Non-rotating drill bit for cutting tool

Abstract

A cutting bit assembly for attachment to a tool holder of a milling-type machine, the cutting bit assembly including a cutting tip, a generally cylindrical handle extending from the cutting tip, a spring clip surrounding a body of the handle and including a collapsed configuration and an expanded configuration, and a gasket having an installed configuration and an uninstalled configuration, the washer in the mounted configuration is disposed on the shoulder of the handle, and the washer in the unmounted configuration surrounds the spring clip and holds the spring clip in the retracted configuration. At least one of the distal edge of the spring clip or the proximal edge of the bore of the washer includes a ramp or a radius.

Description

Technical Field

[0001] The present disclosure relates generally to drill bits for cutting tools, and more particularly to a non-rotating drill bit assembly for a tool holder of a milling type machine, such as a cold planer or a rotary mixer. Background Art

[0002] Roads with asphalt surfaces are designed to facilitate vehicle travel. Depending on the intensity of use, base conditions, temperature changes, moisture changes, and / or physical age, the surface of a road may eventually become deformed, uneven, unable to support wheel loads, or otherwise unsuitable for vehicle traffic. In order to restore a road for continued vehicle use, the worn surface of the road (e.g., asphalt or concrete) is removed in preparation for resurfacing.

[0003] A cold planer, sometimes also called a road builder or scarifier, is a machine that typically includes a frame supported by a tracked or wheeled drive unit. The frame is configured to provide mountings for an engine, an operator station, and a milling drum. The milling drum, which is equipped with cutting tools, is rotated by the engine through a suitable interface to break up the road surface. In a typical configuration, a plurality of cutting tools are provided on the outer surface of the milling drum. The cutting drill bit is typically mounted on a tool holder so that the cutting drill bit is free to rotate during use.

[0004] However, the rotation of the cutting bit has several significant disadvantages. For some cutting bits, such as those with polycrystalline diamond (PCD) tips, the rotation of the cutting bit allows all sides of the bit to wear, which reduces the strength of the bit. In addition, the rotation of the cutting tool can cause wear and therefore reduce the maintenance of the tool holder. For example, the rotation of the cutting bit can cause wear of the surface and inner hole of the tool holder (contacted by the cutting bit), making the tool holder less effective or unable to hold the cutting bit.

[0005] U.S. Patent No. 8,646,848 to Hall et al. (hereinafter referred to as the '848 patent) discloses a pick assembly that includes a pick handle that is configured to be directly press-fitted into a hole in a block. The pick handle includes an inner surface and an outer surface, and the pick handle includes a pick head opposite the handle. The handle includes at least one longitudinal groove that extends from a distal end of the handle along the handle toward the pick head. The groove allows the handle to elastically collapse when inserted into the hole while maintaining a press fit between the hole and the handle. Additionally, the handle has a tapered area that engages with a corresponding tapered area of ​​the hole of the block in a press-fit manner.

[0006] The '848 patent requires a block with a non-standard tapered bore. Thus, the pick shank cannot be used as a universal replacement without first modifying the cutting machine to have the required tapered block.

[0007] The cutting bit assembly of the present disclosure solves one or more of the problems set forth above and / or other problems in the art. Summary of the invention

[0008] One aspect of the present disclosure is directed to a cutting drill bit assembly for attachment to a tool holder of a milling-type machine, the cutting drill bit assembly comprising a cutting tip, a generally cylindrical shank extending from the cutting tip, a spring clip surrounding a body of the shank and comprising a collapsed configuration and an expanded configuration, and a washer having an installed configuration and an uninstalled configuration, the washer in the installed configuration being disposed on a shoulder of the shank, the washer in the uninstalled configuration surrounding the spring clip and holding the spring clip in the collapsed configuration. At least one of a distal edge of the spring clip or a proximal edge of a bore of the washer comprises a chamfer or radius.

[0009] In another aspect, a method for removing a cutting drill bit assembly from a tool holder of a milling-type machine, wherein the cutting drill bit assembly includes a spring clip that engages a mounting hole of the tool holder, the method comprising sliding a shank of the cutting assembly out of the mounting hole of the tool holder, and as the shank slides out of the mounting hole, sliding a washer from a shoulder of the shank onto the spring clip to retain the spring clip in a retracted configuration.

[0010] On the other hand, a gasket for a cutting drill bit assembly for a milling-type machine includes an annular structure defining a hole extending along a longitudinal axis, a beveled outer distal edge of the annular structure, a beveled proximal edge of the hole, a beveled distal edge of the hole, and a vertical side wall of the hole between the proximal edge of the hole and the distal edge of the hole. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate various exemplary embodiments and, together with the description, serve to explain the principles of the disclosed embodiments.

[0012] Figure 1 is an exploded view of a cutting tool for a cold planer according to aspects of the present disclosure.

[0013] Figure 2 is a perspective view of a cutting bit according to aspects of the present disclosure.

[0014] Figure 3 According to various aspects of the present disclosure, Figure 2 A perspective view of a cutting drill bit assembly of a cutting drill bit.

[0015] Figure 4 yes Figure 3 A perspective view of the spring clip of a cutting bit assembly.

[0016] Figure 5 It was taken along line 5-5 Figure 4 Cross-sectional view of a spring clip.

[0017] Figure 6 It was taken along line 6-6 Figure 3 Cross-sectional view of a cutting drill bit assembly.

[0018] Figure 7 is a perspective view of an alternative cutting bit according to aspects of the present disclosure.

[0019] Figure 8 According to various aspects of the present disclosure, Figure 7 A side elevation view of a cutting bit assembly of a cutting bit.

[0020] Fig. 9A yes Figure 8 A perspective view of the spring clip of a cutting bit assembly.

[0021] Fig. 9B is a perspective view of an alternative spring clip according to aspects of the present disclosure.

[0022] Fig.10 It was taken along line 10-10 Figure 8 Cross-sectional view of a cutting drill bit assembly.

[0023] Fig.11 is a perspective view of yet another cutting bit according to aspects of the present disclosure.

[0024] Fig.12 According to various aspects of the present disclosure, Fig.11 A side view of a cutting bit assembly of a cutting bit.

[0025] Fig.13 is taken along line 13-13 according to aspects of the present disclosure Fig.12 Cross-sectional view of a cutting drill bit assembly.

[0026] Fig.14 It was taken along line 14-14 Fig.12 Cross-sectional view of a cutting drill bit assembly.

[0027] Fig.15 is a cross-sectional view of yet another cutting bit assembly according to aspects of the present disclosure.

[0028] Fig.16 is a cross-sectional view of yet another cutting bit assembly according to aspects of the present disclosure.

[0029] Fig.17 A flow chart is provided that depicts an exemplary method for installing a cutting bit assembly into a tool holder according to aspects of the present disclosure.

[0030] Fig.18A flow chart is provided depicting an exemplary method for removing a cutting bit assembly from a tool holder according to aspects of the present disclosure.

[0031] Fig.19 is a cross-sectional view of a cutting bit assembly according to aspects of the present disclosure with a washer in an installed position.

