US2625737A - Method of making electrical contacts - Google Patents
Method of making electrical contacts Download PDFInfo
- Publication number
- US2625737A US2625737A US181449A US18144950A US2625737A US 2625737 A US2625737 A US 2625737A US 181449 A US181449 A US 181449A US 18144950 A US18144950 A US 18144950A US 2625737 A US2625737 A US 2625737A
- Authority
- US
- United States
- Prior art keywords
- strip
- metal
- disc
- solder
- plug
- 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
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H11/00—Apparatus or processes specially adapted for the manufacture of electric switches
- H01H11/04—Apparatus or processes specially adapted for the manufacture of electric switches of switch contacts
-
- 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
- Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10S428/00—Stock material or miscellaneous articles
- Y10S428/922—Static electricity metal bleed-off metallic stock
- Y10S428/9265—Special properties
- Y10S428/929—Electrical contact feature
-
- 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
- Y10T29/49117—Conductor or circuit manufacturing
- Y10T29/49204—Contact or terminal manufacturing
- Y10T29/49208—Contact or terminal manufacturing by assembling plural parts
- Y10T29/4921—Contact or terminal manufacturing by assembling plural parts with bonding
- Y10T29/49211—Contact or terminal manufacturing by assembling plural parts with bonding of fused material
- Y10T29/49213—Metal
-
- 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
- Y10T428/00—Stock material or miscellaneous articles
- Y10T428/12—All metal or with adjacent metals
- Y10T428/12451—Macroscopically anomalous interface between layers
-
- 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
- Y10T428/00—Stock material or miscellaneous articles
- Y10T428/12—All metal or with adjacent metals
- Y10T428/12486—Laterally noncoextensive components [e.g., embedded, etc.]
-
- 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
- Y10T428/00—Stock material or miscellaneous articles
- Y10T428/12—All metal or with adjacent metals
- Y10T428/12493—Composite; i.e., plural, adjacent, spatially distinct metal components [e.g., layers, joint, etc.]
- Y10T428/12771—Transition metal-base component
- Y10T428/12861—Group VIII or IB metal-base component
- Y10T428/12868—Group IB metal-base component alternative to platinum group metal-base component [e.g., precious metal, etc.]
Definitions
- This invention relates to electrical contact elements suitable for use in the making and breaking of electric circuits and to methods for manufacturing such elements.
- the present invention provides for improvements in the methods of making contacts, and an object of this invention is to produce improved electrical contacts and to save precious metals in the manufacture thereof. Further objects and various advantages of this invention will become apparent from the following description of preferred forms, reference being made to the accompanying drawings, in which, unless otherwise indicated, corresponding elements are similarly numbered throughout the Various figures. The essential characteristics are summarized in the claims.
- Fig. 1 is a face view of a base metal strip used in fabricating contacts embodying the invention
- Fig. 2 is a side elevation of an individual plug greatly enlarged
- Fig. 3 shows the operation of punching the plug from a laminated metal strip greatly enlarged
- Fig. 4 is a face view of the die shown in Fig. 3;
- Fig. 5 is an enlarged section of a contact element drawn and cut from the strip of Fig. 1.
- a wide fiat strip I0 formed of any suitable electrically conductive base metal, e. g. copper, nickel, and so forth, or alloys thereof, such for example as brass, bronze, nickel-silver, etc.
- the strip I0 is run through a punch press which punches out a series of bores H, the location and number of the bores being dependent upon the shape and construction of the electrical contact element that is to be manufactured.
- the contact element which was chosen for illustration purposes has three precious metal contact points and accordingly there are three bores H punched in the strip Ill for each contact element to be manufactured.
- a series of locating or centering holes I2 is also punched in the strip in in a line parallel to an edge of the metal strip, the centering holes being spaced apart by a distance equal to the length of strip needed to form one contact element.
