US3825178A - Centrifuge rotor - Google Patents

Centrifuge rotor Download PDF

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Publication number
US3825178A
US3825178A US00209272A US20927271A US3825178A US 3825178 A US3825178 A US 3825178A US 00209272 A US00209272 A US 00209272A US 20927271 A US20927271 A US 20927271A US 3825178 A US3825178 A US 3825178A
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US
United States
Prior art keywords
wall
tube
rotor
recess
extending
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
US00209272A
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English (en)
Inventor
D Burg
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.)
American Hospital Supply Corp
Baxter Healthcare Corp
Original Assignee
American Hospital Supply Corp
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 American Hospital Supply Corp filed Critical American Hospital Supply Corp
Priority to US00209272A priority Critical patent/US3825178A/en
Priority to DE2419865A priority patent/DE2419865A1/de
Priority to GB1953774A priority patent/GB1423334A/en
Priority to CA199,345A priority patent/CA996525A/en
Priority to CH650374A priority patent/CH581502A5/xx
Priority to FR7416765A priority patent/FR2270945B1/fr
Priority to BE144345A priority patent/BE815067A/xx
Application granted granted Critical
Publication of US3825178A publication Critical patent/US3825178A/en
Assigned to BAXTER TRAVENOL LABORATORIES, INC. A CORP. OF DE reassignment BAXTER TRAVENOL LABORATORIES, INC. A CORP. OF DE MERGER (SEE DOCUMENT FOR DETAILS). EFFECTIVE ON 11/25/1985 ILLINOIS Assignors: AMERICAN HOSPITAL SUPPLY CORPORATION INTO
Assigned to BAXTER INTERNATIONAL INC. reassignment BAXTER INTERNATIONAL INC. CHANGE OF NAME (SEE DOCUMENT FOR DETAILS). EFFECTIVE ON 10/17/1988 Assignors: BAXTER TRAVENOL LABORATORIES, INC., A CORP. OF DE
Assigned to BAXTER DIAGNOSTICS INC. reassignment BAXTER DIAGNOSTICS INC. ASSIGNMENT OF ASSIGNORS INTEREST. Assignors: BAXTER HEALTHCARE CORPORATION
Assigned to BAXTER HEALTHCARE CORPORATION, A CORP. OF DE reassignment BAXTER HEALTHCARE CORPORATION, A CORP. OF DE ASSIGNMENT OF ASSIGNORS INTEREST. Assignors: BAXTER INTERNATIONAL INC., A CORP. OF DE
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
    • F16K11/00—Multiple-way valves, e.g. mixing valves; Pipe fittings incorporating such valves
    • F16K11/02—Multiple-way valves, e.g. mixing valves; Pipe fittings incorporating such valves with all movable sealing faces moving as one unit
    • F16K11/08—Multiple-way valves, e.g. mixing valves; Pipe fittings incorporating such valves with all movable sealing faces moving as one unit comprising only taps or cocks
    • F16K11/083—Multiple-way valves, e.g. mixing valves; Pipe fittings incorporating such valves with all movable sealing faces moving as one unit comprising only taps or cocks with tapered plug
    • F16K11/0836—Multiple-way valves, e.g. mixing valves; Pipe fittings incorporating such valves with all movable sealing faces moving as one unit comprising only taps or cocks with tapered plug having all the connecting conduits situated in more than one plane perpendicular to the axis of the plug
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B04—CENTRIFUGAL APPARATUS OR MACHINES FOR CARRYING-OUT PHYSICAL OR CHEMICAL PROCESSES
    • B04B—CENTRIFUGES
    • B04B5/00—Other centrifuges
    • B04B5/04—Radial chamber apparatus for separating predominantly liquid mixtures, e.g. butyrometers
    • B04B5/0407—Radial chamber apparatus for separating predominantly liquid mixtures, e.g. butyrometers for liquids contained in receptacles
    • B04B5/0414—Radial chamber apparatus for separating predominantly liquid mixtures, e.g. butyrometers for liquids contained in receptacles comprising test tubes

