WO2022082253A1

WO2022082253A1 - Wear assembly

Info

Publication number: WO2022082253A1
Application number: PCT/AU2021/050975
Authority: WO
Inventors: Adam Scriven; Christopher David EDMONDS
Original assignee: Bradken Resources Pty Limited
Priority date: 2020-10-20
Filing date: 2021-08-25
Publication date: 2022-04-28

Abstract

Disclosed is a lock for securing a wear member to a support structure. The lock being arranged to be insertable within a locking hole in the wear member and comprising: a lock body extending along a lock axis and having a first end region for engaging with the support structure to allow securing of the wear member with the support structure; and a retainer arranged to engage with and apply a torsional resistance to the lock body. A wear member and wear assembly are also disclosed.

Description

WEAR ASSEMBLY

TECHNICAL FIELD

This disclosure relates to excavation wear assemblies, lock assemblies for use in such wear assemblies and to components of such excavation wear and lock assemblies. The disclosure has application in land based digging equipment and is herein described in that context. However, it is to be appreciated that the disclosure has broader application for example in waterborne excavation equipment such as dredgers, and is therefore not limited to that application.

BACKGROUND ART

Wear members are provided on the digging edge of various pieces of digging equipment such as the buckets of front end loaders. Each excavation wear assembly is formed of a number of parts, commonly a wear member, a support structure and a lock. The support structure is typically fitted to the excavation equipment and the wear member fits over the support system and is retained in place by the lock. In some instances, one or more intermediate parts may be also included between the wear member and the support structure. For ease of description it is to be understood that, unless the context requires otherwise, the term “support structure” used in this specification includes both the support structure arranged to be fitted to the excavation equipment or, if one or more intermediate parts are provided, to that intermediate part(s) or to the combination of the support structure and the intermediate part(s).

The reason that the excavation wear assembly is formed of a number of parts is to avoid having to discard the entire wear member when only parts of the wear member, in particular the ground engaging part of the excavation wear assembly (i.e. the wear member) is worn or broken. Various types of locks, wear members and support structures are known.

However, it is always desirable to design new excavation tooth assemblies and parts thereof.

It is to be understood that, if any prior art is referred to herein, such reference does not constitute an admission that the prior art forms a part of the common general knowledge in the art, in Australia or any other country.

SUMMARY

The present disclosure relates to improvements in relation to excavation wear assemblies, lock assemblies for use in such wear assemblies and to components of such excavation wear and lock assemblies adapted to engage with excavation equipment.

The present disclosure relates generally to locking assemblies and to excavation wear assemblies. In some embodiments, the wear member is secured to the support structure that is fixed to a bucket lip or other digging edge. The support structure may be part of an adapter or may be integrally formed to the digging edge. However, it is understood that embodiments of the present disclosure may be applied to excavation tooth assemblies in which the wear member is mounted to an intermediate member (which may also be referred to as a support structure or an adapter) that in turn is mounted to a nose that forms part of the digging edge or to the nose of a further support structure that is mounted to the digging edge. In the present disclosure, locking assemblies are used to secure the wear member to the support structure, however, the locking assemblies disclosed herein may also be used to secure any member that makes up the excavation wear assemblies to one another.

Disclosed is a lock for securing a wear member to a support structure, the wear member having a body that incorporates a cavity configured to receive the support structure, and a locking hole extending to the cavity, the lock being arranged to be insertable within the locking hole and comprising: a lock body extending along a lock axis and having a first end region for engaging with the support structure to allow securing of the wear member with the support structure; and a retainer arranged to engage with and apply a torsional resistance to the lock body.

In some forms, the locking hole extends from an exterior of the wear member to the cavity.

In some forms, the retainer comprises a body that is resiliently flexed when the lock body is engaged therein, so as to apply the torsional resistance to the lock body in use.

In some forms, the retainer body comprises at least one detent that is adapted on an exterior surface thereof, the detent being arranged in use to restrain a rotational movement of the retainer about the lock axis within the locking hole. In some forms, the at least one detent has a gradual curved transition on its outer profile.

In some forms, the retainer body at least partially encircles the lock body. In some forms, the retainer body is C-shaped having opposing arms that are able to flex relative to each other.

In some forms, the retainer body is annular. In some forms, the retainer body is comprised of a plurality of segments that are angularly spaced about the lock body.

In some forms, the retainer is manufactured so that the body of the retainer is formed having the required shape to provide the torsional resistance through engagement with the lock body. In other forms, the body of the retainer undergoes a post formation shaping process to adopt the required shape to provide the torsional resistance through engagement with the lock body.

In some forms, the lock body comprises a body region incorporating a first component of an engaging structure on an exterior surface thereof which is arranged to engage with a complementary component of the engaging structure disposed on an interior wall defining at least part of the locking hole.

In some forms, the engaging structure extends along a path that is helical, or part helical. In this way the lock may be axially advanced or retracted in the locking hole, whilst the engaging structures are engaged, by rotation of the lock body.

In some forms, the engaging structure is operative to resist movement of the lock in the wear member under loading in the direction of the lock axis.

In some forms, the arrangement to resist axial movement of the lock body under loading in the direction of the lock axis is through the combined operation of the retainer and the engaging structure, the retainer being operative to provide torsional resistance of the lock body in the locking hole and the engaging structure operative to inhibit axial movement of the lock body when the lock body is restrained from rotating in the locking hole.

In some forms, the retainer body incorporates the complementary component of the engaging structure on an interior surface thereof.

In some forms, the helical path or part helical path is closed at one end to forms a rotational stop to limit movement of the lock body in an axial direction.

In some forms, the body region terminates at a second end region of the lock body, the second end region including a drive arrangement to receive a tool to impart rotation to the lock body.

In some forms, the body region is generally cylindrical and the first component of the engaging structure is recessed into the body.

In some forms, the first end region tapers towards the first end of the lock body.

In some forms, where the wear member is formed from a casting, at least a portion of the retainer is formed as an insert that is cast into the wear member. Also disclosed is a wear member for attaching to a support structure of earth working equipment, the wear member comprising a body comprising a first end, an opposite second end that incorporates a cavity configured to receive the support structure, and a locking hole extending in the body to the cavity, the locking hole being arranged to receive a lock to secure the wear member to the support structure, the locking hole including retaining structure to receive a retainer within the locking hole.

In some forms, the retaining structure comprise a ledge that faces the cavity.

In some forms, the retaining structure comprises a ledge that faces towards the exterior of the wear member.

