With Fusible Element Directly Connecting Contacts Patents (Class 337/404)
  • Patent number: 8665057
    Abstract: An electronic circuit includes a conductor path on a circuit board, and at least one SMD component, electronic component and/or electromechanical component mounted on the circuit board and connected to the conductor path. A circuit connection is established via a soldered joint and a spring-loaded or stressed springy contact bridge that provides fuse protection. In the event of excessive power dissipation or high temperature, the soldered joint melts or softens and the contact bridge springs open to interrupt the circuit.
    Type: Grant
    Filed: October 7, 2010
    Date of Patent: March 4, 2014
    Assignee: Conti Temic microelectronic GmbH
    Inventors: Roberto Schlenker, Michael Nagel, Juergen Martin
  • Patent number: 8614898
    Abstract: A printed wiring board includes an insulating resinous substrate having an aperture unit, a first terminal unit and a second terminal unit consisting of a conductor and formed on top of the resinous substrate, and a fuse unit that electrically couples the first terminal unit and the second terminal unit to each other. At least a part of the fuse unit is disposed over the aperture unit, and in addition, is covered by a porous inorganic covering material having insulating properties.
    Type: Grant
    Filed: June 9, 2011
    Date of Patent: December 24, 2013
    Assignee: Ibiden Co., Ltd.
    Inventors: Yasuji Hiramatsu, Yuki Terada, Tetsuya Muraki
  • Patent number: 8143991
    Abstract: A current and temperature overload protection device has a brace, a thermal sensing contact, a solder layer, two ports and two resilient elements. The thermal sensing contact, the solder layer, the two ports and the two resilient elements are mounted on the brace, where each resilient element is bent to connect between respective ports and the thermal solder layer. The current and temperature overload protection device is mounted on a circuit board connected in a circuit loop of the circuit board, and the thermal sensing contact is connected to a heat-generating device. Therefore, the current and temperature overload protection device provides protection to the circuit loop from thermal and current overload issues.
    Type: Grant
    Filed: June 30, 2009
    Date of Patent: March 27, 2012
    Inventor: Chin-Chi Yang
  • Patent number: 7864024
    Abstract: An electronic assembly includes an electronic circuit on a circuit board. The circuit includes a conductor path on the circuit board, and at least one SMD component, electronic component and/or electromechanical component that is mounted on the circuit board and connected to the conductor path. A circuit connection between any two of the conductor paths and/or the components is established via a soldered joint and a spring-loaded contact bridge. In the event of excessive power dissipation, the soldered joint melts or weakens and the contact bridge opens due to the spring force.
    Type: Grant
    Filed: March 28, 2006
    Date of Patent: January 4, 2011
    Assignee: Conti Temic microelectronic GmbH
    Inventors: Roberto Schlenker, Michael Nagel, Juergen Martin
  • Publication number: 20090027156
    Abstract: An electronic assembly (1) with a circuit board (2) that is provided with conductor paths or strips (6) and, for forming an electronic circuit, is equipped with a number of SMD components (4) and/or further electronic and/or electromechanical elements through use of a suitable solder, shall be secured with simple means against high power dissipation. For that purpose, according to the invention, a number of connections between conductor strips (6), components and/or elements is produced via respectively one spring-loaded contact bridge (12, 12?, 12?, 12??).
    Type: Application
    Filed: March 28, 2006
    Publication date: January 29, 2009
    Inventors: Roberto Schlenker, Michael Nagel, Juergen Martin
  • Patent number: 7068141
    Abstract: A thermal fuse having a quick melting property is provided. In the thermal fuse, metal layers 15, 16 connected to a fusible alloy 13 are provided at respective leading ends of a pair of metal terminals 11. The metal layers 15, 16 have larger wettability to a fusible alloy 13 than wettability of metal terminals 11 and first insulating film 12. The area (S) of the metal layers 15, 16, the length (L1) and the volume (V) of the fusible alloy 13, the distance (L2) between the leading ends of the metal terminals 11, and the distance (d) from the bottom face of the second insulating film 14 to the top face of the metal layers 15,16 satisfy the relation of Sd>V(L1+L2)/2L1.
