Patents Examined by Raymond Barrera
  • Patent number: 5990773
    Abstract: In a thermal switch device having a reed switch, a temperature-sensitive magnetic cylinder (1) and cylindrical permanent magnets (2a, 2b) disposed around the reed switch (3), and an insulator case (7), the case is provided with an inner cylinder (5) formed in an inner space of the case. The reed switch is supported in the inner cylinder, and the temperature-sensitive magnetic cylinder and the cylindrical permanent magnets are fitted on the inner cylinder. A heat conductor member (6) is attached to the case to be partially exposed outside the case while partially be in contact with the temperature-sensitive magnetic cylinder and the cylindrical permanent magnets.
    Type: Grant
    Filed: October 1, 1998
    Date of Patent: November 23, 1999
    Assignee: Tokin Corporation
    Inventor: Takeshi Sengoku
  • Patent number: 5988124
    Abstract: An apparatus for reciprocating an engine valve between open and closed positions in an internal-combustion engine includes an electromagnetic actuator having first and second mutually spaced electromagnets for generating electromagnetic forces; and an armature disposed between the first and second electromagnets and movable in response to the electromagnetic forces. The armature is operatively coupled to the engine valve to cause it to reciprocate between its open and closed positions. First and second gas springs are coupled to the armature for opposing the electromagnetic forces generated by the first and second electromagnets, respectively. A pressurized gas source supplies the first and second gas springs with pressure and a control arrangement varies the pressure in the first and second gas springs. A positioning spring is coupled to the engine valve for moving the engine valve into its closed position when the first and second gas springs are in a depressurized state.
    Type: Grant
    Filed: March 15, 1999
    Date of Patent: November 23, 1999
    Assignee: FEV Motorentechnik GmbH & Co. Kommanditgesellschaft
    Inventor: Markus Duesmann
  • Patent number: 5986528
    Abstract: An electrical switching device prevents moving contacts from welding to stationary contacts in a switching device. This is achieved using an auxiliary magnet system in the main current path, which system produces a contact pressure force corresponding to the excitation current so that no arcs are produce between the contacts when overcurrents and short-circuit currents occur. The moving iron core of the auxiliary magnet system is for this purpose connected to the contact link mounting via which the contacts are switched on and off.
    Type: Grant
    Filed: July 21, 1998
    Date of Patent: November 16, 1999
    Assignee: Siemens Aktiengesellschaft
    Inventors: Markus Meier, Bardo Koppmann
  • Patent number: 5986531
    Abstract: Electromagnetic shielding device for nuclear magnetic resonance apparati, having a cavity (5) with at least one or more openings for introducing the body (K) or the part thereof under examination, which cavity (5) is defined by at least one magnet (1) for generating a static field, one or more coils for generating a magnetic field gradient (2), one or more coils (3) for generating spin-exciting radio-frequency pulses, and one or more coils (4) for receiving echo signals. The transmitting (3) and receiving coils (4) are contained in an electromagnetic shielding structure (7, 7', 7"), at the openings of the detection cavity (5), whereat the shielding structure may be closed by removable shielding elements (9, 10, 18, 20), electrically connectable thereto.
    Type: Grant
    Filed: August 11, 1997
    Date of Patent: November 16, 1999
    Assignee: Esaote S.p.A.
    Inventor: Alessandro Carrozzi
  • Patent number: 5982260
    Abstract: An open electromagnet for use in MRI apparatus includes a pair of field coils which respectively comprise juxtaposed poles between which an imaging volume of substantially homogeneous magnetic field is defined. A support structure, which serves rigidly to support the field coils in spaced apart relationship, includes two steel plates between which the field coils are positioned. The relative position of the field coils and the plates is selected such that forces of magnetic attraction between the field coils are at least partly counter-balanced by forces of attraction between the plates and the field coils. In this manner, the force on the field coils and their associated support structure due to the forces of attraction between the poles is significantly reduced or nullified.
    Type: Grant
    Filed: January 16, 1997
    Date of Patent: November 9, 1999
    Assignee: Oxford Magnet Technology Limited
    Inventor: Alex Francis Byrne
  • Patent number: 5982258
    Abstract: The trip bar is sub-divided into a first actuating part associated to the trip rod of the actuator and a second actuating part operating in conjunction with the indicating device. A mechanical coupling link is arranged between the two actuating parts being adjustable between a coupled position and a disengaged position. An operating lever performs locking of the second actuating part in the active position to keep the fault information on the indicating device, whereas the first actuating part returns automatically to the inactive position when said mechanical link is in the disengaged position.
    Type: Grant
    Filed: January 20, 1999
    Date of Patent: November 9, 1999
    Assignee: Schneider Electric SA
    Inventors: Pierre Baginski, Gilles Budillon, Jean-Pierre Nereau
  • Patent number: 5982257
    Abstract: An electromagnetic relay is provided having a base; a motor assembly mounted on the base, the motor assembly including a coil, a core and a frame; an armature pivotably mounted on the frame; a first electrical contact mounted to the base; a movable elongated member biased against the armature at least at two points such that movement of the armature is restricted and the armature is disposed toward an initial position spaced from the core; and a second electrical contact mounted to the movable elongated member and operatively associated with the first electrical contact.
