EP1143474B1 - Relay - Google Patents

Abstract

The relay has an electromagnetic drive (15) on one side of a dividing wall (17) parallel to the core axis with a coil and a movable armature (21), a row of contacts (27, 29) on an insulating bearer (33) on the other side of the wall and contact springs (27) with a foot at one end in the bearer part and a movable contact head at the other end. The springs are driven by a comb (23) and are mounted between the comb and wall.

Description

The invention relates to a safety relay with at least one electromagnetic drive. This has a connectable to a control current coil core / yoke and a movable armature. The relay further comprises a comb movable by means of the armature and a row of a plurality of contacts arranged on an electrically insulating support part. The drive is arranged on one side of a partition, comb and contacts are arranged on the other side of this partition. The invention particularly relates to a twin relay of this type. The twin relay is a safety relay with two independently acting electromagnetic drives. These drives are arranged on one side of a partition wall. On the other side of the partition wall correspondingly two combs and two rows of contacts are arranged.

In the WO 99/54905 describes a twin relay, which is about 15 mm high, 65 mm wide and 75 mm long, and its height is formed by two levels. On one level, eg on the side of the connections, there are two drive systems (polarized sliding anchors). In the other level, the contact sentences. In all embodiments, the contact springs of the contacts are parallel to the partition between the drive plane and the contact plane. In some embodiments, the contact sets are formed by two series connected contacts. These are each connected by one of the independent drives. The contacts are formed by two contact springs. The active or passive contact spring is guided over the entire width or length of the relay, clamped in the middle in a chamber partition wall and has a contact head at both ends. This contact head cooperates with a respective second contact spring. This second contact spring has at a distance from the relay edge a reaching on the outside of the relay connection.

In other embodiments, a contact set is formed by only two cooperating contact springs, each of which is movable by an independent drive. Their contact heads are arranged on a center line of the relay. These contact springs are forcibly guided with the comb. Both combs must each be moved in opposite directions. These sets of contacts achieve a double distance between the contact heads, but they can not serve the safety of the circuit. Namely, if welded contacts are not solved by this welding both combs and therefore all contacts are blocked. Location and design of drive with armature and comb is not shown.

Today, two mutually contradictory requirements are demanded of the relay, which must be considered in the development of new, marketable relays. On the one hand, relays must be smaller, and on the other hand remain permanent and secure. In a safety relay according to the EN 50205 standard, clearances and creepage distances between the control contact and the load contact comply with the requirements of IEC 61810-5 and IEC 664-1. The contents of these standards are assumed to be known to the person skilled in the art and form part of this application. Also between conductive parts of the different load contacts, the distances known to those skilled in the art as a function of voltage, degree of contamination and field of application must be observed. The security also serves the restraint of the contacts.

A positively driven relay is understood to be a relay in which the contacts are forcibly guided with a common, movable drive-connected comb and in which at least one make contact and one normally closed contact are provided. Forcibly guided means that in each case a contact element is present at a fixed stop and a cooperating with this contact element movable contact spring engages in the comb in such a way that it is necessarily moved with the movements of the comb. This ensures that when a contact welded, either the welded contact is torn apart, or the comb can not be moved and therefore the other contacts, including the normally closed contact, must remain in the given by the welding position.

It is therefore an object of the invention to provide a - preferably miniaturized - safety relay with a compact and simple design, in which a safe, permanent operation is guaranteed. In particular, the relay should be easy to assemble and optimally adjustable.

The adjustment of the contacts is an important prerequisite for ensuring the safety and durability of a relay. Sufficient adjustment of the contacts is the more difficult to achieve, the smaller the relay is and the smaller the sequence in which the balance in terms of force balance drive / suspension and spatial distances are selected. Therefore, high demands are placed on the adjustability of miniaturized relays.

The adjustability of the safety relay according to the preamble of claim 1, or the twin relay according to the preamble of claim 2 is achieved in that the contact springs between the comb and the partition between the drive side and contact side are arranged.

