With Plunger-type Armature Patents (Class 335/255)
  • Patent number: 4369419
    Abstract: A solenoid having a linear pull stroke includes a coil operated plunger (16) having a lost motion coupling (20,28,32,38,40) adapted to be connected with a load in order to allow the plunger (16) to retract a predefined distance during the initial part of the stroke thereby to develop a higher level of pulling force before substantial force is actually imparted to the load. The plunger (16) comprises an elongate body (18) having a piston-like link (28) slidably mounted in a cavity (20) at one end of the body (18) and adapted to be coupled with the load. A spring (36) trapped between the link (28) and the body (18) resets the link (28) relative to the body (18) before the pull stroke is completed.
    Type: Grant
    Filed: August 21, 1981
    Date of Patent: January 18, 1983
    Assignee: Caterpillar Tractor Co.
    Inventor: James I. Portscheller
  • Patent number: 4326696
    Abstract: A solenoid valve for opening and closing a fluid passage formed therein by the movement of a movable core in which a coil is wound around a resin bobbin and a stator core is fixed at one end portion of a center hole of the bobbin. A magnetic path plate having a ring-shaped portion and a flanged portion is insert-moulded in a body of the bobbin with a part of the flanged portion protruding radially to the outside of the body of the bobbin. The magnetic path plate is disposed such that the inner surface of the ring-shaped portion surrounds the outer surface of the moving core and the ring-shaped portion is concentric with the center hole of the bobbin. Since the protruding flanged portion is connected mechanically to one end of a yoke, a magnetic path is provided between the movable core and the yoke through the magnetic path plate with a reduced reluctance.
    Type: Grant
    Filed: June 8, 1979
    Date of Patent: April 27, 1982
    Assignee: Nippondenso Co., Ltd.
    Inventors: Eizi Ishikawa, Ryouichi Matsuura, Kiyotosi Yano
  • Patent number: 4322057
    Abstract: In an electromagnetically operated valve unit, a stationary core and a spring loaded moving-core are coaxially arranged within an axial bore extending across a lateral plate member of magnetic material, and a U-shaped yoke member of magnetic material has a head portion engaged with the stationary core and a pair of longitudinal arms which are supported by the opposite ends of the lateral plate member and fastened to a bracket. The lateral plate member is formed at its opposite ends with a pair of arms which are engaged with each outer face of the respective arms of the yoke member to uniform a magnetic path of the solenoid coil across the cores, the lateral plate member and the yoke member.
    Type: Grant
    Filed: April 11, 1980
    Date of Patent: March 30, 1982
    Assignee: Aisin Seiki Kabushiki Kaisha
    Inventors: Minoru Yamanaka, Hideo Haneda, Masatoshi Katoh, Mitsuyuki Suzuki
  • Patent number: 4305736
    Abstract: An impact device (15) applies hammer-like blows, or impact forces, to a metallic support frame (13) from which high-voltage electrodes (10) are suspended in an electrostatic precipitator in order to dislodge accumulated particulates from high-voltage electrodes (10). The impact device (15) is electrically isolated by an insulator (19) from metallic components of the precipitator other than the support frame (13) and components electrically connected to the support frame (13). The insulator (19) has a bore (18) that accommodates movement of the impact device (15) from a withdrawn position away from the support frame (13) to an impact position in contact with the support frame (13) upon energization and de-energization of a solenoid (17). The insulator (19) remains unstressed as the impact device (15) contacts the support frame (13).
    Type: Grant
    Filed: April 28, 1980
    Date of Patent: December 15, 1981
    Assignee: General Electric Co.
    Inventors: Melvin R. Kahl, Peter C. Gelfand
  • Patent number: 4293835
    Abstract: A solenoid for an electric starting motor housed in a generally cylindrical plastic cup. A pair of diametrically arranged fixed contacts penetrate the end wall, forming binding posts for a load circuit. A magnetic sub-assembly is provided consisting of an armature and wound bobbin surrounded by a hollow magnetic annulus having axial clearance openings. A movable contact sub-assembly includes a conductive disc mounted on an axial plunger which is seated against the armature. The disc has, on its opposite side, a return spring. When control current is applied the armature is sucked into the annulus overcoming the force of the return spring and shifting the conductor disc into seated engagement with the fixed contacts thereby completing the load circuit. The disc and fixed contacts both have substantial axial and radial thickness providing high heat capacity as well as high conductivity for prompt dissipation of heat.
    Type: Grant
    Filed: January 28, 1980
    Date of Patent: October 6, 1981
    Assignees: Roper Corporation, Electromation, Inc.
