromium - carbon alloys to tungsten carbide impregnated deposits.

The material of the first part is chosen to facilitate it fixing to the machine. This will normally be by welding. Examples of material are carbon or alloyed steel. The first part comprises a specially shaped projection which may be inserted into a cavity of complementary shape in the second part. The external surface of the first part and internal surface of the cavity are provided with faces which coact to provide a wedge effect. This in turn enables the parts to be relatively moved after insertion of the first in the second so that the second can be drawn tightly up against the part of the machine to which the first part is fixed. That part of the machine will usually be the steel rim of the vehicle wheel or track in the case of a landfill vehicle. The number and position of the teeth can be varied as required.

In order that the invention may be more clearly understood, one embodiment thereof will now be described, by way of example, with reference to the accompanying drawings in which: Figure 1 shows a side elevational view of a tooth partially sectioned along its longitudinal centre line.

Figure 2 shows a cross-sectional view of the tooth of Figure 1 along the line A-A of Figure 1.

Figure 3 shows a diagrammatic view of the tooth of Figures 1 and 2 in position on a vehicle wheel rim, and Figure 4 is a diagrammatic exploded view of part of the arrangement of Figures 1 to 3.

Referring to the drawings, the tooth comprises two parts respectively referenced 1 and 2. Part 2 is made of wear resistant material usually by casting.

Suitable materials are spheroidal graphite iron or steel, or chromium alloyed iron, all such materials being specified in British Standards 2789 or 3100 or 4844 Pt.3 respectively. Materials at the lower order of this range can have their abrasion resistance properties improved by hardfacing by welding using materials ranging from iron - chromium - carbon alloys to tungsten carbide impregnated deposits. The choice is made in dependence upon the use to which the material is to be put. Part 2 defines an internal cavity which is adapted to receive part 1 and which will be described in more detail later.

Part 1 is made for example by casting or from a metal suitable for welding to the steel outer rim 3 of a landfill vehicle. Preferred metals are carbon or alloyed steel but again the choice will depend upon the particular application. The line of welding 4 extends completely around the lower periphery of part 1 and to improve the strength of the bond between part 1 and the rim 3 the length of line 4 should be as large as possible within the confines of the other parameters which have to be met. Part 1 is divergent in cross-sectional area from right to left as viewed in Figures 1 and 4 and is machined to provide wedge surfaces 5 and 6 on opposite lateral sides respectively. The base periphery of part 1 is bevelled at 7 to facilitate welding. An internally screwthreaded bore 8 is machined in one end of part 1.

On each lateral face of part 1, a channel 9 extends between two projections which provide the wedge surfaces 6. The base of the channel is in the same plane as the surface 5.

The internal cavity in part 2 is large enough to receive part 1 within it and has formations 10 which complement those on part 1. These formations provide wedge surfaces 11 which coact with wedge surfaces 5 and 6 on part 1. The formations 10 project internally of the internal wall of the cavity and define gaps 12 therebetween. These gaps 12 enable the projections on part 1, which provide the wedge surfaces 5 and 6, to pass between the formations 10 when part 2 is placed over part 1. When this has been done, the two parts may be moved laterally relative to one another so that they engage. As part 2 moves from right to left over of part 1 (see Figure 1), wedge surfaces 10 on part 2 coact with wedge surfaces 6 on part 1 to draw part 1 tightly into the cavity. For this purpose, these surfaces 6 and 10 are inclined to the surface of the rim 3. Eventually, the undersurface 12A of part 2 abutts the surface of the rim 3. This undersurface is curved to match as far as possible the curvature of the rim 3 itself. The abuttment of these two surfaces serves to protect part 1 from any material being acted upon by the wheel. As part 2 moves from right to left, wedge surfaces 5 also coact with wedge surfaces 13 in the cavity. These surfaces are convergent in that direction and this movement wedges the two parts 1 and 2 tightly together. They are locked in this position by a bolt 15 which extends through an aperture 14 in part 21 and is screwed into the internally screwthreaded aperture to draw the parts tightly together. The bolt 15 is locked in position by a spring steel washer 16 and the bolt is protected from ingress of foreign matter by a plastics cap 17.As a. further precaution a water tight sealant may be coated on the rim of the wheel prior to part 1 being positioned. Also, a thread locking compound may be used on the securing bolt 15 in addition to spring steel washer 16. Furthermore, if desired to improve rigidity and/or prevent or inhibit the ingress of material which might decay into the cavity in part 2, airspace remaining between the two parts may be filled after tightening the parts together with a self-hardening epoxy type resin or equivalent.