Definitions

  • ABSTRACT A fixed angle centrifuge rotor is provided which can [73] Assgnee' i g fl be molded from a single cavity mold with no seconorpora vanston dary operations.
  • the rotor includes a central hub por- [22] Filed: Dec. 17, 1971 tion and a generally frusto-conical outer portion ex- 7 tending downwardly and radially outwardly from the [21] Appl 209272 central portion for holding the tubes to be centrifuged.
  • the frusto-conical portion is provided with a plurality [52] U.S. Cl.
  • a tube positioned within a recess is held se- [56] References Cited curely by a pair of bottom wall portions and a pair of UNITED STATES PATENTS top wall portions, but' at any cylindrical cross section 3,235,173 2/1966 Unger 233/26 x through the frusto'comcal wall the tube held by only Primary ExaminerGeorge H. Krizmanich a top wall or a bottom wall.
  • Fixed angle centrifuge rotors generally include a central hub portion for attaching the rotor to the centrifuge and an outer tube-holding portion for holding a plurality of generally radially extending tubes at an angle to the plane of rotation.
  • the fabrication of such rotors generally required a plurality of steps including secondary or finishing operations such as drilling the holes for the tubes.
  • the invention provides a rotor which can be molded is a single operation in asingle cavity mold and does not require secondary operations.
  • the rotor can therefore be produced very economically, and the resultant integrally molded structure has characteristic high structural integrity.
  • FIG. 1 is a top perspective view of a centrifuge rotor which is formed in accordance with the invention and which is holding a number of tubes to be centrifuged;
  • FIG. 2 is a top plan view of the centrifuge rotor without the tubes;
  • FIG. 3 is an elevational view of the rotor
  • FIG. 4 is a sectional view taken along the line 4-4 of FIG. 2;
  • FIG. 5 is an enlarged fragmentary view of a portion of FIG. 4 showing a tube positioned in one of the tubeholding recesses of the rotor;
  • FIG. 6 is a bottom plan view of the rotor
  • FIG. 7 is a fragmentary sectional view taken along the line 77 of FIG. 4.
  • FIG. 8 is a fragmentary sectional view taken along the line 8-8 of FIG. 4.
  • the numeral 10 designates generally a centrifuge rotor having a generally circular configuration.
  • the rotor includes a generally circular central hub portion 11 having a central opening 12 and a generally frusto-conical outer tube wall.
  • a cylindrical attaching sleeve 17 of metal or other suitable material is secured within the cylindrical wall 16 and provided with diametrically opposed key ways or slots 18 which permit the rotor to be secured for rotation with the rotary drive shaft of the centrifuge.
  • a cylindrical wall-or rib 20 extends generally perpendicularly upwardly from the outer periphery of the hub portion and is provided with a plurality of circumferentially spaced openings 21 adjacent the hub portion.
  • a frusto-conical wall 22 extends outwardly and downwardly from the cylindrical wall 20 adjacent the upper ends of the openings 21 and is interrupted by a plurality of slots, recesses, or openings 23 which are aligned with the openings 21 and which extend parallel to the radial direction of the rotor, i.e., the slots 23 extend in planes which pass through the center of the hub and which extend vertically in FIGS. 3 and 4.
  • the frusto-conical wall 22 terminates at a second cylindrical wall or rib 24 which extends concentrically with the inner cylindrical wall 20 and which is also provided with a plurality of circumferentially spaced openings 25 which are aligned with the slots 23 and openings 21.
  • a generally V- shaped end or outer wall 27 is connected to the bottom of the outer cylindrical wall 24 and includes an upwardly and outwardly inclined frusto-conical portion 28 and a generally cylindrical outer portion 29.
  • a generally U-shaped tube-supporting wall 30 extends between each adjacent pair of the interrupted portions of the frusto-conical wall 22 to provide a bottom support for each of the tubes. Referring to FIG.
  • eachsupporting wall 30 includes a pair of side wall portions 31 which extend downwardly from the frustoconical wall 22 and an arcuate central or bottom wall portion 32 which extends outwardly and downwardly relative to the hub portion.
  • each bottom wall 30 includes an inner end 33 which terminates slightly outwardly of the outer surface of the cylindrical wall 20 and an outer end 34 which terminates slightly inwardly of the inner surface of the outer cylindrical wall 24.
  • the outer periphery of the planar wall 15 of the hub terminates inwardly of the inner surface of the cylindrical wall 20 adjacent the openings 21 therein as at 35, and the end wall 27 terminates outwardly as at 36 of the outer surface of the cylindrical wall 24 adjacent the openings 25 therein.
  • eachU-shaped wall 30 provides longitudinally extending side and inclined bottom support for the tube and the cylindrical walls 20 and 24 at the upper ends of the openings 21 and 25 therethrough provide top retaining walls.
  • the upper ends of these openings are arcuately shaped and have inclined surfaces which extend parallel with the cylindrical outer surface of the tube 14 when supported by the bottom wall 32 for mating engagement with the cylindrical tube, and each pair of side walls 31 and the side portions of the openings 21 and 25 are spaced apart approximately the diameter of the tube.
  • the tube is thereby received relatively snugly in the recess and is secured against movement in any transverse direction.
  • a tube containing material to be centrifuged may be inserted into each recess by inserting the tube closed end first through an opening 21 in the inner cylindrical wall 20 at the same inclination as the bottom wall 32.
  • the tube is pushed along the bottom wall until the closed end 14a thereof passes through the opening 25 and engages the inclined frusto-conical wall 28 (FIG.
  • the frusto-conical wall 28 extends generally transversely to the axis of the tube to provide an abutment or stop for the closed end of the tube, and the tube is thereby secured against outward movement under the influence of centrifugal force as the rotor rotates.
  • the inner cylindrical wall with a substantial axial extent above the frusto-conical wall 22 to protect the inner ends of the tubes and to provide a convenient portion for gripping and lifting the rotor.