    Type: Grant
    Filed: October 31, 1996
    Date of Patent: November 9, 1999
    Assignee: Siemens Electromechanical Components, Inc.
    Inventor: Richard Allen Vernier
  • Patent number: 5973582
    Abstract: In the installation of a superconducting magnet for magnetic resonance imaging at a preselected position in a mobile van, preselected curvilinear magnetic segments are applied to preselected locations on the exterior of the magnet to counteract magnet inhomogeneities in the imaging bore which would otherwise occur because of magnetic material in the van structure.
    Type: Grant
    Filed: November 18, 1998
    Date of Patent: October 26, 1999
    Assignee: General Electric Company
    Inventors: Timothy John Havens, Chung-Yih Ho, Xianrui Huang, Steven Ho-Chong Wong, Bu-Xin Xu, Minfeng Xu
  • Patent number: 5973581
    Abstract: The invention relates to a starter motor switch in which there are arranged a stationary magnetic core and a winding at the center of which a plunger moves to act on a rod, a portion of which carries a contact intended to establish contact between two terminals, of the type in which the stationary core delimits a chamber and a chamber and of the type in which the stationary core has a cavity in which a portion of the rod is accommodated, wherein it comprises a sealing partition comprising a transverse plate resting against the front face of the stationary core, which is extended by a rim which interacts in a sealed manner with the cover, and comprising a central part, the shape of which complements that of the central cavity with which it interacts in a sealed manner.
    Type: Grant
    Filed: September 8, 1998
    Date of Patent: October 26, 1999
    Assignee: Valeo Equipements Electriques Moteur
    Inventors: Pascal Jacquin, Claude Thevenon
  • Patent number: 5969586
    Abstract: In an electromagnetic relay in which a contact mechanism 50 provided on a base 10 is driven by a card 60 which slides and moves in parallel to the axis of an electromagnet block 20 provided in the base 10 as the electromagnet block 20 is magnetized and demagnetized, the base 10 comprises a guide portion 17 for restricting the card 60 in its position. This prevents variations in the performance characteristics so that high productivity and long service life of contacts can be obtained.
    Type: Grant
    Filed: March 17, 1998
    Date of Patent: October 19, 1999
    Assignee: OMRON Corporation
    Inventors: Masayuki Noda, Takeshi Suzuki, Takashi Noguchi, Tatsuo Shinoura, Takashi Asao
  • Patent number: 5969589
    Abstract: A solenoid includes a ferrofluid in gaps between the moving and stationary elements which ferrofluid reduces noise caused by activating a plunger positioned within the solenoid. A permanent magnet can be included as a solenoid element to increase magnetic field strength within the solenoid to retain the ferrofluid within the solenoid.
    Type: Grant
    Filed: August 28, 1996
    Date of Patent: October 19, 1999
    Assignee: Ferrofluidics Corporation
    Inventor: Kuldip Raj
  • Patent number: 5966062
    Abstract: An improved magnetopermanent plate, constituted by a metallic body with high magnetic permeability, in the active plane of which there are provided hollow seats for accommodating corresponding coils composed of turns of electrically conducting wire covered with a sheath made of a material based on fluorocarbon resins; the turns are further mutually bound by means of a vitreous medium and are enclosed in a likewise vitreous protective element; the coils can be accommodated in the hollow seats, between which magnetopermanent means with a low polarization temperature coefficient are accommodated; means are provided for retaining the coils in the corresponding hollow seats.
    Type: Grant
    Filed: April 9, 1999
    Date of Patent: October 12, 1999
    Assignee: Rivi Giovanni & C.S.N.C
    Inventors: Giovanni Rivi, Davide Rivi, Roberta Rivi
  • Patent number: 5963117
    Abstract: Proposed is an improvement in an opposed-magnet magnetic circuit assembly with permanent magnets suitable for use, for example, in an MRI instrument comprising a pair of upper and lower permanent magnets to form a magnetic-field gap space therebetween, a pair of magnetic-field adjustment plates each on the surface of the permanent magnet to face the gap space and a pair of back yokes each on the back surface of the permanent magnet. According to the first aspect of the invention, a combination of a gradient coil and a shimming plate is mounted on the magnetic-field adjustment plate with intervention of several pieces of shim members and, further, another set of second shim members are bonded to the surface of the shimming plate facing the gap space with an object to improve the uniformity of the magnetic field in the gap space.
    Type: Grant
    Filed: December 7, 1998
    Date of Patent: October 5, 1999
    Assignees: Shin-Etsu Chemical Co., Ltd., GE Yokogawa Medical Systems, Ltd.
