AU2012203050B2

AU2012203050B2 - Wear Assembly

Info

Publication number: AU2012203050B2
Application number: AU2012203050A
Authority: AU
Inventors: Reece Attwood
Original assignee: Bradken Resources Pty Ltd
Current assignee: Bradken Resources Pty Ltd
Priority date: 2011-05-26
Filing date: 2012-05-24
Publication date: 2016-12-15
Anticipated expiration: 2032-05-24
Also published as: AU2012203050A1

Abstract

- 23 Abstract A wear assembly for assembly with a digging device in an assembled condition, the 5 wear assembly comprising: a base member having at least two base member portions, each base member portion configured to be at least partly disposed between a single wear member and the digging device when the wear assembly is in its assembled condition with the digging device. 3390469_1 (GHMatters) P87065.AU.I I Sz

Description

Wear Assembly

Technical Field

The disclosure relates to a wear assembly for a digging device, including parts thereof. The disclosure relates particularly to a base member and a base member assembly that is part of the wear assembly. The disclosure has application for land based digging devices and is herein described in that context. However, it is to be appreciated that the disclosure has broader application for example in waterborne digging devices such as dredgers, and is therefore not limited to that application.

Background

Excavating buckets or other digging devices or other excavating equipment are typically subject to harsh conditions. Excavating buckets are generally used in various digging and excavation operations. Digging devices typically experience large forces during digging and excavation operations.

Excavation teeth may be provided on the digging edge of the digging devices. Each excavation tooth is formed of a number of parts, commonly a point, an adapter and a lock. The adapter is typically fitted to the digging device and the point fits over the adapter and is retained in place by the lock. In some instances one or more intermediate parts may be also included between the point and the adapter.

The reason that the excavation tooth is formed of a number of parts is to avoid having to discard the entire tooth when only parts of the tooth, in particular the ground engaging part of the tooth (i.e. the point) is worn or broken.

On some digging devices, shrouds are also attached to the digging lip of the device to protect the digging lip edge from wear. Once worn, the shrouds can be removed and discarded and a new replacement shroud attached. This reduces the need to replace the whole device if the lip edge became worn, which would be much more costly than replacing just the shrouds. The shrouds typically comprise a base member that fits around a portion of the lip edge, a wear member that fits over the base member and a mechanical locking device for locking the wear member to the base member and thus to lip, but which also allows the wear member to be removed once worn. The shrouds may be disposed along the entire length of the lip edge or be disposed between excavation teeth that are attached to the lip.

Various types of shrouds and excavation teeth and their component parts are known. However, it is always desirable to design new shrouds, excavation teeth and parts thereof.

Throughout this specification, the term “wear assembly” is intended to include shrouds and excavation teeth, “wear members” include members that form part of shrouds or excavation teeth and “base members” include those members of the shrouds or excavation teeth that are attached to the digging device such as the adapter of an excavation tooth or the base member of a shroud.

With some wear assemblies (shrouds and excavation teeth), the base member is welded to the digging device. This typically involves applying weld between a surface of the digging device and one or more edge portions of the base member. One problem encountered with the welded on base members is cracking in the ends of the weld, which are sometimes referred to as the “toe ends”. Cracked base members need to be replaced or can fall off the digging device during operation, potentially causing the entire digging operation to stop or damage to the digging device or damage to the wear member or causing the wear member to fall off the digging device. This can be expensive to replace and fix.

The digging device and wear member can experience large loads on them during digging and excavation operations. These loads can cause either the wear member or some parts of the digging device, such as the lip to which the base member is welded, to flex. These loads are transmitted and bear onto the base member and can cause the base member to flex. The applicant has found that this loading on the base member causes large stresses to flow through the base member and the weld that attaches the base member to the digging device. These stresses become concentrated in the weld and in particular in the toe ends of the weld resulting in the cracking described above.

Summary of the Disclosure

In broad terms disclosed is one form of a wear assembly for assembly with a digging device in an assembled condition, the wear assembly comprising: a base member having at least two separate base member portions, each base member portion configured to be welded to the digging device such that each base member portion is at least partly disposed between a single wear member and the digging device when the wear assembly is in its assembled condition with the digging device, each base member portion comprising an engaging portion for a single lock to engage to lock the wear member to all of the base member portions.

