US3779451A - Flexible shaft stabilizer - Google Patents

Flexible shaft stabilizer Download PDF

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Publication number
US3779451A
US3779451A US00201069A US3779451DA US3779451A US 3779451 A US3779451 A US 3779451A US 00201069 A US00201069 A US 00201069A US 3779451D A US3779451D A US 3779451DA US 3779451 A US3779451 A US 3779451A
Authority
US
United States
Prior art keywords
shaft
tubular member
motor
during rotation
centrifuge rotor
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
US00201069A
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English (en)
Inventor
I Lehman
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.)
Mitsubishi Electric Corp
Thermo IEC Inc
INT EQUIPMENT CO
BNP Paribas New York
Original Assignee
INT EQUIPMENT CO
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 INT EQUIPMENT CO filed Critical INT EQUIPMENT CO
Application granted granted Critical
Publication of US3779451A publication Critical patent/US3779451A/en
Assigned to BANQUE PARIBAS, THE EQUITABLE TOWER 787 SEVENTH AVENUE NEW YORK, NY 100019 reassignment BANQUE PARIBAS, THE EQUITABLE TOWER 787 SEVENTH AVENUE NEW YORK, NY 100019 ASSIGNMENT OF ASSIGNORS INTEREST. Assignors: INTERNATIONAL EQUIPMENT COMPANY
Assigned to INTERNATIONAL EQUIPMENT COMPANY, A CORP OF DE reassignment INTERNATIONAL EQUIPMENT COMPANY, A CORP OF DE ASSIGNMENT OF ASSIGNORS INTEREST. Assignors: DAMON CORPORATION, A CORP OF DE
Assigned to MITSUBISHI DENKI KABUSHIKI KAISHA reassignment MITSUBISHI DENKI KABUSHIKI KAISHA ASSIGNMENT OF ASSIGNORS INTEREST. Assignors: IWATA, TOSHIO, MATSUOKA, ATSUKO
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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    • 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
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B04—CENTRIFUGAL APPARATUS OR MACHINES FOR CARRYING-OUT PHYSICAL OR CHEMICAL PROCESSES
    • B04B—CENTRIFUGES
    • B04B9/00—Drives specially designed for centrifuges; Arrangement or disposition of transmission gearing; Suspending or balancing rotary bowls
    • B04B9/08—Arrangement or disposition of transmission gearing ; Couplings; Brakes
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B04—CENTRIFUGAL APPARATUS OR MACHINES FOR CARRYING-OUT PHYSICAL OR CHEMICAL PROCESSES
    • B04B—CENTRIFUGES
    • B04B9/00—Drives specially designed for centrifuges; Arrangement or disposition of transmission gearing; Suspending or balancing rotary bowls
    • B04B9/12—Suspending rotary bowls ; Bearings; Packings for bearings
    • 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
    • F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • F16C1/00—Flexible shafts; Mechanical means for transmitting movement in a flexible sheathing
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B04—CENTRIFUGAL APPARATUS OR MACHINES FOR CARRYING-OUT PHYSICAL OR CHEMICAL PROCESSES
    • B04B—CENTRIFUGES
    • B04B9/00—Drives specially designed for centrifuges; Arrangement or disposition of transmission gearing; Suspending or balancing rotary bowls
    • B04B9/08—Arrangement or disposition of transmission gearing ; Couplings; Brakes
    • B04B2009/085—Locking means between drive shaft and rotor

