(19)
(11) EP 0 379 254 A3

(12) EUROPEAN PATENT APPLICATION

(88) Date of publication A3:
27.02.1991 Bulletin 1991/09

(43) Date of publication A2:
25.07.1990 Bulletin 1990/30

(21) Application number: 90200094.2

(22) Date of filing: 15.01.1990
(51) International Patent Classification (IPC)5: B06B 1/04, H02K 33/02
(84) Designated Contracting States:
DE ES FR IT NL

(30) Priority: 18.01.1989 IT 1911789

(71) Applicant: I.T.S. INTERNATIONAL TECHNICAL SERVICE S.R.L.
I-20028 San Vittore Olona (Milano) (IT)

(72) Inventor:
  • Dell'Acqua, Armando, I.T.S. International
    San Vittore Olona, Milano (IT)

(74) Representative: Raimondi, Alfredo, Dott. Ing. Prof. et al
Dott. Ing. Prof. RAIMONDI ALFREDO S.r.l. Piazzale Cadorna 15
20123 Milano
20123 Milano (IT)


(56) References cited: : 
   
       


    (54) Electromagnetic vibrator apparatus with adjustable elastic reaction


    (57) Electromagnetic vibrator apparatus, comprising a base (1) capable of being connected to an object to be set in vibration, an electromagnetic armature (3) integral with the base (1) and an electromagnet (4) facing the armature, and connected to the base by an elastic means (6), in which the elastic means connecting the base to the electromagnet is of constant stiffness, while between the electromagnet (4) and the base (1) there is interposed at least one adjusting unit (12), comprising elastic means (14) with adjustable prestress.







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