FI126840B - Wear shoe and process for manufacturing a wear shoe - Google Patents

Wear shoe and process for manufacturing a wear shoe Download PDF

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Publication number
FI126840B
FI126840B FI20145848A FI20145848A FI126840B FI 126840 B FI126840 B FI 126840B FI 20145848 A FI20145848 A FI 20145848A FI 20145848 A FI20145848 A FI 20145848A FI 126840 B FI126840 B FI 126840B
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FI
Finland
Prior art keywords
inserts
wear shoe
base plate
protective edge
shoe according
Prior art date
Application number
FI20145848A
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Finnish (fi)
Swedish (sv)
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FI20145848A (en
Inventor
Lennart Burström
Original Assignee
Olofsfors Ab
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 Olofsfors Ab filed Critical Olofsfors Ab
Publication of FI20145848A publication Critical patent/FI20145848A/en
Application granted granted Critical
Publication of FI126840B publication Critical patent/FI126840B/en

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Classifications

    • E—FIXED CONSTRUCTIONS
    • E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
    • E01H—STREET CLEANING; CLEANING OF PERMANENT WAYS; CLEANING BEACHES; DISPERSING OR PREVENTING FOG IN GENERAL CLEANING STREET OR RAILWAY FURNITURE OR TUNNEL WALLS
    • E01H5/00—Removing snow or ice from roads or like surfaces; Grading or roughening snow or ice
    • E01H5/04—Apparatus propelled by animal or engine power; Apparatus propelled by hand with driven dislodging or conveying levelling elements, conveying pneumatically for the dislodged material
    • E01H5/06—Apparatus propelled by animal or engine power; Apparatus propelled by hand with driven dislodging or conveying levelling elements, conveying pneumatically for the dislodged material dislodging essentially by non-driven elements, e.g. scraper blades, snow-plough blades, scoop blades
    • E01H5/065—Apparatus propelled by animal or engine power; Apparatus propelled by hand with driven dislodging or conveying levelling elements, conveying pneumatically for the dislodged material dislodging essentially by non-driven elements, e.g. scraper blades, snow-plough blades, scoop blades characterised by the form of the snow-plough blade, e.g. flexible, or by snow-plough blade accessories
    • E01H5/066—Snow-plough blade accessories, e.g. deflector plates, skid shoes
    • E—FIXED CONSTRUCTIONS
    • E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02F—DREDGING; SOIL-SHIFTING
    • E02F3/00—Dredgers; Soil-shifting machines
    • E02F3/04—Dredgers; Soil-shifting machines mechanically-driven
    • E02F3/76—Graders, bulldozers, or the like with scraper plates or ploughshare-like elements; Levelling scarifying devices
    • E02F3/80—Component parts
    • E02F3/815—Blades; Levelling or scarifying tools
    • E02F3/8157—Shock absorbers; Supports, e.g. skids, rollers; Devices for compensating wear-and-tear, or the like

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  • Engineering & Computer Science (AREA)
  • Civil Engineering (AREA)
  • Structural Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Mining & Mineral Resources (AREA)
  • General Engineering & Computer Science (AREA)
  • Architecture (AREA)
  • Footwear And Its Accessory, Manufacturing Method And Apparatuses (AREA)

