Locking and unlocking device

A device for locking or unlocking a member, comprising:

• a bolt (1) slidably mounted within a body (2) and actuated by a first electromagnet (13) allowing said bolt to co-operate with a notch or keeper (3) provided within a member;
• a second electromagnet (18) acting upon said bolt in order to block said bolt within said body when said bolt is in an inserted or non-inserted position within said keeper (3);
• said bolt (1) comprising a rear part (8) having on its periphery two spaced annular grooves (15, 16) whereas said second electromagnet (18) includes one core (17) co-operating with said grooves to block said bolt in said inserted or non-inserted position, respectively;
• said bolt (1) comprises a bored hollow forward end (10) adapted to co-operate with said keeper (3) and movably mounted within said body (2) with respect to said rear part (8) whereas said first electromagnet (13) includes one core or rod (11) secured to and extending through the rear part (8) of the bolt and having a free end adapted to slide within said hollow forward end (10);
• and
• said free end comprises a stop member (12) slidably mounted in the bore (10a) of said forward end (10), whereas a spring (R.sub.1) is provided in said bore around said rod (11) between said stop member (12) and a rear portion (10b) said forward end to constantly act upon the latter in a position bearing against said stop member;
• whereby inconveniences resulting from jamming and misalignment of the bolt with respect to the member to be locked are eliminated.