AU743348B2 - Wear assembly for a digging edge of an excavator - Google Patents

Description

AUSTRALIA

Patents Act 1 990 P/00/01i1 28/5/91 Regulation 3.2 COMPLETE SPECIFICATION FOR A STANDARD PATENT

ORIGINAL

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0 00 S 0 *0*0 0*0 0* 0

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0 5 *0 0s@9 ~0 .5 0 0@ 0 0 06 @0*550

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S00 TO BE COMPLETED BY APPLICANT Name of Applicant: Actual Inventors: Address for Service: Invention Title: ESCO CORPORATION Larren F. Jones; Robert E. McClanahan; Hezekiah R. Holland CALLINAN LAWRIE, 711 High Street, Kew, Victoria 3101, Australia "WEAR ASSEMBLY FOR A DIGGING EDGE OF AN

EXCAVATOR"

The following statement is a full description of this invention, including the best method of performing it known to us:- 1- IP AUSTRALIA ;14

RECEIVED

0 4 DEC 1998

MELSOUR'"IE

I1 2/98ibl 0227.cs, 1 WEAR ASSEMBLY FOR A DIGGING EDGE OF AN EXCAVATOR Field of the Invention The present invention pertains to a wear assembly for the digging edge of excavating equipment, and in particular, to an adapter which is mechanically attached to such excavating equipment.

Background of the Invention Excavating teeth and other wear members have long been mounted along the digging edge of buckets and other excavating equipment to break up the ground and enhance the digging operation. As can be appreciated, the wear members used along the digging edge are often placed in harsh working conditions and are thus subjected to a high degree of wearing.

In order to minimize the size of the part needing frequent replacement, excavating teeth are ordinarily formed as a plurality of integrally connected parts.

An excavating tooth usually comprises an adapter, a point, and a lock pin for securing the point to the adapter. The adapter has a rear mounting end which is *9 configured for attachment to the digging edge of an excavator and a forwardly projecting nose for mounting the point. The point is a tapered member provided with a forward earth-penetrating end and a rearwardly opening socket adapted to .1 oo be received over the adapter nose. Although the points wear out more frequently, 2 the adapters are also subjected to wearing and periodic replacement. As can be appreciated, the adapters must not only be capable of being firmly secured to the excavator to prevent undesired loss of the tooth during use, but it is desirable that they also be capable of being readily removed and installed by operators in the @999 •9 S field.

A number of different approaches have been developed for securing wear l @o members, such as adapters, to the digging edge of a bucket. U.S. Patent No. 4,577,423 to Hahn provides an example of an adapter that is welded to the lip of a bucket. As to be expected, welding functions to securely attach the o adapter to the bucket. However, the replacement of welded adapters is typically performed at a shop rather than in the field. The time and difficulty required to remove and install such welded adapters has proven to be a significant deterrent.

-2 4/1 2/98jbl 0227.spe,2 U.S. Patent No. 4,267,653 to Hahn et al. describes an example of a mechanically attached adapter. As shown in this patent, mechanically attached adapters are frequently held to a bucket by the combination of a C-shaped clamp and a wedge. The wedge must be fit very tightly between the clamp and the adapter in order to securely hold the adapter to the bucket. Typically, the wedge is inserted into the assembly by repeated blows with a heavy sledge hammer. As can be appreciated, this is an onerous and time-consuming task for field workers, especially to achieve the final inch of movement needed to mount the assembly.

Further, the wedge even when tightly inserted often becomes loose under heavy loading, which thus risks loss of the tooth. Finally, these assemblies require a hole to be formed in the bucket lip, which reduces the lip's strength and integrity.

U.S. Patent No. 5,088,214 to Jones discloses another arrangement for mechanically attaching a wear member to the lip of a bucket. According to this construction, the wear member is matingly slipped over a T-shaped boss that has been welded to the bucket lip. A rigid locking block is fit within an opening defined in the top of the wear member to prevent undesired removal of the wear member from the lip. While this construction avoids the formation of a hole in the bucket lip, it is not suitable for use in attaching all types of wear members to any kind of 0*0 S bucket. For instance, larger buckets provided with beveled lips tend to generate 2.00 large forces on an adapter which could in some circumstances cause instability in 00 the mounting assembly. Further, the assembly lacks means for eliminating looseness that may exist between the wear member and the boss.