Description

Wear shoe and method for producing a wear shoe
FIELD OF THE INVENTION AND PRIOR ART
The present invention relates to a wear shoe for supporting a snow plough or grader blade against a road surface or ground surface. The invention also relates to a method for producing such a wear shoe.
Wear shoes are often used on vehicle-mounted snow ploughs in order to support the snow plough against the road surface or ground surface to be scraped by the snow plough. The respective wear shoe is provided with a lower sliding surface, through which the wear shoe is intended to slidably bear against a road surface or ground surface. The wear shoes are mounted to the snow plough with their sliding surfaces located slightly beneath the lower edge of the plough blade in order to keep the lower edge of the plough blade at a short distance from the road surface or ground surface. The plough blade is hereby protected from wear and from getting damaged by hitting fixed obstacles that project slightly above the road surface or ground surface.
Wear shoes of the above-mentioned type are disclosed in WO 89/01545 A1 and US 5 127 175 A. These previously known wear shoes are generally made of cast iron or steel and may wear out after a relatively short period of time. FI793807 shows a plough plate made of steal and a sliding surface made of rubber.
OBJECT OF THE INVENTION
The object of the present invention is to provide a wear shoe having a new and favourable design with good wear resistance characteristics.
SUMMARY OF THE INVENTION
According to the invention, said object is achieved by a wear shoe having the features defined in claim 1.
The wear shoe according to the invention is characterized in: - that the wear shoe comprises: • a casing comprising a horizontal base plate and a protective rim, the protective rim being annular and the protective rim being fixed to the base plate and projecting downwards from the underside of the base plate, and • a sliding body, through which the wear shoe is intended to slidably bear against a road surface or ground surface, the sliding body being arranged in the casing and fixed to the underside of the base plate; - that the protective rim extends around and is fixed to a peripheral edge of the sliding body; and - that the sliding body comprises an elastic matrix of rubber material and inserts of wear resistant hard material embedded in the matrix, the respective insert having an exposed lower surface which is arranged to be in sliding contact with a road surface or ground surface when the wear shoe bears against said surface through the sliding body; and - that the elastic matrix fills up an annular pocket formed between the underside of the base plate and an oblique inner surface of the protective rim.
The wear shoe according to the invention will slide against the road surface or ground surface through the inserts of wear resistant hard material, and the wear shoe is thereby subjected to reduced wear. Furthermore, these inserts will slide relatively easily on the road surface or ground surface due to their hardness and the inserts will thereby give the wear shoe good sliding characteristics. A disadvantage with a material which has a high hardness is that such a material is generally very brittle and sensitive to impacts. However, due to the fact that the brittle and wear resistant hard material inserts are embedded in an elastic matrix of rubber material, they are able to withstand sudden impacts which could destroy the inserts if they had been rigidly and non-elastically mounted to the wear shoe. Furthermore, the base plate and the protective rim will keep the elastic matrix in place in the wear shoe and protect it from mechanical damages.
An embodiment of the invention is characterized in: - that the sliding body comprises a horizontal stabilizing plate, which is embedded in the matrix and provided with through holes for receiving the inserts; and - that the upper ends of the inserts extend into a respective one of said through holes, the upper end of the respective insert being received in the associated through hole with play.
The stabilizing plate will define the positions of the inserts in the sliding body in the horizontal direction and will keep the inserts correctly positioned in relation to each other and in relation to the protective rim during the manufacturing of the wear shoe. Since the inserts are received with play in the through holes of the stabilizing plate, the stabilizing plate will not interfere with the elastic embedment of the inserts in the elastic matrix.
Further advantages as well as advantageous features of the wear shoe according to the invention will appear from the following description and the dependent claims.
The invention also relates to a method as defined in claim 12 for producing a wear shoe.
With the method according to the invention, the wear shoe may be produced in a simple and efficient manner, while ensuring a correct positioning of the inserts in the sliding body.
BRIEF DESCRIPTION OF THE DRAWINGS
With reference to the appended drawings, a specific description of preferred embodiments of the invention cited as examples follows below. In the drawings:
Fig 1 is a planar view from below of a wear shoe according to an embodiment of the present invention,
Fig 2 is a cut lateral view of the wear shoe of Fig 1, and
Fig 3 is an exploded view of parts included in the wear shoe of Figs 1 and 2.
DETAILED DESCRIPTION OF PREFERRED EMBODIMENTS OF THE INVENTION A wear shoe 1 according to an embodiment of the present invention is shown in Figs 1 and 2. The wear shoe 1 is intended to be mounted to a snow plough or grader blade in order to support it against a road or the ground. The wear shoe 1 comprises a casing 2 and a sliding body 3 arranged in the casing.
