# US 11,029,131 B2 · Rail interface system > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 11,029,131 B2 - Document ID: US11029131B2 - Status: Granted - Kind: B2 - Application number: 16/730,683 - Filed: 2019-12-30 - Published: 2020-07-02 - Granted: 2021-06-08 - Earliest claimed: 2018-01-19 - Assignees: TangoDown, Inc. - Applicants: TangoDown, Inc. - Inventors: Jeffrey Matthew Cahill - Web page: https://patentgrep.com/patent/US11029131B2 ## CPC - F41G 11/001: {Means for mounting sighting or aiming devices on firearms} - F41G 11/003: {Mountings with a dove tail element, e.g. "Picatinny rail systems"} - F41C 27/00: Accessories; Details or attachments not otherwise provided for - F41G 11/007: {the device being tilted in a vertical plane} - F41G: WEAPON SIGHTS; AIMING (optical aspects thereof G02B) - F41C: SMALLARMS, e.g. PISTOLS, RIFLES (functional features or details common to both smallarms and ordnance, mountings therefor F41A; projecting missiles without use of explosive or combustible propellant charge F41B); ACCESSORIES THEREFOR ## Abstract The improved rail interface system uses a spring tensioned “locking” shoe that extends from the accessory body into the rail opening to restrictively engage the edges of the rail openings and hold the weapon accessory against the weapon or weapon component. The locking shoe mechanisms is incorporated into a weapon light mount but may be adapted for use with M-Lok® style rail openings without the use of specialized nuts and fasteners. ## Claims ### Claim 1 A rail interface system for connecting an accessory component to a weapon component, the interface system comprising: the weapon component having a first rail surface, a second rail surface, and at least one through rail opening extending between the first surface and the second surface, the rail opening defined by a peripheral edge formed between the first surface and the second surface, the peripheral edge having opposed end edges; and the accessory component including an interface body, and a first shoe element and a second shoe element extending from the interface body, the first shoe element and the second shoe element operatively engaged against one another for sliding movement relative to each other and the interface body between a locked position and an unlocked position to secure the accessory component to the weapon component, wherein each of the first shoe element and second shoe element extend into the rail opening and restrictively engage the opposed end edges of the rail opening when the shoe is in the unlocked position. ### Claim 2 (depends on 1) The interface system of claim 1 wherein each of the first shoe element and the second shoe element have a first end and a second end thereof, the second end of each of the first shoe element and the second shoe element restrictively engaging one of the opposed end edges and the second rail surface when the first shoe element and the second shoe element are in the locked position and disengaged from the one of the opposed end edges and the second rail surface when in the unlocked position. ### Claim 3 (depends on 1) The rail interface system of claim 1 wherein the second end of each of the first shoe element and the second shoe element has a foot part adapted to restrictively engage the opposed end edges of the rail opening when the shoe is in the unlocked position. ### Claim 4 (depends on 3) The rail interface system of claim 3 wherein the accessory component also includes a spring disposed between the first end of each of the first shoe element and the second shoe element to urge the first shoe element and the second shoe element longitudinally apart to the locked position. ### Claim 5 (depends on 1) The rail interface system of claim 1 wherein the interface body having a contact surface adapted to abut against the first rail surface when the accessory component is affixed to the weapon component, the first shoe element and the second shoe element extending from the contact surface. ### Claim 6 (depends on 1) The interface system of claim 1 wherein the interface body has a bore defined therein, the first shoe element has a longitudinal slot defined therein, the second shoe element has a threaded bore defined therein, the accessory component includes a fastener part extending through the interface body bore and the first shoe element slot and turns into the second element threaded bore to secure the first shoe element and the second shoe element in either of the locked position and the unlocked position. ### Claim 7 A rail interface system for connecting an accessory component to a weapon component, where the weapon component having a first rail surface, a second rail surface, and at least one through rail opening extending between the first surface and the second surface, the rail opening defined by a peripheral edge formed between the first surface and the second surface, the peripheral edge having opposed end edges, the interface system comprising: the accessory component including an interface body, and a first shoe element and a second shoe element extending from the interface body, the first shoe element and the second shoe element operatively engaged against each other for sliding movement relative to each other and the interface body between a locked position and an unlocked position to secure the accessory component to the weapon component, wherein each of the first shoe element and second shoe element extend into the rail opening and restrictively engage the opposed end edges of the rail opening when the shoe is in the unlocked position. ### Claim 8 (depends on 7) The interface system of claim 7 wherein each of the first shoe element and the second shoe element have a first end and a second end thereof, the second end of each of the first shoe element and the second shoe element restrictively engaging one of the opposed end edges and the second rail surface when the first shoe element and the second shoe element are in the locked position and disengaged from the one of the opposed end edges and the second rail surface when in the unlocked position. ### Claim 9 (depends on 7) The rail interface system of claim 7 wherein the second end of each of the first shoe element and the second shoe element has a foot part adapted to restrictively engage the opposed end edges of the rail opening when the shoe is in the unlocked position. ### Claim 10 (depends on 9) The rail interface system of claim 9 wherein the accessory component also includes a spring disposed between the first end of each of the first shoe element and the second shoe element to urge the first shoe element and the second shoe element longitudinally apart to the locked position. ### Claim 11 (depends on 7) The rail interface system of claim 7 wherein the interface body having a contact surface adapted to abut against the first rail surface when the accessory component is affixed to the weapon component, the first shoe element and the second shoe element extending from the contact surface. ### Claim 12 (depends on 7) The interface system of claim 7 wherein the interface body has a bore defined therein, the first shoe element has a longitudinal slot defined therein, the second shoe element has a threaded bore defined therein, the accessory component includes a fastener part extending through the interface body bore and the first shoe element slot and turns into the second element threaded bore to secure the first shoe element and the second shoe element in either of the locked position and the unlocked position.