(19)
(11)EP 3 086 630 B1

(12)EUROPEAN PATENT SPECIFICATION

(45)Mention of the grant of the patent:
15.04.2020 Bulletin 2020/16

(21)Application number: 14875086.2

(22)Date of filing:  11.12.2014
(51)International Patent Classification (IPC): 
A01B 15/06(2006.01)
E02F 9/28(2006.01)
A01B 23/02(2006.01)
(86)International application number:
PCT/NO2014/050233
(87)International publication number:
WO 2015/099539 (02.07.2015 Gazette  2015/26)

(54)

PROTECTION PLATE FOR WEARING PART ATTACHMENT ON A LEADING EDGE OF A WORKING TOOL

SCHUTZPLATTE FÜR VERSCHLEISSTEILBEFESTIGUNG AUF EINER VORDERKANTE EINES WERKZEUGS

PLAQUE DE PROTECTION POUR LA FIXATION D'UNE PIÈCE D'USURE SUR UN BORD D'ATTAQUE D'UN OUTIL DE TRAVAIL


(84)Designated Contracting States:
AL AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MK MT NL NO PL PT RO RS SE SI SK SM TR

(30)Priority: 27.12.2013 NO 20131742

(43)Date of publication of application:
02.11.2016 Bulletin 2016/44

(73)Proprietor: Kverneland Group Operations Norway AS
4355 Kvernaland (NO)

(72)Inventor:
  • SKJÆVELAND, Magne
    4353 Klepp St. (NO)

(74)Representative: Håmsø Patentbyrå AS 
P.O. Box 171
4301 Sandnes
4301 Sandnes (NO)


(56)References cited: : 
US-A- 2 987 838
US-A- 3 137 352
US-A- 5 075 986
US-A- 3 020 655
US-A- 4 317 300
US-A1- 2012 279 096
  
      
    Note: Within nine months from the publication of the mention of the grant of the European patent, any person may give notice to the European Patent Office of opposition to the European patent granted. Notice of opposition shall be filed in a written reasoned statement. It shall not be deemed to have been filed until the opposition fee has been paid. (Art. 99(1) European Patent Convention).


    Description


    [0001] The invention relates to a protective element for a wearing-part attachment for a wearing part for a leading edge of a working member of an earth-working implement, the wearing part and the wearing-part attachment being provided with complementary quick-coupling elements, and a leading side surface of the protection element including a wearing portion. Further, the invention relates to a method of wear-protecting a wearing-part attachment for a wearing part for a leading edge of a working member of an earth-working implement, the wearing part and the wearing-part attachment being provided with complementary quick-coupling elements.

    [0002] Earth-working implements, for example ploughs, harrows, excavator buckets and so on, are often provided with replaceable wearing parts in the form of wearing points, teeth and so on. To facilitate the replacement of such wearing parts, it is known to attach the wearing part to a wearing-part attachment by means of a quick-coupling. To have a desired effect of the quick-coupling system, it is obvious that the lifetime of the wearing-part attachment must be at least double the lifetime of the wearing part. In practice, it has turned out that extraordinary precautions must be taken at the wearing-part attachment to achieve the desired lifetime. The precautions may include applying a harder material, for example by hardfacing with a hard-metal coating or soldering with hard-metal elements, to the surface or surfaces of the wearing-part attachment that is/are subjected to the greatest wear, typically portions facing the material flow passing the wearing-part attachment.

    [0003] Welding or soldering involves the necessity of supplying a relatively large amount of heat energy to the wearing-part attachment for the wearing-part attachment to achieve the desired temperature so that a sufficiently good adherence is provided between the hard metal and the wearing-part attachment. It is known in the art that a great difference in mass between the elements that are to be joined is disadvantageous. For example, if the wearing-part attachment has been hardened prior to the application of hard metal, the supply of heat may take the hardening out of an unduly large portion of the wearing-part attachment. A similar problem is associated with treating the wearing-part attachment with other materials, for example carbon to carbidize a portion of the wearing-part attachment, or nitrogen to nitrate a portion of the wearing-part attachment.