    Inventors: Robert K. Davis, Michael J. Myers
  • Patent number: 4240468
    Abstract: A solenoid operated shutoff valve for compressed air has a tubular ferromagnetic core which is surrounded by an excitable coil and confines a reciprocable ferromagnetic plunger movable into and from sealing engagement with a fixedly mounted valve seat. The seat is installed in one of two coaxial tubular sections of the core and the other section has an axial opening for admission of compressed air to one end face of the plunger so that the other end face of the plunger normally bears against and seals the fluid evacuating opening in the seat. The periphery of the plunger is formed with straight and/or helical grooves defining discrete paths for the flow of compressed gas from the other section of the core into the opening of the seat when the coil is energized to propel the plunger away from the seat. The plunger may be formed with an axial bore which establishes a further path for the flow of compressed air into the opening of the seat.
    Type: Grant
    Filed: March 16, 1978
    Date of Patent: December 23, 1980
    Assignee: Hauni-Werke Korber & Co. KG
    Inventors: Peter Brand, Adolf Helms
  • Patent number: 4233585
    Abstract: An electromagnet of the plunger type is disclosed which includes a plunger body and a guide for guiding the plunger body in its sliding movement. The plunger body is formed with a resin coat on the surface thereof which is brought into sliding contact with the guide, and the guide is formed with a resin at least in a portion thereof which is brought into sliding contact with the plunger body, so that in the electromagnet the magnetic resistance may be reduced and the sliding characteristics and the wear resisting property may be improved.
    Type: Grant
    Filed: March 8, 1979
    Date of Patent: November 11, 1980
    Assignee: Hitachi, Ltd.
    Inventors: Shun-ichiro Sugimoto, Hisazi Shinoki
  • Patent number: 4228415
    Abstract: Disclosed herein is an inexpensive tubular electromagnetic solenoid which employs stamped and drawn parts with a minimum of machined parts. The tubular housing is deep drawn and has a relatively light gauge side wall and an integrally formed end wall with apertures for pin terminals. A stamped flux enhancing disc is anchored exteriorly of the end wall and is swaged to a projecting portion of a pole piece located interiorly of the end wall. The flux disc-pole piece assembly rigidifies the housing end wall and the pole piece supports and positions one end of the bobbin. Stamped washers having axial apertures interfit into the end of the tubular housing and receive and support the other end of the bobbin. The bobbin has integrally molded pin terminal support bosses which project through apertures in the end wall and position and support the terminations.
    Type: Grant
    Filed: July 26, 1978
    Date of Patent: October 14, 1980
    Inventor: Spencer C. Schantz
  • Patent number: 4218669
    Abstract: A solenoid comprising a housing having a passage extending through the housing, a coil in the housing, a pole piece in the passage of the housing, and an armature mounted in the passage for linear movement along a path toward and away from the pole piece. A nonmagnetic gap is provided between the coil and the pole piece and the armature and a spring urges the armature away from the pole piece. An elongated actuator member is mounted on the armature for movement with the armature. The spring force and the position of the actuator member along the path can be readily adjusted.
    Type: Grant
    Filed: September 13, 1978
    Date of Patent: August 19, 1980
    Assignee: SR Engineering
    Inventors: Melvin L. Hitchcock, Ralph D. Ray, Eugene H. Felder, Jr.
  • Patent number: 4217567
    Abstract: Low cost tubular solenoids are formed with a drawn case in which the pole portion forming the base of the solenoid is defined as an integral inwardly extending part of the case. A coil bobbin is formed by the injection molding of plastic material and is provided with an integral wall which is positioned in abutting relation to the inside surface of the pole portion, thereby forming a stop surface for the solenoid plunger and effectively spacing the plunger from the base. The plunger is guided on the internal surfaces of the bobbin and in one embodiment, a spun hollow sheet metal bushing is captured by the case in telescopic relation to the bobbin, and is formed with threads which receive thereon a sheet metal retaining nut. In another embodiment of the invention, a washer is threaded onto an axial extension portion of the bobbin, and the open end of the case is crimped onto an annular groove formed on the washer. In a further embodiment, the washer is injected molded in place on the bobbin.
    Type: Grant
    Filed: September 18, 1978
    Date of Patent: August 12, 1980
    Assignee: Ledex, Inc.
    Inventors: Kenneth L. Roy, William D. Sadgebury
  • Patent number: 4216454
    Abstract: The present invention is a plunger-type electro-magnetic actuator which produces a constant attracting force regardless of the position of the plunger. A tip portion of the plunger is tapered and a magnetic pole piece of the solenoid adapted to electro-magnetically attract the tip portion is provided with a tapered hole having a diameter larger than the outer diameter of the plunger. An additional magnetic pole piece is substantially displaced from the magnetic pole piece along the advancing direction of the plunger so as to increase the operational range of the plunger.
    Type: Grant
    Filed: August 2, 1978
    Date of Patent: August 5, 1980
    Assignee: Diesel Kiki Co., Ltd.