The casing 2 is of metal, for instance iron or steel, and comprises a horizontal base plate 4 and a protective rim 5. The base plate 4 has an upper side 4a and an underside 4b. The wear shoe 1 is to be mounted to a snow plough or grader blade with the upper side 4a of the base plate facing upwards and the underside 4b of the base plate facing downwards. In the illustrated example, the base plate 4 is provided with threaded holes 6, through which the wear shoe 1 can be mounted to a snow plough or grader blade by means of threaded fastening members. As an alternative, the base plate 4 could be provided with any other suitable type of attachment for the mounting of the wear shoe 1 to a snow plough or grader blade. The wear shoe 1 may also be mounted to a snow plough or grader blade by welding.
The protective rim 5 is fixed to the base plate 4 and projects downwards from the underside 4b thereof. The protective rim 5 extends along the outer edge of the base plate 4 and has an oblique outer surface 5a, which is inclined inwards as seen from the bottom plate 4 and downwards. In the illustrated example, the base plate 4 is circular and the protective rim 5 annular. The base plate 4 and the protective rim 5 are preferably made of steel. The casing 2 is preferably formed in one piece, for instance by pressure turning. As an alternative, the base plate 4 and the protective rim 5 may be formed as separate members which are fixed to each other by welding.
The sliding body 3 has an upper side 3a, which is fixed to the underside 4b of the base plate, and an exposed underside, through which the wear shoe 1 is intended to slidably bear against a road surface or ground surface. The sliding body 3 also has a peripheral edge 3c, which extends peripherally around the sliding body between the upper side 3a and the underside of the sliding body. The protective rim 5 extends around and is fixed to the peripheral edge 3c of the sliding body 3.
The sliding body 3 comprises an elastic matrix 7 of rubber material and several inserts 8 of wear resistant hard material embedded in the matrix. The matrix 7 is vulcanized to the base plate 4, to the protective rim 5 and to the inserts 8. The matrix 7 is in contact with and fixed to the oblique inner surface 5b and the inner end surface 5c of the protective rim, and it fills up an annular pocket 9 formed between the underside 4b of the base plate and the oblique inner surface 5b of the protective rim.
The inserts 8 are spaced from each other in the horizontal direction and spaced from the protective rim 5 and the underside 4b of the base plate. The matrix 7 fills up the interspaces between the inserts 8, the interspace between the inserts and the base plate 4 and the interspace between the inserts and the protective rim 5. Thus, the inserts 8 are not in direct contact with the casing 2. The respective insert 8 has an exposed lower surface 8a which is arranged to be in sliding contact with a road surface or ground surface when the wear shoe 1 bears against said surface through the sliding body 3. Said lower surfaces 8a of the inserts are flush with each other and extend in a horizontal plane P located below the lower edge 5d of the protective rim 5. The lower surface 8a of the respective insert 8 is preferably flat.
The respective insert 8 is preferably cylindrical and arranged in the matrix 7 with its longitudinal axis extending perpendicularly to the base plate 4. The inserts 8 are made of a material which has a higher hardness than the material from which the protective rim 5 is made. The inserts 8 are with advantage of ceramic material, preferably aluminium oxide, or cemented carbide, preferably wolfram carbide.
In the illustrated embodiment, the sliding body 3 comprises a horizontal stabilizing plate 10, which is embedded in the matrix 7 and provided with through holes 11 for receiving the inserts 8. The upper ends of the inserts 8 extend into a respective one of said through holes 11. The diameter of the respective through hole 11 is slightly larger than the diameter of the insert 8 received therein. Thus, the upper end of the respective insert 8 is received in the associated through hole 11 with play. The stabilizing plate 10 extends in parallel with the base plate 4 and is spaced from the underside 4b of the base plate. The matrix 7 fills up the interspace between the stabilizing plate 10 and the base plate 4. The stabilizing plate 10 is preferably of steel.
Fig 3 shows the casing 2, the stabilizing plate 10 and the inserts 8 in an unassembled state.
When the wear shoe 1 is to be assembled, a casing 2 of the above-mentioned type is placed upside-down with the protective rim 5 and the underside 4b of the base plate pointing upwards, as illustrated in Fig 3. The underside 4b of the base plate is then covered by a layer of rubber material in powdered or granular form or in the form of a sheet. Thereafter, the stabilizing plate 10 is placed on said layer, whereupon the inserts 8 are placed on said layer with an end of the respective insert received with play in an associated through hole 11 in the stabilizing plate 10. The interspaces between the inserts 8 and the interspace between the inserts 8 and the protective rim 5 are then filled with rubber material, preferably in powdered or granular form. The rubber material is then melted by being heated to a temperature of approximately 200°C and thereafter subjected to cooling in order to vulcanize the rubber material to the bottom plate 4, to the protective rim 5, to the stabilizing plate 10 and to the inserts 8. The stabilizing plate 10 and the inserts 8 are thereby embedded in the matrix 7 formed within the casing 2 by the melting and cooling of the rubber material.
The invention is of course not in any way restricted to the embodiments described above. On the contrary, many possibilities to modifications thereof will be apparent to a person with ordinary skill in the art without departing from the basic idea of the invention such as defined in the appended claims.

