With A Shunt Path For Magnetic Flux Patents (Class 335/236)
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Patent number: 4642594Abstract: An actuating magnet is provided for a circuit interrupter. The magnet yoke is assembled from three solid segments of magnetic material to produce a U-shaped core. One or more coils are disposed on the core loop, and the center of the yoke is interrupted by a series of aligned holes.Type: GrantFiled: August 10, 1984Date of Patent: February 10, 1987Assignee: Siemens Energy & Automation, Inc.Inventor: Ralf R. Volkmar
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Patent number: 4538129Abstract: A magnetic flux-shifting or magnetic latch valve includes a first flux path including a first permanent magnet having a large coercive force so that its polarity cannot readily be altered. It further includes a second flux path including a second permanent magnet having a small coercive force so that its polarity can be altered. A valve according to this invention further includes a d-c source and a winding energized by said d-c source for altering the polarity of said second magnet.The fluid valve includes a valve element and a valve seat cooperating with the valve element. The valve has two limit positions, i.e. fully open and fully closed. In the fully closed position the pole surfaces of magnetic flux paths have the same magnetic polarity and hence do not attract each other permitting gravity, spring or hydrostatic means to form a gap therebetween.Type: GrantFiled: July 1, 1982Date of Patent: August 27, 1985Inventor: Richard T. Fisher
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Patent number: 4509715Abstract: A pressure control valve with an impact plate which serves as a regulator for a specific drop in pressure. The pressure control valve includes an armature disposed in an electromagnetic field established by an electromagnetic coil and a permanent magnetic field, with the armature being rotatably supported between two respective pole shoes located on each side of the armature. The pole shoes located on one side of the armature, in contrast to the pole shoes located on the other side, have an opposing magnetic polarity induced by the permanent magnet. The pole shoes which are not aligned opposite one another on armature 85, are approached by armature 85 with movement of the impact plate toward a valve seat, and causes an increase in the air gap planes facing the armature, as compared to the other two pole shoes, and thereby establishes a non-linear characteristic for the pressure control valve.Type: GrantFiled: September 28, 1982Date of Patent: April 9, 1985Assignee: Robert Bosch GmbHInventor: Hans Kubach
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Patent number: 4505007Abstract: A magnet clasp a stationary part and a movable part, the stationary part including a permanent magnet, ferromagnetic plates secured to the permanent magnet, a ferromagnetic pillar and a non-magnetic case and cover which encase and cover the permanent magnet and associated parts, while the movable part has a ferromagnetic plug adapted to received by a central hole of the stationary part. The magnetic attracting force acts between the permanent magnet and the ferromagnetic plug to firmly hold the stationary and movable parts only when the ferromagnetic plug is placed in the central hole of the stationary part, whereas, when the ferromagnetic plug is placed on other portions of the stationary part, no substantial magnetic attracting force is exerted.Type: GrantFiled: January 26, 1984Date of Patent: March 19, 1985Inventor: Yoshihiro Aoki
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Patent number: 4480361Abstract: A magnetic clasp which protects magnetic records from being adversely affected by the magnetic induction lines of a magnet characterized in that the lines of magnetic induction inherent to the magnet are conveyed by the ferromagnetic end surface rather than diverged to outside in order to maximize the attracting power of the magnet. The paths of the magnetic induction lines are formed at a center hole bored in the magnet. The invention may be used as a clasp or lock for bags, boxes, bands or chains and has wide application for suitcases, handbags and purses.Type: GrantFiled: December 2, 1982Date of Patent: November 6, 1984Inventor: Tamao Morita
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Patent number: 4458396Abstract: A magnet clasp comprising a stationary part and a movable part, the stationary part including a permanent magnet, ferromagnetic plates secured to the permanent magnet, a ferromagnetic pillar and a non-magnetic case and cover which encase and cover the permanent magnet and associated parts, while the movable part has a ferromagnetic plug adapted to received by a central hole of the stationary part. The magnetic attracting force acts between the permanent magnet and the ferromagnetic plug to firmly hold the stationary and movable parts only when the ferromagnetic plug is placed in the central hole of the stationary part, whereas, when the ferromagnetic plug is placed on other portions of the stationary part, no substantial magnetic attracting force is exerted.Type: GrantFiled: November 16, 1982Date of Patent: July 10, 1984Inventor: Yoshihiro Aoki
