US1747649A - Method of making a resistance element - Google Patents
Method of making a resistance element Download PDFInfo
- Publication number
- US1747649A US1747649A US330608A US33060829A US1747649A US 1747649 A US1747649 A US 1747649A US 330608 A US330608 A US 330608A US 33060829 A US33060829 A US 33060829A US 1747649 A US1747649 A US 1747649A
- Authority
- US
- United States
- Prior art keywords
- coating
- resistance element
- making
- resistance
- pressure
- 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
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01C—RESISTORS
- H01C10/00—Adjustable resistors
- H01C10/10—Adjustable resistors adjustable by mechanical pressure or force
- H01C10/106—Adjustable resistors adjustable by mechanical pressure or force on resistive material dispersed in an elastic material
Definitions
- This invention relates to a method of making a resistance element and more particularly it relates to a method of applying a resistance coating upon the surface of a conductive member of a resistance device employing surface pressure changes for current control.
- the object of the invention is the provision of a resistance element for controlling current between a low minimum and a relatively high maximum value in accordance with pressure variations between the elements.
- the preferred coating consists of a mixture of gas carbon, and an inorganic binder applied to a thoroughly cms'ifface. After drying, the metal disc with its coating is subjected to a temperature of approximately 500 C. and then passed between rollers com ressing the coating and reducing its thic mess, and producing a smooth surface of uniform thickness.
- a preferred mixture is as carbon with 30% silicate. Such a coat- 1%g Has Been found to have greater negative pressure resistance than that of a graphite coating or of the carbon discs.
- C represents the carbon coating mixture applied to opposite surfaces of the aluminum plate P.
Description
Feb. 18, 1 930. -s. RUBEN I v 1,747,649
METHOD OF MAKING A RESISTANCE ELEMENT Filed Jan. 5, 1929 aubentoz M/VUE L RUBEN 35 M au Patented Feb. 18, 1930 UNITED STATES SAMUEL RUBEN, OF NEW YORK, N. Y., ASSIGNOR TO RUBEN PATENTS COMPANY, OF
I NEW YORK, N. Y., A CORPORATION OF DELAWARE METHOD OF MARIN G A RESISTANCE ELEMENT Application filed January 5, 1929. Serial No. 330,608.
This invention relates to a method of making a resistance element and more particularly it relates to a method of applying a resistance coating upon the surface of a conductive member of a resistance device employing surface pressure changes for current control.
The object of the invention is the provision of a resistance element for controlling current between a low minimum and a relatively high maximum value in accordance with pressure variations between the elements.
It is old in the art to employ a carbon disc as the resistance element between conductive plates in a variable pressure resistance device, in the use of which various disadvantages exist, such as fragility and the relatively hi h resistance at maximum pressure, due to tie necessary thickness of the disc material.
I have found that highly satisfactory results are obtained in varlable pressure resistance devices in which relatively high temperatures develop, by employing as the resistance element a mixture of gas carbon and a suitable inorganic binder apphedas'a coating upon conductive pllites, such as iron or aluminum, which is then dried and heated to effect partial volatilization of the binder, leaving a hard substance, and thereafter compressed. In this way is obtained the desired even distribution of a durable, adherent compressed coating which has a hard, smooth surface, insurin evenly distributed surface contact with a li e coating upon another conductive plate or directly with such a plate, thereby preventing current localization. The thickness of the coating is determined by the energy to be applied. In a device employing a metal coating so produced the'resistance value at maximum pressure is very low, due to the metal base and the thin layer of the resistance material.
The preferred coating consists of a mixture of gas carbon, and an inorganic binder applied to a thoroughly cms'ifface. After drying, the metal disc with its coating is subjected to a temperature of approximately 500 C. and then passed between rollers com ressing the coating and reducing its thic mess, and producing a smooth surface of uniform thickness. A preferred mixture is as carbon with 30% silicate. Such a coat- 1%g Has Been found to have greater negative pressure resistance than that of a graphite coating or of the carbon discs.
For a better understanding of the invention reference is made to the accompanying drawings which illustrate one embodiment of the invention. In Figs. 1 and 2, C represents the carbon coating mixture applied to opposite surfaces of the aluminum plate P.
\Vhat I claim is: v
1. The method of making an element for a pressure controlled rheostat, which consists inapplying to the surface of a conductive body a mixture containing gas carbon and an inorganic binder, drying the coating, heating it to approximately 500 C. and passing the coated body between compression rollers.
2. The method of making a resistance element for a pressure controlled rheostat, which consists in applying to the surface of a metallic body a layer of gas carbon mixed with an inorganic binder, partiall volatilizing the binder and compressing tie coated element so as to produce a uniformly distributed layer of the resistance metal. 7
3. The method of making a resistance element for a pressure controlled rheostat, which consists in coating the surface of a conductive bod with a mixture containing gas carbon an a silicate and heating the coating until a partial volatilization of the silicate occurs, and compressing the coating.
4. The method of making a resistance element for a pressure controlled rheostat which consists in coating the surface of a conductive body with a mixture containing 70% gas carbon and 30% silicate heating the coating until a partial volatilization of the silicate occurs and compressing the coating.
In testimony whereof SAMUEL RUBEN has signed his name to this specification this 27th day of December, 1928.
. SAMUEL RUBEN.
who?
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US330608A US1747649A (en) | 1929-01-05 | 1929-01-05 | Method of making a resistance element |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US330608A US1747649A (en) | 1929-01-05 | 1929-01-05 | Method of making a resistance element |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| US1747649A true US1747649A (en) | 1930-02-18 |
Family
ID=23290507
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| US330608A Expired - Lifetime US1747649A (en) | 1929-01-05 | 1929-01-05 | Method of making a resistance element |
Country Status (1)
| Country | Link |
|---|---|
| US (1) | US1747649A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3060303A (en) * | 1958-07-29 | 1962-10-23 | George A Skoglund | Heating element |
| US3711428A (en) * | 1971-02-01 | 1973-01-16 | Ibm | Electrical resistor paste containing a small amount of charcoal |
-
1929
- 1929-01-05 US US330608A patent/US1747649A/en not_active Expired - Lifetime
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3060303A (en) * | 1958-07-29 | 1962-10-23 | George A Skoglund | Heating element |
| US3711428A (en) * | 1971-02-01 | 1973-01-16 | Ibm | Electrical resistor paste containing a small amount of charcoal |
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