  • the axial length of the wall 20, the angle of inclination and the length of the tubes, and the radius of the hub are such that each tube can be inserted and withdrawn without interference from the other tubes.
  • the rotor does not include any vertically spaced parts, i.e., parts which are spaced in the axial direction of any cylindrical cross section taken about the center of the rotor. Accordingly, it will be apparent that the rotor can be molded in a single shot by a single cavity two-part mold, relative movement of the two mold parts being in the axial direction of the rotor. The rotor can thereby be molded in a single operation, and no finishing or secondary operation such as drilling or milling are required to provide the tube-receiving recesses.
  • the tubular attaching sleeve 17 can be positioned in the stationary mold half before the molding operation so that the rotor is molded in place around the sleeve. If desired, port or recess identification numbers or other indicia can be formed on the frustoconical wall 22 adjacent each recess by the mold.
  • the rotor can be molded either from thermoplastic or thermosetting resin material or from metal.
  • the structure can be described in other ways and various portions of the rotor can be replaced by equivalent structures.
  • the retaining surfaces for the tubes which are provided by the continuously extending cylindrical walls 20 and 24 can be provided by relatively short cross ribs or the like which extend only across the openings in the frusto-conical wall 22 between the side walls 31.
  • the frusto-conical wall could then be joined directly to the outer wall 27.
  • the tenn recess is meant to include any space into which the tube can be inserted longitudinally and in which the tube is restrained against transverse movement in any direction and is not to be limited to a space which is defined by longitudinally extending walls.
  • a molded centrifuge rotor comprising a generally circular generally horizontally extending central hub portion adapted to be connected to a centrifuge and an annular tube-holding portion extending outwardly from the hub portion, the tube-holding portion being provided with a plurality of recesses extending outwardly from the hub portion, each recess adapted to receive an elongated tube and being defined by a pair of opposed side walls, a bottom wall extending between the side walls and being spaced from the hub portion, and a top wall spaced upwardly from the bottom wall to permit a tube to be inserted between the top wall and the bottom wall, the top wall'extending between the side walls in vertical alignment with the spacing between the bottom wall and the hub portion, no portion of the top wall being in vertical alignment with any portion of the bottom wall whereby a tube may be secured against transverse movement within each recess and the rotor may be formed in one operation by molding.
  • the rotor of claim 1 in which the hub portion is generally planar and has top and bottom surfaces and the tube-holding portion is generally frusto-conical, the recesses extending radially outwardly and downwardly from the hub portion at circumferentially spaced locations along the periphery of the hub portion.
  • each recess has an inner end spaced from the hub portion and an outer end
  • the rotor including a second top wall for each recess spaced upwardly from the bottom wall to permit a tube to be inserted between the second top wall and the bottom wall, each second top wall extending between the side walls of the associated recess outwardly of the outer end of the associated bottom wall so that no portion of the second top wall is vertically aligned with any portion of the bottom wall.
  • the rotor of claim 1 including an end wall for each recess engageable with the outer end of a tube received by the recess for preventing outward movement of the tube.
  • the rotor of claim 1 including connecting portions extending between the side walls of each adjacent pair of recesses.
  • a molded centrifuge rotor comprising a generally circular generally horizontally extending central hub portion adapted to be connected to a centrifuge and having upper and lower surfaces and a generally annular tube-holding portion extending outwardly and downwardly from the hub portion, the tube-holding portion having a generally frusto-conical wall provided with a plurality of openings, each opening in the frustoconical wall extending in a vertical plane passing through the center of the hub portion, a generally U- shaped tube-supporting wall extending downwardly from the frusto-conical wall at each opening therein and having an inner end spaced from the hub portion and an outer end, a pair of spaced-apart cross members extending across each opening in the frusto-conical wall, one of the cross members of each pair being positioned vertically above the space between the inner end of the associated tube-supporting wall and the hub portion and'the other cross member of each pair being po- I sitioned outwardly of the outer end of the associated tube-support
  • each of the cross members has an arcuate lower surface for mating with the other surface of a cylindrical tube.
  • the rotor of claim 10 including a generally circularly extending outer wall spaced outwardly of said other cross members and secured to the frusto-conical wall for preventing outward movement of the tubes beyond the outer wall as the rotor is rotated.
  • a molded centrifuge rotor comprising a generally circular central hub portion adapted to be connected to a centrifuge and an annular tube-holding portion extending outwardly from the hub portion, the tubeholding portion being provided with a plurality of recesses extending outwardly from the hub portion, each recess adapted to receive an elongated tube and being defined by a pair of opposed side retaining means on the tube-holding portion for restraining sideways movement of the tube, bottom retaining means on the tubeholding portion having an inner end spaced from the hub portion for restraining downward movement of the tube, and top retaining means on the tube-holding portion positioned inwardly of the inner end of the bottom retaining means and outwardly of the hub portion for restraining upward movement of the tube, no portion 'of the top retaining means being in vertical alignment with any portion of either the associated bottom retaining means or the hub portion whereby a tube may be secured against transverse movement within each recess and the rotor may be formed in one operation by molding.

