Bounce-reduced relay

Information

  • Patent Grant
  • 6661319
  • Patent Number
    6,661,319
  • Date Filed
    Thursday, December 5, 2002
    22 years ago
  • Date Issued
    Tuesday, December 9, 2003
    21 years ago
  • Inventors
  • Original Assignees
  • Examiners
    • Enad; Elvin
    • Rojas; Bernard
    Agents
    • Hackler; Walter A.
Abstract
A relay includes a contact spring which closes or interrupts an electric circuit between a first and a second relay contact. One end of the contact spring is conductively connected to the first relay contact and another free end of the contact spring closes or interrupts the electric circuit in a first end position of the contact spring and in a second end position of the contact spring, respectively. An armature is provided which can be adjusted by a reversible magnetic field for deflecting the contact spring into the respective end position. An additional spring is provided for biasing the contact spring into the first end position, wherein the additional spring is supported, at least in the first end position, on the armature or on an actuator of the armature.
Description




This application claims Paris Convention Priority of DE 101 62 585.5 filed Dec. 19, 2001, the complete disclosure of which is hereby incorporated reference.




BACKGROUND OF THE INVENTION




The invention concerns a relay comprising a contact spring which closes or interrupts the electric circuit between a first and a second relay contact, one end of the contact spring being conductively connected to the first relay contact and its other free end closing or interrupting the electric circuit in a first end position of the contact spring and in a second end position of the contact spring, respectively; an armature which can be adjusted by a reversible magnetic field for deflecting the contact spring into the respective end position; and an additional spring biasing the contact spring into the first end position.




A relay of this type is known e.g. from DE 93 20 696 U1.




In this known relay, an electric circuit between two electric relay contacts is closed or interrupted by a contact spring. The contact spring is connected to a permanent magnet of an H-type armature via a displaceable actuator, the permanent magnet being pivotably disposed on two yoke legs of a magnet coil. When the poles of the magnet coil are reversed, the permanent magnet is pivoted thereby displacing the actuator. Since the actuator engages behind the contact spring, the contact spring is deflected from its closed rest position such that the electric circuit is interrupted. The free end of the contact spring is biased towards the closed end position through a leaf spring which is mounted on the side of the housing and acts on an actuating button of the contact spring.




It is the object of the invention to bias the contact spring of a relay of the above-mentioned type in a different fashion in the direction towards the closed end position.




SUMMARY OF THE INVENTION




This object is achieved in accordance with the invention in that the additional spring is supported, at least in the first end position, on the armature or on an actuator of the armature.




The advantage obtained by the invention consists in bounce-reduced switching of the relay into the closed relay position since the additional spring counteracts deflection of the contact spring in the opening direction when the relay is in the closed position.




The additional spring is mounted to the armature or to the actuator of the armature or in particularly preferred embodiments of the invention to the contact spring, in particular to its free end.




The additional spring is preferably a flat or leaf spring from electrically conducting material such as e.g. steel, beryllium, Cu-alloys etc.




In one variant of the invention, the free end of the additional spring is directed towards the free end of the contact spring. The free end of the additional spring preferably projects past the free end of the contact spring.




In other variants of the invention, the free end of the additional spring can also project laterally past the contact spring or be directed away from the free end of the contact spring.




The actuator is preferably disposed such that it can be linearly displaced approximately in the deflecting direction of the contact spring and is motionally coupled to the free end of the contact spring.




In preferred embodiments of the invention, the contact spring is directly coupled with the armature or the actuator of the armature in the opening direction of the relay, and is motionally coupled thereto in the closing direction of the relay via the additional spring. In one variant, the actuator engages behind the free end of the contact spring and carries along the contact spring in the opening direction.




In a preferred embodiment of the invention, the actuator is directly hinged to the armature and therewith directly motionally coupled to the armature. The pressure of the contact spring on the second relay contact is provided by the pressure force of the compressed additional spring.




In another preferred embodiment of the invention, the actuator is motionally coupled with the armature by means of a coupling spring acting therebetween. The pressure of the contact spring on the second relay contact is provided by the pressure of the compressed additional spring and the compressed coupling spring.




Further advantages of the invention can be extracted from the description and the drawing. The features mentioned above and below can be utilized in accordance with the invention either individually or collectively in any arbitrary combination. The embodiments shown and described are not to be understood as exhaustive enumeration but rather have exemplary character for describing the invention.











