Patent US4382557A successfully refreshed from Google Patents.
US4382557A
Expired / Lapsed
US
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Method and apparatus for de-aerating viscous mixing stock
Assignee: Draiswerke GmbH
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Filing: 1980-05-12
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Granted: 1983-05-10
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Expires: 2000-05-12
Abstract
Abstract A de-aerating agitating mill, especially for paints, pigments and the like in which the mixing chamber is closed off from a discharge chamber which may be subjected to reduced pressure. The closure is effected by a separator device consisting of a central disk which is attached to the stirrer or agitator shaft and rotates in a hole within a stationary part of the casing. A narrow, annular gap between the periphery of the disk and the rim of the hole acts as an outlet channel through which the ground or mixed stock is extruded. The shear stresses exerted on the stock rupture the material and burst any air bubbles which are then removed by the vacuum.
Inventors
- 👤 Herbert Duerr
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 06:06
CPC Classifications
B; B02; B02C; B02C17/00; B02C17/16
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
138 words
A method for de-aerating viscous stock, especially pasty paint, comprising the steps of: grinding said stock in a grinding chamber where said stock is not subject to vacuum pressure; providing an exit slot for said stock from said grinding chamber into a discharge chamber, providing vacuum pressure in said discharge chamber, and configuring said exit slot such that it prevents the vacuum pressure from entering said grinding chamber; said slot forming said stock into a layer as it exits said grinding chamber; it said slot being defined by a pair of surfaces and progressively increasing in traverse width moving from said grinding chamber to said discharge chamber; about an axis moving at least one of said surfaces during grinding and said surfaces are both inclined radially outwardly of said axis of said motion of said slot defining surfaces.
Claim 2
Independent Claim
138 words
A method for de-aerating viscous stock, especially pasty paint, comprising the steps of: grinding said stock in a grinding chamber where said stock is not subject to vacuum pressure; providing an exit slot for said stock from said grinding chamber into a discharge chamber, providing vacuum pressure in said discharge chamber, and configuring said exit slot such that it prevents the vacuum pressure from entering said grinding chamber; said slot forming said stock into a layer as it exits said grinding chamber; it said slot being defined by a pair of surfaces and progressively increasing in traverse width moving from said grinding chamber to said discharge chamber; about an axis moving at least one of said surfaces during grinding and said surfaces are both inclined radially outwardly of said axis of said motion of said slot defining surfaces.
Claim 3
Dependent Claim
27 words
The method of claim 1, wherein said stock expands as it moves through said slot into said discharge chamber to thereby burst air bubbles in said stock.
Claim 4
Dependent Claim
26 words
The method of claim 1 or 2, wherein the radially outermost one of said surfaces is inclined further off said axis than is the companion surface.
Claim 5
Dependent Claim
29 words
The method of claim 1 or 2, wherein the outermost one of said surfaces is stationary and the companion surface moves with the grinding means in said grinding chamber.
Claim 6
Dependent Claim
172 words
A closed agitating mill, comprising a cylindrical container for grinding stock, said cylindrical container surrounding a grinding chamber; means for supplying stock to said grinding chamber; a rotatably drivable agitator disposed in said grinding chamber; a separator device disposed in said container between said grinding chamber and a discharge chamber, said separator device including an exit slot through which said stock is forced from said grinding chamber, means to provide vacuum in said discharge chamber, and said slot being so configured that it prevents the vacuum pressure from entering said grinding chamber; said slot forming said stock into a layer as it exits said grinding chamber; said slot being relatively elongated between said chambers and progressively increasing in traverse width moving from said grinding chamber to said discharge chamber; said slot being defined by a pair of surfaces at least one of which moves with respect to the other about an axis; and said surfaces are both inclined radially outwardly of said axis of said relative motion of said slot defining surfaces.
Claim 7
Dependent Claim
172 words
A closed agitating mill, comprising a cylindrical container for grinding stock, said cylindrical container surrounding a grinding chamber; means for supplying stock to said grinding chamber; a rotatably drivable agitator disposed in said grinding chamber; a separator device disposed in said container between said grinding chamber and a discharge chamber, said separator device including an exit slot through which said stock is forced from said grinding chamber, means to provide vacuum in said discharge chamber, and said slot being so configured that it prevents the vacuum pressure from entering said grinding chamber; said slot forming said stock into a layer as it exits said grinding chamber; said slot being relatively elongated between said chambers and progressively increasing in traverse width moving from said grinding chamber to said discharge chamber; said slot being defined by a pair of surfaces at least one of which moves with respect to the other about an axis; and said surfaces are both inclined radially outwardly of said axis of said relative motion of said slot defining surfaces.
Claim 8
Dependent Claim
39 words
An agitating mill according to claim 5, wherein said separator device includes a central disk attached to said agitator, the periphery of said central disk and a stationary part of said cylindrical container cooperating to define said elongated slot.
Claim 9
Dependent Claim
45 words
An agitating mill according to claim 6, wherein said stationary part defines a circular hole substantially containing said central disk, the inner periphery of said stationary part and the outer periphery of said central disk together defining an annular channel serving as said elongated slot.
Claim 10
Dependent Claim
40 words
An agitating mill according to claim 5, wherein the width of said elongated slot widens progressively from its narrowest point at said grinding chamber to its widest point at said discharge chamber, an amount of from 10 to 20 times.
Claim 11
Dependent Claim
22 words
An agitating mill according to claim 5 or claim 8, wherein the length of said elongated slot is 20 to 70 mm.
Claim 12
Dependent Claim
25 words
An agitating mill according to claim 9, wherein the width of said elongated slot at its narrowest point is from 0.165 mm to 1.0 mm.
Claim 13
Dependent Claim
32 words
An agitating mill according to one of claims 5, 6, 7, or 8, wherein the radially outermost one of said surfaces is inclined further off said axis than is the companion surface.
Claim 14
Dependent Claim
26 words
An agitating mill according to claim 10 wherein the radially outermost one of said surfaces is inclined further off said axis than is the companion surface.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1986-05-09 | 1986-11-08 | 1987-05-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-05-09 | 1990-11-08 | 1991-05-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-05-09 | 1994-11-08 | 1995-05-10 | $7700.00 | Window Closed / Lapsed |