(19)
(11) EP 0 320 929 A3

(12) EUROPEAN PATENT APPLICATION

(88) Date of publication A3:
29.08.1990 Bulletin 1990/35

(43) Date of publication A2:
21.06.1989 Bulletin 1989/25

(21) Application number: 88120979.5

(22) Date of filing: 15.12.1988
(51) International Patent Classification (IPC)4H01H 83/22, H01H 83/04, H01H 71/50
(84) Designated Contracting States:
AT BE CH DE ES FR GB GR IT LI LU NL SE

(30) Priority: 17.12.1987 IT 2306987

(71) Applicant: ABB Elettrocondutture S.p.A.
I-20127 Milano (IT)

(72) Inventor:
  • Monterosso, Raffaello
    I-20060 Cassina de Pecchi Milan (IT)

(74) Representative: Modiano, Guido, Dr.-Ing. et al
Modiano & Associati S.r.l. Via Meravigli, 16
20123 Milano
20123 Milano (IT)


(56) References cited: : 
   
       


    (54) Device for releasing the contacts of differential switches


    (57) This device comprises:
    - a first lever (7,7a,7b) having a first arm (7) actuated by the release device, and a second arm (7a) acting on an engagement element (10),
    - a second lever having a first arm (11,11a) engageable with said engagement element (10) and a contrast arm (11e) acting on a biasing spring (3),
    - a third lever rigidly associated with a resetting knob and having a first arm loading said spring upon each resetting and a second arm (12) in contact with the contrast arm and connected to a pusher rod (13) for actuating a release lever (14),
    - a connecting rod (15) pivoted to the knob (1) and said contrast arm (11e) for keeping the second lever in position after each resetting, so that upon each actuation of the first lever (7), the second lever (11,11a,11e) is disengaged from the engagement element (10) and can rotate freely, the third lever (12,12a,12b) rotates under the thrust of the preloaded spring (3) and the connecting rod (13) moves towards the switch release lever (14), thus causing contact opening.







    Search report