BRIEF DESCRIPTION OF THE DRAWINGS





FIG. 1

shows an interior view of the inventive relay in the closed relay position in which a contact spring closes the electric circuit between two relay contacts, with removed cover;





FIG. 2

shows the relay of

FIG. 1

in the open relay position in which the contact spring interrupts the electric circuit between the two relay contacts;





FIG. 3

shows an additional spring of the relay of

FIGS. 1 and 2

disposed on the contact spring;





FIG. 4

shows an arrangement variant of the additional spring in a representation analog to

FIG. 3

;





FIG. 5

shows another arrangement variant of the additional spring in a representation analog to

FIG. 3

;





FIG. 6

shows a second embodiment of the inventive relay in the closed relay position; and





FIG. 7

shows the relay of

FIG. 6

in the opened relay position.











DETAILED DESCRIPTION




The relay


1


shown in

FIGS. 1 and 2

comprises two relay contacts


2


,


3


and a contact spring


4


which closes or interrupts the electric circuit between the two relay contacts


2


,


3


and is formed as electrically conducting leaf or flat spring. One end of the contact spring


4


is mounted in an electrically conducting fashion to the first relay contact


2


while the other free end


5


bears a contact button


6


and can be deflected by means of a magnetic drive


7


. The contact spring


4


is deflected to the bottom in the closed relay position shown in

FIG. 1

such that the contact button


6


abuts the second relay contact


3


and is deflected in the open relay position shown in

FIG. 2

such that the contact button


6


is lifted from the second relay contact


3


.




The magnet drive


7


comprises a reversible magnet coil


8


having an iron core with two yoke legs


9


pivotably holding an armature


10


with a permanent magnet (not shown). The permanent magnet is disposed between two armature plates


11


which each abut the yoke legs


9


in the two switching positions of the armature


10


. The magnet coil


8


and the armature


10


which can be pivoted between its two switching positions form an H-type armature pull.




An actuator


13


formed as one-piece arm is hinged to a projecting arm


12


of the armature


10


, wherein the actuator


13


is disposed such that it can be linearly displaced in the deflecting direction (double arrow


14


) of the contact spring


4


. The actuator


13


engages with a projection


15


below the free end


5


of the contact spring


4


whereby the actuator


13


carries along or deflects the contact spring


4


in the opening direction of the relay


1


i.e. upwardly. The contact spring


4


is motionally coupled to the actuator


13


in the closing direction, i.e. downwardly, by means of an additional spring


16


supported on the actuator


13


. In the embodiment shown, the additional spring


16


is formed as leaf spring which is mounted by means of a rivet


17


on top of the contact spring


4


, shown in

FIG. 3

, and whose free end


18


cooperates with a downwardly directed projection


19


of the actuator


13


. As shown in

FIG. 3

, the free end


18


of the additional spring


16


projects past the free end


5


of the contact spring


4


in the longitudinal direction, i.e. in the direction away from the first relay contact


2


.




For switching the relay


1


, the magnetic field of the magnet coil


8


is reversed thereby pivoting the armature


10


and displacing the actuator


13


. In the closed relay position (FIG.


1


), the actuator


13


is displaced downwardly by the downwardly pivoted arm


12


, whereby also the contact spring


4


is deflected downwardly via the additional spring


16


until its contact button


6


abuts the second relay contact


3


. The pressure of the contact button


6


on the second relay contact


3


is provided by the pressure of the additional spring


16


compressed by the actuator


13


. In the open relay position (FIG.


2


), the actuator


13


is displaced upwardly through the upwardly pivoted arm


12


thereby carrying along the contact spring


4


from the projection


15


of the actuator


13


and lifting the contact button


6


from the second relay contact


3


.




In the variant shown in

FIG. 4

, the free end


18


of the additional spring


16


which cooperates with the actuator


13


projects laterally past the free end


5


of the contact spring


4


.




In the variant of

FIG. 5

, the free end


18


of the pressure spring


16


is directed away from the free end


5


of the contact spring, i.e. in a direction back to the first relay contact


2


, for cooperation with the actuator


13


.




In the relay


1


of

FIGS. 6 and 7

, the actuator


20


which cooperates with the contact spring


4


is shorter and is motionally coupled to the arm


12


via a coupling spring


21


which is supported between the actuator


20


and the arm


12


. In the closed relay position (

FIG. 6

) the actuator


20


is displaced downwardly by the downwardly pivoted arm


12


and the coupling spring


21


, whereby the contact spring


4


is also deflected downwardly through the additional spring


16


until the contact button


6


abuts the second relay contact


3


. The pressure of the contact button


6


on the second relay contact


3


is provided by the pressure of the two compressed springs


16


,


21


. In the open relay position (FIG.


7


), the actuator


20


is pulled upwards by the upwardly pivoted arm


12


via the coupling spring


21


whereby the contact spring


4


is carried along from the projection


15


of the actuator


13


and the contact button


6


is lifted from the second relay contact


3


.