The safety relay has at least one electromagnetic drive which comprises at least one coil with core / yoke which can be connected to a control current and a movable armature. This drive is arranged on one side of a partition wall parallel to the core. A movable by means of the armature comb and a series of a plurality of arranged on an electrically insulating support member contacts are arranged on the other side of the partition wall. The contacts consist of at least two contact elements and can be actuated by the drive. At least one of the contact elements in each case is connected to a power connection element, e.g. connected to a pin on the outside of the relay. Likewise, in each case at least one of the contact elements, the same or a second, formed by an elongated contact spring. The spring longitudinal axis of this contact spring is arranged transversely to the direction of movement of the comb and parallel to the plane of the partition and the contact spring is forcibly guided by the comb. The contact spring is seated at one end with a spring foot in the support part. The spring foot opposite end is movable and provided with a contact head. For optimal construction of the relay, the contact springs between the comb and the partition wall are arranged. As a result, the length of the armature occupy the entire height of the relay, whereby a relatively large comb path is achieved with low height and small footprint of the relay.

Advantageously, the relay on the opposite side of the partition comb side of the contact springs with a removable Kontaktkammeraussenwand be closed. Thereby, the comb can be inserted into the carrier part after introduction of the contact elements, and is through the chamber outer wall in his held engaging position. The contacts can be operatively arranged in the unlocked relay. This arrangement ensures that the contacts can be optimally adjusted. When adjusting the contacts, these sit firmly in the carrier part, are not in engagement with the comb and are freely accessible from the closable through the chamber outer side. To check the adjustment of the comb can be used without the relay needs to be closed. Only after checking the adjustment of the comb is definitely used and placed the chamber outer wall and thus closed the relay.

Conveniently, the individual contacts are separated by chamber walls. Advantageously, the comb is formed by a guided through cutouts in the chamber walls longitudinal bar. This longitudinal bar can be guided next to the contact springs and by means of suitable formations on the rod with these engaged. Due to the drive arrangement, it is advantageously arranged centrally between the outer edges of the relay or relay part. To extend the air and creepage distances between contact elements of adjacent contacts in the region of the passage points of the rod shields are provided on the longitudinal bar. These shields project beyond the staff on at least three sides. They are arranged approximately parallel to the chamber walls. By overlapping the chamber walls with the shields, a labyrinthine extension of the air and creepage paths is achieved.

Advantageously, the point of engagement of the contact spring on the comb parallel to the spring longitudinal axis at a distance from the rod axis of the comb. Thanks to this distance, the longitudinal bar of the comb can be arranged centrally, while the point of engagement of the contact spring on the comb at a selectable distance to spring base and contact head can be determined.

Advantageously, the chambers and the coil occupy virtually the same footprint. This is accomplished by matching the dimensions of the drive and contacts such that the entirety of the chambers of the two-way actuated contacts have substantially the same dimensions as the coil associated with the contacts. This optimally utilized the space occupied. Despite reduced winding space height, the coil can be made relatively high-resistance thanks to its long length.

The chamber walls for separating adjacent chambers may be formed on the support member or on the chamber outer wall. Advantageously, they are formed on both parts, so that the air and creepage distances are extended by the overlap of both chamber walls.

Advantageously, at least a part of the contacts on two independent connection elements. Contacts with only one outwardly guided connection element are expedient only in the twin relay. These are connected in series with a second contact, which is actuated by a second coil. In the simple relay, all the contacts have two, or in the case of changeover contacts, three connection elements which are routed to the outside of the relay. Such non-double-connected contacts are particularly useful as a control contacts in a twin relay.

In an advantageous development of the invention, the contact springs between the contact head and the spring foot have a projection directed away from the partition wall and towards the comb side. At the extension a Kammansatzstelle is formed. With the comb attachment point, the contact spring is forcedly engaged with the comb. By forming a lateral extension of the contact spring of the comb between the head and foot end of the contact spring is used in addition to the extension. The contact spring may be cut in an area adjacent to the extension for the implementation of the comb. Thereby, the comb can be formed mirror-symmetrically to a plane perpendicular to the partition plane through the rod axis. The extension then engages in each case in one of the two provided for engagement training. This allows the use of a uniform comb even with twin relays of the type described below.

Advantageously, the comb attachment point, at which the contact spring is in engagement with the comb, is at a distance from the mechanical spring longitudinal axis. This can be achieved through the extension. The distance to the mechanical longitudinal axis causes a rotation of the contact spring when switching the contact, which has a favorable effect on the life of the contact head and thus on the durability of the relay.