Summary of the Invention Opeg The wear assembly of the present invention enables the wear member to .02.5 be securely attached to the digging edge of an excavator without the need for 0: welding of the wear member or, in the preferred construction, forming a hole in the excavator's edge. Moreover, the assembly has sufficient stability to amply support adapters on a bucket lip formed with a beveled ramp. Nevertheless, despite the durability of the wear assembly, the wear members can still be easily removed or installed when replacement of the member becomes necessary.

In accordance with one aspect of the invention, a wear assembly includes a wear member which releasably attaches to a boss that is fixed to an excavator.

3- 4/1 2/98jb10227.spe.3 The wear member includes a leg which extends rearwardly over the front edge of the excavator. A T-shaped structure is formed along the inner side of the leg for attachment to the boss. The complementary T-shaped coupling structures of the wear member and the boss prevent dislodgement of the wear member under load.

The wear member also has front and rear bearing surfaces for resisting the applied loads during use.

In another aspect of the present invention, the boss is formed with a first surface which lies against the excavator and a second surface which forms a Tshaped coupling structure for receiving a wear member. The boss further includes a front bearing face for bracing the wear member and a rear bearing face for abutting a lock member to prevent removal of the wear member. In the preferred construction, a clamp section is formed along the first surface to wrap about the front digging edge of the excavator.

In accordance with another aspect of the invention, an opening for receiving a lock is formed through the leg of the wear member. The opening has a generally T-shaped configuration with a stem portion and a cross portion. The S stem portion extends longitudinally from the rear end of the leg to the lateral cross ees portion of the opening. The body of the lock sets between the rear end of the boss *000 and the rear wall of the cross portion in order to prevent removal of the wear member from the boss. An adjustment assembly extends through the body to l° 0 eliminate any looseness which may exist between the wear member and the boss.

In accordance with another aspect of the invention, a deflector can be S fixed to the excavator at a position behind the wear member. The removal of a S wear member from the boss can frequently be a difficult task due to the compaction of fines around the parts. However, a lock member with an adjustment S assembly can be easily used with a deflector to slide the wear member forwardly from the boss.

0°"0 Brief Description of the Invention Figure 1 is top plan view of a wear assembly in accordance with the present invention.

Figure 2 is a side elevational view of the wear assembly.

Figure 3 is a cross-sectional view taken along line 3-3 in Figure 2.

4/1 2/98jbl 0227.spe,4 Figure 4 is a perspective view of a boss in accordance with the present invention.

Figure 5 is a top plan view of the boss.

Figure 6 is a side elevational view of the boss.

Figure 7 is a cross-sectional view of the boss taken along line 7-7 in Figure 6.

Figure 8 is an rear elevational view of the boss.

Figure 9 is a top plan view of an adapter in accordance with the present invention.

Figure 10 is a side elevational view of the adapter.

Figure 11 is a cross-sectional view of the adapter taken along line 11-11 in Figure Figure 12 is an rear elevational view of the adapter.

Figure 13 is a top plan view of an alternative adapter in accordance with the present invention.

.o Figure 14 is a top plan view of a lock member in accordance with the o present invention.

Figure 15 is a side elevational view of the lock member.

Figure 16 is a rear elevational view of the lock member.

Figure 17 is a sectional view of an alternative lock member in accordance with the present invention.

Figure 18 is a rear elevational view of the lock member partially inserted into an adapter assembly in accordance with the present invention.

Figure 19 is a top plan view of another alternative adapter in accordance with the present invention.

6: Figure 20 is a side elevational view of the other alternative adapter on the digging edge of an excavator.

Figure 21 is a top plan view of a wear assembly in accordance with the present invention with the lock member positioned for effecting removal of the wear member.

5 4/12/98jb10227.spe,5 Detailed Description of the Invention The present invention pertains to a wear member, such as an adapter, which is mechanically attached to the digging edge of an excavator. While wear members in accordance with the present invention can be secured to a number of different excavators, the present application for illustration purposes discusses only the use of adapters secured to an excavating bucket. Further, operation of the equipment will cause the present wear assemblies to assume many different orientations. Nevertheless, for purposes of explanation, the components of the wear assemblies are at times described in regard to relative directions such as up and down. These directions should be understood with respect to the orientation of the wear assembly as shown in Figure 2, unless stated otherwise.

