Various Improvements to Stump Cutting Tool Discs and Elements Thereof
A rotating disc assembly for use on a stump grinder includes a rotating disc defining a peripheral edge, a first side and a second side, and a central axis positioned through a central position of the rotating disc; a first cutting bit mechanically connected to a first position on the peripheral edge of the rotating disc; and a first shield assembly mechanically connected to a second position on the peripheral edge of the rotating disc in front of the first cutting bit, wherein the first shield assembly comprises a first footprint formed by a first portion extending a first radial distance from the central position and extending a first axial distance from at least the first side or the second side, wherein a footprint of the first cutting bit is at least partially shielded by the first footprint of the first portion of the first shield assembly.
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The present application claims priority to U.S. patent application Ser. No. 14/939555 filed on Nov. 12, 2015, now U.S. Pat. No. 10,051,798, which claims priority to U.S. Provisional Patent Application Ser. No. 62/078,931 filed Nov. 12, 2014, the entirety of each is hereby incorporated by reference herein.
BACKGROUND OF THE INVENTION Field of the InventionThe present invention relates to grinding tools and, more particularly, to outdoor grinding tools, and also more particularly to rotating disc assemblies (including a disc, bit subassembly, and cutting bit shield/guard assembly).
Description of the Related ArtStump cutting tools conventionally include a rotating disc assembly that includes a rotating disc and multiple bit sub-assemblies located at regular angular intervals on the peripheral edge of the rotating disc. For example,
Further, in
In conventional usage, this idea of inclining the front face of the bit, forward or backward or not at all, relative to the footprint-defining viewing vector is called a “rake angle.” Conventionally, rake angle is adjusted by the grinder designer depending on factors such as soil type and/or rotational speed.
For present purposes, the important thing to note is that the footprint of the bit that is, dotted area 112a taken perpendicular to the viewing vector is entirely exposed as the disc rotates in direction R during operation of the grinder. More specifically: (i) no portion of disc 102 is interposed in front of the footprint when viewed from the viewing vector; and (ii) no portion of bit holder 108 or any other element positioned on the rotating disc is interposed in front of the footprint of the bit as its footprint is viewed from the viewing vector. Further, the bit only cuts in the “R” direction.
Description of the Related Art Section Disclaimer: To the extent that specific patents/publications/products are discussed above in this Description of the Related Art Section or elsewhere in this Application, these discussions should not be taken as an admission that the discussed patents/publications/products are prior art for patent law purposes. For example, some or all of the discussed patents/publications/products may not be sufficiently early in time, may not reflect subject matter developed early enough in time and/or may not be sufficiently enabling so as to amount to prior art for patent law purposes. To the extent that specific patents/publications/products are discussed above in this Description of the Related Art Section and/or throughout the application, the descriptions/disclosures of which are all hereby incorporated by reference into this document in their respective entirety(ies).
SUMMARY OF THE INVENTIONThe disclosure is directed to inventive rotating disc assemblies for use on a stump grinder. An embodiment can include, but is not limited to, a rotating disc assembly for use on a stump grinder including: a rotating disc defining a peripheral edge; a first bit holder that is mechanically connected to the peripheral edge of the rotating disc; a first cutting bit that is mechanically connected to and positioned in front of the first bit holder, wherein the first cutting bit is structured, positioned and configured to cut in three directions; and a first shield assembly mechanically connected to a first shoulder formed on the peripheral edge of the rotating disc in front of the first cutting bit so that a footprint of the first cutting bit is at least partially shielded by a corresponding footprint of the first shield assembly.
Another embodiment can include, but is not limited to a rotating disc assembly for use on a stump grinder including: a rotating disc defining a peripheral edge; a first bit holder that is mechanically connected to the peripheral edge of the rotating disc; a first cutting bit that is mechanically connected to and positioned in front of the first bit holder, wherein the first cutting bit is structured, positioned and configured to cut in three directions; and a first shield assembly mechanically connected to the peripheral edge of the rotating disc in front of the first cutting bit so that a footprint of the first cutting bit is at least partially shielded by a corresponding footprint of the first shield assembly, and wherein the first shield assembly comprises a layer of shock absorbing material comprising a lower relative hardness value than surrounding layers of the first shield assembly.
