Mineral winning pick, pick holder, and combination
AssigneeEsco Group LLC
InventorsRoberto de Jesus Torres Delgado, William Stephen Clapham
Life of this patent
Estimating the term…
Abstract
An improved pick and pick holder assembly for use in mineral winning and the like. The improved pick and pick holder increases the effective life of a tool and pick holder by minimizing the shifting of the pick within the pick holder. The movement of the pick is minimized by front and rear bearing surfaces that remain positively engaged with front and rear bearing surfaces of the pick holder for loads applied to the pick that are predominantly inward and predominantly rearward.
Claims48
A pick for attachment to an excavating machine comprising a head having a strike point to strike a surface to be excavated when moved forward during operation, and a shank extending from the head to be received into a pick holder secured to the excavating machine, the shank being oriented such that a line aligned with a true inwardly-directed force extending normal to the forward movement and applied to the strike point will intersect the shank, wherein the shank has a front end and a rear end opposite the front end, and sidewalls extending between the front and rear ends, and wherein the front end and the rear end each includes a pair of planar bearing surfaces to bear against complementary surfaces on the pick holder, and the bearing surfaces in each said pair converge toward each other as they extend from the sidewalls.
A pick for attachment to an excavating machine comprising a head having a strike point to strike a surface to be excavated when moved forward during operation, and a shank extending from the head to be received into a pick holder secured to the excavating machine, the shank being oriented such that a line aligned with a true inwardly-directed force extending normal to the forward movement and applied to the strike point will intersect the shank, including a shoulder having at least one bearing surface to bear against the pick holder that extends farther forward than the line, wherein the shank has a front end and a rear end opposite the front end, and sidewalls extending between the front and rear ends, and wherein the front end and the rear end each includes a pair of planar bearing surfaces to bear against complementary surfaces on the pick holder, and the bearing surfaces in each said pair converge toward each other as they extend from the sidewalls.
A pick for attachment to an excavating machine comprising a shank to be received into a pick holder secured to the excavating machine, a blade having a strike point to strike a surface to be excavated when moved forward during operation and a forwardly extending shoulder with an underside bearing surface to bear against the pick holder, wherein the underside bearing surface extends forward of a line aligned with a true inwardly-directed force extending normal to the forward movement and applied to the strike point and the pick is free of a heel to the rear of the shank.
A pick assembly for attachment to an excavating machine for working a material to be excavated, the pick assembly comprising:
- a pick holder adapted to be secured to the excavating machine, the pick holder having an opening and a bearing surface;
- a pick comprising a blade having a strike point to strike a surface to be excavated when moved forward during operation, a shank extending from the blade to be received into the opening in the pick holder, and a forwardly-extending shoulder with an underside bearing surface to bear against the bearing surface of the pick holder, wherein the pick is free of a heel to the rear of the shank and the underside bearing surface of the shoulder extends forward of a line aligned with a true inwardly-directed force extending normal to the forward movement and applied to the strike point;
- and
- a securement mechanism to secure the pick to the pick holder.
A pick for attachment to an excavating machine comprising a head having a strike point that moves forward during use to impact and separate material to be excavated, and a shank extending from the head to be received in a pick holder secured to the excavating machine, wherein the head has a shoulder with a bearing surface that extends forward from the shank to bear against the pick holder, and is free of a heel with an underside bearing surface extending rearward from a longitudinal extension of the exterior of the shank.
Dependencies are inferred from the claim text.