An adapter 10 in accordance with the present invention is particularly designed for attachment to the front lip 12 of a bucket 14 (Figure The lip includes an upper or inside surface 16, a lower or outside surface 17, a front edge face 18, and a beveled ramp 19 that interconnects inside surface 16 with front edge face 18. Adapter 10 is secured to lip 12 through the use of a boss 24 and a lock member 26.

Boss 24 is generally a J-shaped member with a pair of legs 28, 29 which wrap around the lip of bucket 14 (Figures Upper leg 28 has a body 32 and .QO a lateral flange 34 which together form a T-shaped structure along the top of the leg. The rear end of leg 28 forms a substantially flat, vertical wall 36 which functions to abut lock member 26 as discussed below; although wall 36 could have a concave or convex shape. The inner surface 38 of leg 28 includes a rear segment 40 which preferably lies against inside surface 16 and a front segment 2 41 which lies against beveled ramp 19. Nonetheless, in some circumstances, leg 28 may be fixed to the outside surface of the excavating equipment.

In the preferred construction, weld beads 44 are secured along at least portions of the rear and front segments 40, 41 to fixedly attach the boss to the bucket lip (Figure At least one hole 46 is preferably provided through upper leg 28 to define an additional area for welding the boss to the bucket (Figures 5 and A pair of holes 46a, 46b (or other arrangements) could alternatively be formed if desired. For illustration purposes, this arrangement of holes has been shown in 6- 4/1 2/98jbl 0227.spe,6 the perspective view of the boss (Figure Since the boss is substantially enveloped by the adapter, as described below, wearing of the boss is minimized.

As a result, the boss requires only infrequent replacement. Welding of the boss to the lip is therefore not a significant deterrent to the operators in the field, unlike the welding of adapters which need frequent replacement. Alternatively, the boss can be fixed to the lip of the bucket by other means, such as bolting or being integrally cast with the lip construction. Also, particularly with cast bosses, lower leg 29 can be omitted.

To form the T-shaped construction, body 32 of boss 24 is narrower than flange 34. The lower portion of leg 28, however, again widens at the front end of the boss to form with leg 29 a clamping section 48. In the preferred construction, the width of clamping section 48 has substantially the same width as adapter Clamping section 48 includes a top brace 49 and lower leg 29 intersected to form a generally V-shape configuration. The widened clamping section provides increased support for holding the boss to the bucket, and enhanced support in resisting loads imposed on the adapter. Further, lower leg 29 is short and positioned close to adapter 10 so as to limit the exposure and wearing of the member. Although not illustrated, lower leg 29 is in the preferred construction eg welded to outside surface 17. The front of boss 24 is shaped to define a bearing face 52 that matingly abuts adapter 10 as discussed below. Due to the connection of body 32 with flange 34 and with clamping section 48, bearing face 52 has a generally I-shaped configuration (Figure 4).

Adapter 10 includes a rearwardly extending leg 54 and a forwardly S projecting nose 56 (Figures 1-3 and 9-12). Nose 56 is preferably formed as Sdisclosed in U.S. Patent No. 4,965,945 to Emrich, which is hereby incorporated by reference. Nevertheless, many other nose structures could be used as desired.

In use, the socket defined in the point (not shown) is matingly received over the nose. In the illustrated embodiment, a lock pin (not shown) is passed along shoulder 57 to secure the point (not shown) to the adapter.

Adapter 10 includes only a single leg 54 which preferably extends along the inside surface of the bucket. Ordinarily, the outside leg of a typical bifurcated adapter experiences much more wearing than the inside leg. By eliminating the 7 4/1 2/98jb10227.spe,7 need for a leg along the outside of the bucket, the adapters of the present invention generally enjoy a longer usable life. Nonetheless, in come circumstances, leg 54 can be secured along the outside surface of the excavating equipment. Leg 54 has an inner surface 58 and an outer surface 59. A T-shaped slot 62 opens along the inner surface 58 to matingly engage with the T-shaped configuration defined along the top of boss 24 (Figures 3, 11, 12 and 18). To install adapter on a bucket, the adapter is slid rearwardly onto boss 24 such that slot 62 is received over and around flange 34. As an alternative, in certain circumstances, the T-shaped structures of the boss and the adapter may be formed as rail segments with spaced apart gaps therebetween as disclosed in U.S. Patent No.

