This invention comprises a self-centering mechanism for retaining an object, a clamping device for retaining an electronic device or an electronic device in a case, and means to integrate the devices in an adapter form. The structure of the self-centering mechanism allows for a compact device that is capable of fitting a wide range of differently sized and shaped objects. The clamping device allows for means to retain an electronic device or an electronic device in a case that is capable of fitting a wide range of differently sized and shaped electronic device. The self-centering mechanism and clamping device can also be integrated into the form of an adapter for various applications.

This invention concerns a support structure for releasably clamping onto a body relative to a central axis in use, wherein the support structure comprises a plurality of links connected at a plurality of pivots spaced about the axis and an array of contact members depending from the links at angularly spaced locations about the axis, whereby pivoting of the links causes actuation of the contact members in a substantially radial direction relative to the axis such that said contact members communicate an applied contact force about the body in use so as to clamp the support structure to the body via the array of contact members.