EP2191484A1 - Elektrisches drahtfederkontaktsystem - Google Patents
Elektrisches drahtfederkontaktsystemInfo
- Publication number
- EP2191484A1 EP2191484A1 EP08801656A EP08801656A EP2191484A1 EP 2191484 A1 EP2191484 A1 EP 2191484A1 EP 08801656 A EP08801656 A EP 08801656A EP 08801656 A EP08801656 A EP 08801656A EP 2191484 A1 EP2191484 A1 EP 2191484A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- contact
- holding element
- leg
- contact system
- spring
- 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.)
- Granted
Links
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H1/00—Contacts
- H01H1/12—Contacts characterised by the manner in which co-operating contacts engage
- H01H1/14—Contacts characterised by the manner in which co-operating contacts engage by abutting
- H01H1/24—Contacts characterised by the manner in which co-operating contacts engage by abutting with resilient mounting
- H01H1/245—Spring wire contacts
-
- 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
- H01H11/0006—Apparatus or processes specially adapted for the manufacture of electric switches for converting electric switches
- H01H11/0012—Apparatus or processes specially adapted for the manufacture of electric switches for converting electric switches for converting normally open to normally closed switches and vice versa
Definitions
- the invention relates to an electrical contact system, in particular for low voltage, with an access contact and with at least one outgoing contact. It comprises a wire contact spring, which is held centrally by a holding element in the contact system. On both sides of the retaining element, two straight-extended contact legs spread out with approximately the same length. The contact legs clamp without applying an elastic bias between them an obtuse opening angle.
- wire cross contacts as proposed, for example, in DE 102004012777 B3 or in DE 7721796 U1.
- the contact force acts only at a very small point of contact and in this way foreign layers are easier to pierce.
- Slip contacts rub on the pad to remove the debris or oxides, but they also create undesirable abrasion and dig into the material at one point.
- An improvement for the life bring here, for example, sliding contacts with a tangential contacting, as described in DE 19817796 C2 or DE 1489080 A.
- a combination of contact spring with pins as cross contact with tangential friction movement at the contact point can be found in the contact arrangement of an electromagnetically actuated relay according to DE 1071837 B.
- a contact arrangement for low voltages with a spring wire which is wound in less than one turn around a first contact pin and extended to rest against a first contact pin by a first wire leg (US 3,946,185).
- the spring wire has a second, fixed wire leg for elastically bringing the first wire leg into contact with a second contact pin.
- a third contact pin is near the spring wire and on the second Contact pin provided opposite side, being brought by pressure on the spring wire at a position between the first and the second contact pin of the spring wire in elastic contact with the third contact pin.
- the contact system is only designed for very small switching strokes.
- the contact system is not suitable because the spring wire with less than a number of turns on the support member will be claimed beyond its elastic limit, and thus would have a very limited life ,
- the core of the invention is formed in a special shape and storage contact spring.
- the contact spring of the contact system is held centrally by a holding element in the contact system.
- two, straight-stretched contact legs spread out with approximately the same length, wherein the contact legs clamp between them an obtuse opening angle without applying a resilient bias.
- a first contact leg is against a trained as the first support access contact and a second contact leg is applied against a second insulating support with increasing the ⁇ ffhungswinkels and generating a bias voltage.
- Adjacent to the second contact leg at least one outgoing contact is arranged.
- the contact system can be designed as an opener or as normally open or as a changeover switch. This is achieved by the arrangement of outgoing contacts on the side of the second contact leg.
- the alternative training can be:
- (1) Normally closed contact The first outgoing contact lies on the side of the second contact leg facing the retaining element and is contacted by the second contact leg when the retaining element is at rest.
- a second outgoing contact lies on the side of the second contact leg facing away from the holding element and is only touched by the second contact leg when the holding element is actuated.
- the arrangement according to the invention is used for the low-current range, where it it is important to reliably switch small voltages and small currents over many load cycles. Investigations of the arrangement have shown that the contact system reaches a contact reliability of well over 1 million.
