Wear assembly

• US 7,997,017 B2
• Filed: 06/03/2010
• Issued: 08/16/2011
• Est. Priority Date: 12/21/2005
• Status: Active Grant

• Current Assignee: ESCO Group LLC (WEIR Group PLC)
• Original Assignee: ESCO Corporation (WEIR Group PLC)
• Inventors: Briscoe, Terry L, McClanahan, Robert
• Primary Examiner(s): Pezzuto; Robert E
• Application Number:
  US12/792,954
• Publication Number:
  US 20100236109A1
• Time in Patent Office: 439 Days
• Field of Search: 374/49, 374/50, 37452-457, 403/350, 403/374.3, 172/374.4, 172/372, 172/753, 172/772, 1727011-7013
• US Class Current: 37/455
• CPC Class Codes: E02F 9/2833 Retaining means, e.g. pins
• CPC Class Codes: E02F 9/2883 Wear elements for buckets or implements in general
• CPC Class Codes: Y10T 403/7069 Axially oriented

Abstract

In a wear assembly for securing wear members to excavating equipment, a spool is used with a wedge to hold the wear member in place. The spool is formed with at least one laterally extending arm at its upper end in lieu of an axial arm such as used in a conventional C-shaped spool. In this way, the spool can be easily supported in the assembly as the wedge is installed. The spool does not fall through the opening and no special care is needed to prevent it from falling. The spool also holds itself in place when the wedge is driven into the passage. As a result, installation of the wear assembly is easier and less hazardous. In addition, the lateral support reduces the risk that the spool will suffer spreading.

Claims

1. A wear assembly for attachment to a lip of an excavating bucket wherein the lip has an inner surface, an outer surface and at least one through-hole extending through the lip, the through-hole opening in each of the inner and outer surfaces and having a shoulder defined between the inner and outer surfaces, the wear assembly comprising:

a wear member having a front end to contact materials to be gathered into the bucket during excavating, an outer leg along the outer surface of the lip, and an inner leg to extend along the inner surface of the lip, the inner leg including a hole that generally aligns with the through-hole in the lip when the wear member is placed on the lip;

a spool received into the hole in the inner leg of the wear member and the through-hole in the lip, the spool including a body, a lower arm projecting rearwardly from the body to contact the shoulder in the through-hole of the lip, and a pair of upper arms each projecting laterally from the body to contact the inner leg of the wear member; and

a wedge received into the hole in the inner leg of the wear member and the through-hole in the lip forward of the spool, the wedge including a leading end and a trailing end, an external surface that tapers toward the leading end, and a longitudinal axis extending from the trailing end to the leading end, the wedge being axially movable in the through-hole such that movement of the wedge in a downward direction causes the wear member to be tightly held to the lip and movement of the wedge in an upward direction enables removal of the wedge and release of the wear member from the lip.

2. A wear assembly in accordance with claim 1 wherein the spool includes a thread formation and the exterior surface of the wedge has a helical thread that engages the thread formation of the spool so that rotation of the wedge axially moves the wedge in the downward and upward directions.

3. A wear assembly in accordance with claim 2 wherein the lower arm of the spool includes an inner surface to contact the shoulder of the through-hole, each of the upper arms includes an inner surface to contact the inner leg of the wear member, and the inner surface of the lower arm diverges in a rearward direction from the inner surfaces of the upper legs.

4. A wear assembly in accordance with claim 3 wherein the wear member includes a bearing surface to each side of the hole such that the inner surface of each upper arm contacts one of the bearing surfaces.

5. A wear assembly in accordance with claim 4 wherein the inner surfaces of the lateral arms and the bearing surfaces of the wear member are each inclined upward in the rearward direction.

6. A wear assembly in accordance with claim 5 wherein each of the bearing surfaces of the wear member is inclined in the rearward direction at a uniform slope.

7. A wear assembly in accordance with claim 4 wherein the inner surfaces of the upper arms of the spool are forward of the inner surface of the lower arm of the spool.

8. A wear assembly in accordance with claim 1 wherein a recess is defined in an exterior surface of the outer leg to each side of the hole such that each said recess receives one of the lateral arms of the spool.