[0032] Fig. 20 yes Fig.19 A cross-sectional view of a cutting drill bit assembly with a washer in a pre-installation or post-installation position.

[0033] Fig.21 yes Fig. 20 A cross-sectional view of a detail of a cutting drill bit assembly 21.

[0034] Fig. 22 yes Fig.19 Top view of the gasket.

[0035] Fig.23 is along Fig. 22 The line 23-23 is intercepted Fig.19 Cross-sectional side view of a gasket.

[0036] Fig.24 yes Fig.23 A cross-sectional view of a detail of the gasket 24. DETAILED DESCRIPTION

[0037] The foregoing general description and the following detailed description are exemplary and illustrative only and are not limitations of the claimed features. As used herein, the terms "comprises / comprising / includes / including", "has / having", "limited", or other variations thereof are intended to cover non-exclusive inclusions such that a process, method, article, or apparatus that includes a series of elements includes not only these elements, but may also include other elements that are not expressly listed or inherent to such processes, methods, articles, or apparatuses. In this disclosure, unless otherwise stated, relative terms such as, for example, "about", "substantially", and "approximately" are used to indicate possible variations of ±10% of the stated values. In all figures, the same reference numerals represent the same components.

[0038] Reference Figure 1, a cold planer or other milling type machine (e.g., a rotary miller) includes a milling drum 100, which is a generally cylindrical rotating structure for cutting and grinding a substrate such as road asphalt. The milling drum 100 has an outer surface 102, and a plurality of cutter assemblies 104 are arranged on the outer surface 102. Each cutter assembly 104 includes a cutter mounting block 108, a tool holder 110, and a cutting drill bit assembly 200. The cutter assemblies 104 can be arranged in such a manner that rotation of the milling drum 100 causes the cutting drill bit assembly 200 of each cutter assembly 104 to break up and remove material from the road surface and direct such material to a collection device (not shown). Although in Figure 1 Only a single cutter assembly 104 is shown in FIG. 1 , but the milling drum 100 may have multiple cutter assemblies 104 arranged in a series of rows, rings, spirals, etc. on the outer surface 102 .

[0039] For each tool assembly 104, a tool mounting block 108 may be secured to the milling drum outer surface 102, such as by welding, and is configured to removably receive a tool holder 110 in a mounting hole 114 of a mounting portion 116. The tool holder 110 includes an end face 120 and a mounting hole 122 configured to removably receive a cutting drill bit assembly 200. The mounting hole 122 may have an inner diameter of, for example, 20 millimeters (mm). Figure 1 And further refer to Figure 2 and Figure 3 , the cutting drill bit assembly 200 includes a cutting tip 210 and a shank 220 extending from the cutting tip 210. The cutting tip 210 can be substantially conical and can have a substantially pointed distal end 212 that tapers radially outward to form a flange 214 from which the shank 220 extends. The flange 214 can have a diameter of about 42 to 48 mm, and in some aspects about 45 mm. In some aspects, the distal end 212 includes a polycrystalline diamond tip for milling a substrate, alternatively, other abrasive materials can be used.

[0040] Continue to refer to Figure 2, the handle 220 includes a body 222, a shoulder 228 between the body 222 and the flange 214, and a proximal end 224. The body 222 of the handle 220 is generally cylindrical except for the presence of a rotation limiting surface 230, as described below. The shoulder 228 is generally cylindrical and extends 360° around the body 222. The shoulder 228 can have an outer diameter slightly smaller than the diameter of the mounting hole 122 of the tool holder 110, so that the shoulder 228 has a clearance fit with the mounting hole 122. For example, the shoulder 228 can have an outer diameter slightly less than 20 mm. The shoulder 228 can extend longitudinally from the flange 214 by about 3 to 12 mm, and in some aspects about 5 mm. Except for the notch 226, the proximal end 224 can be generally cylindrical, as described below. The proximal end 224 can have an outer diameter slightly smaller than the diameter of the mounting hole 122 of the tool holder 110, so that the proximal end 224 has a clearance fit with the mounting hole 122. For example, the proximal end 224 can have an outer diameter slightly less than 20 mm. The proximal end 224 can have a length of about 5 to 15 mm, and in some aspects about 10 mm.

[0041] The body 222 of the handle 220 has an outer diameter that is smaller than the outer diameters of the shoulder 228 and the proximal end 224, such as a diameter of about 10 to 36 mm, and in some aspects about 14 mm. The body 222 of the handle 220 can have a length of about 25 to 50 mm, i.e., the distance between the shoulder 228 and the proximal end 224, and in some aspects about 35 mm. The handle 220, including the body 222, the proximal end 224, and the shoulder 228, can be made of a strong rigid material, such as heat-treatable steel (e.g., AISI 1040 steel).

[0042] like Figure 1 and Figure 3 As shown, the body 222 is at least partially surrounded by a spring clip 260 that can be elastically deflected between a contracted (or compressed) configuration and an expanded (or uncompressed) configuration. The spring clip 260 can be made of a material that imparts elasticity to the spring clip 260, such as spring steel.

[0043] The elasticity of the spring clip 260 allows the spring clip 260 to be in an expanded configuration without external constraints. The outer diameter of the spring clip 260 in the expanded configuration is greater than the inner diameter of the mounting hole 122 of the tool holder 110. The outer diameter of the spring clip 260 in the contracted configuration is less than the outer diameter of the expanded configuration to allow the spring clip 260 to be inserted into the mounting hole 122 of the tool holder 110. The outer diameter of the spring clip 260 in the contracted configuration is slightly larger than the inner diameter of the mounting hole 122, thereby creating a slight press fit between the mounting hole 122 and the spring clip 260 in the contracted configuration. For example, the outer diameter of the spring clip 260 in the contracted configuration can be slightly larger than 20 mm. In some aspects, the outer surface of the spring clip 260 can have a surface treatment to increase friction with the mounting hole 122.

[0044] Now refer to Figure 3 , the cutting drill bit assembly 200 also includes a washer 290 that surrounds the spring clip 260 and holds the spring clip 260 in a retracted configuration on the body 222 of the shank 220. The washer 290 is generally flat and annular in shape, having an outer diameter and a hole concentric with the outer diameter. The washer 290 can have an outer diameter approximately equal to the outer diameter of the flange 214. The washer 290 can have a thickness of approximately 3 to 8 mm, and in some aspects approximately 5 mm. The hole of the washer 290 has a diameter corresponding to the outer diameter of the spring clip 260 in the retracted configuration. The proximal edge 292 and the distal edge (at Figure 3 The proximal edge 296 and the distal edge 298 of the outer diameter of the washer 290 may be beveled to facilitate installation, removal and / or reuse of the drill bit assembly 200, as described below. Similarly, the proximal edge 296 and the distal edge 298 of the outer diameter of the washer 290 may be beveled to facilitate installation, removal and / or reuse of the drill bit assembly 200, as described below.