Definitions

  • dampening means to reduce the vibrations encountered at the critical speed.
  • dampening means reduces the severity of vibrations over a wider range of rotational speeds as compared to an undampened shaft the degree of vibration encountered still is undesirably high.
  • the use of dampening means has proven unsatisfactory for reducing the overall vibrational effect on the samples in the centrifuge rotor.
  • FIG. 2 is a cross sectional view taken along line 22 of FIG. 1.
  • DESCRIPTION OF PREFERRED EMBODIMENTS comprises a relatively thin elongated shaft 13 which is surrounded by a sleeve 14 made from a resilient material such' as natural or synthetic rubber.
  • the sleeve 14 is enclosed by a tubular member 15 made from a nonresilient structurally strong material preferably a metal.
  • the sleeve 14 and-shaft 13 are held together by the frictional force between the adjacent surfaces thereof which prevents relative motion between shaft 13 and sleeve 14 during rotation.
  • the tubular member I5 is attached to the lower end 16 of shaft 13 by screws-l7 and to the drive shaft 18 by screws 17 which clamps the tubular member 15 around end 16 and drive shaft 18.
  • the centrifuge rotor 10 is of conventional construction and comprises a metal body 20 and compartments 21 into which are placed samples which are to be separated. In use, the centrifuge rotor 10 is placed upon drive shaft coupling 24 and is retained thereon by con ventional means. Shaft 13 is attached to the shaft coupling 24 such as by press fitting the upper end 16a into a bore of the shaft coupling 24. Thus, during loading any deformation that is effected to the shaft 13 is limited by means of bearing surfaces 14a on sleeve 14 which sleeve 14 in turn is restricted by the rigid tubular member 15. With this construction, the chances of damaging shaft 13 are greatly decreased particularly during this loading operation.
  • the deformation on shaft 13 caused by unequal loading is in the order of about 5/1000 of an inch from the axial center I of shaft 13.
  • very little force is transmitconfined within a sleeve formed of a resilient material along a portion of its length and a cylindrical hollow tube which surrounds the shaft and do not move relative to the shaft.
  • the shaft is provided with coupling.
  • the present construction provides substantial advantages in view of the simplicity of construction, the minimization of the vibrational effect on the shaft 13 caused by the additional mass of the tubular member and the sleeve and the safety from permanent damage tothe shaft caused by deformation thereof particularly during loading the rotor 10.
  • the shaft 13 should beflexible and have a length to diameter ratio such that there is sufficient flexibility to permit self-balancing to occur without effecting yield stresses on the shaft.
  • the shaft length to diameter ratio is between about 15 to one and 30 to one.
  • the shaft should be sufficiently flexible to permit its deformation without being permanently deformed.
  • the sleeve 14 and tubular member 15 preferably have equal lengths and extend to enclose nearly all the length of the flexible shaft 13. The sleeve prevents restraint of the shaft by a force transferred directly'from the tubular member 15 and because the tubular member is relatively inelastic, it effectively prevents transmission of large forces to the shaft.
  • the sleeve 14 is not required in the present invention since the permanent deflection of the shaft 13 during rotation is not sufficient to effect contact thereof with the tubular member 15.
  • the interior of the tubular member at the top portion thereof can be provided with an elastic material such as rubber.
  • a flexible shaft construction for transmitting rotational energy between a centrifuge rotor and a motor which comprises a shaft having a regular horizontal cross section about its vertical axis, said shaft being sufficiently flexible when attached to a centrifuge rotor to permit self-balancing of the shaft to occur during rotation, said shaft having means on a first end for being coupled to a motor and having means on a second end for being coupled to a centrifuge rotor, a tubular member attached to the first end of said shaft so that the shaft and tubular member do not rotate relative to each other during rotation, a resilient sleeve between said tubular member and shaft to prevent contact of said shaft and tubular member during rotation, said tubular member having means at a first end for being coupled to a motor and to said first end of said shaft, said tubular member at a second end being unattached and surrounding said shaft, said second end of said tubular member positioned so that said shaft is located along the vertical axis of the tubular member and said tubular member and resilient sleeve
  • a centrifuge comprising a centrifuge rotor, a motor, a housing for said motor and a flexible shaft construction for transmitting rotational energy between the centrifuge rotor and the motor which comprises a shaft having a regular horizontal cross section about its vertical axis, said shaft being sufficiently flexible when attached to the cenrifuge rotor to permit self balancing of the shaft to occur during rotation, said shaft having means on a first end for being coupled to the motor and having means on a second end for being coupled to the centrifuge rotor, a tubular member attached to the first end of said shaft so that the shaft and tubular member do not rotate relative to each other during rotation, a resilient sleeve between said tubular member and shaft to prevent contact of said shaft and tubular member during rotation, said tubular member having means at a first end for being coupled to the motor and to said first end of said shaft, said tubular member at a second end being unattached and surrounding said shaft, said second end of said tubular member positioned so that said shaft is located along