    Inventors: Yoshio Ohtani, Todomu Kakishima
  • Patent number: 4178573
    Abstract: An electrically operated valve having a mechanically actuated position for valving a fluid port between an open and closed position. A first tubular pole member contained within an electrical coil is movable between a first and second position with respect to a second, stationary, coaxially aligned tubular pole member. A reset spring urges the first pole member toward the first position. An armature, having a valve sealing surface at one end, is movable between first and second positions for alternately closing and opening a fluid port. The first pole member defines an air gap with respect to the second pole member which, during energization of the electrical coil, has associated therewith a magnetic flux with accompanying lines of magnetic force. One end of the armature is spaced closely adjacent to the air gap so that, upon energization of the coil, the magnetic force lifts the armature to the second position, overcoming a second biasing spring which normally maintains the armature in the first position.
    Type: Grant
    Filed: November 23, 1977
    Date of Patent: December 11, 1979
    Assignee: Eaton Corporation
    Inventor: Wesley S. Swanson
  • Patent number: 4166991
    Abstract: A solenoid operable from an alternating voltage source is disclosed and the solenoid may actuate a fluid valve with the fluid of the valve wetting the movable armature inside a barrel. The barrel is sealed against fluid leakage at all places except the axial end connected to the valve. A frame is coaxial with the barrel and encloses an electrical coil. A magnetically permeable core is inside the barrel and fixed relative to the frame and this core carries a first pole piece. A second pole piece is on the movable armature for cooperation with the first pole piece. The electrical coil is energized with rectified voltage from the alternating voltage source and this together with the shape of the pole pieces establishes a controlledsaturation of these pole pieces in a range of positions of the armature. This saturation of the pole pieces is established so that the saturation decreases as the armature moves from a first extended position toward a second closed position.
    Type: Grant
    Filed: October 19, 1977
    Date of Patent: September 4, 1979
    Assignee: Acme-Cleveland Development Company
    Inventor: Lambert Haner
  • Patent number: 4156220
    Abstract: An improved starter solenoid for an internal combustion engine has magnetic yoke, designed to eliminate gaps in magnetic flux, which supports two switch windings for pulling and holding a movable core acting on the starter gear and on the movable switch contact. The yoke, in the form of a rectangular frame without gaps, has two short sides, one of which supports a fixed core to support the two switch windings, while the other contains an opening, coaxial with the fixed core, to allow passage of the movable core. A sleeve is fitted with one end on the fixed core and the other end inside the opening, and serves as a bearing for the movable core.
    Type: Grant
    Filed: April 27, 1977
    Date of Patent: May 22, 1979
    Assignee: Societe de Paris et du Rhone
    Inventor: Alfred B. Mazzorana
  • Patent number: 4137513
    Abstract: A matrix print wire solenoid has a small diameter print wire which wire is propelled against printing paper and inking ribbon by the linear motion of the solenoid plunger, to which the print wire is attached, in an improved impact printer having a plurality of solenoids positioned in a row for use in dot matrix printing. The solenoid features a low cost construction, a reduction in size, and increased operating speed, and has pole pieces which are separated by an inner gap and which pieces are aligned with a coil bobbin which provides a guide surface for the armature plunger. The space between the plunger and a forward bushing or spacer is occupied by a coil spring which has one end seated over a portion of the armature and the other end seated against the face of the bushing. The coil bobbin defines an air gap between one pole piece and the armature.
    Type: Grant
    Filed: October 27, 1977
    Date of Patent: January 30, 1979
    Assignee: NCR Corporation
    Inventors: John W. Reece, Victor J. Italiano, Leslie L. Crump
  • Patent number: 4131866
    Abstract: A solenoid device includes a cylindrical armature movable within a core tube the tube and armature being formed from magnetisable material. The armature is smaller in diameter than the interior diameter of the tube and a pair of axially spaced recesses are defined between the tube and the armature, each recess accommodating a circumferentially extending cylindrical member. The members serve to locate the armature within the tube and as relative axial movement occurs the members roll about their circumferential axes. The dimensions of the various parts are such that the members are nipped slightly when the device is assembled.
    Type: Grant
    Filed: April 19, 1977
    Date of Patent: December 26, 1978
    Assignee: Expert Industrial Controls Limited
    Inventor: Alan C. Torr
  • Patent number: 4127835
    Abstract: An electromechanical force motor including an elongate magnetic casing which coaxially enhouses a magnetic armature. An annular electromagnetic coil surrounds the armature and is axially positioned between a pair of permanent magnets having axially directed poles. A magnetic pole is positioned at each end of the armature in a posture juxtaposed to but spaced from the ends of the armature to provide a magnetic flux gap between the armature and poles. A pushrod is connected to one end of the armature and projects outwardly from the casing to produce work upon excitation of the electromagnetic coil.