In some forms, the retaining structure comprises at least one abutment formation that is arranged in use to contact the retainer to prevent rotation of the retainer within the locking hole. In some forms, the abutment formation comprises at least one recessed region formed in the locking hole that is arranged to receive a complementary shaped portion of the retainer. In some forms, the recessed region forms a pocket in the locking hole intermediate the exterior of the wear member and the cavity.

In some forms, the abutment formation comprises at least one projection that forms an interruption to the wall of the locking hole.

In some forms, the wall defining the locking hole comprise a first component of at least one engaging structure arranged to engage with a complementary component disposed on the lock.

In one form, the at least one engaging structure resists movement of the lock in the wear member under loading in the direction of the hole axis. In some forms, the first component comprises one or more ribs that projects into the locking hole. In some forms, the first component is helical, or part helical.

In some forms, the pitch of the helical is relatively flat such that axial loading on the lock body is resisted solely by the engaging structure.

In some forms, the pitch of the helical arrangement is quite steep so that axial loading to the lock body promotes rotational and therefore axial drive to the lock body.

In some forms, the wear member is formed as a casting and at least a portion of the interior wall defining the locking hole, or a component disposed with that locking hole, is formed from an insert cast into the wear member.

In some forms, the component formed from the cast insert is the component of the at least one engaging structure. In one form, the cast insert may form at least part of a retainer that is arranged to engage with and apply a torsional resistance to a lock body of a lock locatable within the locking hole.

Also disclosed is a cast wear member for attaching to a support structure of earth working equipment, the wear member comprising a body comprising a first end, an opposite second end that incorporates a cavity configured to receive the support structure, and a locking hole extending through the body from an exterior of the wear member to the cavity, the locking hole being arranged to receive a lock to secure the wear member to the support structure, and a retainer defining at least a portion of the locking hole, wherein at least a portion of the retainer is formed from an insert cast into the wear member.

In this latter arrangement, at least a portion of the locking hole is defined by the retainer insert as the insert itself includes at least a portion of the interior wall that defines the locking hole with the wear member being in turn, cast around that insert. In some forms, the retainer may be multipart with one part or portion incorporated as a cast insert and another part or portion disposed in the resulting locking hole.

Also disclosed is a wear member assembly for attaching to a support structure of earth working equipment comprising: a wear member comprising a body having a first end, an opposite second end that incorporates a cavity configured to receive the support structure, and a locking hole extending in the body to the cavity; a lock for securing a wear member to a support structure and being arranged to be insertable within the locking hole, the lock comprising a lock body having a first end region for engaging with the support structure, and a retainer arranged to engage with, and apply a torsional resistance to, the lock body.

In some forms, the lock is further defined by any of the features recited in relation to the lock disclosed above.

In some forms, the wear member being further defined by any of the features recited in relation to the wear member disclosed above.

In some forms, the lock is pre-installed in the locking hole, and wherein the retainer is arranged to prevent inadvertent release of the lock body from the locking hole in transit.

In some forms, the lock is pre-installed in a transport position where the first end region is disposed within the locking hole such that the lock body does not prevent installation of the wear member onto the support structure.

In some forms, the lock is pre-installed in a transport position where the first end region projects from the locking hole such that the lock body is required to be retracted into the locking hole to allow installation of the wear member onto the support structure.

Also disclosed is a method of assembling a lock body to a wear member of earth working equipment, the method comprising: providing a retainer within, or defining, a locking hole of the wear member; and inserting a lock body into the locking hole and through the retainer, the retainer being arranged to resiliently deform to apply a torsional resistance to the lock body.

In some forms, the retainer is inserted within the locking hole prior to insertion of the lock body.

In some forms, the retainer is provided by being cast into the wear member.

In some forms, the method further comprising causing a component of an engaging structure formed on the lock body to engage with a complementary engaging structure disposed in the locking hole so as to form at least part of a retaining arrangement to resist movement of the lock in the wear member under loading in the direction of the lock axis.

In some forms, the retaining arrangement further comprises the retainer such that axial movement of the lock body under loading in the direction of the lock axis is restrained through the combined operation of the retainer and the engaging structure, the retainer being operative to provide torsional resistance of the lock body in the locking hole and the engaging structure operative to inhibit axial movement of the lock body when the lock body is restrained from rotating in the locking hole.

BRIEF DESCRIPTION OF THE DRAWINGS

Embodiments will now be described by way of example only, with reference to the accompanying drawings in which:

Fig. 1 is a perspective view of an excavation wear assembly including an embodiment of a locking assembly;

Fig. 2a is a sectional view of the excavation wear assembly of Fig. 1 mounted on a support structure with a locking pin in a retracted position; Fig. 2b is a sectional view of the excavation wear assembly of Fig. 1 mounted on a support structure with a locking pin in a locked position;

Fig. 3a is a perspective view of a locking pin for an embodiment of a locking assembly;

Fig. 3b is a perspective view of an embodiment of a locking assembly for an excavation wear assembly;

Fig. 3c is a perspective view of a retainer for an embodiment of a locking assembly;

Fig. 4 is a sectional plan view of a perspective of a locking assembly for an excavation wear assembly;

Fig. 5a is a perspective view of a second embodiment of a locking assembly for an excavation wear assembly;

Fig. 5b is a perspective view of a variation of the locking assembly of Fig. 5a;

Fig. 6 is a perspective view of a third embodiment of a locking assembly for an excavation wear assembly.

Fig. 7a is an exploded perspective view of a fourth embodiment of a locking assembly for an excavation wear assembly.

Fig. 7b is a perspective view of the fourth embodiment of a locking assembly for an excavation wear assembly, with the locking pin in in a retracted position.

Fig. 7c is a perspective view of the fourth embodiment of a locking assembly for an excavation wear assembly, with the locking pin in in an extended position.

Fig. 8a is a close-up perspective view of the locking hole of the fourth embodiment of a locking assembly for an excavation wear assembly.

Fig. 8b is a close-up perspective view of a variation of the locking hole of the fourth embodiment of a locking assembly for an excavation wear assembly. Fig. 9 is a close-up perspective view of the locking hole of the fourth embodiment of a locking assembly for an excavation wear assembly, with the locking pin in in an extended position.

Fig. 10 is a close-up section side view of the locking hole of the fourth embodiment of a locking assembly for an excavation wear assembly, with the locking pin in in an extended position.

Figs. Ila to 11c are plan and sectional views of variations of embodiments of the locking assembly with cast inserts.