- the contact legs should preferably be of the same length so that they come symmetrically to the plant to the associated contacts. Both contact legs are brought to the deflection and thereby released from contact and brought into contact with another contact.
- the contact legs are each fixed to a support bearing, one of which is provided as a first outgoing contact and the switching positions are achieved by changing the opposite contact of the first outgoing contact leg of the contact spring between an opening outgoing contact and a closing outgoing contact.
- one contact leg of the contact spring Upon actuation of the actuating tappet, one contact leg of the contact spring always bears on one pole contact pin (the "access contact") and the other contact leg is fixed to a support bearing (for example: a nose or projection in the plastic housing) an NC contact pin and a NO contact pin moves.
- a support bearing for example: a nose or projection in the plastic housing
- the holding element is designed as a perpendicular projecting from the actuator pin or pin.
- the contact spring is wound around the perpendicular projecting from the actuating element (actuating plunger) pins with at least one turn.
- the holder of the contact spring on the actuating element is in the form of a pin, such that slipping of the contact spring is prevented by the actuating element.
- the installation of the contact spring is done with bias.
- the bias and the restoring force generated during actuation effect a positive pressing of the spring coils on one side of the pin.
- the number of turns together with the spring characteristic of the spring wire determines the spring constant of the contact spring. Due to the structural design and the appropriate material selection, the required contact force can be securely applied to each contact points with the contact spring. Furthermore, with the contact spring and a secure through-stroke of the actuating plunger are executed.
- the two contact legs of the contact spring Due to the linear movement of the actuating plunger with a journal bearing of the contact spring coils, the two contact legs of the contact spring have a tangential friction and sliding movement on the cylinder outer surface of the fixed contact pins. Dirt particles or oxides are removed at the contact points by the movement; There is a self-cleaning of the respective contact points.
- the mechanical, constructive and material training of the contact system should preferably be such that the largest possible stroke (> 5 mm) on the actuating element (actuating tappet) and Hubuntersburg the change-over contact is present.
- the contact spring By a positive retention of the contact spring on the actuating plunger, the contact spring also provides the return force for the actuating plunger. Another element for returning the actuating plunger to its home position is not necessary.
- the material of the contact spring is spring steel, which may have a noble metal coating.
- the spring steel can continue to be designed as polished, stainless steel spring steel. Its coating may be made of precious metal (e.g., gold or rhodium).
- the contacts, or the pins should be made of conductive material, such as pins made of wire, carbon fibers, graphite, graphite with Cu impregnation, silver or a silver alloy.
- Metallic contacts may be provided with a coating of nickel (with good corrosion resistance).
- Metallic outgoing contacts can be soldered on or in the wiring plane, whereas carbon contacts are incorporated with a solderless fastening technique. The latter can be done by pressing into a conductive foil and additionally secured with conductive adhesive or conductive ink.
- the material pairings between contact points on the contact spring and the respective associated contacts can be chosen so that existing thermal stresses are compensated.
- the thermoelectric voltages are compensated.
- a different material pairing usually has better friction coefficients and sliding properties.
- At least one contact leg can be extended beyond the distance between the holding element and the support or contact point addition.
- the protruding extension is bent into a U and bent back parallel to the contact leg.
- at least one contact leg is formed as a double, juxtaposed spring wire. Due to the doubling of the at least one contact leg, a double contact (also called H contact) arises at the contact leg associated with the output leg.
- H contact also called H contact
- the contacts of the assembly are formed as pins and fixed on a mounting or wiring plane.
- the contacts may be soldered in the wiring plane or otherwise secured there (eg, by solderless attachment technique).
- the contact system can be doubled in an electrical switch housing. In this case, a first contact system can be arranged above the fastening plane and a second contact system can be arranged below the fastening plane.
- an electrical connection can be made with electronics also arranged there with a printed circuit board or the MID technology.
- a double trained contact system may be provided with an electronic control such that via a mutual control of the pole pins, once for the first contact system and the other time for the second contact system, is detected and controlled by the electronics, which of the two actuating tappet straight is pressed.
- Such a changeover switch offers the advantage of additional query security and error detection.