Claims (12)

1. Slitsko för att stödja en snöplog eller ett väghyvelblad mot en vägyta eller markyta, kännetecknad därav: - att slitskon (1) innefattar: • ett hölje (2) innefattande en horisontell basplatta (4) och en skyddskant (5), varvid skyddskanten (5) är ringformig och skyddskanten (5) är fäst vid basplattan (4) och skjuter ut nedåt från basplattans undersida (4b), och • en glidkropp (3), via vilken slitskon (1) är avsedd att glidande anligga mot en vägyta eller markyta, varvid glidkroppen (3) är anordnad i höljet (2) och fäst vid basplattans undersida (4b); - att skyddskanten (5) sträcker sig runt och är fäst vid en yttre kant (3c) hos glidkroppen (3); - att glidkroppen (3) innefattar en elastisk matris (7) av gummimaterial och inlägg (8) av nötningsbeständigt hårt material inbäddade i matrisen, varvid respektive inlägg (8) har en exponerad nedre yta (8a) som är anordnad att vara i glidkontakt med en vägyta eller markyta när slitskon (1) anligger mot nämnda yta via glidkroppen (3); och - att den elastiska matrisen (7) fyller ut en ringformig ficka (9) bildad mellan undersidan (4b) hos basplattan (4) och en snedställd invändig yta (5b) hos skyddskanten (5).A wear shoe for supporting a snow plow or a road razor blade against a road surface or ground surface, characterized in that: - the wear shoe (1) comprises: • a housing (2) comprising a horizontal base plate (4) and a protective edge (5), the protective edge (5) is annular and the protective edge (5) is attached to the base plate (4) and projects downwardly from the underside (4b) of the base plate, and • a sliding body (3), through which the wear shoe (1) is intended to slide abutably against a road surface or ground surface, wherein the sliding body (3) is arranged in the housing (2) and fixed to the underside (4b) of the base plate; - the protective edge (5) extends around and is attached to an outer edge (3c) of the sliding body (3); - the slide body (3) comprises an elastic matrix (7) of rubber material and inserts (8) of abrasion resistant hard material embedded in the matrix, the respective inserts (8) having an exposed lower surface (8a) arranged to be in sliding contact with the a road surface or ground surface when the wear shoe (1) abuts against said surface via the sliding body (3); and - the elastic matrix (7) fills an annular pocket (9) formed between the underside (4b) of the base plate (4) and an oblique internal surface (5b) of the protective edge (5). 2. Slitsko enligt krav 1, kännetecknad därav, att nämnda nedre ytor (8a) hos inläggen (8) är i jämnhöjd med varandra och sträcker sig i ett horisontalplan (P) beläget under den nedre kanten (5d) hos skyddskanten (5).Wear shoe according to claim 1, characterized in that said lower surfaces (8a) of the inserts (8) are evenly aligned with each other and extend in a horizontal plane (P) located below the lower edge (5d) of the protective edge (5). 3. Slitsko enligt krav 1 eller 2, kännetecknad därav, att respektive inlägg (8) är cylindriskt och anordnat i matrisen (7) med sin längdaxel sträckande sig vinkelrätt mot basplattan (4).Wear shoe according to claim 1 or 2, characterized in that the respective inserts (8) are cylindrical and arranged in the matrix (7) with its longitudinal axis extending perpendicular to the base plate (4). 4. Slitsko enligt något av kraven 1-3, kännetecknad därav, att inläggen (8) är av keramiskt material, företrädesvis aluminiumoxid, eller hårdmetall, företrädesvis volframkarbid.Wear shoe according to any one of claims 1-3, characterized in that the inserts (8) are of ceramic material, preferably alumina, or cemented carbide, preferably tungsten carbide. 5. Slitsko enligt något av kraven 1-4, kännetecknad därav, att matrisen (7) är fastvulkaniserad vid basplattan (4), vid skyddskanten (5) och vid inläggen (8).Wear shoe according to any one of claims 1-4, characterized in that the die (7) is fixedly vulcanized at the base plate (4), at the protective edge (5) and at the inserts (8). 6. Slitsko enligt något av kraven 1-5, kännetecknad därav, att skyddskanten (5) har en snedställt yttre yta (5a) som lutar inåt sett från bottenplattan (4) och nedåt.Wear shoe according to any one of claims 1-5, characterized in that the protective edge (5) has an oblique outer surface (5a) which slopes inwards as seen from the bottom plate (4) and downwards. 7. Slitsko enligt något av kraven 1-6, kännetecknad därav, att skyddskanten (5) är av stål eller järn.Wear shoe according to any one of claims 1-6, characterized in that the protective edge (5) is of steel or iron. 8. Slitsko enligt något av kraven 1-7, kännetecknad därav, att basplattan (4) är av stål eller järn.Wear shoe according to any one of claims 1-7, characterized in that the base plate (4) is of steel or iron. 9. Slitsko enligt något av kraven 1-8, kännetecknad därav, att höljet (2) är utformat i ett stycke.Wear shoe according to any one of claims 1-8, characterized in that the housing (2) is integrally formed. 10. Slitsko enligt något av kraven 1-9, kännetecknad därav: - att glidkroppen (3) innefattar en horisontell stabiliserings-platta (10) som är inbäddad i matrisen (7) och försedd med genomgående hål (11) för mottagning av inläggen (8); och - att de övre ändarna hos inläggen (8) sträcker sig in i varsitt av nämnda genomgående hål (11), varvid den övre änden hos respektive inlägg (8) är mottagen i det tillhörande genomgående hålet (11) med spel.Wear shoe according to any one of claims 1-9, characterized in that - the slide body (3) comprises a horizontal stabilizing plate (10) embedded in the matrix (7) and provided with through holes (11) for receiving the inserts (11). 8); and - the upper ends of the inserts (8) extend into each of said through-holes (11), the upper end of the respective inserts (8) being received in the associated through-hole (11) with play. 11. Slitsko enligt krav 10, kännetecknad därav, att stabiliseringsplattan (10) sträcker sig parallellt med basplattan (4).Wear shoe according to claim 10, characterized in that the stabilizing plate (10) extends parallel to the base plate (4). 12. Förfarande för tillverkning av en slitsko (1) enligt krav 10 eller 11, kännetecknat därav, att förfarandet innefattar följande steg: - tillhandahållande av höljet (2); - placering av höljet (2) upp och ner med undersidan (4b) hos basplattan (4) riktad uppåt; - täckning av undersidan (4b) hos basplattan med ett lager av gummimaterial; - placering av stabiliseringsplattan (10) på nämnda lager; - placering av inläggen (8) på nämnda lager med en ände hos respektive inlägg mottagen med spel i ett tillhörande genomgående hål (11) i stabiliseringsplattan (10); - fyllning av mellanrummen mellan inläggen (8) och mellanrummet mellan inläggen och skyddskanten (5) med gummimaterial, företrädesvis i pulver- eller kornform; och - smältning och därefter kylning av gummimaterialet för att fastvulkanisera gummimaterialet vid bottenplattan (4), vid skyddskanten (5), vid stabiliseringsplattan (10) och vid inläggen (8), varvid gummimaterialet därigenom bildar den elastiska matrisen (7).Method for manufacturing a wear shoe (1) according to claim 10 or 11, characterized in that the method comprises the following steps: - providing the housing (2); - positioning the housing (2) upside down with the underside (4b) of the base plate (4) facing upwards; - covering the underside (4b) of the base plate with a layer of rubber material; - placing the stabilizer plate (10) on said bearing; - placing the inserts (8) on said bearings with one end of the respective inserts received with clearance in an associated through-hole (11) in the stabilizing plate (10); filling the gaps between the inserts (8) and the gaps between the inserts and the protective edge (5) with rubber material, preferably in powder or granular form; and - melting and then cooling the rubber material to firmly vulcanize the rubber material at the bottom plate (4), at the protective edge (5), at the stabilizing plate (10) and at the inserts (8), the rubber material thereby forming the elastic matrix (7).
FI20145848A 2012-04-12 2014-09-29 Wear shoe and process for manufacturing a wear shoe FI126840B (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/SE2012/050390 WO2013154474A1 (en) 2012-04-12 2012-04-12 Wear shoe and method for producing a wear shoe

