Patent ID: 8083274

Claim:
A mechanism comprising a rod operated by a rod spring and having a recess, a latching member engageable in the recess to block motion of the rod, a release member retaining the latching member engaged in the recess in a first position of the release member and allowing the latching member to be disengaged from the recess in a second position of the release member, the release member being formed as a collar surrounding the rod and slidable with respect thereto and having a release recess for receiving the latching member in the second position of the release member, a magnet for retaining the release member in the first position, a biasing element for urging the release member to the second position, an annular member through which the rod is arranged to move, the annular member including a through-hole containing a part of the latching member, and an element configured to apply a magnetic flux opposed to a magnetic flux exerted by the magnet so as to reduce net magnetic flux at least such that the release member moves to the second position, the latching member is disengaged from the recess and the rod moves axially by spring force.