    [0004] US3137352 A discloses a digging tool provided with a shank holding replaceable teeth on an earth digging machine in proper position. A protector for exposed surfaces of the shank is disclosed, which protector protects the shank against wear. The protector is made of sheet metal has an approximately U-shaped cross-section extending over the top and bottom surfaces of the end portion of the shank, embracing the shank. At least one of the top portion and the bottom portion is provided with a tab arranged for engagement with a dimple or an aperture in the shank.

    [0005] The invention has for its object to remedy or reduce at least one of the drawbacks of the prior art or at least provide a useful alternative to the prior art.

    [0006] The object is achieved through features, which are specified in the description below and in the claims that follow.

    [0007] An invention has been provided, in which a wearing-part attachment for a wearing part for a leading edge of an earth-working implement has been shielded by a separate protection element. The mass ratio of a wearing portion, with which a portion of the protection element is provided, to a supporting element of the protection element is favourable seen from a heat-economy point of view, as there is no supply of heat energy to the wearing-part attachment when the wearing portion is being attached.

    [0008] The protection element is arranged upstream of a leading portion of the wearing-part attachment, as an attachment portion of the protection element is arranged to engage with quick-coupling elements on the wearing-part attachment or the wearing part, typically in the form of guiding portions formed as projecting ridges on the attachment portion of the wearing part and arranged to lockingly engage with complementary grooves in the wearing-part attachment. When the wearing part has been fixed to the wearing-part attachment, the protection element will be held in position between the wearing part and the wearing-part attachment and rest supportedly against a leading end face of the wearing-part attachment.

    [0009] At least an upper portion of a leading side surface of the protection element is provided with a wearing portion, for example in the form of a hard metal, typically provided by a plate element, for example a carbide steel, having been attached to the leading side surface. It is conceivable for the wearing portion to be provided in a variety of ways. In its simplest form, a plate element from a carbide steel can be soldered or glued to the protection element, a ceramic plate element can be glued, a hard-metal coating can be vaporized, an upper portion of the protection element can be treated with a suitable gas, typically carbon for carbidizing or nitrogen for nitrating. Irrespective of the way chosen to achieve the desired effect, it is a relatively small element that is to go through a process for providing sufficient wear strength for the protection element that is to prevent wear on the relatively much larger wearing-part attachment.

    [0010] In a first aspect, the invention relates more specifically to a wearing part arrangement for a leading edge of a working member of an earth-working implement, the wearing part arrangement comprising a wearing part, a wearing-part attachment and a protection element, the protection element comprising

    a leading side surface including a wearing portion,

    an attachment portion configured to attach to the wearing part, wherein

    the protection element is configured to be arranged, by the engagement of the attachment portion with at least quick-coupling elements of the wearing part, to be held in position between the wearing part and the wearing-part attachment of the working member and rest supportedly against a leading end face of the wearing-part attachment, projecting above a plane coinciding with a top surface of the wearing-part attachment,

    the attachment portion having a sectional profile complementary to a cross section of the quick-coupling element of the wearing part, and

    the protection element is formed as a plate, in which the attachment portion is provided with notches and/or projecting portions complementary to a cross-sectional shape of the quick-coupling elements of the wearing part, characterized in that

    the wearing portion is arranged in an upper portion of the plate;

    the attachment portion is arranged in a lower portion of the plate; and

    the wearing portion is taken from a group consisting of a plate element fixed to the leading surface of the plate by soldering or gluing, a coating applied to the leading surface of the plate in vapour form and an upper plate portion with a molecular structure in which a hardness-increasing substance has been added.



    [0011] The plate element may be formed from carbide steel.

    [0012] The plate element may be formed from ceramics.

