GB444445A - An improved method and apparatus for the production of electric contacts - Google Patents
An improved method and apparatus for the production of electric contactsInfo
- Publication number
- GB444445A GB444445A GB13299/35A GB1329935A GB444445A GB 444445 A GB444445 A GB 444445A GB 13299/35 A GB13299/35 A GB 13299/35A GB 1329935 A GB1329935 A GB 1329935A GB 444445 A GB444445 A GB 444445A
- Authority
- GB
- United Kingdom
- Prior art keywords
- mould
- copper
- gap
- powder
- fusible metal
- 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
Links
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
- B22F3/00—Manufacture of workpieces or articles from metallic powder characterised by the manner of compacting or sintering; Apparatus specially adapted therefor ; Presses and furnaces
- B22F3/24—After-treatment of workpieces or articles
- B22F3/26—Impregnating
Landscapes
- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Mechanical Engineering (AREA)
- Manufacture Of Switches (AREA)
- Powder Metallurgy (AREA)
Abstract
444,445. Making electric switches. SIEMENS & HALSKE AKT.-GES., Siemensstadt, Berlin. May 3, 1935, No. 13299. Convention date, May 3, 1934. [Classes 83 (i) and 83 (ii)] Casting.-A switch contact of sintered tungsten or other difficultly-fusible metal powder impregnated with copper, silver or other easily fusible metal is made by filling a mould with the tungsten powder, sintering, preferably in vacuo, providing a gap in the mould and pouring the copper into the evacuated mould to fill the pores in the sintered block and said gap. The gap may be provided by removing a block of molybdenum or other material not affected by sintering temperature or by replacing a flat cover by one with a recess. The recessed cover may have surfaces to engage and hold the sintered block. To facilitate evacuating and reduce cost, a long mould may be used to cast a rod having the same crosssection as the contacts required and this is then cut up and ground. Any copper on other faces may be ground off at the same time. The tungsten powder may be mixed with a solution of camphor or other easily evaporated material so that fine-grain powder may be used or more of the fusible metal be absorbed or both to facilitate cutting up by a metal saw. Contacts made in this way can be easily soldered to their supports.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE444445X | 1934-05-03 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB444445A true GB444445A (en) | 1936-03-20 |
Family
ID=6535740
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB13299/35A Expired GB444445A (en) | 1934-05-03 | 1935-05-03 | An improved method and apparatus for the production of electric contacts |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB444445A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4910868A (en) * | 1988-02-25 | 1990-03-27 | Merlin Gerin | Manufacturing process of an electrical contact with contact pad |
-
1935
- 1935-05-03 GB GB13299/35A patent/GB444445A/en not_active Expired
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4910868A (en) * | 1988-02-25 | 1990-03-27 | Merlin Gerin | Manufacturing process of an electrical contact with contact pad |
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