    Type: Grant
    Filed: February 20, 2002
    Date of Patent: June 27, 2006
    Assignee: Matsushita Electric Industrial Co., Ltd.
    Inventors: Kenji Senda, Atsushi Kono
  • Patent number: 6801117
    Abstract: A fault sensing electrical wire (411) utilized one or more sensor strips (407) which provide an impedance change when the wire is subject to an overtemperature condition or mechanical damage of the wire. A control unit (402) measures the impedance of the sensor strips of the fault sensing wire and provides a control signal (405) to initiate an alarm or protective action based on the severity of the condition. The control unit (402) may monitor a number of fault sensing sires simultaneously or in sequence. The apparatus may be used to sense an electrical arc occurring in the insulation of the wire.
    Type: Grant
    Filed: November 26, 2002
    Date of Patent: October 5, 2004
    Assignee: B.P.W., Inc.
    Inventors: Shelby J. Morris, Jr., Kenneth S. Watkins, Jr.
  • Publication number: 20040100352
    Abstract: An alloy type thermal fuse is provided in which a ternary Sn—In—Bi alloy is used, excellent overload characteristic and dielectric breakdown characteristic are attained, the insulation stability after an operation can be sufficiently assured, and a fuse element can be easily thinned. A fuse element having an alloy composition in which Sn is larger than 25% and 60% or smaller, Bi is larger than 12% and 33% or smaller, and In is 20% or larger and smaller than 50% is used.
    Type: Application
    Filed: September 4, 2003
    Publication date: May 27, 2004
    Applicant: Uchihashi Estec Co., Ltd.
    Inventor: Yoshiaki Tanaka
  • Publication number: 20040100355
    Abstract: An alloy type thermal fuse is provided in which a ternary Sn—In—Bi alloy is used, excellent overload characteristic and dielectric breakdown characteristic are attained, the insulation stability after an operation can be sufficiently assured, and a fuse element can be easily thinned. A fuse element having an alloy composition in which Sn is larger than 25% and 44% or smaller, Bi is 1% or larger and smaller than 20%, and In is larger than 55% and 74% or smaller is used.
    Type: Application
    Filed: September 4, 2003
    Publication date: May 27, 2004
    Applicant: Uchihashi Estec Co., Ltd.
    Inventor: Yoshiaki Tanaka
  • Patent number: 6710310
    Abstract: The invention relates to armoured heating elements. The invention specifically relates to a heating device (1) consisting of a tubular envelope, wherein a heating element (4) surrounded by insulation (3) is arranged, said heating element (4) is connected to an electric supply circuit by connecting (14) rods and pins (10,12) and said tubular envelope (2) is provided with two cylindrical sealing beads (16) arranged in the ends thereof, whereby at least one of the beads known as a specific bead (16) is in direct contact with the insulation (3) surrounding the heating element (4); The invention is characterized in that the specific bead (16) comprises an axially transversal recess (18), wherein a thermal fuse (20) is inserted and electrically and serially mounted with said heating element (4).
    Type: Grant
    Filed: July 15, 2002
    Date of Patent: March 23, 2004
    Assignee: SEB S.A.
    Inventor: Pascal Hantz
  • Patent number: 6512444
    Abstract: A fault sensing electrical wire (411) utilizes one or more sensor strips (407) which provide an impedance change when the wire is subject to an overtemperature condition or mechanical damage of the wire. A control unit (402) measures the impedance of the sensor strips of the fault sensing wire and provides a control signal (405) to initiate an alarm or protective action based on the severity of the condition. The control unit (402) may monitor a number of fault sensing wires simultaneously or in sequence. The apparatus may be used to sense an electrical arc occurring in the insulation of the wire.
    Type: Grant
    Filed: June 5, 2000
    Date of Patent: January 28, 2003
    Assignee: B.P.W., Inc.
    Inventors: Shelby J. Morris, Jr., Kenneth S. Watkins, Jr.
