Magnetic Plug Type (e.g., Crankcase Plug) Patents (Class 335/305)
  • Patent number: 11396976
    Abstract: An axle assembly that includes a housing assembly and a dipstick assembly. The housing assembly may at least partially define a cavity that receives a lubricant. At least a portion of the dipstick assembly may be removably mountable to the housing assembly and may include a fitting and a dipstick.
    Type: Grant
    Filed: March 10, 2021
    Date of Patent: July 26, 2022
    Assignee: ArvinMeritor Technology, LLC
    Inventors: Andrew Bodary, Mailys Eichsteadt, Ginger St. Cyr, Florin Patrascu
  • Patent number: 11059051
    Abstract: A magnetic filtration device for installing into an opening of a reservoir, including, but not limited to acting as a replacement to a standard drain plug commonly positioned at the bottom of the reservoir. The magnetic filtration device may attract and capture magnetic (ferromagnetic) particulate circulating throughout a mechanical system. Applications for the device include engines, motors, pumps, compressors, gear boxes, transmissions, hydraulic systems, fuel systems and generators. The magnetic filtration device may comprise a magnet core enclosed within a magnet casing, with additional rods affixed to and/or arranged around the magnet casing to alter the radius of the magnetic field.
    Type: Grant
    Filed: March 6, 2020
    Date of Patent: July 13, 2021
    Assignee: FilterMag International, Inc.
    Inventors: David Neshat, Wayne Johnson, Randy Yount
  • Patent number: 10654047
    Abstract: A magnetic filtration device for installing as a replacement to a standard drain plug commonly positioned at the bottom of the reservoir. The magnetic filtration device may attract and capture magnetic (ferromagnetic) particulate circulating throughout a mechanical system. Applications for the device include engines, motors, pumps, compressors, gear boxes, transmissions, hydraulic systems, and generators. The magnetic filtration device may comprise a magnet core enclosed within a magnet casing, with additional magnetic rods affixed to and/or arranged around the magnet casing.
    Type: Grant
    Filed: February 1, 2018
    Date of Patent: May 19, 2020
    Assignee: FILTERMAG INTERNATIONAL, INC.
    Inventors: Randy Yount, Wayne Johnson
  • Patent number: 9116670
    Abstract: A surface contact for a support component is described. The support component, for example, can serve as a “kickstand” that can be positioned to support the apparatus in a variety of orientations relative to an adjacent surface. A surface contact disposed on the support component can serve as an interface (e.g., a “foot”) for the support component on the adjacent surface. For instance, the surface contact can be formed from a slip-resistant material such that slippage of the support component on an adjacent surface is reduced or eliminated. In at least some embodiments, the surface contact is embedded with a material that responds to a magnetic field, e.g., a ferromagnetic material. The surface contact is attracted to magnets on an adjacent edge of the attached apparatus, thus stabilizing the support component in a closed position.
    Type: Grant
    Filed: June 21, 2013
    Date of Patent: August 25, 2015
    Assignee: Microsoft Technology Licensing, LLC
    Inventors: Kurt Allen Jenkins, Joseph B. Gault
  • Patent number: 9071672
    Abstract: A cover is described that is magnetically attached to a tablet device. The cover includes at least as flap. In the described embodiment, the flap includes a plurality of segments where the first segment includes a first plurality of edge attach magnets arrayed along a first edge of the flap and where a second segment includes a second plurality of edge attach magnets arrayed along a second edge of the flap opposite the first edge.
    Type: Grant
    Filed: January 5, 2015
    Date of Patent: June 30, 2015
    Assignee: Apple Inc.
    Inventors: Samuel G. Smith, Jared A. Sartee, Florence W. Ow, Andrew D. Lauder, Jeremy C. Franklin
  • Patent number: 8819921
    Abstract: There are provided a process of forming a recess groove having a depth shallower than and a width larger than the notch groove for fracturing at a portion of fracturing and splitting in the permanent magnet; a process of forming the notch groove for fracturing the permanent magnet in a groove bottom of the recess groove formed in the recess-groove forming process; and a process of fracturing and splitting the permanent magnet along the notch groove so as to obtain magnet pieces.
