US2665364A - Electrically heated tool - Google Patents
Electrically heated tool Download PDFInfo
- Publication number
- US2665364A US2665364A US221170A US22117051A US2665364A US 2665364 A US2665364 A US 2665364A US 221170 A US221170 A US 221170A US 22117051 A US22117051 A US 22117051A US 2665364 A US2665364 A US 2665364A
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- US
- United States
- Prior art keywords
- socket
- resistor
- electrically heated
- tool
- construction
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
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Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K3/00—Tools, devices, or special appurtenances for soldering, e.g. brazing, or unsoldering, not specially adapted for particular methods
- B23K3/04—Heating appliances
- B23K3/047—Heating appliances electric
- B23K3/053—Heating appliances electric using resistance wires
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T29/00—Metal working
- Y10T29/49—Method of mechanical manufacture
- Y10T29/49002—Electrical device making
- Y10T29/49082—Resistor making
- Y10T29/49083—Heater type
Definitions
- FIGJ. 1 A first figure.
- the invention relates to electrically heated tools of that type in which the shank of the tool proper engages a socket member which is surrounded by an electrical heating unit, which in turn is surrounded by an outer casing connected to a handle.
- an electrical heating unit which in turn is surrounded by an outer casing connected to a handle.
- the leakage is cumulative and may be sufficient to be highly objectionable.
- the leakage is proportional to the extent of area of the electrically charged element in contact with the insulator sheet and the conductive element on the opposite side thereof.
- Fig. 1 is a central longitudinal section partly in elevation through the socket member and the heating element of an electrically heated tool
- Fig. 2 is a cross section thereof
- Fig. 3 is an enlarged portion of Fig. 2 showing the welded joint of the wrapper.
- A is a cylindrical socket member adapted to receive the shank of a soldering iron tip (not shown).
- This socket is provided at its forward and rear ends with head portions, respectively, B and C between which is arranged an electrical heating unit D and with an outer casing E surrounding said unit and heads.
- the heating unit is formed by a mica insulator sheet F wound about the outer surface of the cylinder with a resistor element G, preferably a ribbon helically wound upon the insulation in one or a plurality of layers also insulated by mica sheets.
- a socket for receiving the shank of the tool proper and having radially extending heads at opposite ends thereof, an electrical heating unit surrounding said socket between and spaced from said heads, sheet mica insulating material for said unit extending the full distance between said heads,
- the heating unit is formed in a plurality of layers, each having inner and outer mica sheet insulation, and a helically wound resistor element therebetween, all of said layers being clamped and pressed radially against said socket by said wrapper and retained by the weld.
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Resistance Heating (AREA)
Description
Jan. 5, 1954 L. H. THOMAS ELECTRICALLY HEATED TOOL Filed April 16, 195].
FIGJ.
FIG
FIG
INVENTOR. LAURENCE H .THOMAS zmzal W /M ATTORNEYS Patented Jan. 5, 1 954 2,665,364 ELECTRICALLY HEATED TOOL Laurence H. Thomas, Birmingham, Mich., as-
signor to American Electrical Heater Company, Detroit, Mich., a corporation of Michigan Application April 16, 1951, Serial No. 221,170
2 Claims.
The invention relates to electrically heated tools of that type in which the shank of the tool proper engages a socket member which is surrounded by an electrical heating unit, which in turn is surrounded by an outer casing connected to a handle. It is usual in the construction of the electrical heating units to employ mica as an insulating material for the resistor element which is arranged between the same and the socket and externally bet-ween the resistor and the outer casing. Mica while having high dielectric properties in a cold state becomes slightly conductive when heated to the temperature of the resistor, so that there is a. small current leakage (in milliamperes) between the resistor and the tool. Where, as is sometimes the case, a number of tools are simultaneously operating upon the same work, the leakage is cumulative and may be sufficient to be highly objectionable. In each tool the leakage is proportional to the extent of area of the electrically charged element in contact with the insulator sheet and the conductive element on the opposite side thereof. Thus it is not only the leakage between the resistor and the socket member within the same but also the external leakage between the resistor and the member for clamping the unit to the socket, which latter as usually constructed is electrically connected to the tool.
It is the object of the invention to obtain a construction which minimizes the amount of current leakage between the heating element and the tool while in operation.
It is a further object to obtain a construction in which the unit is firmly clamped to the socket by means easily applied and which is disconnected electrically from any other portion of the structure.
With these objects in view the invention consists in the construction as hereinafter set forth.
In the drawings:
Fig. 1 is a central longitudinal section partly in elevation through the socket member and the heating element of an electrically heated tool;
Fig. 2 is a cross section thereof; and
Fig. 3 is an enlarged portion of Fig. 2 showing the welded joint of the wrapper.
While my improved construction of tool may be used for any purpose, I will specifically illustrate and describe the same as intended for use as a soldering iron. As shown A is a cylindrical socket member adapted to receive the shank of a soldering iron tip (not shown). This socket is provided at its forward and rear ends with head portions, respectively, B and C between which is arranged an electrical heating unit D and with an outer casing E surrounding said unit and heads. As above stated the heating unit is formed by a mica insulator sheet F wound about the outer surface of the cylinder with a resistor element G, preferably a ribbon helically wound upon the insulation in one or a plurality of layers also insulated by mica sheets. It is desirable to bind the element firmly against the socket for good thermal conductivity, and this has sometimes been accomplished by winding wire around the outer insulating sheet and securing the ends thereof to the heads. With such a construction current leakage will occur not only between the resistor and the socket within the same but also between the resistor and the sur rounding clamping means, so that the total volume of leakage is substantially double that directly between the resistor and the socket. Furthermore this method of securing the unit to the socket is one involving considerable labor and expense.
