Cutting head assembly
AssigneeTrim-A-Lawn Corporation
InventorsJames W. Sutliff, Dallas W. Jones, Lawrence J. Kuhl
Life of this patent
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Abstract
The invention provides a cutting head assembly for a lawnmower, trimmer, or similar device which includes a plurality of lower cutting elements mounted to a disc-shaped support member. A plurality of upper cutting elements are also mounted to the disc-shaped support member at a higher elevation, such that each upper cutting element is directly above a corresponding lower cutting element. This allows for a double cut mulching effect in use. An air foil can be provided with the upper cutting elements to create an upward vacuum which positions the grass for a clean cut by both the upper and lower cutting elements. The cutting elements can comprise cutting blades and/or flexible cutting filaments.
Claims35
A cutting head assembly comprising:
- a disc-shaped support member having a top surface and a bottom surface;
- a first plurality of lower cutting elements mounted about the circumference of said disc-shaped support member and extending therefrom;
- and
- a second plurality of upper cutting elements mounted about the circumference of said disc-shaped support member and extending therefrom, wherein during operation of said cutting head assembly, at least one of said second plurality of upper cutting elements defines a notional cutting plate which is substantially parallel to a notional cutting plate defined by at least one of said first plurality of lower cutting elements.
A cutting head assembly comprising:
- a disc-shaped support member having a top surface and a bottom surface;
- a first plurality of lower cutting elements mounted about the circumference of said disc-shaped support member and extending therefrom;
- a second plurality of upper cutting elements mounted about the circumference of said disc-shaped support member and extending therefrom;
- each of said first plurality of lower cutting elements comprising a cutting blade;
- said cutting blade having a plastic housing with a cutting surface thereon;
- and
- a metal blade inserted within said plastic housing, a portion of said metal blade extending from said plastic housing at said cutting surface.
A cutting head assembly comprising:
- a disc-shaped support member having a top surface and a bottom surface;
- a first plurality of lower cutting elements mounted about the circumference of said disc-shaped support member and extending therefrom;
- a second plurality of upper cutting elements mounted about the circumference of said disc-shaped support member and extending therefrom;
- each of said first plurality of lower cutting elements comprising a cutting blade;
- said second plurality of upper cutting elements comprising a draft inducing cutting blade which comprises a plastic housing having a cutting surface thereon;
- a metal blade inserted within said plastic housing, a portion of said metal blade extending from said plastic housing at said cutting surface;
- and an air foil mounted to said plastic housing.
A cutting head assembly comprising a disc-shaped support member having a top surface and a bottom surface;
- a plurality of cutting elements mounted about the circumference of said disc-shaped support member and extending therefrom;
- wherein the top surface of the disc-shaped support member has a circular lip projecting therefrom, the circular lip being centered on said top surface and positioned at a radius inside of the circumference of the disc-shaped support member, the circular lip for expelling debris generally away from the circumference of the disc-shaped support member.
A cutting head assembly comprising a disc-shaped support member having a top surface and a bottom surface;
- a plurality of cutting elements mounted about the circumference of said disc-shaped support member and extending therefrom;
- wherein the bottom surface of the disc-shaped support member comprises a circular angled surface having an inner radius and an outer radius, the outer radius being inside of the circumference of the disc-shaped support member, the angled surface being centered within said bottom surface and extending outwardly and downwardly from the inner radius to the outer radius, the circular angled surface for expelling debris away from the cutting head assembly.
A cutting head assembly comprising:
- a support member;
- at least one cutting blade pivotably disposed thereon;
- said at least one cutting blade including
- a plastic housing having a cutting surface;
- and
- a metal blade inserted within said plastic housing, a portion of said metal blade extending from said plastic housing at said cutting surface.
A plastic cutting assembly for rotational vegetation cutting comprising a cone-shaped indentation in the center thereof for receiving a correspondingly cone-shaped extension of a shaft for mounting the plastic cutting assembly to the shaft.
Dependencies are inferred from the claim text.