EP1455373B1 - Relay contact assembly - Google Patents

Relay contact assembly Download PDF

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Publication number
EP1455373B1
EP1455373B1 EP04003663A EP04003663A EP1455373B1 EP 1455373 B1 EP1455373 B1 EP 1455373B1 EP 04003663 A EP04003663 A EP 04003663A EP 04003663 A EP04003663 A EP 04003663A EP 1455373 B1 EP1455373 B1 EP 1455373B1
Authority
EP
European Patent Office
Prior art keywords
contact
spring
contact spring
actuator
assembly
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.)
Expired - Lifetime
Application number
EP04003663A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP1455373A1 (en
Inventor
Herbert Elsinger
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Panasonic Electric Works Europe AG
Original Assignee
Panasonic Electric Works Europe AG
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Panasonic Electric Works Europe AG filed Critical Panasonic Electric Works Europe AG
Priority to SI200430010T priority Critical patent/SI1455373T1/sl
Publication of EP1455373A1 publication Critical patent/EP1455373A1/en
Application granted granted Critical
Publication of EP1455373B1 publication Critical patent/EP1455373B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H50/00—Details of electromagnetic relays
    • H01H50/54—Contact arrangements
    • H01H50/56—Contact spring sets
    • H01H50/58—Driving arrangements structurally associated therewith; Mounting of driving arrangements on armature

Definitions

  • the contact spacing for a single interruption has to be at least 0.5 mm, and for a double interruption at least 0.3 mm.
  • the actuator 11 holds the contact spring 13 extending through the actuator slit 12 in an open state, in which the contact piece 15 located at the free end of the contact spring 13 is held in a distance from the counter contact 16.
  • the contact spring 13 is a mechanically biased flat spring, the foot of which is riveted, or fixed otherwise, to a terminal 14.
  • Fig. 5B illustrates such an incident.
  • the loose and relaxed contact spring 13 has moved to the other face of the terminal 14 and is contacting there. This means a single interruption in the contact region for which the required minimum distance of 0.5 mm to the counter contact 16 is not observed, as indicated by 17 .
  • Fig. 5C shows a case in which the loose contact spring 13 is displaced in its longitudinal direction. Again, the foot of the spring 13 has contact to the terminal 14. In this position, a recess 18 of the contact spring 13 is located within the actuator slit 12 and the contact spring 13 can rotate about its longitudinal axis such that the required minimum distance to the counter contact 16 is again not observed at the sites 19 .
  • Fig. 6 A known measure to avoid the case described with reference to Fig. 5C is shown in Fig. 6.
  • the freedom of motion of the spring is restricted by a mushroom-shaped spacer 20 opposite to the free end of the spring.
  • the spacer 20 prevents the recess 18 of the contact spring 13 from reaching the region of the actuator 11 , i.e. the position which allows a maximum rotation of the contact spring 13 .
  • EP-B-1 121 701 discloses a relay in which the actuator comprises a window for the contact spring and a blocking wall, which effect that in case of a breakage, the spring is caught by the actuator. This avoids the danger of a short circuit potentially produced when the broken spring falls into the neighbouring chamber.
  • the present invention has the general object to avoid at least partially the drawbacks of conventional contact assemblies, and particularly to provide a relay contact assembly which ensures a safety contact spacing in case of a spring breakage without impairing the lifetime. It is further desired to keep the constructive and manufacturing expenditure as small as possible.
  • the element restricting the freedom of motion of the broken or loose contact spring has the form of a rib positioned to tilt the loose spring in such a way that it moves away from the counter contact.
  • the modification of the invention according to claim 3 relates to the case that the contact spring is operated by the actuator in a slit and hence from two sides.
  • the actuator slit and the rib cooperate to restrict the freedom of motion of the broken or loose contact spring in the intended manner.
  • the rib extends transversely to the contact spring and across the complete width thereof such that the contact spring cannot evade.
  • FIG. 1A to 4B show cross-sections through contact assemblies according to four embodiments.
  • Figs. 1A to 2B corresponds in its general assembly to the state of the art explained with reference to Figs. 5A to 5C, such that the description of corresponding parts is not repeated.
  • two ribs 22, 23 are provided in the region between the terminal 14 of the contact spring 13 and the actuator 11.
  • the ribs are located at the side which is not facing the counter contact 15 and extend towards the contact spring 13.
  • the ribs 22, 23 are preferably made of plastics and integrally formed with the relay base or the housing cap.
  • Fig. 1A shows an operative contact assembly in the open state.
  • the ribs 22, 23 protrude towards the contact spring 13 but do not contact it in any moment of the switching movement.
  • Fig. 1B shows a contact assembly in the same actuator state which correspond to the open contact state in case of an abnormal incidence.
  • the loose contact spring 13 is in a position which shows a double interruption. In this state, the ribs 22, 23 prevent the loose contact spring from reaching the other side of the terminal 14 .
  • the rib 23 and the actuator slit 12 effect that the contact spring 13 is kept in a distance from the terminal 14 as well as from the counter contact 16 .
  • the minimum distance of 0.3 mm is observed, even if the contact spring 13 is rotated about its longitudinal axis as indicated in Fig. 1B.
  • the embodiment according to Figs. 2A and 2B provides two further ribs 24 , 25 in addition to the ribs 22, 23 on the opposite side of the contact spring 13 .
  • the ribs 24, 25 protrude towards the contact spring 13 without actually contacting it in any moment of the switching movement.
  • Fig. 2A the operative contact spring 13 is shown simultaneously in closed and open state without actuator so that the bending behaviour of the contact spring 13 is visible for both states. It is shown that the position of the contact spring 13 close to the terminal 14 hardly differs in the two states. Therefore, the spacing between ribs 22 and 24 can be made smaller than between ribs 23 and 25 which hinders a rotation of the contact spring 13 (as in Fig. 1B).
  • Fig. 2B shows a possible state of a loose contact spring 13 in an abnormal incidence with double interruption.
  • the rib 23 and the actuator slit 12 effect that the minimum distance of 0.3 mm is observed between the foot of the contact spring 13 and the terminal 14 as well as between the contact piece 15 and the counter contact 16 .
  • Figs. 3A and 3B shows that a single rib 23 located in the middle between the terminal 14 and the actuator 11 is sufficient for effectively keeping the relay in fail safe condition in case of a spring breakage.
  • a single rib 23 is positioned on the side of the contact spring 13 which is not facing the contact piece 15.
  • the upper part of Fig. 3B shows a possible state of a broken contact spring 13 in an abnormal incidence with single interruption.
  • the rib 23 cooperates with the actuator 11 to ensure that the minimum distance of 0.5 mm is observed between the contact piece 15 and the counter contact 16, while the broken end of the spring contacts the terminal 14 .
  • Fig. 3B shows a contact assembly which is axially symmetric to the one in the upper part.
  • the lower contact is in open state when the upper contact is in closed state and vice versa. It can be seen that the rib 23 does not affect the normal switching operation and has no influence on the contact spring 13 in the closed state.
  • Figs. 4A and 4B relate to a relay contact assembly in which the contact spring 13 is forcibly operated by the actuator 11a with the contact spring 13a and by the actuator 11b with the contact spring 13b, as it is principally known from DE-C-101 01 751.
  • Fig. 4A illustrates the open state and Fig. 4B the closed state of the relay.
  • the NC-contact spring 13 cannot be operated in a narrow actuator slit as this has been the case with the NO-contact springs 13a, 13b or with the contact spring 13 in the assemblies according to Figs. 1A to 2B. Therefore, the freedom of motion of the contact spring 13 in longitudinal or rotational direction is not sufficiently restricted by the actuator 11a and 11b .
  • a shoulder 26 is integrally formed with the basis of the relay.
  • the shoulder 26 practically replaces the missing side of the actuator slit.
  • a rib 23 integrally formed with the housing cap may enhance the safety in the way known from Figures 1B, 2B and 3B.
  • the shown assembly of the shoulder 26 provides the additional advantage that a vagabonding contact spring 13 faces the rib 23 with a broad portion even if the spring is displaced in the direction of the counter contact 16 , with the effect that the rotation about the longitudinal axis is further restricted.