DETAILED DESCRIPTION

In the following detailed description, reference is made to accompanying drawings which form a part of the detailed description. The illustrative embodiments described in the detailed description, depicted in the drawings and defined in the claims, are not intended to be limiting. Other embodiments may be utilised and other changes may be made without departing from the spirit or scope of the subject matter presented. It will be readily understood that the aspects of the present disclosure, as generally described herein and illustrated in the drawings can be arranged, substituted, combined, separated and designed in a wide variety of different configurations, all of which are contemplated in this disclosure.

The present disclosure relates generally to excavation wear assemblies for digging equipment. In some embodiments, an excavation wear assembly is shown comprising a wear member that is mounted to a nose portion of a support structure that is fixed to a bucket lip or other digging edge. The nose portion may be part of the support structure or may be integrally formed to the digging edge.

However, it is to be understood that embodiments of the present disclosure could be applied to excavation wear assemblies in which the wear member is mounted to an intermediate member (which may also be referred to as a support structure) that in turn is mounted to a nose that forms part of the digging edge or to the nose of a further tooth member that is mounted to the digging edge. In the excavation wear assemblies of the present disclosure, a lock is used to lock the wear member to the nose of the support structure or the nose integrally formed with the digging edge. Similarly, in excavation wear assemblies comprising an intermediate member, locks are used to lock the point to the intermediate member and the intermediate member to the nose formed with the digging edge or of the tooth member attached to the digging edge.

Referring to Figs. 1 and 2a and 2b, there is shown a wear assembly 10, comprising a wear member 12 mountable to a support structure 18, and a locking assembly 14. Referring specifically to Fig. 2a, the wear member 12 has a cavity or socket 16, and the support structure 18 has a nose portion 19. The lock assembly 14 includes a lock body shown in the form of a locking pin 20 and retainer 22. The locking pin 20 is inserted into a locking hole 24 formed in the wear member 12 and in one form, is disposed in place prior to mounting the wear member 12 to the support structure 18. In this way the wear member may be provided with the lock preinstalled. Various approaches to secure the lock to the wear member are disclosed below. The socket 16 of the wear member 12 is configured to receive the nose portion 19 of the support structure 18 when the wear member 12 and the support structure 18 are brought together as shown in Fig. 2a. In use, the support structure 18 is attached to a digging edge or lip of excavation equipment (not shown), and the wear member 12 includes the outer wear surface 33 and edge 21 which does the digging.

The locking hole 24 that extends through a wall of the wear member and is open at both ends thereof. The first end is adapted at an in-use outer surface 33 of wear member 12, whereas the second end of the locking hole 24 opens into an in-use inner surface that defines the socket 16. The locking assembly 14 is insertable within the locking hole 24 of the wear member 12 and, therethrough, into a recess 40 of the support structure 18 so as to secure the wear member 12 to the support structure 18. The locking pin 20 and the inner surface of the retainer 22 are each formed to have a substantially corresponding diameter such that the locking pin 20 can be engaged through an engaging structure 30 that is configured, in the embodiment shown, along the interior wall of the retainer 22 and on the surface of the locking pin body 27.

In use, in the illustrated form of Figs. 1 to 4, the retainer 22 is installed into the locking hole as a separate step to installation of the pin. In the embodiment of Figs. 1 to 4, the retainer 22 is able to be inserted from the outer surface 33 of the wear member and includes a lobe 46 that locates into a correspondingly shaped retainer cavity 25 that provides an abutment and forms a part of a retaining structure and that is inset along the interior facing walls from the in-use outer surface 33 and recessed into the wall of the locking hole 24 to form a pocket therein. The retainer 22 can be inserted through the aperture at the outer surface 33 of the wear member 12 (i.e. first distal end of the locking hole 24) with the lobe 46 extending in first, and then pivoted to locate into the retainer cavity 25 where after, the remaining part of the retainer can drop into the locking hole 24. A ledge, (not shown), which circumscribes at least a portion of the locking hole and faces towards the outer surface 33, forms a part of the retaining structure and is arranged to engage with the retainer to keep within the locking hole with the lobe engaged in the retaining cavity and in an orientation where the retainer is generally perpendicular to the axis of the locking hole. With this arrangement, the retainer 22 is stably supported in the locking hole and is prevented from rotating about the locking hole axis by interaction of the lobe 46 in the cavity 25. Whilst the retainer 22 is able to be easily removed from locking hole by a reverse pivoting action to the way it is installed, once the locking pin 20 is inserted via the outer surface 33, the pivoting action of the retainer is prevented, and thus the retainer and pin are fully captured within the wear member.

While the embodiment of Figs. 1 to 4 illustrates the retainer 22 as a single piece, it is to be appreciated that the retainer could be made from multiple pieces, or segments that are each locatable within the locking hole (in one form by having respective lobes that locate in one or more recessed section of the locking hole 24) that together function as the retainer 22. If formed from multi segments, these segments may have different material properties (such as elastic, or ability to compress) that could further refine the performance characteristics of the assembly.

The lock body 20 and retainer 22 can both be secured in place prior to the mounting of the wear member 12 to the support structure 18.

As best shown in Figs. 3a and 3c, the lock body 20 extends along a centrally aligned pin axis A-A and includes a first end 26 and a second end 28 that are spaced apart along the pin axis A-A by a pin body 27 that comprises one part 36 of the engaging structure 30 that interconnects the pin and retainer. The engaging structure 30 can be generally helical, i.e. a threaded arrangement such that the one part 36 extends at least partially along the length of the pin body 27. In this way the engaging structure can promote axial movement of the pin relative to the retainer under rotation of the lock body 20.

The pin body 27 is formed to taper frustoconically towards the first end 26. The first end 26 of the lock body 20 is thus configured to act as the leading end of the pin 20. This can improve the ease with which the lock body 20 is able to be inserted or removed from the locking hole 24 in general, and in particular the taper may improve the ability of the lock body 20 removal when the locking hole 24 contains some material fines that may ingress into the locking hole on operation of the excavating equipment.

The engaging structure 30 in the embodiment of Figs. 1 to 4, comprises the one part in the form of groove 36 that extends helically around the surface of the pin body 27, and that extends for at least part of the length of the lock body 20 between the first end 26 and a second end 28. In some forms, such as in Figs. 3a to 3c, the helical groove 36 wraps at least approximately 360°, i.e. one revolution, around the pin body 27 as it traverses from the second end 28 towards the first end 26. The retainer 22 is formed to comprise a helical ridge 38 that corresponds to the other part of the engaging structure 30 that engages with, the groove 36 of the helical arrangement 30 of the pin 20 (e.g. Figs. 3b and 3c). In some forms, the groove 36 is open at its opposite ends. Such that the engaging structures do not limit the extent of axial travel of the pin. However, in the illustrated form, and as best illustrated in Fig. 3, the upper end 37 of the groove is closed which provides a rotational stop and limits the travel of the pin into the wear member.

