Delayed Action (i.e., Time Lag) Patents (Class 337/163)
  • Patent number: 10347402
    Abstract: A thermal fuse resistor including a ceramic substrate, a resistor body, a temperature sensing body, a first electrode cap, a second electrode cap, a first lead wire, a second lead wire, and a third lead wire. A first end of the ceramic substrate is provided with a first electrode cap, and a second end of the ceramic substrate is provided with a second electrode cap. The first electrode cap includes a main body, an inner end, and an outer end with an opening. The outer end includes an everted edge closely contacting the first end of the ceramic substrate. The main body and the inner end are arranged inside the ceramic substrate. The first lead wire extends outward from an outer end. One end of the third lead wire is electrically connected to the second electrode cap.
    Type: Grant
    Filed: May 23, 2018
    Date of Patent: July 9, 2019
    Assignee: XIAMEN SET ELECTRONICS CO., LTD.
    Inventors: Shunyuan Du, Lyubo Lin, Yousheng Xu, Changzhou Zhang
  • Patent number: 10283296
    Abstract: A controllable circuit protector for power supplies with different voltages includes a first fuse and a second fuse connected in series to each other, a first heating unit, and at least one second heating unit in parallel to the first heating unit. A connected end of the first heating unit is electrically connected to a series-connected node between the first fuse and the second fuse, and a free end thereof forms a control terminal. When a load is irregular, the control terminal is connected to a ground terminal through a switch. For power supplies with different voltages, the effective resistance of the first heating unit and a part of the at least one second heating unit not melting is altered without causing drastic change arising from voltage variation to the total heating power, and the first fuse or the second fuse can duly melt down to protect the load.
    Type: Grant
    Filed: October 5, 2016
    Date of Patent: May 7, 2019
    Inventor: Chin-Chi Yang
  • Patent number: 9831055
    Abstract: An improved surface mount electrical fuse including a first fuse terminal; a second fuse terminal spaced apart from the first fuse terminal; and a fuse element formed from a conductive material, the fuse element having a support bridge for supporting the fuse element, the fuse element electrically connecting the first fuse terminal and the second fuse terminal.
    Type: Grant
    Filed: October 15, 2014
    Date of Patent: November 28, 2017
    Assignee: Littelfuse, Inc.
    Inventors: James J. Beckert, Gregory G. Stumpo, Andrew J. Saarnio
  • Patent number: 9184012
    Abstract: A fuse formed as part of an integrated circuit has cavities disposed to the sides of the fuse to provide more reliable operation with less chance of re-connection. A method of providing the fuse is also described.
    Type: Grant
    Filed: December 19, 2012
    Date of Patent: November 10, 2015
    Assignee: Allegro Microsystems, LLC
    Inventor: Yigong Wang
  • Patent number: 8686825
    Abstract: Embodiments of the invention are related to oxidative opening switches and related methods, amongst other things. In an embodiment, the invention includes a switch assembly including a first terminal, a second terminal, and an oxidative switch element in electrical communication with the first terminal and the second terminal, the switch element comprising a conductive material and an oxidizer, the switch element configured to interrupt electrical communication between the first terminal and the second terminal as a result of an oxidation reaction between the conductive material and the oxidizer. In an embodiment, the invention includes a fast opening switch for pulse power applications. Other aspects and embodiments are provided herein.
    Type: Grant
    Filed: July 8, 2011
    Date of Patent: April 1, 2014
    Assignee: JPA, Inc.
    Inventors: Richard F. Johnson, Randy Berg, Stanley E. Wood
  • Patent number: 7994892
    Abstract: Embodiments of the invention are related to oxidative opening switches and related methods, amongst other things. In an embodiment, the invention includes a switch assembly including a first terminal, a second terminal, and an oxidative switch element in electrical communication with the first terminal and the second terminal, the switch element comprising a conductive material and an oxidizer, the switch element configured to interrupt electrical communication between the first terminal and the second terminal as a result of an oxidation reaction between the conductive material and the oxidizer. In an embodiment, the invention includes a fast opening switch for pulse power applications. Other aspects and embodiments are provided herein.
