Hand-guided power tool with a guide bar

Patent metadata

Field	Value
Publication number	US-10166691-B2
Application number	US-201715406857-A
Country	US
Kind code	B2
Filing date	Jan 16, 2017
Priority date	Jan 23, 2016
Publication date	Jan 1, 2019
Grant date	Jan 1, 2019

Abstract

A power tool has a sprocket wheel cover mounted on a housing and a guide bar secured between housing and sprocket wheel cover and having a guide groove for a saw chain. The guide bar has a guide slot extending in a longitudinal direction of the guide bar and guiding the guide bar on a guide element for longitudinal movement relative to the housing. The guide bar has a first exterior side extending in a first plane and facing the housing and a second exterior side extending in a second plane and facing the sprocket wheel cover. The guide bar has an oil supply opening extending from the second exterior side into the guide groove and connected by an oil supply channel with an oil supply device. The oil supply channel has a channel section separate from the guide bar and extending from the first to the second plane.

First claim

What is claimed is:

1. A hand-guided power tool comprising:
a housing;
a sprocket wheel cover mounted on the housing;
an oil supply device;
a guide bar secured between the housing and the sprocket wheel cover;
the guide bar comprising a guide groove for a saw chain;
the guide bar comprising a guide slot extending in a direction of a longitudinal center axis of the guide bar and configured to guide the guide bar on a first guide element for slidable movement of the guide bar relative to the housing in a longitudinal direction of the guide bar;
the guide bar comprising a first exterior side facing the housing and a second exterior side facing the sprocket wheel cover, wherein the first exterior side is positioned in a first plane and wherein the second exterior side is positioned in a second plane;
the guide bar comprising an oil supply opening extending from the second exterior side into the guide groove, wherein the oil supply opening is fluidically connected by an oil supply channel with the oil supply device, and wherein the oil supply channel comprises a channel section arranged stationarily relative to the housing, wherein the channel section is configured as a part separate from the guide bar such that the channel section does not move relative to the housing when the guide bar is moved relative to the housing, and wherein the channel section extends at least from the first plane to the second plane.

2. The power tool according to claim 1 , wherein the longitudinal center axis of the guide bar intersects the channel section.

3. The power tool according to claim 1 , wherein the channel section extends through the guide slot.

4. The power tool according to claim 1 , further comprising a second guide element configured as a guide bolt comprising an outer thread for screwing on a fastening nut for fixation of the sprocket wheel cover on the housing.

5. The power tool according to claim 1 , wherein the power tool is a pole pruner and the housing is a gear housing.

6. A hand-guided power tool comprising:
a housing;
a sprocket wheel cover mounted on the housing;
an oil supply device;
a guide bar secured between the housing and the sprocket wheel cover;
the guide bar comprising a guide groove for a saw chain;
the guide bar comprising a guide slot extending in a direction of a longitudinal center axis of the guide bar and configured to guide the guide bar on a first guide element for slidable movement of the guide bar relative to the housing in a longitudinal direction of the guide bar;
the guide bar comprising a first exterior side facing the housing and a second exterior side facing the sprocket wheel cover, wherein the first exterior side is positioned in a first plane and wherein the second exterior side is positioned in a second plane;
the guide bar comprising an oil supply opening extending from the second exterior side into the guide groove, wherein the oil supply opening is fluidically connected by an oil supply channel with the oil supply device, and wherein the oil supply channel comprises a channel section, wherein the channel section is configured as a part separate from the guide bar and extends at least from the first plane to the second plane;
wherein the oil supply channel comprises a receptacle and wherein the channel section of the oil supply channel is embodied at least partially by an extension that projects into the receptacle, wherein the extension is pulled out of the receptacle when the sprocket wheel cover is removed from the housing, and wherein the extension and the receptacle are sealed relative to each other by a seal.

7. The power tool according to claim 6 , wherein the seal is arranged on a circumference of the extension.

8. The power tool according to claim 6 , wherein, when the guide bar is longitudinally moved relative to the housing, the seal is stationarily arranged relative to the housing.

9. The power tool according to claim 6 , wherein the seal is arranged in an area between the second plane and an exterior side of the sprocket wheel cover facing away from the housing.

10. The power tool according to claim 6 , wherein the receptacle is a sleeve.

11. The power tool according to claim 6 , wherein the extension is formed by the first guide element and wherein the channel section is designed as a through opening in the first guide element.

12. A hand-guided power tool comprising:
a housing;
a sprocket wheel cover mounted on the housing;
an oil supply device;
a guide bar secured between the housing and the sprocket wheel cover;
the guide bar comprising a guide groove for a saw chain;
the guide bar comprising a guide slot extending in a direction of a longitudinal center axis of the guide bar and configured to guide the guide bar on a first guide element for slidable movement of the guide bar relative to the housing in a longitudinal direction of the guide bar;
the guide bar comprising a first exterior side facing the housing and a second exterior side facing the sprocket wheel cover, wherein the first exterior side is positioned in a first plane and wherein the second exterior side is positioned in a second plane;
the guide bar comprising an oil supply opening extending from the second exterior side into the guide groove, wherein the oil supply opening is fluidically connected by an oil supply channel with the oil supply device, and wherein the oil supply channel comprises a channel section, wherein the channel section is configured as a part separate from the guide bar and extends at least from the first plane to the second plane;
wherein the sprocket wheel cover comprises an oil supply slot arranged opposite the oil supply opening of the guide bar.

13. The power tool according to claim 12 , wherein the channel section is connected by a connecting channel to the oil supply slot, wherein the connecting channel is open relative to a guide bar contact surface of the sprocket wheel cover.

14. The power tool according to claim 12 , further comprising a tensioning device, wherein the guide bar has a transverse plane which contains the longitudinal center axis of the guide bar and which extends perpendicular to the first and second exterior sides of the guide bar, and wherein the oil supply slot and the tensioning device are arranged on opposite sides of the transverse plane.

Assignees

• Stihl Ag & Co Kg Andreas

Inventors

• Föhrenbach Jan
• Uhl Klaus-Martin

Classifications

• B27B17/144

  with adjustment by at least one threaded screw · CPC title

• A01G3/086

  Chain saws · CPC title

• B27B17/12 Primary

  Lubricating devices specially designed for chain saws · CPC title

• B27B17/14

  Arrangements for stretching the chain saw · CPC title

• A01G3/033

  having motor-driven blades · CPC title