US1279321A - Electrically-heated soldering-iron. - Google Patents

Electrically-heated soldering-iron. Download PDF

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Publication number
US1279321A
US1279321A US7295916A US7295916A US1279321A US 1279321 A US1279321 A US 1279321A US 7295916 A US7295916 A US 7295916A US 7295916 A US7295916 A US 7295916A US 1279321 A US1279321 A US 1279321A
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section
iron
spool
electrically
wire
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US7295916A
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Benjamin Fulton Gardner
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SEYMOUR STEDMAN
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SEYMOUR STEDMAN
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    • BPERFORMING OPERATIONS; TRANSPORTING
    • B23MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23KSOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
    • B23K3/00Tools, devices, or special appurtenances for soldering, e.g. brazing, or unsoldering, not specially adapted for particular methods
    • B23K3/02Soldering irons; Bits
    • B23K3/03Soldering irons; Bits electrically heated
    • B23K3/0376Soldering irons; Bits electrically heated comprising carbon heating elements or electrodes

Definitions

  • My invention relates to improvements in electric heating devices. More particularly the present invention is concerned with the construction of the resistor or heating ele ments per se.
  • Theobject of the invention is to provide an improved element ofa com pound nature, embodying two conductors connected in series, the one having a positive temperature coeliicient and the other a negative temperature coeiicient, whereby an accurate automatic regulation of the heat developed is obtained.
  • the invention is to provide such a device in a convenient form capable of being readily incorporated in the structure of a heating device suchk as an electric soldering iron.
  • the soldering iron shown comprises a tubular handle ysection 10 having a grip pori .tion 11 on its outer end and attached at its other end to an open-endedcylindrical metallic she-ll 12.
  • a sleeve 13 of mica or other heat-resisting insulating material lines the shell 12, and within this liner the heating element. proper is housed.
  • this element is generally cylindrical in form, comprising an upper section 14 and a lower section 15, of the same external diameter and each having a central aperture through which passes a tie-rod 16 'for binding the sections together.
  • tie-rod is threaded into a shouldered disk 17 which seats upon the upper end of the metallicl annular end-plates 18 of the section 14, and at the lowerend a nut 19 is screwed upon the rod and bears against an A further object of insulating washer 20, the two sections being thus locked together end to end.
  • the section 14 is preferably constructed of some suitable. heat-resisting high-resistance conducting material having a negative temperature coefficient, such for instance as carbon or .any of the well known refractory earth compositions having the necessary properties.
  • This material is formed into a centrally bored cylinder as shown, capped by the end plates 18, and preferably having an insulating tube 21 in its bore.
  • 'Ihe section 15 is preferably formed as a spool of wire such as iron or iron alloy7 having a positive temperature coelicient, the inner end of the wire being grounded to one of a pair of metallic end plates Q2, which bears against and contacts with the plate 18 of the section 14, while lthe outer end is left free for the attachment of one of thecurrent-supplying wires. As shown in Fig.
  • the wire is preferably wound upon the spool with alternate layers of insulating material such as mica, and with a hollow core registering with the tube 21.
  • the complete heating element is mounted within the shell 12 as shown in Fig. 1, ⁇ the section 14 being at the 'outer end, and a duplex cable Q3 is led in through the'hollow handle 10 to supply current to the heater, one terminal of the cable being attached to the-outer end of the spool winding and the other terminal to the inner end of the rod 16.
  • a soldering iron tip 24 is Specification of Letters latent. ⁇ Patented Sept. 17, 1918.
  • the cable Q3 will be connected with a source of electrical energy of the desired potential, and the current will then How through the length of iron wire upon the spool 15. to end plate 22 from the inner end of this wire, thence by direct contact to the end plate 18 of the section 14, through the length of the latter to the yupper end plate 18 and disk 17, and down'the tie-rod 16, thence back to the 'cable 23.
  • the heating device is cold the wire upon the spool 15 will have. a relatively low resistance, while the section 14 will have a relatively high resistance.
  • each of the sections therefore acts as a governor, controller or counterbalance for the other, causing the device as a whole to heat up quickly to the desired temperature, drawing a substantially constant current during the entire heating-up period, and then automatically maintaining this current iiow and temperature thereafter.
  • a further important advantage of the construction lies in the fact that small variations in the impressed electro-motive force do not effect more than proportionate variations in the current drawn or the temperature developed. Thus commercial service lines in various localities may range from 110 to 120 volts for instance.
  • the heater may be properly designed for ll volts and the variation of 5 volts on either side of this standard will have no noticeable effect, the positive temperature coeiicient of the spool preventing any large increase in current which the negative coefficient of the tubular section would tend to cause with increased voltage, and likewise preventing the great drop of current which a small drop in volt-- age will eiect in the tubular section.
  • the section 14 will be designed to develop a considerably greater quantity of heat than the spool l5, the principal function of the latter being that of a regulator and its heating eiect being a secondary reinforcement of the eiiect ,of the primary heater la.

