DE7036586U - CONTACT SPRING FOR RELAY. - Google Patents

Description

The invention relates to a contact spring for relays, in particular Electromagnetic relay, the contact spring with one end in a plastic base body consisting of a contact spring and a mating contact existing contact set is set and at the free end has a contact rivet and an extension on which an actuation Slide and / or B ^ activating comb attacks.

Such contact springs are mainly used as electromagnetic and pneumatically operated switching means used in conjunction with mating contacts to switch an energy circuit. For this purpose are in a Kumfcl etoff base body, which consists of several layered intermediate layers can, the contact springs with their opposing G «" gkcntakten set isolated from one another on one side, so that when pressure is exerted on the contact springs their contact rivets in the event

DiOl. Ιης. H »inz Uv. * F. C it- I ■; I.

13 ■ 8 f.V. v-i. M,

nmhn 81 ■ Telephone: (08Π) 48 ^ 20

-ά g ^ gsn the Ccgcnkontakie pressed v / earth and in the case? , one opening can be deducted from the mating contacts. t) the actuation occurs in electromagnetic relays by an electromagnet syntem with a movable magnet armor, which is moved by one stroke with the excitation of a magnetic coil, the stroke movement is transmitted to the contact springs either directly through the magentanker itself or via an interposed actuating slide and / or actuating comb.

Known contact springs with at their free end over the contact rivets protruding extensions are shown in the Swiss patent specification 305 545, 452 704 and in the Belgian patent specification 644 964, j In all versions, the extensions of the contact springs j actuating slides and / or actuating combs for lifting movement I

Transfer of the armature to. The in these documents disclosed relay counter springs, which also have contact rivets at the same height as the contact springs, which when the contact closes are pressed against each other. A safe and flawless j

Free contact is given when lifting or pressing j ken of the contact rivet of the contact spring against the contact rivet of the counter spring with an energy circuit to be closed and opened tolerable contact resistance of an unchangeable height suddenly is effected without bruises and switching sparks being formed. Comb relays and others are used to dampen the bruise known relay the counter springs supported by rigid shims in the direction of the contact springs.

If the contact spring is moved in the direction of the counter spring, it increases the spring characteristic is initially proportional to the stroke covered dee magjet anchor β. If the contact rivet of the contact spring comes to rest

Dipl.-Ing. HeOx lmer. (montan «. ^! D -o ■ '.. r. -ien o> ^f > -, n ..>t>. f ·, ·. · 81 · ΓοΙβΙοη: (0811) 48 38 20

! on the contact rivet of the pretensioned return spring, the characteristic increases

j jerky line jumps and only kinks again when the I : force has overcome the bias of the return spring (Fig. 6). The maximum bending moment occurs during the exertion of a compressive force j • on the extension of the contact spring directly in the area of the contact

rivet on the contact spring. This is a major disadvantage of known contact springs because, due to the contact resistance and the switching sparks, the highest temperature rise in the contact spring is recorded at this point. Even in the event of a brief electrical overload ^: or a change in the transition resistance values at the contact point, the heating of the contact spring in the area of the contact rivet can become so great that, with a high bending moment at the same time, a deformation of the contact spring occurs due to the softening of the spring material. This means that it is no longer possible to make perfect, reliable contact with the contact set. The same phenomenon is also given when using rigid mating contacts, since here the B 'moment in the contact area has its maximum.

Another disadvantage of known contact spring designs is that that the jump in the spring characteristic determines the maximum contact pressure and no optimal adaptation to the magnetic force-displacement curve; of an electromagnet system. This particularly affects

polarized electromagnetic relay with rotating armature, whose mag- j ; The netic force-displacement curve is much steeper than that of the neutral j

j relay runs. j

The invention is based on the object of designing a contact spring for relays, in particular electromagnetic relays, in such a way that their ^: characteristic curve has only two gradients at optimal contact pressure, at}

Dipl. Ing. Hein * Ih $ ü :. Pjto ^ l

D - 8 Mi ».Ί-η 31, Cov .. '. Ν, ΐιαβ * 81 Tuition. (0611) * S 38 20

has the smallest stroke and works almost bounce-free.