    Type: Grant
    Filed: June 20, 2008
    Date of Patent: August 9, 2011
    Inventors: Richard F. Johnson, Randy Berg, Stanley E. Wood
  • Publication number: 20100315192
    Abstract: A fusible link includes a fuse portion that has a first resistance portion and a second resistant portion which are formed of a fusible metal conductor. The first resistance portion has a fusible portion which is provided in proximity to a connecting portion of the first resistance portion with the second resistance portion and is adapted to be fused to be broken when the fusible portion is heated up by an overcurrent. The fusible link further includes a metal chip whose melting point is lower than a melting point of the fusible metal conductor, and which is adapted to be fused to be dispersed into the fusible portion for formation of an alloy phase when the metal chip is heated up by the overcurrent and a holding portion that is provided in proximity to the fusible portion for holding the metal chip.
    Type: Application
    Filed: June 8, 2010
    Publication date: December 16, 2010
    Inventor: Shinya ONODA
  • Publication number: 20090066470
    Abstract: A fuse element comprises a pair of female terminal portions into which the other pair of terminals are plugged and which are disposed in parallel and a blowout portion for coupling the pair of female terminal portions in a direction perpendicular to the direction in which the other pair of terminals are plugged. A slow blow fuse comprising the fuse element houses the fuse element in an insulating-resin housing and is provided with an insertion port in which the other pair of terminals are plugged into the pair of female terminal portions in the opposed surface of the housing.
    Type: Application
    Filed: November 23, 2006
    Publication date: March 12, 2009
    Applicant: Sumitomo Wiring Systems, Ltd.
    Inventor: Takashi Miyamoto
  • Publication number: 20080100411
    Abstract: The present invention relates to a power control system with a fusible link. In one embodiment, the invention relates to a power control system, having a device possessing an output, a fusible link connected to the output of the device, a heating element controller, and at least one heating element connected to the heating element controller, where the heating element controller is configured to control the flow of current through the heating element, where the heating element controller is configured to monitor activity of the device, and where the heating element is configured to generate sufficient heat to fuse the fusible link within a predetermined time period when current flows through the heating element.
    Type: Application
    Filed: October 31, 2006
    Publication date: May 1, 2008
    Inventors: Farshid Tofigh, Otmar Kruppa, Jesse Thomas Chen
  • Patent number: 6590490
    Abstract: In an exemplary embodiment of the invention, a fuse element for a time delay fuse includes a conductive fuse element member, a fuse link formed within the member, and a heat sink coupled to the member. The heat sink draws heat from the fuse element member and prevents the fuse link from opening for an increased amount of time during high current overload conditions.
    Type: Grant
    Filed: May 18, 2001
    Date of Patent: July 8, 2003
    Assignee: Cooper Technologies Company
    Inventor: John Marvin Ackermann
  • Publication number: 20020113684
    Abstract: A miniature fuse of surface mount type having a stable pre-arcing time-current characteristic and a strong time lag characteristic, being easy to produce, and providing a constant pre-arcing time is provided. The main body is of rectangular ceramic construction of split type. A fusible member 60 (Ag:Cu:An=>50%:>20%>17%:>5% (weight ratio) wound around the ceramic rod 58 (A12O3:MgO:BeO=>96%:>3%:>3%:<1% (weight ratio) is rested on the recessed portion 62 of the lower ceramic casing 54. The end portion 76 of the fusible member 60 is engaged with the side surface of the casing. The upper ceramic casing 52 is laid on the lower casing, so that the cap 56 is fit onto the opposite ends of the main body. The end portion 76 of the fusible member 60 and the cap 56 are connected by welding. At the time of welding, projection 74 to be fit in the recessed portion 72 provided at the main body is formed at the cap 56, so that the cap 56 can be fixed to the main body.
    Type: Application
    Filed: February 11, 2002
    Publication date: August 22, 2002
    Inventors: Hiroo Arikawa, Koh Ishimura, Seiji Norisue
  • Patent number: 6380837
    Abstract: A fuse assembly is provided having two fusible elements, electrically in parallel with each other, thereby providing the fuse assembly with increased inrush current withstand capacity, a greater range of current ratings and lower temperature rise at higher rated currents.
    Type: Grant
    Filed: June 20, 2000
    Date of Patent: April 30, 2002
    Assignee: San-O-Industrial Corporation
    Inventor: Carl E. Lindquist
  • Patent number: 5927060
    Abstract: A composite longitudinally balanced electrically conductive yarn has a textile fiber core yarn wrapped with a minimum of two, and a maximum four, filaments. One to four of the filaments are metal filaments with the remainder being synthetic filaments. Each metal filament has an equivalent diameter of between 20 and 80 microns, and a wrap frequency of between 200 and 600 turns per meter. At least one of the metal filaments is wrapped in one direction, and at least one of the remaining filaments is wrapped in the opposite direction. The composite yarns of this invention is capable of elongation to accommodate tensile stresses under use, without experiencing a change in conductivity.
