Flexure Hinges For Gyros Patents (Class 74/5F)
  • Patent number: 5881598
    Abstract: A flat pack gyroscope fabricated of a number of discrete flat layers, which, when assembled together, accomplish a version of a single degree of freedom, spinning wheel gyroscope.
    Type: Grant
    Filed: June 27, 1997
    Date of Patent: March 16, 1999
    Assignee: Milli Sensor Systems and Actuators, Inc.
    Inventors: Michele Sapuppo, Donato Cardarelli, Charles R. Dauwalter
  • Patent number: 5820078
    Abstract: A control moment gyro having a housing enclosing a spinning momentum wheel. A rocking plate circumscribes the housing and is compliantly connected thereto by a set of isolator struts and non-contacting actuators which isolate the rocking plate from the inherent vibrations and oscillations of the momentum wheel. The rocking plate is pivotably connected to a gimbal ring about a first pivot axis normal to the spin axis of the momentum wheel. The gimbal ring is pivotably connected to the structure of the spacecraft about a second axis orthogonal to the spin axis and the first pivot axis. Actuators are provided to control the attitude of the housing relative to the rocking plate, the rocking plate relative to the gimbal ring, and the gimbal ring relative to the spacecraft.
    Type: Grant
    Filed: September 27, 1996
    Date of Patent: October 13, 1998
    Assignee: Hughes Electronics Corporation
    Inventor: John P. Harrell
  • Patent number: 5816097
    Abstract: A position control apparatus for a gyroscope mechanically controls a setting position of the gyroscope. The position control apparatus for a gyroscope includes a circular mount for adjusting a setting position of the gyroscope in a predetermined direction, a plurality of tightening screws for fixing the gyroscope to the circular mount by way of several through holes, a plurality of locking screws for fixing the circular mount by way of several open holes formed in a supporting mechanism, a plurality of adjusting screws for adjusting the set position of the gyroscope in a up or down direction, and an adjusting flute prepared at an end of the circular mount, for adjusting the set position of the gyroscope in an axial direction.
    Type: Grant
    Filed: December 27, 1996
    Date of Patent: October 6, 1998
    Assignee: Samsung Electronics Co., Ltd.
    Inventor: Jong-Chul Park
  • Patent number: 5377543
    Abstract: A low profile angular sensor assembly having a base member adapted for rotation about a spin axis and a generally planar gyroscopic element resiliently coupled to the base member for rotation therewith and for pivotal movement relative to the base member about a pivot axis orthogonal to the spin axis also includes a planar piezoelectric beam which is coupled to the base member and to the gyroscopic element so that it is substantially parallel to the gyroscopic element. The coupling is selectively compliant to isolate the piezoelectric beam from motion in the plane of the beam.
    Type: Grant
    Filed: November 10, 1992
    Date of Patent: January 3, 1995
    Assignee: GEC-Marconi Electronic Systems Corp.
    Inventors: Charles R. Fuchs, Peter Lindsay, Henry S. Nicholas
  • Patent number: 5213436
    Abstract: The invention is directed to a spring joint having two holding bodies. The spring joint is fixedly attached to a base at one of the holding bodies. The second holding body is provided for the attachment of a component which is intended to undergo a pivot movement relative to the base during operation. A spring element acts as a connecting body between the two holding bodies. A stop is mounted on the spring joint so that the spring joint can be used again after impact loads or intermittent vibration. This stop includes at least one stop body which limits the movement range of the spring body in the spring joint for radial and axial load to the elastic range.
    Type: Grant
    Filed: August 2, 1991
    Date of Patent: May 25, 1993
    Assignee: Anschutz & Co. GmbH
    Inventors: Karl-Heinz Fichtner, Kurt Brenner
  • Patent number: 5156056
    Abstract: A gyroscope which comprises a gyroscopic element mounted to a base which is mounted coaxially to a spin motor. Preferably at least one hinge is between the gyroscopic element and the base. There is at least one piezoelectric crystal, preferably a bender element, having a base end, an outer end. A bender element provides an electrical signal as a function of bending. The base end of the crystal can be connected to the base and the crystal extends from the base with the crystal having a major plane transverse to the spin axis. The outer end of the crystal is connected to the gyroscopic element via a crystal restraint having a degree of freedom of movement parallel to the spin axis. Preferably, the crystal restraint is a wire connected on one end to the crystal and on the opposite end to the gyroscopic element. The restraint wire is preferably parallel to the spin axis.
    Type: Grant
    Filed: June 24, 1991
    Date of Patent: October 20, 1992
    Assignee: Condor Pacific Industries, Inc.
    Inventors: Roland Pittman, Michael A. Napolitano
  • Patent number: 5144743
    Abstract: The outer ball bearing races (16, 26) of two ball bearings (12, 14) are supported on each other through a cardan joint (42). Axial bias forces in opposite directions are exerted on the inner ball bearing races (18, 28) by screws (44, 50) through cardan joints (48, 54). When the ball bearings rotate the outer ball bearing races (16, 26) are aligned. By means of a curing bonding agent the outer ball bearing races (16, 26) are fixed in a bearing sleeve (10) and the inner ball bearing races (18, 28) are fixed to a shaft (36) when the ball bearings rotate.