The object is achieved according to the invention in that the extension

the contact spring above the contact rivet by more than 90 to the longitudinal axis the contact spring is bent. When turning 180 is the radius of curvature of the bent extension of the contact spring i greater than half the stroke of the actuating slide β and / or actuating ■ comb. The dimensioning of the distance at which the bending of the extension The choice to be made towards the contact element depends on the application. j

The invention also provides. daü the point of application of the actuation slide and / or actuating comb is located on the bent extension of the contact spring and is most expediently on the same Height with the contact rivets. The extension can be done immediately end below the contact rivet. The contact rivets of such a shaped KoiAktfeder are facing away from the curved extension Side of the contact spring attached.

In a further embodiment it is provided that each contact spring associated contact rivet with actuation of the contact spring by exerting pressure on the outside of the curved extension against a firm mating contact is pressed. This training has the advantage that when the contact closes in a jerky pulse-like manner high-frequency natural oscillation of the contact spring has such a high energy consumption that switching is guaranteed to be almost bounce-free is. A contact spring designed according to the invention has a further advantage a favorable bending moment curve. With these contact springs, the maximum bending moment is no longer at the point of

Dipt.-Ing. Home uo ^. Cv <: * - Manwult D --Ö K ^ .- c. ^ R, 81. Ccsri ^^ fus 8 "l · Telephone: (0811) 48 38 20

maximum heating, i.e. in the area of the contact rivets, but in the Arch of the extension of the contact spring bent by more than 90. This part of the contact spring is not subject to any heating electrical current, as this only flows through the first part of the contact spring over the contact rivet. A deformation with a slight softening of the material therefore cannot occur. The contact pressure generated by dsm ■ Contact rivet of the contact spring on the contact rivet of the mating contacts from i is practiced, so it can be done without hesitation by increasing the armature stroke |

can be increased. j

In the case of bilateral actuation of contact springs designed according to the invention is an essential «· further advantage. A bilateral actuation exists when the contact spring by means of a vertical to the longitudinal axis of the contact spring arranged actuating comb in Direction on the mating contact pressed and from the mating contact you »ch «In a tear-off driver fixed on the actuation comb

I will be drawn. This contact activation comes among other things also in relays with I

Internal swivel anchor for use (DBP 1 213 917), whereby the pivotable Internal rotating armature mounted in the center bore of the coil body i

the actuation comb or actuation arm is fixed.

The bilateral actuation of the contact is intended to ensure that in the event of the contact rivet of the contact spring sticking or burning to the contact rivet of the mating contact, the movement of the Anchor is blocked when switching over, so that the remaining switching contacts of the spring seat does not completely change its switch position can, since the movement contact is in an intermediate position remains in place until the bonded or burned connection tears open. : Just because of this let a functional contact switching is guaranteed.

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Dipl .-! Ng. Heini Lasse ». Paientomva! " D -8 coins 81, Cosim.jsliaB- 81 · Telephone: (0611) 48 38 50

The drivers of the actuation chamber, which cause the tear and the arid pressures of the contact spring, come to rest on the spring legs directly in the area of the contact rivet in the case of a contact spring designed according to the invention. If the fastening point of the actuating comb on the internal rotating anchor is placed on the same plane, only a minimally small torque is exerted on the actuating comb and thus on the bearing of the internal rotating anchor when the locking spring is actuated. The torque is proportional to the tangential component of the respective tear-off and pressing force. According to the invention, the tangential component is very small. Tilting of the internal pivot anchor is therefore not possible. The functionally reliable contact of the contact spring set is always guaranteed.

