Teltec, Incorporated

Kearney-national Inc.

Minnesota Technical Research, Inc.

Edwin J Luetzow

Robert H Luetzow

A low cost Hall effect position sensor is disclosed which includes a Hall effect integrated circuit disposed in close proximity to a metallic target device. The Hall device is mounted on a flanged flux dispersion pole piece. The opposite end of the pole piece is attached to a rare earth or Alnico magnet. The flanged magnetic flux dispersion pole piece is designed to disperse a highly concentrated magnetic flux field from a magnet, typically an Alnico or rare earth magnet, into a low intensity magnetic flux field which is compatible with the Hall effect device as well as constant and evenly dispersed across the face of the flanged pole piece. The area of the dispersion flange face is designed so measured magnetic field in an air gap between the dispersion pole piece and a ferrous target is increased by a factor of 3 when compared to an open circuit field intensity field measurement at the surface of the dispersion pole piece. The open circuit field intensity of the sensor is below the release point of the Hall effect device. When a metallic body or ferrous target is near, the flux at the face of the dispersion pole piece is increased above the operate point of the Hall device and the digital Hall device is activated or 'turned on.' The dispersion flanged pole piece, the magnet and the Hall device function as an accurate low cost position sensor.

Hall effect position sensor with flux limiter and magnetic dispersion

Noble plated tungsten corona wire for copy machine or xerography technology machines and method of securing terminal connectors to the ends of the noble plated tungsten corona wire. The terminal or crimping tab have compound radii to provide for a solid-state diffusion weld and to prevent stress at a junction of the wire and the terminal or the crimping tab.

Noble plated tungsten corona wire for copy machines or xerography

A low cost Hall effect position sensor is disclosed which includes a Hall effect integrated circuit disposed in close proximity to a metallic target device. The Hall device is mounted on a flanged flux dispersion pole piece. The opposite end of the pole piece is attached to a rare earth or Alnico magnet. The flanged magnetic flux dispersion pole piece is designed to disperse a highly concentrated magnetic flux field from a magnet, typically an Alnico or rare earth magnet, into a low intensity magnetic flux field which is compatible with the Hall effect device as well as constant and evenly dispersed across the face of the flanged pole piece. The area of the dispersion flange face is designed so measured magnetic field in an air gap between the dispersion pole piece and a ferrous target is increased by a factor of 3 when compared to an open circuit field intensity field measurement at the surface of the dispersion pole piece. The open circuit field intensity of the sensor is below the release point of the Hall effect device. When a metallic body or ferrous target is near, the flux at the face of the dispersion pole piece is increased above the operate point of the Hall device and the digital Hall device is activated or 'turned on'. The dispersion flanged pole piece, the magnet and the Hall device function as an accurate low cost position sensor.

Solenoid for use in harsh difficult environmental conditions for actuation in a pulling motion along a straight line where the magnetic core travels within a stainless steel non-magnetic sleeve. The core uses a plurality of broad Teflon rings fitted in broad annular grooves to reduce friction and wear along its path of travel, to reduce cross-section tangential point to point contact wear, and to prevent sacrificial corrosion of the moveable magnetic core or sleeve due to galvanic action when moisture is present. The core is zinc coated and the sleeve is stainless steel for the prevention of corrosion and rust in order to ensure a smooth and contaminant free inner surface for proper and unhampered movement of the core. Annular Teflon bearings are utilized, as moisture will not cause the Teflon bearing to freeze in low temperature applications.

Solenoid for use in harsh environment conditions

Flexible wire cable and the flexible wire cable by the steps of the process for manufacturing the flexible wire cable. The flexible wire cable interconnects between two spaced plurality of terminals. The terminals can be equally centered at opposing ends or can be spaced on different centers at opposing ends. A plurality of wire conductors are laminated between two sheets of insulation, each sheet having a thermosetting polyester adhesive coating, which partially and fully cures as a function of time-temperature-pressure. Each of the plurality of wire conductors are substantially surrounded internally one hundred and eighty degrees by each sheet of the insulation. The insulation is offset to provide an overlap at opposing ends or at only one end to provide a solder stop and controlled flexings of the wire conductors. In another embodiment, at least one metallic shield is laminated to one side of the insulation sheet with like thermosetting polyester adhesive coating on the metallic sheet which cures as a function of time-temperature-pressure. A drain wire extends the length of the metallic shield and is tinned so that it is subsequently conductively bonded to the metallic shield.

Flexible wire cable and process of making same

A method of preparing stranded electrical conductors for subsequent attachment to the terminal pad of an electrical device or component whereby the tip portion of said conductors are fused to form a coalescent bead. The stranded wire conductor is placed in a holding fixture and the end surface thereof is brought into engagement with an electrode member. The electrode is then displaced from the end of the wire by a predetermined gap distance. Subsequently, the air or other gas in the gap is ionized by a high frequency, high voltage electrical field, creating a low impedance for a low voltage current source. The current flowing from this source, through the electrode and through the gap is sufficient to fuse the strands of the conductor being treated at the tip end thereof and when cooled, a tiny coalescent bead of metal is formed. A suitable inert gas may also be introduced into the gap during the process to prevent oxidation of the metal during the fusion step.

Method for preparing electrical conductor

Process of making a multiple conductor flexible wire cable

A sealed enclosure means for an electrical switching array and a method of preparing such an enclosure, with the switching array employing a plurality of generally rigid terminal contact pins which extend outwardly from a wall of the enclosure. The wall through which the terminal contact pins extend has a plurality of slots formed therein, with the slots having contact pin engaging edges. The material from which the wall is fabricated through which the terminal contact pins extend is generally resilient, and the slots which are formed therein to receive the contact pins have a width which is less than the pin thickness so as to cause the slot edges to temporarily form a lip seal about the surface of the pin. The terminal contact pins are then heated so as to cause the thermoplastic resilient material to flow to form a seal about the periphery of the contact pin. The temporary lip seal protects the structure against intrusions of solder flux which is used in preparation for the solder dip operation, while the subsequently formed seal (due to flow of thermoplastic material) protects against intrusions of cleaning solvents and the like which are utilized subsequently to remove the residual solder flux.

Growing community of inventors

Farmington, MN, United States of America

Edwin J Luetzow