  • Publication number: 20020153991
    Abstract: The invention relates to an overload protector, in particular for the starter of an internal combustion engine, having a first contact (1), which in a non-tripped state of the overload protector is connected electrically conductively to a second contact (2) by the action of a material (3), and a temperature-caused deformation and/or change in the material (3) for tripping the overload protector brings about an interruption in the electrical connection between the first contact (1) and the second contact (2) if a predetermined temperature value of the material (3) is exceeded.
    Type: Application
    Filed: April 3, 2002
    Publication date: October 24, 2002
    Inventors: Michael Haeusel, Frank Reschnar
  • Patent number: 6445277
    Abstract: A safety device of an electric circuit is provided, in which a thermal fuse securely prevents an accident from occurring when an overcurrent protector is extraordinarily overheated. The safety device includes: first protective means in an overcurrent protector for protecting the electric circuit from an overcurrent, which generates heat to increase its electrical resistance when an overcurrent flows in the electric circuit, whereby reducing or cutting off the overcurrent; and second protective means including a thermal fuse situated in the vicinity of the overcurrent protector containing: a first electrode having a first conductor pattern connected to the overcurrent protector; a second electrode having a second conductor pattern insulated from the first electrode by a gap; and solder connecting the first and second electrodes and melting by heat from the overcurrent protector so as to split into two parts toward the first and second electrodes.
    Type: Grant
    Filed: June 21, 2000
    Date of Patent: September 3, 2002
    Assignee: Yazaki Corporation
    Inventors: Satoshi Ishikawa, Osamu Soda, Hisafumi Maruo
  • Publication number: 20020113685
    Abstract: A thermal fuse reduced in size and thickness can be obtained. Further, the thermal fuse will not be degraded in characteristics, productivity, reliability, quality, etc. even after reduction in size and thickness. The thermal fuse includes a fuse main body including a substrate, a fusible metal and a cover, and paired terminals disposed protruding from the fuse main body. The other end of the first terminal has a first fusible metal connection, and the other end of the second terminal has a second fusible metal connection. The fusible metal is disposed between the first terminal and the second terminal, and one end of the fusible metal is connected to the first fusible metal connection, and the other end of the fusible metal is connected to the second fusible metal connection. The cover is disposed so as to cover the fusible metal, the first fusible metal connection, and the second fusible metal connection.
    Type: Application
    Filed: July 20, 2001
    Publication date: August 22, 2002
    Inventors: Masatoshi Izaki, Takahiro Mukai, Shinichi Ohtsuka, Kenzo Isozaki
  • Patent number: 6198376
    Abstract: A safety device for preventing a trouble caused by an abnormal overheating of an electric circuit is provided, which includes: a circuit board; a first circuit pattern; a second circuit pattern; a first electrode connected to the first circuit pattern; a second electrode connected to the second circuit pattern, while enclosing the first electrode without a break, the second electrode being standoff-insulated from the first electrode; and a solder fuse portion made of a solder and formed over and inside the second electrode for bridging the first and second electrodes, wherein the solder fuse portion in a melted state separates onto the first and second electrodes by surface tension of the solder, whereby a circuit between the first and second circuit patterns is broken.
    Type: Grant
    Filed: September 16, 1999
    Date of Patent: March 6, 2001
    Assignee: Yazaki Corporation
    Inventors: Satoshi Ishikawa, Osamu Soda
  • Patent number: 6040754
    Abstract: A thin type thermal fuse is structured by a resin base film, a pair of belt-shaped lead conductors, a low melting-point fusible alloy piece, flux and a resin cover film. Tip portions of the pair of belt-shaped lead conductors is fixed on the resin base film. The low melting-point fusible alloy piece is coupled between the tip end portions of the belt-shaped lead conductors. The flux applied on the low melting-point fusible alloy piece. The resin cover film which is disposed on a one surface of the resin base film so that a space between said films at peripheries of both the resin cover film and the resin base film is sealed and a space between the resin cover film and the belt-shaped lead conductors is sealed. In the thin type thermal fuse, a relation of (V/L).sup.1/2 /d.ltoreq.1.
    Type: Grant
    Filed: February 26, 1999
    Date of Patent: March 21, 2000
    Assignee: Uchihashi Estec Co., Ltd.
