Abstract: A low voltage heating element for portable tools includes a low voltage, low current light bulb wrapped with a thin layer of metal darkened on its bulb-facing surface. Apertures in the metal layer allow the light from the bulb to be utilized in addition to its heating characteristics. Rechargeable batteries are installed in the handle of the tool to power the light bulb. An electrical jack in the tool housing may be plugged into an external power source for providing power for a greater length of time. A cordless soldering iron includes a low voltage, low current light bulb affixed to the tip of a conventional soldering iron, the conventional heating element having been removed from the housing. The bulb is wrapped with a layer of metal darkened on the bulb-facing surface, and is electrically connected to rechargeable batteries mounted either in the housing of the soldering iron, or within an external pack.

Abstract: Provided is a cartridge soldering iron having a hollow cylindrical handle, incorporating an internal coaxial socket assembly, a connection to a power supply, and a cartridge housing support, and a soldering tip bearing cartridge incorporating a tip, a heater assembly, a tubular housing and a coaxial socket assembly adapted to mate with the handle socket assembly in a wiping electrically conductive manner.

Abstract: A soldering iron tip comprises a copper body with a layer of glass bonded on the surface. The portion of the body used for melting solder is not coated. The glass is opaque to infrared, has high, uniform and stable emissivity, helps prevent oxidation, limits wetting of the tip by solder, and is easily kept clean. The glass is readily applied to a soldering iron tip by melting a frit. Such a glass layer provides electrical insulation from a soldering iron and prevents leakage electric current from damaging sensitive components. A method is provided for measuring temperature of an article during soldering by applying a glass which absorbs infrared to a portion of the article and measuring infrared emittance from the glass during soldering.

Abstract: The open end of a flexible material container surrouding the sucker stick on a sucker is sealed therewith in a wrap-around action by manual angular rotation of the sucker and its stick when the latter is temporarily maintained in contact with the heated surface of the walls forming a U-shaped recess in a candy wrapper heat sealing head.

Abstract: A temperature controlled soldering iron wherein the same pair of dissimilar conductors, joined together, unitarily provides a soldering tip, a heating element for heating the soldering tip and a thermocouple for sensing the temperature of the soldering tip. When current is supplied to the conductors, a temperature effect is produced which is in addition to the normal heating of the conductors and results in a corresponding voltage which varies directly with the temperature of the conductors. The voltage is applied to a control circuit where it is amplified, compared against a reference voltage, corresponding to a pre-selected soldering temperature, and the voltage derived from said comparison is applied to regulating the current used for heating the dissimilar conductors. The dissimilar conductors are formed from wires of dissimilar metals and mounted in a generally cylindrical handle by a means which minimizes handle temperatures.

Abstract: An improved performance ferromagnetic self-regulating heater. Constant alternating current is applied to a layered structure including at least one ferromagnetic layer. One or more layers of non-magnetic material is added to the ferromagnetic layer in such a way that the power factor of the heater is very significantly increased above its value in the absence of at least one of the layers. The alternating current flows through the different layers in varying quantities depending on layer composition, temperature and Curie point of the ferromagnetic layer. The structure generates heat by resistive heating as a function of the power applied. In one embodiment a single layer of non-magnetic, high-resistance material is in intimate electrical and thermal contact with one surface of the ferromagnetic material.

Abstract: A hand-held electrically heated tool for applying heat to an object includes an elongated metallic tubular handle open at its forward and rear ends and having a plurality of raised relatively-spaced longitudinally extending vanes formed on its the inner surface and extending between the forward and rear ends thereof. An exposed metal electrical resistance heating element forming a wire tip is mounted in an insulator disposed in the forward end of the handle in engagement with the vanes with the tip extending forwardly of the handle. A spherically concave portion of the insulator reflects heat away from the handle.

Abstract: This disclosure concerns an improved tip for a soldering iron comprising a material which is both a good heat conductor, as well as a good electric insulator, such as for example an AlN ceramic. This ceramic may contain one or more metal coatings wettable by the solder used. The ceramic tip may be heated by an electric resistance coil around an extension from the tip and covered with a shield, or the tip may be hollow and have the heating element inside it, preferably adjacent the tip end.