In broad terms disclosed is another form of a wear assembly for assembly with a digging device in an assembled condition, the wear assembly comprising: a base member having at least two separate base member portions, each base member portion configured to be welded to the digging device such that each base member portion is able to move independently of the other base member portion(s) under forces due to flexing of the digging device, each base member portion comprising an engaging portion for a single lock to engage to lock the wear member to all of the base member portions.

In broad terms disclosed is a form of a base member assembly for assembly with a digging device in an assembled condition, the base member assembly associated with a single wear member and a single lock as part of a wear assembly, the base member assembly comprising: at least two separate base member portions configured to be welded to the digging device such each base member portion is able to move independently of the other base member portion(s) under forces due to flexing of the digging device, each base member portion comprising an engaging portion for the lock to engage to lock the wear member to all of the base member portions.

In broad terms disclosed is yet another form of a wear assembly for assembly with a digging device in an assembled condition, the wear assembly comprising: a base member configured to be disposed on the digging device when the wear assembled is in its assembled condition with the digging device, the base member comprising a body and a stress shielding portion provided in the body, the stress shielding portion configured to shield a part of the body from stresses that flow through the body in use.

In broad terms disclosed is a further form of a base member assembly for assembly with a digging device in an assembled condition, the base member comprising: a body; and a stress shielding portion provided in the body, the stress shielding portion configured to shield a part of the body from stresses that flow through the body in use. In broad terms there is also disclosed a wear assembly for assembly with a digging device in an assembled condition, the wear assembly comprising: a base member configured to be disposed on the digging device when the wear assembled is in its assembled condition with the digging device, the base member comprising a body that engages at least one surface of the digging device and having at least one edge portion for attachment to that surface of the digging device, and wherein the base member also comprises a discontinuity in the edge portion.

In broad terms there is also disclosed a base member assembly for assembly with a digging device in an assembled condition, the base member comprising: a body having at least one edge portion for attachment to a surface of the digging device; and a discontinuity in the edge portion.

In broad terms disclosed is a lip for an excavation bucket, the lip comprising at least one wear assembly in an assembled condition with the lip, the at least one wear assembly being a wear assembly as disclosed herein.

In broad terms disclosed is a method of retrofitting a base member assembly to a digging device, the method comprising removing the existing base member assembly from the digging device and installing the base member assembly as disclosed herein.

Brief Description of the Drawings

Embodiments of the disclosure will now be provided, by way of example only, with reference to:

Figure 1A is an exploded perspective perspective view of a wear assembly according to an embodiment of the present disclosure in an assembled condition with a digging device;

Figure 1B is a perspective view of a base member of the wear assembly of Figure 1A attached to the digging device;

Figure 1C is a top view of the base member of Figure 1B attached to the digging device;

Figure 1D is a front view of the base member of Figure 1B attached to the digging device;

Figure 1 Eis a bottom view of the base member of Figure 1B attached to the digging device;

Figure 2A is an exploded perspective perspective view of a wear assembly according to another embodiment of the present disclosure in an assembled condition with a digging device;

Figure 2B is a perspective view of a base member of the wear assembly of Figure 2A attached to the digging device;

Figure 2C is a top view of the base member of Figure 2B attached to the digging device;

Figure 2D is a front view of the base member of Figure 2B attached to the digging device; and

Figure 2E is a bottom view of the base member of Figure 2B attached to the digging device.

Detailed Description of Embodiments

Referring firstly to Figures 1A-1E, a wear assembly 20 attached to a digging device is shown, specifically to a lip 10 of an excavation bucket. The wear assembly 20 comprises a base member 11 that fits around and is attached to the digging edge 14 of the lip in an assembled condition with the digging device, a wear member 12 that fits over the base member 11 and hence also the digging device’s lip in an assembled condition with the digging device and a lock 13 that engages the wear member and the base member to lock the wear member in its assembled condition. The lock 13 can be disengaged from the base and wear members, allowing the wear member to be removed from the digging device and replaced once it is worn.

The wear member 12 is in the form of a shroud for protecting the digging edge 14 of the lip 10 and comprises a body 60 having top and bottom surfaces 61,62 that converge as they extend towards a forward digging edge 63 of the wear member. The wear member 12 also comprises opposed upper and lower legs 64, 65 that extend away from the body 10. The upper and lower legs 64, 65 of the wear member engage portions of the base member 11 when the wear assembly 20 is assembled into its assembled condition with the digging device such that the base member 11 is partly disposed between the lip 10 and the wear member 12.

