A hatch mechanism for a pre-separator or dust extractor filter tank and a dust container holder for mating with such a hatch

Patent metadata

Field	Value
Publication number	US-2023172413-A1
Application number	US-202117924783-A
Country	US
Kind code	A1
Filing date	Jun 4, 2021
Priority date	Jun 11, 2020
Publication date	Jun 8, 2023
Grant date	—

Abstract

A hatch mechanism for a pre-separator 120, the mechanism comprising an aperture having a perimeter arranged in a plane, and at least three elongated obturator elements pivotably attached along the perimeter at respective hinge ends, each obturator element comprising a distal end arranged opposite to the hinge end along the extension direction of the obturator element, wherein adjacent obturator elements arranged along the perimeter are connected by foldable joining members arranged to guide the distal ends to a common intersection point distanced from the plane, whereby the obturator elements are arranged to fold about respective hinge ends to a position of mutual support to close the hatch mechanism.

First claim

1 . A hatch mechanism for a pre-separator or dust extractor filter tank, the mechanism comprising an aperture having a perimeter, and
at least three elongated obturator elements pivotably attached along the perimeter at respective hinge ends, each obturator element comprising a distal end arranged opposite to the hinge end along an extension direction of the obturator element, wherein adjacent obturator elements arranged along the perimeter are connected by foldable joining members arranged to guide the distal ends to a common intersection point distanced from a plane of the aperture, whereby the obturator elements are arranged to fold about respective hinge ends to a position of mutual support to close the hatch mechanism.

2 . The hatch mechanism according to claim 1 , wherein the aperture has a circular or an elliptical shape, or
wherein the aperture has a polygonal shape with number of equal sized faces equal to a number of the obturator elements.

3 . (canceled)

4 . The hatch mechanism according to claim 1 , where six obturator elements are arranged evenly spaced along the perimeter of the aperture.

5 . The hatch mechanism according to claim 1 , wherein the obturator elements each comprise a rigid or semi-rigid batten structure, or
wherein the obturator elements are pivotably attached via a hinge or a resilient portion at the hinge end of each obturator element.

6 . (canceled)

7 . (canceled)

8 . The hatch mechanism according to claim 1 , wherein the foldable joining members are made of a flexible sheet material, or
wherein the foldable joining members are integrally formed as a tubular element in a resilient material, the obturator elements being attached to the tubular element.

9 . The hatch mechanism according to claim 1 , wherein a foldable joining member is arranged with a folding indication configured extending along a line from a point on the perimeter halfway between the adjacent obturator elements towards a geometric center of the aperture.

10 . (canceled)

11 . The hatch mechanism according to claim 1 , wherein the perimeter comprises a rim portion with a first flange and a second flanges extending radially outwards from the rim portion with an axial separation, wherein the first flange and the second flange are configured to mate with a flange portion on a dust container holder extending radially inwards to mate with the first and second flanges.

12 . The hatch mechanism according to claim 1 , further comprising an annular structural support member arranged in connection to the perimeter and transversal to the obturator elements to prevent pivoting by the obturator elements beyond a position of mutual support.

13 . The hatch mechanism according to claim 12 , wherein the annular structural support member is a rigid sheet metal or rigid plastic annular member configured with a frustoconical shape matched to the shape of the elongated obturator elements at the respective hinge ends, or
wherein the annular structural support member has a radially protruding rim portion, the annular structural support member being arranged to be supported on the hatch mechanism by the radially protruding rim portion.

14 . The hatch mechanism according to claim 12 , wherein the annular structural support member is arranged to be held in position in-between the pre-separator and the hatch mechanism, or
wherein the annular structural support member is arranged to be inserted into the hatch mechanism, wherein an external diameter of the annular structural support member matches an internal diameter of the hatch mechanism in vicinity of the perimeter.

15 . (canceled)

16 . The hatch mechanism according to claim 1 , wherein the hatch mechanism is attached to the pre-separator by a plurality of rivets.

17 . (canceled)

18 . A dust container holder for mating with a hatch mechanism, the dust container holder comprising a tubular body extending between a first end perimeter and a second end perimeters, wherein a flange portion extends radially inwards in connection to the first end perimeter, and wherein a groove portion extends radially outwards in connection to the second end perimeter, wherein the groove portion is configured to hold a dust container.

19 . The dust container holder according to claim 18 , arranged to be fitted onto the hatch mechanism by pushing the first end perimeter over the hatch mechanism, wherein the flange portion is configured to hold the dust container in position by entering in-between the first and second flange portions of the hatch mechanism.

20 . The dust container holder according to claim 18 , comprising a protective shroud arranged to at least partly cover the dust container when received in the groove portion.

21 . The dust container holder according to claim 20 , wherein the protective shroud is formed in a resilient material allowing the protective shroud to be folded over a dust container received in the groove portion,
wherein the protective shroud has an outer diameter larger than an outer diameter of the dust container, or wherein the protective shroud has an inner diameter smaller than an inner diameter of the dust container.

22 . (canceled)

23 . (canceled)

24 . The dust container holder according to claim 20 , wherein the protective shroud is formed in rubber or a pliable plastic material,
wherein the protective shroud is formed in a disposable material, wherein the protective shroud is arranged to envelope the pre-separator at an end opposite to the dust extractor lid, and to be elastically held in position relative to the pre-separator, or wherein the dust container holder is configured with an annular shape, and having a U-shaped cross-section.

25 - 29 . (canceled)

30 . A pre-separator for a dust extractor, comprising a hatch mechanism according to claim 1 .

31 . A protective shroud arranged to at least partly cover a dust container received in a groove portion of a dust container holder, wherein the protective shroud is formed in a resilient material allowing the protective shroud to be folded over the dust container when received in the groove portion.

32 . The protective shroud according to claim 31 , where the protective shroud is formed in rubber or a pliable plastic material,
wherein the protective shroud is formed in a disposable material, or wherein the protective shroud is configured with an annular shape, and having a U-shaped cross-section.

33 . (canceled)

34 . The protective shroud according to claim 31 , wherein the protective shroud is arranged to envelope a pre-separator of a dust extractor at an end opposite to a dust extractor lid, and to be elastically held in position relative to the pre-separator.

35 . (canceled)

Assignees

• Husqvarna Ab

Inventors

• Elmestrand Karl
• Sjöberg Axel
• Mesinovic Besim

Classifications

• B01D46/71

  with pressurised gas, e.g. pulsed air · CPC title

• B01D50/20 Primary

  Combinations of devices covered by groups B01D45/00 and B01D46/00 · CPC title

• B01D46/4272

  Special valve constructions adapted to filters or filter elements · CPC title

• A47L9/20

  Means for cleaning filters · CPC title

• A47L9/1418

  Impermeable dust collecting bags · CPC title