[0045] The bias of the spring clip 260 acts on the hole of the washer 290, which results in a friction fit that maintains the axial position of the washer 290 on the spring clip 260. When the cutting drill assembly 200 is installed in the mounting hole 122 of the tool holder 110 (see Figure 1 ), the washer 290 is pushed onto the shoulder 228 and abuts against the flange 214 (to Fig.12 and Fig.14 The bevel on the distal edge of the hole of the washer 290 can guide the washer 290 onto the shoulder 228.

[0046] Reference Figure 2 and Figure 3 , the proximal end 224 of the handle 220 can hold the spring clip 260 axially on the body 222 of the handle 220. The spring clip 260 in the expanded configuration can have an inner diameter that is greater than or equal to the outer diameter of the proximal end 224, so that the spring clip 260 can be slid over the proximal end 224 to install the spring clip 260 on the body 222 of the handle 220. The washer 290 can be installed after the spring clip 260 has been slid onto the body 222 of the handle 220. The washer 290 forces the spring clip 260 into a collapsed configuration, where the inner diameter of the spring clip 260 in the collapsed configuration is smaller than the outer diameter of the proximal end 224 of the handle 220. Thus, when in the collapsed configuration, the spring clip 260 cannot slide over the proximal end 224. Similarly, the inner diameter of the spring clip 260 in the collapsed configuration is smaller than the outer diameter of the shoulder 228, so when in the collapsed configuration, the spring clip 260 cannot slide over the shoulder 228. Thus, the spring clip 260 is retained between the shoulder 228 and the proximal end 224 .

[0047] Continue to refer to Figure 2, the handle 220 includes a rotation limiting surface 230, which is configured to interact with the spring clip 260 to limit the rotation between the handle 220 and the spring clip 260. Figure 2 In the illustrated aspect, the rotation limiting surface 230 includes a first flat surface 232 and a second flat surface 234. The first flat surface 232 and the second flat surface 234 can be recessed into the body 222 of the handle 220 and can be adjacent to each other and at an angle α (see Figure 6 ) arrangement. Angle α can be about 135 to 145°, and in some aspects about 140°. In some aspects (not shown), the first flat surface 232 and the second flat surface 234 can be spaced apart from each other. Each of the first flat surface 232 and the second flat surface 234 can be substantially rectangular and have a length (along the longitudinal axis of the handle 220) of about 17 to 37 mm, and in some aspects about 27 mm, and a width (transverse to the longitudinal axis of the handle 220) of about 5 to 10 mm, and in some aspects about 7 mm. In other aspects, the first flat surface 232 and the second flat surface 234 can be shapes other than rectangular, such as pill-shaped, oval, trapezoidal, hexagonal, etc.

[0048] In some aspects, each of the first and second planar surfaces 232, 234 can be spaced about 2 to 8 mm, and in some aspects about 5 mm, from the shoulder 228. In some aspects, each of the first and second planar surfaces 232, 234 can be spaced about 5 to 16 mm, and in some aspects about 12 mm, from the proximal end 224.

[0049] Now refer to Figures 3 to 6 , the spring clip 260 extends along a longitudinal axis 262 and is generally tubular in shape (except for protrusions 270, 280). The spring clip 260 includes a slit 264 extending from the proximal end to the distal end to allow the spring clip 260 to switch between a contracted configuration and an expanded configuration. In particular, the slit 264 is narrower in the contracted configuration of the spring clip 260 than in the expanded configuration of the spring clip 260. In some aspects, the distal edge 266 of the spring clip 260 can be beveled. In some aspects, the wall thickness of the spring clip 260 can be between about 1.50 mm and 1.75 mm.

[0050] The spring clip 260 includes one or more internal protrusions extending radially inward from the inner diameter toward the longitudinal axis 262. Figures 3 to 6In the illustrated aspect, the spring clip 260 includes two protrusions 270 and 280 spaced apart along the longitudinal axis 262. The protrusions 270, 280 can be formed by a pressing operation such that the protrusions 270, 280 are recessed into the sidewall of the spring clip 260. In other aspects, the protrusions 270, 280 can include material added to the inner sidewall of the spring clip 260. The protrusion 270 includes a third flat surface 272 and a fourth flat surface 274. The third flat surface 272 and the fourth flat surface 274 can be arranged at an angle β relative to each other (see Figure 5 ). Angle β can be about 136 to 156°, and in some aspects about 146°. Each of the third flat surface 272 and the fourth flat surface 274 can be substantially rectangular and have a length (along the longitudinal axis of the handle 220) of about 7 to 17 mm, and in some aspects about 11 mm, and a width (transverse to the longitudinal axis of the handle 220) of about 4 to 8 mm, and in some aspects about 6 mm. The total length of the protrusions including the third flat surface 272 and the fourth flat surface 274 of the protrusion 270 and the similar flat surfaces of the protrusion 280 can be about 8 to 35 mm, and in some aspects about 27 mm. In other aspects, the third flat surface 272 and the fourth flat surface 274 can be shapes other than rectangular, such as pill-shaped, oval, trapezoidal, hexagonal, etc.

[0051] like Figure 6 As shown, the protrusion 270 of the spring clip 260 interacts with the rotation limiting surface 230 of the handle 220 to limit the rotation of the handle 220 relative to the spring clip 260 in the contracted configuration and the expanded configuration of the spring clip 260. Specifically, the third flat surface 272 of the spring clip 260 is configured to engage the first flat surface 232 of the rotation limiting surface 230 of the handle 220 to limit the rotation of the handle 220 in the clockwise direction 50 within the spring clip 260. Similarly, the fourth flat surface 274 of the spring clip 260 is configured to engage the second flat surface 234 of the rotation limiting surface 230 of the handle 220 to limit the rotation of the handle 220 in the counterclockwise direction 52 within the spring clip 260.

[0052] In some aspects, the angle β of the protrusion 270 of the spring clip 260 is greater than the angle α of the rotation limiting surface 230 of the handle 220. As such, an angular gap θ exists between the first flat surface 232 and the third flat surface 272, and / or between the second flat surface 234 and the fourth flat surface 274. The angular gap θ allows limited rotation of the handle 220 within the spring clip 260. The handle 220 can be rotated in the clockwise direction 50 within the spring clip 260 until the first flat surface 232 of the rotation limiting surface 230 engages the third flat surface 272 of the protrusion 270. Similarly, the handle 220 can be rotated in the counterclockwise direction 52 within the spring clip 260 until the second flat surface 234 of the rotation limiting surface 230 engages the fourth flat surface 274 of the protrusion 270.

[0053] Due to the overall expansion of the spring clip 260, the angle β of the protrusion 270 of the spring clip 260 can be greater when the spring clip 260 is in the expanded configuration compared to the collapsed configuration. Therefore, the handle 220 can have less rotational freedom relative to the spring clip 260 when the spring clip 260 is in the collapsed configuration than when the spring clip 260 is in the expanded configuration.

[0054] Protrusion 280 can be substantially the same as protrusion 270, including third and fourth planar surfaces that are respectively similar to third and fourth planar surfaces 272 and 274. Protrusions 270 and 280 can be separated by a rib 275 that provides rigidity to spring clip 260 and resists deformation of spring clip 260. In some aspects, spring clip 260 can include only a single protrusion 270, without rib 275.