    Type: Grant
    Filed: December 20, 1990
    Date of Patent: September 8, 1992
    Assignee: Bodenseewerk Geratetechnik GmbH
    Inventor: Hagen Kempas
  • Patent number: 5142485
    Abstract: A new two-axis accelerometer comprising a rotating body linked to the motor rotor via a flexure zone. In a first type the rotating mass is concentrated and the flexure zone permits the rotating mass to perform a transversal parallel shift. In a second type the rotating body is an inertia rotor and the flexure zone is an extension of the rotor shaft that embodies a flexible portion. In either type the rotating body/flexure zone combination has two degrees of flexing freedom with two different flexure coefficients in two mutually perpendicular directions both normal to the electric motor shaft. The accelerometer further comprises a deflector shaft coaxial with the rotor shaft and extending beyond the rotating body and associated with electro-optical measuring means and processor means for measuring linear acceleration components in said two mutually perpendicular directions.
    Type: Grant
    Filed: July 16, 1990
    Date of Patent: August 25, 1992
    Assignee: The State of Israel, Ministry of Defence, Rafael Armament Development Authority
    Inventors: Jehuda Rosenberg, Patrick Bar-Avi
  • Patent number: 4930365
    Abstract: A gymballess, two axis rate gyroscope in which an inertia rotor is keyed on the electric motor shaft. The motor shaft comprises a flexible part (flexure shaft) adapted to flex upon precession of the inertia rotor in consequence of an angular velocity input around either of two axes normal to each other and both normal to the rotor spin axis, and an end portion extending beyond the inertia rotor in a direction away from the electric motor (delfector). The gyroscope further comprises a non-contacting measuring device in association with the deflector for detecting any deflection thereof.
    Type: Grant
    Filed: September 16, 1988
    Date of Patent: June 5, 1990
    Inventors: Itzhak Porat, Jehuda Rosenberg, Ehud Netzer, Yishai Netzer
  • Patent number: 4891997
    Abstract: A dynamically tuned gyro is disclosed in which a gyro rotor is mounted on an rotor shaft of a spin motor through the medium of a hinge unit. The rotor shaft is in the form of a hollow hysteresis ring mounted rotatably by the intermediary of a pair of bearings, while the gyro rotor supported by the hinge unit is disposed within the hollow inside space of the hysteresis ring.
    Type: Grant
    Filed: July 27, 1988
    Date of Patent: January 9, 1990
    Assignee: Tamagawa Seiki Kabushiki Kaisha
    Inventor: Sokichi Hayashi
  • Patent number: 4848169
    Abstract: A two-degree of freedom, open loop, spring restrained rate gyro apparatus includes a motor mounted in a housing with a conductive device provided for conducting operating voltages into and out of the housing. A shaft is rotatably mounted in the housing and is connected to be driven by the motor. A ring, having a hub, is connected to the shaft. The ring and hub are interconnected by a torsion bar. A stop is connected to the shaft adjacent the ring so as to define an air gap between the ring and the stop. A pair of variable reluctance pickoffs are mounted in the housing adjacent the ring. The pickoffs also define an air gap between each of the pickoffs and the ring. An optical pickoff is also mounted adjacent the ring. A signal processor is connected to the pair of variable reluctance pickoffs and to the optical pickoff for measuring the rate of the gyro.
    Type: Grant
    Filed: May 22, 1987
    Date of Patent: July 18, 1989
    Assignee: Honeywell, Inc.
    Inventors: Damon H. Duncan, Randy P. Goettsche
  • Patent number: 4825713
    Abstract: A two axis, monolithic suspension assembly for a gyroscope using cross flexure pivots and having an integral driving element which is rotatable about an axis of rotation, wherein the driving element is connected to a driven element by a suspension means, which comprises an upper gimbal, an intermediate gimbal and a lower gimbal. The lower gimbal is fixedly connected to the driving element and the upper gimbal is fixedly connected to the driven element. Each of the upper gimbal and lower gimbal have two cross flexure pivots, which connect to the intermediate gimbal. The cross flexure pivot consists of two diagonal flexure strips which represent an increase in the radial stiffness and a reduction in the radial compliance, from those required in prior art devices.
    Type: Grant
    Filed: September 30, 1987
    Date of Patent: May 2, 1989
    Assignee: Honeywell, Inc.
    Inventor: William P. Wilkey
  • Patent number: 4812072
    Abstract: A structural pivot 10 includes a first end cap 18 and a second end cap 20 which are connected together by an elastic member 22 in the form of a cruciform. The structural pivot 10 does not exhibit a geometric center shift when one of the end caps is angularly deflected.
