Sectional Plunger Patents (Class 335/264)
  • Patent number: 8493166
    Abstract: An electromagnetic actuating apparatus having an electromagnetic actuating unit which can be operated in order to exert an actuating force for an elongated plunger unit, wherein the actuating unit is provided in a housing along its actuating direction. The actuator unit forms an engagement surface which is planar in places and can be moved axially in the actuating direction, at an engagement end facing the plunger unit, an end surface of the plunger unit on the engagement side interacts detachably with the engagement surface, and the plunger unit is seated by magnetic attraction with its end surface on the engagement side on the engagement surface of the actuator unit, wherein the plunger unit is preferably designed to be soft-magnetic and furthermore preferably composed of soft iron, in the area of the end surface.
    Type: Grant
    Filed: August 3, 2009
    Date of Patent: July 23, 2013
    Assignee: ETO Magnetic GmbH
    Inventors: Thomas Golz, Thomas Schiepp
  • Publication number: 20100301244
    Abstract: A pole tube of a solenoid actuator including a non-magnetic intermediate piece having a first intermediate end face and a second intermediate end face, a pole piece having a pole end face configured to join the first intermediate end face at a first joining region, and a tube piece having a tube end face configured to join the second intermediate end face at a second joining region. At least two of the intermediate piece, the pole piece and the tube piece are configured to be connectable to each other using electric fusion. At least two of the intermediate piece, the pole piece and the tube piece have a different conductivity. A respective part of the pole and tube pieces disposed in corresponding first and second joining regions are configured to each have an electrical resistance substantially equal to an electrical resistance of a part of the intermediate piece.
    Type: Application
    Filed: January 9, 2007
    Publication date: December 2, 2010
    Applicant: Robert Bosch GmbH
    Inventors: Juergen Gruen, Christoph Giegerich, Roland Schempp
  • Patent number: 7637475
    Abstract: A solenoid is provided which, in the preferred embodiment, has a housing having an axial opening in it. The housing has a divider mounted in the axial opening to separate the axial opening into a first segment and a second segment. Respective ones of a first pole piece and a second pole piece are located on opposite sides of the divider. The first pole piece is moveable with the first segment between an extended position and a retracted position, the first pole piece having a plunger positioned at an end of the first pole piece. A permanent magnet is moveably mounted from the axial opening and is moveable independently of the second pole piece between at least a first position adjacent to the divider, and a second position adjacent the second pole piece. The construction provides a fast acting, low cost latching solenoid construction.
    Type: Grant
    Filed: March 26, 2007
    Date of Patent: December 29, 2009
    Assignee: Kurz-Kasch, Inc.
    Inventor: Ross R. Adams
  • Patent number: 7414504
    Abstract: A solenoid plunger for use in solenoid driven multi-line embossing systems is constructed of magnetic steel laminations that are attached to a center block which is machined to mount a solenoid shaft and anti-rotate pins. The laminations are attached to the center block with screws and vacuum epoxy glued for a very high cycle life. The laminated steel construction dramatically reduces eddy currents, which allows the magnetic field to rise and fall much more quickly than a conventional steel plunger. It also increases the magnetic force in the solenoid. This reduction in solenoid plunger eddy currents and increase of magnetic force in the solenoid structure itself operates to increase embosser throughput. The laminated steel construction further reduces embosser solenoid heating which also contributes to improved embossing control.
    Type: Grant
    Filed: June 14, 2006
    Date of Patent: August 19, 2008
    Assignee: DataCard Corporation
    Inventors: Robert W. Lundstrom, Peter E. Johnson
  • Patent number: 7301426
    Abstract: Electromagnetic actuator for operating at least one movable contact of a switch into a switched-on position or a switched-off position. The electromagnetic actuator (1) has a first magnetic circuit for making a movable (3) and a fixed (4) pole body move towards one another and a second magnetic circuit, separate from the first magnetic circuit, with a permanent magnet (9) and a retaining plate (10). A switching-off coil (15) operates to counteract the magnetic field in the second magnetic circuit so that the actuator (1) can return to a switched-off position. In the axial direction of the actuator (1), the switching-off coil (15) is positioned Gloser to the retaining plate (10) than the permanent magnet (9), as a result of which more effective operation of the actuator is possible. Furthermore, the actuator is constructed from cylindrical elements that are easy to produce and to assemble.