To simplify the construction, reduce the cost of manufacture and eliminate this double leakage I have devised the following construction. After winding the resistor upon the mica cover of the socket in one or a plurality of layers, an outer sheet of mica insulation H is wound about these layers. Upon this is placed a wrapper I of sheet metal and preferably of a non-corrodable material such as stainless steel. The wrapper is formed from a blank of suificient length so that when bent into annular form its longitudinal edges will slightly overlap each other when the wrapper is tightly Wound to apply radial coming the wrapper is less than that of the usual The heating unit is provided with suitable electrical connections to the resistor extending to the handle and the flexible service conductors, but as these form no part of the instant construction they are not illustrated. I have, however, shown an insulator block K secured in a recess in the rear head C and through which the electrical terminals'pass.
What I claim as my invention is:
1. In an electrically heated tool, a socket for receiving the shank of the tool proper and having radially extending heads at opposite ends thereof, an electrical heating unit surrounding said socket between and spaced from said heads, sheet mica insulating material for said unit extending the full distance between said heads,
' a sheet metal wrapper of substantially the length of said sheet insulating material surrounding and clamping said unit on said socket, the opposite axially extending edge portions thereof being welded to each other and the ends spaced slightly 4 from said heads, and an external casing mounted on said heads spaced from said wrapper to be insulated therefrom.
2. The construction as in claim 1 in which the heating unit is formed in a plurality of layers, each having inner and outer mica sheet insulation, and a helically wound resistor element therebetween, all of said layers being clamped and pressed radially against said socket by said wrapper and retained by the weld.
LAURENCE H. THOMAS.
References Cited in the file of this patent UNITED STATES PATENTS Number Name Date 929,473 Nilsson July 27, 1909 1,713,845 Lockwood May 21, 1929 2,213,438 Young Sept. 3, 1940 2,437,747 Kuhn et al Mar. 16, 1948
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US221170A US2665364A (en) | 1951-04-16 | 1951-04-16 | Electrically heated tool |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US221170A US2665364A (en) | 1951-04-16 | 1951-04-16 | Electrically heated tool |
Publications (1)
Publication Number | Publication Date |
---|---|
US2665364A true US2665364A (en) | 1954-01-05 |
Family
ID=22826656
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US221170A Expired - Lifetime US2665364A (en) | 1951-04-16 | 1951-04-16 | Electrically heated tool |
Country Status (1)
Country | Link |
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US (1) | US2665364A (en) |
Cited By (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE1128578B (en) * | 1958-05-14 | 1962-04-26 | Ernst Sachs Erste Spezialfabri | Insulated electrical soldering iron |
US3275803A (en) * | 1964-02-06 | 1966-09-27 | Cecil W True | Pipe heating apparatus |
US3429034A (en) * | 1963-12-18 | 1969-02-25 | Monsanto Co | Heated roll method |
US5434388A (en) * | 1992-10-07 | 1995-07-18 | E.G.O. Elektro-Gerate Blanc U. Fischer | Electrical heater for media, particularly flow heater |
US20090154909A1 (en) * | 2005-10-06 | 2009-06-18 | Pascal Meyer | Liquid-heating device for electric household appliance |
US20110286728A1 (en) * | 2010-05-24 | 2011-11-24 | Xiotin Industry Ltd. | Heater and electric instant water heater |
US20220271694A1 (en) * | 2021-02-10 | 2022-08-25 | Alliance North America, Inc. | Resistive load bank systems |
Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US929473A (en) * | 1908-01-13 | 1909-07-27 | Johan Ludvig Nilsson | Soldering-tool. |
US1713845A (en) * | 1926-11-22 | 1929-05-21 | American Electrical Heater Co | Electric soldering iron |
US2213438A (en) * | 1938-11-08 | 1940-09-03 | Leonard P Young | Soldering iron construction |
US2437747A (en) * | 1942-05-04 | 1948-03-16 | American Electrical Heater Co | Electrically heated tool |
-
1951
- 1951-04-16 US US221170A patent/US2665364A/en not_active Expired - Lifetime
Patent Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US929473A (en) * | 1908-01-13 | 1909-07-27 | Johan Ludvig Nilsson | Soldering-tool. |
US1713845A (en) * | 1926-11-22 | 1929-05-21 | American Electrical Heater Co | Electric soldering iron |
US2213438A (en) * | 1938-11-08 | 1940-09-03 | Leonard P Young | Soldering iron construction |
US2437747A (en) * | 1942-05-04 | 1948-03-16 | American Electrical Heater Co | Electrically heated tool |
Cited By (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE1128578B (en) * | 1958-05-14 | 1962-04-26 | Ernst Sachs Erste Spezialfabri | Insulated electrical soldering iron |
US3429034A (en) * | 1963-12-18 | 1969-02-25 | Monsanto Co | Heated roll method |
US3275803A (en) * | 1964-02-06 | 1966-09-27 | Cecil W True | Pipe heating apparatus |
US5434388A (en) * | 1992-10-07 | 1995-07-18 | E.G.O. Elektro-Gerate Blanc U. Fischer | Electrical heater for media, particularly flow heater |
US20090154909A1 (en) * | 2005-10-06 | 2009-06-18 | Pascal Meyer | Liquid-heating device for electric household appliance |
US20110286728A1 (en) * | 2010-05-24 | 2011-11-24 | Xiotin Industry Ltd. | Heater and electric instant water heater |
US20220271694A1 (en) * | 2021-02-10 | 2022-08-25 | Alliance North America, Inc. | Resistive load bank systems |
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