[0055] To accommodate the protrusions 270 and 280, the proximal end 224 of the handle 220 (see Figure 2 ) includes a notch 226 that provides clearance for the protrusions 270, 280 to slide over the proximal end 224 onto the body 222 of the handle 220 when the spring clip 260 is mounted on the handle 220. The notch 226 is shaped to accommodate the protrusions 270, 280. Thus, the notch 226 can include a pair of flat surfaces that respectively allow the third and fourth flat surfaces 272, 274 of the protrusion 270 (together with similar surfaces of the protrusion 280) to slide over the proximal end 224.

[0056] Figure 7 , Figure 8 , Fig. 9A and Fig.10 Another aspect of a cutting drill bit assembly 300 according to the present disclosure is depicted, wherein corresponding components of the cutting drill bit assembly 200 are shown by adding 100 to the reference numerals. Figures 7 to 10 The components described in detail may be assumed to be substantially similar to Figures 2 to 6The corresponding parts of the aspects. Figure 7 , Figure 8 and Fig.10 The cutting tip 310 can be Figures 2 to 6 The cutting tips 210 are substantially the same. Figure 7 As shown, the rotation limiting surface 330 of the body 322 of the handle 320 includes a groove 336 recessed into the body 322. The groove 336 can be about 17 to 37 mm long, in some aspects about 27 mm long, and about 8 to 15 mm wide, in some aspects about 12 mm wide. The groove 336 can be recessed into the body 322 of the handle 320 by about 1 to 5 mm relative to the outer diameter of the body 322, and in some aspects about 2 mm relative to the outer diameter of the body 322. The groove 336 can be spaced about 2 to 8 mm from the shoulder 328, and in some aspects about 5 mm. The groove 336 can be spaced about 5 to 16 mm from the proximal end 324, and in some aspects about 12 mm.

[0057] like Figure 8 , Fig. 9A and Fig.10 As shown, the protrusion 370 of the spring clip 360 includes a tab 376 extending radially inwardly toward the longitudinal axis 362. The illustrated aspect includes two tabs 376, although any number of tabs (such as one, two, three, four, etc.) may be used. The tab 376 may be formed, for example, by a stamping operation to bend the tab 376 inwardly. The tab 376 may be generally symmetrical, as shown, but not necessarily so. The tab 376 may have a length of about 4 to 10 mm (in a direction parallel to the longitudinal axis of the handle 320), and in some aspects about 7 mm. The tab 376 may extend inwardly from the inner side wall of the spring clip 360 by about 1 to 4 mm, and in some aspects about 2 mm. The protrusion 380 may be substantially the same as the protrusion 370. In some embodiments, the spring clip 360 may include only a single protrusion 370.

[0058] like Fig.10 As shown, the tab 376 interacts with the rotation limiting surface 330 in the contracted and expanded configurations of the spring clip 360 to limit the rotation of the handle 320 within the spring clip 360. In particular, the tab 376 extends into the slot 336 of the handle 320 so that rotation of the handle 320 causes the tab to engage the sidewall 338 of the slot 336. In some aspects, as shown in FIG. Fig.10 As shown, there is negligible clearance between the tab 376 and the side wall 338, thereby allowing little or no rotation of the handle 320 relative to the spring clip 360. In other aspects, there can be clearance between the tab 376 and the side wall 338 to allow a limited, predetermined amount of rotation of the handle 320 relative to the spring clip 360.

[0059] like Figure 7and Figure 8 As shown, the notch 326 in the proximal end 324 of the handle 320 may include a single flat surface to allow the tab 376 to pass over the proximal end 324 when the spring clip 360 is mounted to the handle 320 .

[0060] like Figure 8 As shown, the gasket 390 is combined with Figures 2 to 6 The spring clip 360 is maintained in the retracted configuration in the same manner as described.

[0061] Fig. 9B Another aspect of the spring clip 360 is depicted. Fig. 9B The spring clip 360 includes a single protrusion, namely the protrusion 370, which can extend substantially the entire length of the spring clip 360. The protrusion 370 includes a tab 377 extending radially toward the longitudinal axis 362. The tab 377 can be formed by rolling or bending one of the edges of the spring clip 360 on either side of the slit 364. The tab 377 is formed to be in contact with the Fig. 9A The tab 376 of the handle 320 is fitted into the groove 336 in substantially the same manner as the tab 376 of the handle 320 (see Fig.10 ), and the tab 377 engages the side wall 338 of the slot 336 to limit or prevent rotation of the handle 320 relative to the spring clip 360. Fig. 9B The aspect of the present invention includes only a single tab 377, so the groove 336 of the handle 320 can be larger than Fig.10 The slot 336 may be narrow as shown to limit the inclination between the tab 377 and the sidewall 338 of the slot 336. In addition, the slot 336 may extend substantially the entire length of the body 322 of the handle 320 so as to accommodate the tab 377, which extends substantially the entire length of the spring clip 360. That is, the slot 336 may extend substantially the entire distance between the proximal end 324 and the shoulder 328. In other aspects (not shown), the two edges of the spring clip on either side of the slit 364 may be formed as tabs, and the slot 336 of the handle 320 may have a width suitable for accommodating two tabs.

[0062] Figures 11 to 14 Another aspect of a cutting drill bit assembly 400 according to the present disclosure is depicted, wherein corresponding components of the cutting drill bit assembly 200 are shown by adding 200 to the reference numerals. Figures 11 to 14 The components described in detail may be assumed to be substantially similar to Figures 2 to 6 The corresponding parts of the aspects. Figures 11 to 14 The cutting tip 410 may be Figures 2 to 6 The cutting tips 210 are substantially the same. Fig.11 and Fig.13As shown, the rotation limiting surface 430 can include a single flat surface 440 recessed into the body 422. The flat surface 440 can be about 17 to 37 mm long, in some aspects about 27 mm long, about 13 to 16 mm wide, and in some aspects about 15 mm wide. The flat surface 440 can be recessed into the body 422 of the handle 420 by about 2 to 6 mm relative to the outer diameter of the body 422, and in some aspects about 4 mm relative to the outer diameter of the body 422. The flat surface 440 can be spaced about 2 to 8 mm from the shoulder 428, and in some aspects about 5 mm. The flat surface 440 can be spaced about 5 to 16 mm from the proximal end 424, and in some aspects about 12 mm. The flat surface 440 can extend partially around the circumference of the body 422 of the handle 420, such as about 99 to 139° around the circumference of the body 422, and in some aspects about 119° around the circumference of the body 422.

[0063] like Figure 13 to Figure 14 As shown, the cutting drill bit assembly 400 also includes a pin 450 constrained between a spring clip 460 and the rotation limiting surface 430 of the shank 420. The pin 450 is generally cylindrical and aligned parallel to the longitudinal axis of the spring clip 460. The pin 450 can have a length of about 15 to 35 mm, or about 25 mm in some aspects, and a diameter of about 1 to 5 mm, or about 3 mm in some aspects. The spring clip 460 can include an inspection aperture 468 that allows the pin 450 to be viewed through the spring clip 460 so that the operator / installer can verify that the pin 450 is properly located between the spring clip 460 and the flat surface 440 of the shank 420 before and / or during installation of the cutting drill bit assembly 400 into the milling drum 100.

