(19)
(11) EP 0 987 726 A3

(12) EUROPEAN PATENT APPLICATION

(88) Date of publication A3:
07.03.2001 Bulletin 2001/10

(43) Date of publication A2:
22.03.2000 Bulletin 2000/12

(21) Application number: 99118263.5

(22) Date of filing: 15.09.1999
(51) International Patent Classification (IPC)7: H01H 27/00, H01H 36/00
(84) Designated Contracting States:
AT BE CH CY DE DK ES FI FR GB GR IE IT LI LU MC NL PT SE
Designated Extension States:
AL LT LV MK RO SI

(30) Priority: 15.09.1998 IT VI980169

(71) Applicant: Pizzato Elettrica S.r.l.
36063 Marostica (Vicenza) (IT)

(72) Inventors:
  • Pizzato, Bernardo
    36063 Marostica (VI) (IT)
  • Pizzato, Giuseppe
    36063 Marostica (VI) (IT)
  • Pizzato, Marco
    36063 Marostica (VI) (IT)

(74) Representative: O'Byrne, Daniel 
c/o Maroscia & Associati S.r.l., Corso Palladio, 42
36100 Vicenza
36100 Vicenza (IT)

   


(54) Key-controlled safety switch


(57) A key-controlled safety switch assembly includes a box-like case (2) anchorable to a fixed part of a protection or barrier of a machine or installation and provided with one or more slots (5), an actuating key (3) anchorable to a moving part of the protection and insertable in any of the slots (5). The case (2) contains internally thereof a safety electric circuit (6) for selectively closing/opening a general relais or a safety switch of the machine or installation on insertion/extraction of actuating key (3), locking parts (9) for selectively locking the actuating key (3) in the inserted position in a slot (5) until the dangerous parts of the machine or installation are moving, a detecting device (13) for detecting the position of the key (3) to allow closing of the safety switch (6). The detecting device (13) is exclusively of the electronic type acting from distance, and the key (3) is shaped so as to enter freely in the slot (5) with a minimal predetermined clearance (s).






Search report