- a flat laminated metal plug IS In Fig. 2, there is shown a flat laminated metal plug IS, the shape and size of which is such that it will press fit into a bore H.
- the thickness of the plug i3 preferably approximates that of the metal strip H3.
- the plug I3 is punched out from a metal strip l4 (Fig. 3) having a film or layer a of solder on the bottom surface thereof.
- the strip It is preferably formed from a compound metal stock having a relatively thick base or foundation b of an inexpensive metal, such as, for example, that from which the metal strip H1 is formed, and a thin layer 0 of a precious metal such as gold, silver, platinum, palladium and alloys of these metals.
- the layer 0 may be electroplated on the surface of the foundation I), or the layers of metal may be integrally bonded together by direct weld with the application of heat and pressure, or by brazing or soldering, all as is well known to those skilled in the art.
- the strip 14 may consist entirely of precious metal with a film a of solder on one of its surfaces.
- the plug l3 herein shown as a disc, is punched out from the metal strip 14 by passing the strip between a die It and punch H, with the solder face a of the strip towards the dieand its precious metal face towards the punch.
- the die I6 is provided with serrations l8 around the rim of the die hole l9 (see Fig. 4). These serrations cause the solder layer a to be drawn up around the sides of the disc [3 as the disc is being punched out from the strip l4, thereby forming the scalloped edge 23 of the solder layer as is shown in Fig. 2.
- the next step in the manufacture of the electric contacts of this invention comprises fixing the discs l3 into the bores II. This may be accomplished by supporting the die I6 upon a base 2
- the die I6 is provided in its bottom surface with a recess 2
- the assembly of the strip l containing. the discs I 3 is: then heated as by passing'the stripi through a furnace at the liquidus temperature of the solder. will flow between the sides of the discs and the Walls of the base metal bore ll so that the discs I become firmly bonded into the strip.
- the finished contacts 25- (Fig; 5) are-formed v from the assembled strip byJa series of-stamping, drawing and cutting operations, the particulan sequence of these operations being immaterial.
- the finished contacts 25- (Fig; 5) are-formed v from the assembled strip byJa series of-stamping, drawing and cutting operations, the particulan sequence of these operations being immaterial.
- the finished contacts 25- (Fig; 5) are-formed v from the assembled strip byJa series of-stamping, drawing and cutting operations, the particulan sequence of these operations being immaterial.
- shortas'pro jections 26 which serve as the contact pointsrare drawn out with their precious metal layers on the outer surface of the projection.
- this invention provides a method for manufacturing an improved electricalcontact having longer wearing properties and greater corrosion resistance exactly where needed and permits of the. most.economi-- cal use-of costly noble or precious metals or alloys of these metals, since only the very point of contact is made from these metals.
- the method of making an electrical contact from a base metal strip including at. least one disc-like plug formed from a laminated stock having a precious metal top layer and a bottom layer of solder, said method comprising the steps ofinserting said plug with its bottom layer facing said strip into a hole in said strip while simultaneously causing solder to be drawn up around the sides of said disc, bonding said plug at its peripheral surfaces in said hole in the strip by heating said plug and strip assembly to a ternperature sufficient to cause said solder to bond the peripheral ides of said plug to the walls of said hole to form a completed base strip capable of being further worked, and thereafter forming a projectionin the bonded assembly including at least said plug with its precious metal layer being projected forward to serve as the contact point.