[0064] like Figure 12 to Figure 14 As shown, the protrusions 470, 480 of the spring clip 460 hold the pin 450 in place on the flat surface 440. The protrusions 470, 480 interact with the flat surface 440 via the pin 450 in the contracted and expanded configurations of the spring clip 460 to limit the rotation of the handle 420 within the spring clip 460. The protrusion 470 includes one or more notches 478 extending radially inward to laterally limit the pin 450 on the flat surface 440 of the rotation limiting surface 430. Attempted rotation of the handle 420 relative to the spring clip 460 causes the notches 478 to abut the pin 450 against the flat surface 440, thereby limiting the rotation of the handle 420 relative to the spring clip 460. In various aspects, the notches 478 can be curved, such as Fig.14As shown, or can be substantially flat. Each of the notches 478 can be substantially rectangular and have a length (along the longitudinal axis of the handle 420) of about 6 to 25 mm, and in some aspects about 8 mm, and a width (transverse to the longitudinal axis of the handle 420) of about 3 to 7 mm, and in some aspects about 5 mm. In other aspects, the notches 478 can be shapes other than rectangular, such as pill-shaped, oval, trapezoidal, hexagonal, etc.

[0065] Fig.12 and Fig.14 The washer 490 is shown disposed about the shoulder 428 of the shank 420, which is where the washer 490 is located when the cutting drill assembly 400 is secured in the mounting hole 122 of the tool holder 110. Prior to installation in the tool holder, the washer 490 is disposed in a manner that is in conjunction with the tool holder. Figures 2 to 6 The described manner surrounds the spring clip 460 and holds the spring clip 460 in the retracted configuration.

[0066] Fig.15 Another aspect of a cutting drill bit assembly 400 according to the present disclosure is depicted, which is substantially similar to Figures 11 to 14 aspects. Figures 11 to 14 Corresponding components of the cutting bit assembly 400 are indicated by the same reference numerals. Fig.15 Draws the Fig.13 A cross-sectional view of the cutting bit assembly 400 at the same cross-sectional location of the view. Fig.15 Aspects and Figures 11 to 14 The embodiment of the present invention is different in that the rotation limiting surface 430 includes a convex surface 442 that is recessed into the body 422 of the handle 420. The convex surface 442 may not be coaxial with the rest of the body 422 of the handle 420, and the convex surface 442 may have a radius that is different from (i.e., larger or smaller than) the rest of the body 422 of the handle 420. The protrusion 470 includes a concave surface 479 that is configured to constrain the pin 450 on the convex surface 442. The concave surface 479 of the protrusion 470 may not be coaxial with the rest of the spring clip 460, and the concave surface 479 may have a radius that is different from (i.e., larger or smaller than) the rest of the spring clip 460. The concave surface 479 of the protrusion 470 is configured to interfere with the pin 450 to limit or inhibit rotation of the body 422 of the handle 420 relative to the spring clip 460.

[0067] Fig.16 Another aspect of a cutting drill bit assembly 400 according to the present disclosure is depicted, which is substantially similar to Figures 11 to 14 aspects. Figures 11 to 14 Corresponding components of the cutting bit assembly 400 are indicated by the same reference numerals. Fig.16 Draws the Fig.13 A cross-sectional view of the cutting bit assembly 400 at the same cross-sectional location of the view. Fig.16 Aspects and Figures 11 to 14 The difference is that Fig.16 The rotation limiting surface 430 of the aspect of the present invention includes an integrally formed protrusion 452, rather than the pin 450 as a separate component. The protrusion 452 can extend longitudinally parallel to the flat surface 440. The protrusion 452 can be in the shape of a semi-cylinder, that is, a longitudinally divided cylinder, and can generally be similar to Figures 11 to 14 The pin 450 of the handle 420 interacts with the protrusion 470 of the spring clip 460. Specifically, the protrusion 470 of the spring clip 460 is configured to interfere with the protrusion 452 to limit or prohibit the body 422 of the handle 420 from rotating relative to the spring clip 460.

[0068] Figures 19 to 24 Aspects of a cutting drill bit assembly 500 according to the present disclosure are depicted, which may correspond to Figures 1 to 16 Any of the previously described aspects of Figures 2 to 6 Components of the cutting drill bit assembly 500 of the aspect of the present invention are shown by adding 300 to the reference numerals of the corresponding components. (For example, Figures 19 to 24 The cutting tip 510 corresponds to Figures 2 to 6 The cutting tip 210 is not Figures 19 to 24 The components described in detail may be assumed to be substantially similar to Figures 2 to 6 Similarly, Figures 1 to 16 Components shown but not specifically described may be considered to be substantially similar to Figures 19 to 24 The corresponding parts of the aspects.

[0069] Fig.19 The cutting bit assembly 500 is shown in an installed configuration, wherein the washer 590 abuts the flange 514 of the cutting tip 510. The installed configuration of the washer 590 corresponds to when the cutting bit assembly 500 is inserted into the Figure 1 The position of the washer 590 when it is in the mounting hole 122 of the tool holder 110. In particular, the washer 590 is constrained on the end surface 120 of the tool holder 110 (see Figure 1 ) and the flange 514 of the cutting tip 510. Fig. 20The cutting bit assembly 500 is shown in an unmounted configuration, wherein the washer 590 surrounds the spring clip 560 and holds the spring clip 560 in a retracted configuration. The unmounted configuration of the washer 590 corresponds to the position of the washer 590 prior to installation into the tool holder 110 or after removal from the tool holder 110. For example, the unmounted configuration may correspond to the position of the washer 590 on a new cutting bit assembly 500 supplied to a customer, and / or to the position of the washer 590 after the cutting bit assembly 500 has been removed from the tool holder 110 for reuse.

[0070] like Fig.19 and Fig. 20 As shown, a fillet 516 can be formed between the flange 514 of the cutting drill bit assembly 500 and the shoulder 528 of the shank 520. The fillet 516 can have a radius of, for example, 1.5 mm. In some aspects, the fillet 516 can replace the chamfer, or can be supplemented by the chamfer. The hole 591 of the washer 590 can include a chamfered distal edge 593 that fits over the fillet (or chamfer) 516 to allow the washer 590 to be flush with the flange 514, as shown in FIG. Fig.19 References Figure 22 to Figure 24 Further details of the beveled distal edge 593 of the aperture 591 are described.

[0071] Still reference Fig.19 and Fig. 20 , the proximal edge 518 of the flange 514 can be beveled. The angle 517 of the bevel of the proximal edge 518 (see Fig. 20 ) can be in the range of about 40° to about 80°, and in some aspects about 60°, relative to the longitudinal axis 502 of the cutting bit assembly 500. In some aspects, the proximal edge 518 can have a radius instead of or in addition to the bevel.