    Inventor: Toshiro Kawanishi
  • Patent number: 6037854
    Abstract: A fluorescent lamp thermal fuse arrangement is disclosed. The arrangement in a preferred embodiment comprises a fluorescent glass tube lamp, a thermal fuse wrapped externally around an end of the lamp, electrically insulated mechanical means, lead portions of the thermal fuse and strain relief, and a thermally and electrically insulating protective cover placed over the thermal fuse to concentrate heat around the fuse and to electrically isolate the lamp end from the surrounding environment. The lamp has a maximum normal operating temperature, a coating of emissive material on a cathode of the lamp, a plurality of lamp cathode leads, and a termination electrically connected to a fluorescent lamp power source. The thermal fuse is electrically connected in series between at least one lamp cathode lead and the termination. The protective cover provides electrical insulation to the surrounding environment and a small space for melted fuse material to flow regardless of lamp orientation.
    Type: Grant
    Filed: May 1, 1998
    Date of Patent: March 14, 2000
    Assignee: Aerospace Lighting Corporation
    Inventors: Jonathan T. Baker, Glenn T. Schmidt
  • Patent number: 5977860
    Abstract: A surface-mount fuse for protecting a circuit, which includes a substrate having first and second surfaces, each surface having first, second, third, and fourth ends, the substrate also having first, second, third, and fourth sides. The fuse includes a metal strip attached to the first surface of the substrate with a layer of adhesive material, the layer of adhesive material being disposed between the metal strip and the first surface of the substrate, the metal strip having a first connection region, a second connection region, and a non-linear fuse link therebetween. The fuse further includes first and second wire leads, the first wire lead being conductively connected to the first connection region and horizontally projecting away from the first connection region, the second wire lead being conductively connected to the second connection region and horizontally projecting away from the second connection region, for connecting the fuse to the remainder of the circuit.
    Type: Grant
    Filed: February 21, 1997
    Date of Patent: November 2, 1999
    Assignee: Littelfuse, Inc.
    Inventors: Steven Francis Ulm, Jr., Edwin James Harris, IV, Matthew Michael Rybka
  • Patent number: 5923240
    Abstract: A temperature fuse for use in an electric circuit provided in an automobile or the like. The temperature fuse includes a pressure-contact terminal having a pressure-contact blade, a temperature opening and closing member having one end connected electrically to the pressure-contact terminal, a signal wire connecting terminal connected electrically to the other end of the temperature opening and closing member, and an insulating case for receiving therein the pressure-contact terminal and the temperature opening and closing member in such a manner that at least the pressure-contact blade and the signal wire connecting terminal are exposed outwardly from the insulating case.
    Type: Grant
    Filed: June 9, 1998
    Date of Patent: July 13, 1999
    Assignee: Yazaki Corporation
    Inventors: Takayoshi Endo, Goro Nakamura
  • Patent number: 5858454
    Abstract: An overcurrent protection device and a method for the production thereof is provided wherein a fusible link is bonded across a pair of electrodes. A composite layer envelops the fusible link and is formed from a gelatinous composition. The composite layer and the fusible link are further encased within a molded housing. The gelatinous composition includes a nonconductive inorganic powder and a synthetic resin. The inorganic powder has a melting temperature below a fusion temperature of the fusible link. In an embodiment, the inorganic powder includes lead glass powder and alumina powder, and the synthetic resin is a low viscosity silicone resin. The inorganic powder is mixed with the silicone resin in a three to one ratio. Heat treatment dries the composite layer. The composite layer includes air pockets between particles of the inorganic powder elastically bound together by the synthetic resin.
    Type: Grant
    Filed: December 27, 1996
    Date of Patent: January 12, 1999
    Assignee: KOA Kabushiki Kaisha
    Inventors: Michiaki Kiryu, Satoru Kobayashi
  • Patent number: 5699032
    Abstract: A surface-mount fuse for protecting a circuit, includes a substrate having first and second surfaces, each surface having first, second, third, and forth ends, the substrate also having first, second, third, and fourth sides. The fuse also includes a metal strip evenly attached to the first surface of the substrate with a layer of adhesive material, the layer of adhesive material being disposed between the metal strip and the first surface of the substrate, the metal strip having a first connection region, a second connection region, and a non-linear fuse link therebetween.
