Tool head for a hand-guided implement and implement having a tool head

Patent metadata

Field	Value
Publication number	US-11310959-B2
Application number	US-201916441206-A
Country	US
Kind code	B2
Filing date	Jun 14, 2019
Priority date	Jun 22, 2018
Publication date	Apr 26, 2022
Grant date	Apr 26, 2022

Abstract

A tool head for a hand-guided implement possesses two rotatably mounted tools, wherein a first tool is drivable via a first linkage and a second tool is drivable via a second linkage. The tools are drivable so that they rotate back and forth in opposite directions about a common rotational axis. The first linkage possesses a first drive member coupled to a first coupling member pivotably about a first link axis. The first coupling member is coupled to the first tool pivotably about a second link axis. The second linkage possesses a second drive member coupled to a second coupling member pivotably about a third link axis. The second coupling member is coupled to the second tool pivotably about a fourth link axis. The rotational axis of the tools and the coupling drive axis span a center plane, which runs between the second link axis and the fourth link axis.

First claim

I claim:

1. A tool head for a hand-guided implement, comprising: a first rotatably mounted tool; a second rotatably mounted tool; a first linkage; and a second linkage, wherein the first tool is drivable via the first linkage and wherein the second tool is drivable via the second linkage, wherein the tools are drivable via the linkages so as to rotate back and forth in opposite directions about a common rotational axis, wherein the first linkage comprises a first drive member and a first coupling member and wherein the second linkage comprises a second drive member and a second coupling member, wherein the first drive member and the second drive member are mounted rotatingly about a common coupling drive axis, wherein the first drive member is coupled to the first coupling member pivotably about a first link axis, and wherein the first coupling member is coupled to the first tool pivotably about a second link axis, wherein the second drive member is coupled to the second coupling member pivotably about a third link axis, and wherein the second coupling member is coupled to the second tool pivotably about a fourth link axis, wherein the first drive member has a first drive member axis that connects the coupling drive axis to the first link axis, and wherein the second drive member has a second drive member axis that connects the coupling drive axis to the third link axis, wherein an angle between the first drive member axis and the second drive member axis is greater than 0°, and wherein the rotational axis of the tools and the coupling drive axis span a center plane, wherein the center plane runs between the second link axis and the fourth link axis.

2. The tool head according to claim 1 , wherein the angle between the first drive member axis and the second drive member axis is smaller than 180°.

3. The tool head according to claim 1 , wherein the first coupling member has a first coupling member axis that connects the first link axis to the second link axis, and the second coupling member has a second coupling member axis that connects the third link axis to the fourth link axis, wherein the two linkages are arranged so that a first drive angle between the first drive member axis and the first coupling member axis, and a second drive angle between the second drive member axis and the second coupling member axis, is equal for each setting of the linkages.

4. The tool head according to claim 1 , further comprising a transmission including a drive pinion and a ring gear, wherein the ring gear is connected in a rotationally secure manner to the drive members of the linkages.

5. The tool head according to claim 4 , wherein the ring gear has a radius at least 3.5 times a distance of the first link axis from the coupling drive axis.

6. The tool head according to claim 4 , wherein at least one portion of the ring gear is arranged between the drive members and the tools.

7. The tool head according to claim 4 , wherein the drive pinion meshes with the ring gear, and the drive pinion has a connecting contour for a rotationally secure connection to a drive shaft of an implement.

8. The tool head according to claim 1 , further comprising an output member that couples at least one of the coupling members to an assigned one of the tools, wherein the output member is connected in a rotationally secure manner to the assigned tool.

9. The tool head according to claim 8 , wherein the output member is pivotable through less than 360° about the rotational axis.

10. The tool head according to claim 1 , wherein the first tool is fixed to a sleeve and the second tool is fixed to a shaft which projects through the sleeve.

11. The tool head according to claim 1 , wherein at least one of the tools has at least one cutting edge, which, upon each movement in one direction, brushes over two counter edges of the other of the tools.

12. An implement, comprising: a drive motor having a drive shaft; and a tool head including a drive pinion, a first rotatably mounted tool, a second rotatably mounted tool, a first linkage and a second linkage, wherein the first tool is drivable via the first linkage and the second tool is drivable via the second linkage, wherein the tools are drivable via the linkages so as to rotate back and forth in opposite directions about a common rotational axis, wherein the first linkage comprises a first drive member and a first coupling member and wherein the second linkage comprises a second drive member and a second coupling member, wherein the first drive member and the second drive member are mounted rotatingly about a common coupling drive axis, wherein the first drive member is coupled to the first coupling member pivotably about a first link axis, and wherein the first coupling member is coupled to the first tool pivotably about a second link axis, wherein the second drive member is coupled to the second coupling member pivotably about a third link axis, and wherein the second coupling member is coupled to the second tool pivotably about a fourth link axis, wherein the first drive member has a first drive member axis that connects the coupling drive axis to the first link axis, and wherein the second drive member has a second drive member axis that connects the coupling drive axis to the third link axis, wherein an angle between the first drive member axis and the second drive member axis is greater than 0°, and wherein the rotational axis of the tools and the coupling drive axis span a center plane, wherein the center plane runs between the second link axis and the fourth link axis, wherein the drive shaft is connected in a rotationally secure manner to the drive pinion of the tool head.

13. The implement according to claim 12 , wherein the drive pinion, during operation, is drivable at a rotation speed of at least 5,000 revolutions per minute.

14. The implement according to claim 13 , wherein the drive motor has a motor output shaft, wherein the motor output shaft has a rotation speed equal to the rotation speed of the drive pinion.

15. A tool head for a hand-guided implement, comprising: at least one rotatably mounted tool, wherein the at least one tool is drivable so as to rotate back and forth about a rotational axis, wherein the tool has a cutting plane; and a stand component that has a peripheral wall that projects through the cutting plane, wherein the tool head has a socket configured to accept a guide tube, wherein the stand component is arranged on a side of the socket that, during operation, faces ground, wherein the peripheral wall is bounded in a peripheral direction by a first end face and a second end face, wherein the end faces, in the cutting plane, form an angle of less than 60° about the rotational axis, and wherein the peripheral wall between the first end face and the second end face has at least one recess that extends into the cutting plane and separates two portions of the peripheral wall from one another.

Assignees

• Stihl Ag & Co Kg Andreas

Inventors

• Geromiller Ludwig

Classifications

• A01D34/76

  Driving mechanisms for the cutters · CPC title

• A01G3/067

  Motor-driven shears for lawns · CPC title

• A01D34/56

  Driving mechanisms for the cutters · CPC title

• A01D34/90

  for carrying by the operator · CPC title

• H02K7/116

  with gears · CPC title