[0072] Still reference Fig.19 and Fig. 20 , the distal edge 566 of the spring clip 560 can be tilted to guide the spring clip 560 into the hole 591 of the washer 590, such as when the cutting drill assembly 500 is removed from the mounting hole 122 of the tool holder 110 (see Figure 1 ). In particular, when the cutting drill bit assembly 500 is Fig.19 The installation configuration transitions to Fig. 20 During the unmounted configuration of the handle 520, when the washer 590 slides off the shoulder 528 of the handle 520 and onto the spring clip 560, the distal edge 566 of the spring clip 560 engages the hole 591 of the washer 590. The angle of the bevel of the distal edge 566 relative to the longitudinal axis 562 of the spring clip 560 can be in the range of about 30° and about 60°, and in some aspects is about 45°. In some aspects, the distal edge 566 can have a radius instead of or in addition to the bevel.

[0073] Reference now Fig.21 , depicts a detailed view including the proximal end 524 of the handle 520 and the proximal edge 565 of the spring clip 560. When the spring clip 560 is in a collapsed configuration (i.e., when the washer 590 is as shown in FIG. Fig. 20 The outer diameter of the spring clip 560 is larger than the outer diameter of the proximal end 524 of the handle 520. This allows the proximal end 524 of the handle 520 to slide into the mounting hole 122 of the tool holder 110 (see Figure 1 ), and the spring clip 560 has a slight interference fit with the mounting hole 122. In order to provide a smooth transition between the proximal end 524 of the handle 520 and the spring clip 560, and to guide the spring clip 560 into the mounting hole 122, the distal edge 566 of the spring clip 560 can be beveled. The bevel of the distal edge 566 of the spring clip 560 can have an angle 567 in the range of about 30° and about 60° relative to the vertical outer surface of the spring clip 560, and in some aspects about 45°. In some aspects, instead of or in addition to the bevel, the distal edge 565 of the spring clip 560 can have a radius.

[0074] Reference now Figure 22 to Figure 24 , the washer 590 is a generally annular structure that defines a hole 591 extending through the center of the annular structure along the longitudinal washer axis 581. The diameter 595 of the hole 591 is sized to hold the spring clip 560 in a retracted configuration when the washer 590 is disposed around the spring clip 560, such as Fig. 20 As shown. Thus, the outer diameter of the spring clip 560 in the collapsed configuration is the same as the diameter 595 of the hole 591. In some aspects, the diameter 595 of the hole 591 is in the range of about 18 mm to about 22 mm, and in some aspects is about 20 mm. The washer 590 has an outer diameter 594 in the range of about 40 mm to about 50 mm, and in some aspects is about 44.5 mm. In some aspects, the outer diameter 594 is approximately equal to the outer diameter of the flange 514 of the cutting tip 510 (see Fig.19 and Fig. 20 ).

[0075] Continue to refer Figure 22 to Figure 24 , the proximal edge 592 of the hole 591 may be beveled to help guide the washer 590 onto the spring clip 560, such as when the cutting drill assembly 500 is removed from the tool holder 110 (see Figure 1 ). The angle 582 of the bevel of the proximal edge 592 can be in the range of about 15° to about 45° relative to the longitudinal gasket axis 581, and in some aspects is about 30°. As described above, the distal edge 593 of the hole 591 can be beveled to fit over the fillet (or bevel) 516 of the flange 514 and the handle 520 (see Fig. 20), thereby allowing the gasket 590 to be flush with the flange 514. The angle 583 of the bevel of the distal edge 593 can be in the range of about 30° to about 60° relative to the longitudinal gasket axis 581, and in some aspects is about 45°. In some aspects, the angle 583 of the distal edge 593 is greater than the angle 582 of the proximal edge 592 to accommodate the respective functions of the bevels. In particular, the bevel of the proximal edge 592 is configured to engage the spring clip 560, while the bevel of the distal edge 593 is configured to fit on the fillet 516. In some aspects, each of the proximal edge 592 and / or the distal edge 593 of the hole 591 can have a radius instead of or in addition to the bevel.

[0076] like Fig.23 As shown, the outer distal edge 598 of the gasket 590 can be inclined at an angle 588 in the range of about 40° to about 80° relative to the vertical axis (i.e., an axis parallel to the gasket axis 581), and in some aspects about 60°. The chamfer of the outer distal edge 598 can have a height 599 in the range of about 1 mm to about 2 mm, and in some aspects about 1.3 mm. In some aspects, the outer distal edge 598 can have a radius instead of or in addition to the chamfer.

[0077] like Fig.23 and Fig.24 As shown, the gasket 590 can have an overall thickness 584 in the range of about 3 mm to about 7 mm, and in some aspects about 5 mm. Fig.24 As shown, the thickness 584 of the gasket 590 is equal to the sum of the height 585 of the bevel of the proximal edge 592, the height 586 of the bevel of the distal edge 593, and the height 587 of the vertical sidewall 597 between the bevels of the proximal edge 592 and the distal edge 593. The height 585 of the bevel of the proximal edge 592 can be in the range of 1 mm to 2 mm, and in some aspects is about 1.3 mm. The height 586 of the bevel of the distal edge 593 can be in the range of 1 mm to 2 mm, and in some aspects is about 1.5 mm. The height 587 of the vertical sidewall 597 can be in the range of about 1 mm to about 5 mm, and in some aspects is about 2.2 mm. In some aspects, the height 587 of the vertical sidewall 597 is greater than the height 585 of the bevel of the proximal edge 592, and the height 587 of the vertical sidewall 597 is greater than the height 586 of the bevel of the distal edge 593.

[0078] When the washer 590 is in the uninstalled configuration, the vertical sidewall 597 of the washer 590 engages the outer surface (eg, Fig. 20587). The height 587 of the vertical sidewall 597 can be selected to prevent angular misalignment between the washer 590 and the spring clip 560. That is, the height 587 of the vertical sidewall 597 can maintain the washer axis 581 substantially parallel to the longitudinal axis 562 of the spring clip 560 (see Fig. 20 ). Generally, as the height 587 increases, the vertical sidewall 597 becomes more resistant to misalignment with the spring clip 560. Therefore, for a given thickness 584 of the washer 590, the height 587 of the vertical sidewall 597 is ideally maximized. This can prevent the washer 590 from interfering with the spring clip 560 and / or prevent the washer 590 from being misaligned when inserting the cutting drill bit assembly 500 into the tool holder 110 (see Figure 1 ) during the incomplete seating against the flange 514. However, the height 587 of the vertical side wall 597 is limited by the height 586 of the bevel of the distal edge 593, which must be large enough to provide clearance for the fillet (or bevel) 516 of the flange 514 (see Fig.19 and Fig. 20 ). Additionally, the height 587 of the vertical sidewall 597 can be limited by the height 585 of the slope of the proximal edge 592, which helps guide the spring clip 560 into the aperture 591, as described herein.

