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(11) | EP 0 981 138 A3 |
| (12) | EUROPEAN PATENT APPLICATION |
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| (54) | Electromagnetic arrangements |
| (57) An electromagnetic arrangement comprises an armature (12) mounted within a housing
(5) and carrying an electrically energisable coil (14). A core (8) slides inwardly
of a hollow space (10) against a compression spring (18) in response to electrical
energisation of the coil (14), and slides in the opposite direction upon de-energisation
of the coil in response to the stored energy of the spring (18). The core (8) is connected
to an output member (6) by means of a control rod (24) freely slidable through the
core (8) and which has an enlarged head (27) against which a second coil spring (28)
acts. During inward movement of the core (8) in response to energisation of the coil
(14), the core (8) pulls the output member (6) through the intermediary of a second
spring (28) and a control rod (24) which is slidable through the core (8) and is fixed
to the output member (6). During outward movement of the core (8) in response to de-energisation
of the coil (14), an end face (15) of the core (8) pushes on an end face (26) of the
output member (6). When the core (8) is at its innermost position, a predetermined
amount of play (32) exists between the end (15) of the core (8) and the end face (26)
of the output member (6). This allows the core (8) to accelerate before it abuts against
the end face (26) of the output member (6). |