    Type: Grant
    Filed: March 11, 1988
    Date of Patent: March 14, 1989
    Assignee: Santa Barbara Research Center
    Inventor: John J. Brooks
  • Patent number: 4811613
    Abstract: A two-axis angular rate gyroscopic apparatus is provided having a rotatable dish. The dish has a central hub portion and a plurality of flexible members, each of which extends from the hub portion. The entire disk is electrically conductive and connected to a reference potential. A plurality of electrically conductive members which are mounted end-to-end are located on an insulated plate mounted adjacent to the disk. A motor is provided for rotating the disk at approximately 2000 rpm. In addition, each of the flexible members in the disk has a pie-shaped section removed therefrom in order to increase its flexibility. By increasing the flexibility of the movable members, performance at low motor speeds is facilitated. An electronic circuit provides an output corresponding to the differential capacitance between the rotating disk and the members on the plate mounted adjacent thereto.
    Type: Grant
    Filed: September 4, 1987
    Date of Patent: March 14, 1989
    Assignee: Etak, Inc.
    Inventors: Alan C. Phillips, Terence J. O'Brien, Charles S. Taylor
  • Patent number: 4802784
    Abstract: A structural pivot 10 includes a first sleeve 18 and a second sleeve 20 which are connected together by a pair of flexures 22 and 24. Each flexure includes a pair of blades 40, 42 and 54, 56. The free ends of the blades are connected to the sleeves 18, 20 while the common cross members 44 and 62 remain spaced from the inner surfaces of the sleeves. During angular rotation of the sleeves, the blades can flex without resulting in a geometric center shift for the pivot.
    Type: Grant
    Filed: March 11, 1988
    Date of Patent: February 7, 1989
    Assignee: Santa Barbara Research Center
    Inventor: John J. Brooks
  • Patent number: 4757961
    Abstract: A rate gyro instrument primarily for use in a gun fired spinning projectile eliminates all associated bearings by affixing the rotor to the spinning projectile body to obviate spin rotor bearings and by employing a flexible joint or constriction as a gimbal substitute to eliminate gimbal bearings.
    Type: Grant
    Filed: April 11, 1986
    Date of Patent: July 19, 1988
    Assignee: Aerojet-General Corporation
    Inventor: Inge Maudal
  • Patent number: 4694703
    Abstract: A two-axis, monolithic, flexure hinge suspension system for an accelerometer or gyroscope has first, second and third cylindrical portions which are slightly axially spaced from each other along a common axis and are connected by pairs of flexible hinges therebetween. Each pair of flexible hinges is mutually perpendicular to another pair of flexible hinges and is also perpendicular to the common axis. Each flexural hinge comprises a pair of flexure leaves extending between adjacent cylindrical portions and joined together at the crossing portions thereof. One of the leaves in the flexure extends downwardly from an arcuate wall of one of the cylindrical portions to an arcuate wall of another cylindrical portion at about a 55.degree. angle to a vertically oriented common axis. The other leaf in the flexure extends upwardly from an arcuate wall portion in the one cylindrical portion to an arcuate wall in the other cylindrical portion at about a 55.degree. angle to the vertically oriented common axis.
    Type: Grant
    Filed: June 28, 1984
    Date of Patent: September 22, 1987
    Assignee: Lear Siegler, Inc.
    Inventor: Gregory S. Routson
  • Patent number: 4665605
    Abstract: A ring element on the driving side and a ring element on the rotor side and a gimbal arrangement with two gimbals are formed by two coaxial, cylindrical rings, wherein peripheral cuts, having deflected ends are provided in the rings. The peripheral cuts separate the portions of the ring elements from the gimbals. The ends form leaf springs which form flexural pivots. One leaf spring is connected to the ring element on the driving side and the other leaf spring is connected to the ring element on the driven side. The cuts are produced by electroerosion. Each of the cuts is symmetrical with respect one of two planes extending at right angles to each other.
    Type: Grant
    Filed: March 19, 1986
    Date of Patent: May 19, 1987
    Assignee: Bodenseewerk Geratetechnic GmbH
    Inventor: Hagen Kempas
  • Patent number: 4658659
    Abstract: A gyroscope with a rotor which rotates about a nonrotating axis is simple its structure and has but a few movable parts because the rotor axis (2) is divided into two sections by an articulation piece (8), whereby one section (2a) is connected with the housing (11) and the other section (2b) is tiltable about the articulation piece and carries the bearing axis (13) for the rotor (5). The articulation piece (8) is arranged approximately in the center of gravity of the rotor (5). The gyroscope (10) may be constructed to have one or two degrees of freedom and it may be equipped with the measuring device necessary for its operation as a displacement gyroscope or as a rate gyroscope. For a measuring operation in which the rotor (5) is driven only for the uptake, a compensating circuit is provided with an amplifier (23), a servo-control (24), and a multiplier (25) for producing a measured signal proporational to the measured quantity independently of the r.p.m. of the rotor (5).