    Type: Grant
    Filed: October 20, 1997
    Date of Patent: July 27, 1999
    Assignee: N.V. Bekaert S.A.
    Inventor: Douglas L. Watson
  • Patent number: 5898358
    Abstract: Fuse comprising ceramic oxide fibers and vermiculite particulate.
    Type: Grant
    Filed: July 25, 1997
    Date of Patent: April 27, 1999
    Assignee: Minnesota Mining & Manufacturing
    Inventors: Thomas L. Tompkins, Margaret M. Vogel-Martin
  • Patent number: 5629569
    Abstract: A self-configuring photoelectric control circuit for controlling operation of a load based on ambient light. The photocontrol circuit comprises a photocell responsive to ambient light, a heating resistor connected to the photocell, a bimetallic element in proximity to the heating resistor and movable in response to generation of heat from the heating resistor. A switch is operated by the bimetallic element and is connected between an input connected to a power source and an output connected to the load. A series resistor is connected to the heating resistor and a shunt is connected across the series resistor to provide a current bypass around the series resistor for operation with a low voltage power source, for instance 120 volts. The shunt is maintained in a flexed condition to form the bypass and a connection of the shunt across the series resistor is formed of a meltable material.
    Type: Grant
    Filed: May 15, 1995
    Date of Patent: May 13, 1997
    Assignee: Intermatic, Inc.
    Inventor: Rudy Janda
  • Patent number: 5546066
    Abstract: The present invention provides a delayed-fusion fuse by which its predetermined durability can be reliably ensured, and its stable pre-arcing time-current characteristics can be obtained, even when a current exceeding the steady-state current such as a motor lock current frequently flows in the fuse. The delayed-fusion fuse includes a pair of electric connecting sections formed on both sides of a fusible section having a narrow fusing portion made of an electrically conductive metal. Also, the delayed-fusion fuse includes a metallic chip made of low fusing point metal for absorbing heat generated in the fusible section, and a covering and adhering section for holding the metallic chip on the fusible section. A thin metallic layer forms a solid solution with the low fusing point metal, where the solid solution requires an energy of formation which is higher than that of the formation of a solid solution made of the electrically conductive metal and the low fusing point metal.
    Type: Grant
    Filed: August 25, 1994
    Date of Patent: August 13, 1996
    Assignee: Yazaki Corporation
    Inventors: Hiroki Kondo, Mitsuhiko Totsuka, Toshiharu Kudo, Hisashi Hanazaki
  • Patent number: 5528213
    Abstract: An embracing portion is formed on a fusible body of metal, and a chip of low-melting metal is embraced by this embracing portion, and a constricted portion of a small cross-sectional area is formed at the fusible body, and a radiating plate is provided in the vicinity of the constricted portion.
    Type: Grant
    Filed: June 22, 1994
    Date of Patent: June 18, 1996
    Assignee: Yazaki Corporation
    Inventors: Hiroki Kondo, Shigemitsu Inaba, Mitsuhiko Totsuka, Toshiharu Kudo
  • Patent number: 5406244
    Abstract: A time delay fuse that includes a trigger mechanism and fusible element within a cylindrical fuse casing that is closed by end ferrules. The trigger mechanism includes a plunger, a spring, and a cylindrical shell that contains the spring and plunger in a loaded condition. The shell has an end that wraps around an end of the fuse casing and is frictionally contacted by the end ferrule thereover.
    Type: Grant
    Filed: January 25, 1994
    Date of Patent: April 11, 1995
    Assignee: Gould Electronics Inc.
    Inventors: Clifford J. Thwaites, Ladislav L. Baraz, Mikhail Manoim
  • Patent number: 5361058
    Abstract: A time delay fuse including a fuse casing, terminals located on the exterior of the casing, a hollow electrically insulated inner core having first and second holes in the walls thereof, a fusible element that makes electrical connection to the terminals and is disposed on the surface of the core such that the length of the element is greater than the distance between the terminals, the element passing through the holes, and a material that is deposited on a portion of the element passing through the interior of the core and lowers the melting temperature of that portion.
    Type: Grant
    Filed: November 2, 1993
    Date of Patent: November 1, 1994
    Assignee: Gould Electronics Inc.
