Motorized working apparatus and air filter

Patent metadata

Field	Value
Publication number	US-11619197-B2
Application number	US-202017029439-A
Country	US
Kind code	B2
Filing date	Sep 23, 2020
Priority date	Sep 24, 2019
Publication date	Apr 4, 2023
Grant date	Apr 4, 2023

Abstract

A motorized working apparatus includes a housing having an air inlet, an air guide leading from the air inlet into the housing, and an air filter which is curved hood-shaped outwardly and covers the air inlet of the housing. The air filter includes a filter frame body with a filter-fabric-free air outlet face facing the air inlet of the housing and with a window frame structure protruding over the filter-fabric-free air outlet face and having at least one window region. A filter fabric occupies the at least one window region, and a fixation releasably fixes the filter frame body to the housing. The window frame structure has frame webs which delimit the at least one window region and which protrude relative to the filter fabric towards an air supply side in the at least one window region and include web side edges which run sloping at an obtuse angle relative to adjacent window planes, and/or the fixation includes a pre-fixing clamping holding arrangement and a final fixing holding arrangement which are independent of each other, and/or the window frame structure of the air filter protrudes over the filter-fabric-free air outlet face in the shape of a roof with a triangular cross-sectional form.

First claim

What is claimed is:

1. A motorized working apparatus, comprising:
a housing with an air inlet;
an air guide leading from the air inlet into the housing; and
an air filter which is curved hood-shaped outwardly and covers the air inlet of the housing, and which comprises a filter frame body with a filter-fabric-free air outlet face facing the air inlet of the housing and with a window frame structure protruding over the filter-fabric-free air outlet face and having at least one window region, a filter fabric occupying the at least one window region, and a fixation for releasable fixing of the filter frame body to the housing,
wherein the air filter further comprises at least one of the following features:
(i) the fixation comprises a pre-fixing clamping holding arrangement and a final fixing holding arrangement which are independent of each other, or
(ii) the window frame structure of the air filter protrudes over the filter-fabric-free air outlet face in the shape of a roof with a triangular cross-sectional form.

2. The motorized working apparatus according to claim 1 , further comprising:
a working tool outside the housing and a connecting shaft between the working tool and the housing, wherein the air inlet is situated on a half of the housing facing the working tool.

3. The motorized working apparatus according to claim 1 , wherein
the apparatus is configured for operation in at least one predefined usage position, and
the air inlet covered by the air filter is situated in a region of the housing pointing downward in said predefined usage position.

4. The motorized working apparatus according to claim 1 , further comprising:
an apparatus component to be cooled, situated in the housing; and
a cooling air fan, wherein
the air guide forms a cooling air guide which leads from the air inlet of the housing, via the apparatus component to be cooled and the cooling air fan, to an air outlet of the housing which is situated in a region of the housing between a housing front side and a housing rear side.

5. The motorized working apparatus according to claim 4 , further comprising:
a housing seal which seals the housing at least on a suction side of the cooling air fan against at least one of supply air and dirt ingress except for the air inlet.

6. The motorized working apparatus according to claim 1 , wherein
the window frame structure forms a multisurface structure with at least four air inlet faces adjoining each other at an angle along associated frame side edges.

7. The motorized working apparatus according to claim 6 , wherein
the at least four air inlet faces comprise a quadrangular front inlet face adjoining the air outlet face at an acute angle, a quadrangular bottom inlet face adjoining the front inlet face and adjoining the air outlet face at an acute angle, and two triangular transverse inlet faces each adjoining the air outlet face, the front inlet face and the bottom inlet face.

8. The motorized working apparatus according to claim 1 , wherein
the filter frame body is an injection moulding of a plastic material, and
the filter fabric is a metallic filter fabric which is over-moulded on the edges by the plastic material of the filter frame body.