5,241,765 to Jones et al., which is hereby incorporated by reference. As discussed in this patent, the use of segments enables the wear member to be installed and removed with minimum longitudinal sliding of the adapter along the boss.

As can be appreciated, flange 34 prevents movement of the adapter upward and away from inside surface 16 of bucket 14. While the marginal edges S 64 of inner surface 58 generally follow the contour of bucket lip 12, the marginal edges do not have any significant engagement with the lip. In the preferred construction, a gap 66 is formed between most of the marginal edges 64 of o*2V. adapter 10 and bucket 14 to permit sufficient space for the placement of weld beads 44.

A bearing face 68 is positioned at the front end of slot 62 to abut against bearing face 52 at the front of boss 24 (Figures 2 and 10). In the preferred construction, bearing faces 52, 68 are oriented to be substantially perpendicular 0:15.: to the axis 70 of nose 56. With this arrangement, the magnitude of the moment S: forces to be resisted by the bearing surfaces can be minimized. Nevertheless, the angular orientation of bearing surfaces 52, 68 could be varied considerably S depending upon the desired application. Further, bearing faces 52, 68 both preferably extend below nose 56 in order to better resist downwardly applied forces on the front of the point. Moreover, this downward extension of the bearing surfaces forms a front covering for clamp section 48 of boss 24 which, in turn, 8 4/1 2/98jb10 2 2 7 .spe,8 reduces wearing of the boss. Finally, though bearing faces 52, 68 are generally planar, they could also be concave or convex in shape.

An opening 76 is provided in leg 54 to extend from outer surface 59 to inner surface 58 and communicate with slot 62 (Figures 1 and Opening 76 is positioned near rear end 78 of leg 54, and rearward of rear bearing face 36 of boss 24 when adapter 10 is assembled on the boss. In the preferred embodiment, opening 76 has a generally T-shaped configuration which includes a stem portion 88 and a cross portion 89. The cross portion is defined by a pair of opposing front and rear walls 80, 81 and a pair of side walls 82, 83. Stem portion 88 extends longitudinally between cross portion 89 and rear wall 78. As discussed more fully below, stem portion 88 provides clearance for the adjustment assembly 92 of lock member 26. Front wall 80 of opening 76 also preferably includes a central recess 94 to provide clearance for the front of the adjustment assembly as needed.

One of the side walls 82 of the cross portion of opening 76 defines a keeper 96 to cooperate with a latch 98 for releasably retaining lock member 26 in :0.00 the opening (Figures 12 and 18). Keeper 96 is preferably formed by a tab 101 which overlies a recess 103 adapted to receive latch 98. The other side wall 83 of opening 76 has an arcuated configuration which conforms with the arc of a 4O@S circle to form a pivot support for inserting and removing the lock. Leg 54 includes a space 105 below side wall 83 for receiving one end 107 of lock member 26 as g.o 0 described below.

0 Lock member 26 functions to prevent adapter 10 from being slid axially off

S..

boss 24. Lock member 26 has a rigid block-shaped body 108 defined by a front wall 109, a rear wall 110, a first end wall 111, and a second end wall 112 (Figures 14-16). Body 108 of lock 26 is received into cross portion 89 of opening o 76 such that its front wall 109 opposes rear wall 36 of boss 24, and its rear wall 110 opposes rear wall 81 of adapter 10 (Figure This engagement structure °0oo S effectively prevents the adapter from being moved forwardly along the boss.

Lock member 26 further includes a latch 98 (Figures 14, 16 and 18). Latch 98 preferably includes a rigid tang 126 and an elastomeric member 128. Latch 98 is mounted within an opening 130 in end wall 111 such that tang 126 projects outward therefrom. To facilitate removal of the lock from opening 76, a groove -9- 4/12198jbl 0227.spe,9 131 is preferably defined in lock 26 along the top of end wall 111 to enable a tool a screw driver) to engage a shoulder 133 on tang 126 and retract latch 98 from keeper 96 (Figures 15 and 16). Second end wall 112 includes an arcuate depression 132 which is adapted to matingly engage the arcuated end wall 83, and enable lock member 26 to pivotally swing into and out of opening 76. When lock member 26 is inserted into opening 76 end portion 107 is fit into space 105 to provide a larger abutting area (Figure 18).

