Woodworking – Special-work machine
Patent
1987-10-20
1989-05-09
Bray, W. Donald
Woodworking
Special-work machine
144235, 144241, 241294, 407 33, 407 45, 407 47, 407 51, A01G 2306
Patent
active
048279951
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
This invention relates to improvements to cutting tools and in one particular embodiment to cutting tools for use in apparatus for cutting or grinding tree stumps or the like.
BACKGROUND ART
In my Australian Pat. No. 531,374 and my corresponding U.S. Pat. No. 4,441,534 I disclosed apparatus for cutting or grinding tree stumps which is driven by a chain saw drive motor and which includes a multi-toothed cutting disc for cutting or grinding tree stumps. Preferably and in order to achieve a wider cut, the cutting disc is supported at an inclined angle relative to the shaft so that it undergoes oscillation in use. This arrangement, while being relatively effective, results in wastage of power from the drive motor. Another disadvantage of such arrangements is that the tungsten tipped tooth portions of the cutting disc tend to be frequently broken or damaged in use, necessitating repair which results in downtime of machine and/or high costs.
OUTLINE OF THE INVENTION
It is an object of the present invention to overcome or alleviate at least some of the above disadvantages by providing an improved cutting tool which has a plurality of replacement teeth and which may be efficiently employed to cut or grind tree stumps or the like. Although the the tool of the present invention is particularly suited to apparatus of the type disclosed in my aforesaid patents, it will also be realised that it may be applied to other types of machines for cutting or grinding trees or other substances.
With the above and other objects in view, this invention resides broadly in a cutting tool comprising a support portion adapted to be rotated in use, said support portion being an annular external surface and wherein a plurality of replaceable cutting teeth are disposed on said surface and placed circumferentially there-around. Preferably the cutting teeth are arranged so that the cutting edges thereof transversely overlap so that a wide cut may be achieved. Preferably also the cutting teeth include threaded shanks which threadedly engage with nuts retained in the support body so as to be easily replaceable in the event of damage.
BRIEF DESCRIPTION OF DRAWINGS
In order that the invention may be more readily understood and put into practical effect, reference will now be made to the accompanying drawings which illustrate a preferred embodiment of the invention wherein:
FIG. 1 is a perspective view of a cutting tool according to the present invention;
FIG. 2 is a plan view of the tool illustrated in FIG. 1;
FIG. 3 is a sectional view showing details of the cutting teeth along line A--A of FIG. 1;
FIGS. 4, 5 and 6 illustrate respective side, front and plan views of a preferred form of cutting teeth;
FIGS. 7 and 8 illustrate two forms of apparatus for use with the cutting tool described with reference to FIGS. 1 to 6.
BEST MODE FOR CARRYING OUT THE INVENTION
Referring to FIG. 1, there is illustrated a cutting tool 10 according to the present invention which is adapted to be rotated in use and engage with timber such as a tree stump to cut or grind away at least portion thereof. As shown, cutting tool 10 includes a disc-like hub 11 provided in this instance with a central aperture 12 to permit the tool to be affixed to a rotating shaft or the like and an annular support portion 13 supported co-axially by the hub 11. The annular support portion 13 may comprise a section of pipe of suitable diameter, however it will be realised that many other suitable arrangements may be employed. For example, the hub 11 and annular support 13 may be caste in one piece. In the present embodiment the hub 11 and the annular support portion 13 have been made from an alloy metal using an investment casting technique to cast the hub 11 and annular support portion 13 as an integral body.
A plurality of through-holes 14, in this instance twelve, are formed in the annular support portion 13 to receive respective cutting teeth 15, preferably of the type illustrated in FIGS. 4 to 6. Each through-hole 14 has an outwardly facing hexagon
REFERENCES:
patent: 1646812 (1927-10-01), Davey et al.
patent: 2160525 (1939-05-01), Thornton
patent: 2367841 (1945-01-01), Monroe
patent: 2586955 (1952-02-01), Kaiser
patent: 4441534 (1984-04-01), Wilson
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