- Fig. 2 is a plan view of a contact system with U-shaped bent contact legs and Fig. 3 A and 3B two contact systems on a wiring level.
- FIG. 1 side view and top view are shown on a contact system, which works as a changeover switch.
- an access contact 20 and two outgoing contacts 22, 24 are arranged on an attachment or wiring plane 51.
- solid contacts serve (in the form of contact pins) simple round wires (or rods).
- the moving contact is formed by the contact spring 10 with its two straight-extended contact legs 14, 16.
- Contact pins and contact spring are arranged at an angle of 90 degrees to each other.
- the contact spring is held centrally by a holding member 32 having a plurality of turns, which is arranged on an actuating plunger 30 as a vertically projecting pin.
- the contact legs 14, 16 spread apart on either side of the support member 32 with approximately the same length, wherein the contact legs 14, 16 span without applying an elastic bias voltage V between them a large obtuse opening angle W.
- the contact legs Upon actuation of the actuating plunger 30, the contact legs are pushed beyond the angle of 180 ° addition.
- the contact system also allows a certain amount of movement of the contact movement.
- the first contact leg 14 is against the access contact 20 and the second contact leg 16 is applied against the insulating support 26 by increasing the opening angle W.
- the support 26 may be formed as a housing projection or as a round pin.
- First 22 and second outgoing contact 24 are disposed in the vicinity of the second contact leg 16, and come into alternation with the contact leg 16 in contact when the actuating plunger 30 is activated.
- the contact system - by omitting the contact 24 - even a departure contact 22 may have.
- the contact system is to be regarded as a normally closed or normally open contact.
- the contact system is designed as a normally closed contact, if an outgoing contact (for example 22) lies on the side of the second contact leg 16 facing the holding element 32 and is touched by the second contact leg 16 in the rest position of the holding element 32.
- the contact system is designed as a make contact if a feeder contact (for example 24) lies on the side of the second contact leg 16 facing away from the holding element 32 and is not touched by the second contact leg 16 until the holding element 32 is actuated.
- the contact legs 14 and 16 have a modified form. Both contact legs are extended beyond the distance between the holding element and the support or contact point addition. The protruding extension is bent to a U and bent back parallel to the contact leg. Each contact (20, 22, 24) is thus contacted twice by the U-shaped contact legs (14 'and 16'). There is a double contact (also called H contact).
- the wiring plane may (as in FIG. 1) be a continuous plane or as in FIGS. 3A and 3B.
- the training depends on the structure of the switch housing, which is not shown in detail.
- the contact systems are operated by separate actuators (32, 32 ') and each have a contact spring 10 and 40.
- the contacts are soldered in the wiring plane, wherein in the upper part of the figure, the contact pins once to the front of the wiring level 51 protrude and the contact pins of the second contact system are formed on the back of the wiring plane 51.
- the contacts 22 and 24 may be at the same electrical potential, so be guided solidly through the wiring plane 51 therethrough.
- the access contact on the front side (20) alone is electrically separated from the access contact (20 ') on the rear side of the wiring plane 51.
- the contact pins for NC (eg 22) and NO (eg 24) are used by bothmaschinefedem (10, 40) as a counter-contact, the two pole pins (20 and 20 ') contact only once the contact spring in the first contact system and on the other hand, the contact spring in the second contact system housing.
- the contact systems are on the same side of the wiring plane 51 '.
- the details and reference numerals of the two sub-figures 3A, 3B correspond to the previously discussed figures, so that these details will not be described repeatedly.
- an electronics can be used for monitoring, which checks which of the two plungers has just been operated and which not.
- the changer offers the advantage of an additional query security of the plunger position.
- An electronic system can evaluate both signals and can give a message as to whether the plunger has been pressed or whether a contact error has occurred.
- the electronics of the contact systems can continue to be integrated. This is immediately obvious, since small electronic circuits suitable for low-voltage applications can be applied and integrated by means of MID technology or in the form of a printed circuit board. For the integration of the electronics can contribute further, if in the wiring level LED displays (for switch positions) and plugs for electronic connections, for example, as BUS contacts are additionally integrated.