    Type: Grant
    Filed: December 17, 1984
    Date of Patent: April 21, 1987
    Assignee: Messerschmitt-Boelkow-Blohm Gesellschaft mit beschraenkter Haftung
    Inventor: Ernst Gruber
  • Patent number: 4655096
    Abstract: A flexure mount assembly particularly adapted for use in a dynamically tuned two-degree-of-freedom gyroscope to provide a universal coupling between a rotor element and a drive shaft. The mount features a substantially planar "spider" member normally oriented transversely to the spin axis of the rotor. The spider has four webs, each web extending radially from an inner central area associated with an inner gimbal ring to an outer annular area. The outer annular area is associated with an outer ring which is divided into four independent sectors.Each web has two sections and each section has the shape of two parabolas which intersect at their vertices. A central aperture roughly elliptical in shape is thus formed in each web. At both ends of each aperture, narrow radial slots are formed. Two mutually perpendicular "vertical" or cross flexure members each have key portions that extend in planes parallel to the spin axis through the radial slots.
    Type: Grant
    Filed: August 31, 1984
    Date of Patent: April 7, 1987
    Assignee: Northrop Corporation
    Inventors: Robert O. Westhaver, Donald W. Carow, Frank R. Archibald
  • Patent number: 4655629
    Abstract: A flexural pivot device and method for producing same, wherein rotational motion of a first tubular member relative to a second tubular member is obtained by: forming flexural members from a shape memory alloy into a first shape in the austenitic phase at a first temperature; cooling the flexural members into the martensitic phase at a second temperature; forming the flexural members into a second shape; installing the flexural members between the first and second tubular members; and recreating the first temperature, thus returning the flexural members to the first shape in the austenitic phase and rotating the second tubular member relative to the first tubular member.
    Type: Grant
    Filed: February 19, 1985
    Date of Patent: April 7, 1987
    Assignee: Westinghouse Electric Corp.
    Inventor: Robert Flaherty
  • Patent number: 4633722
    Abstract: A single-axis servoed rate gyroscope has a sealed gimbal assembly that is mounted by bearings for angular displacement about a rotational axis, at right angles to the gyroscope spin axis. The gyroscope torquer comprises a circular, cylindrical coil mounted at the bottom of the gimbal assembly, coaxially of the spin axis and below the rotational axis. The coil extends in an annular gap formed between a cylindrical permanent magnet, mounted on the gyroscope base structure, and a part of the base structure which surrounds the magnet and which provides a magnetic return path. The magnet is polarized at right angles to the spin axis and the rotational axis, so that energization of the coil causes a restoring torque on the gimbal assembly about the rotational axis. The bearings are located in V-shape slots formed in the base structure surrounding the gimbal assembly.
    Type: Grant
    Filed: February 21, 1984
    Date of Patent: January 6, 1987
    Inventors: Geoffrey Beardmore, Nicholas R. Capaldi
  • Patent number: 4621529
    Abstract: A navigation sensor, including a gyroscopic element, which has a spin axis, and which has flexure hinge for resiliently mounting the element on a base, and a torque sensing assembly, which has a first piezoelectric beam that is mounted in coaxial relation to the spin axis, and which has a first beam restraining member that mounts a first edge portion of the first piezoelectric beam, and which has a second beam restraining member that mounts an opposite edge portion of the first piezoelectric beam. The first piezoelectric beam is adapted to generate an electrical signal proportional to the angular velocity of the navigation sensor about an axis perpendicular to the spin axis.
    Type: Grant
    Filed: June 17, 1985
    Date of Patent: November 11, 1986
    Assignee: The Singer Company
    Inventor: Roland Pittman
  • Patent number: 4596158
    Abstract: A tuned gyroscope incorporates a dynamic absorber for lessening the transmissibility of resonant vibrations. A damping mass is symmetrical about a rotating element of the gyroscope. A symmetrical arrangement of elastomeric material is utilized to mount the mass to such rotating element. The mass and elastomeric material are so chosen with respect to geometry and material composition that out-of-phase vibrations are induced within the damping apparatus upon the onset of resonant vibrations to minimize the transmissibility of such vibrations with respect to the elements of the tuned gyroscope.
    Type: Grant
    Filed: January 5, 1983
    Date of Patent: June 24, 1986
    Assignee: Litton Systems, Inc.
    Inventor: Michael Strugach
  • Patent number: 4592242
    Abstract: A gimbal (108) on the driving side and a gimbal (106) on the rotor side and a gimbal arrangement with two gimbals (22,76) are formed by two coaxial, cylindrical rings (10,64) wherein peripheral cuts (12,14,16,18 and 66,68,70,72, respectively), having ends forming angles are provided in the rings. The peripheral cuts separate the portions of the gimbals (108,106) from the gimbals (22,76). The ends form leaf springs (for example 60 and 100), which form flexural pivots. One leaf spring (60) is connected to the gimbal (108) on the driving side and the other leaf spring is connected to the gimbal (106) on the driven side. The cuts are produced by electroerosion.