Lock 26 further includes an adjustment assembly 92 for eliminating any looseness that may exist between the adapter and the boss (Figures 14-16). In the preferred construction, adjustment assembly 92 includes a threaded bore 116 that extends through lock member 26 to receive a threaded plug 118. Plug 118 includes flats 122 on its rear end to facilitate engagement with a wrench or the like and a front bearing face 124. In use, plug 118 is advanced through bore 116 until bearing face 124 engages rear wall 36 of boss 24 and rear wall 110 of lock member 92 abuts rear wall 81 of opening 76. Plug 118 is preferably not tightened beyond engagement of the abutting walls to avoid unnecessary loading of the plug ,6 118. Moreover, since the plug is only loaded with compressive forces, the assembly has considerable durability and strength. As the adapter and boss wear, looseness may develop between the two parts. To eliminate this looseness, plug •2:U 118 is advanced forwardly until front face 124 of plug 118 again abuts rear wall 36 of boss 24 and rear wall 110 abuts rear wall 81 of opening 76.

Alternatively, plug 118 can be replaced with an adjustment assembly 92a which relies upon fluid pressure to eliminate any existing looseness in the assembly (Figure 17). More specifically, in this embodiment, lock member 26a .2b° includes a cylindrical cavity 134 in lieu of threaded bore 116. A piston 136 is Sslidably received in cavity 134 for movement toward and away from rear wall 36 o of boss 24. A retaining ring 138 is threadedly attached in cavity 134 to form a stop against which annular shoulder 140 of piston 136 engages upon maximum extension. A rear wall 142 closes the cavity on its rear end and supports grease fitting 144. Grease fitting 144 is preferably set in a recess 143 for protection.

Grease or other fluid is fed into cavity 134 to drive piston 136 forward. A coil -1 0 4/12/98jb1 0227.spe, spring 145 is received around piston 136 to retract the piston when the grease is drawn out of cavity 134.

The use of a lock member 26, 26a with an adjustment assembly 92, 92a can also be used with other adapter constructions. For instance, with repositioning of the grease fitting, lock 26a could be set in an opening of an adapter 10' without a stem portion (Figure 13). As another example, the wear assembly can include an adapter 170 and a boss 171 which attaches to a bucket 172 (Figures 19 and The bucket lip 174 includes generally parallel inside and outside surfaces 176, 177, and a rounded front edge 178.

Adapter 170 includes a pair of legs 182, 183 which extend along inside surface 176 and outside surface 177, respectively, and a nose 186 (Figures 19 and 20). Although nose 186 preferably has the same construction as nose 56 of adapter 10, it is shown with a nose in accordance with U.S. Patent No. RE33042, incorporated herein by reference, to illustrate that different noses can be used. Top leg 182 has a lower surface 189 that lies against inside surface 176 of lip 174. A *-T-shaped slot 191 opens in lower surface 189 to receive a complementary T- .shaped boss 171. The rear end of leg 182 includes an opening 195 which has the same construction as opening 76.

A deflector 201 (Figures 1-2 and 21) is preferably secured to inside surface 16 of bucket 14 (or alternatively bucket 172). Deflector 201 is preferably a U- *6 S shaped member provided with a forward bracing surface 203; although other structural members could be used. The deflector is used to ease the removal of adapter 10 in the field. In particular, lock 26 (or 26a) is removed from opening 76, reversed, and set within the gap 205 defined between rear end 78 of adapter and bracing surface 203 of deflector 201. The plug 118 is then advanced so that its bearing face 124 pushes against deflector 201 to move lock member 26 forwardly into engagement with rear end 78 of adapter 10. Continued advancement of plug 118 then functions to push adapter 10 from boss 24.

Alternatively, other expansion devices a turnbuckle) could be used with the deflector in lieu -of lock 26.

