US3737829A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Contactless switching device
Assignee: Siemens AG
•
Filing: 1971-11-22
•
Granted: 1973-06-05
•
Expires: 1991-11-22
Abstract
Abstract In a contactless switching device, a permanent magnet can be moved relative to a magnetic field dependent resistance positioned between return yoke parts. The longitudinal axis of the magnetic field dependent resistance is in the direction of the neutral zone of the permanent magnet. The return yoke parts face the poles of the permanent magnet over a large area. In order to remove the lines of force from the magnetic field dependent resistance, a part causing a magnetic short-circuit is inserted after the return yokes in the direction of movement of the permanent magnet. It is thereby possible to relieve the magnetic flux practically completely in the OFF position of the device with a relatively small distance of travel of the permanent magnet.
Inventors
- 👤 H Schneider
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 01:13
CPC Classifications
H; H03; H03K; H03K17/00; H03K17/51; H03K17/90; H03K17/80
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
160 words
A contactless switching device, comprising a return yoke having retuRn yoke parts; a magnetic field dependent resistance having a longitudinal extension positioned between the return yoke parts; a short-circuiting part for short-circuiting the magnetic flux of a magnet; a permanent magnet having a neutral zone, the permanent magnet being movable with the neutral zone in the direction of the longitudinal extension of the magnetic field dependent resistance between at least two defined positions, in one of which the permanent magnet is effectively magnetically coupled to the return yoke parts thereby providing magnetic flux through the return yoke and the magnetic field dependent resistance and in another of which the permanent magnet is effectively coupled to the short-circuiting part thereby removing the magnetic flux from the return yoke and the magnetic field dependent resistance, the return yoke and the short-circuiting part being positioned in tandem and being magnetically separated from each other in the direction of movement of the permanent magnet.
Claim 2
Dependent Claim
160 words
A contactless switching device, comprising a return yoke having retuRn yoke parts; a magnetic field dependent resistance having a longitudinal extension positioned between the return yoke parts; a short-circuiting part for short-circuiting the magnetic flux of a magnet; a permanent magnet having a neutral zone, the permanent magnet being movable with the neutral zone in the direction of the longitudinal extension of the magnetic field dependent resistance between at least two defined positions, in one of which the permanent magnet is effectively magnetically coupled to the return yoke parts thereby providing magnetic flux through the return yoke and the magnetic field dependent resistance and in another of which the permanent magnet is effectively coupled to the short-circuiting part thereby removing the magnetic flux from the return yoke and the magnetic field dependent resistance, the return yoke and the short-circuiting part being positioned in tandem and being magnetically separated from each other in the direction of movement of the permanent magnet.
Claim 3
Dependent Claim
71 words
A contactless switching device as claimed in claim 1, wherein the permanent magnet is a slab magnet, the return yoke is of U-shape having a back in which the magnetic field dependent resistance is accommodated, the return yoke surrounding the permanent magnet in the one position of said magnet, and the short-circuiting part comprises a frame surrounding four outer surfaces of the permanent magnet in the other position of said magnet.
Claim 4
Dependent Claim
25 words
A contactless switching device as claimed in claim 1, further comprising a spacer interposed between and magnetically separating the return yoke from the short-circuiting part.
Claim 5
Dependent Claim
20 words
A contactless switching device as claimed in claim 1, wherein the short-circuiting part comprises a short-circuiting yoke of U-shaped configuration.
Claim 6
Dependent Claim
81 words
A contactless switching device as claimed in claim 1, wherein the permanent magnet is of substantially U-shape having a head member and spaced legs extending therefrom, the return yoke comprises a pair of pole pieces having end faces and the magnetic field dependent resistance positioned between said end faces, and the short-circuiting part comprises a bridge between the legs of the permanent magnet at a space from said pole pieces in the direction of the head member of the permanent magnet.
Claim 7
Dependent Claim
24 words
A contactless switching device as claimed in claim 5, wherein the short-circuiting part comprises a bridge partly surrounding the legs of the permanent magnet.
Claim 8
Dependent Claim
29 words
A contactless switching device as claimed in claim 5, wherein the short-circuiting part comprises a bridge cross piece of H-shape partly extending around the legs of the permanent magnet.
Claim 9
Dependent Claim
36 words
A contactless switching device as claimed in claim 5, wherein the head member of the permanent magnet comprises a magnet carrier and the legs of said magnet comprise two slab magnets mounted on said magnet carrier.
References Cited (Backward Citations)
US3571774A
Cited
US3622922A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-06-04 | 1976-12-04 | 1977-06-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-06-04 | 1980-12-04 | 1981-06-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-06-04 | 1984-12-04 | 1985-06-05 | $7700.00 | Window Closed / Lapsed |