# US 12,000,425 B2 · Locking threaded fastener assembly > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 12,000,425 B2 - Document ID: US12000425B2 - Status: Granted - Kind: B2 - Application number: 16/823,091 - Filed: 2020-03-18 - Published: 2021-09-23 - Granted: 2024-06-04 - Earliest claimed: 2020-03-18 - Assignees: Raytheon Company - Applicants: Raytheon Company - Inventors: Richard J. Adams - Web page: https://patentgrep.com/patent/US12000425B2 ## CPC - F16B 39/108: {with a locking washer under the nut or bolt head having at least one tongue or lug folded against the nut or bolt head, or against the object itself (F16B39/103 takes precedence)} - F16B 39/24: by means of washers, spring washers, or resilient plates that lock against the object (locking to the screw-thread F16B39/14 {, F16B39/34}, F16B39/36) - 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 locking fastener assembly comprising a fastener having a threaded portion, and a head having a first end and a second end axially spaced from the first end, the second end comprising a fastening surface and a locking washer recess. The locking fastener assembly further comprises a locking washer disposed at least partially within the locking washer recess, the locking washer comprising a locking tab extending in a first direction and a stop biased in a second direction opposing the first direction, wherein the locking tab is operable to lock rotation of the locking washer relative to an item being secured upon a torqueing rotation and a loosening rotation of the fastener. A locking member is supported by the fastener, and operable to interface with the stop of the locking washer upon the loosening rotation of the fastener to lock the fastener relative to the item being secured. ## Claims ### Claim 1 A locking fastener assembly comprising: a fastener comprising a threaded portion and a head having a first end and second end axially spaced from the first end, the second end comprising a fastening surface and a locking washer recess; a locking washer disposed at least partially within the locking washer recess, the locking washer comprising a locking tab extending in a first direction away from the head of the fastener and a stop biased to move in a second direction away from the locking tab and opposing the first direction, wherein the locking tab is operable to lock rotation of the locking washer relative to an item being secured upon a torqueing rotation and a loosening rotation of the fastener, and wherein the locking washer comprises a planar upper surface adjacent the stop; and a locking member supported by the fastener, and operable to interface with the stop of the locking washer upon the loosening rotation of the fastener to lock the fastener relative to the item being secured. ### Claim 2 (depends on 1) The locking fastener assembly of claim 1, wherein the fastener comprises a bolt, and wherein the threaded portion comprises an externally threaded shaft of the bolt. ### Claim 3 (depends on 1) The locking fastener assembly of claim 1, wherein the fastener comprises a nut, and wherein the threaded portion comprises an internally threaded bore of the nut. ### Claim 4 (depends on 1) The locking fastener assembly of claim 1, wherein the second end comprises an aperture in the locking washer recess and the locking member comprises a pin secured in the aperture and extending away from the first end. ### Claim 5 (depends on 1) The locking fastener assembly of claim 1, wherein the locking member comprises a protrusion formed in the locking washer recess, the protrusion extending away from the first end. ### Claim 6 (depends on 1) The locking fastener assembly of claim 1, wherein the locking washer comprises a split spring washer and the stop comprises a first end of the split spring washer and the locking tab comprises a second end of the split spring washer. ### Claim 7 (depends on 1) The locking fastener assembly of claim 1, wherein the locking washer comprises a plurality of support members defining a plurality of stops. ### Claim 8 (depends on 1) The locking fastener assembly of claim 1, wherein the fastening surface is located radially inward of the locking washer recess and the locking washer extends radially outward from the locking washer recess. ### Claim 9 (depends on 1) The locking fastener assembly of claim 1, wherein the fastening surface is located radially outward of the locking washer recess, wherein the fastener further comprises at least one access hole extending from the first end to the second end of the head, the access hole being in communication with the locking washer recess. ### Claim 10 A locking system, comprising: a base having a threaded interface operable to receive a locking fastener; an item for securement to the base, the item for securement to the base comprising a locking washer stop; and a locking fastener assembly comprising: a fastener comprising a threaded portion interfacing with the threaded interface of the base, and a head having a first end and second end axially spaced from the first end, the second end comprising a fastening surface and a locking washer recess; a locking washer disposed at least partially within the locking washer recess, the locking washer comprising a locking tab extending in a first direction away from the head of the fastener and into the locking washer stop and a stop biased to move in a second direction away from the locking tab and opposing the first direction, wherein the locking tab is operable to lock rotation of the locking washer relative to the item being secured upon a torqueing rotation and a loosening rotation of the fastener, and wherein the locking washer comprises a planar upper surface adjacent the stop; and a locking member supported by the fastener, and operable to travel along the planar surface and interface with the stop of the locking washer upon the loosening rotation of the fastener to lock the fastener relative to the item being secured. ### Claim 11 (depends on 10) The locking system of claim 10, wherein the locking washer stop comprises an aperture in the item for securement. ### Claim 12 (depends on 10) The locking system of claim 10, wherein the fastener comprises at least one of a bolt or a nut. ### Claim 13 (depends on 10) The locking system of claim 10, wherein the locking washer comprises a split spring washer, the stop comprises a first end of the split spring washer, and the locking tab comprises a second end of the split spring washer. ### Claim 14 (depends on 10) The locking system of claim 10, wherein the locking washer comprises a plurality of support members defining a plurality of stops. ### Claim 15 (depends on 10) The locking system of claim 10, wherein the fastening surface is located radially inward of the locking washer recess and the locking washer extends radially outward from the locking washer recess. ### Claim 16 (depends on 10) The locking system of claim 10, wherein the fastening surface is located radially outward of the locking washer recess, wherein the fastener further comprises at least one access hole extending from the first end to the second end of the head, the access hole being in communication with the locking washer recess. ### Claim 17 A method for configuring a locking fastener assembly, comprising: configuring a fastener to have a threaded portion and a head having a first end and second end axially spaced from the first end, the second end comprising a fastening surface and a locking washer recess; configuring a locking washer to be disposed at least partially within the locking washer recess and to have a locking tab extending in a first direction away from the head of the fastener and a stop biased to move in a second direction away from the locking tab and opposing the first direction, wherein the locking tab is operable to lock rotation of the locking washer relative to an item being secured upon a torqueing rotation and a loosening rotation of the fastener, and wherein the locking washer comprises a planar upper surface adjacent the stop; and configuring a locking member to be supported by the fastener and operable to interface with the stop of the locking washer upon the loosening rotation of the fastener to lock the fastener relative to the item being secured. ### Claim 18 (depends on 17) The method of claim 17, further comprising: configuring an item to be fastened to have a locking washer stop operable to receive the locking tab. ### Claim 19 (depends on 17) The method of claim 17, wherein the fastener comprises a bolt and the threaded portion comprises a threaded shaft of the bolt, the method further comprising, forming a threaded aperture in the base to receive the bolt. ### Claim 20 (depends on 17) The method of claim 17 wherein the locking member comprises a pin, the method further comprising forming a hole in the locking washer recess sized and shaped to receive the pin and securing the pin in the hole.