[0079] Industrial Applicability

[0080] When installed in a milling drum 100 of a cold milling machine (also known as a road milling machine or scarifier), the disclosed aspects of the cutting drill bit assembly 200 set forth in the present disclosure can be used to mill a surface, such as an asphalt road. As the milling drum 100 rotates, the cutting drill bit assembly 200 breaks up the road surface into small pieces that can be removed from the work site. The interaction between the rotation limiting surface 230 of the shank 220 and the protrusions 270, 280 of the spring clip 260 limits and / or prohibits the cutting drill bit assembly 200 from rotating within the tool holder 110, which can increase the life of the cutting drill bit assembly 200 and / or the tool holder 110. In particular, by limiting or prohibiting the rotation of the cutting drill bit assembly 200, only the cutting side of the cutting tip 210 is subject to significant wear during the milling operation. The non-cutting side of the cutting tip 210 is subject to less significant or negligible wear, and thus provides structural support for the cutting side of the cutting tip 210. Additionally, the lack of significant rotation of the cutting bit assembly 200 results in low or negligible wear on the end face 120 of the tool holder 110 .

[0081] Now refer to Fig.17 , depicts a flow chart of an exemplary method 600 for installing a cutting drill bit assembly 200 in a tool holder 110. The method 600 includes, at step 602, inserting the shank 220 of the cutting drill bit assembly 200 into the mounting hole 122 of the tool holder 110, wherein the spring clip 260 is in a retracted configuration. Figure 3 As shown, the washer 290 surrounds the spring clip 260 to hold the spring clip in the retracted configuration. The proximal end 224 of the handle 220 is first inserted into the mounting hole 122 and pressed into the mounting hole 122 until the washer 290 contacts the end surface 120 of the tool holder 110.

[0082] The method 600 further includes, at step 604, releasing the spring clip 260 from the retracted configuration such that the spring clip 260 applies a radially outward force against the mounting hole 122 of the tool holder 110, thereby locking the spring clip 260 longitudinally and rotationally to the mounting hole 122. Releasing the spring clip 260 at step 604 may be accomplished by fully pressing and / or hammering the shank 220 into the mounting hole 122 of the tool holder 110 such that the washer 290 is pressed onto the shoulder 228 of the shank 220. For example, the shank 220 may be pressed into the mounting hole 122 using an air gun equipped with a mounting cup so as not to damage the cutting tip 210. The washer 290 slides along the outer surface of the spring clip 260 until the washer 290 passes over the spring clip 260, rides over the shoulder 228, and engages the flange 214 of the cutting tip 210. When the spring clip 260 in the contracted configuration is no longer radially restrained by the washer 290, the spring clip 260 radially expands and frictionally engages the mounting hole 122 of the tool holder 110. The inner diameter of the mounting hole 122 is smaller than the outer diameter of the spring clip 260 in the expanded configuration, so the spring bias of the spring clip 260 generates a friction force against the mounting hole 122. Therefore, the spring clip 260 is longitudinally and rotationally locked in the mounting hole 122. In addition, the rotation limiting surface 230 of the shank 220 interacts with the protrusion 270 of the spring clip 260 to limit the rotation of the shank 220, and thus limit the rotation of the cutting tip 210 relative to the spring clip 260 and the mounting hole 122.

[0083] In some aspects, attempted rotation of the cutting tip 210 can increase the grip of the spring clip 260 on the mounting hole 122. Figures 2 to 6 In the aspect of the present invention, the rotation of the handle 220 relative to the spring clip 260 causes the first flat surface 232 of the handle 220 to engage the third flat surface 272 of the spring clip 260, resulting in an increase in the radially outward force applied by the spring clip 260 on the mounting hole 122. In this way, the anti-rotation effect of the spring clip 260 is enhanced. Similarly, the rotation of the handle 220 relative to the spring clip 260 causes the second flat surface 234 of the handle 220 to engage the fourth flat surface 274 of the spring clip 260, resulting in an increase in the force applied by the spring clip 260 on the mounting hole 122.

[0084] As a result of limiting or inhibiting the rotation of the cutting bit assembly 200 during operation of the cold planer, the life of the cutting assembly 200 can be increased by limiting the area of ​​the cutting tip 210 that is subject to wear. In addition, the life of the tool holder 110 can be increased because the wear caused by the rotation of the flange 214 and the washer 290 relative to the end face 120 can be reduced.

[0085] Although combined Figures 2 to 6 The foregoing description of method 600 is described with respect to aspects of the cutting drill bit assembly 200 illustrated in FIG. 1 , but those skilled in the art will appreciate that method 600 may be equally applicable to Figures 7 to 10 Cutting drill bit assembly 300, Figures 11 to 16 The cutting drill bit assembly 400 and / or Figures 19 to 24 Aspects of the cutting drill bit assembly 500. Figures 19 to 24 Various features of the cutting drill bit assembly 500 can facilitate the execution of the method 600. For example, the bevel (or radius) of the proximal edge 565 of the spring clip 560 allows the spring clip 560 to be aligned with the mounting hole 122 ( Figure 1 ) to assist in inserting the cutting bit assembly 500 into the mounting hole 122 at step 602. Thus, the bevel of the proximal edge 565 provides a smooth transition from the proximal end 524 of the shank 520, which can have a clearance fit within the mounting hole 122, to the spring clip 560, which has a light press fit with the mounting hole 122.

[0086] As the washer 590 slides distally along the spring clip 560 toward the shoulder 528 of the handle 520, the sidewall 597 of the hole 591 of the washer 590 remains engaged with the outer surface of the spring clip 560 to prevent the washer 590 from tilting relative to the longitudinal axis 562 of the spring clip 560, thereby preventing interference between the washer 590 and the spring clip 560. When the washer 590 engages the flange 514 of the cutting tip 510, the chamfer (or radius) of the distal edge 593 of the hole 591 fits over the fillet 516 to ensure that the washer 590 is flush with the flange 514.

[0087] Now refer to Fig.18 , depicts a flow chart of an exemplary method 700 for removing a cutting drill bit assembly 200 from a tool holder 110 . The method 700 includes, at step 702 , sliding the shank 220 of the cutting assembly 200 out of the mounting hole 122 of the tool holder 110 .

[0088] The method 700 also includes, at step 704, sliding the washer 290 from the shoulder 228 of the handle 220 onto the spring clip 260 to hold the spring clip 260 in the retracted configuration when the handle 220 is slid out of the mounting hole 122. The beveled distal edge 266 of the spring clip 260 and / or the beveled proximal edge 292 of the washer 290 guide the washer 290 onto the spring clip 260. That is, when the washer 290 is slid over the distal edge 266 of the spring clip 260, the beveled distal edge 266 of the spring clip 260 forces the spring clip 260 into the retracted configuration. Alternatively or additionally, when the washer 290 is slid over the distal edge 266 of the spring clip 260, the beveled proximal edge 292 of the washer 290 forces the spring clip 260 into the retracted configuration.

[0089] Step 704 can be performed at least partially simultaneously with step 702. That is, the washer 290 can be slid onto the spring clip 260 while the shank 220 is slid out of the mounting hole 122. In some aspects, steps 702 and 704 can be performed using a pry tool (not shown) inserted between the washer 290 and the flange 214 of the cutting tip 210. The pry tool separates the washer 290 from the flange 214 and simultaneously slides the shank 220 out of the mounting hole 122. The bevel on the outer diameter of the distal edge 298 of the washer 290 helps insert the pry tool between the washer 290 and the flange 214.