Landscapes
- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Push-Button Switches (AREA)
Abstract
Description
Claims
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| PL08801656T PL2191484T3 (pl) | 2007-09-22 | 2008-08-21 | Układ styków elektrycznych ze sprężyną drutową |
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE200710045432 DE102007045432B3 (de) | 2007-09-22 | 2007-09-22 | Elektrischer Schaltkontakt |
| PCT/EP2008/006880 WO2009036859A1 (de) | 2007-09-22 | 2008-08-21 | Elektrisches drahtfederkontaktsystem |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| EP2191484A1 true EP2191484A1 (de) | 2010-06-02 |
| EP2191484B1 EP2191484B1 (de) | 2017-11-22 |
Family
ID=39938219
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP08801656.3A Active EP2191484B1 (de) | 2007-09-22 | 2008-08-21 | Elektrisches drahtfederkontaktsystem |
Country Status (4)
| Country | Link |
|---|---|
| EP (1) | EP2191484B1 (de) |
| DE (1) | DE102007045432B3 (de) |
| PL (1) | PL2191484T3 (de) |
| WO (1) | WO2009036859A1 (de) |
Family Cites Families (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE1071837B (de) * | 1956-03-23 | |||
| US3297973A (en) * | 1963-08-30 | 1967-01-10 | Poly Scient Corp | Floating-brush contact assembly |
| US3548137A (en) * | 1968-06-20 | 1970-12-15 | Chicago Switch Inc | Switch construction |
| DE2214340C3 (de) * | 1972-03-24 | 1975-12-18 | Loewe Opta Gmbh, 1000 Berlin | Drucktastenschieber mit parallel zur Kontaktebene relativ zueinander gegen die Federkraft einer Rückstellfeder verschiebbaren Kontaktträgern |
| US3946185A (en) * | 1974-08-21 | 1976-03-23 | Intersil, Inc. | Spring wire contact assembly |
| IE43595B1 (en) * | 1974-11-25 | 1981-04-08 | Swann D | Electric switches |
| DE7721796U1 (de) * | 1977-07-12 | 1978-10-05 | Kodak Ag, 7000 Stuttgart | Kontaktschalter an einer photographischen kamera |
| US4119821A (en) * | 1977-09-26 | 1978-10-10 | Stackpole Components Company | Normally closed switch |
| DE2937925C3 (de) * | 1979-09-19 | 1982-04-15 | Siemens AG, 1000 Berlin und 8000 München | Schalter |
| DE19817796C2 (de) * | 1998-04-21 | 2001-04-12 | Schleifring Und App Bau Gmbh | Schleifkontaktanordnung mit verlängerter Lebensdauer |
| DE19856678C2 (de) * | 1998-12-04 | 2002-01-24 | Moeller Gmbh | Elektrische Schaltvorrichtung |
| US6521852B1 (en) * | 2002-05-06 | 2003-02-18 | Shin Jiuh Corp. | Pushbutton switch |
| DE102004012777B3 (de) * | 2004-03-15 | 2005-11-10 | W.C. Heraeus Gmbh | Kontaktkörper, insbesondere für Schaltkontakte sowie Kontaktanordnung mit einem derartigen Kontaktkörper sowie seine Verwendung |
-
2007
- 2007-09-22 DE DE200710045432 patent/DE102007045432B3/de not_active Expired - Fee Related
-
2008
- 2008-08-21 WO PCT/EP2008/006880 patent/WO2009036859A1/de not_active Ceased
- 2008-08-21 PL PL08801656T patent/PL2191484T3/pl unknown
- 2008-08-21 EP EP08801656.3A patent/EP2191484B1/de active Active
Non-Patent Citations (1)
| Title |
|---|
| See references of WO2009036859A1 * |
Also Published As
| Publication number | Publication date |
|---|---|
| PL2191484T3 (pl) | 2018-10-31 |
| EP2191484B1 (de) | 2017-11-22 |
| WO2009036859A1 (de) | 2009-03-26 |
| DE102007045432B3 (de) | 2009-04-16 |
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