9. The motorized working apparatus according to claim 1 , wherein
the final fixing holding arrangement is a screw connection with a fixing screw and a screw sleeve which is formed on the filter frame body, and the pre-fixing clamping holding arrangement is formed on a screw sleeve outer periphery, or the fixing screw is captively received in the screw sleeve.

10. An air filter, comprising:
a filter frame body having frame parts enclosing a filter-fabric-free air outlet face, the filter frame body further having a window frame structure protruding from the frame parts above the air outlet face and having at least one window region forming an air inlet face for entering air that is outlet through the air outlet face;
a filter fabric occupying the at least one window region; and
a fixation for releasable fixing of the filter frame body,
wherein the air filter further comprises at least one of the following features:
(i) the fixation comprises a pre-fixing clamping holding arrangement and a final fixing holding arrangement which are independent of each other, or
(ii) the window frame structure of the air filter protrudes over the filter-fabric-free air outlet face in the shape of a roof with a triangular cross-sectional form.

11. The air filter according to claim 10 , wherein
the window frame structure forms a multi-surface structure with at least four air inlet faces adjoining each other at an angle along associated frame side edges.

12. The air filter according to claim 11 , wherein
the at least four air inlet faces comprise a quadrangular front inlet face adjoining the air outlet face at an acute angle, a quadrangular bottom inlet face adjoining the front inlet face and adjoining the air outlet face at an acute angle, and two triangular transverse inlet faces each adjoining the air outlet face, the front inlet face and the bottom inlet face.

13. The air filter according to claim 10 , wherein
the filter frame body is an injection moulding of a plastic material, and
the filter fabric is a metallic filter fabric which is over-moulded on the edges by the plastic material of the filter frame body.

14. The air filter according to claim 10 , wherein
the final fixing holding arrangement is a screw connection with a fixing screw and a screw sleeve which is formed on the filter frame body, and the pre-fixing clamping holding arrangement is formed on a screw sleeve outer periphery, or the fixing screw is captively received in the screw sleeve.

15. The motorized working apparatus according to claim 1 , wherein
the apparatus is a manually guided motorized gardening or forestry working apparatus.

16. The air filter according to claim 10 , wherein
the air filter is configured for being mounted on a motorized working apparatus.

17. A motorized working apparatus, comprising:
a housing with an air inlet;
an air guide leading from the air inlet into the housing;
a working tool outside the housing;
a connecting shaft between the working tool and the housing, wherein the air inlet is situated on a half of the housing facing the working tool; and
an air filter which is curved hood-shaped outwardly and covers the air inlet of the housing, and which comprises a filter frame body with a filter-fabric-free air outlet face facing the air inlet of the housing and with a window frame structure protruding over the filter-fabric-free air outlet face and having at least one window region, a filter fabric occupying the at least one window region, and a fixation for releasable fixing of the filter frame body to the housing,
wherein
the window frame structure has frame webs which delimit the at least one window region and which protrude relative to the filter fabric towards an air supply side in the at least one window region and comprise web side edges which run sloping at an obtuse angle relative to adjacent window planes,
and wherein
the window frame structure forms a multisurface structure with at least four air inlet faces adjoining each other at an angle along associated frame side edges, the at least four air inlet faces comprising a quadrangular front inlet face adjoining the air outlet face at an acute angle, a quadrangular bottom inlet face adjoining the front inlet face and adjoining the air outlet face at an acute angle, and two triangular transverse inlet faces each adjoining the air outlet

Assignees

• Stihl Ag & Co Kg Andreas

Inventors

• Lechner Sebastian
• Maier Alexander

Classifications

• F02M35/02433

  Special alignment with respect to the air intake flow, e.g. angled or in longitudinal flow direction · CPC title

• F02B63/02

  for hand-held tools · CPC title

• A01G3/08

  Other tools for pruning, branching or delimbing standing trees · CPC title

• A01G3/04 Primary

  Apparatus for trimming hedges, e.g. hedge shears · CPC title

• B01D46/0008

  Two or more filter elements not fluidly connected positioned in the same housing · CPC title