    Type: Grant
    Filed: April 22, 2004
    Date of Patent: November 27, 2007
    Assignee: Eaton Electric B.V.
    Inventor: Arend Jan Willem Lammers
  • Patent number: 7199687
    Abstract: A solenoid type device as a magnetic switch of a starter 10 comprises an exciting coil 3f that is energized and generates magnetic force, a plunger 3a that is a moving core which is a part of the magnetic circuit, and a fixed core 3j that faces the moving core and is also a part of the magnetic circuit. The moving core plunger 3a is divided into concentrically the first plunger 31 and the second plunger 32a. This configuration allows the second plunger 32a to be attracted first and then the first plunger 31a to be attracted. Thereby, it is possible to make a small and light magnetic switch while ensuring that the magnetic switch maintains sufficient attraction force as well as to increase reliability of operations of the magnetic switch even when battery voltage is low.
    Type: Grant
    Filed: August 1, 2003
    Date of Patent: April 3, 2007
    Assignee: Hitachi, Ltd.
    Inventors: Yasuhiko Maruhashi, Rikio Goto
  • Patent number: 7196602
    Abstract: A solenoid is provided which, in the preferred embodiment, has a bobbin having an axial opening in it. A divider is mounted within the opening. Respective ones of a first pole piece and a second pole piece are located on opposite sides of the divider. A permanent magnet is moveably mounted from the axial opening and is moveable independently of the second pole piece between at least a first position adjacent to the divider, and a second position adjacent the second pole piece. The construction provides a fast acting, low cost latching solenoid construction.
    Type: Grant
    Filed: May 16, 2005
    Date of Patent: March 27, 2007
    Assignee: Macon Electric Coil Company
    Inventors: Ross R. Adams, B. Thomas Wheless
  • Patent number: 6976667
    Abstract: A coupling unit provides a coupling between a valve element of an opening-closing valve and a moving element of an electromagnetic actuator so as to enable mutual movement of the two elements relative to each other within a predetermined restricted range. Accordingly, it is possible to provide an opening-closing valve driving apparatus that can reduce power consumption of the electromagnetic actuator and is excellent in responsivity.
    Type: Grant
    Filed: October 17, 2001
    Date of Patent: December 20, 2005
    Assignee: Mikuni Corporation
    Inventor: Tetsuo Muraji
  • Patent number: 6009615
    Abstract: A magnetic actuator (10) suitable for the operation of electric circuit breakers which uses a laminated yoke structure (12) to increase permanent magnet flux holding forces. The actuator comprises a magnetic yoke (12) which forms both low and high reluctance flux paths with at least one permanent magnet (30) and an armature (40) axially reciprocable in a first direction within the yoke (12). The actuator is configured to provide a first low reluctance flux path and a first high reluctance flux path when the armature (40) is in a first position and a second low reluctance flux path and a second high reluctance flux path when the armature (40) is in a second position. A pair of electromagnetic coils (60, 61) are used to drive the armature (40) between the first and second positions.
    Type: Grant
    Filed: March 7, 1996
    Date of Patent: January 4, 2000
    Assignee: Brian McKean Associates Limited
    Inventors: Brian McKean, Derek Kenworthy
  • Patent number: 5836001
    Abstract: A solenoid has a multistage telescoping plunger which together produce a single stroke. Each plunger stage has a separate air gap individually associated therewith. As the first air gap closes responsive to movement of a first telescoping plunger stage, a portion of the stator becomes magnetically saturated; however, magnetic material has moved with the first plunger stage in order to bridge the saturated position which switches the flux path to a second air gap via a second of the telescoping plunger stages. An advantage is that the solenoid has a long stroke with a high pulling force on both the initial and the final ends of a continuous stroke formed by the separate movements of the first and second plunger stages.