The above described arrangement offers the following advantages. The configuration of the components precludes any contact between part 1 and the landfill material thereby preventing any wear or corrosion of that part in service and ensuring easy removal and replacement part 2. Selection of part 2 material can be made on basis of suitability for a particular environment independent of welding considerations. Replacement of worn or damaged part 2 can be carried out by unskilled labour on site, whereas at present it is necessary to send skilled operators to site with welding machines, air compressor and vehicle jacking equipment. Alternatively, the wheels are returned to factory for refurbishment. The dimensions and shape of part 1 is common to part 2's independent of external profile and purpose. Consequently it will be possible to change the type of the tooth as to material-and/or extenal shape and profile to suit changes in landfill material characteristics. For example, if a site predominantly intended for domestic waste starts to accept industrial spoil, or if the cover material used to bury the waste is changed from soil to sand or gravel. If such a change was contemplated at present it would involve either extensive work on site or, more likely, returning the wheels to the factory.

It will be appreciated that the above embodiment has been described by way of example only and that many variations are possible without departing from the invention.

Claims (11)

1. A tooth for attachment to a machine comprising a first part which is adapted for permanent attachment to the machine and a second part adapted to receive the first part and means for detachably connecting the first and second parts together.
2. A tooth as claimed in claim 1, in which the second part is made of a wear resistant material or has a coating of wear resistant material in whole or in part.
3. A tooth as claimed in claim 2, in which the wear resistant material is spheroidal graphite iron or steel, or chromium alloyed iron.
4. A tooth as claimed in any preceding claim, in which the first part comprises a specially shaped projection which may be inserted into a cavity of complementary shape in the second part.
5. A tooth as claimed in claim 4, in which the external surface of the first part and the internal surface of the cavity are provided with faces which coact to provide a wedge effect.
6. A tooth as claimed in claim 5, in which the coacting faces are arranged so that the parts may be relatively moved after insertion of the projection in the cavity so that the second part can be drawn tightly against the surface of a machine to which the first part is fixed.
7. A tooth as claimed in any preceding claim, in which means are provided for drawing the two parts together and for locking them in that position.
8. A tooth as claimed in claim 7, in which the means for drawing the parts together comprise a screwthreaded bolt adapted for insertion through an opening in the second part into a complementary screwthreaded bore in the first part.
9. A tooth as claimed in any preceding claim, in which the first part is adapted for attachment to a machine by welding.
10. A vehicle ground contacting member comprising a rim and a plurality of teeth protruding therefrom each comprising first and second parts, the first part of which is permanently fixed to the rim and the second part of which is adapted to receive the first part and to be detachably connected thereto.
11. A member for a tooth attachment for a machine which defines an internal cavity adapted to receive another part attached to the machine, the internal cavity having wedge surfaces which coact with corresponding surfaces on the said other part which enable the member on relative movement between the parts to be tightly drawn up to the machine and attached thereto.
GB9011063A 1989-05-19 1990-05-17 Attaching tooth to vehicle wheel Withdrawn GB2234944A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB898911626A GB8911626D0 (en) 1989-05-19 1989-05-19 Tooth attachment

Publications (2)

Publication Number Publication Date
GB9011063D0 GB9011063D0 (en) 1990-07-04
GB2234944A true GB2234944A (en) 1991-02-20

Family

ID=10657078

Family Applications (2)

Application Number Title Priority Date Filing Date
GB898911626A Pending GB8911626D0 (en) 1989-05-19 1989-05-19 Tooth attachment
GB9011063A Withdrawn GB2234944A (en) 1989-05-19 1990-05-17 Attaching tooth to vehicle wheel

Family Applications Before (1)

