Wear assembly for excavating digging edge

• US 7,451,558 B2
• Filed: 08/31/2005
• Issued: 11/18/2008
• Est. Priority Date: 04/30/2003
• Status: Active Grant

• Current Assignee: ESCO Group LLC (WEIR Group PLC)
• Original Assignee: ESCO Corporation (WEIR Group PLC)
• Inventors: Jones, Larren F.
• Primary Examiner(s): Beach; Thomas A
• Application Number:
  US11/216,697
• Publication Number:
  US 20050284006A1
• Time in Patent Office: 1,175 Days
• Field of Search: 374/46, 374/47, 37449-459, 172/772, 172/772.5, 172/753, 172/713, 403/378, 403/379
• US Class Current: 37/452
• CPC Class Codes: E02F 3/8152 Attachments therefor, e.g. wear resisting parts, cutting edges E02F3/8155, E02F3/8157 take precedence; teeth per se E02F9/28
• CPC Class Codes: E02F 9/2825 using adapters
• CPC Class Codes: E02F 9/2841 resilient
• CPC Class Codes: E02F 9/2858 characterised by shape
• CPC Class Codes: E02F 9/2883 Wear elements for buckets or implements in general
• CPC Class Codes: Y10T 403/7079 Transverse pin

Abstract

A wear assembly that includes a wear member and a boss to define an opening for receiving a lock forward of the front edge face of the lip which can mount the wear member in a stable and balanced manner without a through-hole in the lip. The wear member includes an aperture and a rib to define bearing faces on opposite sides of a central plane of the lip. The boss includes rails to hold the wear member in place, and a brace at the rear end, which supports the rails on the boss, abuts the rear of the wear member to reduce the loading on the lip, and deflects earthen material away from the wear member under reverse loading.

Claims

1. A lip of an excavating bucket having an interior scoop structure and an exterior surface, the lip comprising:

a base member having an inner face adapted to form a part of the interior scoop structure of the bucket, an outer face adapted to form a part of the exterior of the bucket, and a front edge face extending across the front of the base member and interconnecting the inner and outer faces, the front edge face including a recess; and

a boss fixed to the base member and including a front part extending generally along the front edge face, and a body extending rearwardly from the front part along one of the inner and outer faces of the base member, the boss defining a hole forward of the front edge face and in general alignment with the recess to receive a lock through the hole and the recess to secure a wear member to the lip, and the boss including a longitudinal coupling structure that slidably connects with a complementary coupling structure of a wear member to mount the wear member to the lip.

2. The lip in accordance with claim 1 in which the recess is defined by a concave wall having a length extending no more than about 180 degrees generally around an axis of the recess and extending generally perpendicular to the base member.

3. The lip in accordance with claim 2 wherein the concave wall of said recess has a generally continuous, uniform curvature.

4. The lip in accordance with claim 1 wherein the boss includes a generally rearward facing bearing surface in the hole to abut a lock holding the wear member to the lip.

5. The lip in accordance with claim 1 in which the base member includes a main member that extends across the expanse of the interior scoop structure and a corner member at each end of a main member, wherein each said corner member extends generally transverse to the main member, and wherein the main member and each said corner member includes a part of the front edge face that has at least one of the recesses and one of said bosses.

6. The lip in accordance with claim 1 wherein the longitudinal coupling structure is one part of a tongue and groove coupling structure.

7. A wear member for attachment to a lip of an excavating bucket, wherein the lip has a front edge, the wear member comprising a front working portion and a rear mounting portion, the rear mounting portion including a pair of legs that straddle the lip, one of the legs including one part of a tongue and groove coupling structure having a front end and a rear end, the coupling structure being adapted to slide rearwardly over the lip to engage a complementary formation on a base fixed the lip, each said leg including a bearing surface, said bearing surfaces facing in a forward direction and being generally aligned to engage a look to hold the wear member to the lip, and one said bearing surface being proximate the front end of the coupling structure.

8. The wear member in accordance with claim 7 wherein the coupling structure includes a pair of opposite rails.

9. The wear member in accordance with claim 8 wherein the rails and the respective leg collectively define a generally T-shaped configuration.

10. The wear member in accordance with claim 7 wherein the leg opposite the leg with the coupling structure includes an opening through which the lock is received.

11. The wear member in accordance with claim 10 wherein a rear wall of the opening defines one of the bearing surfaces.

12. The wear member in accordance with claim 11 wherein the leg with the coupling structure includes a rib extending generally toward the opening, and a front wall of the rib defines the other of the bearing surfaces.

13. A wear member for mounting on a digging edge of excavating equipment comprising:

a front working portion;

a rear mounting portion including a pair of rearwardly extending legs to straddle the digging edge, each of the legs having an inner surface facing the other leg, and a corner surface interconnecting the inner surfaces of the legs;

one part of a tongue and groove coupling structure formed along the inner surface of only a first one of the legs to couple to a complementary part of a tongue and groove coupling structure formed on a boss fixed to the digging edge;

an opening in a second one of the legs for receiving a lock, the opening having a forward facing bearing surface to contact the lock and hold the wear member to the digging edge; and

a cavity formed in the corner surface to receive a portion of the boss, the cavity having a pair of opposing sidewalls extending transverse to the inner surfaces to engage side surfaces of the boss for lateral support of the wear member.

14. The wear member in accordance with claim 13 which is a shroud wherein the working portion is a wearable tip that tapers to a free end.

15. The wear member in accordance with claim 13, wherein the corner surface has a generally uniform curved surface to abut a correspondingly curved front part of the boss fixed to the digging edge.

16. The wear member in accordance with claim 13 including a rear deflector face at a rear end that is inclined forwardly away from the lip to direct earthen material away from the wear member during reverse movement of the excavating equipment.