The present disclosure relates generally to a cutter assembly and, more particularly, to a cutter assembly configured to allow tool rotation.
Rotary material cutting and milling devices, such as, for example, road pavement mills, surface mining machines, and rotary cutter attachments for hydraulic excavators, utilize replaceable cutting tools or bits to cut and remove material from a surface. Typically, the cutting tools wear out quickly. For example, in heaving cutting and milling operations, the cutting tools may need to be replaced on a daily basis. In some cutting or milling devices, the cutting tool is removably mounted to a tool holder that is itself removably mounted to a rotary drum. In such devices, the tool holder may also wear out and require replacement.
Many cutting tools include features that facilitate removal of the cutting tool. One such feature is disclosed in U.S. Pat. No. 7,520,570 to Sansone et al. (“the '570 patent”). The '570 patent discloses a cutting tool holder mounted to a rotary member of a rotary cutting device. The tool holder may include a tapered body that may be removably received in a tapered tool holder socket. The tool holder may also include first and second extraction grooves. By applying force to extraction wedges, the wedges may be driven into the first and second grooves, thus causing the tool holder to move out of a tool holder socket.
Although the device of the '570 patent may facilitate removal of the tool holder, it may still be improved further. Specifically, although the tool holder of the '570 patent may be more easily removed, the usable life of the tool holder may still be limited. This disclosure is directed at overcoming one or more of the problems described above.
In one aspect, the present disclosure is directed to a base block for a cutting drum. The base block may include a first end. The first end may include an opening configured to receive a tool. The first end may also include a flat surface surrounding the opening. The base block may include a second end configured to abut the cutting drum. The base block may further include an internal passageway commencing at the opening configured to receive the tool. The passageway may define a longitudinal axis that is offset by an acute angle from being perpendicular to the flat surface.
In another aspect, the present disclosure is directed to a method of replacing a tool located in a base block of a cutting drum. The method may include inserting a removal device in a space between the base block and the tool. The space may be located between an upper surface of the base block and a lower surface of the tool. The lower surface of the tool and the upper surface of the base block may form an acute angle. The method may further include at least partially removing the tool from the base block by applying a force to the removal device. The method may also include rotating the tool about its longitudinal axis by an angle. The method may further include replacing the tool in the base block at the rotated angle.
In yet another aspect, the present disclosure is directed to a cutter assembly. The cutter assembly may include a base block having a flat upper surface and an opening located in the upper surface. The surface may be flat about the opening. The cutter assembly may also include a tool including a shaft configured to be received in the base block and a flange adjacent the shaft. The flange may have a flat lower surface. The shaft of the tool may be located in the opening of the base block such that a portion of the flat lower surface is adjacent to the upper surface of the base block. The flat lower surface of the flange and the flat upper surface of the base block may form an acute angle.
Base block 14 may be a rigid structure connected to cutting drum 10 and configured to secure tool 15. It is contemplated that base block 14 may be formed integrally with cutting drum 10. Alternatively, base block 14 may abut and be fixedly coupled to cutting drum 10 via welding, mechanical fasteners, and/or any other appropriate fastening method known in the art. In embodiments where base block 14 is welded to cutting drum 10, one or more dowels 19 may be located in alignment holes 21 in order to aid in alignment of base block 14. Base block 14 may be composed of metal or any other appropriate material. For example, base block 14 may be composed of hardened steel or tungsten carbide.
Base block 14 may include an upper surface 20 on a first end 24 of base block 14 (see also
Opening 22 and passageway 23 may define an axis A1. Axis A1 may be offset from being perpendicular to upper surface 20 by an angle β (see
Tool holder 16 may be a sleeve-like structure configured to hold cutting tool 18. Specifically, tool holder 16 may secure a shank 50 of cutting tool 18 such that cutting tool 18 may be applied to a cut a surface. It is contemplated that tool holder 16 may be composed of any appropriate material, such as, for example, hardened steel, tungsten carbide, diamond, or any combination thereof. Tool holder 16 may have a substantially cylindrical, rectangular, or any other appropriate shape. Tool holder 16 may include an internal passageway 26. Tool holder 16 may also include a tool receiving end 28. Tool receiving end 28 may be configured to receive cutting tool 18. It is contemplated that tool receiving end 28 may have the general shape of a truncated cone, and an outer surface of tool receiving end 28 may be slightly concave or may be flat.