Application Number Title Priority Date Filing Date
GB898911626A Pending GB8911626D0 (en) 1989-05-19 1989-05-19 Tooth attachment

Country Status (1)

Country Link
GB (2) GB8911626D0 (en)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2290506A (en) * 1994-05-28 1996-01-03 Intertractor Ag Adapter and cap arrangement for refuse compaction vehicle wheel
EP0760033A1 (en) * 1995-03-15 1997-03-05 Caron Compactor Company Improved transfer station wheels
GB2386878A (en) * 2002-03-28 2003-10-01 Caterpillar Inc Compactor tooth assembly and retaining means
WO2009025776A1 (en) * 2007-08-17 2009-02-26 Caterpillar Inc. Two-piece compactor wheel tip

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB415803A (en) * 1933-03-06 1934-09-06 John Whitehouse Improvements in and relating to spade lugs for the wheels of agricultural tractors
GB573300A (en) * 1944-10-16 1945-11-14 Norman Vandepeer Clarke Improvements in spade lugs or "spuds" for vehicle wheels
GB857439A (en) * 1958-11-05 1960-12-29 Carl Georg Wadell Improvements in ground-engaging means for vehicles
GB1142141A (en) * 1965-02-17 1969-02-05 Austin Hoy & Co Ltd Improvements in or relating to cutter tools and mountings therefor
US4261622A (en) * 1979-08-01 1981-04-14 Miller James B Automotive vehicle wheel for travel on ice or snow
US4668122A (en) * 1985-11-20 1987-05-26 Rexworks Inc. Two bolt taper cleat
EP0225469A1 (en) * 1985-11-13 1987-06-16 Intertractor Viehmann GmbH. &amp; Co Vehicle for compacting refuse

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB415803A (en) * 1933-03-06 1934-09-06 John Whitehouse Improvements in and relating to spade lugs for the wheels of agricultural tractors
GB573300A (en) * 1944-10-16 1945-11-14 Norman Vandepeer Clarke Improvements in spade lugs or "spuds" for vehicle wheels
GB857439A (en) * 1958-11-05 1960-12-29 Carl Georg Wadell Improvements in ground-engaging means for vehicles
GB1142141A (en) * 1965-02-17 1969-02-05 Austin Hoy & Co Ltd Improvements in or relating to cutter tools and mountings therefor
US4261622A (en) * 1979-08-01 1981-04-14 Miller James B Automotive vehicle wheel for travel on ice or snow
EP0225469A1 (en) * 1985-11-13 1987-06-16 Intertractor Viehmann GmbH. &amp; Co Vehicle for compacting refuse
US4668122A (en) * 1985-11-20 1987-05-26 Rexworks Inc. Two bolt taper cleat
EP0225708A1 (en) * 1985-11-20 1987-06-16 Rexworks Inc. Cleat

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2290506A (en) * 1994-05-28 1996-01-03 Intertractor Ag Adapter and cap arrangement for refuse compaction vehicle wheel
AU683367B2 (en) * 1994-05-28 1997-11-06 Intertractor Aktiengesellschaft Adapter and cap for waste compaction vehicle
GB2290506B (en) * 1994-05-28 1998-07-29 Intertractor Ag An adapter and cap arrangement for a wheel of a refuse compaction vehicle
EP0760033A1 (en) * 1995-03-15 1997-03-05 Caron Compactor Company Improved transfer station wheels
EP0760033A4 (en) * 1995-03-15 1999-05-06 Caron Compactor Co Improved transfer station wheels
GB2386878A (en) * 2002-03-28 2003-10-01 Caterpillar Inc Compactor tooth assembly and retaining means
GB2386878B (en) * 2002-03-28 2006-09-20 Caterpillar Inc Retainer for a compactor tooth
WO2009025776A1 (en) * 2007-08-17 2009-02-26 Caterpillar Inc. Two-piece compactor wheel tip

Also Published As

Publication number Publication date
GB9011063D0 (en) 1990-07-04
GB8911626D0 (en) 1989-07-05

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WAP Application withdrawn, taken to be withdrawn or refused ** after publication under section 16(1)