The engaging structure 30 enables the locking pin 20 to move axially into the locking hole 24, and relative to the wear member 12, when the pin 20 is rotated. In addition, the engaging structure 30 prevents axial separation and therefore enables the locking assembly to withstand loading that may be induced on the pin that could otherwise cause ejection of the pin from the locking hole. For example, in use a rotation force can be applied via the drive arrangement 32 that is configured at the second end 28 of the locking pin 20. The helical groove 36 engages with the ridge 38 of the retainer 22, causing the locking pin 20 to be axially displaced relative to the retainer 22 that is captively retained within the retainer cavity 25 of the wear member 12. The number of rotations that the locking pin 20 can be turned through within the locking hole 24 is defined by the length of the pitch. The pitch of the helical arrangement can be varied in order to vary the axial displacement. The helical threaded arrangement of the engaging structure 30 can thus be formed to have a pitch that corresponds with the desired axial displacement of the locking pin 20 within the locking hole 24 such that the pin 20 can be axially displaced to protrude from the locking hole 24 and extend into the recess 40 of the support structure 18.

The drive arrangement 32 can be formed as a hexagonal recess 34 or other shaped drive at the second end 28 of the locking pin 20. Using a correspondingly shaped tool inserted within the recess 34, an operator is thereby able to effect a rotational force on the locking pin 20, as required, so as to rotate and drive the locking pin 20 during installation or removal of the locking pin 20 from the locking hole 24. When the locking pin 20 is inserted into the locking hole 24, the drive arrangement 32 remains uncovered. This allows for easy access to the drive arrangement 32 when removal of the locking pin 20 from the locking hole 24 is desired. For example, when the wear member 12 needs to be replaced, the locking pin 20 can be removed by rotating the drive arrangement 32 in a direction that is opposite from the direction of rotation used when inserting the locking pin 20 until the locking pin 20 has reached a retracted position within the locking hole 24.

In general, the locking pin 20 is movable axially under continual rotation so that the pin is able to locate in different functional positions including a retracted position and an extended position as explained below.

As shown in Fig. 2a, in the retracted position the leading first end 26 of the locking pin 20 does not extend into the socket 16 of the wear member 12, or does not substantially protrude beyond an in-use inner surface 21 of the wear member 12, where the inner surface 21 is the side of the wear member 12 that locates adjacent to the support structure 18. In the retracted position, because the leading first end 26 of the locking pin does not extend into recess 40 of the support structure 18, the pin 20 is thus configured such that it does not impede the passage, movement, or removal of the wear member 12 from the support structure 18 being received within the wear member socket 16. Thus, when the locking pin 20 is in the retracted position the wear member 12 can be installed on, or removed from, the support structure 18.

In the extended or locked position, shown in Fig. 2b, the leading first end 26 of the pin 20 is arranged to extend into the recess 40 of the support structure 18. This can be achieved by rotating the pin 20 in a positive direction whereby the locking pin 20 moves axially until the locking pin 20 extends into the recess and secures the wear member 12 to the support structure 18. To revert the locking pin 20 to the retracted position, the pin 20 can be rotated in a reverse direction along the helical threaded arrangement of the engaging structure 30 whereby the locking pin 20 moves axially in the opposite direction, away from support structure 18 until the locking pin 20 no longer extends into, and is disengaged from, the recess 40. The first end 26 of the locking pin 20 includes a bearing surface 35 that is arranged to engage with the wall 52 of the recess 40. For example, the bearing surface 35 can comprise a threaded arrangement that is adapted to engage with a correspondingly threaded arrangement formed along the walls 52 of the recess 40. When in the extended position, the locking pin 20 can engage with the adjacent interior facing walls 52 that define the recess 40. The engagement between the locking pin 20 and interior facing walls 52 of the recess 40 is sufficient to retain the wear member 12 on the support structure 18.

The pin 20 is formed to have a frustoconical taper as the pin body 27 approaches the first end 26. This can improve the ease with which the pin 20 can be retracted from the wear member 12 and/or support structure 18 when surrounded by residue such as material fines. When the pin 20 is moved from the retracted position to the extended position, the taper on the leading first end 26 of the pin 20, in cooperation with the angle of the wall 52 of the recess 40, can pull together and align the locking hole 24 and the recess 40, whereby the wear member 12 is secured in position on the support structure 18.

The recess 40 is correspondingly shaped so as to receive the leading first end 26 of the locking pin 20. In use, when the wear member 12 is mounted to the support structure 18, each recess 40 can be aligned with a correspondingly spaced locking hole 24. For example, the wear member can comprise a plurality of locking holes that are each spaced apart so as to align and locate adjacent, in use, with a plurality of recesses on the support structure. In a further example, a support structure can be formed to comprise a plurality of recesses that are each spaced from one another so as to align with a single locking hole of a wear member, with a plurality of wear members being located adjacent one another so as to collectively sacrificially protect the support structure from damage during excavation. Variations of the size, shape and number of locking holes per wear member are contemplated, as would be appreciated by one skilled in the art. Similarly, variations of the size, shape and number of recesses per support structure are also contemplated, as would be appreciated by one skilled in the art. If required, the pin 20 may also be positioned in other functional positions other than the retracted or extended position. For example, it may be desirable to define a discrete transport position where the pin of the locking assembly installed on the wear member is located for transport to site. For example, whilst not shown, a transport position may be such that the leading first end 26 partially protrudes from the locking hole 24 so to extend and encroach into the socket 16 of the wear member 12. When the pin 20 is in the transport position, the locking pin 20 is configured to prevent the wear member 12 from being installed to the support structure 18. Instead, when an operator attempts to assemble the wear member 12 onto the support structure 18 there exists an interference fit therebetween preventing the installation. This would then necessitate the need for the pin to be “backed off’ to be installed. This may be achieved by unwinding the pin from the locking hole or by other means (such as through a cam action that causes the pin and or the locking assembly to lift)

In the embodiment of Figs. 1 to 4, The retainer 22 may be formed from a springlike or resiliently flexible material, such as spring steel, into a C-shaped spring collar. The retainer 22 comprises the lobe 46 that protrudes from the otherwise generally circular C-shape (see Figures 3b and 4). As described above, when the retainer 22 is inserted within the locking hole 24, the lobe 46 locates within the cavity 25 so as to align therein and captively retain the retainer 22 in the desired position and orientation within the locking hole 24, in use. The interaction between the lobe 46 and the enlarged portion 39 can prevent the retainer 22 from rotating within the cavity 25 when installed therein, for example, when a rotational force is applied via the locking pin 20 against the helical ridge 38 of the retainer 22.