Landscapes

  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Health & Medical Sciences (AREA)
  • Oral & Maxillofacial Surgery (AREA)
  • Mechanical Engineering (AREA)
  • Centrifugal Separators (AREA)
  • Flexible Shafts (AREA)
US00201069A 1971-11-22 1971-11-22 Flexible shaft stabilizer Expired - Lifetime US3779451A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US20106971A 1971-11-22 1971-11-22

Publications (1)

Publication Number Publication Date
US3779451A true US3779451A (en) 1973-12-18

Family

ID=22744359

Family Applications (1)

Application Number Title Priority Date Filing Date
US00201069A Expired - Lifetime US3779451A (en) 1971-11-22 1971-11-22 Flexible shaft stabilizer

Country Status (7)

Country Link
US (1) US3779451A (enrdf_load_stackoverflow)
JP (1) JPS4859456A (enrdf_load_stackoverflow)
CA (1) CA962467A (enrdf_load_stackoverflow)
DE (1) DE2251614A1 (enrdf_load_stackoverflow)
FR (1) FR2160920B1 (enrdf_load_stackoverflow)
GB (1) GB1397839A (enrdf_load_stackoverflow)
IT (1) IT975684B (enrdf_load_stackoverflow)

Cited By (18)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2814719A1 (de) * 1978-03-29 1979-10-11 Damon Corp Flexible schaftkonstruktion fuer eine hochtraegheitszentrifuge
US4457737A (en) * 1981-06-08 1984-07-03 Beckman Instruments, Inc. Small diameter shaft connection
US4572696A (en) * 1982-06-24 1986-02-25 Nippon Cable System Inc. Weighted cable cap
US4981585A (en) * 1985-11-14 1991-01-01 Norfolk Scientific, Inc. Centrifuge system and fluid container therefor
US5197939A (en) * 1988-06-21 1993-03-30 Alfa-Laval Separation A/S Decanter centrifuge
US5342282A (en) * 1992-08-04 1994-08-30 Jouan Centrifuge including a rotor driveshaft with an elastic damping seal and corresponding shaft
US5562823A (en) * 1994-04-25 1996-10-08 Reeves; William Combination centrifugal and sonic device for separating components within a solution
US5697848A (en) * 1995-05-12 1997-12-16 Capstone Turbine Corporation Compound shaft with flexible disk coupling
US5964663A (en) * 1997-09-19 1999-10-12 Capstone Turbine Corp. Double diaphragm compound shaft
US6056910A (en) * 1995-05-01 2000-05-02 Piramoon Technologies, Inc. Process for making a net shaped composite material fixed angle centrifuge rotor
WO2000078465A1 (en) * 1999-06-17 2000-12-28 Kendro Laboratory Products, L.P. Centrifuge gyro diaphragm capable of maintaining motor shaft concentricity
US6183408B1 (en) * 1999-05-03 2001-02-06 Beckman Coulter, Inc. Rotor shaft assembly having non-linear stiffness
US6428460B1 (en) * 1998-02-19 2002-08-06 Alfa Laval Ab Support device for a centrifugal separator providing axial and radial support
US20040138041A1 (en) * 2001-04-20 2004-07-15 Tatsuya Konno Centrifuge
US20110212822A1 (en) * 2008-09-03 2011-09-01 Thermo Electron Led Gmbh Centrifuge With A Coupling Element For Axially Locking A Rotor
US10247273B2 (en) 2015-08-28 2019-04-02 Sikorsky Aircraft Corporation Composite over wrap
CN113231208A (zh) * 2021-04-28 2021-08-10 厦门海荭兴仪器股份有限公司 一种扭力离心装置
US11731144B2 (en) * 2017-12-20 2023-08-22 Eppendorf Se Centrifuge rotor with locking levers providing visual indication of cover closure