    Type: Grant
    Filed: April 12, 1983
    Date of Patent: June 3, 1986
    Assignee: Bodenseewerk Geratetechnik GmbH
    Inventor: Hagen Kempas
  • Patent number: 4587860
    Abstract: A flexibly suspended gyroscope apparatus comprises a fixed body (100), a rotary drive shaft (200) supported in said body, and a flywheel (220) mounted on said drive shaft by a rotary joint (222). The joint serves to retain the flywheel radially and to transmit rotary drive thereto, while leaving said flywheel free to oscillate with two degrees of freedom about a central position in which the axis of the flywheel is aligned with the axis of the drive shaft. The flywheel is also free for axial translation with one degree of freedom. Axial support means (101, 102, 103, 104) are provided for applying an axial force to the flywheel by electrostatic or electromagnetic induction, and axial position detector means are provided for detecting the axial position of the flywheel, said support means being servo controlled by said detector means to maintain the flywheel in a predetermined axial position.
    Type: Grant
    Filed: March 27, 1984
    Date of Patent: May 13, 1986
    Assignee: Societe de Fabrication d'Instruments de Mesure
    Inventor: Jean-Thierry Audren
  • Patent number: 4577519
    Abstract: A gyroscope load cell which includes a gyroscope suspended in a housing and provided with the usual inner and outer gimbals. The specific improvement of the present invention is concerned with the joint between the inner and outer gimbals which, in the present case, consists of a V-strap hinge composed of a pair of straps intersecting along a line which intersects the precessional axis of the gyroscope at an angle of 90.degree..
    Type: Grant
    Filed: June 17, 1983
    Date of Patent: March 25, 1986
    Assignee: Pfister GmbH
    Inventor: Hans W. Hafner
  • Patent number: 4528864
    Abstract: A monolithic two axis gimbal suspension system for a tuned inertial instrument includes flexure hinges which are formed monolithically integral therein to define the pivot axis of the suspension system, each monolithically integral flexure hinge having aligned pairs of skew, crossed bridges integral with the relatively rotatable gimbals of the suspension system. The suspension system is used in a dry tuned gyroscope to suspend the gyro rotor from the gyro spin shaft. A method for making the monolithic suspension system comprises electro discharge machining of a monolithic workpiece mounted on a movable mandrel. Monolithically integral flexure hinges comprising skew, crossed bridges formed therein, interconnect gimbal portions which are formed in the workpiece. Construction of an improved tuned gyroscope employing the monolithic suspension system in a single compartment housing is described.
    Type: Grant
    Filed: April 14, 1983
    Date of Patent: July 16, 1985
    Assignee: Incosym, Inc.
    Inventor: Robert J. G. Craig
  • Patent number: 4499778
    Abstract: A flexure mount particularly adapted for use in a dynamically tuned gyroscope provides a universal coupling between a rotor element and a drive shaft. The mount features a substantially planar "spider" member oriented transversely to the spin axis of the rotor. The spider has four webs that each extend radially from an inner gimbal ring to a segmented outer ring having four independent sectors each associated with and centered on one of the webs. Two mutually perpendicular "vertical" or cross flexure members each have key portions that extend through radial slots in the webs of the spider. The inner gimbal ring and the spider have central apertures coaxial with the spin axis. An alignment member is seated in the aligned apertures. The vertical flexure members are seated in a set of mutually perpendicular and axially extending slots formed in the alignment member. The spider and the cross members are preferably etched or stamped from precision rolled sheet material.
    Type: Grant
    Filed: February 3, 1981
    Date of Patent: February 19, 1985
    Assignee: Northrop Corporation
    Inventors: Robert O. Westhaver, Gary Walker, Menno G. Koning
  • Patent number: 4498340
    Abstract: A damping mechanism for a two-degree-of-freedom rate gyroscope of the flexible disk type includes a pair of auxiliary disks, one mounted closely adjacent each side of the rotor disk to provide squeeze film type damping of any axial vibrations of the rotor at the resonant frequencies of the flexible rotor.
    Type: Grant
    Filed: April 7, 1983
    Date of Patent: February 12, 1985
    Assignee: Sperry Corporation
    Inventor: Damon H. Duncan
  • Patent number: 4487083
    Abstract: The invention is an integrated pick-off, torquer, and reference signal generator system for a two-degree-of-freedom flexure-suspended free-rotor gyroscope and a miniature gyroscope incorporating such an integrated system. The three gyroscopic functions are combined within apparatus including a single coil assembly using a radially permanent magnetized ring located on the gyroscope rotor wheel, with a plurality of pick-off coils mounted compactly with respect to the instrument case and each partially inserted in an air gap provided at the gyroscope rotor wheel periphery. The spacial flux magnitude variation around the rotor wheel in the air gap generates an alternating current in each pick-off coil as the rotor spins. The difference in the voltages induced in diametrically opposed pick-off coils provides an output pick-off signal, while the sum of the signals induced in all coils provides an alternating phase reference voltage.
    Type: Grant
    Filed: November 15, 1986
    Date of Patent: December 11, 1984
    Assignee: Sperry Corporation
    Inventor: Thomas R. Quermann
  • Patent number: 4464942
    Abstract: A universal joint hinge assembly for a tuned rotor gyroscope is insensitive to restraint changes due to spin axes accelerations. The hinge assembly is readily trimmable at the gyroscope wheel assembly to permit adjusting of the axial compliance of the gyroscope wheel thereby reducing the rectified torques due to linear acceleration.