    [0013] In a second aspect, the invention relates more specifically to a method of wear-protecting a wearing-part attachment for a wearing part for a leading edge of a working member of an earth-working implement, the wearing part and the wearing-part attachment being provided with complementary quick-coupling elements, characterized by the method including the following steps:
    • providing a protection element comprising a leading side surface including a wearing portion, an attachment portion configured to attach to the wearing part, wherein the protection element is configured to be arranged, by the engagement of the attachment portion with at least quick-coupling elements of the wearing part, to be held in position between the wearing part and a wearing-part attachment of the working member and rest supportedly against a leading end face of the wearing-part attachment, projecting above a plane coinciding with a top surface of the wearing-part attachment, the attachment portion having a sectional profile complementary to a cross section of the quick-coupling element of the wearing part, and the protection element is formed as a plate, in which the attachment portion is provided with notches and/or projecting portions complementary to a cross-sectional shape of the quick-coupling elements of the wearing part, wherein the wearing portion is arranged in an upper portion of the plate; the attachment portion is arranged in a lower portion of the plate; and the wearing portion is taken from a group consisting of a plate element fixed to the leading surface of the plate by soldering or gluing, a coating applied to the leading surface of the plate in vapour form and an upper plate portion with a molecular structure in which a hardness-increasing substance has been added;
    • bringing the notches, projecting portions or combinations thereof of the attachment portion of the protection element into engagement between quick-coupling holders at a rear wearing-part portion of the wearing part, the attachment portion having a sectional profile complementary to the cross section of the quick-coupling element of the wearing part;
    • connecting the wearing part and the wearing-part attachment to each other by engagement of said quick-coupling elements; and
    • placing the protection element supportedly against a leading end face of the wearing-part attachment and so that it projects above a plane coinciding with a top surface of the wearing-part attachment.


    [0014] In what follows, an example of a preferred embodiment is described, which is visualized in the accompanying drawings, in which:
    Figure 1
    shows, in perspective, a leading portion of a working member, shown here as a cultivator tine, in which a leading end face of a wearing-part attachment is shielded by a protection element according to the invention;
    Figure 2
    shows a front view of the leading portion of the working member;
    Figure 3
    shows, on a larger scale, a longitudinal section III-III according to figure 2 through the leading portion of the working member; and
    Figure 4
    shows a cross section IV-IV according to figure 3 through the wearing part.


    [0015] In the figures, the reference numeral 1 indicates a leading portion of a working member, illustrated here as a cultivator tine, provided with a wearing part 11 arranged on a leading edge of the working member 1. The wearing part 11 is provided with a quick-coupling holder 111 including quick-coupling elements 112 (see figure 4 in particular), shown here as ridges forming guide portions for engagement with complementary coupling grooves 122 arranged on a wearing-part attachment 12 which is fixed to the working member with several fixing bolts 123. The wearing-part attachment 13 has a leading end face 121 facing in the working direction of the working member 1 and facing a rear portion 113 of the wearing part 11.

    [0016] A protection element 13 is arranged between the leading end face 121 of the wearing-part attachment 12 and the rear portion 113 of the wearing part 11. The protection element 13 is formed from a plate 130 forming a wearing portion 135 in an upper portion 133. In the figures, the wearing portion 135 is shown as a plate element 135' fixed to an upper portion 134 of a leading side surface 132 of the plate 130 in a suitable manner known to a person skilled in the art. If made from a metal, for example hard metal (carbide steel or the like), the plate element 135' may be fixed by means of soldering, or, if it is made from a non-metallic material, for example a ceramic material, be fixed by means of an adhesive. The protection element 13 extends higher up than a top surface 124 of the wearing-part attachment 12, so that the top surface 124 lies shielded behind the protection element 13.

    [0017] In an embodiment not shown, an upper plate portion 133 is coated with a hard metal, for example by vaporing or welding, or treated in such a way that a hardness-increasing substance is added to the molecular structure of the plate portion 133, for example by a supply of carbon in a carbidizing process or nitrogen in a nitrating process.

    [0018] A lower plate portion forms an attachment portion 131 with a sectional profile 136 complementary to the cross section of the quick-coupling element 112 of the wearing part 11, see figure 4 in particular.

