# US 2013/0156525 A1 · Blind fastener > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2013/0156525 A1 - Document ID: US20130156525A1 - Status: Published application - Kind: A1 - Application number: 13/328,738 - Filed: 2011-12-16 - Published: 2013-06-20 - Earliest claimed: 2011-12-16 - Assignees: Ev IP LP - Inventors: Neil Frank Gill; Mark Gaskell; Douglas Ramsey Norris; Terry Williams - Web page: https://patentgrep.com/patent/US20130156525A1 ## CPC - F16B 13/066: {fastened by extracting a separate expander-part, actuated by the screw, nail or the like} - F16B 13/0858: {with an expansible sleeve or dowel body driven against a tapered or spherical expander plug (F16B13/004 takes precedence)} - F16B 35/02: divided longitudinally - F16B 3/00: Key-type connections; Keys (F16B2/00 takes precedence; for rods or tubes mutually F16B7/00) - F16B 33/002: {Means for preventing rotation of screw-threaded elements (F16B39/00 takes precedence)} - F16B: DEVICES FOR FASTENING OR SECURING CONSTRUCTIONAL ELEMENTS OR MACHINE PARTS TOGETHER, e.g. NAILS, BOLTS, CIRCLIPS, CLAMPS, CLIPS OR WEDGES; JOINTS OR JOINTING (couplings for transmitting rotation F16D) ## Abstract A blind fastener adapter for a conventional screw-threaded nut and screw comprises a collar and a segmented ring over the collar, the ring and collar having a tapered interface wherein relative axial movement results in a change of diameter of the ring. The adapter further includes a spring adapted to bias the collar and ring into mutual engagement; the collar and ring include means to prevent substantial relative angular movement thereof. The collar is adapted for engagement by a blind side head of the screw in use, and the ring is adapted for blind side engagement of the perimeter of a hole. ## Claims ### Claim 1 A blind fastener adapter for a conventional screw-threaded nut and screw, the adapter comprising a collar and a segmented ring over the collar, the ring and collar having a tapered interface wherein relative axial movement results in a change of diameter of said ring, said adapter further including a spring adapted to bias said collar and ring into mutual engagement, said collar and ring including means to prevent substantial relative angular movement thereof, said collar being adapted for engagement by a blind side head of said screw in use, and said ring being adapted for blind side engagement of the perimeter of a hole. ### Claim 2 (depends on 1) A blind fastener adapter as claimed in claim 1 wherein the blind side head is a nut or the head of a male fastener, such as a machine screw or bolt. ### Claim 3 (depends on 1) A blind fastener adapter as claimed in claim 1 wherein the screw is a threaded stud, or the shank of a male fastener. ### Claim 4 (depends on 1) A blind fastener adapter as claimed in claim 1 wherein the ring and collar are fixed against relative rotation by dogs. ### Claim 5 (depends on 4) A blind fastener adapter as claimed in claim 4 wherein the dogs comprise protrusions of one of the ring and collar, and mating recesses of the other of ring and collar. ### Claim 6 (depends on 5) A blind fastener adapter as claimed in claim 5 wherein protruding rails of the collar extend in the direction of the axis of rotation thereof, and engage in close fitting grooves of the ring. ### Claim 7 (depends on 4) A blind fastener adapter as claimed in claim 4 wherein the ring has three segments, each segment being restrained by a suitable dog. ### Claim 8 (depends on 7) A blind fastener adapter as claimed in claim 7 wherein each segment is retained against radial separation by the collar. ### Claim 9 (depends on 8) A blind fastener adapter as claimed in claim 8 wherein each segment is retained against radial separation by an enlarged head of a rail engageable in an undercut groove. ### Claim 10 (depends on 1) A blind fastener adapter as claimed in claim 1 wherein the spring is a coil compression spring bearing directly on said ring in use, and sized to fit closely around said screw. ### Claim 11 (depends on 10) A blind fastener adapter as claimed in claim 10 wherein the fastener includes a further coil compression spring outboard the aforesaid coil compression spring and of a diameter insufficient to pass through a hole for which the fastener is intended. ### Claim 12 (depends on 1) A blind fastener adapter as claimed in claim 1 and further including a collared washer at the proximal side of said coil spring. ### Claim 13 (depends on 12) A blind fastener adapter as claimed in claim 12 wherein a reduced diameter of said washer is sized to engage closely within the hole for which the fastener is intended, and the washer has an internal recess of sufficient depth to accept said spring when compressed. ### Claim 14 (depends on 12) A blind fastener adapter as claimed in claim 12 and further including a tubular bush positioned between the collared washer and the proximal side of said coil spring. ### Claim 15 (depends on 1) A blind fastener adapter as claimed in claim 1 wherein the ring has a reduced diameter portion at the proximal side so as to present a shoulder, the reduced diameter portion also being sized for close fitting engagement in the hole for which the fastener is intended, and the shoulder bearing on the perimeter of the distal side of the hole in use. ### Claim 16 (depends on 1) A blind fastener adapter as claimed in claim 1 wherein a further washer is provided proximally of the segmented ring so as to distribute spring loads applied thereto. ### Claim 17 (depends on 16) A blind fastener adapter as claimed in claim 16 wherein the further washer is a close diameter fit in the hole for which the fastener is intended. ### Claim 18 (depends on 16) A blind fastener adapter as claimed in claim 16 wherein the further washer is of a thickness to substantially bridge the clearance between the segmented ring and collared washer in use.