- said punching step being performed by means of a die having serrations around the rim of the die opening whereby the solder is caused to be drawn up around the sides of the disc, and inserting said disc into a perforation in a second .base metal strip, heating said disc while being carried. in said perforation. to the. liquidus temperature of said solder'so thatthe disc becomes joined to said strip at its peripheral edges, and thereafter forming a projection in said bonded assembly, the apex of said projection comprising said'disc with'said precious metal layer forming theouter surface of said projection whereby an electriccontact is. formed having the precious metal, contact material only at the point where needed.-
Landscapes
- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Manufacture Of Switches (AREA)
- Contacts (AREA)
Description
Jan. 20, 1953 H. E. SPOONER 2,625,737
METHOD OF MAKING ELECTRICAL CONTACTS Filed Aug. 25, 1950 III" E INVENTOR. HOWARD E SPOONER 19 ATTORNEY Patented Jan. 20, 1953 METHOD OF MAKING ELECTRICAL CONTACTS Howard E. Spooner, Attleboro, Mass., assignor to D. E.- Makepeace Company, Attleboro, Mass., a corporation of Massachusetts Application August 25, 1950, Serial No. 181,449
- 3 Claims.
This invention relates to electrical contact elements suitable for use in the making and breaking of electric circuits and to methods for manufacturing such elements.
Heretofore electric make-and-break contacts for applications such as voltage regulators, relays and the like have been formed from base metal strips with precious metal inserts or inlays or rivets which serve as the contact points. The precious metals have excellent current carrying capacities due to their low electrical resistance and they are highly resistant to tarnish and electrical erosion whereby electrical contacts formed from these metals have low contact surface resistance even with small contact pressures and they are capable of maintaining a low electrical resistance in service for long periods of operation.
The present invention provides for improvements in the methods of making contacts, and an object of this invention is to produce improved electrical contacts and to save precious metals in the manufacture thereof. Further objects and various advantages of this invention will become apparent from the following description of preferred forms, reference being made to the accompanying drawings, in which, unless otherwise indicated, corresponding elements are similarly numbered throughout the Various figures. The essential characteristics are summarized in the claims.
In the drawing:
Fig. 1 is a face view of a base metal strip used in fabricating contacts embodying the invention;
Fig. 2 is a side elevation of an individual plug greatly enlarged;
Fig. 3 shows the operation of punching the plug from a laminated metal strip greatly enlarged;
Fig. 4 is a face view of the die shown in Fig. 3;
Fig. 5 is an enlarged section of a contact element drawn and cut from the strip of Fig. 1.
Referring to the drawing, there is shown in Fig. 1 a wide fiat strip I0 formed of any suitable electrically conductive base metal, e. g. copper, nickel, and so forth, or alloys thereof, such for example as brass, bronze, nickel-silver, etc. The strip I0 is run through a punch press which punches out a series of bores H, the location and number of the bores being dependent upon the shape and construction of the electrical contact element that is to be manufactured. The contact element which was chosen for illustration purposes has three precious metal contact points and accordingly there are three bores H punched in the strip Ill for each contact element to be manufactured.
A series of locating or centering holes I2 is also punched in the strip in in a line parallel to an edge of the metal strip, the centering holes being spaced apart by a distance equal to the length of strip needed to form one contact element.
In Fig. 2, there is shown a flat laminated metal plug IS, the shape and size of which is such that it will press fit into a bore H. The thickness of the plug i3 preferably approximates that of the metal strip H3. The plug I3 is punched out from a metal strip l4 (Fig. 3) having a film or layer a of solder on the bottom surface thereof. The strip It is preferably formed from a compound metal stock having a relatively thick base or foundation b of an inexpensive metal, such as, for example, that from which the metal strip H1 is formed, and a thin layer 0 of a precious metal such as gold, silver, platinum, palladium and alloys of these metals. The layer 0 may be electroplated on the surface of the foundation I), or the layers of metal may be integrally bonded together by direct weld with the application of heat and pressure, or by brazing or soldering, all as is well known to those skilled in the art. Obviously, of course, the strip 14 may consist entirely of precious metal with a film a of solder on one of its surfaces.
The plug l3, herein shown as a disc, is punched out from the metal strip 14 by passing the strip between a die It and punch H, with the solder face a of the strip towards the dieand its precious metal face towards the punch. The die I6 is provided with serrations l8 around the rim of the die hole l9 (see Fig. 4). These serrations cause the solder layer a to be drawn up around the sides of the disc [3 as the disc is being punched out from the strip l4, thereby forming the scalloped edge 23 of the solder layer as is shown in Fig. 2.