The C-shaped spring clip includes two arms 42. The resiliently flexible material enables the two arms 42 to be biased towards a natural or rest position when deflected away therefrom. When the retainer 22 is located inside the cavity 25, the rest position of the two arms 42 provides that a gap 44 exists between each arm 42 and the in-use adjacent wall of the cavity 25. Furthermore, in the rest position of the retainer 22 the arms 42 are spaced from one another such that when a locking pin 20 is inserted therebetween, the arms 42 form an interference fit around the pin 20. In other words, in the resting position the substantially circular aperture formed by the arms 42 and body of the C-shaped clip has a smaller diameter than the diameter of the pin 20. In this way, the arms 42 of the spring clip 22 can partially block the locking hole 24 for the incoming locking pin 20. As the locking pin 20 is engaged between the arms 42 of the retainer 22, the arms 42 can be resiliently flexed outwards, with the inward bias of the arms 42 (counteracting the outward flex of the arm 42) applying a positive force against the locking pin 20. The positive force of the inward bias of the arms 42 against the locking pin 20 can generate a friction based torsional resistance that assists the retainer 22 in gripping and retaining the locking pin 20 in use. This torsional resistance can help reduce the effects of vibrations that may otherwise cause the locking pin 20 to rotate and come loose, or from moving axially towards the retracted position.

The C-shaped spring clip retainer 22 can thus resist rotation of the locking pin 20 within the locking hole 24 and also through the engaging structure, resists axial movement of the pin. As such, the retainer 22 acts to maintain the locking pin 20 in the desired configuration, in use.

When the locking pin 20 is installed into the C-shaped spring-clip retainer 22, the arms 42 of the retainer 22 block the entry of the locking pin 20 into the locking hole 24 until a force above the required threshold force is applied by the pin 20 to force the locking pin to engage the arms 42 and flex the arms 42 against their bias towards the natural position of the retainer 22. Subsequently, once the threshold force is reached, the pin 20 is able to ride past (or through) the arms 42 of the retainer 22 by flexing the arms 42 against their bias away from one another. As the arms 42 flex open, the each of the arms 42 respectively move into the adjacent gaps 44 and towards the interior facing walls of the locking hole 25. This movement occurs until the engaging structure 30 engages where after rotation of the pin is required to allow continued travel of the pin. This allows the pin 20 to move axially through the retainer 22 into the transport position or extended position, as required.

In use, as the helical groove 36 of the pin 20 rotates around the helical ridge 38 of the retainer 22, the inward bias of the arms 42 applies a radial pressure such that the pin 24 is resistant to the movement. Consequently, a corresponding torque needs to be applied to the drive arrangement 32 in order to rotate the pin 20 between the retracted position and the extended position. If the rotational force applied to the pin 20 is less than the resistance force generated by the interaction of the retainer arms 42 around the pin 20, the pin 20 is retained in the retracted or extended positions, or in any position therebetween.

The radial pressure applied to the retainer arms 42 can hold the pin 20 within the locking hole 24, even when the helical ridge 38 and groove 36 of the engaging structure 30 are not engaged. This can allow the wear member 12 to be positioned in an inverted orientation without the pin 20 falling from the locking hole 24 because of gravity.

In use, the resilient retainer may be specifically shaped to assume the desired position within its natural (unstressed) state. In this way it can simplify the manufacturing process as it avoids the need for a multi-step process (such as a post deforming step) to alter the shape of the retainer, or the need to add material (such as an inner liner) to assume that desired shape and performance characteristics.

Referring now to Fig. 2. The wear member 12 is shown in a received configuration on the support structure 18, with a locking assembly 14 inserted within the locking hole 24 of the wear member 12. The locking assembly 14 is configured in the retracted position. The wear member 12 and the support structure 18 both generally extend along a longitudinal assembly axis B-B. The locking hole 24 is formed to extend along a lateral axis C-C, that can be substantially perpendicular relative to the assembly axis within the locking hole 24. For example, the pin axis A- A can be colinear with the lateral axis of the locking hole 24, and both axis A-A, C-C can be perpendicular to the wear assembly axis B-B (see Fig. 1).

Figure 5a illustrates a second embodiment of a locking assembly 110 in accordance with the present disclosure. Similar reference numerals, but with the addition of the prefix” 1”, are used when referring to features that are the same unless described as being otherwise.

In the second embodiment, the retainer 122 is a nut that is fully enclosed, i.e. not an open C-shape. The enclosed retainer 122 can be formed to comprise a resilient material, for example a spring steel. When the enclosed retainer 122 is deflected, the resilient material is biased so as to substantially return the enclosed retainer 122 to its original shape.

In some forms, the enclosed retainer 122 can be formed to have a substantially circular ring shape, with a central hollow 137 that has a diameter smaller than the diameter of the locking pin 120. In-use, the central hollow 137 thus protrudes into the path of the locking pin 120 so as to provide an interference fit over the pin 120. The enclosed retainer 122 can therefore apply a pressure force against the locking pin 120 that restrict the rotation or free movement of the locking pin 120 through the locking hole 124, thereby improving the retention of the locking pin 120 within the locking hole 124.

In some forms, the central hollow 137 can be an ovular shape such that only a portion of the central hollow 137 forms an interference fit with the locking pin 120. The ovular shape, i.e. elliptical shape, has a major and minor axis, wherein the minor axis is smaller than the major axis. For example, the minor axis can be shaped to have a diameter smaller than the locking pin 120. As such, the central hollow 137 of the retainer 122 provides an interference fit when engaged by the locking pin 120. The interference can thus be isolated to the two regions of the central hollow 137 that locate proximal to the contact point between the minor axis and the locking pin 120. The two regions of the central hollow 137 that contact the locking pin 120 are biased towards one another as a result of the diametral interference and outward deflection caused by the engagement of the locking pin 120. In other words, the opposing sidewalls of the retainer 122 are spaced from one another such that when the retainer 122 is fitted to the locking pin 120, the opposing sidewalls are in interference with the pin 120. In this way, the two regions of the retainer 122 somewhat impede the passage of the pin 120 through the locking hole 124.