Publications (2)

Publication Number Publication Date
FI20145848A FI20145848A (en) 2014-09-29
FI126840B true FI126840B (en) 2017-06-15

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ID=49327927

Family Applications (1)

Application Number Title Priority Date Filing Date
FI20145848A FI126840B (en) 2012-04-12 2014-09-29 Wear shoe and process for manufacturing a wear shoe

Country Status (3)

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FI (1) FI126840B (en)
SE (1) SE540449C2 (en)
WO (1) WO2013154474A1 (en)

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
SE7812822A0 (en) * 1978-12-13 1980-06-14 Uddeholms Ab Trailers for snow plows
US4500766A (en) * 1982-02-04 1985-02-19 Paper, Calmenson & Co. Method of fusion of inserts to snow plow runners
US5129168A (en) * 1989-03-21 1992-07-14 Hedweld Engineering Pty. Limited Moon lock
US6854527B2 (en) * 2002-04-08 2005-02-15 Kennametal Inc. Fracture resistant carbide snowplow and grader blades
US7836615B2 (en) * 2007-04-25 2010-11-23 Winter Equipment Company Road machinery blade wear resistors

Also Published As

Publication number Publication date
SE540449C2 (en) 2018-09-18
FI20145848A (en) 2014-09-29
SE1451132A1 (en) 2014-09-25
WO2013154474A1 (en) 2013-10-17

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