Advantageously, the contact head is attached to its center by a selected Mass in addition to the mechanical spring longitudinal axis of the contact spring to this. This also causes Vertwistung of the spring and a care of the contact head during Switching the contact. This measure is advantageously smaller than the distance between the comb attachment point and the spring longitudinal axis.

In the direction of the spring longitudinal axis, the distance of the comb attachment point from the spring foot is expediently approximately twice as large as its distance from the center of the contact head in order to achieve good guidance and an optimal length of movement of the contact head.

Such a relay with six contacts can be built very small and yet meets the standards mentioned above. The connection contacts are on the side of the contacts and the drive lies over the contacts and occupies practically the entire length of the relay. The relatively large winding space allows an efficient drive with small coil losses. At the armature-side relay end, the connection contacts for the coil are provided.

The above applies also to a safety relay with two electromagnetic drives, i. a twin relay. These twin relays have each drive a connectable to a control current coil core and a movable armature. The coils are preferably aligned the same so that the anchors are on the same side. These drives are arranged on one side of a partition parallel to the cores, while each armature extends from this side to the other side of the partition. Two combs movable parallel to the dividing wall and two rows of several contacts arranged on an electrically insulating support part are arranged next to one another on the other side of the dividing wall. The contact springs are arranged with a longitudinal axis parallel to the partition wall. The combs are independently driven by one of the anchors. At least two of the independently actuated contacts are connected via a common contact element.

Also in this twin relay according to the invention the contact springs are arranged between the comb and the partition wall. In addition, advantageously, the contacts, which have only one connection element and are connected via a common contact element with a second such contact, arranged at the armature opposite end of the comb. As a result, a region of the relay which adjoins at least one relay edge and is preferably arranged in the middle under the relay is free of connection elements. This allows a connection cable too the connection elements of the contacts with two connection elements in the direction of movement of the comb under the relay.

Advantageously, the spring feet are arranged at mutually ends facing away from the contact springs guided forcibly by the combs of the contacts connected by a common contact element. Accordingly, the contact heads between the contact feet of the two independently driven and connected to a switching unit contact springs are arranged at mutually facing ends of the contact springs. This arrangement has the advantage that in this case the moving contact spring has the greatest possible length and the fixed common contact element can be formed as small as possible. Such a twin relay has twice the footprint of the simple relay.

Figur 1:

eine schematische, perspektivische Skizze eines erfindungsgemäss aufgebauten Relais,

Figur 2:

einen Schnitt durch Spule und Kontakte eines Relais mit sechs Kontakten,

Figur 3:

eine Ansicht des Relais von der Unterseite oder Anschlussseite

Figur 4:

einen Ausschnitt aus der Untersicht gem. Figur 3, jedoch mit einem symmetrischen Kamm,

Figur 5:

einen Ausschnitt aus einer Schnittzeichnung durch das Relais gemäss Figur 4,

Figur 6:

eine Ansicht der Unterseite oder Anschlussseiten eines erfindungsgemässen Zwillingsrelais.

In the following the invention will be explained in more detail with reference to schematic representations of exemplary embodiments. It shows

FIG. 1:

a schematic, perspective sketch of a relay constructed according to the invention,

FIG. 2:

a section through coil and contacts of a relay with six contacts,

FIG. 3:

a view of the relay from the bottom or connection side

FIG. 4:

a section from the bottom view gem. FIG. 3 but with a symmetrical comb,

FIG. 5:

a section of a sectional drawing through the relay according to FIG. 4 .

FIG. 6:

a view of the bottom or terminal sides of a twin relay according to the invention.

The inventively constructed relay 11 is in the FIG. 1 incomplete drawn. It has a drive 15 in a drive region 13 delimited by a dotted line. This lies on a first side of a substantially planar partition 17. The drive 15 has, as usual, a coil connected via two control connection pins 19 and can move a comb 23 with an armature 21. On the second, in the FIG. 1 upwardly directed side of the partition 17, the normally open contacts and control contacts are arranged. In the FIG. 1 is representative of a plurality of contacts a single pair of contact elements 25 with an engaging in the comb 23 contact spring 27 and immovable arranged second contact element 29. Both contact elements 27,29 each have a connection pin 31.

