# US 10,866,042 B1 · Takedown pin for a firearm > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 10,866,042 B1 - Document ID: US10866042B1 - Status: Granted - Kind: B1 - Application number: 16/160,973 - Filed: 2018-10-15 - Granted: 2020-12-15 - Earliest claimed: 2016-11-30 - Assignees: Battlearms IP, LLC - Applicants: BattleArms IP, LLC - Inventors: George Huang; Eli S. Brandt - Web page: https://patentgrep.com/patent/US10866042B1 ## CPC - F41A 3/66: Breech housings or frames; Receivers - F16B 21/165: {with balls or rollers (for connections of rods or tubes engaged telescopically F16B7/1409)} - F41A 11/00: Assembly or disassembly features; Modular concepts; Articulated or collapsible guns (F41A3/64, F41A19/10 - F41A19/15, F41A21/48, F41A25/26 take precedence) - F41A: FUNCTIONAL FEATURES OR DETAILS COMMON TO BOTH SMALLARMS AND ORDNANCE, e.g. CANNONS; MOUNTINGS FOR SMALLARMS OR ORDNANCE - 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 takedown pin for a firearm, having at least some of a head; a shank, wherein the shank extends from the head to a terminal surface; a projection extending from at least a portion of the terminal surface; a first groove or slot formed in at least a portion of the shank; a second groove or slot formed in at least a portion of the shank, wherein the first end of the first groove or slot is positioned at a spaced apart location from the first end of the second groove or slot; and a connecting groove or slot formed between the first end of the first groove or slot and the first end of the second groove or slot. ## Claims ### Claim 1 A takedown pin, comprising: a head; a shank, wherein said shank extends, along a longitudinal axis, from said head to a terminal surface; a projection extending from at least a portion of said terminal surface; a first groove or slot formed in at least a portion of said shank, wherein a first detent recess is formed proximate a first end of said first groove or slot, and wherein a second detent recess is formed proximate a second end of said first groove or slot; a second groove or slot formed in at least a portion of said shank, wherein a first detent recess is formed proximate a first end of said second groove or slot, wherein a second detent recess is formed proximate a second end of said second groove or slot, wherein said second end of said second groove or slot extends to an open or at least partially open end that extends through said terminal surface of said shank and through at least a portion of said projection, and wherein said first end of said first groove or slot is positioned at a spaced apart location from said first end of said second groove or slot; and a connecting groove or slot formed between said first end of said first groove or slot and said first end of said second groove or slot. ### Claim 2 (depends on 1) The takedown pin of claim 1, wherein said first groove or slot defines an elongate, substantially linear first groove or slot that extends along said longitudinal axis. ### Claim 3 (depends on 1) The takedown pin of claim 1, wherein said first groove or slot limits rotational movement and longitudinal movement of said takedown pin, relative to a lower receiver. ### Claim 4 (depends on 1) The takedown pin of claim 1, wherein if said takedown pin is appropriately positioned within a lower receiver of a firearm, a detent pin positioned at least partially within said first groove or slot interacts with said first groove or slot so that said takedown pin can be repeatedly urged between an engaged or locked position, wherein said firearm is operable, and a partially engaged or inoperably locked position, wherein said firearm is inoperable. ### Claim 5 (depends on 1) The takedown pin of claim 1, wherein said first detent recess of said first groove or slot is associated with an engaged or locked position and said second detent recess of said first groove or slot is associated with a partially engaged or inoperably locked position. ### Claim 6 (depends on 1) The takedown pin of claim 1, wherein said second groove or slot defines an elongate, substantially linear first groove or slot. ### Claim 7 (depends on 1) The takedown pin of claim 1, wherein said second groove or slot defines a substantially arcuate, second groove or slot. ### Claim 8 (depends on 1) The takedown pin of claim 1, wherein said second groove or slot limits said rotational movement of said takedown pin to 90°, on said longitudinal axis of said shank. ### Claim 9 (depends on 1) The takedown pin of claim 1, wherein if said takedown pin is appropriately positioned within a lower receiver of a firearm, a detent pin positioned at least partially within said second groove or slot interacts with said second groove or slot so that said takedown pin can be repeatedly urged between an engaged or locked position, wherein said firearm is operable, and a disengaged or unlocked position, wherein said firearm is inoperable. ### Claim 10 (depends on 1) The takedown pin of claim 1, wherein said first end of said first groove or slot is positioned approximately 180° around said shank from said first end of said second groove or slot. ### Claim 11 (depends on 1) The takedown pin of claim 1, wherein said first end of said first groove or slot is positioned approximately 90° around said shank from said first end of said second groove or slot. ### Claim 12 (depends on 1) The takedown pin of claim 1, wherein said connecting groove or slot is formed so that said takedown pin can be rotated such that a detent pin can engage at least a portion of said connecting groove or slot to transition between said first groove or slot and said second groove or slot. ### Claim 13 (depends on 1) The takedown pin of claim 1, wherein said projection includes an arcuate or semicircular surface portion. ### Claim 14 (depends on 1) The takedown pin of claim 1, wherein said projection comprises a pin that extends from said terminal surface of said shank. ### Claim 15 A takedown pin, comprising: a head; a shank, wherein said shank extends from said head to a terminal surface; a first groove or slot formed in at least a portion of said shank, wherein a first detent recess is formed proximate a first end of said first groove or slot, and wherein a second detent recess is formed proximate a second end of said first groove or slot; a second groove or slot formed in at least a portion of said shank, wherein a first detent recess is formed proximate a first end of said second groove or slot, wherein said second end of said second groove or slot extends to an open or at least partially open end that extends through said terminal surface of said shank, and wherein said first end of said first groove or slot is positioned at a spaced apart location from said first end of said second groove or slot; and a connecting groove or slot formed between said first end of said first groove or slot and said first end of said second groove or slot. ### Claim 16 (depends on 15) The takedown pin of claim 15, further comprising a projection extending from at least a portion of said terminal surface. ### Claim 17 A takedown pin for a firearm, comprising: a head; a shank, wherein said shank extends from said head to a terminal surface; a projection extending from at least a portion of said terminal surface; a first groove or slot formed in at least a portion of said shank, wherein a first detent recess is formed proximate a first end of said first groove or slot, and wherein a second detent recess is formed proximate a second end of said first groove or slot; a second groove or slot formed in at least a portion of said shank, wherein said first end of said first groove or slot is positioned at a spaced apart location from a first end of said second groove or slot; and a connecting groove or slot formed between said first groove or slot and said second groove or slot. ### Claim 18 (depends on 17) The takedown pin of claim 17, wherein a detent recess is formed proximate said first end of said second groove or slot, and wherein a detent recess is formed proximate a second end of said second groove or slot. ### Claim 19 (depends on 17) The takedown pin of claim 17, wherein said second end of said first groove or slot extends to an open or at least partially open end that extends through said terminal surface of said shank. ### Claim 20 (depends on 17) The takedown pin of claim 17, wherein a second end of said second groove or slot extends to an open or at least partially open end that extends through said terminal surface of said shank and through at least a portion of said projection.