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Patent number: 4458395Abstract: A magnet clasp a stationary part and a movable part, the stationary part including a permanent magnet, ferromagnetic plates secured to the permanent magnet, a ferromagnetic pillar and a non-magnetic case and cover which encase and cover the permanent magnet and associated parts, while the movable part has a ferromagnetic plug adapted to received by a central hole of the stationary part. The magnetic attracting force acts between the permanent magnet and the ferromagnetic plug to firmly hold the stationary and movable parts only when the ferromagnetic plug is placed in the central hole of the stationary part, whereas, when the ferromagnetic plug is placed on other portions of the stationary part, no substantial magnetic attracting force is exerted.Type: GrantFiled: November 16, 1982Date of Patent: July 10, 1984Inventor: Yoshihiro Aoki
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Patent number: 4403765Abstract: A magnetic flux-shifting or magnetic latch valve includes a first flux path including a first permanent magnet having a large coercive force so that its polarity cannot readily be altered. It further includes a second flux path including a second permanent magnet having a small coercive force so that its polarity can be altered. A valve according to this invention further includes a d-c source and a winding energized by said d-c source for altering the polarity of said second magnet.The fluid valve includes a valve element and a valve seat cooperating with the valve element. The valve has two limit positions, i.e. fully open and fully closed. In the fully closed position the pole surfaces of magnetic flux paths have the same magnetic polarity and hence do not attract each other permitting gravity, spring or hydrostatic means to form a gap therebetween.Type: GrantFiled: May 18, 1981Date of Patent: September 13, 1983Assignee: John F. TaplinInventor: Richard T. Fisher
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Patent number: 4339853Abstract: A magnetic decoupler for use with an antitheft device is disclosed. In one preferred embodiment, the decoupler includes a composite permanent magnet comprising an annular permanent magnet that may be of ceramic and a second, preferably disc-shaped permanent magnet, which is preferably more strongly magnetized than the annular magnet and which preferably comprises a rare earth element. The two magnets are coaxially aligned with but axially displaced from each other and are oriented with the opposite polarity so as to create a region of especially great magnetic flux in the bore of the annular magnet. A cover plate, preferably of cold-rolled steel, may be provided adjacent the face of the annular magnet that is remote from the second magnet to further concentrate the flux in the bore.Type: GrantFiled: March 4, 1980Date of Patent: July 20, 1982Assignee: Permag CorporationInventor: Henry Lipschitz
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Patent number: 4288771Abstract: An electromagnetically driven device has a coil and a plunger movably inserted in the coil between an inserted and ejected positions. An armature carrying a permanent magnet is provided at one end of the coil for holding the plunger in the inserted position by a magnetic attractive force developed between the armature and the plunger when the coil is deenergized. A yoke is provided between the permanent magnet and the armature for establishing a magnetic circuit therebetween with a predetermined reluctance developed between the armature and the yoke.Type: GrantFiled: February 8, 1980Date of Patent: September 8, 1981Assignee: Minolta Camera Kabushiki KaishaInventors: Hiroshi Ueda, Shigeru Oyokota
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Patent number: 4244290Abstract: A miniature printer includes character rings, each having a series of characters on the outer periphery thereof and teeth on a side surface thereof for selection of a character to be printed. The shaft carrying the character rings also has mounted thereon a radially-slotted disc through the slots of which a light beam is passed for signalling the angular position of said shaft, the light beam being directed at light-detection means. Electronic circuitry controls pawls for selectively stopping the character rings so that a selected character on each ring is brought to rest at a printing position for printing. The electronic circuitry also controls the intermittent feed of printing paper and printing ribbon. A gear-selection mechanism provides for a plurality of printing-paper feed rates as well as for holding the paper stationary when required.A number of the components are of unitary contruction to increase the ease of assembly and decrease the costs as well as the number of parts.Type: GrantFiled: March 29, 1978Date of Patent: January 13, 1981Assignee: Kabushiki Kaisha Suwa SeikoshaInventors: Kazuto Tamai, Shigeru Sawada, Osamu Nakamura, Norio Nakagaki
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Patent number: 4238749Abstract: An electromagnetic circuit breaker is provided having a flux producing solenoid and a movable armature attractable to the solenoid upon the occurrence of a predetermined current level and duration. A flux path in the form of members of low reluctance are arranged so that the flux circuit comprises a plurality of loops, each loop having one or more variable reluctances which are dependent upon the position of the armature and a movable core located within the solenoid. Increased pulse resistance is obtained without substantially effecting the operation of the switch upon sustained overloads of a predetermined level and duration. The bobbin on which the solenoid coil is wound is provided with a groove with which a member of low reluctance is lockingly engaged. Other low reluctance members are configured to facilitate assembly of the circuit breaker.Type: GrantFiled: December 29, 1978Date of Patent: December 9, 1980Assignee: Texas Instruments IncorporatedInventors: Martin W. Lawson, David M. Brown