    Type: Grant
    Filed: July 6, 1977
    Date of Patent: November 28, 1978
    Assignee: Dynex/Rivett Inc.
    Inventor: Dale A. Knutson
  • Patent number: 4112402
    Abstract: A coil is wound on a hollow plastic bobbin and mounted in a U-shaped ferromagnetic frame, there being a pair of aligned bosses on opposite sides of the bobbin bore at one end thereof fitting into cooperating slots in the frame. A ferromagnetic core is axially movable within the hollow bobbin and is urged away from the bottom of the frame by a leaf spring. A compact plastic housing covers the bobbin, coil, and the upper portion of the frame, and electric terminals, mounted in pockets at the top of the bobbin, project through slots in the housing to the exterior. Portions of the bobbin are extruded into openings in the base of the terminals to hold them in place, and a pair of tabs on the bobbin interact with slots in the housing, and posts on the inside corners of the housing form abutments to prevent over-insertion of the tabs in the slots. A hook on the bottom of the frame is shaped to be engageable with an opening in external support elements of differing thickness to facilitate installation.
    Type: Grant
    Filed: October 28, 1976
    Date of Patent: September 5, 1978
    Inventor: Spencer C. Schantz
  • Patent number: 4109221
    Abstract: A solenoid valve having a core tube and a top plug in the outer end of the core tube, is provided with an integrally formed, closed top wall and fastening means for preventing movement of a solenoid coil. The fastening means is mounted to the top wall and projects outwardly axially therefrom. In the preferred embodiment, the fastening means has an outer wall formed in a screw thread. A nut with a complementary internal thread is screwed down on the thread of the fastening means to hold the solenoid coil in place.
    Type: Grant
    Filed: December 9, 1976
    Date of Patent: August 22, 1978
    Assignee: Emerson Electric Co.
    Inventor: Jude A. Pauli
  • Patent number: 4055823
    Abstract: An electromagnetic valve assembly of the type having a tube for guiding the plunger armature which tube also supports the surrounding coil unit. A U-shaped yoke surrounds the coil and a housing is provided. The tube, which is attached to a valve casing, has an annular recess at the opposite end for receiving the slotted ring of a ring and nut pair which uses the tube as an abutment for biasing the yoke and the housing towards the valve casing. A lock ring is between the slotted ring and the yoke which has a first lug in a slot of the slotted member and a second lug in a recess in the housing to prevent relative rotation between the slotted ring and the housing.
    Type: Grant
    Filed: May 17, 1976
    Date of Patent: October 25, 1977
    Assignee: Danfoss A/S
    Inventor: Erik Andersen
  • Patent number: 4054854
    Abstract: A valve operator comprises a pole piece formed from magnetizable material, a hollow intermediate member formed from non-magnetic material the intermediate member being secured to the pole piece in a fluid pressure proof manner and a further hollow member secured to the intermediate member again in a pressure proof manner. The hollow members contain an armature and the end of the further member is sealed to completely enclose the armature.
    Type: Grant
    Filed: April 1, 1975
    Date of Patent: October 18, 1977
    Assignee: Expert Industrial Controls Ltd.
    Inventor: John Thomas Marsden
  • Patent number: 4018155
    Abstract: A ballistic print hammer assembly which includes a pivotally mounted print hammer driven by an electromagnetic actuator, characterized by low cost and ease of manufacture, high velocity and short dwell time. A rigid pivot upon which the hammer is mounted is simply secured to one side of a frame member. One end of the hammer is disposed in a slot of the armature of the electromagnetic actuator. The stator of the actuator is arranged to be inserted (by means of screw threads) from the other side of the frame member through an aperture so that the armature fits within the actuator stator cavity. An impression control spring is further disposed in a central cavity of the armature to continually produce a biasing force on the hammer which in the free-flight condition of the hammer is a decelerating force.
    Type: Grant
    Filed: June 2, 1975
    Date of Patent: April 19, 1977
    Assignee: Mohawk Data Sciences Corporation
    Inventor: N. Allen Cargill
  • Patent number: 3932826
    Abstract: A dashpot solenoid is provided having a thin-walled well with a support ring around an accurately sized and shaped slightly reduced mouth portion and an adjustable air metering orifice at the bottom or opposite end. A plunger coated with a polyfluoro hydrocarbon is sized and shaped to fit within the well such that the clearance between the plunger and the mouth portion of the well provide a functionally airtight sliding fit. In operation the plunger is drawn into the well and air captured therein is permitted to escape through the adjustable metering orifice at a rate which damps the plunger motion.
    Type: Grant
    Filed: August 22, 1974
    Date of Patent: January 13, 1976
    Inventor: Reginald A. Read, Jr.