Abstract: A soldering gun has a finger actuated rotary solder feed unit and a solder cartridge releasably coupled to the gun. A solder guide tube extends forwardly parallel to the cylinder and guides the solder into engagement with the heated tip. The guide tube is mounted for vertical and angular orientation relative to the cylinder for locating the solder relative to the tip. A rotating ratchet feed wheel is connected to the trigger and has teeth engaging the underside of the solder. A set screw is located in the path of trigger to adjust the trigger stroke and thereby the length of the solder fed to the tip. A pressure wheel is mounted to firmly hold the solder to the feed wheel and is secured to a spring-loaded and pivoted T-shaped lever within the gun housing. The T-shaped lever has the pressure wheel rotatably mounted in the cross bar and the stem projecting upwardly into engagement with a bias spring. The lever has a release arm for manual pivoting of the lever to release of the solder.

Abstract: Apparatus for connecting a coaxial cable to a connector having a base for connection to a conductive shield of the cable via a solder ring within a heat-shrinkable tube, the apparatus including a first fixture for engaging an end of the coaxial cable and connector and a first heater mountable in a predetermined position with respect to the fixture for directing a controlled amount of heat to the solder and heat-shrinkable tube.

Abstract: A glue gun includes a glue stick feed path, a heating assembly in the feed path and a glue stick feeding system. A trigger includes a gear rack extending along its upper surface and the feeding system further includes a pinion having rim teeth which engage a glue stick positioned in the feed path. The trigger is mounted for movement in a direction substantially parallel to the glue stick feed path axis and drives the pinion to advance the glue stick, when the trigger is squeezed. The trigger includes a pin extending in a guiding channel of the glue gun to permit tilting the rack toward the glue stick feed path. The pinion is mounted in a channel for displacement perpendicular to the feed path axis so that it bears against the glue stick when the trigger is tilted. The pinion may be provided with two rows of rim teeth and a portion of the glue stick periphery may extend into a trough formed between the rows.

Abstract: An autoregulating electrically shielded heater employs a structure of two magnetically permeable members of different Curie temperatures and preferably differing resistivities. The two members are in electrical contact with one another; having at their interface a very low resistivity layer or member provided by copper or a like material. A first of the electromagnetic members has the lower Curie temperature and high resistivity while the other of said members has the higher Curie temperature of the two and preferably lower resistivity. A constant current a.c. source is connected to induce currents in the members parallel to their interface. Below the Curie temperature of the first member, current is substantially confined to a narrow region along a surface remote from the interface. Above the Curie temperature, some of the current spreads into the low resistance layer or member and into the second electromagnetic member where it is confined, due to skin effect to a narrow region adjacent the interface.

Abstract: A bobbin assembly for a soldering/desoldering device may be readily produced by utilization of a heater assembly comprising an electrically insulating tape having an etched foil heater in the form of serpentine comprising a plurality of coextensive side by side parallel leg portions bonded to one side thereof. The bobbin assembly is formed by wrapping the heater assembly about a cylindrical bobbin with the heater leg portions parallel to the bobbin axis so as to form a first insulating layer in contact with the bobbin, a layer comprising the heater in contact with the first layer and a second insulating layer in contact with the heater. A wire is then wound about the entire assembly, in a helical manner, to hold all elements in place. Additionally, a dissimilar metal lead may be spot welded to the bobbin to form a thermocouple junction used for sensing the bobbin assembly temperature.

Abstract: The impedance of an autoregulating heater is greatly increased by employing in one embodiment a return conductor in the form of a helix surrounded by and insulated from a magnetic conductor; the two conductors connected in series or as a transformer across an a.c. source whereby the current in the magnetic material is forced to follow a helical path. In a preferred embodiment, a multilayered coil is wrapped about and insulated from a magnetic sleeve disposed about a copper rod; the sleeve and rod forming the secondary of a transformer. The helical path of the current in the secondary plus the impedance transformation effect of the transformer greatly enhances the impedance of the load as presented to a current source. The winding is enclosed within another magnetic sleeve which provides another magnetic shield about the heater and if connected at one end to the inner magnetic layer increases the width to thickness ratio for purposes to be described.

Abstract: A hand held, electronically controlled soldering instrument in which the electronic control module is placed several feet along the power cord away from the tool utilizes the power cord leads to measure the resistance of the heater element during each inflection point of the AC input power. The resistance magnitude is used to provide a signal which is a function of the temperature of the heater element. This signal, in turn, is used to control the electric current to the heater element. This arrangement thermally isolates the heater element and the sensitive electronic control circuit and also removes the heat generating circuitry from the handle of the soldering tool. The handle is further cooled by minimizing the heat flow from the heater element to the handle and by using conductors in the power cord as heat sinks to remove heat from the base end of the heater element shaft.