    Type: Grant
    Filed: September 8, 1997
    Date of Patent: November 10, 1998
    Assignee: MPC Products Corporation
    Inventors: Jerry D. Hielkman, Gary A. Sparks, David J. Treadwell
  • Patent number: 5422617
    Abstract: A multiple coil, multiple armature solenoid is disclosed. The solenoid has; multiple armatures slidably disposed on a common slip shaft, with separate coils disposed about the corresponding armatures. The conductor coils, through magnetic induction, displace the armatures through respective linear strokes along the slip shaft. By varying the stroke length of the various armatures, it is possible to use an armature that travels through a short stroke length to generate kinetic energy that is transferred through the slip shaft to actuate an armature that must travel through a longer stroke length. In this manner, the problem of a high breakaway force associated with a long stroke armature is resolved.
    Type: Grant
    Filed: May 28, 1993
    Date of Patent: June 6, 1995
    Assignee: IMC Magnetics Corp.
    Inventor: Michael H. Brown
  • Patent number: 5394132
    Abstract: A motion producing device in the form of a linear actuator, circular pump, or a robotic or prosthetic limb which functions to produce many kinds of work is provided. The device includes a linear series of alternately spaced fixed and polarity reversible magnets. The fixed and polarity reversible magnets may have more than one magnet assembled as a force unit of magnets of fixed polarity or reversible polarity which is surrounded by a rigid electrically insulating material and that carries rigid electrical conductors in the form of tubes. Between each magnetic force unit is an elastic electrically insulating material allowing expanding or shrinking of the distance between the magnetic force units in accordance with the polarity reversal of the reversible magnetic force units. The elastic expansion or contraction material carries flexible elastic tubes that connect with the rigid tubes to hold a current carrying electrolyte to carry electrical current from a D.C.
    Type: Grant
    Filed: July 20, 1993
    Date of Patent: February 28, 1995
    Inventor: James E. Poil
  • Patent number: 5241292
    Abstract: A three position electrically operated actuator has a self centering system so that if power is off for the actuator, it returns to a central position. The actuator comprises a center cavity with a first solenoid on one side and a second solenoid on the other side, a shaft extends through the center cavity and is joined to a first magnetic core of the first solenoid and a second magnetic core for the second solenoid. The shaft has a connection at least at one end for connection to a gearbox or the like. When the first solenoid is energized the shaft moves axially in one position so the connection is at a first position, when the second solenoid is energized, the shaft moves axially in the opposite direction so the connection is at a second position. A coil spring is provided in the cavity, and when neither solenoid is energized the spring moves the shaft so the connection is in a third position midway between the first position and the second position.
    Type: Grant
    Filed: May 28, 1992
    Date of Patent: August 31, 1993
    Assignee: Prime Mover, Inc.
    Inventors: John I. Bjorknas, Peter J. Druet
  • Patent number: 5010312
    Abstract: A solenoid actuator that includes a ferromagnetic armature body mounted for movement through a defined stroke in the direction of its central axis. A stator includes an electrical coil surrounding the axis of the armature, and a ferromagnetic stator body having a first portion axially opposed to the armature body and a second portion radially surrounding and spaced from the armature body. A ferromagnetic ring is positioned on the armature body radially adjacent and opposed to the second portion of the stator body. The opposed surfaces that define the air gap between the armature ring and the stator body are of identical conical construction and overlap each other as viewed in the axial direction.
    Type: Grant
    Filed: April 10, 1990
    Date of Patent: April 23, 1991
    Assignee: Rostra Engineered Components
    Inventor: Krystyn Motykiewicz
  • Patent number: 4533888
    Abstract: A remotely controlled circuit control device has first and second load contact assemblies movable into circuit engagement and circuit disengagement positions relative to one another in which one load contact assembly is operatively connected to a solenoid so that alternate forward strokes of the solenoid moves the one load contact assembly between reset and tripped positions through a push-push mechanism having an indexing portion and a latching portion. An overload mechanism cooperates with the latch portion to cause the load contact assemblies to move to the circuit disengaged position upon occurrence of a fault condition. The second load contact assembly includes pivotably mounted contact members which are linked to the first load contact assembly in such a way that circuit engagement during solenoid energization is precluded.