Description

B. F. GARDNER. ELECTRICALLYHEATED SOLDERING IRON.
APPLICATION FILED JAN.19. 1916.
Patented Sept. Y17, 1918.
Z. fwd
' UNITED sra'ins PATENT onnroa.
BENJAMIN FULTON GARDNER, OF CHICAGO, ILLINOIS, ASSIGNOR OF ONE-HALF TO SEYMOUR STEDMAN, OF CHICAGO, ILLINOIS.
ELECTRICALLY-HEAIED SOLDERING-IRON.
Application filed January 19, 1916. Serial No. 72,959.
To @ZZ whom t may concern.'
Be it known that I, BENJAMIN FULTON GRDNER, a citizen of the United States, residing at Chicago, in the county of Cook and State of Illinois, have invented a new and useful Electrically-Heated Solderin Iron, of which the following is a speci cation.
My invention relates to improvements in electric heating devices. More particularly the present invention is concerned with the construction of the resistor or heating ele ments per se. Theobject of the invention is to provide an improved element ofa com pound nature, embodying two conductors connected in series, the one having a positive temperature coeliicient and the other a negative temperature coeiicient, whereby an accurate automatic regulation of the heat developed is obtained. the invention is to provide such a device in a convenient form capable of being readily incorporated in the structure of a heating device suchk as an electric soldering iron.
Other objects and advantages of the invention will appear from the following detailed description of a soldering iron embodying the invention. In this description reference will,` be had to the accompanying drawings, in which- Figure 1 is a longitudinal sectional View of a soldering iron showing my improved heater mounted therein; Fig. 2 is an enlarged longitudinal section through the com-4 pound heating element per se and Fig. 3 is a section on the line 3 of Fig. 2.
The soldering iron shown comprises a tubular handle ysection 10 having a grip pori .tion 11 on its outer end and attached at its other end to an open-endedcylindrical metallic she-ll 12. A sleeve 13 of mica or other heat-resisting insulating material lines the shell 12, and within this liner the heating element. proper is housed. As shown in Fig. 2, this element is generally cylindrical in form, comprising an upper section 14 and a lower section 15, of the same external diameter and each having a central aperture through which passes a tie-rod 16 'for binding the sections together. At the upper end the tie-rod is threaded into a shouldered disk 17 which seats upon the upper end of the metallicl annular end-plates 18 of the section 14, and at the lowerend a nut 19 is screwed upon the rod and bears against an A further object of insulating washer 20, the two sections being thus locked together end to end.
The section 14 is preferably constructed of some suitable. heat-resisting high-resistance conducting material having a negative temperature coefficient, such for instance as carbon or .any of the well known refractory earth compositions having the necessary properties. This material is formed into a centrally bored cylinder as shown, capped by the end plates 18, and preferably having an insulating tube 21 in its bore. 'Ihe section 15 is preferably formed as a spool of wire such as iron or iron alloy7 having a positive temperature coelicient, the inner end of the wire being grounded to one of a pair of metallic end plates Q2, which bears against and contacts with the plate 18 of the section 14, while lthe outer end is left free for the attachment of one of thecurrent-supplying wires. As shown in Fig. 2, the wire is preferably wound upon the spool with alternate layers of insulating material such as mica, and with a hollow core registering with the tube 21. The complete heating element is mounted within the shell 12 as shown in Fig. 1,` the section 14 being at the 'outer end, and a duplex cable Q3 is led in through the'hollow handle 10 to supply current to the heater, one terminal of the cable being attached to the-outer end of the spool winding and the other terminal to the inner end of the rod 16. A soldering iron tip 24 is Specification of Letters latent.` Patented Sept. 17, 1918.
secured in the open outer end of the shell `Vanda mica disk 25 is interposed between its base and the face of the disk 17.
The operation of my device is as follows:
Assuming that the heating element is cold, the cable Q3 will be connected with a source of electrical energy of the desired potential, and the current will then How through the length of iron wire upon the spool 15. to end plate 22 from the inner end of this wire, thence by direct contact to the end plate 18 of the section 14, through the length of the latter to the yupper end plate 18 and disk 17, and down'the tie-rod 16, thence back to the 'cable 23. lVhen the heating device is cold the wire upon the spool 15 will have. a relatively low resistance, while the section 14 will have a relatively high resistance. As the two sections become heated the resistance of the spool becomes greater in proportion to its positive temperature coetiicient` while the resistance of the tubular resistor 14 grows less in proportion to its negative temperature coeiicient. Each of the sections therefore acts as a governor, controller or counterbalance for the other, causing the device as a whole to heat up quickly to the desired temperature, drawing a substantially constant current during the entire heating-up period, and then automatically maintaining this current iiow and temperature thereafter. A further important advantage of the construction lies in the fact that small variations in the impressed electro-motive force do not effect more than proportionate variations in the current drawn or the temperature developed. Thus commercial service lines in various localities may range from 110 to 120 volts for instance. The heater may be properly designed for ll volts and the variation of 5 volts on either side of this standard will have no noticeable effect, the positive temperature coeiicient of the spool preventing any large increase in current which the negative coefficient of the tubular section would tend to cause with increased voltage, and likewise preventing the great drop of current which a small drop in volt-- age will eiect in the tubular section. Ordinarily the section 14 will be designed to develop a considerably greater quantity of heat than the spool l5, the principal function of the latter being that of a regulator and its heating eiect being a secondary reinforcement of the eiiect ,of the primary heater la.
In the assembly shown in Fig. l the heat developed by the heating element will reach the tip Q4 by the direct contact of the base of the latter with the heater, and also by conduction from the shell l2. The arrangement here shown is simple and durable and therefore peculiarly adapted to the demands of ordinary shop conditions.
lVhile I have shown and described in considerable detail one specific embodiment of my heating element and of a device in which l the same is incorporated, it is to be understood that this showing and description is illustrative only and for the purpose of making my invention more clear and I do '2. The combination with a tubular heating element of resistance material having a negative temperature coefiicient, a hollow spool of wire in series therewith and abutting the same, and having a positive temperature coeiiicient, and a tie rod extending through the registering bores of the two members and serving as a conductor for carelement.
3. The combination with a shell of a tip to be heated secured in the outer end of the said shell, a cylindrical section of resistance material having a negative temperature coeticient abutting the said tip, and a coil of wire in series with the said section, abutting the opposite end of the same, and having a positive temperature coefficient.
4. The combination with a shell of a tip to be heated secured in the outer end of the said shell, a t-ubular section of resistance material having a negative temperature coeicient abutting the said tip, a hollow spool of wire arranged in series with the said section and abutting the opposite end ot the same, and a tie rod extending through the registering bores of the two members and having electrical connection with the tip end of the said section.
BENJAMIN FULTON GARDNER.
In presence o A. C. FISCHER, C. C. Ranma.
rying current from the outer end of the said v
US7295916A 1916-01-19 1916-01-19 Electrically-heated soldering-iron. Expired - Lifetime US1279321A (en)

