US 5,926,961 AGranted

Tree trimmer with telescopic rod

AssigneeAndreas Stihl AG & Co. KG

InventorKlaus-Martin Uhl

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Abstract

A hand-guided working tool has a telescopic rod with a first and a second end. A drive motor is connected to the first end of the telescopic rod. A working tool, connected to the second end of the telescopic rod, is driven by the drive motor. The telescopic rod includes an outer tube and an inner tube inserted with an inner end into the outer tube and displacable in the longitudinal direction of the telescopic rod. A first clamping member is connected to the first end of the outer tube for fixing the axial position of the inner tube. The inner tube has an outer mantle surface and the outer tube has an inner circumferential surface. The outer mantle surface is spaced at a radial distance from the inner circumferential surface. A first cylindrical bearing body is supported on the inner end of the inner tube. The first bearing body is displacably supported in the outer tube. The first clamping member has an inner circumferential guide surface matching the outer mantle surface of the inner tube such that the inner tube is secured coaxially relative to the outer tube by the first clamping member and the first bearing body.

Claims23

Dependent claims

A hand-guided working tool comprising:

a telescopic rod having a first end and a second end;
a drive motor connected to said first end of said telescopic rod;
a working tool connected to said second end of said telescopic rod;
a telescopic drive shaft drivingly connecting said drive motor to said working tool and positioned inside said telescopic rod;
said telescopic rod comprised of an outer tube and an inner tube inserted with an inner end into a first end of said outer tube and displaceable in a longitudinal direction of said telescopic rod;
a first clamping member connected to said first end of said outer tube for fixing an axial position of said inner tube;
said inner tube having an outer mantle surface and said outer tube having an inner circumferential surface;
said outer mantle surface being spaced at a radial distance (a) from said inner circumferential surface;
a first cylindrical bearing body fastened to said outer mantle surface of said inner tube at said inner end;
said first cylindrical bearing body displaceably supported on said inner circumferential surface of said outer tube;
a first inner bearing positioned between said first cylindrical bearing body and said telescopic drive shaft to allow rotation of said drive shaft relative to said first cylindrical bearing body;
said first clamping member having an inner circumferential guide surface matching said outer mantle surface of said inner tube such that said inner tube is secured coaxially relative to said outer tube by said first clamping member and said first cylindrical bearing body;
a second clamping member, a connecting tube, and a second cylindrical bearing body, wherein said outer tube has a second end opposite said first end of said outer tube and said second clamping member is connected to said second end of said outer tube;
said connecting tube inserted with a first end into said second end of said outer tube and having an outer mantle surface;
said second clamping member having an inner circumferential guide surface matching said outer mantle surface of said connecting tube;
said second cylindrical bearing body supported on said outer mantle surface of said connecting tube at said first end of said connecting tube and supported on said inner circumferential surface of said outer tube.

13 more elements

A hand-guided working tool comprising:

a telescopic rod having a first end and a second end;
a drive motor connected to said first end of said telescopic rod;
a working tool connected to said second end of said telescopic rod and driven by said drive motor;
said telescopic rod comprised of an outer tube and an inner tube inserted with an inner end into a first end of said outer tube and displaceable in a longitudinal direction of said telescopic rod;
a first clamping member connected to said first end of said outer tube for fixing an axial position of said inner tube;
said inner tube having an outer mantle surface and said outer tube having an inner circumferential surface;
said outer mantle surface being spaced at a radial distance (a) from said inner circumferential surface;
a first cylindrical bearing body supported on said inner end of said inner tube;
said first cylindrical bearing body displaceably supported in said outer tube;
said first clamping member having an inner circumferential guide surface matching said outer mantle surface of said inner tube such that said inner tube is secured coaxially relative to said outer tube by said first clamping member and said first cylindrical bearing body;
said outer tube having a second end opposite said first end;
a second clamping member connected to said second end of said outer tube;
a connecting tube inserted with a first end into said second end of said outer tube and having an outer mantle surface;
said second clamping member having an inner circumferential guide surface matching said outer mantle surface of said connecting tube;
a second cylindrical bearing body supported on said first end of said connecting tube and supported in said outer tube;
wherein said first cylindrical bearing body is a first bearing sleeve surrounding said inner end of said inner tube and fastened thereto, and wherein said second cylindrical bearing body is a second bearing sleeve surrounding said first end of said connecting tube and fastened thereto.

13 more elements

A hand-guided working tool comprising:

a telescopic rod having a first end and a second end;
a drive motor connected to said first end of said telescopic rod;
a working tool connected to said second end of said telescopic rod and driven by said drive motor;
said telescopic rod comprised of an outer tube and an inner tube inserted with an inner end into a first end of said outer tube and displaceable in a longitudinal direction of said telescopic rod;
a first clamping member connected to said first end of said outer tube for fixing an axial position of said inner tube;
said inner tube having an outer mantle surface and said outer tube having an inner circumferential surface;
said outer mantle surface being spaced at a radial distance (a) from said inner circumferential surface;
a first cylindrical bearing body supported on said inner end of said inner tube;
said first cylindrical bearing body displaceably supported in said outer tube;
said first clamping member having an inner circumferential guide surface matching said outer mantle surface of said inner tube such that said inner tube is secured coaxially relative to said outer tube by said first clamping member and said first cylindrical bearing body;
said outer tube having a second end opposite said first end;
a second clamping member connected to said second end of said outer tube;
a connecting tube inserted with a first end into said second end of said outer tube and having an outer mantle surface;
said second clamping member having an inner circumferential guide surface matching said outer mantle surface of said connecting tube;
a second cylindrical bearing body supported on said first end of said connecting tube and supported in said outer tube;
a first inner bearing positioned inside said first cylindrical bearing body;
a second inner bearing positioned inside said second cylindrical bearing body;
a telescopic drive shaft for drivingly connecting said drive motor to said working tool, said telescopic drive shaft rotatingly supported by said first and second inner bearings.

15 more elements

Dependencies are inferred from the claim text.