When using contact springs with a protruding over the contact rivet The drivers of the actuation cam are located in an un curved extension, as has been mentioned in relation to the prior art no longer on the same level as the fastening point on the magnet

I anchor. While the Abrißmitnehmer again above the contact rivet j

the contact spring comes to rest, the pressure driver is on the |

set the top of the extension. This also applies to symmetrical Training of the actuating comb, the tangential components of the attack forces of the driver are much larger, so that on the actuating comb a torque is exerted which, when the actuating comb is rigidly mounted, is transferred to the bearing of the internal rotating armature and this so canted in its leadership that a functionally reliable Pivoting of the internal rotating anchor does not guarantee; is.

Other advantages of the contact spring are when used in polarized Find relay. Since the spring characteristic has no jump,

lesser, Poten'.anwolt

D - 8 Münaien 81. Ccslmcilra & e 81 ■ Telephone: ^ 11) 48 38 20

is an optimal design of the contact spring based on the steep one magnetic force-displacement curve of the electromagnet element possible. This results in a much higher contact than with known ones contact springs with the same cross-section er £ 4bar. The spring characteristic can by corresponding changes in the cross section of the contact spring adapted to the magnetic force-displacement line of an electromagnet system will. It is expedient to provide, for example, rectangular cross-sections for the contact springs according to the invention.

The force P does not have to act at the same level from the contact rivets, but can be attached to the free shank of the bent extension above or below the contact rivet. An optimal one However, the solution is given if the force is the same on the extension attacks, which corresponds to the height of the contact rivet. The following is based on examples with reference to the accompanying drawing of the subject invention are described in more detail. In the drawing show:

Fig. 1 shows an electromagnetic relay with one attached to the magnet yoke Contact set with a contact spring designed according to the invention in the front view,

Fig. 2 shows a separately drawn contact approach with a fiction according to the formed contact spring in the front view,

3 shows the contact set shown in FIG. 2 in a side view,

4 shows the contact set shown in FIGS. 2 and 3 with a according to the invention and actuated by a force "P" Contact spring in the front view,

5 shows a spring characteristic curve of the invention shown in FIGS. 1 to 4 formed contact spring, and

6 shows a spring characteristic curve of known contact spring arrangements.

DipL-lng. H «ini 1 * β% τ. Patenton-alt D-3 Mundien 81, Coiimost / ofj «81 · Telephone: (0811) 48 ^ d 20

Fig. 7 shows two symmetrically arranged inventions according to au β ge image r.t · -

Contact spring ^ in a & elfeie with internal swivel anchor, whereby on the an actuating comb is mounted pivotably in the central bore of the coil body »mounted internal rotating armature, which on the contact springs acts.

The electromagnetic relay shown in Figure 1 consists of one on the magnet yoke 1, on which a column core 2 is positively attached, on which a bobbin 3 with a wound magnet coil 4 is drawn. The bobbin 3 has a cutter bearing 5 on a flange for receiving an angled magnet armature 6 which, when the magnet coil 4 is excited, can be pivoted towards the end face of the bobbin 2 with a stroke F and the magnetic circuit over the magnet yoke 1 closes. The other end of the angled armature grasps directly with an actuating comb 7 against the outside of a bent extension β of a contact spring 9, which is fixed on one side in a plastic base body 10, which consists of three plastic interlayers. While the contact spring 9 is inserted between the first two plastic intermediate layers, there is a rigid mating contact 11 between the middle and the upper intermediate layer Magnetic yoke 1 screwed on so that they run parallel to the longitudinal axis of the coil core. For soldering electrical connection lines, the contact spring 9 and the mating contact 11 have a projection protruding from the plastic base body 10, in which soldering lugs 16 are incorporated. Opposite the Ang ^ iffpunkt of the armature 6 on the extension 8 of the contact spring 9 is fixed a contact pin 14 on the outside of which is in alignment with a contact rivet 15 de "GegenkontaAt tu. 11 The extension 8 is above the

Oip>) .- Ing. Heini L "u" r. Patent attorney

D - 8 Munich 81, Coji-miitfo & e 81 ■ Telephone: (0811) 48 38 20

Contact rivet 14 bent by 180 and runs backwards parallel to the longitudinal axis of the contact spring 9. The bending diameter of the extension 8 is chosen larger aiii the air gap between the end face the coil core 2 and the magnet armature 6.