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Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2562791A (en) * 1948-05-25 1951-07-31 Imobersteg Werner Small soldering iron
US2667561A (en) * 1952-04-03 1954-01-26 Wall Mfg Company P Electric soldering iron
US3023295A (en) * 1958-07-30 1962-02-27 Hexacon Electric Company Electric soldering iron of the instant heat type
US3287680A (en) * 1963-06-18 1966-11-22 Automatic Timing & Controls Electrical device
US4045763A (en) * 1974-11-20 1977-08-30 Matsushita Electric Industrial Co., Ltd. Sealed thermostatic heater
WO1982001248A1 (en) * 1980-09-26 1982-04-15 Corp Hetra Method of and apparatus for nondestructively determining the composition of an unknown material sample
US5430427A (en) * 1993-01-22 1995-07-04 Therm-O-Disc, Incorporated NTC sensor rod for glass cooktops

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2562791A (en) * 1948-05-25 1951-07-31 Imobersteg Werner Small soldering iron
US2667561A (en) * 1952-04-03 1954-01-26 Wall Mfg Company P Electric soldering iron
US3023295A (en) * 1958-07-30 1962-02-27 Hexacon Electric Company Electric soldering iron of the instant heat type
US3287680A (en) * 1963-06-18 1966-11-22 Automatic Timing & Controls Electrical device
US4045763A (en) * 1974-11-20 1977-08-30 Matsushita Electric Industrial Co., Ltd. Sealed thermostatic heater
WO1982001248A1 (en) * 1980-09-26 1982-04-15 Corp Hetra Method of and apparatus for nondestructively determining the composition of an unknown material sample
US5430427A (en) * 1993-01-22 1995-07-04 Therm-O-Disc, Incorporated NTC sensor rod for glass cooktops

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