    Type: Grant
    Filed: April 22, 2011
    Date of Patent: September 2, 2014
    Assignee: Nissan Motor Co., Ltd.
    Inventor: Shuuji Adachi
  • Patent number: 8356400
    Abstract: An improved method for manufacturing a field emission structure is provided that involves receiving magnets from a magnet supplying device and placing each one of the magnets at a corresponding location of a plurality of location of the field emission structure. The corresponding location and a corresponding orientation of each of the magnets relative to each other are defined in accordance with a code.
    Type: Grant
    Filed: September 8, 2008
    Date of Patent: January 22, 2013
    Assignee: Correlated Magnetics Research, LLC.
    Inventors: Larry W. Fullerton, Mark D. Roberts
  • Patent number: 8347482
    Abstract: A method for manufacturing a ferrite magnet device including a ferrite body and first and second center electrodes arranged so as to intersect and be electrically insulated from each other and a permanent magnet arranged to apply a direct current magnetic field to the ferrite body and a method for manufacturing an isolator or a composite electronic component, which include the ferrite magnet device. A magnetic force of the permanent magnet is adjusted using a measurement jig and a magnetic force adjusting apparatus while the permanent magnet is fixed to a principal surface of the ferrite body.
    Type: Grant
    Filed: March 11, 2009
    Date of Patent: January 8, 2013
    Assignee: Murata Manufacturing Co., Ltd.
    Inventor: Takashi Hasegawa
  • Patent number: 8118725
    Abstract: An implantable magnet that can freely turn in response to an external magnetic field, thus avoiding torque and demagnetization on the implantable magnet. The implantable magnet can be combined with an electric switching function depending on the orientation of an external magnetic field, thus protecting an implanted coil and/or implant electronics against induction of over-voltage or performing an electric switching function for other various purposes. The magnetic switch may further include, for example, a first switching contact and a second switching contact. A magnetically soft body that includes an electrically conductive surface is shiftable between a first position where the body is in simultaneous contact with the first and second switching contacts, and a second position where the body is out of contact with at least one of the first and second switching contacts.
    Type: Grant
    Filed: May 26, 2011
    Date of Patent: February 21, 2012
    Assignee: MED-EL Elektromedizinische Geraete GmbH
    Inventors: Martin Zimmerling, Erwin Hochmair
  • Patent number: 7976453
    Abstract: An implantable magnet that can freely turn in response to an external magnetic field, thus avoiding torque and demagnetization on the implantable magnet. The implantable magnet can be combined with an electric switching function depending on the orientation of an external magnetic field, thus protecting an implanted coil and/or implant electronics against induction of over-voltage or performing an electric switching function for other various purposes. The magnetic switch may further include, for example, a first switching contact and a second switching contact. A magnetically soft body that includes an electrically conductive surface is shiftable between a first position where the body is in simultaneous contact with the first and second switching contacts, and a second position where the body is out of contact with at least one of the first and second switching contacts.
    Type: Grant
    Filed: July 6, 2009
    Date of Patent: July 12, 2011
    Assignee: MED-EL Elektromedizinische Geraete GmbH
    Inventors: Martin Zimmerling, Erwin Hochmair
  • Patent number: 7757376
    Abstract: A magnetic circuit is made by magnetically attracting a permanent magnet segment of a partially circular arc in cross section to an outer peripheral surface of a center rod, causing the magnet segment in a magnetically attracted state to face a yoke member, using a nonmagnetic supporter to regulate the magnet segment in position, extracting the center rod from the magnet segment in a position-regulated state, and magnetically attracting and fixing the magnet segment to the yoke member.