    [0019] When the wearing part 11 is being attached to the wearing-part attachment 12, the protection element 13 is inserted between the quick-coupling holders 111 of the wearing part 11, so that the sectional profile 136 of the attachment portion 131 engages with the quick-coupling elements 112 of the wearing part 11. Then the wearing part 11 is connected to the wearing-part attachment 12, the protection element 13 then coming to lie in front of the leading end face 121 of the wearing-part attachment 12. In an operative state, the flow of loose mass, for example earth, will push the protection element 13 against the wearing-part attachment 12, and the wearing portion 135 retards the wear on the protection element 13 so that it maintains its protective effect on the wearing-part attachment 12.

    [0020] The effect has turned out to be surprisingly large, which testing of the protection element 13 provided with a wearing portion 135 only on part of the width of the protection element 13 has shown. While the portion of the top surface 124 that was protected by a plate element 135' showed insignificant wear, the portion of the top surface 124 that was not protected had worn down several millimetres in the course of a few days' use on a plough.


    Claims

    1. A wearing part arrangement for a leading edge of a working member (1) of an earth-working implement, the wearing part arrangement comprising a wearing part (11), a wearing-part attachment (12) and a protection element (13), the protection element (13) comprising

    a leading side surface (132) including a wearing portion (135),

    an attachment portion (131) configured to attach to the wearing part (11), wherein

    the protection element (13) is configured to be arranged, by the engagement of the attachment portion (131) with at least quick-coupling elements (112) of the wearing part (11), to be held in position between the wearing part (11) and the wearing-part attachment (12) of the working member (1) and rest supportedly against a leading end face (121) of the wearing-part attachment (12), projecting above a plane coinciding with a top surface (124) of the wearing-part attachment (12),

    the attachment portion (131) having a sectional profile (136) complementary to a cross section of the quick-coupling element (112) of the wearing part (11), and

    the protection element (13) is formed as a plate (130), in which the attachment portion (131) is provided with notches and/or projecting portions complementary to a cross-sectional shape of the quick-coupling elements (112) of the wearing part (11), characterized in that

    the wearing portion (135) is arranged in an upper portion (133) of the plate (130);

    the attachment portion (131) is arranged in a lower portion of the plate (130); and

    the wearing portion (135) is taken from a group consisting of a plate element (135') fixed to the leading surface (132) of the plate (130) by soldering or gluing, a coating applied to the leading surface (132) of the plate (130) in vapour form and an upper plate portion (134) with a hardness-increasing substance added to a molecular structure thereto.


     
    2. The device according to claim 1, wherein the plate element (135') is formed from carbide steel.
     
    3. The device according to claim 1, wherein the plate element (135') is formed from ceramics.
     
    4. A method of wear-protecting a wearing-part attachment (12) for a wearing part (11) for a leading edge of a working member (1) of an earth-working implement, the wearing part (11) and the wearing-part attachment (12) being provided with complementary quick-coupling elements (112, 122), characterized in that the method includes the following steps:

    - providing a protection element (13) comprising a leading side surface (132) including a wearing portion (135), an attachment portion (131) configured to attach to the wearing part (11), wherein the protection element (13) is configured to be arranged, by the engagement of the attachment portion (131) with at least quick-coupling elements (112) of the wearing part (11), to be held in position between the wearing part (11) and the wearing-part attachment (12) of the working member (1) and rest supportedly against a leading end face (121) of the wearing-part attachment (12), projecting above a plane coinciding with a top surface (124) of the wearing-part attachment (12), the attachment portion (131) having a sectional profile (136) complementary to a cross section of the quick-coupling elements (112) of the wearing part (11), and the protection element (13) is formed as a plate (130), in which the attachment portion (131) is provided with notches and/or projecting portions complementary to a cross-sectional shape of the quick-coupling elements (112) of the wearing part (11), wherein the wearing portion (135) is arranged in an upper portion (133) of the plate (130); the attachment portion (131) is arranged in a lower portion of the plate (130); and the wearing portion (135) is taken from a group consisting of a plate element (135') fixed to the leading surface (132) of the plate (130) by soldering or gluing, a coating applied to the leading surface (132) of the plate (130) in vapour form and an upper plate portion (134) with a hardness-increasing substance added to a molecular structure thereto;

