Wear assembly for excavating machines

• US 8,024,874 B2
• Filed: 08/28/2006
• Issued: 09/27/2011
• Est. Priority Date: 08/30/2005
• Status: Active Grant

• Current Assignee: ESCO Group LLC (WEIR Group PLC)
• Original Assignee: ESCO Corporation (WEIR Group PLC)
• Inventors: McClanahan, Robert, Stitzel, Adam
• Primary Examiner(s): Will; Thomas
• Assistant Examiner(s): NGUYEN, MAI T
• Application Number:
  US11/511,634
• Publication Number:
  US 20070044349A1
• Time in Patent Office: 1,856 Days
• Field of Search: 374/46, 374/50, 37452-456
• US Class Current: 37/452
• CPC Class Codes: E02F 9/28 Small metalwork for digging elements, e.g. teeth scraper bits ploughs for agriculture A01B15/00; teeth of harrows A01B23/02
• CPC Class Codes: E02F 9/2883 Wear elements for buckets or implements in general

Abstract

A wear member that includes a pair of legs defining a slot straddles the digging edge of a piece of excavating equipment. In one construction, the slot is formed at its front end with a pair of inclined surfaces and a laterally extending ridge that is fit within a complementary channel on the digging edge. A lock is received within an opening in the wear member to releasably secure the wear member to the digging edge.

Claims

1. A wear member for protecting a digging edge of an excavating bucket, the wear member comprising:

a front portion adapted to contact abrasive materials during digging by the excavating bucket;

a pair of rearwardly extending legs that define a cavity therebetween to receive the digging edge, the cavity being open at a rear end to receive the digging edge and having a front end that dips downward relative to the rear end and is closed by a rearward facing abutting surface defining a front abutting surface, the front end being defined by an upper surface, a lower surface, and the front abutting surface that extends between the upper and lower surfaces, the upper surface, the lower surface and the front abutting surface each overlying and bearing against corresponding walls of the digging edge to resist loads applied during digging, the upper and lower surfaces being inclined in the same general direction relative to a central plane of the digging edge, the lower surface generally facing toward the front abutting surface, and the cavity being laterally open rearward of the front end to accommodate a wider lateral extension of the digging edge beyond the legs; and

an opening for receiving a lock to hold the wear member to the digging edge.

2. A wear member in accordance with claim 1 wherein the upper and lower surfaces are generally parallel to each other.

3. A wear member in accordance with claim 1 in which a support projects into the cavity to fit within a complementary recess defined in the digging edge, wherein the support is partially defined by one of the upper and lower inclined surfaces.

4. A wear member in accordance with claim 3 wherein the support is a ridge that extends laterally across the cavity.

5. A wear member in accordance with claim 1 in which the opening for the lock includes a front wall and a rear wall, wherein the rear wall extends farther into the cavity than the front wall.

6. A wear member in accordance with claim 1 wherein the abutting surface is concave and curved about two perpendicular axes.

7. A wear member in accordance with claim 6 wherein the abutting surface has a center and the lower surface is at an acute angle to a plane extending tangential to the center of the abutting surface.

8. A wear member in accordance with claim 1 which is a shroud.

9. A wear member in accordance with claim 1 wherein the cavity is asymmetric in vertical cross section.

10. A wear member in accordance with claim 1 wherein the opening for receiving the lock is provided in only one of the legs.

11. A wear member for protecting a digging edge of an excavating bucket, the wear member comprising:

a front portion adapted to contact abrasive materials during digging by the excavating bucket;

a pair of legs extending rearward from the front portion;

a cavity defined between the legs to receive the digging edge, the cavity being open at a rear end to receive the digging edge and having a front end that dips downward relative to the rear end and is closed by a front abutting surface, the front end being defined by the front abutting surface, a top face and a bottom face, the cavity being laterally open rearward of the front end to accommodate a lateral extension of the digging edge beyond the legs, the front abutting surface, the top face and the bottom face overlying and bearing against corresponding walls of the digging edge to resist loads applied during digging, the top and bottom faces each being inclined downward in a forward direction relative to a central plane of the digging edge, and the front abutting surface facing rearward and being generally perpendicular to the central plane of the digging edge; and

an opening to receive a lock to hold the wear member to the digging edge.

12. A wear member in accordance with claim 11 wherein the opening is formed in only one leg.

13. A wear member in accordance with claim 11 wherein the front end of the cavity is further defined by side faces to resist side loading applied to the wear member.

14. A wear member in accordance with claim 11 wherein the cavity is asymmetric in vertical cross section.

15. A wear member in accordance with claim 14 wherein the opening includes a front wall and a rear wall, and the rear wall is longer in a direction toward the cavity than the front wall for increased engagement with the lock.

16. A wear member for protecting a digging edge of an excavating bucket, the wear member comprising:

a front portion adapted to contact abrasive materials during digging by the excavating bucket;

a cavity for receiving the digging edge, the cavity being open at a rear end to receive the digging edge and having a front end that dips downward relative to the rear end and is closed by a rearward facing abutting surface defining a front abutting surface, the front end being defined by a top face, a bottom face and the front abutting surface, the top face, the bottom face and the front abutting surface each overlying and bearing against corresponding walls of the digging edge to resist loads applied during digging, the top and bottom faces being generally parallel to each other, and the bottom face being generally at an acute angle to the front abutting surface; and

an opening for receiving a lock to hold the wear member to the digging edge.

17. A wear member in accordance with claim 16 wherein the front end of the cavity is further defined by side faces to resist side loading applied to the wear member.

18. A wear member in accordance with claim 16 wherein the front abutting surface is concave and curved about two perpendicular axes.

19. A wear member in accordance with claim 18 wherein the abutting surface has a center and the bottom face is at an acute angle to a plane extending tangential to the center of the abutting surface.

20. A wear member in accordance with claim 16 wherein the opening includes a rear face to contact substantially all of a rear wall of the lock installed between the rear face and a rear wall of the digging edge.

21. A wear member in accordance with claim 16 wherein the cavity is asymmetric in vertical cross section.