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    1.
    发明专利
    失效

    公开(公告)号：JPH0557527B2

    公开(公告)日：1993-08-24

    申请号：JP50192082

    申请日：1982-05-11

    Applicant: SETRA SYSTEMS INC

    Inventor： RII SHII IN ,  BURIIFUA TENISU KEI

    IPC: G01G3/00 ,  G01G7/06 ,  G01G21/24 ,  G01G23/06 ,  G01G23/08

    Abstract: A weighing system includes a weighing pan connected to a rigid armature by a linkage in a manner constraining the armature to motion along a reference axis with respect to the housing. Another linkage couples the armature to a housing. A low friction damper is coupled between the weighing pan and the housing to damp the relative motion of the force input member and the housing. A force transducer, comprising a pair of complimentary opposed surfaces having a mutual separation which is related to the force across the transducer, is coupled between the armature and the housing. Coupled to the transducer is a position sensor which generates a signal representative of the separation between the complimentary opposed surfaces of the transducer.

    2.
    发明专利
    失效

    公开(公告)号：JPH0230450B2

    公开(公告)日：1990-07-06

    申请号：JP8335382

    申请日：1982-05-19

    Applicant: SETRA SYSTEMS INC

    Inventor： SHII IN RII

    IPC: G01G3/00 ,  G01L1/14

    Abstract: A force transducer includes a pair of rigid force summing members that each extend toward one another along a central axis and a pair of beam members that each extend along the central axis and couple the force summing members to form a parallelogram frame. More specifically, the beam members are mounted to the force summing members to provide a frame such that a force applied to one force summing member along a first reference axis and resisted on the opposite side of the other force summing member produces a flexing of the beam members. The force summing members each include sensing members that also extend along the central axis toward one another. The sensing members are spaced from one another in the direction of the first reference axis. Electrically conductive members mounted on the opposite faces of the sensor form a variable gap capacitor that is integral with the frame. The flexing of the frame produces a change in the gap that relates to the applied force. The force summing and beam members are formed of a dielectric material. In one form each beam member is integral with an associated force summing member, the beam member being defined by an open slot. In one form of the construction the beam member portions associated with each force summing member are joined at a point of inflection (i.e. the zero bending moment point) of the beam as joined. In the preferred form, the beam members and the associated force summing members are integral, monolithic and each force summing member and associated beam and sensor portions is identical to the other.

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