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Centrifugal Separators (AREA)
US00209272A 1971-12-17 1971-12-17 Centrifuge rotor Expired - Lifetime US3825178A (en)

Priority Applications (7)

Application Number Priority Date Filing Date Title
US00209272A US3825178A (en) 1971-12-17 1971-12-17 Centrifuge rotor
DE2419865A DE2419865A1 (de) 1971-12-17 1974-04-24 Zentrifugenrotor
GB1953774A GB1423334A (en) 1971-12-17 1974-05-03 Centrifuge rotor
CA199,345A CA996525A (en) 1971-12-17 1974-05-07 Centrifuge rotor
CH650374A CH581502A5 (enrdf_load_stackoverflow) 1971-12-17 1974-05-13
BE144345A BE815067A (fr) 1971-12-17 1974-05-15 Rotor de centrifugeur
FR7416765A FR2270945B1 (enrdf_load_stackoverflow) 1971-12-17 1974-05-15

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US00209272A US3825178A (en) 1971-12-17 1971-12-17 Centrifuge rotor

Publications (1)

Publication Number Publication Date
US3825178A true US3825178A (en) 1974-07-23

Family

ID=22778096

Family Applications (1)

Application Number Title Priority Date Filing Date
US00209272A Expired - Lifetime US3825178A (en) 1971-12-17 1971-12-17 Centrifuge rotor

Country Status (7)

Country Link
US (1) US3825178A (enrdf_load_stackoverflow)
BE (1) BE815067A (enrdf_load_stackoverflow)
CA (1) CA996525A (enrdf_load_stackoverflow)
CH (1) CH581502A5 (enrdf_load_stackoverflow)
DE (1) DE2419865A1 (enrdf_load_stackoverflow)
FR (1) FR2270945B1 (enrdf_load_stackoverflow)
GB (1) GB1423334A (enrdf_load_stackoverflow)