The coil of the drive 15 is arranged with its core parallel to the partition wall 17. The arranged on a short side of the relay 11 anchor 21 extends to the other side of the partition wall 17 and is there in engagement with the comb 23. The contact elements 27,29 are arranged directly adjacent to the partition wall 17 and on a partition 17 forming support member 33 attached. The comb 23 is arranged on the side facing away from the drive side of the contact elements 27,29. Thus, it is at a lying on his back and the terminal pins in the air stretching relay 11 on top. This allows the incorporation of the contacts 25 into the drive member 33 provided with the drive and their adjustment and control before the comb 23 is brought into engagement with the contact springs 27. For engagement, a slot 35 is provided in the comb 23, in which engages a protruding from the contact spring 27 in the direction of comb 23 extension. In FIG. 1 6 slots 35 are shown, so that 6 contact springs 27 can be moved with the comb 23.

In the FIG. 2 are the coil 37 with core 39 and yoke 41, the armature 21, the support member 33 with the partition wall 17, and the contact springs 27 and stationary contact elements 29 shown in a section. Further, the comb 23 in engagement with armature 21 and contact springs 27 is shown. All this is enclosed by a housing which consists of a cover 43 and a bottom part 45. These are hooked into each other. The support member 33 forms a container for receiving the drive 15 on one side of the partition 17. On the other side of the partition wall 17 it forms with chamber walls 47 against each other separated chambers 49 for the contacts 25. The chamber walls 47 and the entirety of the chambers 49th comprehensive peripheral wall 51 define with their dimensions all dimensions of the chambers. The bottom part 45 rests with its inside on the end faces of the chamber walls 47 and the peripheral wall 51. However, the bottom part 45 is in turn provided with chamber ribs 53, which come to lie in each case directly adjacent the chamber walls 47 when the relay 11 is closed. A bottom edge rib 55 includes the peripheral wall 51 and is latched with lugs 57 in the lid 43. The lid 43 in turn encloses all five, not covered by the bottom part 45 sides of the relay 11 and the bottom edge rib 55th

The chamber ribs 53 and the chamber walls 47 together form a labyrinthine extension of air and creepage paths between the contact elements 27,29 in adjacent chambers 49. Where the comb 23 pierces the chamber walls 47 and chamber ribs 53 would result in a shortened air and creepage distance, if not with a shield 59 on the crest of this in turn would be extended. The shield 59 protrudes to a the openings in the chamber walls and chamber ribs penetrating longitudinal bar 60 of the comb 23 to three sides. On the fourth side, namely the side directed towards the bottom part 45, a protrusion of the longitudinal bar 60 is not desirable for reasons of space. Therefore, the shield 59 is formed where necessary L-shaped and covers with a parallel to the bottom part 45 arranged shield member 61, the contact spring 27 from the bottom part 45 down from, so that there is reached a way extension.

Forced tabs 65 are formed on the shield members 61 or similar tabs 63 formed on the comb 23. These hold on the contact spring 27 formed projections 67 from two sides, so that the contact spring 27 has to join in each movement of the comb 23. The shield parts 61 are arranged symmetrically to the longitudinal bar 60 of the comb 23 in order to extend the air and creepage paths on both sides of the longitudinal bar equally. At the shield parts 61, the Zwangsmitnehmer 65 in the FIG. 2, 3 and 6 not symmetrical, but in the FIGS. 4 and 5 formed symmetrically. This symmetrical design allows the use of a single comb for both relays of a twin relay FIG. 6 ,

The armature 21 extends through an opening in the partition wall 17 into the immediate vicinity of the bottom part 45 (FIG. FIG. 2 ). There sits its end in a recess in the comb 23. The coil 37 is wound on a bobbin 69, which is penetrated by the core 39. Yoke 41 and core 39 are made together from one piece. In the bobbin 69 connecting pins are recessed, to which the coil winding wire is connected and which protrude through openings provided in the bottom part 45 of the housing.

