Arrangement for fastening a cutting head; portable work appliance having an arrangement for fastening a cutting head

Patent metadata

Field	Value
Publication number	US-2019327888-A1
Application number	US-201916396270-A
Country	US
Kind code	A1
Filing date	Apr 26, 2019
Priority date	Apr 27, 2018
Publication date	Oct 31, 2019
Grant date	—

Abstract

An arrangement includes an output shaft, a cutting head, at least one cutting tool arranged on the cutting head, and a hood. The cutting head is mounted on the output shaft by a screw element held in a rotationally fixed manner on the cutting head. The hood is held on the output shaft in a rotationally fixed manner, and has ribs in the inner region, and a first grip region in the outer region.

First claim

I claim:

1 . An arrangement comprising: an output shaft; a cutting head; at least one cutting tool arranged on the cutting head; a screw element held in a rotationally fixed manner on the cutting head, wherein the cutting head is mounted on the output shaft by the screw element; and a hood, the cutting head and the hood, during operation, being driven in rotation about a rotation axis, the hood being divided in a radial direction starting from the rotation axis into an inner region and an outer region that adjoins the inner region, wherein the inner region has a width, measured radially in relation to the rotation axis, corresponding to at least 3 times a width of the outer region, measured radially in relation to the rotation axis, wherein the hood is held directly on the output shaft in a rotationally fixed manner, and wherein the hood has ribs in the inner region and a first grip surface in the outer region.

2 . The arrangement according to claim 1 , wherein the hood has a pot shape.

3 . The arrangement according to claim 1 , wherein the hood has an inner side that delimits an interior space, the cutting head being accommodated, at least partly, in the interior space.

4 . The arrangement according to claim 3 , wherein the hood has an outer side opposite the inner side, wherein the ribs are only on the outer side of the hood.

5 . The arrangement according to claim 3 , wherein the hood has a bearing contact surface on the inner side, wherein the bearing contact surface tension the hood on the output shaft.

6 . The arrangement according to claim 5 , wherein the cutting head is tensioned with full surface contact against the bearing contact surface of the hood.

7 . The arrangement according to claim 5 , wherein the hood has a length, measured in a direction of the rotation axis, and the bearing contact surface is arranged approximately at half of the length of the hood.

8 . The arrangement according to claim 3 , wherein the inner side of the hood and the cutting head contact each other in a sealing manner at a sealing surface.

9 . The arrangement according to claim 1 , wherein the hood is a fan wheel.

10 . The arrangement according to claim 1 , wherein the hood comprises a hub arranged in a rotationally fixed manner on the hood, wherein the hub provides a positive-engagement connection between the hood and the output shaft.

11 . The arrangement according to claim 1 , wherein the first grip surface overlaps the cutting head in a direction of the rotation axis.

12 . The arrangement according to claim 11 , wherein the first grip surface overlaps an entire length of the cutting head.

13 . The arrangement according to claim 1 , wherein the hood, along the first grip surface, has clearance in relation to the cutting head, in the radial direction starting from the rotation axis.

14 . The arrangement according to claim 1 , further comprising a second grip surface on the cutting head, wherein the first grip surface of the hood and the second grip surface on the cutting head are freely accessible.

15 . A portable work appliance comprising: a front housing; and an arrangement according to claim 1 , wherein the other region of the hood projects out of the front housing.

16 . The work appliance according to claim 15 , the front housing projects over the ribs of the hood in a direction of the rotation axis.

Assignees

• Stihl Ag & Co Kg Andreas

Inventors

• Rethaber Achim

Classifications

• A01D34/63

  having cutters rotating about a vertical axis · CPC title

• A01D34/67

  hand-guided by a walking operator · CPC title

• A01D34/78

  electric · CPC title

• A01D34/82

  Other details · CPC title

• A01D34/416

  Flexible line cutters · CPC title