Abstract: This invention is a cautery hemostatic unit which is deliverable through endoscope and used for stopping hemorrhage by cauterizing bleeding wound, is to be attached to the distal extremity of sheath, and forms a gutter-like nozzle which communicates with water channel of the above-mentioned sheath in direction of outer axis of cautery probe wherein a thermal element is incorporated, and the angle of this nozzle is set so that water may be jetted out linearly along the direction of the outer axis of probe. This unit fixes the main unit that composes the above-mentioned probe and a cap with a joint connector which permits freely jointing and disconnecting.

Abstract: A thermal cautery system having an endoscopically deliverable probe connected to a power supply and display unit. The power supply and display unit, when triggered by a footswitch, energizes a voltage regulator having a current limited output that supplies power to the probe. The current limiting function of the voltage regulator is disabled for a predetermined period that power is initially applied to said probe to minimize the heating time of said probe. The current through said probe is sensed and used to increase the voltage at the output of the voltage regulator as the current increases to compensate for the voltage drop in the conductors connecting the probe to the power supply. A manually selected portion of the sensed current through the probe is also integrated and used to terminate the flow of current through the probe when the integral of the current with respect to time has reached a predetermined value.

Abstract: A portable decal stripping tool particularly adapted for the quick removal of adhesive decals from an automotive surface and comprising a decal stripper attachment for a soldering iron including an elongate shaft with a head portion secured thereto adapted to removably engage and support a razor blade. The decal stripper attachment is constructed of heat conductive material which facilitates elevation of the temperature of the razor blade secured therein so that it will slide under and remove a decal by melting the adhesive securing it to an automobile surface or the like.

Abstract: A soldering iron bit is heated by an electrical heating element including a resistive element consisting of granular boron carbide packed in a quartz tube embedded in a piece of copper. A first power lead is electrically connected to the boron carbide at one end of the quartz tube. This first power lead passes through and is electrically insulated from the piece of copper. The second power lead is electrically connected to the boron carbide at the other end of the quartz tube, either directly or via the piece of copper. In use, connection of the first and second leads to an electrical power source causes the resistive element to generate heat in a very fast manner and to transmit this heat to the piece of copper. The piece of copper may be connected to or constitute the soldering bit and can be provided with a built-in thermostat comprising a meltable salt inserted in a hole provided in the piece of copper.

Abstract: Previously, hook-up wires were glued to a mounting board by means of spot gluing. As disclosed herein, the insulated hook-up wire is first continuously coated with a coating of hot-melt adhesive and is then placed on the mounting board and simultaneously bonded by means of a heated laying tip of an application tool, similar to a soldering bit. When passing through the laying tip, the hook-up wire is briefly heated, whereby the coating of hot-melt adhesive is melted. The insulating layer of the hook-up wire has a higher temperature stability and is thereby not altered. In the immediately following application of the hook-up wire to the mounting board, the hot-melt adhesive cools and connects the hook-up wire to the mounting board.

Abstract: An apparatus for forming a line of separation in a plastic work surface includes a tool having a tool holder of thermally conductive material, an electric heating element and a tool member having a separating point. The holder is surrounded by an insulating member and includes a sleeve portion in which the tool member is releasably secured, the tool member projecting from the body in freely exposed manner with the separating point remote from the holder whereby the work surface may be engaged solely by the separating point which comprises a tip from which a surrounding surface extends in divergent manner. The holder is arranged to conduct heat from the heating element to the tip and suitable control means are provided for regulating the heating element temperature to a desired value.

Abstract: A miniaturized, endoscopically deliverable thermal cautery probe for cauterizing internal vessels. The probe is applied to tissues cold, and a large number of electric heating pulses of equal energy are then applied to an internal heating element in the probe. The probe has an internal heating element in direct thermal contact with an active heat-transfer portion that has a low heat capacity to insure quick heating and subsequent cooling, thereby adequately coagulating tissue while minimizing heat penetration and resulting tissue damage. The electrical power applied to the probe is continuously measured and is terminated when the energy delivered reaches a preset value. The number of such pulses applied to the probe (and hence the total energy delivered) may be preset while the duration of the period during which the pulses were applied is displayed.

