Vickers Systems Limited

Andrew P Wheadon

A lockable adjustment mechanism (1) for an adjustable component (2), the adjustment mechanism (1) comprising a first rotatable body portion (3) adapted in use to receive and be attached to a threaded elongated adjustment member (4) of the adjustable component (2), a second non-rotatable body portion (5) attachable to the adjustable component (2) and through which the threaded adjustment member in use passes, means (7, 9) for retaining a selected relative position between the first and second body portions, a third body portion (13) rotatably mounted on the first body portion (3) and lock means (17) operable to lock the third body portion (13) to the first body portion (3), rotation of the third body (13) effecting rotation of the first body portion (3) when locked thereto and thus effecting longitudinal movement of the adjustment member (4) of the adjustable component (2), the third body portion (13) being freely rotatable when not locked to the frist body portion (3) so as not to have any effect on the setting of the adjustment member (4).

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Copnor, United Kingdom

Andrew P Wheadon