    Inventors: Ken Ohashi, Yuhito Yoneda, Koji Miyata, Yuji Inoue
  • Patent number: 5963116
    Abstract: A reed relay includes a reed switch with contacts, and a pair of terminals connected to the contacts. A tubular electrostatic shield defines an axially extending central bore within which the reed relay is inserted. A coil assembly has a winding drum, and a coil provided on the winding drum. The winding drum defines an axially extending central bore within which the electrostatic shield is inserted with the reed switch. A first pair of leads extend oppositely to each other, and are connected to the electrostatic shield at the opposite ends of the coil assembly. A second pair of leads extend oppositely to each other, and are connected to the electrostatic shield at the opposite ends of the coil assembly. A third pair of leads extend oppositely to each other, and are connected to the coil at the opposite ends of the coil assembly. A fourth pair of leads extend oppositely to each other, and are connected to the terminal of the reed switch at the opposite ends of the coil assembly.
    Type: Grant
    Filed: January 5, 1999
    Date of Patent: October 5, 1999
    Assignee: Fujitsu Takamisawa Component Limited
    Inventors: Tomohisa Endoh, Yukishige Noguchi, Yukihiro Takano, Hideto Harayama
  • Patent number: 5959519
    Abstract: A switch device including an inner yoke and an outer yoke are arranged around the winding of an electromagnetic block, and a plate-shaped permanent magnet is inserted between the two yokes. A highly efficient actuation of the switching device is achieved by the assistance of the permanent magnet.
    Type: Grant
    Filed: August 28, 1998
    Date of Patent: September 28, 1999
    Assignee: Siemens AG
    Inventors: Ralph-Ronald Gobel, Norbert Sorgel, Hans Pfab
  • Patent number: 5959520
    Abstract: An improved magnetic decoupler with a magnetic field shape, strength and gradient optimized for releasing security tags, such as an antitheft device of the type described above. Due to the structure of the magnetic decoupler, it contains less ferrous material than prior art decouplers heretofore employed. Reduction in size of the magnetic decoupler, along with improved magnetic strength, derive from the magnet assembly including magnets arranged with orientations in quadrature to increase axial magnetic field gradient within the decoupler cavity by superposition of the magnetic fields of each magnet.
    Type: Grant
    Filed: August 21, 1998
    Date of Patent: September 28, 1999
    Assignee: Dexter Magnetic Technologies, Inc.
    Inventors: Richard E. Stelter, David Choit, Thomas J. Devaney
  • Patent number: 5955934
    Abstract: A solenoid includes a ferrofluid in gaps between the moving and stationary elements which ferrofluid reduces noise caused by activating a plunger positioned within the solenoid. A permanent magnet can be included as a solenoid element to increase magnetic field strength within the solenoid to retain the ferrofluid within the solenoid. A cushion located between the plunger and a butt toward which it moves also reduces the noise, while the ferrofluid maintains a relatively high solenoid force relative to a solenoid with air gaps.
    Type: Grant
    Filed: March 26, 1998
    Date of Patent: September 21, 1999
    Assignee: Ferrofluidics Corporation
    Inventor: Kuldip Raj
  • Patent number: 5952905
    Abstract: A coil separator for a deflection yoke capable of simplifying its manufacturing process by assembling accessory components on divided neck portions and screen portions and then connecting the neck portions to the screen portions. The coil separator includes a screen portion having a band portion formed on its conical lower end, a neck portion including a wire guiding portion and a yoke clamp fastening portion, and a connecting portion for connecting the neck portion to the screen portion. The connecting portion may include a plurality of projected pins and insertion holes formed on the neck portion and the screen portion, respectively, so that the projected pins fit into the insertion holes to connect the neck portion to the screen portion. As an alternative, the connecting portion may include a spacer which has a predetermined height and is inserted between the neck portion and the screen portion to adjust the length of the screen portion.
    Type: Grant
    Filed: October 18, 1996
    Date of Patent: September 14, 1999
    Assignee: Samsung Electro-Mechanics Co., Ltd.
    Inventors: Nam Soo Kim, Sam Gyu Hwang
  • Patent number: 5949314
    Abstract: An electromagnetic drive for a switch, preferably a motor protective circuit-breaker. The electromagnetic drive has a magnetic system, whose movable armature serves to actuate switching contact elements in the switch. The armature is coupled to a transmission lever by a leaf spring. One end the leaf spring is fixedly clamped and the other end of the leaf spring is connected to the transmission lever in such a way that the transmission lever is actuated when the leaf spring flexes and thus the free end of the leaf spring is displaced.
    Type: Grant
    Filed: September 3, 1998
    Date of Patent: September 7, 1999
    Assignee: ABB Patent GmbH
    Inventors: Karin Spengler, Jorg Stamm
  • Patent number: 5945901
    Abstract: A magnet head for a magnetic pick-up tool includes a magnet having a pick-up surface and a sleeve member having an open end and being slidably positioned over the magnet with the pick-up surface exposed through the open end, the sleeve member being made of a material acted upon by the magnet such that the magnet exerts a force upon the sleeve for maintaining the sleeve in a rest position wherein the open end extends beyond the pick-up surface, wherein the sleeve is slidable in a direction away from the pick-up surface and against the force to a withdrawn with respect to the magnet. A magnetic pick-up tool including a magnet head is also disclosed.
    Type: Grant
    Filed: August 18, 1997
    Date of Patent: August 31, 1999
    Assignee: Ullman Devices Corporation
    Inventors: Edward S. Coleman, Jr., Stanley Stromski