Abstract: A hand-held electric soldering/desoldering tool has an elongated soldering tip secured to one end of an elongated handle in substantially coaxial alignment therewith by means of a three-point, spring loaded mechanical suspension arrangement resiliently securing the soldering tip to the handle for allowing excessive pressure applied to the handle to be taken up by the spring-loaded suspension thereby preventing such excessive pressure from being applied to a workpiece. The three-point suspension arrangement includes three support members fixed to the handle and having juxtaposed ends passing freely through aligned openings in a support plate attached to the soldering tip. Each support member has a head biased into engagement with the support plate by a coil spring surrounding the support member and disposed between the support plate and handle.

Abstract: An electrical ice cream dipper is provided and consists of a handle portion having a finger grip area, a scoop portion having a semi-spherical bowl therein affixed to the handle portion, means for heating the scoop portion, means for controlling the temperature in the scoop portion and a stand having a pair of folding legs built into the handle portion so that the scoop portion will be supported when not in use.

Abstract: A seam presser including an elongate handle housing circuitry for switching electrical power to a heating element. The heating element conducts heat to a small sole plate which is connected to the handle end by a support means. The sole plate is no wider than the seam to be pressed and is mountable to the support means so that the plane of the sole plate undersurface is angled with respect to the handle, and mountable to the support means at a desired rotational angle with respect to the handle.

Abstract: A device for applying marking symbols to an animal's hide, a piece of meat's surface and like protein-containing tissue by locally dielectrically heating the tissue using high frequency electromagnetic energy to thereby dissect the protein structure and produce a mark having a different color than the surrounding tissue. The device comprises a stamping member including a metal symbol electrode having a protruding portion which is applied in use to the protein-containing tissue and an electrically insulating holder, such as a refractory material, in which the electrode is protrudingly mounted; a high frequency generator having a frequency range of from 2 to 22 MHz, most preferably from 2 to 4 MHz, and an output power of from 20 to 1000 Watts; and preferably a switching means for selectively establishing electrical connector between the stamping member and the high frequency generator to thereby send electromagnetic energy into the tissue upon which the protruding portion of the electrode is applied.

Abstract: A device for dismounting an integrated circuit package soldered on a printed electric circuit board by melting the solder, including an electric heater which heats a heating shank disposed so as to contact upper portions of soldered portions of a plurality of leads soldered to circuit ends on an electric circuit board wherein the leads extending from side walls of an IC package mounted on the board. A suction cup member is disposed in a center portion of the heating shank so as to face an upper surface of the IC package and dismount the IC package sucked thereby from the board after melting the solder.

Abstract: The cutting instrument of this invention is made by threading a heater assembly through a hollow cutting instrument body. A blade having a shank and a blade body including a cutting edge is secured within the hollow cutting instrument body at its shank portion such that the blade body extends from the hollow cutting instrument body. The heating assembly is secured to the blade body and to the cutting instrument body. The blade body is coated with a non-stick means.

Abstract: An electric soldering iron includes an elongated metal housing tube enclosing a metallic heat conducting member having a first zone snugly fit within the housing and having a portion projecting out of the front end thereof for removably receiving a soldering tip. A second zone of the member extends rearwardly from the first zone and has a smaller cross section than the interior of the tube to create an insulating space therebetween. The heat conducting member is formed with an opening sized and shaped to receive the end of an elongated flat ceramic heater having embedded therein an electric heating element. The portion of the ceramic heater not located within the heat conducting member is surrounded and positioned by a refractory heat insulating tube abutting the rear end of the heat conducting member.

Abstract: A relatively inexpensive electric soldering iron and handle structure can be constructed so as to be relatively simple to assemble by utilizing cooperating holding elements within a tubular handle to form a holder. This holder serves to support or hold a socket adapted to support a heating element and a cord retainer in place within the handle. The holder is in turn held in place within the handle through the use of cooperating detent elements on both the holder and on the handle. The parts of the soldering handle structure are dimensioned so that the parts previously identified can be inserted as a unit into the handle through one end of the handle as the cord is withdrawn outwardly from the other end of the handle.