With the strip l0 prepared as illustrated in Fig. 1, the next step in the manufacture of the electric contacts of this invention comprises fixing the discs l3 into the bores II. This may be accomplished by supporting the die I6 upon a base 2| and passing the flat strip I0 between the base and the die so that the discs l3 when punched from the strip M will pass through the die hole 19 and become seated in the bores II in the strip 10. In order to maintain the strip in proper relative position so that the bores H are aligned with the die hole I9, the die I6 is provided in its bottom surface with a recess 2| The assembly of the strip l containing. the discs I 3 is: then heated as by passing'the stripi through a furnace at the liquidus temperature of the solder. will flow between the sides of the discs and the Walls of the base metal bore ll so that the discs I become firmly bonded into the strip.
The finished contacts 25- (Fig; 5) are-formed v from the assembled strip byJa series of-stamping, drawing and cutting operations, the particulan sequence of these operations being immaterial. for the purposes of this inventions'o longas'pro jections 26 which serve as the contact pointsrare drawn out with their precious metal layers on the outer surface of the projection.
It is thus apparent that .this invention provides a method for manufacturing an improved electricalcontact having longer wearing properties and greater corrosion resistance exactly where needed and permits of the. most.economi-- cal use-of costly noble or precious metals or alloys of these metals, since only the very point of contact is made from these metals.
It is understood that this invention is not limited to the-specific embodiments shown and 'described-and that various deviations may be made,
therefrom without departing fromthe spirit and scope of the appended claims.
What I claim is:
1. The method of making an electrical contact from a base metal strip including at. least one disc-like plug formed from a laminated stock having a precious metal top layer and a bottom layer of solder, said method comprising the steps ofinserting said plug with its bottom layer facing said strip into a hole in said strip while simultaneously causing solder to be drawn up around the sides of said disc, bonding said plug at its peripheral surfaces in said hole in the strip by heating said plug and strip assembly to a ternperature sufficient to cause said solder to bond the peripheral ides of said plug to the walls of said hole to form a completed base strip capable of being further worked, and thereafter forming a projectionin the bonded assembly including at least said plug with its precious metal layer being projected forward to serve as the contact point.
2. The method of making an electrical contact comprising sequentially punching at least onedisc from a laminated stock having a precious metal bonded to one side of a base metal foundation layer. and a film of solder on the other side thereof with the solder film facing downwardly,
Upon being heated, melted solder? said punching step being performed by means of a die having serrations around the rim of the die opening whereby the solder is caused to be drawn up around the sides of the disc, and inserting said disc into a perforation in a second .base metal strip, heating said disc while being carried. in said perforation. to the. liquidus temperature of said solder'so thatthe disc becomes joined to said strip at its peripheral edges, and thereafter forming a projection in said bonded assembly, the apex of said projection comprising said'disc with'said precious metal layer forming theouter surface of said projection whereby an electriccontact is. formed having the precious metal, contact material only at the point where needed.-
3. The method of making electrical contacts comprisingbondinga precious metal layer to one surface of a first strip of an electrically conductive base metal, depositing a layer of solder on the other surface of. said first strip whereby. a laminated metal strip is. formed, punching a series of holes in a second strip. of. electrically conductive base metal, positioning said firststrip above said. second strip with the solderlayer facing towards said second strip, sequentially punching a disc from said first laminated strip by means of a die having serrationsaround the rim of the die opening and inserting said disc into a hole in said second stripwhereby the solderis caused to be drawn up around the sides of said disc, heating said disc and second strip assembly to a temperature sufficient tocause said solder to bond the peripheral sides of said disc to the second base strip to form a completed base strip capable of being further worked, stamping a series of blank electrical contact forms from said completed base strip each of said forms including at least one of said discs, and thereafter forming projections to serve as contact points in said electrical contact forms including at least one disc with the precious metal layer of said disc on the outer surface thereof.
