US3427896A - Variable counterweight system - Google Patents

Variable counterweight system Download PDF

Info

Publication number
US3427896A
US3427896A US3427896DA US3427896A US 3427896 A US3427896 A US 3427896A US 3427896D A US3427896D A US 3427896DA US 3427896 A US3427896 A US 3427896A
Authority
US
Grant status
Grant
Patent type
Prior art keywords
centrifuge
counterweight system
container
arm
weight
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
Inventor
Thomas L Hartman Jr
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.)
US Secretary of Army
Original Assignee
US Secretary of Army
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
Grant date

Links

Images

Classifications

    • BPERFORMING OPERATIONS; TRANSPORTING
    • B01PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01LCHEMICAL OR PHYSICAL LABORATORY APPARATUS FOR GENERAL USE
    • B01L99/00Subject matter not provided for in other groups of this subclass
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B04CENTRIFUGAL APPARATUS OR MACHINES FOR CARRYING-OUT PHYSICAL OR CHEMICAL PROCESSES
    • B04BCENTRIFUGES
    • B04B9/00Drives specially designed for centrifuges; Arrangement or disposition of transmission gearing; Suspending or balancing rotary bowls
    • B04B9/14Balancing rotary bowls ; Schrappers
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16FSPRINGS; SHOCK-ABSORBERS; MEANS FOR DAMPING VIBRATION
    • F16F15/00Suppression of vibrations in systems; Means or arrangements for avoiding or reducing out-of-balance forces, e.g. due to motion
    • F16F15/32Correcting- or balancing-weights or equivalent means for balancing rotating bodies, e.g. vehicle wheels
    • F16F15/36Correcting- or balancing-weights or equivalent means for balancing rotating bodies, e.g. vehicle wheels operating automatically, i.e. where, for a given amount of unbalance, there is movement of masses until balance is achieved
    • F16F15/366Correcting- or balancing-weights or equivalent means for balancing rotating bodies, e.g. vehicle wheels operating automatically, i.e. where, for a given amount of unbalance, there is movement of masses until balance is achieved using fluid or powder means, i.e. non-discrete material
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B04CENTRIFUGAL APPARATUS OR MACHINES FOR CARRYING-OUT PHYSICAL OR CHEMICAL PROCESSES
    • B04BCENTRIFUGES
    • B04B9/00Drives specially designed for centrifuges; Arrangement or disposition of transmission gearing; Suspending or balancing rotary bowls
    • B04B9/14Balancing rotary bowls ; Schrappers
    • B04B2009/143Balancing rotary bowls ; Schrappers by weight compensation with liquids
    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10TTECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T74/00Machine element or mechanism
    • Y10T74/21Elements
    • Y10T74/2109Balancing for drum, e.g., washing machine or arm-type structure, etc., centrifuge, etc.

Description

Feb. 18, 1969 L .IHARTMAN, JR 3, ,8 5

VARIABLE COUNTERWE I GHT S YSTEM Filed Aug. ,25, 1967 Thomas L. Hartman. Jr.

INVBNTOR.

United States Patent 4 Claims ABSTRACT OF THE DISCLOSURE A variable counterweight system located on an arm of a centrifuge. A fluid container is supplied with air to expel the fluid from the container through a U-tube, to vary the weight of the combination of the container and the U-tube.

Background of the invention This invention lies in the field of centrifuges. In particular this invention is for a centrifuge with a variable counterweight system. A prior art device for producing a variable weight on a centrifuge arm is a mechanical system wherein weights are slid along the centrifuge arm. This approach is mainly used on large centrifuges. This approach has a slow response time and involves elaborate control apparatus. A large centrifuge will take some unbalance, but the problem is more serious with a small centrifuge. There is no known method of taking care of unbalance on a small centrifuge while operating at high G levels.

Summary of the invention A fluid container is placed on an arm of the centrifuge. This container is filled with a liquid which will initially balance an expendable weight on the other arm of the centrifuge. As the centrifuge rotates, the weight required to balance the centrifuge changes. To vary the balancing weight, a controlled pressure is applied to the container to expel the fluid from the container through a U-tube.

An object of this invention is to provide a variable counterweight system whereby the weight on an arm of a centrifuge may be varied while the arm is in motion.

A further object of this invention is to provide a variable counterweight system whereby the weight on an arm of the centrifuge may be varied at a controlled rate.