Like from the FIG. 3 clearly visible, put the contact elements 27, 29 in designated clamping areas 71 in the support member 33. The contact springs 27 are folded on the spring foot 73 once and bent over in the double range by 90 °. With this angle part 75, they can be inserted from the comb side or from the open bottom into the pocket-like clamping region 71 in the carrier part 33. Likewise, that's solid Contact element 29 inserted into a kind of pocket 79. The connection pins protrude counter to the insertion direction of the contact elements 27,29 in the direction of the support member 33 can be placed on the bottom part 45. In the bottom part corresponding holes for the pins are provided.

An advantageous embodiment of the contact springs 27, the fixed contact elements 29 and the comb 23 is from the FIGS. 4 and 5 seen. The comb 23 is symmetrical there. Thus, the same comb 23 both in the in FIGS. 4 and 5 shown as well as in a mirror image executed relay to be used. The contact spring 27 is formed symmetrically with respect to the contact head 77. One side of the contact spring 27 is the preformed head portion of a contact head rivets and arranged on the other side of the contact spring 27 of the beaten headboard. The contact spring 27 is E-shaped with a spring member 80 along a mechanical longitudinal axis 81 and three transversely to the longitudinal axis 81 directed, formed on the same side of the spring member 80 protruding projections. The cross sections of an E corresponding projections are formed by the relative to the spring member 80 widened head portion 83, the Mitnehmerfortsatz 67 and the spring base 73 with terminal pin 31. With the spring foot 73, the distance between the spring member 80 and partition 17 is determined. The extension 67 is arranged near the head. The longitudinal bar 60 of the comb 23 extends between spring foot 73 and extension 67 next to the extension. The Zwangsmitnehmer 65 of the comb 23 are in engagement with the extension 67. When you open the contact actuation of the contact spring 27 via the asymmetrically arranged with respect to the longitudinal axis extension 81 Vertwistung of the spring member 80, because the center of the contact head 77 and the starting point of Zwangsmitnehmers 65 on the extension 67 have different distances from the mechanical longitudinal axis 81.

The fixed contact element 29 is formed by a nearly square shaped sheet metal part 85 with rivet head 87. The sheet metal part 85 also forms a connection pin 31 or, in a twin relay, a bridge 86 to the rivet head 87 in the second relay. The fixed contact element 29 or 86 is in a the edges of the sheet metal part 85, 85 'embracing pocket 79, 79' inserted.

This in FIG. 6 illustrated twin relay 89 is equipped with two mirror-image combs 23 and two different types of contact springs 27. The Spring parts 80 with spring foot 73, extension 67 and head section 83 are identical, but the contact head 77 is arranged at the one springs on the side on which the spring foot 73 is angled, in the other on the opposite side. Thanks to the correspondingly shaped Einspannbereichen 71 in the support member 33, the same contact spring 23, but with differently arranged or symmetrically formed head rivets, in both relays and for working and rest contacts usable.

The air and creepage paths between the contact elements 27,29 adjacent contacts is solved within each relay 11 exactly the same as a single relay. Through the path extensions by means of overlapping chamber walls 47 and chamber ribs 53 and the shields 59, a creepage distance between the contact springs 27 and the fixed contact elements 29 of the load contacts 91 of at least 8 mm is achieved in the interior of the relay. The distance between the pins and the airway in the interior meet under the load contacts 91, the norm of at least 5.5 mm. Between the load contacts 91 and the control contacts 93 the airway is extended to 8 mm for safe separation between the different voltage potentials of the load contacts 91 and the operated with safety extra-low voltage control contacts 93.

In addition, in the twin relay 89, both relays must keep distances from each other that meet the standards. For this purpose, in a two drives 15 and two rows of contacts 25 applied support member 33 between the two relays a labyrinthine toothing of cover 43 and support member 33 on the one hand and bottom part 45 and support member 33 on the other hand provided. The walls provided in the carrier part 33 for this toothing are broken only by the bridges forming two contact elements 25 common contact elements 86 and the adjacent chamber ribs 53.

