Patent ID: 6908273
Filing Date: 2005-06-21
Classification: B25B,F16B,Y10S

Abstract:
1. A releasable security fixing system comprising: (a) a bolt having a head and a shank with a threaded portion and a non-threaded reduced diameter portion; (b) a security nut which is engagable threadingly with the threaded portion of the shank of the bolt such that, in use, the non-threaded reduced diameter portion of the shank of the bolt projects beyond the security nut in its installed position, the security nut having circular periphery and provided with a plurality of grooves cut into one end of the nut and extending away from the one end; (c) a cupped collar having a hole in a cupped end to fit over the shank of the bolt and having a length greater than a projecting end of the shank of the bolt when installed, and an open end defining a bore to receive the security nut such that the circular periphery of the security nut extends into close conformity with the bore of the collar, (d) a sleeve fitted about a periphery of the collar; and (e) complimentary key for fitting and releasing the nut, the key having an aperture to receive the projecting end of the bolt shank.