Yet another object of this invention is to provide a variable counterweight system that is adaptable to small centrifuges as well as large centrifuges.

Brief description of the drawing FIGURE 1 is a schematic showing of the invention, and

FIGURE 2 is a side view of FIGURE 1 taken in the direction 2-2.

Description of the preferred embodiment Referring to FIGURE 1, a fluid container 2 is fitted with a pressure line having portions 4a and 4b. U-tube 8 is attached to orifice 6 and orifice 6 is attached to pressure line 4a. Pressure line 4b is connected via rotary joint 10 and solenoid valve 12 to pressure source 14. Fluid container 2 and U-tube 8 are located on the radial exice trem-ity of arm 16 of centrifuge 18. Fluid container 2 is proper size so that the weight of liquid therein is equal to the weight of the expendable material in test item 20. As the centrifuge is spun up to obtain the desired acceleration level, the force created by the liquid column of fluid container 2. is balanced by the liquid column 22 in the 'U-tube, because both columns are under the same acceleration force and are the same length. The surface level of the liquid is below the end portion 24 of the U-tube 8. Forces being equal, the liquid will remain in the container until an unbalancin-g force is applied. When solenoid valve 12 is opened, high pressure gas from pressure source 14 will provide the unbalancing force and the liquid will flow through orifice 6 and U-tube 8. The length of time to expel all the liquid is made to correspond with the time required to expend the material in test item 20 and is controlled by selection of orifice diameter and gas pressure.

It is to be understood that within the scope of the appended claims the invention may be practiced otherwise than as specifically described. Many modifications and variations of the present invention are possible in the light of the above teachings. For example, the weight of the system in the preferred embodiment is decreased. The reverse could be accomplished by simply adding fluid to the container instead of expelling liquid from the container. This would result in a positive weight control instead of a negative weight control. Accordingly, the scope of this invention is to be limited only by the appended claims.

I claim:

1. A centrifuge with a variable counterweight system comprising: a centrifuge having a first and a second arm; a fluid container having a first and a second end, said fluid container located on said first arm; :a fluid disposed in said fluid container and means for varying said fluid in said fluid container.

2. A centrifuge with a variable counterweight system as set forth in claim 1 wherein said first end of said fluid container is disposed adjacent the radial extremity of said first arm; and wherein said system further comprises a U-tube connected to said first end of said fluid container and extending above the other end of said fluid container.

3. A centrifuge with a variable counterweight system as set forth in claim 2- wherein said means for varying said fluid in said fluid container comprises: a rotary joint, a solenoid valve, and a pressure source; said rotary joint, solenoid valve, and pressure source being connected in series; said rotary joint being connected to said second end of said fluid container; and said rotary joint being connected for rotation between said solenoid valve and said centrifuge arms.

4. A centrifuge with a variable counterweight system as set forth in claim 3 further including an orifice located in said U-tube.

US3427896A 1967-08-23 1967-08-23 Variable counterweight system Expired - Lifetime US3427896A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
US66283167 true 1967-08-23 1967-08-23

Publications (1)

Publication Number Publication Date
US3427896A true US3427896A (en) 1969-02-18

Family

ID=24659394

Family Applications (1)

Application Number Title Priority Date Filing Date
US3427896A Expired - Lifetime US3427896A (en) 1967-08-23 1967-08-23 Variable counterweight system

Country Status (1)

Country Link
US (1) US3427896A (en)

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3534584A (en) * 1969-02-27 1970-10-20 Nasa Automatic balancing device
US3921898A (en) * 1974-05-29 1975-11-25 Kenneth Finkel Centrifuge
US20080087613A1 (en) * 2005-06-22 2008-04-17 Gambro Bct, Inc. Apparatus and Method for Separating Discrete Volumes of A Composite Liquid
US20110003675A1 (en) * 2009-07-06 2011-01-06 Caridianbct, Inc. Apparatus and Method for Automatically Loading Washing Solution In A Multi-Unit Blood Processor
US8840535B2 (en) 2010-05-27 2014-09-23 Terumo Bct, Inc. Multi-unit blood processor with temperature sensing
US8944983B2 (en) 2010-06-17 2015-02-03 Terumo Bct, Inc. Multi-unit blood processor with isolated valves for radio frequency sealing
US9733805B2 (en) 2012-06-26 2017-08-15 Terumo Bct, Inc. Generating procedures for entering data prior to separating a liquid into components