In summary, in a relay 11, whether single relay or twin relay, a plastic molded support member 33 on one side of a partition encloses a drive and forms chambers 49 for the contacts 25 on the other side of the partition wall. These chambers 25 are open on the opposite side of the partition and closed by a bottom part 45. An arm movable comb 23 is disposed between bottom portion 45 and contacts 25. Movable contact springs 27 of the contacts 25 cross the comb 23 and are constrained by the comb. The contact springs 27 are all made uniform, no matter which side they are moved by the comb 23. The combs 23 are also made uniform, regardless of whether the movable heads of the contact springs 27 are arranged on one or the other side of the comb 23. The components of the relay are therefore ideal for the production of a twin relay. Thanks to the ground-level arrangement of the comb 23, the contact springs 27 are adjustable before the comb 23 is inserted. As a result, relay 11 can be produced with very small sized contact springs 27 and adjust reliable. Thanks to a meshing of bottom part 45 with chamber ribs 53 and support member 33 with chamber walls 47 are sufficiently long creepage distances and air gaps between the contact elements 27,29 in adjacent chambers 49 in a small space to achieve. In particular, the distances of the terminal pins from each other and the number of contacts 25 are decisive for the outer mass of the relay 11. In addition, the length of the contact springs 27 in relation to the minimum distance between the contact heads of an open contact 25 limiting, since the material properties of the contact spring 27 only within can be varied by borders. Thanks to the expansion of the coil 37 over the length of the entirety of the chambers 49, this can be operated with low power loss.

Directory of reference numbers

11

relay

13

driving range

15

drive

17

partition wall

19

Steueranschlusspins

21

anchor

23

Comb

25

Contact element couple, contact

27

Contact spring, contact element

29

solid contact element

31

connector pin

33

support part

35

slots

37

Kitchen sink

39

core

41

yoke

43

cover

45

the bottom part

47

chamber walls

49

chambers

51

peripheral

53

chamber ribs

55

Bottom edge rib

57

nose

59

sign

60

longitudinal bar

61

shield member

63

cloth

65

Zwangsmitnehmer

67

Extension, driver extension

69

coil carrier

71

clamping

73

spring foot

75

angle part

77

contact head

79, 79 '

bag

80

spring part

81

longitudinal axis

83

head part

85, 85 '

sheet metal part

86

Bridge, common
contact element

87

rivet head

89

twin relay

91

load contact

93

control contact

Claims (19)

1. A safety relay (11) comprising:

   an electromagnetic drive (15) located on one side of a separating wall (17) parallel to the axis of the core (39), said drive comprising:

   a coil (37) with core and yoke (39,41) and a movable armature (21), the coil (37) being connectable to a control current;

   on the other side of the separating wall (17) a plurality of contacts (25) positioned in a row, arranged on an electrically insulating carrier part (33), each contact comprising at least two contact elements (27,29), actuatable by the drive (15),

   the contact elements (27,29) being connected with a current connection element (31),

   at least one of the contact elements (27,29) being formed by an elongated contact spring (27)

   and the contact spring (27) sticking on one end with a spring foot (73) in the carrier part (33) and the end lying opposite said spring foot (73) being movable and provided with a contact head (77)

   a comb (23) movable parallel to the core axis by means of said core (21),

   whereby the longitudinal axis (81) of the contact spring (27) is arranged crosswise to the direction of the movement of the comb (23) and parallel to the separating wall (17), and

   the contact spring (27) being forcibly guided by the comb (23),

   characterised in that
   the contact springs (27) are arranged between the comb (23) and the separating wall (17).
2. A safety relay (11) comprising:

   two electromagnetic drives (15) located on one side of a separating wall (17) parallel to the axis of the core (39), said drive comprising:

   a coil (37) with core and yoke (39,41) and a movable armature (21), the coil (37) being connectable to a control current;

   on the other side of the separating wall (17) a plurality of contacts (25) positioned in two rows, arranged on an electrically insulating carrier part (33), each contact comprising at least two contact elements (27,29), actuatable by one of the two drives (15),

   the contact elements (27,29) being connected with a current connection element (31),

   at least one of the contact elements (27,29) being formed by an elongated contact spring (27)

   and the contact spring (27) sticking on one end with a spring foot (73) in the carrier part (33) and the end lying opposite said spring foot (73) being movable and provided with a contact head (77)

   two combs (23) movable parallel to the separation wall (17) by means of one of said cores (21),