    Type: Grant
    Filed: June 7, 1996
    Date of Patent: December 16, 1997
    Assignee: Littelfuse, Inc.
    Inventors: Steven Francis Ulm, Jr., Edwin James Harris, IV, Matthew Michael Rybka
  • Patent number: 5652562
    Abstract: A thermally fused resistor arrangement wherein a resistor is electrically connected at one end to a first resistor terminal and at an opposite end to a second resistor terminal. A solder loop is provided to make the electrical connection between one end of the resistor and its corresponding resistor terminal. A portion of the solder loop is positioned in contact with an electrically insulated portion of the surface of the resistor, preferably corresponding to the hot spot of the resistor, and a thermally conductive medium is provided to thermally and mechanically attach the solder loop to the electrically insulated portion of the resistor surface. The portion of the solder loop thermally attached to the resistor is operable to melt when the temperature of the resistor increases to within a predefined temperature range, thereby electrically disconnecting the end of the resistor from its corresponding resistor terminal.
    Type: Grant
    Filed: May 21, 1996
    Date of Patent: July 29, 1997
    Assignee: Spectrol Electronics Corporation
    Inventor: Richard E. Riley
  • Patent number: 5567143
    Abstract: Flue-draft-malfunction detector and shut-off control for oil burner furnaces automatically stops operation of the oil burner in event of flue draft malfunction and prevents further running operation of the oil burner until a meltable element in the control is replaced by an intact element. The control casing has a passageway with an inlet on its front end and at least one outlet. The control is mountable on a furnace with the inlet communicating with the furnace combustion chamber. The meltable element is removably positioned within the casing for exposure to the passageway. Two electrical conductors extend from opposite ends of the element and serve as leads connectable in circuit across two terminals of a primary oil burner control so the element completes a circuit between these terminals.
    Type: Grant
    Filed: July 7, 1995
    Date of Patent: October 22, 1996
    Inventor: Patrick F. Servidio
  • Patent number: 5363083
    Abstract: A temperature responsive electric overcurrent protection module incorporated in an electric circuit on a circuitboard has a PTC resistor which heats up when subjected to an excessive current. Its resistance rises with its temperature to control the current and protect the circuit, including electric components thereof. To protect the circuit against occasionally encountered, large overcurrents, which could damage the circuits and/or cause a burn-out, a thermal switch or overcurrent fuse is provided which comprises an electrically and thermally conductive contact plate, and an associate thermal switch formed by a planar frame secured to the substrate and a spring arm protruding therefrom.
    Type: Grant
    Filed: June 11, 1993
    Date of Patent: November 8, 1994
    Assignee: Roederstein Spezialfabriken fuer Bauelemente der Elektronik und Kondensatoren der Starkstromtechnik GmbH.
    Inventor: Kurt Fischer
  • Patent number: 5173593
    Abstract: A car-borne electric cigar lighter includes a receptacle having a spring contact for receiving the heater element of the lighter for energization. A pair of spaced electrially conductive connecting plates form part of the electrical circuit to the spring contact. A circuit breakable electrically conductive spacer including a heat resistant, form-retaining resilient plate of an electrically insulating rubber, e.g., silicone rubber, penetrated between opposite surfaces with a thermally fusible, electrically conductive portion made from a low melting point metal, e.g., tin foils, to be in contact with the two connecting plates on both sides of the spacer forms an electrical connection between the plates through the tin foils. In case of overheating, the tin foils are melted down to open the electric circuit to the spring contact without losing the mechanical integrity of the spacer to serve as an insulator between the connecting plates.
    Type: Grant
    Filed: December 13, 1990
    Date of Patent: December 22, 1992
    Assignee: Shin-Etxu Polymer Co., Ltd.
    Inventors: Tutomu Ogino, Akio Nakamura
  • Patent number: 4933658
    Abstract: A high temperature fluid sensor has a fusible detector including a body having longitudinally extending conductors therein. A first portion of the conductors is confined within the body whereas a second portion of the conductors projects from an end of the body. The second conductor portions are spaced-apart to define a void therebetween. A fusible material is engaged with, and electrically bridges between the second conductor portions. A tapered portion of the sensor permits the molten fusible material to flow away from the second conductor portions. The tapered portion terminates in spaced-apart relationship with the fusible material and thus further defines the void.