Landscapes

  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Contacts (AREA)
  • Coupling Device And Connection With Printed Circuit (AREA)
  • Push-Button Switches (AREA)
  • Switches With Compound Operations (AREA)
  • Percussion Or Vibration Massage (AREA)
  • Details Of Connecting Devices For Male And Female Coupling (AREA)
EP04003663A 2003-03-05 2004-02-18 Relay contact assembly Expired - Lifetime EP1455373B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
SI200430010T SI1455373T1 (sl) 2003-03-05 2004-02-18 Kontaktni sklop releja

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE10309596A DE10309596B3 (de) 2003-03-05 2003-03-05 Relais-Kontaktanordnung
DE10309596 2003-03-05

Publications (2)

Publication Number Publication Date
EP1455373A1 EP1455373A1 (en) 2004-09-08
EP1455373B1 true EP1455373B1 (en) 2005-10-19

Family

ID=32797817

Family Applications (1)

Application Number Title Priority Date Filing Date
EP04003663A Expired - Lifetime EP1455373B1 (en) 2003-03-05 2004-02-18 Relay contact assembly

Country Status (6)

Country Link
EP (1) EP1455373B1 (sl)
AT (1) ATE307383T1 (sl)
DE (2) DE10309596B3 (sl)
DK (1) DK1455373T3 (sl)
ES (1) ES2249742T3 (sl)
SI (1) SI1455373T1 (sl)

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2817036C2 (de) * 1978-04-19 1983-08-11 E. Haller & Co, 7209 Wehingen Kontaktfederblock für Relais
DE2904677A1 (de) * 1979-02-08 1980-08-14 Haller & Co E Relais-federsatz mit rueckstellelement
DE3402650A1 (de) * 1984-01-26 1985-08-01 Hengstler GmbH, Geschäftsbereich Haller-Relais, 7209 Wehingen Kontaktfederbock fuer relais mit gehaeusekappe
DE3942340A1 (de) * 1989-12-21 1991-06-27 Hengstler Bauelemente Elektromagnetisches relais mit rueckstellfeder
WO2000024020A1 (de) * 1998-10-16 2000-04-27 Tyco Electronics Gmbh Sicherheitsrelais
DE10101751C1 (de) * 2001-01-16 2002-11-14 Matsushita Electric Works Europe Ag Kontaktsystem für elektromagnetisches Relais

Also Published As

Publication number Publication date
ES2249742T3 (es) 2006-04-01
DE10309596B3 (de) 2004-12-30
DE602004000136T2 (de) 2006-07-27
EP1455373A1 (en) 2004-09-08
SI1455373T1 (sl) 2006-04-30
DK1455373T3 (da) 2005-11-07
ATE307383T1 (de) 2005-11-15
DE602004000136D1 (de) 2005-11-24

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