Abstract: A miniaturized, endoscopically deliverable thermal cautery probe for cauterizing internal vessels. The probe is applied to tissues cold, and a large number of electric heating pulses of equal energy are then applied to an internal heating element in the probe. The probe has an internal heating element in direct thermal contact with an active heat-transfer portion that has a low heat capacity to insure quick heating and subsequent cooling, thereby adequately coagulating tissue while minimizing heat penetration and resulting tissue damage. The electrical power applied to the probe is continuously measured and is terminated when the energy delivered reaches a preset value. The number of such pulses applied to the probe (and hence the total energy delivered) may be preset while the duration of the period during which the pulses were applied is displayed.

Abstract: An improved thermal barrier for rigidly connecting the heater assembly to a handle assembly in a desoldering device. In a preferred embodiment, the thermal barrier includes a slotted spacer portion which is connected to the heater assembly and serves to reduce heat transferred into the thermal barrier by means of radiation, convection and reduced conductivity. The thermal barrier also includes a portion connecting the slotted spacer portions to mounting sections which are connected to the handle assembly such that an indirect path for heat conduction is established between the heater assembly and the handle assembly. In some preferred embodiments, a fin is included to increase the surface area of the thermal barrier and further transfer heat from the thermal barrier to the atmosphere.

Abstract: An electrically heated convertible tool for removing a golf club head from a shaft inserted in the hosel of both metal and wooden golf club heads includes a pair of plier-like pivotally connected opposed jaws each carrying an electric heating block. The heating blocks are disposed in opposed clamping relationship and are each provided with an arcuate recess sized to closely engage and heat the tapered hosel surface of a metal golf club head. The blocks are adjustable relative to each other to accomodate for size variations in hosels. An elongated heat exchange member having a head sized to be clamped in the arcuate recesses of the blocks and an elongated linear portion sized to be insertable into the interior of a hollow metal golf club shaft is provided to permit use of the tool to heat the hosel of a wooden club head. The tool permits heat to be applied to the hosel of the club heat to soften the cement holding the hosel to the shaft of the golf club.

Abstract: A heated bonding tool for the manufacture of semiconductor devices comprises a high density non-porous alumina body having a mounting portion at one end and a working portion at the other end. The working portion end is tapered and converges toward the working tip portion. An electrically conductive-resistive thick film is deposited over the outer surface of the tapered portion intermediate said mounting portion and said working tip portion which is capable of heating said working tip of said bonding tool up to 600.degree. C. Preferably the thick film material has a positive or negative temperature coefficient of resistance which permits the temperature of the working tip to be monitored as a function of the measured resistance of the thick film. An insulative heat resistant terminal block is provided with a pair of resilient leads connected to a power source.

Abstract: An electrically heated spatula for working heat softenable materials, such as dental wax, includes an elongated hollow sleeve secured at one end to a handle and having a heat producing diode unit supported at the other end. The diode unit includes a hollow metallic cylinder with an apertured metallic end wall. A forward biased diode has a threaded mounting stud disposed in the end wall aperture and is supported in interior of the cylinder in spaced non-contacting relation thereto. The stud extends outwardly of the other end of the sleeve and removably supports a working tip. Power supply conductors extend through the handle and sleeve and are connected to the anode of the diode within the cylinder and to the cathode of the diode through the cylinder, end wall and mounting stud. The arrangement minimizes undesirable transfer of heat from the diode to the cylinder and sleeve and maximizes transfer of heat through the threaded stud to the tip.

Abstract: The heating element consists of a substrate or core of a non-magnetic material having high thermal and electrical conductivity, clad with a surface layer of a ferromagnetic material of relatively low electrical conductivity. When the heating element is energized by a source of high frequency alternating current, the skin effect initially confines current flow principally to the surface layer of ferromagnetic material. As temperature rises into the region of the Curie temperature of the ferromagnetic material, however, the decline in magnetic permeability of the ferromagnetic material causes a significant lessening of the skin effect, permitting migration of current into the high conductivity non-magnetic core, thereby simultaneously enlarging the cross-sectional area of the current flow path and expanding it into the highly conductive material; the resistance of the heating element becomes less due to both causes.

Abstract: A temperature controlled heat delivery head for heat staking electrical contact retention clips in rapid succession in an insulator. A large heat-conductive body acts to store heat and to deliver it to a substantially smaller heat-conductive projection. The body is maintained at, for example, about 820.degree. F. The projection is maintained at, for example, about 830.degree. F.