    Type: Grant
    Filed: May 10, 1989
    Date of Patent: June 12, 1990
    Assignee: Ingersoll-Rand Company
    Inventors: Don J. Gerhardt, Randal A. Little, F. William Capp
  • Patent number: 4881055
    Abstract: The Sensor is designed for use in detecting fire, or high temperature in vessels or pipes pressurized with air, gas or liquids. It has a polymer body which confines electrical conductors, and the conductors project from opposite ends of the body. The conductors' projections at one end define terminal blades, and at the opposite end are shrouded with, and electrically connected by, fusible material that has been molded in place. The body has wrenching flats thereabout and tapered pipe threads thereon to allow its installation in the wall of a pressure vessel, pipe, or housing, with the fusible-material end exposed therewithin.
    Type: Grant
    Filed: November 10, 1988
    Date of Patent: November 14, 1989
    Assignee: Ingersoll-Rand Company
    Inventors: F. William Capp, Don J. Gerhardt, Randal A. Little
  • Patent number: 4746892
    Abstract: A thermally actuated latch for electrical circuits is permanently operative for completing an electrical circuit upon exposure to a predetermined elevated temperature. The latch includes a fixed contact, a movable contact arm which is biased toward the fixed contact, a movable contact on the movable contact arm, and a deformable pellet. The deformable pellet communicates with the movable contact arm through a communicator disc to normally maintain the movable contact in spaced relation with the fixed contact. The pellet is deformable to a disposition of reduced profile upon exposure to a predetermined elevated temperature to allow the movable contact to be resiliently moved into engagement with the fixed contact in order to complete an electrical circuit connected to the latch.
    Type: Grant
    Filed: April 17, 1987
    Date of Patent: May 24, 1988
    Assignee: Elmwood Sensors, Inc.
    Inventor: Keith M. Musto
  • Patent number: 4622534
    Abstract: A thermal fuse for use in interconnection of lead acid batteries which will fuse as a result of heat being conducted through the fuse from the batteries or other devices to which it is attached, rather than as a result of direct heating of the fuse consequent on the current carried by the fuse. The fuse has a pair of mounting plates connected to terminals of the fuse with a heat meltable electric current conducting material in solid form disposed between the plates to provide a flow path for electric current. A member is also disposed between the plates connecting with the solidified heat meltable material and of sufficient mass so that when the material melts, the member draws substantially all of the material with it as it falls due to gravity from between the mounting plates.
    Type: Grant
    Filed: February 14, 1985
    Date of Patent: November 11, 1986
    Inventor: Noel T. Bowman
  • Patent number: 4472705
    Abstract: A bimetallic disc actuated thermostatic switch with thermal override comprises a base, a fixed contact on the base, a movable contact and a bimetallic disc which moves the movable contact into and out of engagement with the fixed contact to effect or interrupt continuity therebetween. A thermal override pellet which melts or deforms in response to an excessive temperature is provided in a cavity in the base and the fixed contact is mounted on a resilient arm which overlies the pellet. When an excessive temperature is reached, the pellet fuses or deforms and the fixed contact arm and the fixed contact move toward the base to separate the fixed and movable contacts even when the latter is in its normally engaged position.
    Type: Grant
    Filed: January 3, 1983
    Date of Patent: September 18, 1984
    Assignee: Elmwood Sensors, Inc.
    Inventor: Richard H. Carlson
  • Patent number: 4441093
    Abstract: A thermal fuse comprises a coiled spring interposed in a stretched condition between two opposed conductors in such a fashion that the spring is imparted with tension and is soldered by a fusible alloy having a specified fusing point. The coiled spring is cut at one portion so that a circuit between the two conductors is broken upon fusing of the fusible alloy due to the action of the coiled spring cut at one portion.