    Type: Grant
    Filed: July 20, 1981
    Date of Patent: August 14, 1984
    Assignee: The Singer Company
    Inventor: Walter J. Krupick
  • Patent number: 4445375
    Abstract: A tuned coriolis, angular rate measuring device includes a substantially hollow, generally annular rotor driven by a high-speed, synchronous spin motor. The rotor is made unsymmetrical by mounting within the rotor near its periphey at least a pair of high density masses, the respective masses being located diametrically opposite one another. The rotor is secured within a gimbal structure which is, in turn, mounted in tuned fashion upon a support housing through a cantilever spring at each end along the gimbal output axis, thereby providing bearingless, frictionless pivots permitting limited gimbal rotation. A pair of piezo-electric crystals is secured at opposite edges of one of the springs for sensing relative angular motion between the gimbal and the housing. The crystals are electrically paralleled so as to cancel any signals resulting from linear movement between the gimbal and housing.
    Type: Grant
    Filed: February 27, 1981
    Date of Patent: May 1, 1984
    Assignee: General Electric Company
    Inventor: Robert C. Wells
  • Patent number: 4444442
    Abstract: A bearing apparatus is disclosed which has a first attaching member secured to a fixed portion, a flexible member, a second attaching member secured to a rotary portion, the flexible member being attached to the first and second attaching members, and a flexible portion formed on the flexible member. In this case, the neutral plane of the flexible portion includes the rotary axis of the rotary portion and the center in the lengthwise direction of the flexible portion coincides with the rotary axis of the rotary portion.
    Type: Grant
    Filed: March 25, 1982
    Date of Patent: April 24, 1984
    Assignee: K. K. Tokyo Keiki
    Inventors: Takeshi Hojo, Michio Fukano
  • Patent number: 4438655
    Abstract: The invention is a suspension system for a two-degree-of freedom flexure-suspended free-rotor gyroscope and a miniature gyroscope incorporating such a flexure system. An axial strut suspension device for controlling the axial position of the rotor includes a series of thin, flat sections, while the radial suspension function is performed by a cross-shaped element of very thin metal, one pair of the diametrically opposed cross ends thereof being affixed to the rotor-driving shaft, while the other pair of opposed cross ends thereof is affixed to the gyroscope rotor.
    Type: Grant
    Filed: November 15, 1976
    Date of Patent: March 27, 1984
    Assignee: Sperry Corporation
    Inventor: Thomas R. Quermann
  • Patent number: 4397185
    Abstract: An inertial instruments uses a suspension structure that is exterior to and surrounds a cup shaped inertial mass which carries torquing magnets within the cup. Torquer coils are also located within the cup. In a preferred embodiment, axially magnetized disc magnets within the cup cooperate with toroidal torquer coils. In other embodiments segmented or bar magnets are used. The instrument can be used either as a gyroscope by coupling the suspension to a rotor, or as an accelerometer.
    Type: Grant
    Filed: May 12, 1981
    Date of Patent: August 9, 1983
    Assignee: Incosym, Inc.
    Inventors: Robert J. G. Craig, James J. Imbault, John E. Fitzgerald
  • Patent number: 4395922
    Abstract: A gimballed platform stabilization system includes at least one outer member, an inner member, and an intermediate inertia bearing member. The intermediate member has limited coaxial angular freedom about an isolation axis with respect to the inner and outer members. A limited freedom (about the isolation axis) torsional flexure element is coupled between the intermediate and inner members. A first servo loop establishes a "negative spring rate" in parallel with the positive spring rate associated with the flexure element, maintaining a low net effective spring force on the inner member. A second servo loop prevents the angular excursion between the intermediate member and the inner member to extend beyond the limits of the flexure element. This inertia reaction stabilization configuration reduces disturbing torques from a stabilization axis to non-linear spring residuals which are relatively small.
    Type: Grant
    Filed: February 4, 1981
    Date of Patent: August 2, 1983
    Assignee: The Charles Stark Draper Laboratory, Inc.
    Inventors: Philip N. Bowditch, James E. Negro
  • Patent number: 4386535
    Abstract: A gyro includes a rotatable hub with a flexing member centrally supporting a rotor. The rotor is further supported by a pair of piezoelectric force transducers angularly separated by 90 degrees. The rotor turns with the hub. Oscillators drive the transducers and, as the gyro undergoes angular displacement, the oscillators "follow" the instant natural frequency of the transducers. FM signals are generated which may be resolved into two digital signals indicative of angular rate about the gyro case X and Y axes.
