|
(11) | EP 0 993 010 A3 |
| (12) | EUROPEAN PATENT APPLICATION |
|
|
|
|
|||||||||||||||||||||||
| (54) | Tap changer for electric transformers |
| (57) A tap changer (10) particularly for electric transformers, comprising a rod-like
body (11) which rigidly supports fixed pin-like contacts (13) arranged at right angles
and in series along the rod-like body, the rod-like body constituting a sliding guide
for a sliding block (12b) associated with actuation means which can be actuated by
the user, the sliding block having at least one support (14) for a corresponding pair
of skid-like movable contacts which are slideable on the fixed contacts (13) in mutually
opposite positions and are adapted to interfere with two of the fixed contacts (13)
alternately and in succession; the at least one support (14) comprises a base (16)
from which two mutually parallel walls (17) for sliding on the rod-like body protrude,
the base being shaped so as to form seats for the two movable contacts, each one of
the movable contacts being shaped so as to form at least one anchoring tab which is
shaped complementarily to a corresponding guide for retaining the base, a spring (23)
being provided which is shaped so as to have two pairs of arms which force the movable
contacts (15) toward each other. |