    Type: Grant
    Filed: September 12, 2006
    Date of Patent: July 20, 2010
    Assignee: TDK Corporation
    Inventors: Shigeo Saitou, Mitsutoshi Tanaka, Kouji Mitake
  • Patent number: 7566296
    Abstract: An implantable magnet that can freely turn in response to an external magnetic field, thus avoiding torque and demagnetization on the implantable magnet. The implantable magnet can be combined with an electric switching function depending on the orientation of an external magnetic field, thus protecting an implanted coil and/or implant electronics against induction of over-voltage or performing an electric switching function for other various purposes. The magnetic switch may further include, for example, a first switching contact and a second switching contact. A magnetically soft body that includes an electrically conductive surface is shiftable between a first position where the body is in simultaneous contact with the first and second switching contacts, and a second position where the body is out of contact with at least one of the first and second switching contacts.
    Type: Grant
    Filed: June 27, 2006
    Date of Patent: July 28, 2009
    Assignee: MED-EL Elektromedizinische Geraete GmbH
    Inventors: Martin Zimmerling, Erwin Hochmair
  • Patent number: 7541907
    Abstract: An auto-aligning and connecting structure used to connect and align an electronic device and an accessory, wherein a plurality of first magnetic bodies are disposed on a first surface of the electrical device and a plurality of second magnetic bodies are disposed on a second surface of the accessory. The magnetic pole of the first magnetic bodies and the second magnetic bodies are appropriately arranged so the first magnetic bodies and the second magnetic bodies can attract each other when the first surface and the second surface approach each other. Then, the electronic device and the accessories are connected to each other when the first surface and the second surface connect.
    Type: Grant
    Filed: July 12, 2006
    Date of Patent: June 2, 2009
    Assignee: High Tech Computer Corp.
    Inventors: Yi-Shen Wang, John C. Wang
  • Patent number: 7507136
    Abstract: A set of magnetic blocks by which connection is made between blocks through a force attracting multiple ferrous protrusions on one face to multiple recessed magnets on another face. The multiple points of magnetic connection provide alignment and rigidity to the assembled structure.
    Type: Grant
    Filed: December 8, 2006
    Date of Patent: March 24, 2009
    Inventor: Claire Jean Patton
  • Patent number: 7504921
    Abstract: An actuator for moving a load has a frame forming a race between two surfaces thereof, at least two elements joined together by at least one flexible member, the elements and the at least one flexible member being disposed between the two surfaces of the frame that forms a race, one of the elements further joined to the load by a portion of the at least one flexible member, wherein when an element comes into contact with a surface of the frame it will stick thereto absent a repelling force, and moving means disposed to selectively attract or repel a corresponding element towards or away from one or the other of the two surfaces of the frame that forms the race. The actuator effects movement of the load in a direction towards or away from the elements, by changing a position of at least one of the elements on a surface of the frame that forms the race.
    Type: Grant
    Filed: September 29, 2006
    Date of Patent: March 17, 2009
    Assignee: United States of America as represented by the Administrator of the National Aeronautics and Space Adminstration
    Inventor: John M. Vranish
  • Patent number: 6717498
    Abstract: A magnetic body includes a disc-shaped carrier having one or more layers of magnetic powder that is blended with a viscous liquid and sprayed on outer surfaces of the carrier. Magnetic lines of the magnetic body together with earth poles produce a radiated magnetic field. When the magnetic body is positioned in a vehicle fuel tank cap, the radiated magnetic field produced by the magnetic body causes magnetization and rearrangement of fuel surface molecules and/or air molecules in the limited space in the fuel tank to enable effective fuel volatilization and accordingly upgraded kinetic energy efficiency of a vehicle engine.
    Type: Grant
    Filed: March 4, 2003
    Date of Patent: April 6, 2004
    Inventor: Jen-Chieh Wang
  • Publication number: 20030214374
    Abstract: A magnetically coupled switch that utilizes a flex armature has a user manipulated holder that carries at least one magnetic coupler made of magnetic material. The flex armature is a substantially flat piece of flexible magnetic material that is magnetically attracted to the at least one magnetic coupler. A carrier layer having electrical conductors formed thereon is intermediate the flex armature and magnetic coupler such that the electrical conductors are electrically connected by the flex armature where the flex armature is magnetically attracted to the magnetic coupler. In the absence of a magnetic coupler, the flex armature is normally spaced from the electrical conductors on the carrier layer. Preferably, there is a bottom cover that encloses a cavity that contains the flex armature, and the bottom cover includes at least one shock dimple that secures at least part of the flex armature to the carrier layer.