    Type: Grant
    Filed: September 12, 1980
    Date of Patent: June 7, 1983
    Assignee: The Singer Company
    Inventor: William C. Albert
  • Patent number: 4380108
    Abstract: A monolithic two axis gimbal suspension system for a tuned inertial instrument includes flexure hinges which are formed monolithically integral therein to define the pivot axis of the suspension system, each monolithically integral flexure hinge having aligned pairs of skew, crossed bridges integral with the relatively rotatable gimbals of the suspension system. The suspension system is used in a dry tuned gyroscope to suspend the gyro rotor from the gyro spin shaft. A method for making the monolithic suspension system comprises electro discharge machining of a monolithic workpiece mounted on a movable mandrel. Monolithically integral flexure hinges comprising skew, crossed bridges formed therein, interconnect gimbal portions which are formed in the workpiece. Construction of an improved tuned gyroscope employing the monolithic suspension system in a single compartment housing is described.
    Type: Grant
    Filed: May 19, 1980
    Date of Patent: April 19, 1983
    Assignee: Incosym, Inc.
    Inventor: Robert J. G. Craig
  • Patent number: 4357837
    Abstract: Gyroscope apparatus includes a tubular rotor that is supported at opposite ends by bearings, such as a gas-lubricated bearing, for rotation about its axis. A gimbal ring encircles the rotor and is resiliently supported with the rotor, for angular displacement about an axis at right angles to the rotor axis, by a pair of flexure pivots located intermediate the ends of the rotor. An inertia ring is mounted concentrically with the gimbal ring by another pair of flexure pivots for angular displacement about an axis at right angles to the rotor axis and the axis of displacement of the gimbal ring. The major part of each flexure pivot is contained within the radial thickness of the gimbal ring. Displacement of the inertia ring is sensed by pick-offs the outputs of which are used to control the restoring torque applied by torquers located outwardly of the pick-offs.
    Type: Grant
    Filed: October 27, 1980
    Date of Patent: November 9, 1982
    Assignee: Smiths Industries Public Limited Company
    Inventor: Geoffrey Beardmore
  • Patent number: 4336967
    Abstract: A bearing apparatus is disclosed which has a first attaching member secured to a fixed portion, a flexible member, a second attaching member secured to a rotary portion, the flexible member being attached to the first and second attaching members, and a flexible portion formed on the flexible member. In this case, the neutral plane of the flexible portion includes the rotary axis of the rotary portion and the center in the lengthwise direction of the flexible portion coincides with the rotary axis of the rotary portion.
    Type: Grant
    Filed: January 14, 1980
    Date of Patent: June 29, 1982
    Assignee: K.K. Tokyo Keiki
    Inventors: Takeshi Hojo, Michio Fukano
  • Patent number: 4332365
    Abstract: A flexure mounted gimbal support assembly for limited angular rotation hag a flexure assembly of an open web construction mounted between a platform and a gimbal assembly via a ball bearing assembly. The flexure assembly has a plurality of flexure elements having a high flexibility so that the flexure assembly provides less resistance to rotational motion than the static ball-bearing friction over the limited angular rotation. A slip-ring assembly is mounted inboard of the flexure assembly to provide direct connection to angle measuring resolvers and direct-drive dc torque motors, which eliminates slip-ring brush-on-ring effects and torque motor brush friction effects.
    Type: Grant
    Filed: October 12, 1979
    Date of Patent: June 1, 1982
    Assignee: The United States of America as represented by the Secretary of the Navy
    Inventor: Edmund C. Berk
  • Patent number: 4326428
    Abstract: A rate gyroscope having a spinning mass coupled to a rotor through a pair of orthogonally disposed flexible, diametrically extending suspension arms. The spinning mass is adapted to pivot about the arms in response to a pair of orthogonal angular rates being measured by the gyroscope. The angular orientation of the mass with respect to the gyroscope housing provides an indication of the angular rates. An optical sensor system disposed within the gyroscope and supporting electronics are used to produce an electrical signal representative of the angular orientation of the mass and, hence, such signal provides a measurement of the pair of angular rates being measured by the gyroscope.
    Type: Grant
    Filed: October 3, 1979
    Date of Patent: April 27, 1982
    Assignee: Raytheon Company
    Inventors: Lewis S. Bostwick, Albert V. Filosa, Richard R. LaTorre
  • Patent number: 4297883
    Abstract: Rate of turn indicator for a nautical vessel, aircraft, and the like indicating the rate of turn or swing in units such as degrees per unit of time from a particular course of travel. The indicator includes a magnetic gyro wheel including a flexible hub rotating about an axis in the same plane as the course of travel and electromagnetic sensing coils receiving the deviations of strength of the electromagnetic field of the magnetic gyro wheel from an axis on turning from the course of travel. The magnetic gyro wheel includes a plurality of permanent magnets of alternating poles positioned about a circumferential axis of a circular member, and a flexible hub material affixed to the interior diameter of the circular member. The hub is affixed to an axially supported shaft. The magnetic gyro wheel forms a rotor of a direct current motor and is axially rotated by at least one drive coil.
