US 12,733,575 B1Granted

Heads for string trimmers and mowers

AssigneeArdisam, Inc.

InventorTyler Michael Tetzlaff

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Abstract

A rotatable cutting head body for holding a cutting line for a string trimmer or mower includes a plurality of passageways, with each passageway extending between two openings at the perimeter of the cutting head body. A cutting line may be installed in the passageways to extend into inlet openings and out from outlet openings, with free ends of the cutting line extending in radially opposite directions away from a rotational axis of the cutting head body. The passageways may be coplanar with each other. The cutting head body may include one or more cutting head disks arranged along the axis, with each disk having the plurality of passageways. The cutting head body may not include moving parts for advancing the cutting line. The cutting head disks may position the cutting line away from an interface between two adjacent cutting head disks.

Claims30

Dependent claims

A cutting head assembly for an agricultural machine, wherein the cutting head assembly comprises a cutting head body configured to receive and hold a cutting line, the cutting head body is rotatable about an axis, and the cutting head body comprises one or more cutting head disks arranged along the axis, wherein, for each cutting head disk of the one or more cutting head disks, the cutting head disk comprises:

(a) a base portion defining a first side and a second side opposite the first side;
(b) a first passageway along the first side, wherein the first passageway extends from a first opening at a perimeter of the cutting head disk, then toward the axis, then diverges away from the axis toward a second opening at the perimeter of the cutting head disk;
and
(c) a second passageway along the first side, wherein the second passageway extends from a third opening at the perimeter of the cutting head disk, then toward the axis, then diverges away from the axis and away from the second opening, toward a fourth opening at the perimeter of the cutting head disk;
wherein:
the fourth opening is opposite the second opening relative to the axis;
the first opening is positioned less than 90 degrees away from the third opening, about an arc along the perimeter of the cutting head disk;
and
wherein the third opening is symmetrically opposed to the first opening relative to a first plane containing the axis.

6 more elements

a first passageway extending from a first opening at a perimeter of the cutting head body toward a second opening at the perimeter of the cutting head body;
and
a second passageway extending from a third opening at the perimeter of the cutting head body toward a fourth opening at the perimeter of the cutting head body;
wherein:
the first passageway diverges away from the second passageway as the first passageway extends toward the second opening and as the second passageway extends toward the fourth opening;
the fourth opening is positioned 180 degrees away from the second opening about an arc centered around the axis;
the second opening is positioned less than 90 degrees away from the first opening, about the arc;
the fourth opening is positioned less than 90 degrees away from the third opening, about the arc;
and
the first passageway is coplanar with the second passageway.

7 more elements

An agricultural system comprising:

a cutting head assembly comprising a cutting head body and a shaft, wherein the shaft is positionable to extend through the cutting head body along a rotational axis of the cutting head body;
and
a means for rotating the cutting head body about the rotational axis;
wherein:
(a) the cutting head body is configured to carry a cutting line, wherein when the cutting head assembly carries the cutting line, and the means for rotating the cutting head body rotates the cutting head body about the axis, (i) a first end portion of the cutting line extends radially away from the cutting head body and the axis along a first direction, and (ii) a second end portion of the cutting line opposite the first end portion extends radially away from the cutting head body and the axis along a second direction opposite the first direction;
(b) the cutting head body comprises a plurality of separate cutting head disks stackable together along the shaft;
and
(c) for each cutting head disk, the cutting head disk comprises:
(i) a first passageway extending from a perimeter of the cutting head disk, toward a radially inward portion of the cutting head disk, then diverging away from the radially inward portion of the cutting head disk toward the perimeter of the cutting head disk;
(ii) a second passageway extending from the perimeter of the cutting head disk, toward the radially inward portion of the cutting head disk, then diverging away from the radially inward portion of the cutting head disk toward the perimeter of the cutting head body, wherein the second passageway is symmetrically opposed to the first passageway relative to a first plane containing the rotational axis;
(iii) a third passageway symmetrically opposed to the first passageway relative to a second plane containing the rotational axis, wherein the second plane is perpendicular to the first plane;
and
(iv) a fourth passageway symmetrically opposed to the third passageway relative to the first plane and symmetrically opposed to the second passageway relative to the second plane.

10 more elements

Dependencies are inferred from the claim text.