HOWARD E. SPOONER.
REFERENCES CITED The following references are of record in the fileof this patent:
UNITED STATES PATENTS
Priority Applications (7)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
NL87414D NL87414C (en) | 1950-08-25 | ||
BE516778D BE516778A (en) | 1950-08-25 | ||
US181449A US2625737A (en) | 1950-08-25 | 1950-08-25 | Method of making electrical contacts |
FR1066773D FR1066773A (en) | 1950-08-25 | 1952-11-24 | Electric switch |
GB29656/52A GB717652A (en) | 1950-08-25 | 1952-11-24 | Improvements in or relating to the methods of making electrical contacts |
DEM16409A DE1117791B (en) | 1950-08-25 | 1952-11-25 | Process for the production of electrical contact pieces with disk-shaped contact inserts made of composite metal |
CH309321D CH309321A (en) | 1950-08-25 | 1952-12-02 | Process for producing an electrical contact and electrical contact produced according to this process. |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US181449A US2625737A (en) | 1950-08-25 | 1950-08-25 | Method of making electrical contacts |
Publications (1)
Publication Number | Publication Date |
---|---|
US2625737A true US2625737A (en) | 1953-01-20 |
Family
ID=22664327
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US181449A Expired - Lifetime US2625737A (en) | 1950-08-25 | 1950-08-25 | Method of making electrical contacts |
Country Status (6)
Country | Link |
---|---|
US (1) | US2625737A (en) |
BE (1) | BE516778A (en) |
CH (1) | CH309321A (en) |
FR (1) | FR1066773A (en) |
GB (1) | GB717652A (en) |
NL (1) | NL87414C (en) |
Cited By (11)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2769875A (en) * | 1953-09-25 | 1956-11-06 | Bell Telephone Labor Inc | Mercury contact switch |
US2984893A (en) * | 1958-07-15 | 1961-05-23 | Engelhard Ind Inc | Method of making an electrical contact |
US3015884A (en) * | 1957-10-16 | 1962-01-09 | Raytheon Co | Method of storing a material within another material |
US3066386A (en) * | 1958-05-07 | 1962-12-04 | Electro Tec Corp | Method of making a slip ring assembly |
US3075281A (en) * | 1958-10-03 | 1963-01-29 | Engelhard Ind Inc | Method for producing an electrical contact element |
US3192351A (en) * | 1961-05-08 | 1965-06-29 | Fansteel Metallurgical Corp | Electrical contact disc |
US3256399A (en) * | 1961-11-17 | 1966-06-14 | Robertshaw Controls Co | Vacuum operated switch structures |
US3690043A (en) * | 1968-11-25 | 1972-09-12 | Bodo Futterer | Electrofilter for gases |
US3964666A (en) * | 1975-03-31 | 1976-06-22 | Western Electric Company, Inc. | Bonding contact members to circuit boards |
US3969156A (en) * | 1975-04-23 | 1976-07-13 | Kabel-Und Metallwerke Gutehoffnungshutte Aktiengesellschaft | Method of making dispersion strengthened products |
US4294396A (en) * | 1978-07-21 | 1981-10-13 | Fuji Electric Co., Ltd. | Method for manufacturing brazed parts |
Families Citing this family (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE3108502A1 (en) * | 1979-11-28 | 1982-09-30 | Fa. Leopold Kostal, 5880 Lüdenscheid | Electrical contact-making device and a method which is suitable for producing the same |
DE2947811C2 (en) * | 1979-11-28 | 1983-06-16 | Leopold Kostal GmbH & Co KG, 5880 Lüdenscheid | Contact body |
Citations (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US1046823A (en) * | 1908-02-27 | 1912-12-10 | Western Electric Co | Electrical switch-contact. |
