US3185231A - Microbalance with low-friction bearing - Google Patents

Microbalance with low-friction bearing Download PDF

Info

Publication number
US3185231A
US3185231A US344270A US34427064A US3185231A US 3185231 A US3185231 A US 3185231A US 344270 A US344270 A US 344270A US 34427064 A US34427064 A US 34427064A US 3185231 A US3185231 A US 3185231A
Authority
US
United States
Prior art keywords
magnets
balance
knife edge
fulcrum
pair
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
US344270A
Other languages
English (en)
Inventor
Iwasaki Kanesuke
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.)
Sankyo Co Ltd
Original Assignee
Sankyo Co Ltd
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 Sankyo Co Ltd filed Critical Sankyo Co Ltd
Application granted granted Critical
Publication of US3185231A publication Critical patent/US3185231A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Images

Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01G—WEIGHING
    • G01G1/00—Weighing apparatus involving the use of a counterweight or other counterbalancing mass
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01G—WEIGHING
    • G01G21/00—Details of weighing apparatus
    • G01G21/02—Arrangements of bearings
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01G—WEIGHING
    • G01G23/00—Auxiliary devices for weighing apparatus
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01G—WEIGHING
    • G01G7/00—Weighing apparatus wherein the balancing is effected by magnetic, electromagnetic, or electrostatic action, or by means not provided for in the preceding groups
    • G01G7/02—Weighing apparatus wherein the balancing is effected by magnetic, electromagnetic, or electrostatic action, or by means not provided for in the preceding groups by electromagnetic action
    • Y—GENERAL 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
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10S177/00—Weighing scales
    • Y10S177/05—Magnets

Definitions

  • An object of the present invention is to obtain an increase in weighable maximum limit without sacrifice of the sensitiveness of a balance.
  • Another object of the present invention is to reduce the apparent total weight of a beam and other balance mechanism placed on a knife edge by utilizing a repellent force between each of two pairs of the magnets arranged opposite to each other whose opposing poles are of the like type.
  • Still another object is to provide a balance the sensitiveness of which is substantially constant over the whole range of weighable amounts.
  • a balance comprising a pair of cylindrical permanent magnets individually fixed at a right angle to the central axis passing through the fulcrum and on opposite sides of a beam, the radius of movement of said magnets being equal to the locus of movement of the center of gravity due to the slant of the beam which oscillates around the fulcrum of the beam of the balance or to a distance in such a range that the center of gravity is located below the fulcrum.
  • an other pair of magnets individually fixed at a suitable distance below, and in the opposing relation to the first pair of the magnets so that each of two pairs of the magnets arranged opposite to each other have like poles at their opposing end portions.
  • the balance of the present invention may further comprise an elastic member interposed between a bearing supporting a knife edge and a pedestal, said elastic member being placed movably in a downward direction, without horizontal deviation, in response to an increase in weight of the load.
  • increased weight imposed on the edge bear ing plate may cause the horizontally downward movement of the bearing and the pedestal, so that when the distance between each of two pairs of the opposing magnets is shortened, the repellent force is strengthened until it serves in compensating for or in minimizing an increase in the weight load on the knife edge.
  • FIG. 1 is a front elevation of said embodiment and FIG. 2 is a side elevation of an essential part of said embodiment.
  • FIG. 1 there is shown a balance using a round beam 1, which has as a central axis a vertical line passing thru the fulcrum, that is, a pointed end of a knife edge 2.
  • Cylindrical magnets 3, whose radius is as great as that drawn by the center of gravity of the beam 1 when the beam is slanted centering around the fulcrum, are fixed to either side of the beam 1.
  • magnets 6 which both are fixed to a yoke 5 fastened on a pedestal 4.
  • the respective magnets 6 are positioned opposite to the corresponding magnets 3 with suitable space intervening, so that the end portions of each pair of the opposing magnets 3, 6 are like poles.
  • An elastic member 10 is interposed between the lower surface of an edge bearing plate support 8, supporting an edge bearing plate 7, and a pedestal 9.
  • the present invention is constituted as above de scribed, when the balance is put in motion without load, the total weight of the beam, the magnets and other movable balance members is imposed upon the fulcrum, the pointed end of the knife edge 2.
  • the repellent force occurring between the like poles of each pair of the opposing magnets decreases said weight, and the effective point of the repellent force is located at the center of gravity. Therefore, shifting of the center of gravity does not take place, and the performance of a balance of the present invention is not adversely influenced.
  • the knife edge may be used up to the state near the limit hardness of its material and its durability may be improved.
  • the load is augmented up tothe limit of pressure resistance of the knife edge material.
  • the equilibrium is obtained by placing the load on one pan and weights on the other, so much weight further imposed upon a pointed end of the knife edge causes the compression of the elastic member, with the result that the distance between the opposing magnets is diminished and the repellent force due to magnetism is increased to compensate for or subtract from the added weight at the pointed end of the knife edge.
  • both the opposing magnets as used are permanent ones having almost equal magnetism
  • the repellent force is strengthened in inverse proportion to the second power of the distance between said magnets, so that the load at the edge point may be kept constant within the range of weight which the balance can measure.
  • the weight imposed upon the edge bearing plate of the balance of the invention may be kept approximately constant with or without a load being placed thereon, and this fact will result in a decrease in frictional resistance, an increase in effective weight and an enlargement of the range of weight of a load which may be measured.
  • a balance comprising a pair of cylindrical permanent magnets individually fixed at a right angle to the central axis of the beam passing through the fulcrum and on to either side of a beam, the radius of movement of said magnets being equal to the locus of movement of the center of gravity due to the slant of the beam centering around the fulcrum of the beam of the balance so that the center of gravity locatesbelow the fulcrum, and another pair of magnets individually fixed at a suitable distance below, and in the opposing relation to, the corresponding first magnets, so that each of two pairs of the magnets arranged each opposite to other have like poles at their opposing end portions.
  • a balance comprising a pedestal, an edge bear ing plate support thereon, a knife edge on said support, a beam fixed to said knife edge, weighing pans on opposite sides of said knife edge, the improvement which includes a first pair of magnets on opposite sides of said knife edge and fixed to said beam, a second pair of magnets spaced vertically from said first pair and mounted on said pedestal, the poles at the free ends of said first pair of magnets being of the same polarity, respectively, as the adjacent poles of the magnets of the second pair.
  • a balance according to claim 3 characterized in that the magnets of the first pair are horizontal and cylindrical.
  • a balance according to claim 3 characterized in that said beam is resiliently mounted on said pedestal through said plate support.
  • a balance according to claim 3 characterized in that the magnets of said second pair are vertically mounted on said pedestal.
  • a balance according to claim 3 characterized in that said second pair of magnets are below said first pair.
  • a balance according to claim 3 characterized in that the adjacent poles of said magnets are south on one side and are north poles on the other side of said knife edge.