While use of a lock with an adjustment assembly is desired, it is not essential to the present invention. The adapters 1 0, 170 can be amply secured to -11 4/1 2/98jbl 0227.spe,11 boss 24, 171 by a rigid lock without an adjustment assembly (not shown) that simply prevents forward movement of the adapter. Under these conditions, the lock member and corresponding opening would be essentially the same as discussed in U.S. Patent No. 5,088,214 to Jones, which is hereby incorporated by reference. An example of such an adapter 10' is shown in Figure 13.

Nevertheless, a lock without an adjustment assembly could still be used in openings 76, 195.

The above-discussion concerns the preferred embodiments of the present invention. Various other embodiments as well as many changes and alterations may be made without departing from the spirit and broader aspects of the invention as defined in the claims.

Where the terms "comprise", "comprises", "comprised" or "comprising" are used in this specification, they are to be interpreted as specifying the presence of the stated features, integers, steps or components referred to, but not to preclude the presence or addition of one or more other feature, integer, step, component or group thereof.

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Claims (40)

1. A wear assembly for an excavator having a lip with a digging edge, the wear assembly comprising: a mount adapted to be fixed to an excavator lip, the mount including a first shoulder spaced from the lip and a first bearing surface; a wear member including a second shoulder that engages the first shoulder between the first shoulder and the lip to hold the wear member to the mount and prevent release of the wear member from the mount in a direction generally perpendicular to" the lip, and. an opening equipped with a second bearing surface, wherein the first and second bearing surfaces face in opposite directions when the first and second shoulders are engaged; and a lock received into the opening in the wear member between the first and second bearing surfaces to prevent disconnection of the first and second shoulders from each other and thereby retain the wear member on the mount, the lock having a first lock surface to oppose the first bearing surface, a second lock surface to oppose the second bearing surface, and an adjustment assembly selectively movable to vary the relative positions of the first and second bearing surfaces to thereby apply forces to the wear member and the mount that tend to tighten the mounting of the wear member on the mount.

2. A wear assembly in accordance with claim 1 wherein the mount includes a front structure that wraps around the digging edge of the lip.

3. A wear assembly in accordance with claim 1 wherein the lock includes a first part with an opening and a second part movably received in the opening, wherein one of the first and second bearing faces are defined on each of the first and second parts.

4. A wear assembly in accordance with claim 1 in which the lock includes a body with one wall that defines the first face and a threaded bore, and a threaded member threaded into the threaded bore, wherein the threaded member includes a wall that defines the second face.

5. A wear assembly, for an excavator having a lip with a digging edge, the wear assembly comprising: 02/10/01,td10227.clms, 13 -14- a mount adapted to be fixed to an excavator lip, the mount including a front structure with an inner surface that is bent and fixed along a face of the lip and the front of the digging edge, a rear structure having a first shoulder that extends generally away from the digging edge, and a bearing surface; a wear member including a second shoulder that engages the first shoulder to hold the wear member to the mount and prevent release of the wear member in a direction perpendicular to the extension of the first shoulder, and an opening; and a lock received into the opening in the wear member and in contact with the bearing surface of the mount to prevent disconnection of the first and second shoulders and thereby retain the wear member to the mount.

6. A wear assembly in accordance with claim 5 in which the bearing surface of the mount generally faces rearward to engage the lock, and the mount further includes a front support surface that abuts the wear member to 15 restrict rearward movement of the wear member.

7. A wear assembly in accordance with claim 6 in which the front support surface is arcuate.

8. A wear assembly in accordance with claim 5 in which the mount is a one-piece member. 20 9. A wear assembly in accordance with claim 5 in which the bearing It111= surface of the mount is formed at a rear end of the body structure.

10. A wear assembly in accordance with claim 5 in which the rear structure has a generally T-shaped coupling structure that includes the first shoulder.

11. A wear assembly in accordance with claim 10 in which the wear member has a generally T-shaped slot that includes the second shoulder, and the T-shaped coupling structure of the mount is received in the slot of the wear member.

12. A wear assembly in accordance with claim 5 in which the rear structure of the wear member includes a rearwardly extending leg that substantially overlies the mount, and the front structure wraps around the digging edge to define a second leg. 02/10/0 ,td10227.clms, 14

13. A wear assembly in accordance with claim 12 in which the wear member further includes a forwardly extending working portion.