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
IT1009321B (it) * 1973-03-20 1976-12-10 Int Equipment Co Dispositivo per trasmettere energia di rotazione da un motore ad un rotore di centrifuga

Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1979969A (en) * 1931-08-17 1934-11-06 Inland Mfg Co Propeller shaft with rubber cushion
US2265053A (en) * 1939-03-25 1941-12-02 Sanford M Anderson Electric driven cream separator
US2476894A (en) * 1945-10-08 1949-07-19 Westinghouse Electric Corp Flexible coupling
US2698526A (en) * 1948-04-14 1955-01-04 Beier Josef Shaffing for power transmission in motor-driven vehicles
US2725188A (en) * 1951-10-02 1955-11-29 Laval Separator Co De Shock mount for centrifugal separators
US2827229A (en) * 1953-08-26 1958-03-18 Sorvall Inc Ivan Centrifuge mounting means
US2878992A (en) * 1956-12-28 1959-03-24 Beckman Instruments Inc Centrifuge apparatus and rotor therefor
US2889695A (en) * 1958-02-28 1959-06-09 Kurt G F Moeller Flexible shaft coupling

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
BE372162A (enrdf_load_stackoverflow) * 1929-07-25

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1979969A (en) * 1931-08-17 1934-11-06 Inland Mfg Co Propeller shaft with rubber cushion
US2265053A (en) * 1939-03-25 1941-12-02 Sanford M Anderson Electric driven cream separator
US2476894A (en) * 1945-10-08 1949-07-19 Westinghouse Electric Corp Flexible coupling
US2698526A (en) * 1948-04-14 1955-01-04 Beier Josef Shaffing for power transmission in motor-driven vehicles
US2725188A (en) * 1951-10-02 1955-11-29 Laval Separator Co De Shock mount for centrifugal separators
US2827229A (en) * 1953-08-26 1958-03-18 Sorvall Inc Ivan Centrifuge mounting means
US2878992A (en) * 1956-12-28 1959-03-24 Beckman Instruments Inc Centrifuge apparatus and rotor therefor
US2889695A (en) * 1958-02-28 1959-06-09 Kurt G F Moeller Flexible shaft coupling

