Claims
- 1. A contact configuration for vacuum switches, comprising:
- a pair of confronting contact pieces having a circular base with radius R.sub.K, each contact piece having a center, an outer perimeter and a central circular recess defining an inner perimeter of said contact piece;
- each of said contact pieces having three to six individual slots extending from said inner perimeter of said contact piece to said outer perimeter of said contact piece, forming a spiral-type contact;
- said slots having contours with a variable and increasing radius of curvature and being described by a radius r depending on an angle .psi. in a polar coordinate system with an origin coinciding with said center of said contact pieces;
- said slots having a length in radian measure between 5/12 and 2/3 .pi. in relation to the outer perimeter of said contact piece, each of said individual slots forming an angle .psi.>.pi./3 with the inner perimeter of said contact piece.
- 2. The contact configuration according to claim 1, wherein said slots end at said recess wherein R.sub.I =(0.25 . . . 0.33) R.sub.K, where R.sub.K is a predetermined radius of said contact piece and R.sub.I is a predetermined radius of said recess defining said inner perimeter of said contact piece.
- 3. The contact configuration according to claim 2, wherein said slots end in circular bores in front of said recess defining said inner perimeter of said contact piece.
- 4. The contact configuration according to claim 1, wherein R.sub.I .ltoreq.r(.psi.).ltoreq.R.sub.K, where r(.psi.) is said radius of said slot contours in a polar coordinate system, R.sub.K is said predetermined radius of said (switch parts) contact piece and R.sub.1 is said predetermined radius of said recess defining the inner perimeter of said contact piece.
- 5. The contact configuration according to claim 4, wherein said slot contour is described by the following relation:
- r(.psi.)=R.sub.I +(R.sub.K -R.sub.I)* ##EQU19## where 0.01<a.sub.1 <2 and 0.15<f.sub.1 <0.6,
- with a.sub.1 being a shape factor, f.sub.1 being an exponent for influencing said slot contour, R.sub.K being the radius of said outer perimeter and R.sub.I being the radius of said inner perimeter of said contact piece.
- 6. The contact configuration according to claim 5, wherein a.sub.1 =1 and f.sub.1 =0.30.
- 7. The contact configuration according to claim 4, wherein said slot contour is described by the following relation:
- r(.psi.)=R.sub.1 +(R.sub.K -R.sub.1)* ##EQU20## where 0.01<a.sub.2 <1.5 and 0/25 <f.sub.2 <1,
- with a.sub.2 being a shape factor, f.sub.1 being an exponent for influencing said slot contour, R.sub.K being the radius of said outer perimeter and R.sub.I being the radius of said inner perimeter of said contact piece.
- 8. The contact configuration according to claim 7, wherein a.sub.2 =1 and f.sub.2 =0.50.
- 9. The contact configuration according to claim 4, wherein said slot contour is described by the following relation:
- r(.psi.)=R.sub.I +(R.sub.K -R.sub.I)* ##EQU21## where 0.01<a.sub.3 <1.75 and 0.19<f.sub.3 <0.76,
- with a.sub.3 being a shape factor, f.sub.3 being an exponent for influencing said slot contour, R.sub.K being the radius of said outer perimeter and R.sub.I being the radius of said inner perimeter of said contact piece.
- 10. The contact configuration according to claim 9, wherein a.sub.3 =1 and f.sub.3 =0.38.
- 11. The contact configuration according to claim 4, wherein said slot contour is described by the following relation:
- r(.psi.)=R.sub.I +(R.sub.K -R.sub.I)* ##EQU22## and 0.01<a.sub.4 <a.sub.4 <0.88 and 0.37 <f.sub.4 <1.5,
- with a.sub.2 being a shape factor, f.sub.4 being an exponent for influencing said slot contour, R.sub.K being the radius of said outer perimeter and R.sub.I being the radius of said inner perimeter of said contact piece.
- 12. The contact configuration according to claim 11, wherein a.sub.4 =0.5 and f.sub.4 =0.75.
- 13. The contact configuration according to claim 4, wherein said slot contour is described by the following relation:
- r(.psi.)=R.sub.I +(R.sub.K -R.sub.I)* ##EQU23## where 0.34<f.sub.5 <1.35,
- with a.sub.5 being a shape factor, f.sub.5 being an exponent for influencing said slot contour, R.sub.K being the radius of said outer perimeter and R.sub.I being the radius of said inner perimeter of said contact piece.
- 14. The contact configuration according to claim 13, wherein f.sub.5 =0.67.
- 15. The contact configuration according to claim 5, including at least one of linear combinations and series expansions of said relation.
- 16. The contact configuration according to claim 7, including at least one of linear combinations and series expansions of said relation.
- 17. The contact configuration according to claim 9, including at least one of linear combinations and series expansions of said relation.
- 18. The contact configuration according to claim 11, including at least one of linear combinations and series expansions of said relation.
- 19. The contact configuration according to claim 13, including at least one of linear combinations and series expansions of said relation.
- 20. The contact configuration according to claim 4, wherein said slot contour is described by the following relation: ##EQU24## where ##EQU25## and 0.01<a<1 as well as 0.2<f<0.75,
- with a.sub.i being shape factors where i=1, 2, 3, 4, f being an exponent for influencing said slot contour, R.sub.K being the radius of said outer perimeter and R.sub.I being the radius of said inner perimeter of said contact piece.
- 21. The contact configuration according to claim 1, wherein said slots have a diameter D and a width b smaller than 1/10 of the diameter D=2 R.sub.K of said contact piece.
- 22. The contact configuration according to claim 21, wherein 0.04 D.ltoreq.b.ltoreq.0.1 D with 2 R.sub.K =D.
Priority Claims (1)
Number |
Date |
Country |
Kind |
196 24 920 |
Jun 1996 |
DEX |
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CROSS-REFERENCE TO RELATED APPLICATION
This application is a continuation of copending International Application No. PCT/DE97/01221, filed on Jun. 16, 1997, which designated the United States.
US Referenced Citations (4)
Foreign Referenced Citations (1)
Number |
Date |
Country |
195 09 714 A1 |
Sep 1996 |
DEX |
Non-Patent Literature Citations (1)
Entry |
Japanese Patent Abstract No. 64-19610 (Noda), dated Aug. 10, 1990. |
Continuations (1)
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Number |
Date |
Country |
Parent |
PCTDE9701221 |
Jun 1997 |
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