14. A wear assembly in accordance with claim 13 in which the working portion is a nose for holding an excavating point.

15. A wear assembly in accordance with claim 5 further including a keeper to retain the lock in the opening.

16. A wear assembly in accordance with claim 15 in which the lock includes a retention portion movable between an operative position and a release position, wherein the retention portion in the operative position sets opposed to the keeper to retain the lock in opening.

17. A wear assembly in accordance with claim 5 in which the opening in the wear member includes a main portion and a stem portion, wherein the stem portion is narrower than the main portion. o 018. A wear assembly in accordance with claim 17 in which the stem portion opens in a rear surface of the wear member.

19. A wear assembly in accordance with claim 5 in which the lock includes a first face that abuts the bearing surface of the mount, a second face that abuts a wall of the opening in the wear member, and an adjustment assembly that the moves the first and second faces relative to each other to •20 tighten the fit of the lock between the wear member and the mount.

20. A wear assembly in accordance with claim 19 in which the lock further includes a main body and a movable plug, wherein one of the first and second faces is defined on each of the body and plug.

21. A wear assembly in accordance with claim 19 in which the adjustment assembly includes a threaded connection.

22. A wear assembly for an excavator having a lip with a digging edge, the wear assembly comprising: a mount adapted to be fixed to an excavator lip, the mount including a coupling structure having holding surfaces in opposed relation to the lip of the excavator, a bearing surface, and a front portion that wraps around the digging edge; 02/10/01,td10227.clms, -16- a wear member received over the mount and including retaining members that are received between the holding surfaces and the lip of the- excavator to retain the wear member to the mount in directions other than a longitudinal direction, and an opening; and a lock received into the opening in the wear member and in contact with the bearing surface of the mount to prevent disconnection of the first and second shoulders and thereby retain the wear member-to the mount.

23. A wear assembly in accordance with claim 22 in which the front portion of the mount further includes a front bearing surface that abuts the wear member to restrict movement of the wear member.

24. A wear assembly in accordance with claim 23 in which the front bearing surface is arcuate.

25. A wear assembly in accordance with claim 22 in which the mount is a one-piece member. S0015 26. A wear assembly in accordance with claim 22 in which the holding surfaces are part of a generally T-shaped coupling structure.

27. A wear assembly in accordance with claim 26 in which the wear member has a generally T-shaped slot that receives the T-shaped coupling coostructure. 20 28. A wear assembly in accordance with claim 22 in which the wear S member includes a keeper to retain the lock in the opening.

29. A wear assembly in accordance with claim 28 in which the lock includes a retention portion movable between an operative position and a release position, and the retention portion in the operative position sets opposed to the keeper to retain the lock in opening. A wear assembly in accordance with claim 22 in which the opening in the wear member includes a main portion and a stem portion, wherein the stem portion is narrower than the main portion.

31. A wear assembly in accordance with claim 22 in which the lock includes a first face that abuts the bearing surface of the mount, a second face that abuts a wall of the opening in the wear member, and an adjustment 02/10/01 ,td10227.clms. 16 -17- assembly that the moves the first and second faces relative to each other to tighten the fit of the lock between the wear member and the mount.

32. A wear assembly in accordance with claim 31 in which the lock further includes a main body and a movable plug, wherein one of the first and second faces is defined on each of the body and plug.

33. A wear assembly in accordance with claim 32 in which the plug is threadedly received in the main body.

34. A wear assembly for an excavator having a lip with a digging edge, the wear assembly comprising: a one-piece boss adapted to be fixed to an excavator lip, the boss including a front portion that wraps around the digging edge and forms a forwardly-facing bearing surface, a coupling structure with first shoulders extending away from the digging edge, and a rearwardly-facing bearing o surface; 0oo. a wear member received over the boss and including a coupling slot that engages with the coupling structure of the boss to permit only relative longitudinal movement between the wear member and the boss, an abutting surface to engage the forwardly-facing bearing face of the boss to limit rearward movement of the wear member relative to the boss, and an opening 20 passing through the wear member; and a lock received into the opening in the wear member and in contact with the rearwardly-facing bearing surface of the boss and a wall of the opening to prevent disconnection of the engaged slot and coupling structure. A wear assembly in accordance with claim 34 in which the lock includes a first and second bearing surface and an adjustment assembly selectively movable to vary the relative positions of the first and second bearing surfaces to eliminate looseness which may exist in mounting the wear member to the digging edge.

