Assembly for securing a wear member to an excavator
First Claim
1. A wear member for attachment to an excavator on which is fixed a base having a forwardly directed convex bearing face, the wear member comprising a rear mounting portion that wrape at least partially about the base, a front working portion, and a rearward facing abutting surface adapted to abut the bearing face of the base, the abutting surface being concave and curved generally about two generally perpendicular axes so as to define generally a bowl-like surface with which to engage the convex bearing face of the base.
3 Assignments
0 Petitions
Accused Products
Abstract
An assembly for mounting an excavating tooth particularly suited for a dredge cutterhead includes a base, an adapter, and a lock. The base includes a convex, curved bearing surface that abuts a concave, curved bearing surface on the adapter. The curved bearing surfaces are able to maintain substantially full contact with each other under transverse loading.
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Citations
82 Claims
- 1. A wear member for attachment to an excavator on which is fixed a base having a forwardly directed convex bearing face, the wear member comprising a rear mounting portion that wrape at least partially about the base, a front working portion, and a rearward facing abutting surface adapted to abut the bearing face of the base, the abutting surface being concave and curved generally about two generally perpendicular axes so as to define generally a bowl-like surface with which to engage the convex bearing face of the base.
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33. A wear member for attachment to an excavator on which is fixed a base having a forwardly directed convex bearing face, the wear member comprising
a rear mounting portion that wraps at least partially about the base, a front working portion, a rearward facing abutting surface adapted to abut the bearing face of the base, the abutting surface being concave and curved generally about a first axis, and an opening for receiving a lock, the opening having a front wall portion and a rear wall portion, the rear wall portion being adapted to oppose the lock to thereby hold the wear member to the excavator, the rear wall portion being concave and curved generally about a second axis generally parallel to the first axis, wherein the curvature of the rear wall portion is defined by a first radius of curvature and the curvature of the abutting surface is defined by a second radius of curvature, and wherein the first and second radii of curvature each originate from substantially the same location.
- 44. A wear member for attachment to an excavator on which is fixed a base having a front end, the wear member comprising a rear mounting portion for securing the wear member to the excavator, a front working portion, and a rearward facing abutting surface adapted to abut the front end of the base, the abutting surface being concave and curved simultaneously about perpendicular axes.
- 54. A wear member for attachment in a series of identical wear members along a front edge of an arm of a dredge cutterhead, the arm having a plurality of locator formations each having an identical shape that defines a first longitudinal axis extending outward of the arm, each locator formation further having a unique orientation relative to the front edge of the arm such that the first longitudinal axis of each said locator formation intersects the front edge of the arm at an angle that is different from the first longitudinal axis of at least one other locator formation on said arm, each said wear member comprising a front working portion projecting forward of the front edge of the arm and having a second longitudinal axis, a leg extending over a surface of the arm rearward of the front edge, a rearward facing mounting structure that matingly engages the locator formation, the mounting structure including positioning surfaces that contact the locator formation and prevent lateral movement of each said wear member along the arm, the positioning surfaces positioning the second longitudinal axis at a particular orientation to the first longitudinal axis such that the particular orientation is the same for each said wear member along the front edge of the arm, and means for securing the wear member to the arm in the particular orientation determined by contact of the positioning surfaces and the locator formations, and a rearward facing abutting surface extending generally transverse to a central axis of the wear member to abut a corresponding bearing face supported by the arm, the abutting surface being concave and curved generally about two generally perpendicular axes so as to define generally a bowl-like surface with which to engage the convex bearing face of the base.
- 61. A wear member for attachment to an excavator on which is fixed a base having a front end, the wear member comprising a rear mounting portion and a front working portion, the mar mounting portion including an abutting surface for abutting the front end of the base, the abutting surface having a shape that conforms to a surface of a sphere.
- 67. A wear member for attachment to an excavator on which is fixed a base having a front end, the wear member comprising a rear mounting portion including a recess for receiving the front end of the base, a front working portion, and a rearward facing abutting surface at the front end of the recess to abut the front end of the base, the abutting surface being a concave surface that is generally continuously curved about perpendicular axes.
- 72. A wear member for attachment to an excavator on which is fixed a base having a front end, the wear member comprising a front working portion and a rear mounting portion, the rear mounting portion including a rearwardly opening recess for receiving the front end of the base, the recess being defined by top and bottom walls, sidewalls, and a front end wall to abut the front end of the base, the front end wall having a generally curved, concave shape with a first curvature extending across the recess from one sidewall to the other, and a second curvature extending across the recess from the top wall to the bottom wall.
- 79. A wear member for attachment to an excavator on which is fixed a base having a front end, the wear member comprising a rear mounting portion for securing the wear member to the excavator, a front working portion, and a rearward facing abutting surface adapted to abut the front end of the base, the abutting surface having a central portion and marginal portions surrounding the central portion, and the abutting surface being concave and gradually curved such that the marginal portions curve rearward from the central portion in a generally uniform manner about perpendicular axes.
Specification