    Type: Grant
    Filed: December 13, 1979
    Date of Patent: November 3, 1981
    Inventor: E. Paul Shannon
  • Patent number: 4297904
    Abstract: A gimbal assembly for carrying a gyroscope rotor for spin about a z axis is described which has an inner boss (3), and outer ring (6), first and second gimbal frames (4 and 5) situated between the two, first outer pivots (8) pivoting the first frame (4) to the outer ring (6) about a y axis, second outer pivots (10) pivoting the second frame (5) to the outer ring (6) about an x axis, first inner pivots (11) pivoting the second frame (5) to the boss (3), and second inner pivots (9) pivoting the first frame to the boss (3) about the x axis, the gimbal frames (4 and 5) being interlaced one with another.A preferred method of forming the inner boss (3), the outer ring (6), and the gimbal frames (4 and 5) from a billet of solid material is also described.
    Type: Grant
    Filed: January 31, 1980
    Date of Patent: November 3, 1981
    Assignee: British Aerospace Public Limited Company
    Inventor: Donald F. Morton
  • Patent number: 4286370
    Abstract: A monolithic two axis gimbal suspension system for a tuned inertial instrument includes flexure hinges which are formed monolithically integral therein to define the pivot axis of the suspension system, each monolithically integral flexure hinge having aligned pairs of skew, crossed bridges integral with the relatively rotatable gimbals of the suspension system. The suspension system is used in a dry tuned gyroscope to suspend the gyro rotor from the gyro spin shaft. A method for making the monolithic suspension system comprises electro discharge machining of a monolithic workpiece mounted on a movable mandrel. Monolithically integral flexure hinges comprising skew, crossed bridges formed therein, interconnect gimbal portions which are formed in the workpiece. Construction of an improved tuned gyroscope employing the monolithic suspension system in a single compartment housing is described.
    Type: Grant
    Filed: May 19, 1980
    Date of Patent: September 1, 1981
    Assignee: Incosym, Inc.
    Inventor: Robert J. G. Craig
  • Patent number: 4285248
    Abstract: A two-degree-of-freedom gyroscope wherein a rotor is attached to and axially restrained by a taut wire fixed within the rotor drive shaft. Lateral or radial restraint for the rotor is provided by magnetic repulsion.
    Type: Grant
    Filed: October 17, 1979
    Date of Patent: August 25, 1981
    Assignee: Rockwell International Corporation
    Inventors: Raymond Noar, Louis J. Blache
  • Patent number: 4270392
    Abstract: A low cost, simple to manufacture, two axis gyro having an outer flexure assembly and an inner flexure assembly. Each flexure assembly contains two flexure hinges which represent a reduction in the number of hinges and milled cuts from those required in prior art devices. The inner flexure assembly is designed to nest within the outer flexure assembly and both are mounted centrally on a rotatable shaft for rotation about the gyro spin axis. The two flexures of the outer assemblies are separated 180.degree. from each other and adjacent to two slots also separated by 180.degree. in the rim of the outer gimbal. Likewise, the two flexures of the inner flexure assembly are separated 180.degree. from each other and 90.degree. from each of the outer flexures. The outer flexure assembly axis is offset axially by a controlled amount from the inner flexure assembly axis to achieve nominal balance on both flexure axes.
    Type: Grant
    Filed: September 13, 1978
    Date of Patent: June 2, 1981
    Assignee: The Singer Company
    Inventor: Walter J. Krupick
  • Patent number: 4270393
    Abstract: A vibration-isolating apparatus having orthogonal X, Y, and Z axes is provided for mounting a payload to a base. The payload contains a torque producing device. Torque generated about the X-axis in the payload is communicated to the base through a stiff linkage in the rotational degree of freedom about the X-axis. The apparatus includes first and second support frames, the payload mounted on the first support frame and the second support frame mounted to the base. Gimbal means permit rotation of the payload about the Y and Z axes. Linear dampening means dampen forces between the payload and base communicated linearly along the X, Y and Z axes and rotation dampening means dampen forces between the payload and base communicated rotationally about the Y and Z axes.
    Type: Grant
    Filed: March 12, 1979
    Date of Patent: June 2, 1981
    Assignee: Martin Marietta Corporation
    Inventors: Norman A. Osborne, Robert L. Gates
  • Patent number: 4269072
    Abstract: A flexure assembly for a dynamically-tuned, free rotor, two axis gyroscopic sensor wherein coplanar, concentric, cylindrical inner and outer gimbals are coupled between corresponding cylindrical axially spaced, inner and outer cylindrical members, to which are secured respectively the gyroscopic rotor and the rotor spin shaft, by means of flexures which provide substantially rigid axial and radial support of the rotor relative to the drive shaft and relative angular freedom of tilt of the rotor about orthogonal axes perpendicular to the drive shaft axis, wherein the flexures comprise separate thin strips fabricated from high-strength, spring-quality sheet metal which bridge gaps formed between the gimbal members and the rotor and rotor shaft members and are secured at their ends as by brazing, welding, cementing, etc. in receiving slits machined in these members.
    Type: Grant
    Filed: February 14, 1979
    Date of Patent: May 26, 1981
    Assignee: Sperry Corporation
    Inventor: Damon H. Duncan