# US 10,480,878 B2 · Detachable box magazine with follower retraction member > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 10,480,878 B2 - Document ID: US10480878B2 - Status: Granted - Kind: B2 - Application number: 16/251,541 - Filed: 2019-01-18 - Published: 2019-05-23 - Granted: 2019-11-19 - Earliest claimed: 2017-04-14 - Applicants: Kent J Myers; Kent J Myers, II - Inventors: Kent J Myers; Kent J Myers, II - Web page: https://patentgrep.com/patent/US10480878B2 ## CPC - F41A 9/67: having means for depressing the cartridge follower, or for locking it in a depressed position - F41A 9/70: Arrangements thereon for discharging, e.g. cartridge followers or discharge throats - F41A: FUNCTIONAL FEATURES OR DETAILS COMMON TO BOTH SMALLARMS AND ORDNANCE, e.g. CANNONS; MOUNTINGS FOR SMALLARMS OR ORDNANCE ## Abstract A detachable box magazine includes a housing having a base; a follower; a biasing element biasing said follower away from said base; a spool member; a retraction member operatively connected to said follower and to said spool member; and a winding member having a spool-engaged position wherein the winding member is engaged with the spool member and rotation of the winding member causes the retraction member to wind on the spool member, the spool-engaged position being achieved upon sufficient rotation of the winding member in a winding direction, and the winding member having a release position wherein the winding member is disengaged from the spool member, the winding member being moved from the spool-engaged position to the release position upon sufficient rotation of the winding member in an unwinding direction opposite the winding direction. ## Claims ### Claim 1 A detachable box magazine comprising: a housing having a base; a follower; a biasing element biasing said follower away from said base; a spool member; a retraction member operatively connected to said follower and to said spool member; a winding member having a spool-engaged position wherein said winding member is operatively engaged with said spool member and rotation of said winding member causes said retraction member to wind on said spool member and pull said follower toward said base, said spool-engaged position being achieved upon sufficient rotation of said winding member in a winding direction, and said winding member having a release position wherein said winding member is disengaged from said spool member, said winding member being moved from said spool-engaged position to said release position upon sufficient rotation of said winding member in an unwinding direction opposite said winding direction. ### Claim 2 (depends on 1) The detachable box magazine of claim 1, wherein said winding member is a hand-driven winding member. ### Claim 3 (depends on 1) The detachable box magazine as in claim 1, wherein, when said winding member is in said spool-engaged position, said spool member is prevented from rotating in said unwinding direction thus preventing said retraction member from unwinding from said spool member under the bias of said biasing element. ### Claim 4 (depends on 3) The detachable box magazine as in claim 3, wherein, when said winding member is in said release position, said spool member is permitted to rotate in said unwinding direction under the bias of said biasing element to permit said retraction member to unwind from said spool member. ### Claim 5 (depends on 4) The detachable box magazine as in claim 4, further comprising a locking member preventing rotation of said spool member in said unwinding direction when said winding member is engaged with said spool member. ### Claim 6 (depends on 5) The detachable box magazine of claim 5, further comprising a drive nut interacting with said locking member to allow rotation of said drive nut in said winding direction and prevent rotation of said drive nut in said unwinding direction, said locking member permitting axial movement of said drive nut toward and away from said spool member. ### Claim 7 (depends on 6) The detachable box magazine of claim 6, wherein said drive nut includes a drive shaft extending through said spool member and engaging said winding member. ### Claim 8 (depends on 7) The detachable box magazine of claim 7, wherein a portion of said drive shaft includes threads that interact with threads of a threaded bore associated with said winding member. ### Claim 9 (depends on 8) The detachable box magazine of claim 8, wherein the interaction of the threads of said drive shaft and the threads of said threaded bore cause said drive shaft to be moved to achieve said spool-engaged position from said release position upon rotation of said winding member in said winding direction, and cause said drive shaft to be moved to achieve said release position from said spool-engaged position upon rotation of said winding member in said unwinding direction. ### Claim 10 (depends on 9) The detachable box magazine of claim 9, wherein surfaces of any one of said spool member, said winding member, and said drive nut are cut or shaped so as to facilitate the engagement in the spool-engaged position. ### Claim 11 (depends on 9) The detachable box magazine of claim 9, wherein said winding member and drive nut and spool member achieve said spool engaged position upon the establishing of sufficient friction between flat surfaces of said drive nut, said spool member, and said winding member. ### Claim 12 (depends on 9) The detachable box magazine of claim 9, wherein said threaded bore is provided by an threaded insert having a knurled portion molded into said winding member. ### Claim 13 (depends on 12) The detachable box magazine of claim 12, wherein said threaded insert includes an end plate, said drive nut driving said spool member against said end plate in said spool-engaged position. ### Claim 14 (depends on 6) The detachable box magazine of claim 6, wherein said locking member is a one-way bearing, and said drive nut includes an axle extending into said one-way bearing. ### Claim 15 (depends on 6) The detachable box magazine of claim 6, wherein said locking member is a pawl, and said drive nut includes a gear interacting with said pawl to form a ratchet mechanism. ### Claim 16 (depends on 15) The detachable box magazine of claim 15, further comprising a lock-biasing element forcing said locking member toward said drive nut. ### Claim 17 (depends on 16) The detachable box magazine of claim 16, wherein said locking member is positioned in said base such that it cannot rotate. ### Claim 18 (depends on 17) The detachable box magazine of claim 17, wherein said locking member is positioned in said base such that it can move toward and away from said drive nut.