The inwardly facing wall of the central hollow 137 of the enclosed retainer 122 is helically threaded to correspond to, and engage with, the threaded arrangement of the engaging structure 130 adapted along at least a portion of the pin body 127.

In use, the enclosed retainer 122 is normally inserted into the locking hole 124 via the interior of the wear member. In an alternative form, the retainer may be resiliently flexed so as to be pass through the aperture at the outer surface 133 of the wear member 112 (i.e. first distal end of the locking hole 124) and into the locking hole 124. The enclosed retainer 122 is thus located within a correspondingly shaped retainer cavity 125 that is inset along the interior facing walls of the locking hole 124 from the in-use outer surface 133 and recessed into the circumference of the walls.

The retainer 122 can comprise at least one lobe 146 that projects from the external facing wall of the retainer 122 into correspondingly shaped niche 139 of the retainer cavity 125. The interaction between the at least one lobe 146 and the correspondingly shaped niche 139 forms an abutment and can assist with aligning the retainer within the cavity 125. The interaction can also assist with preventing the retainer 122 from rotating within the cavity 125 when installed therein, for example, when a rotational force is applied via the locking pin 120 against the enclosed retainer 122. In use, the retainer 122 is arranged to be inserted via the interior surface of the wear member (ie. within the socket) and locates against a ledge 147 which prevents the retainer 122 from being removed via the outer surface of the wear member. Fig 5b illustrates a variation on the retaining lobe 146 of the retainer 122 and correspondingly shape niche 139 in the wear member. In this arrangement, the retainer 122’ has opposite lobes 146’ that are generally tear shaped and locate in correspondingly shaped niches 139’. The retainer is located in place from within the cavity of the wear member 112. the more gradually curved design of the loads provides good stress flow through the retainer without high stress concentrations whilst resisting rotation of the retainer in the locking hole.

Figure 6 illustrates a third embodiment of the locking assembly 210. Similar reference numerals, but with the addition of the prefix “2”, are used when referring to features that are the same unless described as being otherwise.

In the third embodiment, the retainer 222 is fully enclosed in a manner similar to that described above with regards to the retainer 122 of the second embodiment. However, in the third embodiment the central hollow 227 of the retainer 222 is shaped to allow for a clearance fit around a locking pin 220.

The cavity 225 in the wear member 212 forms a stepped portion that is inset along a sidewall of the locking hole 224 of the wear member 212. The retainer 222 comprises an enlarged lobe 246 that projects laterally side-ways from an in-use outer surface 254 of the retainer 222, so as to form a step-like overhang that corresponds to the stepped portion of the cavity 225. In-use, the lobe 246 locates the retainer 222 in a stepped-relation over the cavity 225, whilst the base-portion 243 of the retainer 222 is received within a portion of the locking hole 224. The retainer 222, including the lobe 246 can be polygonally- shaped in cross-section, e.g. a rectangular prism, this can assist with preventing the retainer 222 from rotating within the locking hole 224 when installed therein. The interaction of the lobe 246 with the cavity 225 can further prevent the retainer 222 from rotating within the locking hole 224 and allows it to be captured within the locking hole. In addition, when the locking pin 220 is in the extended position in use, the overhang of the lobe 246 can be held in fixed relation against the cavity 225, thereby assisting with locking the wear member 212 to the support structure 218 in a fixed orientation and alignment.

The locking assembly 210 comprises a further retaining component in the form of a collar 223. The collar 223 comprises a female groove 245 at the in-use outer end 252 of the collar 223. In use, the correspondingly shaped male shoulder 229 of the locking pin 220 nests within the groove 245. The shoulder 229 of the locking pin 220 can be rotated within the female groove 245 about the longitudinal axis A-A of the locking pin 220, whilst being captively retained within the groove 245. Thus, when the locking pin 220 is rotated to move along the engaging structure 230, for example from a retracted position to an extended position, the locking pin 220 and collar 223 both move longitudinally along the longitudinal axis A-A together. For example, as the locking pin 220 is rotated from a retracted position towards the support structure 218, the collar 223 also moves towards the support structure 218. When the drive arrangement 232 of the locking pin 220 rotates the locking pin 220 to move it from a retracted position into the extended position, the collar 223 also moves from the retracted position to the extended position so as to engage with the recess of the support structure (not shown).

The engaging end 251 of the collar 223 is shaped to interlock with the retainer 222, like two adjacent puzzle pieces, with the collar 223 configured to slidably move in the longitudinal direction (i.e. along longitudinal axis A-A) relative to the retainer 222. The in-use outer end 252 of the collar 223 comprises a ledge 251 within which the groove 245 is formed. The ledge 251 protrudes from the main body of the collar 223 so as to wrap at least part of the way around the shoulder 229 of the locking pin 220, in use. In the extended position, the ledge 251 of the collar 223 rests on the in-use outer surface 254 of the retainer 222, with the ledge protruding to a length whereby they locate proximal to the sidewalls of the lobe 246.

The recess 240 within the support structure 218 is shaped so as to correspond to the cross-sectional profile of the combined collar 223 and retainer 222. In addition, the collar 223 is formed to have a depth that is at least as long as the length of the collar 223, whereby the engaging end 253 of the collar 223 can be extended therein in the extended position. In use, when the locking pin 220 is moved into the extended position, the engaging end 253 of the collar 223 slots within the recess 240 of the support structure 218 and assists with retaining the wear member 212 on the support structure 218.

In a variation, the semi-circular groove 245 of the collar 223 can be sized to have a diameter that is slightly smaller than the diameter of the shoulder 229 of the locking pin 220. The groove 245 of the collar 223 thus can create an interference fit against the shoulder 229 of the pin 220. The pressure applied to the pin 220 by the collar 223 can improve the retention of the locking pin 220 within the locking hole 224.

In a fourth embodiment, with reference to Figures 7 to 10, the retainer 422 is formed from a spring-like or resiliently flexible material, such as spring steel into a substantially C-shaped clip.

The wear member 412 comprises a ledge-like cavity 425 around the inwardly facing sidewalls of the locking hole 424, the cavity being substantially C-shaped so as to generally correspond to the shape of the retainer 422. The retainer 422 is sized so as to enable insertion into the cavity 425 from outside of the wear member 412 with the outer diameter of the retainer 422 fitting within the inner diameter of the cavity 425.

