US3716692A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Temperature controlled soldering irons
Assignee: Individual
•
Filing: 1971-02-19
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Granted: 1973-02-13
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Expires: 1991-02-19
Abstract
Abstract A temperature controlled electrical soldering iron includes a soldering tip removably secured in a nickel or nickel alloy barrel. An electric heating coil is wound around the barrel and heating current is supplied thereto through a solid state SCR temperature control circuit. The control circuit includes a nickel wire temperature sensing element wound about the barrel in axially displaced, non-overlapping relationship to the heating coil with the sensing element being in closer proximity to the soldering face of the soldering tip than the heating coil. The variation in resistance of the sensing element as the soldering tip temperature changes causes the SCR to be turned on andoff through a triggering circuit including a transistor and a silicon controlled switch.
Inventors
- 👤 A Royston
- 👤 R Schick
- 👤 R Mackie
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 20:28
CPC Classifications
B; B23; B23K; B23K3/00; B23K3/02; B23K3/03; B23K3/0338; B23K3/0353; B23K3/033; G; G05; G05D; G05D23/00; G05D23/19; G05D23/1906; G05D23/1909; G05D23/20; G05D23/24
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
244 words
An electrical soldering iron including: a barrel, a soldering tip removably secured in said barrel, an electrical heating coil wound about said barrel in electrically insulated relationship therewith to heat said barrel and said soldering tip when current flows through said coil, and an associated electrical circuit to supply a heating current to said heating coil, said barrel being composed of of a material selected from the group consisting of nickel and nickel alloy, said soldering tip being secured in close heat transferring relationship with said barrel, a nickel wire sensing element wound about said barrel and electrically insulated therefrom, said sensing element being axially displaced in non-overlapping relation from said heating coil, and said sensing element being in closer proximity to the soldering face of said soldering tip than said heating coil, and control circuit means electrically connected to the sensing element provided to open and close said electrical circuit in response to the variation in resistance of said sensing element, whereby when the soldering tip heats to the predetermined operating temperature, the resultant increase in resistance of the sensing element will cause the control circuit means to open the electrical circuit to cut off the flow of current to the heating coil and when the soldering tip cools below the predetermined operating temperature the resultant decrease in resistance of the sensing element will cause the control circuit means to close the electrical circuit to permit current to flow to the heating coil.
Claim 2
Dependent Claim
244 words
An electrical soldering iron including: a barrel, a soldering tip removably secured in said barrel, an electrical heating coil wound about said barrel in electrically insulated relationship therewith to heat said barrel and said soldering tip when current flows through said coil, and an associated electrical circuit to supply a heating current to said heating coil, said barrel being composed of of a material selected from the group consisting of nickel and nickel alloy, said soldering tip being secured in close heat transferring relationship with said barrel, a nickel wire sensing element wound about said barrel and electrically insulated therefrom, said sensing element being axially displaced in non-overlapping relation from said heating coil, and said sensing element being in closer proximity to the soldering face of said soldering tip than said heating coil, and control circuit means electrically connected to the sensing element provided to open and close said electrical circuit in response to the variation in resistance of said sensing element, whereby when the soldering tip heats to the predetermined operating temperature, the resultant increase in resistance of the sensing element will cause the control circuit means to open the electrical circuit to cut off the flow of current to the heating coil and when the soldering tip cools below the predetermined operating temperature the resultant decrease in resistance of the sensing element will cause the control circuit means to close the electrical circuit to permit current to flow to the heating coil.
Claim 3
Dependent Claim
244 words
An electrical soldering iron including: a barrel, a soldering tip removably secured in said barrel, an electrical heating coil wound about said barrel in electrically insulated relationship therewith to heat said barrel and said soldering tip when current flows through said coil, and an associated electrical circuit to supply a heating current to said heating coil, said barrel being composed of of a material selected from the group consisting of nickel and nickel alloy, said soldering tip being secured in close heat transferring relationship with said barrel, a nickel wire sensing element wound about said barrel and electrically insulated therefrom, said sensing element being axially displaced in non-overlapping relation from said heating coil, and said sensing element being in closer proximity to the soldering face of said soldering tip than said heating coil, and control circuit means electrically connected to the sensing element provided to open and close said electrical circuit in response to the variation in resistance of said sensing element, whereby when the soldering tip heats to the predetermined operating temperature, the resultant increase in resistance of the sensing element will cause the control circuit means to open the electrical circuit to cut off the flow of current to the heating coil and when the soldering tip cools below the predetermined operating temperature the resultant decrease in resistance of the sensing element will cause the control circuit means to close the electrical circuit to permit current to flow to the heating coil.
Claim 4
Dependent Claim
244 words
An electrical soldering iron including: a barrel, a soldering tip removably secured in said barrel, an electrical heating coil wound about said barrel in electrically insulated relationship therewith to heat said barrel and said soldering tip when current flows through said coil, and an associated electrical circuit to supply a heating current to said heating coil, said barrel being composed of of a material selected from the group consisting of nickel and nickel alloy, said soldering tip being secured in close heat transferring relationship with said barrel, a nickel wire sensing element wound about said barrel and electrically insulated therefrom, said sensing element being axially displaced in non-overlapping relation from said heating coil, and said sensing element being in closer proximity to the soldering face of said soldering tip than said heating coil, and control circuit means electrically connected to the sensing element provided to open and close said electrical circuit in response to the variation in resistance of said sensing element, whereby when the soldering tip heats to the predetermined operating temperature, the resultant increase in resistance of the sensing element will cause the control circuit means to open the electrical circuit to cut off the flow of current to the heating coil and when the soldering tip cools below the predetermined operating temperature the resultant decrease in resistance of the sensing element will cause the control circuit means to close the electrical circuit to permit current to flow to the heating coil.
Claim 5
Dependent Claim
47 words
A soldering iron according to claim 1, wherein the control circuit means includes manually adjustable means whereby the electrical circuit may be opened and closed at different predetermined operating temperatures thereby to permit the operating temperature of the soldering tip to be varied for different soldering operations.
Claim 6
Dependent Claim
144 words
A soldering iron according to claim 1, wherein the control circuit means comprises an electronic control circuit for detecting a variation in resistance to current flow of the sensing element with a change in temperature of the soldering tip, the control circuit including a rectifier connected in circuit with the heating coil and adapted to be triggered from a conductive state to a non-conductive state and vice versa, and a triggering circuit for triggering the rectifier from one state to the other and connected to the sensing element so that the rectifier is triggered into its non-conductive state when the resistance of the temperature sensing element increases to its value of resistance at the predetermined temperature and is triggered into its conductive state when the resistance of the temperature sensing element decreases to a value of resistance less than that at the predetermined temperature.
Claim 7
Dependent Claim
27 words
A soldering iron according to claim 3, wherein the rectifier is a silicon controlled rectifier and the triggering circuit includes a transistor and a silicon controlled switch.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-02-13 | 1976-08-14 | 1977-02-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-02-13 | 1980-08-14 | 1981-02-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-02-13 | 1984-08-14 | 1985-02-13 | $7700.00 | Window Closed / Lapsed |