It is noted that any references made to “upper”, “lower” etc. orientations of features of the wear assembly 20 are made for the purpose of describing the relative orientation of features of the embodiments shown in the Figures. It would be understood by a person skilled in the art that the features that are described as “upper”, “lower” etc could, in actual use, have different orientations.

Also, although the embodiments shown in the Figures and described below are in relation to a shroud that is attached to the lip of a bucket, features of these embodiments could be incorporated into other wear assemblies attached to other types of digging devices. For example the wear member could be the adaptor of an excavation tooth assembly that is attached to a digging device in the form of a dredging head or a bucket. Or the wear member could be the point of the excavation tooth assembly attached to a digging device via an adaptor of an excavation tooth assembly.

In this regard, it is noted that in the particular embodiments shown in Figures 1A-1E, the lip 10 of the wear assemblies 20 in the form of shrouds are disposed between excavation teeth, the adaptors 18 of which are shown integrally cast with the lip 10.

However, in other embodiments the adaptors could be welded or bolted or otherwise separately formed and attached to the lip.

The base member 11 comprises a first base member portion 22 and a second base member portion 23, that are separate from each other. Each base member portion 22, 23 has a maximum width that is less than 5%, preferably approximately 3%, of the width of the lip 10 to which the base member portions 22, 23 are attached. Although in the embodiment shown in Figures 1A-1E the base member 11 comprises two base member portions, it is to be understood that in other embodiments, the base member could comprise more than two base member portions. Because the base member portions 22, 23 are separate from each other, each base member portion is able to move and flex independently of the other base member portion under forces applied to the base member 11 due to the flexing of the digging device or wear member during digging or excavation operations. The advantages of this will be described in further detail below.

Both base member portions 22, 23 are configured to be at least partially disposed between the single wear member 12 of the wear assembly as shown in the Figures and the lip 10 of the digging device when the wear assembly 20 is in its assembled condition with the digging device. Also, each base member portion 22, 23 is positioned adjacent to the other base member portion in a side-by-side arrangement on the lip 10 of the digging device. In this position, the base member portions 22, 23 are spaced apart from each other. Although, it is noted that in other embodiments, the base member portions may be positioned so that a side of each base member portion butts against a side of the other base member portion. However, such an arrangement does not provide as great a freedom of independent movement for the base member portions.

The base member portions 22, 23 are substantially identical and are formed as “mirror images” of each other. This is so that, generally, the loads placed on the base member 11 are equally spread between the base member portions.

More specifically, each base member portion comprises a body 26 incorporating a first leg 24 and second leg 25. The bodies 26 of the base member portions 22, 23 are equidistantly spaced along a substantial part of the bodies, but are more greatly spaced apart between respective first and second legs. The legs 24, 25 of each base member portion are configured to overlay opposed surfaces 50, 51 respectively of the lip 10 of the digging device when the wear assembly is in the assembled condition with the digging device. Thus, the base member portions 22, 23 each wrap around the digging edge 14 of the lip 10 when the wear assembly 20 is assembled with the digging device. In this assembled condition, the first leg 24a of the first base member portion 22 extends substantially parallel to the first leg 24b of the second base member portion 23 Similarly, the second leg 25a of the first base member portion 22extends substantially parallel to to the first leg 25b of the second base member portion 23.

Each base member portion 22, 23 also comprises an engaging portion 27 for the lock 13to engage with. The lock engages with both of the engaging portions 27a,b to lock the wear member to both of the base member portions 22, 23. The engaging portion 27 of each base member portion 22, 23 is located at a side region of its respective base member portion 22, 23 that is adjacent to the other base member portion when the wear assembly is in its assembled condition. The engaging portion 27 of each base member portion 22, 23 is in the form of a raised portion projecting from a surface of the body of its respective base member portion 22, 23. The raised portions can have any suitable shape and dimensions. For example each raised portions can be a boss or a ramp or a lug or any other suitable portion.