Tool holder 16 may also have a flange 30 and a shaft 32. Shaft 32 may be tapered and configured to be slidably received by opening 22 and passageway 23 of base block 14. Specifically, shaft 32 may have the shape of a truncated cone. It is contemplated that shaft 32 may be secured in base block 14 via an interference fit. Shaft 32 may additionally or alternatively include a hole 34 near a terminal portion of shaft 32. Hole 34 may be configured to receive a pin member 36 to secure tool holder 16 in base block 14.
Tool holder 16 may include an annular recess 38. An access hole 40 may be located in or near annular recess 38. Access hole 40 may be configured to allow a cutting tool extractor (not shown) to access and release cutting tool 18. A location of access hole 40 may additionally or alternatively provide a desired point of weakness at which tool holder 16 may fail in excessive load situations.
Cutting tool 18 may be any tool configured to cut. Cutting tool 18 may include a tip 46, a central portion 48, and shank 50. Tip 46 may have general conical shape. Tip 46 may be composed of diamond, tungsten carbide, or any other appropriate material. Tip 46 may be secured to central portion 48. Central portion 48 may be composed of hardened steel, tungsten carbide, or any other appropriate material. Shank 50 may be configured to be received and secured by tool holder 16. Shank 50 may be secured by an interference fit or by a securing mechanism, such as a spring, a dowel, or any other securing mechanism known in the art.
Referring to the embodiment of cutter assembly 12 shown in
As can be seen in
Lower surface 42 of tool 15 may be substantially flat and define a plane that is substantially perpendicular to axis A2. It is contemplated that an outer edge of flange 30 may have a chamfer 44 to distribute load due to any contact between flange 30 and upper surface 20. When tool 15 is received within base block 14, lower surface 42 of tool 15 and upper surface 20 of base block 14 may form a space 51. Space 51 may be substantially wedge shaped (e.g., wedge may be defined by angle β). It is contemplated that a space 51 may exist on each lateral side of tool 15.
As shown in
Key 52 may be located on upper surface 20 of base block 14. It is contemplated that key 52 may alternatively or additionally be located in passageway 23 or in any other appropriate location on base block 14. When key 52 is located on upper surface 20, surface feature 54 may be located on an outer periphery of flange 30. When key 52 is located in passageway 23, surface feature 54 may be located on shaft 32.
Tool 15 may include a plurality of surface features 54 to allow tool 15 to be positioned in several different orientations. For example, as shown in
As shown in
It is contemplated that each of surfaces 60, 62, 64, and 66 may mate with a corresponding surface on key 52. Specifically, as shown in
As shown in
As shown in
Rotating tool 15 about axis A1 and replacing tool 15 may expose a different surface, such as second surface 72, to the harsher wear conditions. It is contemplated that tool 15 may be rotated different amounts depending on wear conditions and the configuration of tool 15. For example, as shown in
A first side 84 of v-shaped surface 82 may allow insertion of a wedge-shaped removal tool 68 in a direction transverse to axis A1 in order to force tool 15 free of base block 14. If tool 15 is rotated by 180 degrees about axis A2, a second side 86 of v-shaped surface 82 may also allow insertion of wedge-shaped removal tool 68 for removal of tool 15 from base block 14. Therefore, v-shaped surface 82 may allow removal and rotation of tool 15 located in base block 14.
The disclosed cutter assembly may be applicable to any cutting device. The disclosed cutter assembly may also allow for the tool to be configured at several different angular orientations within the base block. The disclosed cutter assembly may also provide for easy removal of the tool. It is contemplated that the disclosed cutter assembly, and specifically the configuration of the base block and the tool, may allow for rotation and reuse of a given tool, and thus provide improved usable life. Productivity may also be increased since removing and rotating an existing tool may be accomplished more quickly than removing an existing tool and replacing it with a new tool.
It will be apparent to those skilled in the art that various modifications and variations can be made to the disclosed cutter assembly. Other embodiments will be apparent to those skilled in the art from consideration of the specification and practice of the disclosed cutter assembly. It is intended that the specification and examples be considered as exemplary only, with a true scope being indicated by the following claims.
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Number | Date | Country |
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729796 | May 1955 | GB |
2068435 | Aug 1981 | GB |
Number | Date | Country | |
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20120001475 A1 | Jan 2012 | US |