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US3888765A - Precision or micro sieve structure - Google Patents

Precision or micro sieve structure Download PDF

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Publication number
US3888765A
US3888765A US361056A US36105673A US3888765A US 3888765 A US3888765 A US 3888765A US 361056 A US361056 A US 361056A US 36105673 A US36105673 A US 36105673A US 3888765 A US3888765 A US 3888765A
Authority
US
United States
Prior art keywords
sieve
annular
groove
bordering
shoulder
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
US361056A
Other languages
English (en)
Inventor
Fredrik Willem Bolk
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Veco Zeefplatenfabriek BV
Original Assignee
Veco Zeefplatenfabriek BV
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Veco Zeefplatenfabriek BV filed Critical Veco Zeefplatenfabriek BV
Application granted granted Critical
Publication of US3888765A publication Critical patent/US3888765A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N15/00—Investigating characteristics of particles; Investigating permeability, pore-volume or surface-area of porous materials
    • G01N15/02—Investigating particle size or size distribution
    • G01N15/0272—Investigating particle size or size distribution with screening; with classification by filtering
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D29/00—Filters with filtering elements stationary during filtration, e.g. pressure or suction filters, not covered by groups B01D24/00 - B01D27/00; Filtering elements therefor
    • B01D29/01—Filters with filtering elements stationary during filtration, e.g. pressure or suction filters, not covered by groups B01D24/00 - B01D27/00; Filtering elements therefor with flat filtering elements
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D29/00—Filters with filtering elements stationary during filtration, e.g. pressure or suction filters, not covered by groups B01D24/00 - B01D27/00; Filtering elements therefor
    • B01D29/01—Filters with filtering elements stationary during filtration, e.g. pressure or suction filters, not covered by groups B01D24/00 - B01D27/00; Filtering elements therefor with flat filtering elements
    • B01D29/012—Making filtering elements
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D29/00—Filters with filtering elements stationary during filtration, e.g. pressure or suction filters, not covered by groups B01D24/00 - B01D27/00; Filtering elements therefor
    • B01D29/96—Filters with filtering elements stationary during filtration, e.g. pressure or suction filters, not covered by groups B01D24/00 - B01D27/00; Filtering elements therefor in which the filtering elements are moved between filtering operations; Particular measures for removing or replacing the filtering elements; Transport systems for filters
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D35/00—Filtering devices having features not specifically covered by groups B01D24/00 - B01D33/00, or for applications not specifically covered by groups B01D24/00 - B01D33/00; Auxiliary devices for filtration; Filter housing constructions
    • B01D35/28—Strainers not provided for elsewhere
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B07—SEPARATING SOLIDS FROM SOLIDS; SORTING
    • B07B—SEPARATING SOLIDS FROM SOLIDS BY SIEVING, SCREENING, SIFTING OR BY USING GAS CURRENTS; SEPARATING BY OTHER DRY METHODS APPLICABLE TO BULK MATERIAL, e.g. LOOSE ARTICLES FIT TO BE HANDLED LIKE BULK MATERIAL
    • B07B1/00—Sieving, screening, sifting, or sorting solid materials using networks, gratings, grids, or the like
    • B07B1/46—Constructional details of screens in general; Cleaning or heating of screens
    • B07B1/48—Stretching devices for screens

