US4552461A — Stirrer for stirring near a vessel wall

Claim 1

Independent Claim 162 words

A stirrer for stirring near a vessel wall and for directing stirred material toward a vessel drain, the stirrer having a drive shaft, stirrer arms, plates and stirring elements, each stirrer arm being radially arranged on and supported by the drive shaft, each plate being secured to a stirrer arm at a position near the vessel wall and supporting a plurality of stirring elements, and each stirring element being secured to a plate, being positioned between the plate and said vessel wall, having a leading edge, being separated from each other stirring element secured to the same plate and being inclined to direct stirred material toward the vessel drain, the stirring elements attached to a given plate being displaced from each other in the direction of revolution so that the leading edge of each successive stirring element in the direction of the vessel drain and on a plate is behind that of the immediately preceding stirring element in said direction of revolution.

Claim 2

Dependent Claim 162 words

A stirrer for stirring near a vessel wall and for directing stirred material toward a vessel drain, the stirrer having a drive shaft, stirrer arms, plates and stirring elements, each stirrer arm being radially arranged on and supported by the drive shaft, each plate being secured to a stirrer arm at a position near the vessel wall and supporting a plurality of stirring elements, and each stirring element being secured to a plate, being positioned between the plate and said vessel wall, having a leading edge, being separated from each other stirring element secured to the same plate and being inclined to direct stirred material toward the vessel drain, the stirring elements attached to a given plate being displaced from each other in the direction of revolution so that the leading edge of each successive stirring element in the direction of the vessel drain and on a plate is behind that of the immediately preceding stirring element in said direction of revolution.

Claim 3

Dependent Claim 35 words

A stirrer as claimed in claim 1, wherein some of the stirrer arms (3, 3a) are designed as conveying elements (11, 12) which are inclined in a direction opposite that of the stirring elements (5).

Claim 4

Dependent Claim 19 words

A stirrer as claimed in claim 1, wherein the stirrer arms (3) are designed to have a variable length.

Claim 5

Dependent Claim 23 words

A stirrer as claimed in claim 1, wherein each plate (4) is perpendicular to the stirrer arm (3) to which it is secured.

Claim 6

Dependent Claim 22 words

A stirrer as claimed in claim 1, wherein the plate (4) are arranged to be rotatable about their respective stirrer arm axis.

Claim 7

Dependent Claim 24 words

A stirrer as claimed in claim 1 wherein each stirring element is inclined relative to each other stirring element secured to the same plate.

Claim 8

Dependent Claim 33 words

A bottom-discharge vessel having a stirrer as claimed in claim 1 and which further comprises similarly-disposed plates and respective stirring elements adjacent the bottom of the vessel and secured to the drive shaft.

Claim 9

Dependent Claim 18 words

A stirrer as claimed in claim 1 wherein the stirring elements are inclined only slightly from the horizontal.

Claim 10

Dependent Claim 96 words

A stirrer for stirring near a vessel wall and having a drive shaft, stirrer arms, plates, stirring elements and a helix, the stirrer arms being radially arranged and secured to the drive shaft, the plates being secured to said stirrer arms at a position near the vessel wall, a plurality of the stirring elements being at a distance from each other and being secured to each plate in such a way that their shadow areas overlap in the direction of revolution or are at least almost contiguous, and the helix being secured to the drive shaft.

Claim 11

Dependent Claim 96 words

A stirrer for stirring near a vessel wall and having a drive shaft, stirrer arms, plates, stirring elements and a helix, the stirrer arms being radially arranged and secured to the drive shaft, the plates being secured to said stirrer arms at a position near the vessel wall, a plurality of the stirring elements being at a distance from each other and being secured to each plate in such a way that their shadow areas overlap in the direction of revolution or are at least almost contiguous, and the helix being secured to the drive shaft.

Claim 12

Dependent Claim 17 words

A stirrer as claimed in claim 9 wherein the stirring elements are inclined relative to one another.

Claim 13

Dependent Claim 33 words

A stirrer as claimed in claim 9 wherein the stirring elements are positioned to direct stirred material in one direction and the helix is designed to direct stirred material in a different direction.

Annuity Stage	Window Opens	Payment Deadline	Surcharge Period Until	Estimated Fee	Status
3.5 Years (Year 4)	1988-11-11	1989-05-13	1989-11-12	$2000.00	Window Closed / Lapsed
7.5 Years (Year 8)	1992-11-11	1993-05-13	1993-11-12	$3760.00	Window Closed / Lapsed
11.5 Years (Year 12)	1996-11-11	1997-05-13	1997-11-12	$7700.00	Window Closed / Lapsed

Stirrer for stirring near a vessel wall

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