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Patent number: 4233583Abstract: A solenoid is disclosed in which a ferromagnetic shield substantially surrounds the circumferential surface of the coil in order to provide a high-permeability flux path on the coil exterior. The shield is formed by a ferromagnetic collar and the body part of a bracket. The ferromagnetic collar extends partially around the coil, and the body part of the bracket faces a longitudinal opening in the ferromagnetic collar. The ferromagnetic collar is embedded in a molded epoxy encapsulation, which is found to be reinforced by the collar. Alternatively, the shield can be formed exclusively of a ferromagnetic collar that extends substantially around the entire periphery of the coil.Type: GrantFiled: September 22, 1978Date of Patent: November 11, 1980Assignee: Bicron Electronics CompanyInventor: William G. Novacek
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Patent number: 4216454Abstract: 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: GrantFiled: August 2, 1978Date of Patent: August 5, 1980Assignee: Diesel Kiki Co., Ltd.Inventors: Yoshio Ohtani, Todomu Kakishima
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Patent number: 4173004Abstract: A magnetic latch for a clapper type contactor having an electromechanical system comprising an operating coil, a coil core, a magnet frame, and an armature includes a magnetic latch plate. The magnetic latch plate includes a stop portion having a pair of ears mounted on a pivoted contact arm. The stop portion of the latch abuts against the magnet frame before energization of the coil so that a flux path includes the core, the magnet frame, the magnetic latch, the armature and the air gap between the armature and core of the coil.Type: GrantFiled: July 25, 1978Date of Patent: October 30, 1979Assignee: Square D CompanyInventor: Frederick E. Woodlief
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Patent number: 4168756Abstract: A balancing scale or electromagnetically compensated weighing apparatus has an independently actuatable and temperature-sensitive magnetic device for balancing a load member; the magnetic device forms a magnetic circuit, and includes a temperature-sensitive corrective device affecting the circuit in at least two locations, so as to substantially temperature-compensate the magnetic circuit over a predetermined temperature range.Type: GrantFiled: December 19, 1977Date of Patent: September 25, 1979Assignee: August Sauter GmbHInventors: Erwin Enzmann, Manfred Kammerer, Johann Tikart, Walter Glaser
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Patent number: 4072918Abstract: An actuator having an armature plate urged to a stable position by a spring and which may be held in another stable position by a permanent magnet. Application of an appropriate current pulse to a coil within the actuator reduces the flux flow through and the magnetic force on the armature sufficiently to release the armature to the former stable position under the influence of the spring. Two magnetic circuits, one of which includes a non-working air gap, are employed, the non-working air gap serving to maintain a flux path, of a predetermined maximum reluctance, for the permanent magnet when the armature plate is in the former stable position.Type: GrantFiled: December 1, 1976Date of Patent: February 7, 1978Assignee: Regdon CorporationInventor: Reginald A. Read, Jr.
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Patent number: 4050043Abstract: A system for a relay is disclosed having a permanent magnet for bias and electromagnetic energization for changing the disposition of an armature. A magnetic shunt path is provided for the permanent magnet serving as a basic load on the magnet, in that the magnetic resistance of magnet plus parallel shunt is lower than the resistance of the remainder of the magnetic circuit. The shunt has preferably resistance that declines with field strength and the flux at the work point (external excitation zero) plus field as set up by the magnet times its permeability should exceed 6000 Gauss.Type: GrantFiled: December 26, 1974Date of Patent: September 20, 1977Assignee: Elmeg Elektro-Mechanik GmbHInventors: Hans-Werner Reuting, Hugo Eggers
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Patent number: 4015174Abstract: A magnetic device comprising two permanent magnets, armature members forming with said magnets a closed magnetic circuit and an external air gap, and means for reversing the direction of magnetization of one of the magnets, whereby the flux is prevented to close along the magnetic circuit and caused to close through the air gap, or caused to close along the magnetic circuit, the flux in the air gap then being suppressed. The said means consist of two distinct coils wound about the magnets. One of the coils is energized for establishing the flux in the air gap, while the other coil is energized for suppressing the flux in the air gap.Type: GrantFiled: July 30, 1975Date of Patent: March 29, 1977Assignee: Le Materiel MagnetiqueInventor: Michel Cotton de Bennetot
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Patent number: 3985983Abstract: A tension control system employing a shunt-positioning slide provided with a longitudinal slot engaged by a pin carried by a tension-responsive actuating slide member only when predetermined upper and lower tension thresholds are exceeded to insert and withdraw a shunt member from a position between a magnet and a reed switch which deactivates and activates a rewind motor while preventing undesirable recycling of the reed switch and rewind motor.Type: GrantFiled: January 17, 1975Date of Patent: October 12, 1976Assignee: Burroughs CorporationInventor: Hilliard R. Di Veto