Abstract: An electrically heated tip assembly, particularly useful with a cyclically operated thermal press usable for forcible placement of inserts of hard material within bases of softer materials, includes a generally longitudinal tubular core member formed of a thermally conductive material. The core encloses an electric resistance heating element and has a tip element secured to one end thereof in heat exchange relationship with the heating element. The tip element includes a protruding finger member engageable with an insert and a paraboloidal section between the core member and protruding finger member to facilitate the concentration of heat downwardly into the finger member during the insertion portion of the operating cycle of the press.

Abstract: A writing pen for heat developing photoconductive material including a pen having a nib formed of material of high thermal conductivity and pervious to light, for contacting photosensitive heat developing material. The pen has a light source for illuminating the photosensitive material through the pen nib contacting the material, and a heater embedded in the nib for heating the nib portion in contact with photosensitive material. The pen nib may include a light-pervious rotatable ball tip seated in a light-pervious ball receptacle.

Abstract: An electrically heated tartlet press for forming pastry shells upon application of pressure and heat to a body of pastry dough seated on the bottom of a tapered well in a tart pan, comprising an enlarged tapered cylindrical head fabricated from rigid heat conductive material and having a flat bottom wall of minor diameter adapted to extend into the well, an outwardly inclined side wall of major diameter at its upper end, and a tapered flange extending radially outwardly from the inclined wall and adaptable to bear against the pan well entry and center the head when pressed into the pastry dough; an insulated shaft upstanding centrally of the head; a core of heat transmitting material within the shaft in heat conducting relation with the head; an electrical heating element within the shaft and in heat conducting relation with the core; an electrically and heat insulated handle remote from the head at the other end of the shaft; and means for transmitting electric current to and for energizing the electric heat

Abstract: An electrically powered hand-held heating device having an electrical heating member with a sleeve member disposed thereabout for insulating the user's hand from localized heating of the heating member, a body member formed having an enlarged housing portion and a reduced neck portion. The neck portion releasably engages the heating member and the sleeve member and provides a thermal barrier between the heating member, and the enlarged housing portion while the enlarged housing portion has an electronic control circuit mounted therein for controlling the heating temperature of the heating member for various selected heating ranges.

Abstract: An improved soldering-desoldering instrument is disclosed which includes a stainless steel, thin walled sheath having a front end which is both internally and externally threaded: internally for securing the electric heater cartridge, and externally for securing the soldering tip, all in very high thermal energy flow relation. The rear of the sheath is formed integrally with a hexagonal nut to facilitate the indicated threaded assembly and disassembly.

Abstract: An electrically heated soldering device includes a housing having an elongated axis with an obtuse angle, an open end, a closed end and an intermediate opening. The outer dimensions of the housing are so dimensioned that the device can be held pencil-fashion with the portion of the housing between the open end and intermediate end grasped by the fingers and thumb of the hand with the portion of the housing between the intermediate opening and the closed end resting on the back of the hand between the thumb and index finger. An electric heating means is substantially coaxially positioned in the housing in spaced relation thereto and is provided with a soldering tip protruding out of the housing through said open end. The open end and the intermediate opening are substantially aligned to produce a chimney-like hollow space surrounding the hot parts of the heating means which carries away excess heat generated within the housing thereby maintaining the housing comfortably cool to touch.

Abstract: A hand manipulated electrically heated stylus tool for transferring insignia to an article from a ribbon or sheet having a coating on one face thereof subject to release and transfer to an article to be printed which operates on a 115 volt power supply without use of a voltage reducing transformer or temperature control means. The tool includes an aluminum mandrel with a surrounding sleeve of heat shrinkable Teflon on which a heating element of high resistance insulated wire is wound so that the sleeve provides back-up insulation between the wire and mandrel. The mandrel is provided with a bore which receives the tip portion of a conventional ball point pen, thus forming a heated stylus. The heated stylus assembly is disposed within a hollow frusto-conical support and is secured therein by a hardenable mixture forming heat insulation between the assembly and the support.

Abstract: A bonding head for connecting the electrically conductive leads of a tape cable or the like to other electrical conductors. The bonding head, which applies heat and pressure to the electrical conductors and leads to bond them together, is an elongated member comprised of a material having high mechanical strength but low thermal conductivity which contains a conduit comprised of a material having low mechanical strength but high thermal conductivity. A heating element inserted in the conduit supplies heat to the conduit and bonding head. This arrangement provides a bonding head having a high mechanical strength and hence structural failure and deformation of the bonding head is reduced.