    Type: Grant
    Filed: April 8, 1982
    Date of Patent: April 3, 1984
    Inventor: Tasuku Okazaki
  • Patent number: 4415796
    Abstract: An adjustable stacked thermostat assembly, particularly for use in an electric appliance, such as an electric steam iron, includes a lower bimetallic heat deformable blade, an intermediate stiff conductive spring blade carrying a electrical contact and connected to a first electric terminal and an upper less stiff conductive spring blade carrying a cooperating contact and connected to a second terminal, with all of the blades being supported, secured and spaced apart at one end by interposed insulators. In operation movement of the deformable blade is transmitted to the upper blade to make and break the contacts to control heat to the appliance controlled by the thermostat.
    Type: Grant
    Filed: May 4, 1981
    Date of Patent: November 15, 1983
    Assignee: General Electric Company
    Inventor: Charles A. Balchunas
  • Patent number: 4208647
    Abstract: A thermal switch for automatically opening a circuit when the ambient temperature exceeds a predetermined level is disclosed which utilizes a sensing pellet formed of an organic-glass bead mixture. The organic-glass bead pellet retains a pair of leads in contact with each other when the ambient temperature is below the melting temperature of the organic material. The addition of the glass beads to the temperature sensing pellet allows the compressive strength that is needed to hold the leads together to be more reliably controlled. In the process of combining the organic material and the glass beads, to form the pellet, the organic material is first melted so as to flow around the beads. Manufacture of the thermal-sensing pellet in this manner eliminates the voids which occur in the pressed organic pellets that are conventionally used in thermal sensing devices.
    Type: Grant
    Filed: September 7, 1978
    Date of Patent: June 17, 1980
    Assignee: Illinois Tool Works Inc.
    Inventors: John K. McVey, Bruce A. Luxon
  • Patent number: 4160968
    Abstract: A temperature sensitive normally open electrical switching device has a pair of normally isolated, current carrying leads. A casing defines a central cavity and encloses first and second electrodes which are electrically connected to separate ones of the leads. An electrically conductive, fusible pellet is positioned in the cavity and melts at a predetermined temperature to form an electrically conductive path between the electrodes, regardless of the orientation of the device. The first electrode is concave and the second electrode extends into the concavity formed by the first electrode.
    Type: Grant
    Filed: May 31, 1977
    Date of Patent: July 10, 1979
    Assignee: Emerson Electric Co.
    Inventor: Sarmukh S. Saini
  • Patent number: 4135176
    Abstract: A thermal switch device for automatically opening a circuit when the ambient temperature is increased to a predetermined level. A pair of conductor wires arranged in side by side fashion are spring loaded into contact with one another by inserting the contact regions into a cup-shaped pellet of heat-fusible material. The cup is structurally secured within a nonconductive tubular casing with a layer of insulative cement. The lead regions of the wires are also securely anchored within the casing with an insulative cement.
    Type: Grant
    Filed: October 21, 1977
    Date of Patent: January 16, 1979
    Assignee: Illinois Tool Works Inc.
    Inventors: John K. McVey, Bruce A. Luxon, Larry L. Sharp
  • Patent number: 4124835
    Abstract: Apparatus for selectively disconnecting the electric service of individual customers from an electric power supply line by electrical signals transmitted from a central point remote from the customer's premises. A circuit interrupter, such as a circuit breaker or, preferably, a fuse, is connected in series with the circuit of each of the customers, and is operated by a coded signal, transmitted from the central point by radio waves or over telephone or power lines, which is received by apparatus at the customer's premises and thereupon actuates the interrupter. Preferably, the coded signal is transmitted to the customer's premises using the same apparatus used to remotely read the customer's utility service meter, such being an Automatic Remote Meter Reading (ARMR) system of a known type which would also be installed. Also, novel remotely operable fuses which are particularly suited for use as the circuit interrupter in the system are described.
    Type: Grant
    Filed: March 26, 1976
    Date of Patent: November 7, 1978
    Inventor: William J. Cahill, Jr.
  • Patent number: 4032877
    Abstract: A heat-sensitive protector, that is connectable into an electric circuit, has an elongated, effectively non-fusing element which performs the function of a connector as long as that protector is intact, and thereafter moves fron a retracted position to an extended position to perform the function of an indicator when that protector responds to heat to open that circuit. That element spans the full distance between the terminals of that heat-sensitive protector.