Cited By (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
USD248044S (en) * 1976-03-15 1978-05-30 Honeywell Inc. Specimen slide preparation station console or similar article
USD248407S (en) 1976-03-15 1978-07-04 Honeywell Inc. Tube holder for medical specimen mixing device or similar article
US4162856A (en) * 1976-05-25 1979-07-31 Honeywell Inc. Agitation apparatus
US4305546A (en) * 1980-07-01 1981-12-15 Beckman Instruments, Inc. Large diameter air driven centrifuge rotor
US4801290A (en) * 1987-02-05 1989-01-31 Firma Andreas Hettich Angular cap for centrifuges
US4832679A (en) * 1987-06-20 1989-05-23 Firma Eppendorf-Netheler-Hinz Gmbh Rotor for centrifuge
US5188583A (en) * 1990-08-03 1993-02-23 Jean Guigan Apparatus for separating two phases of a sample of heterogeneous liquid by centrifuging, the apparatus being particularly suitable for separating plasma from whole blood
US5232432A (en) * 1990-11-30 1993-08-03 Eberle Guenter Angular head for centrifuges
WO1994015714A1 (en) * 1993-01-14 1994-07-21 Composite Rotors, Inc. Ultra-light composite centrifuge rotor
EP1077088A1 (de) * 1999-08-14 2001-02-21 Sigma Laborzentrifugen Gmbh Rotor für eine Laborzentrifuge
WO2008038311A1 (en) * 2006-09-27 2008-04-03 Health Robotics S.R.L. Mechanical stirrer
US11498083B2 (en) * 2018-08-16 2022-11-15 Eppendorf Ag Fixed angle centrifuge rotor with stiffening rib

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3100275A1 (de) * 1981-01-08 1982-08-05 Heraeus-Christ Gmbh, 3360 Osterode "zentrifugenrotor"

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3235173A (en) * 1960-07-28 1966-02-15 Unger Hans Peter Olof Agitating and/or fractioning centrifuge
SE327101B (enrdf_load_stackoverflow) * 1966-08-22 1970-08-10 H Unger

Cited By (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
USD248044S (en) * 1976-03-15 1978-05-30 Honeywell Inc. Specimen slide preparation station console or similar article
USD248407S (en) 1976-03-15 1978-07-04 Honeywell Inc. Tube holder for medical specimen mixing device or similar article
US4162856A (en) * 1976-05-25 1979-07-31 Honeywell Inc. Agitation apparatus
US4305546A (en) * 1980-07-01 1981-12-15 Beckman Instruments, Inc. Large diameter air driven centrifuge rotor
US4801290A (en) * 1987-02-05 1989-01-31 Firma Andreas Hettich Angular cap for centrifuges
US4832679A (en) * 1987-06-20 1989-05-23 Firma Eppendorf-Netheler-Hinz Gmbh Rotor for centrifuge
US5188583A (en) * 1990-08-03 1993-02-23 Jean Guigan Apparatus for separating two phases of a sample of heterogeneous liquid by centrifuging, the apparatus being particularly suitable for separating plasma from whole blood
US5232432A (en) * 1990-11-30 1993-08-03 Eberle Guenter Angular head for centrifuges
WO1994015714A1 (en) * 1993-01-14 1994-07-21 Composite Rotors, Inc. Ultra-light composite centrifuge rotor
US5382219A (en) * 1993-01-14 1995-01-17 Composite Rotor, Inc. Ultra-light composite centrifuge rotor
US5562582A (en) * 1993-01-14 1996-10-08 Composite Rotor, Inc. Ultra-light composite centrifuge rotor
EP1077088A1 (de) * 1999-08-14 2001-02-21 Sigma Laborzentrifugen Gmbh Rotor für eine Laborzentrifuge
WO2008038311A1 (en) * 2006-09-27 2008-04-03 Health Robotics S.R.L. Mechanical stirrer
US11498083B2 (en) * 2018-08-16 2022-11-15 Eppendorf Ag Fixed angle centrifuge rotor with stiffening rib

Also Published As

Publication number Publication date
CH581502A5 (enrdf_load_stackoverflow) 1976-11-15
GB1423334A (en) 1976-02-04
BE815067A (fr) 1974-09-02
FR2270945B1 (enrdf_load_stackoverflow) 1979-02-16
CA996525A (en) 1976-09-07
DE2419865C2 (enrdf_load_stackoverflow) 1987-12-10
DE2419865A1 (de) 1975-11-06
FR2270945A1 (enrdf_load_stackoverflow) 1975-12-12

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