Definitions

  • ABSTRACT Lutter Assistant Examiner-Ralph J. Hill Attorney, Agent, or FirmLittlepage, Quaintance, Murphy & Dobyns [57]
  • ABSTRACT A precision micro sieve structure consists of a thin flexible metal sieve surface mounted between two annular bodies axially aligned with each other and connected together. An annular portion of the sieve surface contacts a bordering shoulder which is perpendicular to the axis of rotation of the annular bodies and is clamped therebetween while being made taut by an annular groove on one bordering shoulder and an annular land on the other bordering shoulder axially aligned with the annular groove.
  • the opening of the groove is greater than the sum of the width of the land and twice the thickness of the sieve, while the depth of the groove is greater than the sum of the height of the land and the thickness of the sieve.
  • This invention relates to a precision or micro sieve structure, having a frame comprising two annular bodies substantially in line with each other and mutually connected, and a flexible sieve surface mounted between bordering shoulders of said annular bodies.
  • the invention aims at improving such sieve structures by forming annular bodies having bordering shoulders extending substantially parallel to the plane of the sieve surface, one of the shoulders having an annular raised part or land and the mating shoulder having an annular groove into which the raised part fits with sufficient clearance to permit an edge part of the sieve surface itself to be pressed by the raised part into the groove when moving the annular bodies towards each other tensioning the sieve surface to a flat plane.
  • the raised part has a rounded end face.
  • the groove at its opening is wider than the width of the raised part augmented by two times the thickness of the sieve surface and is deeper than the height of the land. This structural arrangement permits the shoulders to contact the sieve surface in the zone radially within groove and raised part in a clamping manner between them without permanently clamping the sieve surface between the land and groove in the area of the groove.
  • the sieve structure according to the invention is embodied in such a way that at least part of one of the shoulders radially within the annular raised land or groove when in an unloaded condition, makes a small angle to the sieve surface.
  • the shoulder When assembling the sieve structure by moving the annular bodies towards each other, the shoulder will clamp onto the sieve surface tirst with its radial inner edge after the sieve surface has been tensioned by raised part and groove.
  • the inclined shoulder part is provided on a part of one of the annular bodies which, in the axial direction, is relatively thin, so that this shoulder, when clamping the annular bodies onto each other with the sieve surface in between adapts itself to and becomes more parallel to the opposite shoulder.
  • the small angle is preferably about 4.
  • a sieve structure having this feature effectively prevents contaminating material or sieved material from penetrating the space between the annular bodies. Moreover, this feature permits the sieve surface, in the area of the land and groove, to be better relieved from radial stresses.
  • connection between the annular bodies is preferably according to the invention, obtained in such a way that one of the annular bodies has a groove in the outer periphery and the other body has a thin edge of an axially extending part.
  • the thin edge is extended inwardly into said groove by having been swaged there into or by being adapted to be swaged there into in a later stage.
  • the groove is positioned at an axial distance from the sieve surface such that, by widening the groove in the axial direction towards the sieve surface, an edge of an axially extending part of the other annular body may again be swaged into said groove after removing the former swaged edge e.g., on a lathe.
  • the peripheral portion of the sieve which is clamped between the annular bodies is non-porous and of the same thickness as the sieve surface itself but without sieve openings. It is, however, also possible to apply sieve surfaces which have sieve openings in their clamped edge parts, since the sieve surface is conventionally made by cutting it from a continuous perforated plate of larger size. In the latter case it is preferred to position a closed falt thin ring without sieve openings onto the peripheral part of the sieve surface,
  • FIG. 1 is a part axial section to one side of the axis of a sieve structure according to a preferred embodiment of the invention in an intermediary position during assembly.
  • FIG. 2 is the same section in entirely assembled condition.
  • FIG. 3 is a section through part of a sieve with a closed ring in contact therewith for use in a sieve structure according to the invention.
  • the sieve structure consists of three parts, two annular bodies 1 and 2 and a sieve surface 3 between them.
  • Body 1 has a shoulder 4 perpendicular to the axis of the sieve structure and in said shoulder 4 there is an annular continuous raised part or land 5 rounded at its upper surface.
  • this body 1 has a peripheral groove 6 in the outer periphery.
  • the body 2 has an axially protruding thin edge part 7 which engages fittingly around body 1 and which protrudes past the edge of groove 6 such that it may be swaged into said groove.
  • this body 2 has a shoulder part 8 perpendicular to the axis, a continuous groove 9 and a shoulder part 10 radially within said groove, which part 10 is conical and makes a very small angle of approximately 4 to the purely radial position, such that the inner edge 11 during assembly is closest to the shoulder 4 of body 1.
  • the edge 11 is provided at the inwardly extending part 12 of said body which is rather thin, so that in clamping the sieve surface it is able to move away somewhat to bring the shoulder part 10 in a plane substantially perpendicular to the axis.
  • the groove 9 in mounting is positioned opposite the raised part 5, so that the land is adapted to engage into said groove.
  • the sieve surface 3 is very thin and flexible and has, in the embodiment of FIGS. 1 and 2, a closed outer peripheral part, without sieve openings, radially outwardly of the circle indicated by 13.
  • part 12 of body 2 is bent upwardly until shoulder part 10 has taken up a position substantially or entirely perpendicular to the axis of the sieve structure and so it engages the sieve surface 3 over a wider radial area than only by its edge 11, thereby clamping the sieve surface and also obtaining a good seal between the annular parts.
  • the height of the raised part 5 is smaller than the depth of the groove 9.
  • the width of said groove 9 in radial direction is greater than the radial width of the raised part 5 supplemented by two times the thickness of the sieve surface.
  • FIG. 3 shows a sieve surface 3 having sieve openings up to its outer edge 15 all over its surface.
  • a closed thin ring 16 When used in combination with bodies 1 and 2, it is preferred to position a closed thin ring 16 into contact with sieve surface 3, which ring 16 has about the same small thickness as the sieve surface.
  • Such a ring 16 may often be much thinner than one tenth of a millimeter.
  • the ring preferably extends inwardly up to the edge 13 (FIGS. 1 and 2).
  • the bodies 1 and 2 make a mutual piling of such sieve structures onto one another possible, in which one structure is centered into the other, so that it is possible to use a cascade of sieves of different size of the openings, as is known as such.
  • a precision micro structure comprising two annular bodies axially aligned with each other and connected together, a flexible sieve surface mounted therebetween, an annular portion of the sieve surface being in contact with a bordering shoulder on each of the annular bodies, each bordering shoulder being substantially perpendicular to the axis of rotation of the annular bodies, the improvement comprising an annular groove on one bordering shoulder, an annular land on the other bordering shoulder axially aligned with the annular groove and adapted to fit therein, the opening of the groove being greater than the sum of the width of the land and twice the thickness of the sieve, and the depth of the groove being greater than the sum of the height of the land and the thickness of the sieve, whereby the annular portion of the sieve surface is clamped between the bordering shoulders of the annular bodies except in the region of the land and groove.
  • a sieve structure according to claim 1 wherein the portion of one of said bordering shoulders radially within the annular land or groove is angularly displaced with respect to the sieve surface such that its radial inner edge will first contact the sieve surface and then deflect'into a position parallel to the other bordering shoulder.
  • a sieve structure according to claim 1 wherein a first of the annular bodies has a groove in the outer periphery of the body positioned axially remote from the bordering shoulder and the second of the annular bodies has a thin edge extending axially from its outer periphery coaxially over said first annular body and inwardly into said groove.
  • a sieve structure according to claim 1 wherein the peripheral portion of the sieve surface clamped between the bordering shoulders of the annular bodies is the peripheral portion of the sieve surface which is without sieve openings. clamped between the bordering shoulders of the annu- 5.
  • a sieve structure according to claim 1 further lar bodies. comprising a thin, fiat ring positioned in contact with