Each base member portion 22, 23 further defines edge portions 29 in their respective legs 24, 25 which when the wear assembly 20 is being assembled are attached to respective opposed surfaces of the lip 10 so as to secure and fasten the base member portions 22, 23 to the lip. In particular, the edge portions 29 each receive solder or welding material to weld that edge portion and hence the base member portion to the surface of the lip 10. Each edge portion 29 extends around the periphery of its respective leg and is substantially U-shaped with a first end 30 and a second end 31. The weld material received at the ends 30, 31 of each edge portion is sometimes referred to as the “toe ends” of the weld, and are indicated by reference numeral 52.

As explained above, because the base member 11 comprises two separate base member portions 22, 23 each base member portion can flex independently of the other when loads are transferred to the base member either from the wear member 12 or the lip 10 during digging and excavation operations. It is noted that the majority of the loads on the base member portions are passed through the edge portions 29 resulting in stress concentration in the welds themselves and in particular the weld material 52 associated with the ends 30, 31 of each edge portion 29 of the base members. Without wishing to be bound by theory, the independent movement and flexing of each base member portion 22, 23 has been found to reduce this stress concentration in toe ends 52 of the welds (ie. the weld material associated with the ends 30, 31 of each edge portion of the base members) to be approximately halved relative to the stress concentration in the toe ends of welds which would be used to attach the base member if it was in the form of a single unitary member. The reduced stress concentration reduces the possibility of the weld edges from cracking and breaking and thus allows the base member to be used for longer.

Also, in the particular embodiment shown in Figures 2A-D, the two separate base member portions 22, 23 being spaced apart from each other also mitigates against forces being transmitted between the two base member portions. This is advantageous because as the digging device flexes, the base member portions 22, 23 flex independently of each other, thus reducing the possibility of all the stress from the flexing of the base member being concentrated in a small part of one of the welds, in particular in one of the toe ends 52 of the welds.

Although the embodiment shown in Figures 1A-1E and described above involves welding the base member portions 22, 23 to the lip 10 of the digging device, in other embodiments the base member portions 22, 23 may be attached to the lip by other mechanisms such as bolts for example or a combination of mechanisms such as a combination of bolts and welding. In such embodiments where the base member portions 22, 23 are bolted to the lip, the ability of the separate base member portions to move and flex independently under loads also advantageously reduces the stresses on the bolts (as compared to a single unitary base member). As a result this reduces the likelihood of fatigue failure of the bolts and the associated problems with such failures.

Referring now to Figures 2A-2E, a wear assembly 120 according to another embodiment is shown. Similar features of the wear assembly 120 to the wear assembly 20 of Figures 1A-1E have been provided with the same reference numbers but prefixed with the numeral 1.2A-2E

In the embodiments shown in Figures 2A-2E, the base member 111 comprises a single unitary base member but is provided with other additional features not shown in the embodiments of Figures 1 A-1 E. Flowever, in a variation, the base member 111 of Figures 2A-2E could comprise two or more base member portions as described above in relation to Figures 1 A-1 E with all the associated features and advantages thereof.

Returning to a description of the embodiment in Figures 2A-2E, the base member 111 comprises a body 126 incorporating first and second legs 124, 125. Each of the legs defines edge portions 129 which when the wear assembly 120 is being assembled are attached to respective opposed surfaces of the lip 110 so as to secure and fasten the base member 111 to the lip. The edge portions 129 are U-shaped with respective first and second ends 130, 131.

Notably, the base member 111 shown in Figures 2A-2E also comprises stress shielding portions 133 in opposing side regions of each of the first and second legs 124, 125. Although it is to be understood that the base member 111 could have more or less stress shielding portions and which could potentially be located elsewhere in the body 126 of the base member. Each stress shielding portion 133 is configured to shield one of the ends 130, 131 of the edge portions 129 of the body from stresses that flow through the body in use, in particular by directing any stresses that flow towards that shielding portion away from its respective edge portion end that the stress shielding portion is shielding. Thus, each stress shielding portion 133 is located proximate to one of the ends 130,131 of the edge portions 129.

Each stress shielding portion 133 is in the form of a slot 137 provided in the body 126 of the base member 111. Although each stress shielding portion may be in any suitable form of recess, cavity or cut-out portion in the base member body.

In the embodiment shown in Figures 2A-2E, the stress shielding portions 133 are substantially identical, but this may not be the case in other embodiments.