    - bringing the notches, projecting portions or combinations thereof of the attachment portion (131) of the protection element (13) into engagement between quick-coupling holders (111) at a rear wearing-part portion (113) of the wearing part (11), the attachment portion (131) having a sectional profile (136) complementary to the cross section of the quick-coupling element (112) of the wearing part (11);

    - connecting the wearing part (11) and the wearing-part attachment (12) to each other by engagement of said quick-coupling elements (112, 122); and

    - placing the protection element (13) supportedly against a leading end face (121) of the wearing-part attachment (12) and so that it projects above a plane coinciding with a top surface (124) of the wearing-part attachment (12).


     


    Ansprüche

    1. Eine Verschleissteilanordnung für eine Vorderkante eines Arbeitsteils (1) eines Erdarbeitsgeräts, wobei die Verschleissteilanordnung ein Verschleissteil (11), eine Verschleissteilbefestigung (12) und ein Schutzelement (13) aufweist, wobei das Schutzelement (13)

    - eine vordere Seitenfläche (132), einschliesslich eines Verschleissbereichs (135), und

    - einen zur Befestigung am Verschleissteil (11) ausgestalteten Befestigungsbereich (131) aufweist, wobei das Schutzelement (13) ausgestaltet ist, derart angeordnet zu sein, um, mittels mindestens Schnellkopplungselementen (112) des Verschleissteils (11), zwischen dem Verschleissteil (11) und der Verschleissteilbefestigung (12) des Arbeitsteils (1) in Position gehalten zu werden, und stützend gegen eine vordere Endfläche (121) der Verschleissteilbefestigung (12) anlehnt, und über eine Ebene, welche sich mit einer Deckfläche (124) der Verschleissteilbefestigung (12) deckt, übersteht,

    - wobei der Befestigungsbereich (131) ein Querschnittsprofil (136) aufweist, welches komplementär zu einem Querschnitt des Schnellkopplungselements (112) des Verschleissteils (11) ist, und

    - wobei das Schutzelement (13) als eine Platte (130) geformt ist, in welcher der Befestigungsbereich (131) mit Kerben und/oder überstehenden Bereichen versehen ist, welche komplementär sind zu einer Querschnittsform der Schnellkopplungselemente (112) des Verschleissteils (11),

    dadurch gekennzeichnet,

    - dass der Verschleissbereich (135) in einem oberen Bereich (133) der Platte (130) angeordnet ist;

    - dass der Befestigungsbereich (131) in einem unteren Bereich der Platte (130) angeordnet ist; und

    - dass der Verschleissbereich (135) ausgewählt ist aus einer Gruppe bestehend aus einem Plattenelement (135'), welches durch Löten oder Kleben an der vorderen Fläche (132) der Platte (130) fixiert ist, aus einer Beschichtung, welche in Dampfform auf der vorderen Fläche (132) der Platte (130) aufgetragen ist, und aus einem oberen Plattenbereich (134) mit einer einer molekularen Struktur desselben zugefügten härteverstärkenden Substanz.


     
    2. Vorrichtung gemäss Anspruch 1, wobei das Plattenelement (135') aus Carbidstahl gebildet ist.
     
    3. Vorrichtung gemäss Anspruch 1, wobei das Plattenelement (135') aus Keramiken gebildet ist.
     
    4. Verfahren zum Schutz vor Verschleiss einer Verschleissteilbefestigung (12) für ein Verschleissteil (11) für eine Vorderkante eines Arbeitsteils (1) eines Erdarbeitsgeräts, wobei das Verschleissteil (11) und die Verschleissteilbefestigung (12) komplementäre Schnellkopplungselemente (112, 122) aufweisen, dadurch gekennzeichnet, dass das Verfahren die folgenden Schritte beinhaltet:

    - Bereitstellen eines Schutzelements (13), welches eine vordere Seitenfläche (132) aufweist, welche einen Verschleissbereich (135) aufweist, und einen Befestigungsbereich (131), welcher ausgestaltet ist, am Verschleissteil (11) befestigt zu werden, wobei das Schutzelement (13) ausgestaltet ist, derart angeordnet zu sein, um mittels mindestens Schnellkopplungselementen (112) des Verschleissteils (11), zwischen dem Verschleissteil (11) und der Verschleissteilbefestigung (12) des Arbeitsteils (1) in Position gehalten zu werden, und stützend gegen eine vordere Endfläche (121) der Verschleissteilbefestigung (12) anlehnt, und über eine Ebene, welche sich mit einer Deckfläche (124) der Verschleissteilbefestigung (12) deckt, übersteht, wobei der Befestigungsbereich (131) ein Querschnittsprofil (136) aufweist, welches komplementär zu einem Querschnitt der Schnellkopplungselemente (112) des Verschleissteils (11) ist, und wobei das Schutzelement (13) als eine Platte (130) geformt ist, in welcher der Befestigungsbereich (131) mit Kerben und/oder überstehenden Bereichen versehen ist, welche komplementär sind zu einer Querschnittsform der Schnellkopplungselemente (112) des Verschleissteils (11), wobei der Verschleissbereich (135) in einem oberen Bereich (133) der Platte (130) angeordnet ist; wobei der Befestigungsbereich (131) in einem unteren Bereich der Platte (130) angeordnet ist; und wobei der Verschleissbereich (135) ausgewählt ist aus einer Gruppe bestehend aus einem Plattenelement (135'), welches durch Löten oder Kleben an der vorderen Fläche (132) der Platte (130) fixiert ist, aus einer Beschichtung, welche in Dampfform auf der vorderen Fläche (132) der Platte (130) aufgetragen ist, und aus einem oberen Plattenbereich (134) mit einer einer molekularen Struktur desselben zugefügten härteverstärkenden Substanz;

    - In-Eingriff-Bringen der Kerben, der überstehenden Bereiche des Befestigungsbereichs (131) des Schutzelements (13) oder Kombinationen davon, zwischen Schnellkopplungshaltern (111) an einem hinteren Verschleissteilbereich (113) des Verschleissteils (11), wobei der Befestigungsbereich (131) ein Querschnittsprofil (136) aufweist, welches komplementär ist zum Querschnitt des Schnellkopplungselements (112) des Verschleissteils (11);

    - Verbinden des Verschleissteils (11) und der Verschleissteilbefestigung (12) miteinander durch Eingriff der besagten Schnellkopplungselemente (112, 122); und

    - Platzieren des Schutzelements (13) gegen eine vordere Endfläche (121) der Verschleissteilbefestigung (12) und sodass es über eine Ebene übersteht, welche sich mit einer Deckfläche (124) der Verschleissteilbefestigung (12) deckt.


     


    Revendications

    1. Un agencement de pièce d'usure pour un bord d'attaque d'un élément de travail (1) d'un outil de travail de terre, l'agencement de pièce d'usure (11) comprenant une pièce d'usure (11), une fixation (12) de pièce d'usure et un élément de protection (13), l'élément de protection (13) comprenant

    une surface d'attaque latérale (132) comprenant une partie d'usure (135),

    une partie de fixation (131) configurée pour être fixée à la pièce d'usure (11), dans lequel

    l'élément de protection (13) est configuré pour être agencé, par la mise en prise de la partie de fixation (131) avec au moins des éléments à couplage rapide (112) de la pièce d'usure (11), pour être maintenue en position entre la pièce d'usure (11) et la fixation (12) de pièce d'usure de l'élément de travail (1) et reposer de façon supportée contre une face d'attaque terminale (121) de la fixation (12) de pièce d'usure,

    la partie de fixation (131) ayant un profil en coupe (136) complémentaire (112, 122) à la section transversale de l'élément à couplage rapide (112) de la pièce d'usure (11), et

    l'élément de protection (13) étant formé en plaque (130), dans laquelle la partie de fixation (131) est pourvue d'encoches et / ou de parties saillantes complémentaires à la section transversale de l'élément à couplage rapide (112) de la pièce d'usure (11)