US2018073A (en) * | 1933-03-25 | 1935-10-22 | Eisler Electric Corp | Electrode or contact mechanism |
US2199240A (en) * | 1935-02-06 | 1940-04-30 | Mallory & Co Inc P R | Silver faced contact |
US2216510A (en) * | 1938-08-16 | 1940-10-01 | Wilson H A Co | Method of making contacts |
US2254558A (en) * | 1938-10-10 | 1941-09-02 | Ivan A Williams | Fastening element and method of making same |
US2373861A (en) * | 1942-10-08 | 1945-04-17 | Bell Telephone Labor Inc | Method of making contact wiper springs |
US2414463A (en) * | 1943-09-10 | 1947-01-21 | Metals & Controls Corp | Electrical contact |
-
0
- NL NL87414D patent/NL87414C/xx active
- BE BE516778D patent/BE516778A/fr unknown
-
1950
- 1950-08-25 US US181449A patent/US2625737A/en not_active Expired - Lifetime
-
1952
- 1952-11-24 GB GB29656/52A patent/GB717652A/en not_active Expired
- 1952-11-24 FR FR1066773D patent/FR1066773A/en not_active Expired
- 1952-12-02 CH CH309321D patent/CH309321A/en unknown
Patent Citations (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US1046823A (en) * | 1908-02-27 | 1912-12-10 | Western Electric Co | Electrical switch-contact. |
US2018073A (en) * | 1933-03-25 | 1935-10-22 | Eisler Electric Corp | Electrode or contact mechanism |
US2199240A (en) * | 1935-02-06 | 1940-04-30 | Mallory & Co Inc P R | Silver faced contact |
US2216510A (en) * | 1938-08-16 | 1940-10-01 | Wilson H A Co | Method of making contacts |
US2254558A (en) * | 1938-10-10 | 1941-09-02 | Ivan A Williams | Fastening element and method of making same |
US2373861A (en) * | 1942-10-08 | 1945-04-17 | Bell Telephone Labor Inc | Method of making contact wiper springs |
US2414463A (en) * | 1943-09-10 | 1947-01-21 | Metals & Controls Corp | Electrical contact |
Cited By (11)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2769875A (en) * | 1953-09-25 | 1956-11-06 | Bell Telephone Labor Inc | Mercury contact switch |
US3015884A (en) * | 1957-10-16 | 1962-01-09 | Raytheon Co | Method of storing a material within another material |
US3066386A (en) * | 1958-05-07 | 1962-12-04 | Electro Tec Corp | Method of making a slip ring assembly |
US2984893A (en) * | 1958-07-15 | 1961-05-23 | Engelhard Ind Inc | Method of making an electrical contact |
US3075281A (en) * | 1958-10-03 | 1963-01-29 | Engelhard Ind Inc | Method for producing an electrical contact element |
US3192351A (en) * | 1961-05-08 | 1965-06-29 | Fansteel Metallurgical Corp | Electrical contact disc |
US3256399A (en) * | 1961-11-17 | 1966-06-14 | Robertshaw Controls Co | Vacuum operated switch structures |
US3690043A (en) * | 1968-11-25 | 1972-09-12 | Bodo Futterer | Electrofilter for gases |
US3964666A (en) * | 1975-03-31 | 1976-06-22 | Western Electric Company, Inc. | Bonding contact members to circuit boards |
US3969156A (en) * | 1975-04-23 | 1976-07-13 | Kabel-Und Metallwerke Gutehoffnungshutte Aktiengesellschaft | Method of making dispersion strengthened products |
US4294396A (en) * | 1978-07-21 | 1981-10-13 | Fuji Electric Co., Ltd. | Method for manufacturing brazed parts |
Also Published As
Publication number | Publication date |
---|---|
BE516778A (en) | |
FR1066773A (en) | 1954-06-09 |
GB717652A (en) | 1954-10-27 |
NL87414C (en) | |
CH309321A (en) | 1955-08-31 |
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