Extension device for mounting in automobile cigarette lighter holder

An extension device adapted to be mounted to an automobile cigarette lighter holder which comprises a bore having an electrical negative contact located at a bottom of the bore and an electrical positive contact defined on an inner side surface of the bore, the extension device comprising an adaptor sized and configured to be fit into the bore of the cigarette lighter holder and an end holder mechanically coupled to the adaptor to be rotatable relative thereto about at least a first and a second axes so as to support an article on the cigarette lighter holder in a spatial location adjustable manner, the adaptor comprising a body having a proximal end and a distal end with a side surface extending therebetween, a plurality of flutes being provided on the side surface of the adaptor and extending in a first direction from the distal end to the proximal end, the adaptor comprising a plurality of strip-like members made of a resilient material received within the flutes, each of the strip-like members having an inward bent portion provided at a proximal end thereof and defining a U-shaped camming section, an adjusting member mounted on the adaptor to be movable in the first direction and having a plurality of camming tabs corresponding to and received within the flutes to have a wedging end formed on the camming tab in camming engagement with the camming section of the respect strip-like member in such a manner that the axial movement of the adjusting member drives the camming engagement between the wedging ends of the adjusting member and the camming sections of the strip-like members to elastically expand the strip-like members outward to establish a secure contact engagement with the inner side surface of the bore of the cigarette lighter holder.