Cited By (27)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2420995A1 (fr) * 1978-03-29 1979-10-26 Damon Corp Arbre flexible pour centrifugeuse
US4201066A (en) * 1978-03-29 1980-05-06 Damon Corporation Flexible shaft construction for a high inertia centrifuge
DE2814719A1 (de) * 1978-03-29 1979-10-11 Damon Corp Flexible schaftkonstruktion fuer eine hochtraegheitszentrifuge
US4457737A (en) * 1981-06-08 1984-07-03 Beckman Instruments, Inc. Small diameter shaft connection
US4572696A (en) * 1982-06-24 1986-02-25 Nippon Cable System Inc. Weighted cable cap
US4981585A (en) * 1985-11-14 1991-01-01 Norfolk Scientific, Inc. Centrifuge system and fluid container therefor
US5197939A (en) * 1988-06-21 1993-03-30 Alfa-Laval Separation A/S Decanter centrifuge
US5342282A (en) * 1992-08-04 1994-08-30 Jouan Centrifuge including a rotor driveshaft with an elastic damping seal and corresponding shaft
US5562823A (en) * 1994-04-25 1996-10-08 Reeves; William Combination centrifugal and sonic device for separating components within a solution
US6056910A (en) * 1995-05-01 2000-05-02 Piramoon Technologies, Inc. Process for making a net shaped composite material fixed angle centrifuge rotor
US5697848A (en) * 1995-05-12 1997-12-16 Capstone Turbine Corporation Compound shaft with flexible disk coupling
US6094799A (en) * 1997-09-19 2000-08-01 Capstone Turbine Corporation Method of making double diaphragm compound shaft
US5964663A (en) * 1997-09-19 1999-10-12 Capstone Turbine Corp. Double diaphragm compound shaft
US6428460B1 (en) * 1998-02-19 2002-08-06 Alfa Laval Ab Support device for a centrifugal separator providing axial and radial support
US6183408B1 (en) * 1999-05-03 2001-02-06 Beckman Coulter, Inc. Rotor shaft assembly having non-linear stiffness
WO2000078465A1 (en) * 1999-06-17 2000-12-28 Kendro Laboratory Products, L.P. Centrifuge gyro diaphragm capable of maintaining motor shaft concentricity
US6354988B1 (en) * 1999-06-17 2002-03-12 Kendro Laboratory Products, Llp Centrifuge gyro diaphragm capable of maintaining motor shaft concentricity
US6638203B2 (en) * 1999-06-17 2003-10-28 Kendro Laboratory Products, Lp Centrifuge rotor shaft vertical displacement restriction device with angular deflection capability
US20040138041A1 (en) * 2001-04-20 2004-07-15 Tatsuya Konno Centrifuge
US7108651B2 (en) * 2001-04-20 2006-09-19 Hitachi Koko Co., Ltd. Centrifuge having multiple rotors
US20110212822A1 (en) * 2008-09-03 2011-09-01 Thermo Electron Led Gmbh Centrifuge With A Coupling Element For Axially Locking A Rotor
CN102176975A (zh) * 2008-09-03 2011-09-07 热电子Led有限公司 具有用于轴向锁定转子的耦合元件的离心机
US8678987B2 (en) * 2008-09-03 2014-03-25 Thermo Electron Led Gmbh Centrifuge with a coupling element for axially locking a rotor
CN102176975B (zh) * 2008-09-03 2014-11-12 热电子Led有限公司 具有用于轴向锁定转子的耦合元件的离心机
US10247273B2 (en) 2015-08-28 2019-04-02 Sikorsky Aircraft Corporation Composite over wrap
US11731144B2 (en) * 2017-12-20 2023-08-22 Eppendorf Se Centrifuge rotor with locking levers providing visual indication of cover closure
CN113231208A (zh) * 2021-04-28 2021-08-10 厦门海荭兴仪器股份有限公司 一种扭力离心装置

Also Published As

Publication number Publication date
DE2251614A1 (de) 1973-05-30
FR2160920B1 (enrdf_load_stackoverflow) 1976-10-29
GB1397839A (en) 1975-06-18
IT975684B (it) 1974-08-10
CA962467A (en) 1975-02-11
FR2160920A1 (enrdf_load_stackoverflow) 1973-07-06
JPS4859456A (enrdf_load_stackoverflow) 1973-08-21

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Legal Events

Date Code Title Description
AS Assignment

Owner name: BANQUE PARIBAS, THE EQUITABLE TOWER 787 SEVENTH AV

Free format text: ASSIGNMENT OF ASSIGNORS INTEREST.;ASSIGNOR:INTERNATIONAL EQUIPMENT COMPANY;REEL/FRAME:005305/0535

AS Assignment

Owner name: INTERNATIONAL EQUIPMENT COMPANY, A CORP OF DE, MAS

Free format text: ASSIGNMENT OF ASSIGNORS INTEREST.;ASSIGNOR:DAMON CORPORATION, A CORP OF DE;REEL/FRAME:005328/0295

Effective date: 19901005

AS Assignment

Owner name: MITSUBISHI DENKI KABUSHIKI KAISHA, JAPAN

Free format text: ASSIGNMENT OF ASSIGNORS INTEREST.;ASSIGNORS:MATSUOKA, ATSUKO;IWATA, TOSHIO;REEL/FRAME:005304/0046;SIGNING DATES FROM 19900313 TO 19900319