Title:
MERCURY-FREE POSITION SWITCH
Document Type and Number:
WIPO Patent Application WO1993026025
Kind Code:
A3
Abstract:
A mercury-free position switch has a housing (1) made of an insulating material, such as glass, with at least two straight or bent wire electrodes (3, 3', 4, 4') that enter the housing. The housing (1) is partially filled with an electroconductive liquid (2) which establishes or breaks a contact between the electrodes (3, 4) according to the position of the position switch. At least one electrode (4, 4') is surrounded by an insulating material (5) at its point of entry in the housing. Switching occurs sharply at a certain distance from the wall of the housing both when contact is made or broken by means of the fluid.
Inventors:
HAHN GUSTAV (DE)
Application Number:
PCT/DE1993/000474
Publication Date:
March 17, 1994
Filing Date:
June 02, 1993
Export Citation:
Assignee:
HAHN GUSTAV (DE)
International Classes:
H01H9/54; H01H11/02; H01H29/04; H01H29/06; H01H29/22; (IPC1-7): H01H29/22; H01H9/54; H01H11/02; H01H29/04; H01H29/06
Foreign References:
| FR700637A | 1931-03-05 | |||
| DE1852852U | 1962-06-07 | |||
| EP0043058A1 | 1982-01-06 | |||
| DE3739193A1 | 1989-06-01 | |||
| US2087738A | 1937-07-20 | |||
| FR2249420A1 | 1975-05-23 | |||
| FR2579008A1 | 1986-09-19 | |||
| DE9106526U1 | 1991-09-19 | |||
| GB972216A | 1964-10-07 | |||
| US2387313A | 1945-10-23 | |||
| FR2146376A1 | 1973-03-02 | |||
| EP0208944A2 | 1987-01-21 | |||
| US4591781A | 1986-05-27 |
Other References:
F.W. KEAR: "TAKE A SECOND LOOK AT MERCURY SWITCHES", EDN ELECTRICAL DESIGN NEWS, vol. 15, no. 2, 15 January 1970 (1970-01-15), NEWTON, MASSACHUSETTS US, pages 53 - 58
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