As best seen in Figure 8a, a shoulder 455 is formed on either side of a portion 456 of the sidewalls that juts inwardly towards the centre of the locking hole 424 from the circumference of the otherwise circular ledge-like cavity 425 to thereby provide an interruption to the cavity. Each shoulder 455 faces generally radially to an axis of the locking hole 424, and is adapted such that, in use, the distal ends of each of the two arms 442 of the C-shaped retainer 422 locate adjacent thereto, so as to abut and/or interact with one of the two shoulders 455 within the locking hole 424 (e.g. Fig 9). The interaction between the shoulder 455 and the distal ends of each of the two arms 442 of the C-shaped retainer 422 act to prevent the retainer 422 from rotating around within the cavity 425 in use.

The retainer 422 has an interference fit with the locking pin 420 as, in its natural state, the substantially circular aperture formed by the arms 442 and body of the C-shaped clip has a smaller diameter than the diameter of the pin 420. As the locking pin 420 is engaged between the arms 442 of the retainer 422, the arms 442 can be resiliently flexed outwards, with the inward bias of the arms 442 (towards their natural state) applying a positive force that clamps against the locking pin 20 and resists rotation of the pin by friction. The positive force of the inward bias of the arms 442 against the locking pin 420 can generate a friction based torsional resistance that assists the retainer 422 in gripping and retaining the locking pin 420 in use. This torsional resistance can help reduce the effects of vibrations that may otherwise cause the locking pin 420 to rotate and come loose, or from moving axially towards the retracted position. The frictional resistance is sufficient to prevent the locking pin 420 from coming undone during service. The frictional resistance can be overcome with a wrench applied by an operator during installation or removal of the locking pin 420.

The interior facing surface of the portion 456 that juts into the locking hole 424 comprises a helical thread therealong in the form of a ridge 438. The ridge 438 forms part of the engaging structure 30 and corresponds with, so as to engage with, the groove 436 of the helical arrangement 430 of the locking pin 420. This enables the locking pin 420 to be installed within the locking hole 420 and engaged at the ridge 438.

Accordingly, in the embodiment of the Figs. 7 to 10, the engaging structure 30 which resists axial movement of the pin 420 in the locking hole is formed directly between the pin and the wear member wall, whereas the retainer is arranged to provide solely torsional resistance to the pin. In use, the pin can operate in a manner consistent with the other embodiments disclosed with the pin being axially displaceable within the locking hole. In the form as shown in Fig. 8a, the pitch of the engaging structure as shown by the helical ridge 438 is relatively flat such that axial loading on the lock body is resisted solely by the engaging structure.

In an alternative arrangement as shown in Fig. 8b, the pitch of the helical ridge may be made quite steep so that axial loading to the lock body promotes rotational and therefore axial drive to the lock body. With this arrangement, the retainer 422 has a further function to assist in resisting axial movement of the lock body. In particular, loading in the direction of the lock axis which may occur during operation is resisted by the combined operation of the retainer 422 and the engaging structure 430; the retainer being operative to provide torsional resistance of the lock body in the locking hole and the engaging structure operative to inhibit axial movement of the lock body when the lock body is restrained from rotating in the locking hole. An advantage of this arrangement is that the control of the axial resistance can by more finally controlled between the degree of the pitch and the amount of torsional resistance provided. Also, the steeper pitch can limit the amount of rotation required to move between the retracted and locking position and be less prone to binding.

Fig. I la to Fig. 11c, shows variations on locking assemblies and/or wear member disclosed above. As the arrangements shares many of the features of the locking assemblies or wear members above, like features have been given like reference numerals except that the prefixed used has been replaced by a “5”.

In Fig 5a, the primary difference in the wear member 512 is that the interior shape of the locking hole 524 (in this case being the version shown in Figs. 7 to 10 above) is not formed directly in the wear member 512 but is provided as part of an insert 560 that is manufactured separately (say for example by an investment casting process) and is then placed within a mold (typically being a sand mold) and the wear member 512 is cast around the insert. The advantage of this arrangement is that the insert can be manufactured to a finer tolerance than generally possible under the sanding casting process usually employed in wear member manufacture. This in turn can assist in improving the performance of the resulting lock assembly incorporated in the lock receiving arrangement. Other advantages may include the ability to use different material for the insert as compared to the balance of the wear member 512 thereby allowing better control over performance and durability of the lock.

To ensure adequate performance, it is important that the insert 560 is adequately secured to the wear member 512. This may be achieved in a number of ways. In one form, the insert may be caused to fuse with the wear member as it is cast around the insert, such that the insert becomes intimately bonded with the wear member 512. With this arrangement the separation between the insert and the wear member is less distinct as there is not a clear material separation between the insert the cast wear member.

In another form, the insert may be mechanically keyed to the cast wear member as the liquid metal is able to flow around the exterior 562 of the insert 560. In Fig.

1 la, a recessed profile 564 is provided on the exterior 562 of the insert 560.

In a further form, the insert is secured by a combination of bonding (fusing) and mechanical arrangement. Further, whilst the insert has been shown in relation to selected embodiments disclosed above, it is to be appreciated that it may be used to define the locking hole of the wear member of the other embodiments disclosed.

In addition to ensure that the insert does not rotate, it has a non-circular crosssection (as best illustrated in the plan view).

In the embodiments shown in Figs. 1 lb and 11c, the retainer 522 itself is formed as a cast insert. In this form, the lock assembly is similar to the version disclosed above with reference to Figs 5a and 5b above. In the embodiment of Fig. 1 lb, the pitch of the helical engaging structure of the lock assembly 516’ is steep whereas in Fig. 11c a more conventional thread pitch is used with the inner profile of the thread non-circular to create the required torque resistance. Again, the inserts 560’, 560” have non-circular external profiles and also include mechanical profiling on the exterior wall 562’, 562” to mechanical key the insert into the wall of the wear member. Further, in the arrangements of Fig. 1 lb and 11c, the locking hole is defined by the retainer insert as the insert itself includes the locking hole with the wear member being in turn, cast around that insert.

In the claims which follow and in the preceding description of the invention, except where the context requires otherwise due to express language or necessary implication, the word “comprise” or variations such as “comprises” or “comprising” is used in an inclusive sense, i.e. to specify the presence of the stated features but not to preclude the presence or addition of further features in various embodiments of the invention.

Claims

1, A lock for securing a wear member to a support structure, the wear member having a body that incorporates a cavity configured to receive the support structure, and a locking hole extending from an exterior of the wear member to the cavity, the lock being arranged to be insertable within the locking hole and comprising: a lock body extending along a lock axis and having a first end region for engaging with the support structure to allow securing of the wear member with the support structure; and a retainer arranged to engage with and apply a torsional resistance to the lock body.