    Type: Application
    Filed: May 14, 2002
    Publication date: November 20, 2003
    Applicant: DURASWITCH
    Inventor: Anthony J. Van Zeeland
  • Patent number: 6503393
    Abstract: An oil pan containing a magnetic filter apparatus includes an oil pan member having a magnet assembly reception channel. A magnetic filter assembly is received in the magnet assembly reception channel, and attachment means are provided for attaching the magnetic filter assembly to the oil pan member. The magnetic filter assembly separates ferro-magnetic particles from oil in the oil pan member and traps the separated particles on the magnetic filter assembly. The magnetic filter assembly includes a magnet support unit which is attachable to the attachment means. A magnet unit is supported by the magnet support unit. The magnet unit provides a high magnetic flux region to circulating oil in the vicinity of an oil pump intake tube for trapping metal particles on the magnetic filter assembly. The magnet unit includes a plurality of individual magnets arrayed in highly cohesive relationship.
    Type: Grant
    Filed: March 31, 2001
    Date of Patent: January 7, 2003
    Inventor: Joseph C. Caiozza
  • Patent number: 6078238
    Abstract: A bolt to be screwed-in into a lubricant-containing housing, including a magnet (4), a head portion (2) having rotation-transmitting surfaces, and a shank portion (3) extending from the head portion (2) and having an outer thread (31) and a recess (32) provided at a free end of the shank portion (3) for form-lockingly receiving the magnet (4) and having a depth (T) measured from the free end of the shank portion (3) and substantially corresponding to an axial width of the magnet (4).
    Type: Grant
    Filed: May 26, 1998
    Date of Patent: June 20, 2000
    Assignee: Hilti Aktiengesellschaft
    Inventor: Peter Gerold
  • Patent number: 5949317
    Abstract: A magnet set forth used is in a drain plug. A drain plug is assembled with an attached holder securing an inserted cylindrical magnet. The drain plug is formed of non ferrous material such as brass, aluminum, stainless steel, etc. It is constructed in accordance with industry standards to fit as a replacement device in oil drain pans, and is non ferrous material. It incorporates an extending threaded shaft. The holder is constructed with an axial passage there through having threads at the small end for threading through the drain plug. The passage extends fully through the device, interrupted by a transverse internal registration shoulder at the middle, and defines an extending skirt fitting loosely around an elongate cylindrical rare earth magnet.
    Type: Grant
    Filed: March 31, 1998
    Date of Patent: September 7, 1999
    Inventors: Randy Fink, Bruce Erickson
  • Patent number: 5564526
    Abstract: A drain plug has an interior cylindrical component with exterior screw threads adapted to be threadedly secured with respect to a threaded aperture in a crank case. The drain plug also has an enlarged exterior head with an external periphery. The drain plug is fabricated of steel. An attachment is positionable over the periphery of the head. The attachment is of a length essentially equal to the length of the head of the drain plug. The attachment has an internal periphery of a configuration adapted to be slidably received over the periphery of the drain plug. The attachment has an external periphery in a configuration. The attachment is fabricated of a permanently magnetized material with a north pole adjacent one end and a south pole adjacent the opposite end whereby the magnetized nature of the attachment will magnetize the head of the drain plug as well as its cylindrical component to attract metal particles.