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)
  • Testing Of Balance (AREA)
  • Electric Ovens (AREA)
US344270A 1963-02-15 1964-02-12 Microbalance with low-friction bearing Expired - Lifetime US3185231A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP615363 1963-02-15

Publications (1)

Publication Number Publication Date
US3185231A true US3185231A (en) 1965-05-25

Family

ID=11630569

Family Applications (1)

Application Number Title Priority Date Filing Date
US344270A Expired - Lifetime US3185231A (en) 1963-02-15 1964-02-12 Microbalance with low-friction bearing

Country Status (3)

Country Link
US (1) US3185231A (de)
CH (1) CH435782A (de)
DE (1) DE1449943A1 (de)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3502163A (en) * 1969-03-03 1970-03-24 Xerox Corp Equal arm balance with c-shaped fulcrum sleeve formed on beam

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US238841A (en) * 1881-03-15 Solomon h
US1717462A (en) * 1923-11-20 1929-06-18 Zh Rikagaku Kenkyujo Electromagnetic chemical balance
US1974940A (en) * 1931-03-16 1934-09-25 Ibm Scale
FR58734E (fr) * 1948-09-18 1954-03-22 Const D App S Scient Et Ind So Balance automatique
DE922673C (de) * 1953-04-22 1955-01-20 Bizerba Waagenfabrik Wilhelm K Druckglied zum UEbertragen von Druckkraeften zwischen schneidengelagerten Wiegehebeln

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US238841A (en) * 1881-03-15 Solomon h
US1717462A (en) * 1923-11-20 1929-06-18 Zh Rikagaku Kenkyujo Electromagnetic chemical balance
US1974940A (en) * 1931-03-16 1934-09-25 Ibm Scale
FR58734E (fr) * 1948-09-18 1954-03-22 Const D App S Scient Et Ind So Balance automatique
DE922673C (de) * 1953-04-22 1955-01-20 Bizerba Waagenfabrik Wilhelm K Druckglied zum UEbertragen von Druckkraeften zwischen schneidengelagerten Wiegehebeln

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3502163A (en) * 1969-03-03 1970-03-24 Xerox Corp Equal arm balance with c-shaped fulcrum sleeve formed on beam

Also Published As

Publication number Publication date
CH435782A (de) 1967-05-15
DE1449943A1 (de) 1969-01-23

Similar Documents

Publication Publication Date Title
US2305783A (en) Means for determining the weight of bodies
US3185231A (en) Microbalance with low-friction bearing
US2279076A (en) Weighing scale
US1943850A (en) Magnetometer
US3191702A (en) Weighing device of spring-balance type
US3194060A (en) Seismic displacement transducer
GB1107179A (en) Precision balance
US2189775A (en) Dynamically compensated strain gauge
US2590184A (en) Magnetometer
US2914361A (en) Balances
US3185232A (en) Spring balance
US3019655A (en) Device for measuring gravity on moving platforms
US4467650A (en) Hard static balancing machine
US3838927A (en) Metering device using a pendulum for determining gravitational reference direction
US2584949A (en) Flexure plate weighing scale
US4091885A (en) Weight sensing apparatus
US2626796A (en) Precision balance
US3910366A (en) Weighing
US3269472A (en) Vibration isolation mechanism for electrical weighing scale
SU425111A1 (ru) Датчик скорости и направления ветра
US2692772A (en) Weighing scale
JPH0243126B2 (de)
US2899827A (en) frank
SU872941A1 (ru) Устройство дл определени упругих характеристик пружин
US2613926A (en) Precision weighing balance