   whereby the longitudinal spring axis (81) of the contact spring (27) is arranged crosswise to the direction of the movement of the comb (23) and parallel to the separating wall (17), and the contact spring (27) being forcibly guided by the comb (23),

   characterised in that
   the contact springs (27) are arranged between the comb (23) and the separating wall (17).
3. The safety relay of claim 2, characterized in that a common contact element (86) with two contact heads (87) forms a connection between one of the contact elements (86) of one of the contacts (25) actuated by one of the drives (15) and one of the contact elements (86) of one of the contacts (25) actuated by the other drive (15).
4. The safety relay of claim 3, characterized in that the contacts (25) arranged in one of the relais and having one current connection element only and being connected to such a contact in the other relay by a common contact element (86) are arranged on an end of the comb (23) opposite the armatures (21).
5. The safety relay of claim 2 to 4, characterized in that the spring feet (73) of the contact springs (27) forcibly guided by the combs (23) of the contacts (25) connected by a common contact element (86) are arranged at ends of the contact springs (27) turned away from one another and the contact heads (77) are arranged between the spring feet (73) at ends of the contact springs (27) turned toward one another.
6. The safety relay of one of claims 1 to 5, characterized in that a clamping region (71) for an L-shaped bent spring foot (73) of the contact spring (27) is symmetrically formed in the carrier part (33).
7. The safety relay of one of claims 1 to 6, characterized in that on a contact spring (27) two contact heads (77) are arranged opposite to each other on both sides of the contact spring (27).
8. The safety relay of one of claims 1 to 7, characterized in that the relay (11) is closable on a comb side opposite the separating wall (17) by a removable outer contact chamber wall (45).
9. The safety relay of one of claims 1 to 8, characterized in that between spring foot (73) and contact head (77) the contact springs (27) have a projection (67) directed away from the separating wall (17) towards a comb (23) for engagement with the comb (23).
10. The safety relay of one of claims 1 to 9, characterized in that the contact spring (27) is engaged with the comb (23) on an comb attachment place (67), which comb attachment place (67) is in a distance to a mechanical longitudinal spring axis (81).
11. The safety relay of one of claims 1 to 10, characterized in that the contact head (77) is attached to the contact spring (27) by its center and at a distance to the mechanical longitudinal spring axis (81) of the contact spring (27), this distance being smaller than the distance between the comb attachment place (67)and the mechanical longitudinal spring axis (81).
12. The safety relay of one of claims 1 to 11, characterized in that in direction of the longitudinal axis (81) the distance between the comb attachment place (67) on the projection and the spring foot (73) of the contact spring (27) is double the distance between the comb attachment place (67) and the center of the contact head (77).
13. The safety relay of one of claims 1 to 12, characterized in that individual contacts (25) are separated from one another by chamber walls (47).
14. The safety relay of one of claims 1 to 13, characterized in that the comb (23) has a longitudinal bar (60) guided through cutouts in the chamber walls (47) and shields (59) arranged parallel to the chamber walls (47) projecting over the longitudinal bar (60) on at least three sides for extending air and leakage paths between the contact elements (27, 29) of adjacent contacts (25).
15. The safety relay of one of claims 1 to 14, characterized in that an engagement place on the comb (23) for engagement with the contact spring (27) is placed at a distance to the longitudinal axis (81) of the comb (23), the distance directed parallel to the longitudinal axis of the contact spring (27).
16. The safety relay of one of claims 1 to 15, characterized in that the comb (23) is formed symmetrically to a plane lying perpendicular to the separating wall (17) and parallel to the movement direction of the comb (23).
17. The safety relay of one of claims 1 to 16, characterized in that the totality of chambers (49) for the contacts (25) actuated by one electromagnetic drive (15) have practically the same dimensions in two directions as the coil (37) assigned to the contacts (25), so that the chambers (49) and the coil (37) take up the same area.
18. The safety relay of one of claims 1 to 17, characterized in that said chamber walls or ribs (47, 53) are formed on the carrier part (33) and/ or the chamber outer wall (45).
19. The safety relay of one of claims 3 to 18 in connection with claim 2, characterized in that at least one part of the contacts (25) has two current connection elements (31).

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