Claims
  • 1. Relay comprising a contact spring which closes or interrupts an electric circuit between a first and a second relay contact, one end of the contact spring being conductively connected to the first relay contact and its other free end closing or interrupting the electric circuit in a first end position of the contact spring and in a second end position of the contact spring, respectively; an armature which can be adjusted by a reversible magnetic field for deflecting the contact spring into the respective end position; and an additional spring biasing the contact spring into the first end position, wherein the additional spring is supported, at least in the first end position, on the armature or on an actuator of the armature and mounted to a free end of the contact spring.
  • 2. Relay according to claim 1, wherein the additional spring is mounted to the armature or to the actuator.
  • 3. Relay according to claim 1, wherein the additional spring is formed as leaf spring.
  • 4. Relay according to claim 3, wherein the free end of the additional spring is directed towards the free end of the contact spring.
  • 5. Relay comprising a contact spring which closes or interrupts an electric circuit between a first and a second relay contact, one end of the contact spring being conductively connected to the first relay contact and its other free end closing or interrupting the electric circuit in a first end position of the contact spring and in a second end position of the contact spring, respectively; an armature which can be adjusted by a reversible magnetic field for deflecting the contact spring into the respective end position; and an additional spring biasing the contact spring into the first end position, wherein the additional spring is supported, at least in the first end position, on the armature or on an actuator of the armature and wherein a free end of the additional spring projects past the free end of the contact spring.
  • 6. Relay according to claim 3, wherein the free end of the additional spring projects laterally past the contact spring.
  • 7. Relay according to claim 3, wherein the free end of the additional spring is directed away from the free end of the contact spring.
  • 8. Relay according to claim 1, wherein the actuator is disposed such that it can be linearly displaced in the direction of the contact spring.
  • 9. Relay according to claim 3, wherein the contact spring is coupled directly to the armature or the actuator in the opening direction of the relay and is motionally coupled via the additional spring in the closing direction of the relay.
  • 10. Relay according to claim 1, wherein the actuator is directly hinged to the armature.
  • 11. Relay according to claim 1, wherein the actuator is motionally coupled to the armature via a coupling spring acting therebetween.
  • 12. Relay comprising a contact spring which closes or interrupts an electric circuit between a first and a second relay contact, one end of the contact spring being conductively connected to the first relay contact and its other free end closing or interrupting the electric circuit in a first end position of the contact spring and in a second end position of the contact spring, respectively; an armature which can be adjusted by a reversible magnetic field for deflecting the contact spring into the respective end position; and an additional spring biasing the contact spring into the first end position, wherein the additional spring is supported, at least in the first end position, on the armature or on an actuator of the armature the additional spring being formed as leaf spring, the actuator being disposed such that it can be linearly displaced in the direction of deflection of the contact spring, and the actuator is directly hinged to the armature.
  • 13. Relay according to claim 1, wherein the additional spring is mounted to the armature or to the actuator, the additional spring is formed as leaf spring, the actuator is disposed such that it can be linearly displaced approximately in the direction of deflection of the contact spring, and wherein the actuator is motionally coupled to the armature via a coupling spring acting therebetween.
  • 14. Relay according to claim 1, wherein the additional spring is mounted to the armature or to the actuator, the additional spring is as leaf spring, the contact spring is coupled directly to the armature or the actuator in the opening direction of the relay and is motionally coupled via the additional spring in the closing direction of the relay, and wherein the actuator is directly hinged to the armature.
  • 15. Relay according to claim 1, wherein the additional spring is mounted to the armature or to the actuator, the additional spring is formed as leaf spring, the contact spring is coupled directly to the armature or the actuator in the opening direction of the relay and is motionally coupled via the additional spring in the closing direction of the relay, and wherein the actuator is motionally coupled to the armature via a coupling spring acting therebetween.
Priority Claims (1)
Number Date Country Kind
101 62 585 Dec 2001 DE
US Referenced Citations (9)
Number Name Date Kind
4092620 Schuessler et al. May 1978 A
4701734 Nakano et al. Oct 1987 A
4956623 Kimpel Rolf-Dieter Sep 1990 A
5329265 Guidi et al. Jul 1994 A
5534834 Hendel Jul 1996 A
5703549 Guidi et al. Dec 1997 A
5892423 Haas et al. Apr 1999 A
6426689 Nakagawa et al. Jul 2002 B1
20020050885 Gruner May 2002 A1
Foreign Referenced Citations (1)
Number Date Country
93 20 696.8 Oct 1994 DE