    Type: Grant
    Filed: August 7, 1984
    Date of Patent: August 6, 1985
    Assignee: Texas Instruments Incorporated
    Inventors: Aime J. Grenier, Lyle E. McBride
  • Patent number: 4522372
    Abstract: An electromagnetic valve which can control a fluid flow in dual mode, i.e. a small amount of fluid at a first step and a large amount of fluid at a second step, which adopts a bypass means of magnetic flux for obtaining the first step and a resistance means that does not allow the magnetic flux to flow in the first step while it allows it to flow in the second step for obtaining the second step.
    Type: Grant
    Filed: November 21, 1983
    Date of Patent: June 11, 1985
    Assignee: Nippondenso Co., Ltd.
    Inventors: Kiyotoshi Yano, Yutaka Suzuki, Yoshichika Yamada
  • Patent number: 4438419
    Abstract: A linear solenoid device comprises a cylindrical armature or plunger freely movable within the central opening of a stator which comprises a cylindrical coil wound between a pair of annular end pole members and surrounding one or more intermediate annular pole members. The intermediate pole members are axially spaced and aligned with the end pole members by a bobbin which preferably is injection molded. The armature has plural axially spaced and aligned annular pole members concentrically arranged within the central opening of the single cylindrical coil. The magnetic stator and armature poles take the form of rings which are dimensioned and arranged so that the magnetic flux generated by the coil passes in a series path alternately from the stator to the armature rings and then through a cylindrical magnetic casing which forms a magnetic flux path between the end pole members. The armature includes a support body of non-magnetizable material which may be plastic and can be injection molded.
    Type: Grant
    Filed: July 28, 1982
    Date of Patent: March 20, 1984
    Assignee: International Business Machines Corporation
    Inventor: Edward F. Helinski
  • Patent number: 3988706
    Abstract: A fast-action solenoid actuating mechanism operable against high opposing loads and wherein the load being moved is connected to the solenoid armature by energy storing means effective to store increasing amounts of energy as the armature moves toward its retracted position. The energy storing means typically comprises a plurality of springs having very substantially differing spring rates and so arranged that initial movement of the armature is opposed primarily by the lower rate spring means and thereafter by the higher rate spring means until the accumulated stored energy together with the magnetic energy exceeds a required load operating force as the armature moves into its fully retracted position. All stored energy is automatically released during the final approach to retracted position and the armature is free to return to its extended position when the solenoid is de-energized. The mechanism may be utilized to operate a wide variety of devices such as switches, relays, valves, etc.
    Type: Grant
    Filed: April 10, 1975
    Date of Patent: October 26, 1976
    Assignee: Circle Seal Corporation
    Inventor: Colby M. Springer
  • Patent number: 3952272
    Abstract: A magnetic core construction for solenoids or electromagnets, comprising a plurality of unique magnetic laminations adapted to be stacked one on another into a pile. The laminations have interlocking means whereby, when stacked in a certain manner, the pile formed thereby constitutes a loose assemblage which cannot readily be dismantled. Also, such assemblage has the important feature that the adjoining laminations can all be spaced from each other a predetermined extent or else completely and tightly brought together into a compact mass. Means are provided for connecting a drive or linkage member to an end lamination whereby the forces involved in bringing together the laminations can be harnessed to produce useful output or work which is characterized by a more gradual build-up of the output force. The compacting of the assemblage is effected by the application of magnetic flux thereto, as by energizing a magnet coil of insulated wire, operatively associated with the laminations.
    Type: Grant
    Filed: February 12, 1975
    Date of Patent: April 20, 1976
    Inventor: Alleyne C. Howell, Jr.