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  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Biochemistry (AREA)
  • Health & Medical Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Analytical Chemistry (AREA)
  • Physics & Mathematics (AREA)
  • General Health & Medical Sciences (AREA)
  • General Physics & Mathematics (AREA)
  • Immunology (AREA)
  • Pathology (AREA)
  • Dispersion Chemistry (AREA)
  • Combined Means For Separation Of Solids (AREA)
  • Paper (AREA)
US361056A 1972-05-18 1973-05-17 Precision or micro sieve structure Expired - Lifetime US3888765A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
NL7206758A NL167867C (nl) 1972-05-18 1972-05-18 Zeef.

Publications (1)

Publication Number Publication Date
US3888765A true US3888765A (en) 1975-06-10

Family

ID=19816076

Family Applications (1)

Application Number Title Priority Date Filing Date
US361056A Expired - Lifetime US3888765A (en) 1972-05-18 1973-05-17 Precision or micro sieve structure

Country Status (6)

Country Link
US (1) US3888765A (it)
CH (1) CH559068A5 (it)
DE (1) DE2324757C3 (it)
FR (1) FR2185016B1 (it)
GB (1) GB1436898A (it)
NL (1) NL167867C (it)

Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4689147A (en) * 1985-09-27 1987-08-25 Nalge Company Plastic filter assembly
WO1988000500A1 (en) * 1986-07-24 1988-01-28 Flexistack Pty. Ltd. Improved screen construction
US4816153A (en) * 1986-06-17 1989-03-28 Kanzaki Paper Manufacturing Co., Ltd. Frame member for pressurized screening device
US5655666A (en) * 1993-09-15 1997-08-12 Salzmann; Manfred Sieve
US20030153131A1 (en) * 1997-06-19 2003-08-14 Tongbi Jiang Plastic lead frames for semiconductor devices, packages including same, and methods of fabrication
WO2003084649A1 (en) * 2002-04-08 2003-10-16 Tuchenhagen Gmbh Filter module for micro filtration with replaceable micro-sieve and method for assembling a filter module
US20040006955A1 (en) * 1994-11-23 2004-01-15 Donaldson Company, Inc. Reverse flow air filter arrangement and method
US20080257792A1 (en) * 2004-10-14 2008-10-23 Charles Leslie Glover Sieve Frame
US20100330296A1 (en) * 2007-10-24 2010-12-30 Agfa Graphics Nv Radiation curable inkjet fluids and inks improved for photoyellowing
WO2011026879A1 (en) 2009-09-03 2011-03-10 Agfa-Gevaert Frame for supporting a filter membrane
JP2014104424A (ja) * 2012-11-27 2014-06-09 Dalton Corp 振動篩

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2564338B1 (fr) * 1984-05-16 1987-11-06 Kanzaki Paper Mfg Co Ltd Appareil de tamisage
DE3804429A1 (de) * 1988-02-12 1989-08-24 Schleicher & Schuell Gmbh Einmalfilter
FR2710852B1 (fr) * 1993-10-08 1995-12-22 Nevers Ste Electromecanique Filtre d'aspiration notamment pour pompes de carburant disposées dans un réservoir de véhicule et procédé pour sa mise en Óoeuvre.
FR2729872B1 (fr) * 1995-01-30 1998-08-28 Gantois Ets Procede d'assemblage de tamis de controle et tamis ainsi obtenus

Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US232507A (en) * 1880-09-21 Petehs
US622217A (en) * 1899-04-04 Strainer
US1138741A (en) * 1914-06-10 1915-05-11 Crown Mill Equipment Company Separator.
US1488671A (en) * 1921-08-05 1924-04-01 Cash A W Co Strainer
US2042106A (en) * 1934-05-12 1936-05-26 Charlotte S Knight Filter faucet
US2197435A (en) * 1937-02-08 1940-04-16 Edward H Niemeyer Screen mounting
US3047153A (en) * 1959-04-20 1962-07-31 Alex A Zelinski Foundry riddle
US3286338A (en) * 1964-02-04 1966-11-22 Nicholas J Bohr Method for tensioning sieves

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
BE364693A (it) *
US3288287A (en) * 1963-09-10 1966-11-29 Herbert C Rhodes Sifter and lifter for flour and the like
DE6925695U (de) * 1969-06-26 1969-11-13 Haver & Boecker Pruefsiebrand

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US232507A (en) * 1880-09-21 Petehs
US622217A (en) * 1899-04-04 Strainer
US1138741A (en) * 1914-06-10 1915-05-11 Crown Mill Equipment Company Separator.
US1488671A (en) * 1921-08-05 1924-04-01 Cash A W Co Strainer
US2042106A (en) * 1934-05-12 1936-05-26 Charlotte S Knight Filter faucet
US2197435A (en) * 1937-02-08 1940-04-16 Edward H Niemeyer Screen mounting
US3047153A (en) * 1959-04-20 1962-07-31 Alex A Zelinski Foundry riddle
US3286338A (en) * 1964-02-04 1966-11-22 Nicholas J Bohr Method for tensioning sieves

Cited By (16)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4689147A (en) * 1985-09-27 1987-08-25 Nalge Company Plastic filter assembly
US4816153A (en) * 1986-06-17 1989-03-28 Kanzaki Paper Manufacturing Co., Ltd. Frame member for pressurized screening device
WO1988000500A1 (en) * 1986-07-24 1988-01-28 Flexistack Pty. Ltd. Improved screen construction
US5368169A (en) * 1986-07-24 1994-11-29 Flexistack Pty Ltd Screen construction
US5655666A (en) * 1993-09-15 1997-08-12 Salzmann; Manfred Sieve
US20040006955A1 (en) * 1994-11-23 2004-01-15 Donaldson Company, Inc. Reverse flow air filter arrangement and method
US20040148913A2 (en) * 1994-11-23 2004-08-05 Donaldson Company, Inc. [reverse flow air filter arrangement and method]
US7455707B2 (en) 1994-11-23 2008-11-25 Donaldson Company, Inc. Reverse flow air filter arrangement and method
US20030153131A1 (en) * 1997-06-19 2003-08-14 Tongbi Jiang Plastic lead frames for semiconductor devices, packages including same, and methods of fabrication
WO2003084649A1 (en) * 2002-04-08 2003-10-16 Tuchenhagen Gmbh Filter module for micro filtration with replaceable micro-sieve and method for assembling a filter module
EP1354621A1 (en) * 2002-04-08 2003-10-22 TUCHENHAGEN GmbH Filter module for micro filtration with replaceable micro-sieve and method for assembling a filter module
US20080257792A1 (en) * 2004-10-14 2008-10-23 Charles Leslie Glover Sieve Frame
US20100330296A1 (en) * 2007-10-24 2010-12-30 Agfa Graphics Nv Radiation curable inkjet fluids and inks improved for photoyellowing
US8227047B2 (en) 2007-10-24 2012-07-24 Agfa Graphics Nv Radiation curable inkjet fluids and inks improved for photoyellowing
WO2011026879A1 (en) 2009-09-03 2011-03-10 Agfa-Gevaert Frame for supporting a filter membrane
JP2014104424A (ja) * 2012-11-27 2014-06-09 Dalton Corp 振動篩

Also Published As

Publication number Publication date
DE2324757C3 (de) 1982-07-15
NL7206758A (it) 1973-11-20
FR2185016B1 (it) 1978-11-03
DE2324757A1 (de) 1973-11-29
DE2324757B2 (de) 1980-05-14
GB1436898A (en) 1976-05-26
NL167867C (nl) 1982-02-16
FR2185016A1 (it) 1973-12-28
NL167867B (nl) 1981-09-16
CH559068A5 (it) 1975-02-28

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