    Inventors: Jerry L. Mosesian, Clyde D. Reid
  • Patent number: 5345210
    Abstract: A time delay fuse and various subassembly components for that time delay fuse. The fuse includes a housing made of an insulating material. The housing encloses a short-circuit fusible element, preferably a copper or copper alloy strip having a plurality of slots. The housing also encloses one or more rigid meltable fusible elements, preferably a plurality of solder bars. A body of resilient, compressible insulating material has at least one passageway through which each of the time delay fusible elements extends. When the rigid meltable fusible elements melt, the circuit through the fuse opens. In addition, the passageway which surrounded the rigid meltable fusible elements collapses upon its melting. This provides protection against "arc-back.
    Type: Grant
    Filed: July 19, 1993
    Date of Patent: September 6, 1994
    Assignee: Littelfuse, Inc.
    Inventors: Robert G. Swensen, Joseph W. Kowalik
  • Patent number: 5343185
    Abstract: A fuse including a tubular casing, first and second blade-shaped terminals extending from respective sides of the casing, a short circuit fusible element attached to the first terminal, a heater attached to the second terminal, and a time delay overcurrent trigger mechanism electrically connecting the fusible element and the heater to each other in series in an electrical path between the blade-shaped terminals, the mechanism being connected to receive heat from the heater and to mechanically interrupt the electrical path when the heater heats up under low overcurrent conditions.
    Type: Grant
    Filed: July 19, 1993
    Date of Patent: August 30, 1994
    Assignee: Gould Electronics Inc.
    Inventors: Jerry L. Mosesian, Clyde D. Reid
  • Patent number: 5298877
    Abstract: We provide an overload fuse link that is generally used in cartridge type fuses along with a short-circuit fuse link. The overload fuse link is prepared from a solder alloy and is directly attached to the interior of one of the cartridge fuse terminals. The overload fuse link has an open bore opening at one end and a connector extending from the other end. The cartridge fuse which uses the fuse link also has an insulator through which the connector passes and the insulator separates the short circuit fuse link from the body section of the overload fuse link wherein when there is an overload, the fuse link connector electrically separates from the fuse link body section.
    Type: Grant
    Filed: February 19, 1993
    Date of Patent: March 29, 1994
    Assignee: Cooper Industries, Inc.
    Inventors: Leon Gurevich, Edward Haworth
  • Patent number: 5252942
    Abstract: A hollow electrical circuit protector preferably coated with an insulative coating which will maintain its structure and not be conductive when said circuit protector blows. The electrical circuit protector has at least one weak spot cross-sectional area and is generally adapted to be part of a dual element fuse link with ribbon-like fuse links on opposite sides thereof. Also provided are the ribbon like fuse links, one with a guide and the other with an integral washer.
    Type: Grant
    Filed: January 8, 1992
    Date of Patent: October 12, 1993
    Assignee: Cooper Industries, Inc.
    Inventor: Leon Gurevich
  • Patent number: 5235306
    Abstract: The improved fuse assembly includes a trigger assembly having an electrically nonconductive barrel for receiving a spring loaded trigger therein and a heater strip disposed along the outer circumferential surface of the barrel with a pair of end flaps. One end flap has a hole therethrough which fits over the end of the trigger adjacent the short circuit element. A second flap fits over the end of the barrel adjacent the end ferrule. The short circuit element, which is electrically and mechanically linked to a ferrule on the opposite end of the tube from the trigger assembly, engages the trigger and heater element in a solder fusing alloy.
    Type: Grant
    Filed: July 15, 1992
    Date of Patent: August 10, 1993
    Assignee: Cooper Industries, Inc.
    Inventors: Varinder K. Kalra, Vernon R. Spaunhorst, Keith A. Spalding
  • Patent number: 5198791
    Abstract: The surge absorber having a surge absorbing element, and first and second wire means for electrically connecting the surge absorbing element across the input lines of an electronic device. The first and second wire means are connected to the surge absorber by conductive heat releasable means, for example, a low melting point solder. The second wire means includes a spring loaded member such that, on release of the first or second wire means by the first or second heat releasable means, respectively, by melting of the solder due to heat generated by the surge absorbing element, the surge absorbing element moves away from the first or second wire means. The surge absorber prevents an abnormal heating of the surge absorbing element when continuous overvoltages or overcurrents pass therethrough.