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2610523A (en) * 1950-12-16 1952-09-16 Leo M Kahn Automatic balancing system for rotatable article handling machines
US3117926A (en) * 1958-11-28 1964-01-14 Pellerin Corp Milnor Automatic imbalance control system for a clothes washing machine

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2610523A (en) * 1950-12-16 1952-09-16 Leo M Kahn Automatic balancing system for rotatable article handling machines
US3117926A (en) * 1958-11-28 1964-01-14 Pellerin Corp Milnor Automatic imbalance control system for a clothes washing machine

Cited By (16)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3534584A (en) * 1969-02-27 1970-10-20 Nasa Automatic balancing device
US3921898A (en) * 1974-05-29 1975-11-25 Kenneth Finkel Centrifuge
US8070665B2 (en) 2005-06-22 2011-12-06 CaridianBCT, Inc Method for separating discrete volumes of a composite liquid
US20080090714A1 (en) * 2005-06-22 2008-04-17 Gambro Bct, Inc. Apparatus and Method for Separating Discrete Volumes of A Composite Liquid
US20080096749A1 (en) * 2005-06-22 2008-04-24 Navigant Biotechnologies, Llc Apparatus and Method for Separating Discrete Volumes of A Composite Liquid
US7438679B2 (en) * 2005-06-22 2008-10-21 Caridianbct Biotechnologies, Llc Apparatus and method for separating volumes of a composite liquid with a balancing assembly
US20090317305A1 (en) * 2005-06-22 2009-12-24 Caridianbct, Inc. Bag Set for Separating Discrete Volumes of A Composite Liquid
US7674221B2 (en) * 2005-06-22 2010-03-09 Caridianbct, Inc. Apparatus for separating discrete volumes of a composite liquid with balancing elements
US20080087613A1 (en) * 2005-06-22 2008-04-17 Gambro Bct, Inc. Apparatus and Method for Separating Discrete Volumes of A Composite Liquid
US20100273627A1 (en) * 2005-06-22 2010-10-28 Caridianbct, Inc. Method for Separating Discrete Volumes of A Composite Liquid
US7766809B2 (en) * 2005-06-22 2010-08-03 Caridianbct, Inc. Apparatus for separating discrete volumes of a composite liquid
US20110003675A1 (en) * 2009-07-06 2011-01-06 Caridianbct, Inc. Apparatus and Method for Automatically Loading Washing Solution In A Multi-Unit Blood Processor
US8840535B2 (en) 2010-05-27 2014-09-23 Terumo Bct, Inc. Multi-unit blood processor with temperature sensing
US9687598B2 (en) 2010-05-27 2017-06-27 Terumo Bct, Inc. Multi-unit blood processor with temperature sensing
US8944983B2 (en) 2010-06-17 2015-02-03 Terumo Bct, Inc. Multi-unit blood processor with isolated valves for radio frequency sealing
US9733805B2 (en) 2012-06-26 2017-08-15 Terumo Bct, Inc. Generating procedures for entering data prior to separating a liquid into components

Similar Documents

Publication Publication Date Title
US3556682A (en) Apparatus for liquid displacement transfer
US3456875A (en) Air driven centrifuge
US3474670A (en) Pure fluid control apparatus
Rosenthal The shape and stability of a bubble at the axis of a rotating liquid
US3945532A (en) Metering device for flowable materials
US2225702A (en) Bubble-forming device
US3064942A (en) Emergency ram air power supply
US3951334A (en) Method and apparatus for automatically positioning centrifuge tubes
US2832895A (en) Control apparatus for wind motors
US3726146A (en) Gyroscopic device
US4291575A (en) Liquid level monitor
US3812724A (en) Rotational balancer
US2224241A (en) Rotary extractor
US4417884A (en) Centrifuge timer clamp
US3078728A (en) Fluid driven gyroscope
US3730134A (en) Pneumatic wafer spinner and control for same
US4805659A (en) Method of driving a centrifuge and device for carrying out the method
US7025714B2 (en) Process to balance a rotatable plate of a centrifuge and centrifuge using the process
US3322338A (en) Centrifuge stabilizing assembly with heat probe
US3692236A (en) Self-balancing centrifuge method and apparatus
US2625933A (en) Blood transfer mechanism
US2461643A (en) Dynamic balancer
US3667286A (en) Viscometer
US2396038A (en) Helicopter
US5921148A (en) Method for stabilizing a centrifuge rotor