The contact set shown in Fig. 1 is reduced by the Fig. 2 to 4 highlighted separately.

With the excitation of the magnetic coil 4, the lifting movement of the magnetic cores becomes 6 is transmitted as a force “P” to the extension 8 of the contact spring 9 via the actuating comb 7. Because the air gap between the Kontalfaieten 14 and 15 is minimally small, the contact rivet 14 comes after a short time Time to rest on the cortactic rivet 15. With further pivoting of the magnet armature 6, the contact pressure exerted by the contact rivet 14 on the contact rivet 15 (FIG. 4) increases.

The maximum bending moment with this contact spring is with actuation given by the magentanker 6 to the arch of the extension 8. At this point, however, is the one caused by the electric current Heating of the contact spring 9 minimally small - so that a deformation of the contact spring 9 including its extension 8 does not occur can.

The dimensioning at which distance the bending of the extension 8 to take place with respect to the contact rivet 14 depends on the application case at. The distance from the cortactic rivet 14 to the outer curvature of the extension 8 is also decisive for the contact pressure exerted. Furthermore, the force "P" does not need to be attacked by the cortex rivets 14 at the same level as in the examples shown, but is above

Dipl.-Ing. Heim l * »» r, Polentanwalt Ü-8 KA.nciien 81. Coiin-.ostruh «81 ■ Telephone; (0611) 48 38 20

half or below the contact rivet 14 on the free leg of the bent extension 8 can be attached. However, an optimal solution is given when the force acts on the extension 8 at the same level, which corresponds to the height of the contact rivets 14 and 15.

5 shows a spring characteristic curve of a spring characteristic curve designed according to the invention Contact spring 9 shown. As can be seen from this, the force requirement of the contact spring 9 increases until the contact rivet 14 is placed on the contact rivet 1 5 of the counter spring increases linearly with the stroke movement of the armature 6 and then increases in accordance with the remaining stroke movement with a steep rise ar .. Em essentially h5h «? r« r contact pressure compared to known contact springs is possible; Furthermore, the spring characteristic can be changed by corresponding changes in the cross section of the contact spring 9 of the magnetic force-displacement characteristic of an electromagnetic system can be adapted.

In Fig. 6 is the spring characteristic of a known contact spring arrangement shown. Characteristic of this is the sudden rise and the then flattened further course of the characteristic curve with increasing Armature stroke. This jump prevents an optimal adjustment of the Spring characteristic to a magnetic force-displacement characteristic of an electromagnetic system.

It goes without saying that the invention is not limited to the embodiment shown β is limited in games. One according to the invention offers particular advantages trained contact spring in connection with small relay and polarized relays. Instead of flat springs, the invention can also be applied to round springs. The contact spring can also be preloaded against a mating contact as an opener. Then the actuator slide must and / or actuating comb against the outer surface of the

ι "j

Dipi.-lng. Heinz Leuer, patent attorney 0 - 8 Munich 81. Cosii astrofte 81 ■ Telephone: (OBIl) 48 38 20

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He arched the extension tube and, with excitement, the electromagnet. pull the contact rivet off the mating contact.

The ReIa is shown in Fig. 7 consists of a coil body 17,

, in the central bore of which an internal rotating armature 18 is pivotably mounted

'is to which an actuating comb 19 is attached. The actuation comb

! 19 is two-sided and symmetrical and has on both of them

1 ends each with a tear-off driver 20, 20a and a pressure driver

! 21, 21a, which against the extension 8,8a of a contact spring 9, 9a

1 grasp, the contact springs 9. 9a symmetrically to the relay center axis

: are arranged and fixed in the bobbin 17. The contact springs

\ 9, 9a are arranged parallel to associated mating contacts 11, 11a.