    Type: Grant
    Filed: February 3, 1992
    Date of Patent: March 30, 1993
    Assignee: Mitsubishi Materials Corporation
    Inventors: Takashi Shibayama, Kazuyuki Arai, Fujio Ikeda
  • Patent number: 5187463
    Abstract: A time delay fuse including a fusible element for short circuit protection and a spring-loaded plunger partially contained in an enclosure and restrained by a solder mass for time-delayed overcurrent protection, the fusible element including a segment extending along the side of the enclosure in the space between the enclosure and the fuse casing.
    Type: Grant
    Filed: February 11, 1992
    Date of Patent: February 16, 1993
    Assignee: Gould, Inc.
    Inventors: Gary W. Di Troia, Paul M. Romani
  • Patent number: 5150093
    Abstract: A time-delay fuse having a fuse element with a series of weak spots surrounded by a loose sand filler. The fuse element is connected to a trigger mechanism by solder or other meltable alloy. The trigger section provides overload protection and the fuse element provides short circuit protection resulting in a time-delay fuse which can be used in places where there are size restrictions.
    Type: Grant
    Filed: June 7, 1991
    Date of Patent: September 22, 1992
    Assignee: Cooper Industries, Inc.
    Inventor: Leon Gurevich
  • Patent number: 5142262
    Abstract: A slow blowing fuse includes an open-ended rigid housing defining a fuse element-containing space therein. Conductive end caps close off the ends of the housing and act as electric terminals for the fuse. A spiral wound fuse element in said space extends between the end caps. The spiral wound fuse element comprises a core of flexible material around which is spirally wound a fuse filament which is electrically connected to the end caps. The spiral wound fuse element is sandwiched between the end caps to provide a configuration where at least the central portion thereof is located adjacent to the housing walls.
    Type: Grant
    Filed: June 24, 1991
    Date of Patent: August 25, 1992
    Assignee: Littelfuse, Inc.
    Inventor: Daniel Onken
  • Patent number: 5043689
    Abstract: A time delay fuse including a fuse casing, a preassembly including a wall member, a pin passing through a hole through the wall member, solder on one side of the wall member restraining the pin from movement through the hole and electrically connecting a fusible element thereto, a spring engaging the pin and on the other side of the wall member and biasing the spring in a direction away from the solder, and a wire that is electrically connected to the pin, a terminal at an end of the casing making electrical connection to the fusible element, and a terminal at the other end of the casing making electrical connection to the wire.
    Type: Grant
    Filed: October 3, 1990
    Date of Patent: August 27, 1991
    Assignee: Gould Inc.
    Inventors: Gary W. Di Troia, Paul M. Romani
  • Patent number: 4994779
    Abstract: A time-delay fuse 10 having a circular fusible element 22 with stress relief section 24. The cylindrical fuse element 22 is connected to a trigger mechanism 30 by solder or other meltable alloy. The trigger section 30 provides overload protection and the circular fusible element provides short circuit protection resulting in a time-delay fuse which can be used in places where there are size restrictions.
    Type: Grant
    Filed: August 21, 1989
    Date of Patent: February 19, 1991
    Assignee: Cooper Industries, Inc.
    Inventor: Robert S. Douglass
  • Patent number: 4972169
    Abstract: A spiral wound sand fuse has a non-reactive fiber core permitting use of the fuse to interrupt high fault currents in high voltage circuits.
    Type: Grant
    Filed: July 24, 1989
    Date of Patent: November 20, 1990
    Assignee: Cooper Industries, Inc.
    Inventor: Varinder K. Kalra
  • Patent number: 4771259
    Abstract: A connecting apparatus for connecting one end of a spring of a time-delay fuse to a hollow body of the fuse and a method for its manufacture is disclosed. The apparatus includes two transverse slots formed in the end of the body. An insert is placed in the slots. A central portion of the insert is disposed in the interior of the hollow body. An opening, such as one or more slots, is provided in the central portion of the insert for attaching one end of a spring to the insert and the body of the fuse. The other end of the spring is adapted to connect to a fusible element of the time-delay fuse. The method of manufacture of the apparatus includes forming transverse slots in the end of a hollow tube, placing the insert in the slots, and attaching one end of the spring to an opening in the insert. An alternative method of manufacture includes molding the hollow tube with an integral transverse member across the end of the tube, the transverse member having an opening in it.
    Type: Grant
    Filed: July 28, 1987
    Date of Patent: September 13, 1988
    Assignee: Cooper Industries, Inc.
