Patent Application
20200154636
Not Applicable
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Not Applicable
The disclosure and prior art relates to reversible blade devices and more particularly pertains to a new reversible blade device for extending the service life of lawn mower blades.
An embodiment of the disclosure meets the needs presented above by generally comprising a lawn mower that has an output shaft. A hub is removably coupled to the output shaft such that the output shaft rotates the hub when the lawn mower is turned on. The hub has a plurality of protrusions thereon radiating outwardly from a center of the hub. A plurality of blades is provided and each of the blades is removably coupled to a respective one of the protrusions such that the hub rotates the blades when the lawn mower is turned on. Each of the blades has a first cutting edge and a second cutting edge. Moreover, each of the blades is reversible on the hub such that a selected one of the first or second cutting edges faces the direction of the hub's rotation thereby enhancing a service life of the blades with respect to cutting.
There has thus been outlined, rather broadly, the more important features of the disclosure in order that the detailed description thereof that follows may be better understood, and in order that the present contribution to the art may be better appreciated. There are additional features of the disclosure that will be described hereinafter and which will form the subject matter of the claims appended hereto.
The objects of the disclosure, along with the various features of novelty which characterize the disclosure, are pointed out with particularity in the claims annexed to and forming a part of this disclosure.
The disclosure will be better understood and objects other than those set forth above will become apparent when consideration is given to the following detailed description thereof. Such description makes reference to the annexed drawings wherein:
With reference now to the drawings, and in particular to
As best illustrated in
The hub 16 has a top surface 20, a bottom surface 22 and a perimeter edge 24 extending outwardly therefrom, the hub 16 has a mounting aperture 26 extending through the top 20 and bottom 22 surfaces and the mounting aperture 26 is centrally positioned on the hub 16. The perimeter edge 24 alternatively curves outwardly from the mounting aperture 26 and inwardly toward the mounting aperture 26 to define the plurality of protrusions 18. The protrusions 18 are evenly spaced apart from each other such that the hub 16 has a triangular cross section taken along a line extending through the top 20 and bottom 22 surfaces. Each of the protrusions 18 has a distal end 28 with respect to the mounting aperture 26. The hub 16 has a plurality of blade apertures 30 each extending through the top 20 and bottom 22 surfaces of the hub 16. Each of the blade apertures 30 is positioned on a respective one of the protrusions 18 and each of the blade apertures 30 is spaced from the distal end 28 of the respective protrusion 18.
A plurality of blades 32 is provided and each of the blades 32 is removably coupled to a respective one of the protrusions 18 such that the hub 16 rotates the blades 32 when the lawn mower 12 is turned on. Each of the blades 32 has a first cutting edge 34 and a second cutting edge 36. Additionally, each of the blades 32 is reversible on the hub 16 such that a selected one of the first 34 or second 36 cutting edges faces the direction of the hub's 16 rotation. In this way the service life of each of the blades 32 is enhancing with respect to cutting grass.
Each of the blades 32 has a primary surface 38, a secondary surface 40 and an outer edge 42 extending therebetween, and the outer edge 42 of each of the blades 32 has a first lateral side 44, a second lateral side 46, a front side 48 and a back side 50. Each of the blades 32 is elongated between the first 44 and second 46 lateral sides. The front side 48 of the outer edge 42 of each of the blades 32 has the first cutting edge 34 thereon angling downwardly from the primary 38 and secondary 40 surfaces of the blades 32. The back side 50 of the outer edge 42 of each of the blades 32 has the second cutting edge 36 thereon and angling upwardly between the secondary 40 and primary 38 surfaces of the blades 32. Each of the blades 32 may be twisted between the first 44 and second 46 lateral sides of the perimeter edge 24.
The first cutting edge 34 on each of the blades 32 faces the hub's 16 direction of rotation when the primary surface 38 of the blades 32 abuts the bottom surface 22 of the hub 16. The second cutting edge 36 on each of the blades 32 faces the hub's 16 direction of rotation when the secondary surface 40 of the blades 32 abuts the bottom surface 22 of the hub 16. Each of the blades 32 has a coupling aperture 52 extending through the primary 38 and secondary 40 surfaces and the coupling aperture 52 on each of the blades 32 is positioned closer to the first lateral side 44 of the blade 32 than the second lateral side 46 of the blade 32.
A plurality of fasteners 54 is provided and each of the fasteners 54 extends through the coupling aperture 52 in a respective one of the blades 32 and engages the blade aperture 30 in a respective one of the protrusions 18. Each of the blades 32 is oriented collinear with a line extending through the mounting aperture 26 in the hub 16 and the distal end 28 of the respective protrusion 18 when the blades 32 are coupled to the hub 16. Additionally, each of the fasteners 54 may comprise a bolt or other releasable mechanical fastener.
In an alternative embodiment 56 as shown in
In use, the output shaft 14 is extended through the mounting aperture 26 in the hub 16 and a nut or other fastener is applied to the output shaft 14 to retain the hub 16 on the output shaft 14. Each of the blades 32 is coupled to a respective one of the protrusions 18 having the first cutting edge 34 on each of the blades 32 facing the direction of the hub 16's rotation. Respective ones of the blades 32 is reversible on the hub 16 having the second cutting edge 36 of the respective blade 32 facing the direction of the hub 16's rotation when the first cutting edge 34 of the respective blade 32 becomes dulled or damaged. In this way the service life of the respective blade 32 is enhanced.
With respect to the above description then, it is to be realized that the optimum dimensional relationships for the parts of an embodiment enabled by the disclosure, to include variations in size, materials, shape, form, function and manner of operation, assembly and use, are deemed readily apparent and obvious to one skilled in the art, and all equivalent relationships to those illustrated in the drawings and described in the specification are intended to be encompassed by an embodiment of the disclosure.
Therefore, the foregoing is considered as illustrative only of the principles of the disclosure. Further, since numerous modifications and changes will readily occur to those skilled in the art, it is not desired to limit the disclosure to the exact construction and operation shown and described, and accordingly, all suitable modifications and equivalents may be resorted to, falling within the scope of the disclosure. In this patent document, the word “comprising” is used in its non-limiting sense to mean that items following the word are included, but items not specifically mentioned are not excluded. A reference to an element by the indefinite article “a” does not exclude the possibility that more than one of the element is present, unless the context clearly requires that there be only one of the elements.
