Drafted tool bit and blade assembly
AssigneeCaterpillar Inc.
InventorsDavid Bruno Parzynski, Jr., Thomas Marshall Congdon
Life of this patent
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Abstract
A material penetrating tool includes a shaft portion defining a central axis, and an enlarged cutting portion extending downwardly axially from the shaft portion. The enlarged cutting portion includes a rearward blunt surface, a front cutting surface, a first side surface and a second side surface, and the first side surface and the second side surface define an angle of extension measured in a plane perpendicular to the central axis, forming a wider forward cutting surface than the rearward blunt surface in a plane perpendicular to the central axis.
Claims20
A material penetrating tool for use with a ground working machine, the material penetrating tool comprising:
- a shaft portion including a cylindrical configuration and defining a central axis, a circumferential direction, and a radial direction;
- and
- an enlarged cutting portion extending downwardly axially from the shaft portion;
- wherein the enlarged cutting portion includes a rearward blunt surface, a front working region, a first side surface, and a second side surface,
- wherein the first side surface and the second side surface define an angle of extension measured in a first plane perpendicular to the central axis, forming a wider forward cutting surface than the rearward blunt surface in a second plane perpendicular to the central axis,
- wherein the front working region includes a first facet and a second facet, the second facet forming a first included obtuse angle with the first facet projected along the central axis and onto a third plane perpendicular to the central axis,
- wherein the front working region further includes a third facet forming a first external obtuse angle with the second facet projected along the central axis onto a fourth plane perpendicular to the central axis, and
- wherein the rearward blunt surface forms a right angle with a fourth fifth plane perpendicular to the central axis.
A penetrating bit for use with a ground working machine, the penetrating bit comprising:
- an attachment portion defining a longitudinal axis;
- and
- an enlarged penetrating portion extending downwardly axially from the attachment portion that is wider than the attachment portion;
- wherein the enlarged penetrating portion includes a back face, a front penetrating surface, a first side region, and a second side region,
- wherein the first side region or the second side region includes a first flat undrafted surface parallel to the longitudinal axis and a first flat drafted surface configured to reduce drag of the penetrating bit,
- wherein the first flat undrafted surface and the first flat drafted surface are adjacent along a direction that is perpendicular to the longitudinal axis, and
- wherein the first flat drafted surface forms a first included obtuse angle with the back face projected along the longitudinal axis onto a plane perpendicular to the longitudinal axis.
A penetrating bit for use with a ground working machine, the penetrating bit comprising:
- an attachment portion defining a longitudinal axis;
- and
- a penetrating portion extending downwardly axially from the attachment portion that is wider than the attachment portion;
- wherein the penetrating portion includes a back face, a first side region, a second side region, a front penetrating surface separating the first side region and the second side region, and a notch configured to receive an insert,
- wherein the first side region or the second side region includes a first undrafted surface that is parallel to the longitudinal axis and adjacent to a first drafted surface parallel to the longitudinal axis, and
- wherein both the first undrafted surface and the first drafted surface border the notch.
Dependencies are inferred from the claim text.