Column 2, line 64-column 13, line 42 and FIGS. 3-86 of U.S. Pat. No. 8,789,566, the disclosure of which is hereby incorporated by references in its entirety, provides some background on particular stump cutting tools and may serve as support for certain aspects of one or more embodiments described herein.
The present invention will be more fully understood and appreciated by reading the following Detailed Description in conjunction with the accompanying drawings, in which:
The present invention will be more fully understood and appreciated by reading the following Detailed Description in conjunction with the accompanying drawings, wherein like reference numerals refer to like components.
Turning to
A purpose of the cutting bit shield/guard assembly 10 is to block a portion of the cutting bit 15 as it cuts in the forward direction (R direction) and in the side to side direction (essentially perpendicular to the R direction). In other words, the footprint of the cutting bit 15 can be shielded by the corresponding footprint of the cutting bit shield/guard assembly 10. The footprint of the cutting bit shield/guard assembly 10 can be configured, structured, and/or attached to the rotating disc 7 to shield at least 50% of the corresponding footprint of the cutting bit 15, and preferably at least 90% of the corresponding footprint of the cutting bit 15.
Turning to
A purpose of the cutting bit shield/guard assembly 10′ is to block a portion of the cutting bit 15′ as it cuts in the forward direction (R direction) and in the side to side direction (essentially perpendicular to the R direction). In other words, the footprint of the cutting bit 15′ can be shielded by the corresponding footprint of the cutting bit shield/guard assembly 10′. The footprint of the cutting bit shield/guard assembly 10′ can be configured, structured, and/or attached to the rotating disc 7′ to shield at least 50% of the corresponding footprint of the cutting bit 15′, and preferably at least 90% of the corresponding footprint of the cutting bit 15′.
Referring to
Ideally, the inclusion of shock absorbing material 20 provides some very minor additional movement of the cutting bit shield/guard assembly 10″ from the point of the shock absorbing material 20 upon impact to preserve the useful life of the cutting bit shield/guard assembly 10″ (prevent fracture, chipping or other damage), while at the same time maintaining the protection of the cutting bit 15 via the cutting bit shield/guard assembly's 10″ positioning, shape, configuration and associated functionality (as discussed above and shown in the previous Figures).
For example, upon a lateral impact, the shock absorbing material 20 is structured, configured, and positioned to allow at least a portion of the cutting bit shield/guard assembly 10″ to move in the direction of the lateral force an amount equal to 5% to 20% of its total width (while at the same time being in position to protect the cutting bit with which it is associated), and then to move back to its original position. Similarly, for example, upon impact from the front of the cutting bit shield/guard assembly 10″, the shock absorbing material 20 is structured, configured, and positioned to allow at least a portion of the cutting bit shield/guard assembly 10″ to move in the direction of the head-on force opposite the rotational force of the rotating disc 7, 7′ in an amount equal to 5% to 20% of its total length, height or combination thereof (while at the same time being in position to protect the cutting bit with which it is associated) and then to move back to its original position. Such movement can be a compressive movement, a movement away from the center of the rotating disc 7, 7′ or a combination thereof. Any of the movement discussed herein is preferably more movement than the cutting bit shield/guard assembly 10″ would have without being damaged if no shock absorbing material 20 was part of the cutting bit shield/guard assembly 10″.
The shock absorbing material can exist in an infinite number of various planar layers within the three dimensional cutting bit shield/guard assembly, in addition to the horizontal planar layers that are shown in
As shown, the shock absorbing material 20 has a particular shape fraction where, for example, the at least one layer of the shock absorbing material 20 extends in a plane with a particular thickness that is not as wide as its length or width.
In an exemplary embodiment, the cutting bits may be made of a carbide material. In additional exemplary embodiment, the shock absorbing material may be made from a rubber with a durometer of about between 80 and 100 (shore A). In an alternative embodiment, the shock absorbing material may be made of a woven metal mesh material, which can be weaved and compressed, and can have the same properties of the shock absorbing material 20 made from the rubber with a particular high durometer. These particular exemplarily compositional configurations are preferably sufficient to meet the particular purposes/functionalities of the shock absorbing material discussed above (i.e., the durometer value and/or the weave and metal wire size of the woven mesh material can change, and long as the purposes/functionalities are met and maintained).