    Type: Grant
    Filed: August 21, 1995
    Date of Patent: October 15, 1996
    Inventor: Charles E. Barnard
  • Patent number: 5465078
    Abstract: A magnetic drain bolt comprising a bolt body and a magnet. The bolt body comprises of a male-threaded member and a head member, the male-threaded member having a fastening protuberance formed at an end thereof. The magnet is comprised of a sintered ferrite material and has a recess formed at a bottom end thereof for receipt of the fastening protuberance, the recess having a depth sized equivalent to a height of the fastening protuberance, the magnet having a diameter slightly smaller than a diameter of the male-threaded member. The fastening protuberance is secured with an adhesive to the magnet within the recess whereby the fastening protuberance provides additional support for securing the magnet to the bolt body.
    Type: Grant
    Filed: February 23, 1995
    Date of Patent: November 7, 1995
    Assignee: Illinois Tool Works Inc.
    Inventor: James D. Jones, Jr.
  • Patent number: 5420557
    Abstract: A magnetic drain plug comprises a resilient plastic plug member and a permanent magnet disposed therein. The plug member has a threaded upper section, a medial flange, and a lower head section with engagement surfaces for a hand tool such as a wrench. An axial bore formed through the plug member defines a tapered upper channel, a medial chamber, and a lower aperture therein. The chamber has a section larger than that of the adjoining channel or aperture. The magnet is forcibly inserted through the upper channel, which is in communication with the interior of a lubricating housing when the plug is mounted therein, so as to snap fit into the conformingly shaped chamber. The lower aperture brings the magnet into communication with ambient air to assist cooling.
    Type: Grant
    Filed: March 15, 1993
    Date of Patent: May 30, 1995
    Inventor: Yih-Jyh Chern
  • Patent number: 5314625
    Abstract: The external oil pan magnet (10) is placed on the external surface of the oil pan (2) where it attracts and captures metallic particles suspended in a motor's oil supply. In a first embodiment, the external oil pan magnet (10) is comprised of magnet (12) coupled to a channeled shield (14). The shield (14) leaves at least one surface of the magnet exposed and amplifies the magnetic force of the magnet. The exposed surface magnetically attaches to the external surface of the oil pan (2). After the oil is drained during normal maintenance, the operator slides the magnet assembly across the bottom of the pan and over the oil pan plug hole. Metallic debris is evacuated through the oil pan plug hole. The plug is replaced and the oil supply replenished. In a second embodiment, the magnet assembly is configured to encircle the oil pan plug. The magnet temporarily magnetizes the plug which attracts metallic debris from the oil.
    Type: Grant
    Filed: December 29, 1992
    Date of Patent: May 24, 1994
    Inventor: Michael Farnelli
  • Patent number: 4995971
    Abstract: A dual purpose automatic transmission oil pan (10) for covering transmission components (20,22) and containing a reservoir of oil in a sump portion (32). First and second drainback channels (34,36) extend to the sump portion (32) from spaced drain openings (16,18) of a closed-barrel transmission case (14) which permit free flow of oil to the sump portion (32). A magnetic filter (40) is secured to a ramp surface (44) at the confluence of the oil flows (A,B) from the first and second drainback channels (34,36) for removing ferrous contaminants from the oil. An inlet port (26) of a filter cartridge opens into an inlet port region (46) of the sump portion (32).
    Type: Grant
    Filed: August 7, 1989
    Date of Patent: February 26, 1991
    Assignee: Ford Motor Company
    Inventors: Timothy A. Droste, Jerome J. Middione, Himat B. Kher
  • Patent number: 4894153
    Abstract: A plurality of magnets are detachably attached to the exterior of the cylindrical casing of a liquid filter unit to attract and capture ferromagnetic particles from the fluid, particles too small to be captured by the basic filtering element but large enough to cause further harm if allowed to remain free in the liquid. The magnets are magnetized such that their ends are north or south poles and shaped so that the ends are in close, positive contact with the casing. The attachment apparatus comprises springs interconnecting the magents and links and springs to position the magnets in the lengthwise direction of the casing.
    Type: Grant
    Filed: November 28, 1988
    Date of Patent: January 16, 1990
    Inventor: Hossain A. Shirdavant
  • Patent number: 4851116
    Abstract: A magnet filter for removing magnetic metal powder mixed with oil in an oil reservoir or the like which is easily mounted to and dismounted from the oil reservoir. The magnet filter includes a recess formed on a top surface of a screw head having a screw rod studded on its bottom surface and a permanent magnet piece is fitted in the recess.