When the actuating comb 19 is actuated, one contact spring 9

j with its contact rivet 14 from the contact rivet 15 of the mating contact 11

i withdrawn, while the other contact spring 9a with its contact rivet 14a

j against the contact rivet. 15 a of the mating contact 11a is pressed. to

for this purpose, the tear-off drivers 20, 20a engage immediately above

ι the contact rivets 14, 14a of the contact springs 9, 9a., while the Andrücl ^ -

j driver 21, 21a are set on the actuating comb 19 that they

i at the same height as the contact rivets 14/15, 14a / l5a, but on the

! facing away from the curved extensions 8,8a of the contact

I feathers 9, 9a come to the attack. Both drivers 20/21, 20a / 21a

] attack the contact springs 9, 9a at almost the same height. There too Attachment point of the actuation comb 19 is angeorndet on the inner rotating anchorage on the same level, when the actuation arm 19 is actuated with the excitation of the solenoid 4, no torque is generated by the Tangential component of the attack forces exerted on the actuating comb 19 and the internal rotating anchor 18 rigidly connected to it. A tilt the internal rotating anchor 18 or bracing in its mounting is therefore locked out. In the event of a tilt, it would come in the case of the minor ones

Dipl.-Ing. Heim LeiMir, Paieiitunwolt Ü— 8 Mundien 81, Cosinatliabe 81 · Telephone: (Οβίΐ) 48 38 20

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Air gaps for placing the internal rotating anchor Iu on the ear tip surfaces dee bobbin 17, so that the relay switching functions could no longer exercise.

Claims (9)

PROTECTION CLAIMS 1. Contact spring for relays, in particular electromagnetic relays, the contact spring being fixed at one end in a plastic base body of a contact set consisting of a contact spring and counter-contact and having at least one contact rivet and an extension at the free end, on which an actuating slide and / or actuating chimney engages , characterized in that a further contact spring (9a) is arranged in a mirror-inverted manner to the contact spring (9) and both contact springs (9, 9a) are adjustable by a bilateral and symmetrical actuating comb (19), one contact spring (9) with its contact rivet (14) can be pulled off a contact rivet (15) of the mating contact (11), while the other Kontaktfe of (9a) with its contact rivet (14a) can be pressed against the contact rivet (15a) of the mating contact (Ha). 2. Contact spring for relay according to claim 1, characterized in that the pulling and pressing means on the actuating comb _% 'l9) are arranged at almost the same level on the contact (9, 9a) engaging drivers (20, 20a, 21, 21a) are. 3. Contact spring for relays, in particular according to claims 1 or 2, characterized in that the extension (8) by more than 90 degrees to the longitudinal axis of the Contact spring (9) is bent and the actuating slide and / odor control comb (7) on the free leg of the bent 70365S6-7.10.71 D.pl Ing helmet lauar. Patent Attorney D - 3 Munich 81. Coiimastrofte 81 Telephone; '.081I) 433820 NEN extension (8) attacks. 4. contact spring for relay according to claim 3, characterized in that the extension (8) around 180 degrees with respect to the longitudinal axis of the contact spring (9) is bent. 5. contact spring for relay according to claim 4, characterized in that when turning around 180 degrees is the radius of curvature of the extension (8) of the contact spring (9) 1st greater than half the stroke of the actuating adhesive and / or actuating comb (7). 6. Contact spring for relay according to claims 3, 4 or 5, characterized in that the contact rivet or rivets (14) on the curved extension (8) facing away from the contact spring (9) are attached. 7. Contact spring for relay according to one of the preceding claims , characterized in that the actuating slide and / or actuating comb on the free leg of the extension (8) at the level of the contact rivet (14) attacks. 8. contact spring for relay according to claim 7, characterized ge indicates that the actuating slide and / or actuating comb (7) on the outer surface of the curved Extension (8) attacks. 9. contact spring for relay according to claim 7 _f, characterized in that the actuating slide and / or actuating comb (7) on the inner surface of the curved. Extension (8) attacks.