This disclosure relates to bit assemblies for road milling, mining, and trenching equipment.
Road milling, mining, and trenching equipment utilizes bits or inserts traditionally set in a bit assembly having a bit holder and a bit holder block. The insert is retained within the bit holder which is retained within a bore in the bit holder block. A plurality of the bit assemblies are mounted on the outside of a rotatable drum, typically in a V-shaped or spiral configuration, or the plates are mounted to a chain driven boom or a wheel trencher. The combinations of bit assemblies have been utilized to remove material from the terra firma, such as degrading the surface of the earth, minerals, cement, concrete, macadam or asphalt pavement. Individual bits, bit holders, and bit holder blocks may wear down or break over time due to the harsh cutting environment. In various trenching cutting conditions, a hardened insert, such as a tungsten carbide insert, is used to initially impact the surface material and break it down into smaller removable pieces which are then carried outside the trenched area to the adjacent surface alongside the trenching machine. The bit assembly of the present disclosure uses a hardened insert in combination with a bit holder having vertical vanes configured to aid in removing the loosened material, assist in the rotation of the tool, and allow the profile at the forward end of the tool to wear symmetrically.
This disclosure relates generally to bit assemblies for road milling, mining, and trenching equipment. One implementation of the teachings herein is a bit holder that includes a forward body portion comprising a plurality of vanes axially and radially extending from a top surface of the body portion to a generally cylindrical tire portion of the body portion; and a generally cylindrical shank depending axially from the forward body portion, the shank comprising an annular groove adjacent a distal end of the shank.
In another implementation of the teachings herein is a bit holder that includes a forward body portion comprising at least one vane axially and radially extending from a top surface of the body portion to a generally cylindrical tire portion of the body portion; and a generally cylindrical shank depending axially from the forward body portion, the shank comprising an annular groove adjacent a distal end of the shank.
These and other aspects of the present disclosure are disclosed in the following detailed description of the embodiments, the appended claims and the accompanying figures.
The various features, advantages, and other uses of the apparatus will become more apparent by referring to the following detailed description and drawings, wherein like reference numerals refer to like parts throughout the several views. It is emphasized that, according to common practice, the various features of the drawings are not to-scale. On the contrary, the dimensions of the various features are arbitrarily expanded or reduced for clarity.
Road milling, mining, and trenching equipment utilizes bits or inserts traditionally set in a bit assembly having a bit holder, comprising a bit holder body and a shank, and a bit holder block. The insert is retained within the bit holder which is retained within a bore in the bit holder block, hereinafter referred to as the base block. The base block supports the tool and is welded to its support member. The combinations of bit assemblies have been utilized to remove material from the terra firma, such as degrading the surface of the earth, minerals, cement, concrete, macadam or asphalt pavement. The tool of the present disclosure is designed to be used in various trenching cutting conditions, whether cutting rock formations, cutting a combination of rock and dirt or soil, or removing strictly soil. The tool includes a hardened insert, such as a tungsten carbide insert, brazed into a pocket or seat at the forward end of the tool. The hardened insert is used to initially impact the surface material and break it down into removable size pieces that fit within the pocket or space between the vanes of the tool and carry the removable size pieces outside the trenched area to the adjacent surface alongside the trenching machine. The spaced cavities of the tool are supported by vertical vanes that also aid in removing loosened material. The vertical vanes of the tool are also configured to aid in the rotation of the tool as well, which allows the profile at the forward end of the tool to wear symmetrically.
Referring to
In this illustrated embodiment, the forward body portion 24 comprises three radially extending wings or vanes 28, 30, 32 that axially extend from the flat top surface 22 to the tire portion 26. The vanes 28, 30, 32 converge proximate the axis of rotation A, shown in
The shank 20, coaxial with the bit holder body 18, axially depends from the decreased diameter tapered distal portion 46 of the bit holder body 18. The shank 20 may be solid and may have a single diameter along its entire length, or may have sections of varying diameters. In other embodiments, the shank 20 can be cylindrical or can include tapered and/or arcuate segments. The shank 20 in the illustrated embodiment comprises a generally cylindrical increased diameter first segment 48 that axially extends from the decreased diameter tapered distal portion 46 and a generally cylindrical decreased diameter second segment 50. The first segment 48 is joined to the second segment 50 by a shoulder 52. The second segment 50 axially extends from the shoulder 52 to a tapered distal segment 54 which axially extends to a distal end 56 of the shank 20. The second segment 50 includes an annular groove 58, having an axial length 60, shown in
The bit retainer 62 includes a metal body having a thickness 82, shown in
Referring to
The insert 12 is positioned and brazed in the generally cylindrical bore 40 of the flat top surface 22 of the bit holder body 18. The bit holder 14 is then inserted into the base block bore 70 of the front end 66 of the base block 16, forming a minimally spaced contact between the shank 20 and the base block bore 70. The bit holder 14 and the base block 16 are assembled together to form the bit assembly 10 (
The legs 74, 76 of the bit retainer 62 are fitted into the annular groove 58 of the shank 20. The thickness 82 of the bit retainer 62 is less than the axial length 60 of the shank 20 such that the legs 74, 76 can slidably engage the annular groove 58 until the arcuate portion 84 becomes engaged with a complementarily-shaped portion of the annular groove 58. The bit retainer 62 has an outer dimension larger than the diameter of the portion of the base block bore 70 extending through the rearward face 72 of the base block 16. Once fully engaged and assembled, the bit retainer 62 retains the bit holder 14 within the base block bore 70 of the base block 16.
While the present disclosure has been described in connection with certain embodiments, it is to be understood that the invention is not to be limited to the disclosed embodiments but, on the contrary, is intended to cover various modifications and equivalent arrangements included within the scope of the appended claims, which scope is to be accorded the broadest interpretation so as to encompass all such modifications and equivalent structures as is permitted under the law.
This application claims priority to U.S. Provisional Application No. 62/366,779, filed Jul. 26, 2016, to the extent allowed by law and the contents of which are incorporated herein by reference in their entireties.
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