    Type: Grant
    Filed: January 7, 1987
    Date of Patent: July 25, 1989
    Inventor: Kazuyuki Tomita
  • Patent number: 4810148
    Abstract: A drain bolt wherein a recess is formed at the end of a male-threaded portion of a bolt body, and a sinker portion of a synthetic resin magnet is embedded in the recess of the bolt body so that a projecting portion of the magnet is projected from the end of the male-threaded portion of the bolt body. The projecting portion of the synthetic resin magnet is larger in diameter than the sinker portion. A plurality of grooves are formed on the side of the projecting portion of the synthetic resin magnet along its length.
    Type: Grant
    Filed: February 8, 1988
    Date of Patent: March 7, 1989
    Assignee: Ishikawa Tekko Kabushiki Kaisha
    Inventors: Junzo Aisa, Eizi Kosugi
  • Patent number: 4763092
    Abstract: A magnetic filter consisting of a screw plug having a recess formed at the tip end of its screw rod portion and directed in the axial direction thereof, a rod-shaped permanent magnet piece fitted in the recess, and a non-magnetic member interposed between the permanent magnet piece and an inner circumferential surface of the screw rod portion defining the recess. The rod-shaped permanent magnet piece is magnetized so that magnetic poles may appear on its circumferential surface at diametrically opposite ends of its transverse cross-section, and the rod-shaped permanent magnet piece is axially projected from the tip end surface of the screw rod portion.
    Type: Grant
    Filed: May 20, 1987
    Date of Patent: August 9, 1988
    Inventor: Kazuyuki Tomita
  • Patent number: 4752759
    Abstract: The known magnet plug in which a cylindrical permanent magnet is fitted in and secured to a recess formed in a top surface of a threaded plug main body, is improved so that the permanent magnet can be firmly secured to the plug main body without damaging the threaded portion of the plug main body nor without magnetizing the threaded portion by the plug main body. The improvements reside in that a hollow cylindrical piece having a smaller outer diameter than that of the threaded portion of the plug main body is projected from the tip end surface of the threaded portion, a permanent magnet piece having an annular step formed on its outer peripheral surface has its bottom portion fitted in the hollow cylindrical piece, and the permanent magnet piece is fixedly secured to the plug main body by shrivelling the entire peripheral wall of the hollow cylindrical piece into the annular step.
    Type: Grant
    Filed: October 30, 1987
    Date of Patent: June 21, 1988
    Inventor: Tomita Kazuyuki
  • Patent number: 4568901
    Abstract: Elongate magnets are arranged about a copper fuel duct with each magnet having a like pole adjacent a flattened or faceted portion of the duct. Each magnet has a flat pole face and bevelled end edges with the bevelled end edges being in contact with the similar end edge of each adjacent magnet to define a tunnel through which the fuel duct runs. The duct is continuous through the magnet tunnel and terminates at each of its ends outside the tunnel in a peripheral bead or other attaching arrangement for coupling of the duct between a fuel source, such as a fuel pump, and a fuel consuming apparatus, such as a carburetor. The ducted fuel is thus exposed to flux lines of the magnets that are arranged about the fuel line to concentrate the lines of force at the fuel duct. The magnets and the fuel duct are held together by a surrounding capsule of non-magnetic material such as polypropylene plastic.
    Type: Grant
    Filed: November 21, 1984
    Date of Patent: February 4, 1986
    Assignee: A Z Industries
    Inventor: Harley J. Adam
  • Patent number: 4323843
    Abstract: Apparatus is provided for detecting ferrous contamination in a fluid such as engine transmission lubricant. The apparatus has two spaced apart electrodes, a magnetic flux extending between the electrodes the lines of force of which are substantially rectilinear, the electrodes being connectable to a circuit for signalling when an electrically conductive path is formed from one electrode to the other by metal particles attracted to the flux and formed into an electrode spanning bridge. For preference the sensor is a hollow plug, which in use is screwed into a transmission housing port, and has a flat end wall in contact with the lubricant in the housing. The plug contains a magnet having both poles disposed towards the plug end wall, a portion of the end wall acting as one electrode. A ferromagnetic disc mounted externally from the plug end wall, and electrically insulated therefrom, overlies the poles.
