Handheld work apparatus

Patent metadata

Field	Value
Publication number	US-10434586-B2
Application number	US-201715816797-A
Country	US
Kind code	B2
Filing date	Nov 17, 2017
Priority date	Nov 22, 2016
Publication date	Oct 8, 2019
Grant date	Oct 8, 2019

Abstract

A handheld work apparatus has a motor unit, a tool unit and an outrigger having a carrier part. The outrigger connects the motor unit to the tool unit. The carrier part has a base plate having an inner side and an outer side. A drive shaft and a driven shaft are arranged transversely to the base plate. The carrier part has a first stiffening structure, which rises from the inner side of the base plate toward a space diagonal. On the outer side of the base plate, a second stiffening structure rises toward the same space diagonal, wherein the first stiffening structure and the second stiffening structure conjointly form a spatially diagonally running stiffening element.

First claim

What is claimed is:

1. A portable handheld work apparatus comprising:
a motor unit;
a work tool unit;
an outrigger connected to said work tool unit;
said outrigger including a carrier part;
said carrier part having a base plate defining an inner side and an outer side facing toward said motor unit;
said base plate having a periphery;
said carrier part including a peripheral wall at said periphery for delimiting said base plate;
said peripheral wall having a predetermined length and being configured to rise exclusively from said inner side of said base plate over at least 50% of said predetermined length;
a drive shaft running rotatably driven about a first axis transverse to said base plate;
a driven shaft running parallel to said drive shaft and being rotatably journalled about a second axis;
said carrier part defining a coordinate system having an x-axis, a y-axis and an origin (O);
said x-axis defining a connecting line interconnecting said first and second axes when viewed onto said carrier part along said first axis;
said y-axis being arranged perpendicularly to said connecting line and to said first axis and to run midway between said first axis and said second axis;
said coordinate system having four quadrants on said inner side and four quadrants on said outer side with first segments (A, B, C, D) of said carrier part being disposed in corresponding ones of said inner side four quadrants and second segments (E, F, G, H) of said carrier part being disposed in corresponding ones of said outer side four quadrants;
said carrier part having at least one spatial diagonal which runs through one of the segments on said outer side and one of said segments on said inner side with said one segment on said outer side lying opposite to said one segment on said inner side with reference to said origin (O) of said coordinate system;
at least a first reinforcement structure rising from said inner side of said base plate to said one spatial diagonal; and,
at least a second reinforcement structure rising from said outer side of said base plate to said one spatial diagonal so as to cause said first reinforcement structure and said second reinforcement structure to conjointly define a spatial diagonal composite reinforcement structure.

2. The portable handheld work apparatus of claim 1 , wherein at most 30% of the surface of said base plate on both said inner side and said outer side has reinforcement structures in the same wall section of said base plate.

3. The portable handheld work apparatus of claim 1 , wherein said first reinforcement structure and said second reinforcement structure each have a part region which has no reinforcement structure and is configured as a continuous region having a surface content of at least 2 cm 2 ; and, the part regions are arranged in the same wall section on respective opposite-lying sides of said base plate.

4. The portable handheld work apparatus of claim 1 , further comprising first and second partial stiffening structures; and, wherein said first and second reinforcement structures have a net height (n 1 , n 2 , n 3 , n 4 , n 5 , n 6 , n 7 , n 8 , n 9 ); said net height (n 1 , n 2 , n 3 , n 4 , n 5 , n 6 , n 7 , n 8 , n 9 ) is the sum of the heights (h 1 , h 2 , h 3 , h 4 ) of said first and second partial stiffening structures on mutually opposite-lying sides of one and the same wall section of said base plate with said heights (h 1 , h 2 , h 3 , h 4 ) being measured parallel to said first axis; said second partial stiffening structure rises on said outer side of said base plate and is considered with a negative sign; said first partial stiffening structure rises on said inner side of said base plate and is considered with a positive sign; and, the net height (n 1 , n 2 , n 3 , n 4 , n 5 , n 6 , n 7 , n 8 , n 9 ) of said first and second reinforcement structures, which rise to said spatial diagonal, change sign along said spatial diagonal and are zero in at least one point having a distance (a, b) of at most 2 cm to said origin (O) of said coordinate system.

5. The portable handheld work apparatus of claim 1 , wherein said one spatial diagonal is a first spatial diagonal; and, said first spatial diagonal and said x-axis conjointly define an angle (α) lying in a range of 20° to 70° when viewed in the direction of said first axis.

6. The portable handheld work apparatus of claim 5 , further comprising a second spatial diagonal; and, said second spatial diagonal and said x-axis conjointly defining an angle (β) lying in a range of −20° to −70° when viewed in the direction of said first axis.

7. The portable handheld work apparatus of claim 1 , wherein said base plate has a first opening for accommodating said drive shaft extending therethrough; said base plate has a second opening for accommodating said driven shaft extending therethrough; and, said peripheral wall has first and second peripheral wall sections lying on mutually opposite edges of said base plate with reference to said connecting line.

8. The portable handheld work apparatus of claim 7 , wherein said spatial diagonal composite reinforcement structure extends from said first peripheral wall section to said second peripheral wall section in a region between said first axis and said second axis and from one side of the base plate to the other side of said base plate with the two sides of said base plate being the inner and outer sides of said base plate, respectively.

9. The portable handheld work apparatus of claim 7 , wherein said base plate has a region without reinforcement structures next to said second opening; and, said region without reinforcement structures extends from said first peripheral wall section to said second peripheral wall section.

10. The portable handheld work apparatus of claim 9 , wherein said one spatial diagonal is a first spatial diagonal and said carrier part has a second spatial diagonal; each one of said spatial diagonals intersects one of said peripheral wall sections at a first intercept and the other of said peripheral wall sections at a second intercept; and, said first intercept is at a distance (c, d) to said first opening of less than the diameter (e, f) of at least one of said first and second openings and said region without reinforcement structures runs between said second intercept and said second opening.

11. The portable handheld work apparatus of claim 10 , wherein said second opening is configured on a bearing eye surrounded by an annularly-shaped wall.

12. The portable handheld work apparatus of claim 11 , wherein a reinforcement structure is arranged on said annularly-shaped wall and extends to said peripheral wall; and, said region without reinforcement structures connects to said reinforcement structure arranged on said annularly-shaped wall.

13. The portable handheld work apparatus of claim 7 , wherein at least one of said reinforcement structures includes a reinforcement rib rising linearly-shaped from said base plate.

14. The portable handheld work apparatus of claim 13 , wherein at least one of said reinforcement structures includes a reinforcement pocket rising area-wise from said base plate.

15. The portable handheld work apparatus of claim 13 , wherein a plurality of said reinforcement structures includes respective reinforcement pockets rising area-wise from said base plate; and, at least half of said reinforcement pockets rise from said outer side.

16. The portable handheld work apparatus of claim 14 , wherein said spatial diagonal composite reinforcement structure includes at least one reinforcement rib and at least one reinforcement pocket; a

Assignees

• Stihl Ag & Co Kg Andreas

Inventors

• Geromiller Ludwig

Classifications

• B23D29/02 Primary

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• B25F5/02 Primary

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