    Inventors: Aldino J. Gaia, Donald E. Johnston
  • Patent number: 4736180
    Abstract: A core assembly having a flexible insulating material core and a spirally wound inner fuse wire engages with one or more elongate bodies of the flexible insulating material to sandwich and compress the inner fuse wire therebetween. An arc burning between the blown ends of the inner fuse wire will be blocked and quenched by the core and body insulating materials expanding or moving into the space where the arc subsists and is burning away a portion of the inner fuse wire. An outer fuse wire, an outer wrapper of shrinkable tubing or twisting together the core assembly and the elongated body or bodies retains the core assembly and insulating body or bodies engaged along their length and forms a fuse wire assembly.
    Type: Grant
    Filed: July 1, 1987
    Date of Patent: April 5, 1988
    Assignee: Littelfuse, Inc.
    Inventor: Seibang Oh
  • Patent number: 4727347
    Abstract: The present invention relates generally to a three chamber ferrule type fuse comprising a tube of dielectric material having a tube wall and a bore, providing a unitary sub-assembly comprising a plunger and plunger guide, and two short circuit elements, a coil spring and a ring, having the tube wall staked forming a support for the ring inserting the sub-assembly into said bore of the tube so that one end thereof rests on said ring, having the coil spring under compression, and staking the sub-assembly in place. The construction facilitates assembly by automatic machinery.
    Type: Grant
    Filed: December 15, 1986
    Date of Patent: February 23, 1988
    Assignee: Reliance Fuse, Brush Fuses Inc.
    Inventors: Dominic Cambio, Michael E. Ross, Richard Sperry
  • Patent number: 4703300
    Abstract: A composite time lag fuse having an insulating housing enclosing a time delay fuse and an electrical resistance heater which is located in intimate heat transfer relationship with the time delay fuse. The time delay fuse and electrical resistance heater being connected in a series circuit between a pair of conductive end caps closing the ends of the insulating housing. An overload current flow in the electrical resistance heater resulting in the generation and transfer of heat from the electrical resistance heater to the time delay fuse to cause the time delay fuse to interrupt after a predetermined time delay, an overload current flow in the circuit to be interrupted, which is of a lesser magnitude than would otherwise be interrupted by the time delay fuse. For improved short circuit performance, a short circuit fuse is also enclosed in the insulating housing and is connected in the series circuit.
    Type: Grant
    Filed: January 7, 1987
    Date of Patent: October 27, 1987
    Assignee: Cooper Industries, Inc.
    Inventor: Aldino J. Gaia
  • Patent number: 4692733
    Abstract: A fuse for an alternating current power circuit in the medium voltage (3.3 kV to 38 kV) range. The fuse comprises a sealed chamber and a first electrode (41) is mounted within the chamber, the first electrode having a substantially circular periphery (42) and being electrically connected to a first terminal (3) to which a first conductor may be connected. A second electrode (35) is arranged with a conductive surface internally of the chamber, the conductive surface being spaced from the first electrode. A coil (10) is connected in an electrical path between the second electrode (35) and a second terminal (18) to which a second conductor may be connected. An additional electrical contact (44) is mounted within the chamber and in direct electrical connection with the second terminal, and a fusible element (43) directly electrically connects the first electrode (41) and the additional electrical contact (44). An electronegative halogenated medium fills free space within the chamber.
    Type: Grant
    Filed: July 17, 1986
    Date of Patent: September 8, 1987
    Assignee: Y. S. Securities Limited
    Inventor: Martin C. Oakes
  • Patent number: 4651119
    Abstract: An electric fuse is provided with heat dam elements interconnecting the fusible element and the fuse end terminals, which are provided with one or more raised ribs integrally formed therein. The heat dams include a plurality of planar sections and interconnecting bends to which the ribs impart a high degree of stiffness and dimensional stability.
    Type: Grant
    Filed: June 28, 1985
    Date of Patent: March 17, 1987
    Assignee: Gould Inc.
    Inventors: Richard A. Belcher, Robert J. Panaro
  • Patent number: 4646052
    Abstract: A slow blow fuse has a fuse element section and a pair of electrical terminals integrally formed with the opposite ends of the fuse element section. The fuse element section and the electrical terminals are formed of a high melting point metal and heat accumulators formed of aluminum are secured to the opposite ends of the fuse element section in heat transfer relationship therewith.
    Type: Grant
    Filed: December 24, 1985
    Date of Patent: February 24, 1987
    Assignee: Sumitomo Wiring System, Ltd.