The slot of each stress shielding portion 133 has a curved portion 138. The curved portion 138 defines a smoothly curved surface 170 extending through the respective leg in which the stress shielding portion 133 is formed. The curved surface 170 transmits stress through the body of the base member at a tangent to that surface and prevents stress concentrating in the slot itself.The slot 137 opens through a side edge 139 of the base member 111, thus providing a discontinuity in the side edge 139. The slot 137 widens as the slot 137 extends into the body 126 of the base member 111 from the side edge 139 and away from a forward end of the base member body 126 that engages the digging edge 114 of the lip 110 when the base member 111 is assembled with the lip.

The stress shielding portions formed within the base member 111 advantageously allow forces to which the base member 111 is subjected in use to flow through the base and into the lip 110 of the digging device and away from the toe ends 152 of the welds that are associated with the ends 130, 131 of the edge portions 129 of the base member 111. As described above, the toe ends 152 of the welds are the weakest point of the wear member assembly and are most likely to crack under loading due to flexing of the digging device or the lip of the digging device or due to loads from the wear member during digging operations. The stress shielding portions 133 shield the ends 130, 131 of the edge portions 129 and hence the toe ends 152 of the welds from stress, deflecting stress away from the toe end 152 of the weld and into the lip 110 or wear member 112 through other parts of the base member 111 including other parts of the edge portions 129 of the base member. Also, the opening of each slot 137 is located below its respective edge portion end 130, 131 with which that stress shielding portion is associated, ie. between a forward end of the base member body 126 its respective edge portion end. Each opening is therefore also located ‘below’ its respective weld toe end 152. This also helps shield the edge portion ends 130, 131 and the weld toe ends 152 from stress by preventing stress from flowing around the bottom of the stress shielding portion 133 and into its associated edge portion end and weld toe end. Thus, the stress shielding portions reduce the likelihood of the toe ends 152 of the welds cracking.

It is noted that in other embodiments, the base member may be attached to the lip 110 of the digging device using bolts rather than or in combination with welding. In such embodiments, the stress shielding portions may be appropriately located in the base member to shield the bolts from stress so as to reduce the likelihood of the bolts failing.

It is to be understood that, unless indicated otherwise by express language or necessary implication, the wear assemblies including components thereof (wear members, locks and bosses) and methods of assembly according to any embodiment of one aspect of the disclosure may further encompass any one or combination of features described above in relation to embodiments of other aspects of the disclosure.

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

CLAIMS:

1. A wear assembly for assembly with a digging device in an assembled condition, the wear assembly comprising: a base member having at least two separate base member portions, each base member portion configured to be welded to the digging device such that each base member portion is at least partly disposed between a single wear member and the digging device when the wear assembly is in its assembled condition with the digging device, each base member portion comprising an engaging portion for a single lock to engage to lock the wear member to all of the base member portions.
2. A wear assembly for assembly with a digging device in an assembled condition, the wear assembly comprising: a base member having at least two separate base member portions, each base member portion configured to be welded to the digging device such that each base member portion is able to move independently of the other base member portion(s) under forces due to flexing of the digging device, each base member portion comprising an engaging portion for a single lock to engage to lock the wear member to all of the base member portions.
3. A wear assembly as claimed in claim 1 or 2, wherein the wear assembly also comprises a wear member associated with the base member.
4. A wear assembly as claimed in claim 3, wherein the wear member is configured to be received over at least part of each of the base member portions when the wear assembly is in its assembled condition with the digging device.
5. A wear assembly as claimed in any one of the preceding claims, wherein the base member has two base member portions which are substantially identical or mirror images of each other.
6. A wear assembly as claimed in any one of the preceding claims, wherein each of the base member portions is located adjacent another base member portion when the wear assembly is in the assembled condition with the digging device.
7. A wear assembly as claimed in any one of the preceding claims, wherein each of the base member portions are spaced from an adjacent base member portion(s) when the wear assembly is in the assembled condition with the digging device.
8. A wear assembly as claimed in any one of the preceding claims, wherein each base member portion comprises a body incorporating first and second legs, the legs configured to overlay opposed surfaces of the digging device when the wear assembly is in the assembled condition with the digging device.
9. A wear assembly as claimed in claim 8, wherein the first legs of each base member portion extend substantially parallel to one another when the wear assembly is in the assembled condition with the digging device and the second legs of each base member portion extend substantially parallel to one another when the wear assembly is in the assembled condition with the digging device.
10. A wear assembly as claimed in claim 8 or 9, wherein the body of each base member portion is equidistantly spaced from the body of an adjacent base member portion along at least part of the bodies when the wear assembly is in the assembled condition with the digging device.
11. A wear assembly as claimed in any one of the preceding claims, wherein the engaging portion of each base member portion is located at a side region of its respective base member portion that is adjacent to another base member portion when the wear assembly is in the assembled condition with the digging device.
12. A wear assembly as claimed in any one of the preceding claims, wherein the engaging portion of each base member portion comprises a raised portion on a surface of its respective base member portion.
13. A wear assembly as claimed in any one of the preceding claims, wherein each base member portion defines one or more edge portions that are welded to a surface of the digging device to attach that base member portion to the digging device.
14. A wear assembly as claimed in claim 13, wherein each base member portion comprises at least one stress shielding portion configured to shield at least one of the edge portions from stresses that flow through the body in use.
15. A wear assembly as claimed in claim 13 or 14, wherein each base member portion also comprises a discontinuity in one of the edge portions.
16. A wear assembly as claimed in any one of the preceding claims, wherein each base member portion has a maximum width that is less than 5% of the width of a lip of the digging device to which the base member portions are assembled in the assembled condition.
17. A base member assembly for assembly with a digging device in an assembled condition, the base member assembly associated with a single wear member and a single lock as part of a wear assembly, the base member assembly comprising: at least two separate base member portions configured to be welded to the digging device such each base member portion is able to move independently of the other base member portion(s) under forces due to flexing of the digging device, each base member portion comprising an engaging portion for the lock to engage to lock the wear member to all of the base member portions.
18. A base member assembly as claimed in claim 17, wherein the base member has two base member portions which are substantially identical or mirror images of each other.
19. A base assembly as claimed in claim 17 or 18, wherein each of the base member portions are located adjacent another base member portion when the base member assembly is in the assembled condition with the digging device.
20. A base member assembly as claimed in any one of claims 17-19, wherein each of the base member portions are spaced from an adjacent base member portion(s) when the base member assembly is in the assembled condition with the digging device.
21. A base member assembly as claimed in any one of claims 17-20, wherein each base member portion comprises a body incorporating first and second legs, the legs configured to overlay opposed surfaces of the digging device when the base member assembly is in the assembled condition with the digging device.
22. A base member assembly as claimed in claim 20 or 21, wherein the first legs of each base member portion extend substantially parallel to one another when the base member assembly is in the assembled condition with the digging device and the second legs of each base member portion extend substantially parallel to one another when the base member assembly is in the assembled condition with the digging device.
23. A base member assembly as claimed in any one of claims 20 - 22, wherein the body of each base member portion is equidistantly spaced from the body of an adjacent base member portion along at least part of the bodies when the base member assembly is in the assembled condition with the digging device.
24. A base member assembly as claimed in any one of claims 17-23, wherein the engaging portion of each base member portion is located at a side region of its respective base member portion that is adjacent to another base member portion when the base member assembly is in the assembled condition with the digging device.
25. A base member assembly as claimed in any one of claims 17-24, wherein the engaging portion of each base member portion comprises a raised portion on a surface of its respective base member portion.
26. A base member assembly as claimed in any one of claims 15-20, wherein each base member portion defines one or more edge portions that are welded to a surface of the digging device to attach that base member portion to the digging device.
27. A base member assembly as claimed in claim 26, wherein each base member portion comprises at least one stress shielding portion configured to shield at least one of the edge portions from stresses that flow through the body in use.
28. A base member assembly as claimed in 26 or 27, wherein each base member portion also comprises a discontinuity in one of the edge portions.
29. A base member assembly as claimed in any one of claims 17-28, wherein each base member portion has a maximum width that is less than 5% of the width of a lip of the digging device to which the base member portions are assembled in the assembled condition.
30. A wear assembly as claimed in any one of claims 1-16, the assembly also comprising a lock for engaging each engaging portion of the base member portions to lock the wear member to all of the base member portions.
31. A lip for an excavation bucket, the lip comprising at least one wear assembly in an assembled condition with the lip, the at least one wear assembly being a wear assembly as claimed in any one of claims 1-14.
32. A lip for an excavation bucket, the lip comprising at least one base member assembly in an assembled condition with the lip, the at least one base member assembly being a base member assembly as claimed in any one of claims 15-25.