[0090] In some aspects, step 704 is completed when the washer 290 is approximately centered along the length of the spring clip 260, such as Figure 3 or Figure 8 The shank 220 can then be completely removed from the mounting hole 122 without further moving the washer 290. In particular, the shank 220 can be completely removed from the mounting hole 122 without further moving the washer 290 by prying or pulling the flange 214, and without applying significant force on the washer 290. Thus, once the cutting bit assembly 200 has been completely removed from the tool holder 110, the washer 290 holds the spring clip 260 in the retracted configuration so that the cutting bit assembly 200 can be reused (i.e., inserted into another tool holder).

[0091] Although combined Figures 2 to 6 The foregoing description of method 700 is described with respect to aspects of the cutting drill bit assembly 200 illustrated in FIG. 1 , but those skilled in the art will appreciate that method 700 may be equally applicable to Figures 7 to 10 Cutting drill bit assembly 300, Figures 11 to 16 The cutting drill bit assembly 400 and / or Figures 19 to 24 Aspects of the cutting drill bit assembly 500. Figures 19 to 24Various features of the cutting bit assembly 500 may facilitate the execution of the method 700. For example, the bevel (or radius) of the proximal edge 518 of the flange 514 and / or the bevel (or radius) of the outer distal edge 598 of the washer 590 may facilitate inserting a cutter between the flange 514 and the washer 590 during step 702.

[0092] In addition, at step 704, features of the washer 590 and / or the spring clip 560 can help transition the spring clip 560 to the retracted configuration and move the washer 590 to the unmounted configuration. For example, when the washer 590 is slid from the shoulder 528 of the handle 520 onto the spring clip 560, the bevel of the proximal edge 592 of the hole 591 of the washer 590 guides the spring clip 560 into the hole 591. In particular, the bevel of the proximal edge 592 of the washer 590 engages the spring clip 560 and axially aligns the hole 591 of the washer 590 with the spring clip 560 to facilitate smooth sliding of the washer 590 onto the spring clip 560. Alternatively or additionally, the bevel of the distal edge 566 of the spring clip 560 guides the spring clip 560 into the hole 591 of the washer 590 in substantially the same manner. That is, the bevel of the distal edge 566 of the spring clip 560 axially aligns the spring clip 560 with the hole 591 of the washer 590 to facilitate smooth sliding of the washer 590 onto the spring clip 560. Once the washer 590 is engaged with the spring clip 560, the sidewall 597 of the hole 591 slides along the outer surface of the spring clip 560 to prevent the washer 590 from being misaligned (e.g., tilted) relative to the longitudinal axis 562 of the spring clip 560, thereby preventing the washer 590 from interfering with the spring clip 560.

[0093] Aspects of the cutting drill bit assembly 200, 300, 400, 500 of the present disclosure facilitate removal and reuse of the cutting drill bit assembly. For example, when performing a milling operation on a road surface having a metal obstruction (e.g., a manhole cover) that may damage the PCB cutting tip, it may be necessary to remove and reuse the cutting drill bit assembly 200, 300, 400, 500. When used on a road surface having such a metal obstruction, the PCB-based cutting drill bit assembly 200, 300, 400, 500 of the milling drum 100 can be replaced with a non-PCB cutting drill bit assembly. The cutting drill bit assembly 200, 300, 400, 500 can then be reinstalled in the milling drum 100 for milling another road surface that does not have a metal obstruction. To assist in removing the cutting bit assembly 200, 300, 400, 500 from the milling drum 100, the bevel of the proximal edge 518 of the flange 214 and / or the outer distal edge 598 of the washer 590 allows for the insertion of a pry tool for removing the cutting bit assembly 200, 300, 400, 500 from the tool holder 110, as described above. In addition, the bevel of the proximal edge 592 of the hole 591 of the washer 590 and / or the distal edge 566 of the spring clip 560 assists in removing the washer 590 from the mounting configuration ( Fig.19 ) to the Uninstalled Configuration ( Fig. 20 ). In addition, the bevel of the proximal edge 565 of the spring clip 560 helps align the cutting assembly 200, 300, 400, 500 with the tool holder 110 during installation (or reinstallation) of the cutting assembly 200, 300, 400, 500.

[0094] It will be apparent to those skilled in the art that various modifications and variations may be made to the disclosed system without departing from the scope of the present disclosure. Other embodiments of the system will be apparent to those skilled in the art by consideration of the specification and practice of the system disclosed herein. The specification and examples are intended to be considered exemplary only, with the true scope of the present disclosure being indicated by the appended claims and their equivalents.

Claims

1. A cutting drill bit assembly for attachment to a tool holder of a milling type machine, the cutting drill bit assembly comprising: cutting tip; a generally cylindrical shank extending from the cutting tip; a spring clip surrounding the body of the handle and including a collapsed configuration and an expanded configuration; as well as a washer having an installed configuration in which the washer is disposed on the shoulder of the handle and an uninstalled configuration in which the washer surrounds the spring clip and holds the spring clip in the collapsed configuration, Wherein at least one of the distal edge of the spring clip or the proximal edge of the aperture of the washer comprises a bevel or radius. 2 . The cutting drill bit assembly of claim 1 , wherein a proximal edge of the flange of the cutting tip includes a chamfer or radius.

3. The cutting drill bit assembly of claim 1, wherein an outer distal edge of the washer includes a chamfer or radius.

4. The cutting drill bit assembly of claim 1 further comprising a fillet between the shank and the flange of the cutting tip, Wherein a distal edge of the aperture of the washer comprises a chamfer or radius configured to fit over the fillet when the washer is in the installed configuration.

5. The cutting drill bit assembly of claim 1 , wherein the proximal edge of the hole of the washer has a bevel or radius, the distal edge of the hole of the washer has a bevel or radius, and the hole includes a vertical sidewall between the proximal edge and the distal edge.

6. The cutting drill bit assembly of claim 5, wherein the bevel of the distal edge of the bore has a greater angle relative to the longitudinal axis of the washer than the bevel of the proximal edge of the bore.

7. The cutting bit assembly of claim 5, wherein the vertical sidewall engages an outer surface of the spring clip when the washer is in the uninstalled configuration.

8. The cutting bit assembly of claim 5, wherein the height of the vertical sidewall is greater than the height of the bevel or radius of the proximal edge and greater than the height of the bevel or radius of the distal edge.

9. The cutting drill bit assembly of claim 1, wherein the outer diameter of the spring clip in the retracted configuration is greater than the outer diameter of the proximal end of the shank, Wherein the proximal edge of the spring clip has a bevel or radius that transitions between the outer diameter of the spring clip and the outer diameter of the proximal end of the handle.

10. The cutting drill bit assembly of claim 1, wherein the shank includes a rotation limiting surface, and Wherein the spring clip includes a protrusion configured to interact with the rotation limiting surface of the handle to limit rotation of the handle relative to the spring clip.

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