    Inventors: Katsumi Matsunaga, Yoshitsugu Tsuji
  • Patent number: 4635023
    Abstract: A fuse assembly has a fuse link extending suspended in a housing between a pair of terminal extensions, which the fuse link interconnects electrically. A fuse blowing current-reducing material like tin is carried on the fuse link and spaced from and on opposite sides of the hot spot of the fuse link where the fuse is expected to blow.
    Type: Grant
    Filed: May 22, 1985
    Date of Patent: January 6, 1987
    Assignee: Littelfuse, Inc.
    Inventor: Seibang Oh
  • Patent number: 4611192
    Abstract: A heavy-duty, time-delay fuse includes a pair of heat sinks having mutually facing, generally planar contact surfaces normally eutectically soldered to each other. A spring between the heat sinks is operative for urging the contact surfaces apart from each other in a direction generally perpendicular to the planes in which the contact surfaces lie in the event of an overload condition in which an overload electrical current causes a pair of fusible links to generate sufficient heat to melt the eutectically soldered interconnection between the contact surfaces after a predetermined time delay proportional to the amount of heat absorbed and dissipated by the heat sinks.
    Type: Grant
    Filed: January 25, 1985
    Date of Patent: September 9, 1986
    Assignee: Eagle Electric Mfg. Co., Inc.
    Inventor: Guru B. Arora
  • Patent number: 4593262
    Abstract: A fuse (12) for protecting a circuit and comprising a tube (14) of insulating material having an inner wall surface (16) and an outer wall surface (18) so as to form a fuse housing. The fuse includes two opposite axial ends (20) and (22), and a first (24) and a second conductive fuse terminal (26) are secured to the tube adjacent each of those opposite axial ends, respectively. Serially-located elements (28) are disposed within the fuse housing and provide electrical continuity between the first fuse terminal and the second fuse terminal. The elements comprise stressed spring means (30) and resistor means (32), with the spring means having a proximate end (40) secured to the fuse adjacent the first fuse terminal and a distal end (41) secured through a meltable junction (34) to the resistor means.
    Type: Grant
    Filed: March 22, 1985
    Date of Patent: June 3, 1986
    Assignee: Littelfuse, Inc.
    Inventor: David J. Krueger
  • Patent number: 4559513
    Abstract: A generally U-shaped connector is included in a current limiting fuse having first and second interior conductor members. The connector is disposed between the first and second conductor members, and completes an electrical circuit therebetween. The first conductor member has a free end which is received between the legs of the U-shaped connector and is secured thereto by a first mass of heat softenable alloy. The second conductor member underlies a leg of the connector, and is secured thereto by a second mass of heat softenable alloy. A hook-like projection struck out of the bight of the U-shaped connector receives a loop end of a spring which biases the connector for circuit-opening movement away from the first conductor member. Upon conducting a small protracted overcurrent, the conductor members and connector are heated to soften the alloy masses, allowing circuit-opening movement of the spring biased connector away from the first conductor member.
    Type: Grant
    Filed: September 10, 1984
    Date of Patent: December 17, 1985
    Assignee: Cooper Industries, Inc.
    Inventor: Aldino J. Gaia
  • Patent number: 4533895
    Abstract: A slow-blow electrical fuse structure features one or more conducting fuse links for high-current blow-out protection and located in individual chambers filled with arc-quenching filler and in thermal contact with a spring-loaded piston-and-guide structure soldered into an extended position and similarly soldered to one of the fuse links by an extension leading through a chamber-separating insulating partition washer. At overload the heat from the fuse links melts the aforementioned soldered junctions, causing the spring to collapse the piston over the guide, simultaneously withdrawing it from the chamber, thereby breaking the circuit. A similar chamber-defining washer is captively affixed to the opposite end of the piston-and-guide assembly affixed to the optional second fuse link, both partition-forming washers being rotatingly captively secured to the ends of the piston-and-guide assembly by specially configured apertures therein.
    Type: Grant
    Filed: June 22, 1984
    Date of Patent: August 6, 1985
    Assignee: Littelfuse, Inc.
    Inventors: Joseph W. Kowalik, David J. Krueger
  • Patent number: 4445106
    Abstract: A spiral wound fuse body comprises a core of insulating material formed by a limp, dead yarn made of twisted together initially sizing-coated strands of fine ceramic filaments, where the sizing was subsequently removed so that there is no sizing to leave a conductive residue under fuse blowing conditions. Such a fuse body is mass produced by spiral winding fuse wire upon a continuous length of said yarn unwinding from a spool upon which the yarn was wound when the sizing was removed. The resulting self-supporting body can be wound into rolls and subsequently unwound so that individual fuse bodies can be severed from the end of the unwinding roll of fuse body-forming material.