    Type: Grant
    Filed: November 30, 1979
    Date of Patent: April 6, 1982
    Inventor: Ian N. Batham
  • Patent number: 4254393
    Abstract: Fuel, such as flows from a fuel pump to a carburetor, is treated by subjecting the fuel to the influence of magnetic fields and thereafter an electric field; the magnetic fields are applied by a series of sets of spaced magnets aligned with each other.
    Type: Grant
    Filed: July 23, 1979
    Date of Patent: March 3, 1981
    Inventor: T. Garrett Robinson
  • Patent number: 4113611
    Abstract: A nonmetallic disc has a plurality of kerfs extending radially inwardly from the outer periphery. Magnets are disposed in the bottom of the kerfs so as to form a space between the magnets and the outer periphery of the disc to collect magnetic particulate material in this space. An eyelet is provided for attachment to a cable for pulling the disc through a pipe to remove magnetic debris therefrom.
    Type: Grant
    Filed: November 16, 1976
    Date of Patent: September 12, 1978
    Assignee: Westinghouse Electric Corp.
    Inventor: William G. Gohm
  • Patent number: 4100491
    Abstract: A ferrous metal detecting apparatus is disclosed for detecting metal particles in a flowing fluid, such as engine oil. The detecting apparatus has soft-iron pole pieces with a bridging gap therebetween. The soft-iron pole pieces are electrically insulated from each other and magnetized by direct current through an electromagnetic coil. After a sufficient amount of ferrous metal has accumulated on the bridging gap, a level detector will give a warning signal and cause the electromagnetic coil to degauss the soft-iron pole pieces by applying an alternating current to the electromagnetic coil. After the flowing fluid has washed away the ferrous metal, the direct current will remagnetize the soft-iron pole pieces. If repeated warning signals are within predetermined time intervals, an indication of the amount of ferrous metal contained in the fluid can be interpolated. The recycling for repeated warning signals may be automatically provided through a timing circuit and control logic.
    Type: Grant
    Filed: February 28, 1977
    Date of Patent: July 11, 1978
    Assignee: Southwest Research Institute
    Inventors: Francis Marion Newman, Jr., H. Stanley Silvus, Jr.
  • Patent number: 4070660
    Abstract: A wear particle detector for use with hydraulic systems, capable of collecting wear particles formerly suspended in the hydraulic fluid and of discriminating between larger and smaller particles by indicating the former, but destroying the latter automatically without causing detection, whereby both device functions are connected to and energized by the same single electric power supply and indicating circuit.
    Type: Grant
    Filed: February 20, 1976
    Date of Patent: January 24, 1978
    Inventor: Thomas E. Tauber
  • Patent number: 4008464
    Abstract: Apparatus for providing an electrical warning signal when ferrous contamination builds up in the lubricant of a mechanism utilizing gearing. The apparatus includes a pair of annular magnetic members positioned in a spaced-apart relation on a support member. The support member is attached to the lubricant filler plug so that the magnets are above the normal lubricant level within the mechanism, but are exposed to the normal lubricant flow during operation of the mechanism. The magnetic members are part of a normally-open electrical circuit in which one of the magnets is connected to a source of electrical potential and the other magnet is grounded. One portion of the circuit is then connected to an electrically-actuated warning device so that when ferrous contamination on one of the magnet members comes into contact with ferrous contamination on the other magnetic member, the circuit is closed and a warning signal is provided to the operator of the mechanism.
    Type: Grant
    Filed: October 7, 1975
    Date of Patent: February 15, 1977
    Assignee: Eaton Corporation
    Inventor: James R. Hobbie