While several embodiments of the invention have been discussed, it will be appreciated by those skilled in the art that various modifications and variations of the present invention are possible. Such modifications do not depart from the spirit and scope of the present invention.
Claims
1. A rotating disc assembly for use on a stump grinder comprising:
- a rotating disc defining a peripheral edge, a first side and a second side, and a central axis positioned through a central position of the rotating disc;
- a first cutting bit mechanically connected to a first position on the peripheral edge of the rotating disc; and
- a first shield assembly mechanically connected to a second position on the peripheral edge of the rotating disc in front of the first cutting bit, wherein the first shield assembly comprises a first footprint formed by a first portion extending a first radial distance from the central position and extending a first axial distance from at least the first side or the second side, wherein a footprint of the first cutting bit is at least partially shielded by the first footprint of the first portion of the first shield assembly.
2. The assembly of claim 1, further comprising a second cutting bit mechanically connected to a third position on the peripheral edge of the rotating disc.
3. The assembly of claim 2, wherein the first shield assembly further comprises a second footprint formed by a second portion extending a second radial distance from the central position and extending a second axial distance from at least the first side or the second side, wherein a footprint of the second cutting bit is at least partially shielded by the second footprint of the second portion of the first shield assembly.
4. The assembly of claim 3, further comprising a third cutting bit mechanically connected to a fourth position on the peripheral edge of the rotating disc.
5. The assembly of claim 4, wherein the first shield assembly further comprises a third footprint formed by a third portion extending a third radial distance from the central position and extending a third axial distance from at least the first side or the second side, wherein a footprint of the third cutting bit is at least partially shielded by the third footprint of the second portion of the first shield assembly.
6. The assembly of claim 5, wherein at least one of the first cutting bit, the second cutting bit and the third cutting bit is structured, positioned and configured to cut in at least two directions.
7. The assembly of claim 6, wherein at least one of the first cutting bit, the second cutting bit and the third cutting bit is structured, positioned and configured to cut in three directions.
8. The assembly of claim 1, wherein the first portion of the first shield assembly tapers in a direction away from the first cutting bit from the first axial distance to a distance less than the first axial distance on at least the first side or the second side.
9. The assembly of claim 8, wherein the first portion of the first shield assembly is cobra head-shaped.
10. The assembly of claim 1, wherein the first shield assembly is wider at a front portion and narrower at a back portion closer to the first cutting bit.
11. The assembly of claim 10, wherein the back portion forms a first surface extending in the radial direction, wherein the first surface intersects a second surface of the first cutting bit extending in the axial direction.
12. The assembly of claim 3, further comprising a channel formed between the first portion of the first shield assembly and the second portion of the first shield assembly.
13. The assembly of claim 1, further comprising a second cutting bit mechanically connected to the first side of the rotating disc.
14. The assembly of claim 13, wherein the first shield assembly further comprises a second footprint formed by a second portion extending a second radial distance from the central position and extending a second axial distance from the first side, wherein a footprint of the second cutting bit is at least partially shielded by the second footprint of the second portion of the first shield assembly.
15. The assembly of claim 13, further comprising a second shield assembly mechanically connected to the first side of the rotating disc.
16. The assembly of claim 15, wherein the second shield assembly further comprises a second footprint extending a second axial distance from the first side, wherein a footprint of the second cutting bit or the footprint of the first cutting bit is at least partially shielded by the second footprint of the second shield assembly.
17. The assembly of claim 1, wherein the first shield assembly is separately mechanically connected to a first shoulder formed on the peripheral edge of the rotating disc.
18. The assembly of claim 1, wherein the first cutting bit further comprises a perimeter portion comprising at least one cutting surface.
Type: Application
Filed: Aug 20, 2018
Publication Date: Dec 13, 2018
Applicant: Leonardi Manufacturing Co., Inc. (Weedsport, NY)
Inventors: Joseph A. Leonardi (Auburn, NY), Bruce C. Jordan (Auburn, NY)
Application Number: 16/105,377