    Type: Grant
    Filed: October 7, 1980
    Date of Patent: April 24, 1984
    Assignee: Littelfuse, Inc.
    Inventor: Nitin Shah
  • Patent number: 4414526
    Abstract: An electric low-voltage current-limiting fuse completely or substantially complying with the Underwriters Laboratories Inc. Standard Class R fuses. The current carrying part of the fuse comprises a fusible element having serially arranged perforations. This part may be of silver or of copper. The current carrying part of the fuses further comprises tabs of copper bent over the rims of the casing and conductively interconnecting the ends of the fusible element with the terminal caps of the fuse. The fusible element is provided with an M-effect metal to limit the temperature rise of the fusible element and of the casing. The tabs are considerably thicker than the fusible element. If the fusible element is of silver the thickness of the tabs of copper is larger than the thickness required to fully compensate for their higher resistivity.
    Type: Grant
    Filed: November 16, 1981
    Date of Patent: November 8, 1983
    Assignee: Gould Inc.
    Inventor: Robert J. Panaro
  • Patent number: 4369421
    Abstract: A delayed safety device in which a meltable conductor engages two contacts. The meltable conductor is shielded by a non-conductive sleeve which serves also as touch protection. The meltable conductor is of a base metal having a coating of synthetic plastic which decomposes when heated and emits hydrochloric acid. The acid reacts with the conductor and reduces its cross-section. The coating protects the conductor against corrosion, and provides the conductor with switching-off characteristics present when the conductor is made of a noble metal.
    Type: Grant
    Filed: July 16, 1981
    Date of Patent: January 18, 1983
    Inventor: Christian Felsch
  • Patent number: 4321574
    Abstract: A dual element, time delay fuse with greater blowing time accuracy and improved operating characteristics wherein any bridging of the circuit opening air gaps by molten alloy is effectively precluded during operation of the fuse, especially operation initiated by small protracted overloads. This is accomplished with a fuse element assembly comprising a series connection of a short circuit member, a central absorber member and a heater element member, the central absorber member held to the short circuit member and heater element member by masses of fusing alloy on each of its ends, which masses of fusing alloy are prevented from combining in fabrication and circuit opening operation by flow restricting apertures located near each end of the absorber member.
    Type: Grant
    Filed: October 21, 1980
    Date of Patent: March 23, 1982
    Assignee: McGraw-Edison Company
    Inventor: Andrew L. Pertici
  • Patent number: 4297666
    Abstract: The invention relates to a fuse having a fusible conductor (5) which is wound on a substantially straight carrier body (4). The wire (5) consists of a zinc alloy which contains 0.005% to 2% by weight of manganese.
    Type: Grant
    Filed: January 26, 1979
    Date of Patent: October 27, 1981
    Assignee: Wickmann Werke AG
    Inventor: Nasrollah Asdollahi
  • Patent number: 4219795
    Abstract: A fusible element for electric fuses combining considerable time lag with current-limiting action. Time lag is achieved by providing the fuse with a combination of a plurality of means for achieving this end, such as folding the perforated center portion of the fusible element twice in a direction longitudinally thereof to achieve mutual heating of the folded portion, providing the center portion with end portions or heat dams of reduced cross-section which limit the flow of heat from the center portion to the terminals of the fuse, and are folded in transverse direction, and providing the fusible element with means capable of severing the fusible element by a metallurgical reaction, widely known as M-effect. The M-effect means increase time lag because of their mass and because they derate the fusible element. They cause severing of the center portion of the fusible element and are heated, in addition to i.sup.2 .multidot.
    Type: Grant
    Filed: October 18, 1978
    Date of Patent: August 26, 1980
    Assignee: Gould Inc.
    Inventors: Robert J. Panaro, Philip C. Jacobs, Jr.
  • Patent number: 4177444
    Abstract: A time lag fuse with a fuse barrel having a conductive cap closing each open end and a fuse element within the barrel formed of twisted or bundled insulating fiber spirally bound by a melting alloy of a silver, copper or lead alloy.
    Type: Grant
    Filed: March 23, 1978
    Date of Patent: December 4, 1979
    Assignee: Fukada Works, Ltd.
    Inventor: Minoru Taki