36. A wear assembly in accordance with claim 35 wherein the lock includes an adjustable plug that tightens the engaged of the wear member onto the excavator. 02/10/01,td 10227.clms, 17 -18-

37. A wear assembly in accordance with claim 36 wherein the plug is threadedly received into a corresponding bore in the lock.

38. A wear assembly in accordance with claim 34 in which the opening in the wear member includes a main portion and a stem portion, wherein the stem portion is narrower than the main portion and opens in a rear portion of the wear member.

39. A wear member for mounting to an excavator having a lip with a digging edge and at least one mounting structure fixed to the lip, the wear member comprising a longitudinal slot with internal shoulders for engaging the mounting structure to permit only relative longitudinal movement between the wear member and the mounting structure, an opening passing through the wear member for receiving a lock to prevent removal of the wear member i from the boss, the opening including a main portion and a stem portion, wherein the stem portion is narrower than the main portion and opens in a S. 15 rear portion of the wear member.

40. A wear member in accordance with claim 39 which further includes a rearwardly extending leg, a front working portion, and a rearwardly facing bearing surface generally between the front working portion and the leg for abutting the boss. 20 41. A wear member in accordance with claim 39 which further S includes a keeper cooperating with a lock mechanism for holding the lock in o the opening.

42. A one-piece boss for fixing to an excavator lip for mounting a wear member thereto, the boss including a body defining a coupling structure with shoulders extending rearwardly from the digging edge to engage with a complementary structure of a wear member, a front portion with an inner surface that is bent and adapted to be fixed along a face of the lip and the front of the digging edge, a forwardly facing first bearing surface to abut the wear member and resist rearwardly directed forces, and a rearwardly facing second bearing surface for contacting a lock securing the wear member to the boss. 02/10/01,td10227.clms, 18 -19-

43. A boss in accordance with claim 42 in which the first bearing surface is arcuate.

44. A boss in accordance with claim 42 in which the front portion wraps around the digging edge to define a leg opposite the body. A mount for fixing to an excavator lip for mounting a wear member thereto, the mount including a rear structure adapted to mount along a first side of the lip, the rear structure including a coupling structure with shoulders extending rearwardly from the digging edge to engage a complementary structure of a wear member and a rearwardly facing bearing face adapted to engage a lock holding the wear member to the mount, and a front structure adapted to engage an opposite side of the lip and the front of the digging edge, the front structure including at least one bearing surface adapted to abut the wear member and resist unwanted movement of the wear l ~member relative to the mount. 15 46. A mount for attaching a wear member to a lip of an excavator, the lip having an inside face and an outside face, the mount comprising a rear structure having a mounting surface adapted to be fixed to one of the faces of the lip, a longitudinally extending coupling structure with a pair of oppositely extending shoulders spaced from the one face of the lip and 20 adapted to mate with a complementary formation of the wear member, and a rearwardly facing bearing surface adapted to abut a lock and thereby hold the wear member to the mount, and co a front structure adapted to wrap around the digging edge and be attached to front portions of the inside face and the outside face, said front structure including at least one surface adapted to abut the wear member and resist unwanted movement of the wear member relative to the mount.

47. A lock adapted to be received into an opening in a wear member for securing the wear member to a boss fixed to a digging edge of an excavator, said lock comprising opposite front and rear bearing faces wherein the front face presses against the boss and the rear face presses against the wear member to maintain coupling of the wear member to the boss, an /<bA--djustment assembly for selectively varying the relative positions of the front 02/10/01,td10227.clms, 19 and rear bearing faces, and a projection to cooperate with a keeper structure to hold the lock in the opening in the wear member.

48. A lock in accordance with claim 47 further including a first part with a hole and a second part movably received in the hole, wherein one of the first and second bearing faces are defined on each of the first and second parts.

49. A lock in accordance with claim 48 in which the hole and the second part are threadedly engaged with each other. Dated this 2n d day of October, 2001. ESCO CORPORATION By their Patent Attorneys: CALLINAN LAWRIE o* go 02/10/01,td10227.clms,20