2. A lock according to claim 1, wherein the retainer comprises a body that is resiliently flexible when the lock body is engaged therein, so as to apply the torsional resistance to the lock body in use.

3> A lock according to claim 2, wherein the retainer body comprises at least one detent that is adapted on an exterior surface thereof, the detent being arranged in use to restrain a rotational movement of the retainer about the lock axis within the locking hole.

4. A lock according to either claims 2 or 3, wherein the at least one detent has a gradual curved transition on its outer profile.

5. A lock according to any one of claims 2 to 4, wherein the retainer body at least partially encircles the lock body.

6. A lock according to claim 5, wherein the retainer body is C-shaped having opposing arms that are able to flex relative to each other.

7. A lock according to claim 5 wherein the retainer body is annular.

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8. A lock according to any one of claims 5 to 7, wherein the retainer body is comprised of a plurality of segments that are angularly spaced about the lock body.

9. A lock according to any one of claims 2 to 8, wherein the body of the retainer is formed having the required shape to provide the torsional resistance through engagement with the lock body.

10. A lock according to any one of claims 2 to 8, wherein the body of the retainer undergoes a post formation shaping process to adopt the required shape to provide the torsional resistance through engagement with the lock body.

11. A lock according to any one of the preceding claims, wherein the lock body comprises a body region incorporating a first component of an engaging structure on an exterior surface thereof which is arranged to engage with a complementary component of the engaging structure disposed on an interior wall defining at least part of the locking hole, the engaging structure being operative to resist movement of the lock in the wear member under loading in the direction of the lock axis.

12. A lock according to claim 11, wherein the retainer body incorporates the complementary component of the engaging structure on an interior surface thereof.

13. A lock according to either claims 11 or 12, wherein the engaging structure extends along a path that is helical, or part helical.

14. A lock according to claim 13, wherein the helical path or part helical path is closed at one end to forms a rotational stop to limit movement of the lock body in an axial direction.

15. A lock according to any one of claims 11 to 14, wherein the body portion terminates at a second end region of the lock body, the second end region

30 including a drive arrangement to receive a tool to impart rotation to the lock body.

16. A lock according to any one of claims 11 to 15, wherein the body region is generally cylindrical and the first component of the engaging structure is recessed into the body.

17. A lock according to any one of the preceding claims, wherein the first end region tapers towards the first end of the lock body.

18. A lock according to any one of the preceding claims, wherein the wear member is formed from a casting, and at least a portion of the retainer is formed as an insert that is cast into the wear member.

19. A wear member for attaching to a support structure of earth working equipment, the wear member comprising a body comprising a first end, an opposite second end that incorporates a cavity configured to receive the support structure, and a locking hole extending through the body from an exterior of the wear member to the cavity, the locking hole being arranged to receive a lock to secure the wear member to the support structure, the locking hole including retaining structure to receive a retainer within the locking hole.

20. A wear member according to claim 19, wherein the retaining structure comprise a ledge that faces the cavity.

21. A wear member according to claim 20, wherein the retaining structure comprises a ledge that faces towards the exterior of the wear member.

22. A wear member according to any one of claims 19 to 20, wherein the retaining structure comprises at least one abutment formation that is arranged in use to contact the retainer to prevent rotation of the retainer within the locking hole.

23. A wear member according to claim 22, wherein the abutment formation comprises at least one recessed region formed in the locking hole that is arranged to receive a complementary shaped portion of the retainer.

24. A wear member according to claim 23, wherein the recessed region forms a pocket in the locking hole intermediate the exterior of the wear member and the cavity.

25. A wear member according to claim 22 or 23, wherein the abutment formation comprises at least one projection that forms an interruption to the wall of the locking hole. 6. A wear member according to any one of claims 19 to 25, wherein the wall defining the locking hole comprise a first component of at least one engaging structure arranged to engage with a complementary component disposed on the lock to resist movement of the lock in the wear member under loading in the direction of the hole axis.

27. A wear member according to claim 26, wherein the first component comprises one or more ribs that projects into the locking hole. 8. A wear member according to claim 26 or 27, wherein the first component is helical, or part helical.

29. A wear member according to any one of claims 19 to 28, wherein the wear member is formed as a casting and at least a portion of the retaining structure is formed from an insert cast into the wear member.

30. A cast wear member for attaching to a support structure of earth working equipment, the wear member comprising a body comprising a first end, an opposite second end that incorporates a cavity configured to receive the support structure, and a locking hole extending through the body from an exterior of the wear member to the cavity, the locking hole being arranged to receive a lock to secure the wear member to the support structure, and a retainer defining at least a portion of the locking hole, wherein at least a portion of the retainer is formed from an insert cast into the wear member. A wear member according to any one of claims 19 to 30, when dependent on claim 25, wherein at least a portion of first component is formed from an insert cast into the wear member. A wear member assembly for attaching to a support structure of earth working equipment comprising: a wear member comprising a body having a first end, an opposite second end that incorporates a cavity configured to receive the support structure, and a locking hole extending through the body from an exterior of the wear member to the cavity; a lock for securing a wear member to a support structure and being arranged to be insertable within the locking hole, the lock comprising a lock body having a first end region for engaging with the support structure, and a retainer arranged to engage with, and apply a torsional resistance to, the lock body. A wear member assembly according to claim 32, the lock being further defined by any of the features recited in relation to the lock of claims 1 to 18. A wear member assembly according to claim 32 or 33, the wear member being further defined by any of the features recited in relation to the wear member of any one of claims 19 to 31. A wear member assembly according to any one of claims 32 to 34, wherein the lock being pre-installed in the locking hole, and wherein the retainer is arranged to prevent inadvertent release of the lock body from the locking hole in transit.

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36. A wear member assembly according to claim 35, wherein the lock is preinstalled in a transport position where the first end region is disposed within the locking hole such that the lock body does not prevent installation of the wear member onto the support structure.

37. A wear member assembly according to claim 36, wherein the lock is preinstalled in a transport position where the first end region projects from the locking hole such that the lock body is required to be retracted into the locking hole to allow installation of the wear member onto the support structure.

38. A method of assembling a lock body to a wear member of earth working equipment, the method comprising: providing a retainer within, or defining, a locking hole of the wear member; and inserting a lock body into the locking hole and through the retainer, the retainer being arranged to resiliently deform to apply a torsional resistance to the lock body.

39. A method as claimed in claim 38, further comprising causing a component of an engaging structure formed on the lock body to engage with a complementary engaging structure disposed in the locking hole so as to form at least part of a retaining arrangement to resist movement of the lock in the wear member under loading in the direction of the lock axis.

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