    Type: Grant
    Filed: May 3, 1976
    Date of Patent: June 28, 1977
    Assignee: McGraw-Edison Company
    Inventor: Craig L. McAlister, deceased
  • Patent number: 4017818
    Abstract: A thermal switch for automatically opening a circuit when the ambient temperature is increased to a predetermined level. A pair of conductor wires are arranged in side by side fashion with extremities extending in the same direction. A spring portion is included in at least one of the conductor wires to provide stored energy when the spring is biased into electrical contact with each other. A localized contact region is included in the conductor wire in the region below the spring portion. The extremities, contact region, and spring being encapsulated with a heat fusible material which biases the conductor wires into contact with each other and which is coated with a rigid insulating material to retain the conductor wires electrically insulated from each other except at the contact region.
    Type: Grant
    Filed: December 22, 1975
    Date of Patent: April 12, 1977
    Assignee: Illinois Tool Works Inc.
    Inventor: Charles Calvin Rayburn
  • Patent number: 4016522
    Abstract: A thermal switch for automatically opening a circuit when the ambient temperature is increased to a predetermined level. A pair of conductor wires are arranged in side by side fashion with extremities extending in the same direction. A spring portion is included in at least one of the conductor wires to provide stored energy when the spring is biased into electrical contact with each other. A localized contact region is included in the conductor wire in the region below the spring portion but spaced upwardly from the associated extremities to create a lever arm. The extremities, contact region, lever arm and spring being encapsulated with a heat fusible material which biases the conductor wires into contact with each other and which is coated with a rigid insulating material to retain the conductor wires electrically insulated from each other except at the contact region.
    Type: Grant
    Filed: December 22, 1975
    Date of Patent: April 5, 1977
    Assignee: Illinois Tool Works Inc.
    Inventor: Larry Lee Sharp
  • Patent number: 4016523
    Abstract: A thermal switch for automatically opening a circuit when the ambient temperature is increased to a predetermined level. A pair of conductor wires are arranged in side by side fashion with extremities extending in the same direction. A first spring portion is included in at least one of the conductor wires to provide stored energy when the spring is biased into electrical contact with each other. A localized contact region is included in the conductor wire in the region below the first spring portion. A second spring portion is also included in the conductor wire between the first spring and the associated extremity of the wire. The extremities, contact region, and spring regions being encapsulated with a heat fusible material which biases the conductor wires into contact with each other in a preloaded condition. A coating of rigid insulating material, retaining the conductor wires electrically insulated from each other except at the contact region, is provided over the heat fusible material.
    Type: Grant
    Filed: December 22, 1975
    Date of Patent: April 5, 1977
    Assignee: Illinois Tool Works Inc.
    Inventor: Edward Frank Sidor
  • Patent number: 4001799
    Abstract: An apparatus activates an alarm when the heat and temperature provided by a kiln reach a predetermined level. The apparatus includes a tube extending through the wall of the kiln. An integral mounting surface at the end of the tube inside the kiln provides a surface upon which can rest a pyrometric cone. An elongated member extends through the bore of the tube resting on the pyrometric cone at one end and secured to a pivot point at the other end outside of the kiln. An alarm switch is mechanically coupled to the elongated member. When the elongated member descends because the cone deforms an alarm is activated.
    Type: Grant
    Filed: July 9, 1975
    Date of Patent: January 4, 1977
    Inventor: Dominic P. Sondy
  • Patent number: 3995246
    Abstract: A device for controlling the temperature and protecting against excessive flow of current of electric installations, said device being provided with a mechanical switch which opens itself at a definite previously selected temperature, said mechanical switch comprising cylindrical housing wherein two elastic contact means are provided, one of the contact means comprising an open spring spiral torsion with bent ends which is provided around a melting body of thermally softenable material and is pressed with a tension directly against the spring action of the other contact means.
    Type: Grant
    Filed: February 4, 1975
    Date of Patent: November 30, 1976
    Inventor: John M. Morgan