    caractérisé en ce que

    la partie d'usure (135) est agencée dans une partie supérieure (133) de la plaque (130),

    la partie de fixation (131) est agencée dans une partie inférieure (133) de la plaque (130), et

    la partie d'usure (135) est prise dans un groupe constitué d'un élément de plaque (135 ') fixé au bord d'attaque (132) de la plaque (130) par soudage ou collage, un revêtement étant appliqué sur le bord d'attaque (132) de la plaque (130) sous forme de vapeur et une partie de plaque supérieure (134) avec une substance augmentant la dureté ajoutée à une structure moléculaire de celle-ci.


     
    2. Le dispositif selon la revendication 1, dans lequel l'élément de plaque (135') est formé d'acier au carbure.
     
    3. Le dispositif selon la revendication 1, dans lequel l'élément de plaque (135') est formé de céramique.
     
    4. Un procédé de protection contre l'usure d'une fixation (12) de pièce d'usure pour une pièce d'usure (11) pour un bord d'attaque d'un élément de travail (1) d'un outil de travail de terre, la pièce d'usure (11) et la fixation (12) de pièce d'usure étant pourvues d'éléments à couplage rapide complémentaires (112, 122), caractérisé en ce que le procédé comprend les étapes suivantes:

    - prévoir un élément de protection (13) comprenant une surface d'attaque latérale (132) comprenant une partie d'usure (135), une partie de fixation (131) configurée pour être fixée à la pièce d'usure (11), dans lequel l'élément de protection (13) est configuré pour être agencé, par la mise en prise de la partie de fixation (131) avec au moins des éléments à couplage rapide (112) de la pièce d'usure (11), d'être maintenue en position entre la pièce d'usure (11) et la fixation (12) de pièce d'usure de l'élément de travail (1) et reposerde façon supportée contre une face d'attaque terminale (121) de la fixation (12) de pièce d'usure, projetant au-delà d'un plan coïncidant avec une surface supérieure (124) de la fixation (12) de pièce d'usure, la partie de fixation (131) ayant un profil en coupe (136) complémentaire (112, 122) à la section transversale de l'élément à couplage rapide (112) de la pièce d'usure (11), et l'élément de protection (13) étant formé en plaque (130), dans laquelle la partie de fixation (131) est pourvue d'encoches et / ou de parties saillantes complémentaires à la section transversale de l'élément à couplage rapide (112) de la pièce d'usure (11), dans lequel la partie d'usure (135) est agencée dans une partie supérieure (133) de la plaque (130), la partie de fixation (131) est agencée dans une partie inférieure de la plaque (130), et la partie d'usure (135) est prise dans un groupe constitué d'un élément de plaque (135') fixé au bord d'attaque (132) de la plaque (130) par soudage ou collage, un revêtement étant appliqué sur le bord d'attaque (132) de la plaque (130) sous forme de vapeur et une partie de plaque supérieure (134) avec une substance augmentant la dureté ajoutée à une structure moléculaire de celle-ci,

    - mettre en prise les encoches, parties saillantes ou combinaisons de celles-ci de la partie de fixation (131) de l'élément de protection (13) entre les éléments à couplage rapide (111) au niveau d'une partie arrière de pièce d'usure (113) de la pièce d'usure (11), la partie de fixation (131) ayant un profil en coupe (136) complémentaire à la section transversale de l'élément à couplage rapide (112) de la pièce d'usure (11);

    - connecter la pièce d'usure (11) et la fixation de pièce d'usure (12) l'une à l'autre par mise en prise desdits éléments à couplage rapide (112); et

    - poser l'élément de protection (13) de façon supportée contre une face d'attaque terminale (121) de la fixation (12) de pièce d'usure et de façon que celui-ci projette au-delà d'un plan coïncidant avec une surface supérieure (124) de la fixation (12) de pièce d'usure.


     




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    Cited references

    REFERENCES CITED IN THE DESCRIPTION



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    Patent documents cited in the description