IPC분류정보
국가/구분 |
United States(US) Patent
등록
|
국제특허분류(IPC7판) |
|
출원번호 |
US-0755714
(2013-01-31)
|
등록번호 |
US-8863426
(2014-10-21)
|
발명자
/ 주소 |
|
출원인 / 주소 |
|
대리인 / 주소 |
|
인용정보 |
피인용 횟수 :
32 인용 특허 :
11 |
초록
▼
A quick-detach, free floating, two-piece forward hand guard assembly for a rifle, which includes an inner barrel nut adapted for connection to the rifle's receiver and an outer barrel nut telescopically received over the inner barrel nut and secured thereto to prevent rotation therebetween. The hand
A quick-detach, free floating, two-piece forward hand guard assembly for a rifle, which includes an inner barrel nut adapted for connection to the rifle's receiver and an outer barrel nut telescopically received over the inner barrel nut and secured thereto to prevent rotation therebetween. The hand guard assembly also includes a top hand guard element engaged with and extending forwardly from the outer barrel nut in a laterally-stable cantilevered orientation above the rifle's barrel. A bottom hand guard element is matingly engaged with the top hand guard element for surrounding the bottom portion of the rifle's barrel and free-floats from the top hand guard element. A spring-loaded detent screw attaches the top and bottom hand guard elements together and also engages the inner barrel nut. For quick-detach barrel removal, the outer barrel nut may be hinged for clamshell action, with the inner barrel nut having a separable two-piece extension.
대표청구항
▼
1. A quick-detach and free-floating forward hand guard assembly for a rifle having a receiver and a barrel supported by the receiver, said hand guard assembly comprising: a generally tubular inner barrel nut having an outer surface, a rearward end, and a forward end;an outer barrel nut received over
1. A quick-detach and free-floating forward hand guard assembly for a rifle having a receiver and a barrel supported by the receiver, said hand guard assembly comprising: a generally tubular inner barrel nut having an outer surface, a rearward end, and a forward end;an outer barrel nut received over said inner barrel nut and secured thereto for non-rotation of said outer barrel nut with respect to said inner barrel nut, said outer barrel nut having a receiver end, spaced-apart tabs on said receiver end, and an opposed barrel end, said receiver end of said outer barrel nut surrounding said rearward end of said inner barrel nut and said opposed barrel end of said outer barrel nut surrounding said forward end of said inner barrel nut, said outer barrel nut further comprising a top stabilizing member, a bottom stabilizing member, two laterally-extending side lugs in opposed positioning from one another, and opposed holes through said receiver end of said outer barrel nut in positions placing one of said holes adjacent to a different one of said laterally-extending side lugs;a top hand guard element having a receiver end engaged with said receiver end of said outer barrel nut and a barrel end extending forwardly beyond said barrel end of said outer barrel nut, said top hand guard element also having opposed upper recesses that receive said laterally-extending side lugs of said outer barrel nut after said top hand guard element is pushed downwardly toward said top stabilizing member and is caused to slide around said side lugs, said top hand guard element also having two laterally-opposed downward lugs on said barrel end, said top hand guard element further having top interior receiving structure in receipt of said top stabilizing member of said outer barrel nut, said top interior receiving structure closely aligned with said top stabilizing member of said outer barrel nut and reducing movement of said top hand guard element relative to said outer barrel nut, said top hand guard element further comprising at least one internally-threaded sling swivel recess;a bottom hand guard element having a receiver end engaged associated with said receiver end of said upper hand guard element and a barrel end associated with said barrel end of said top hand guard element, said bottom hand guard element matingly engaged with said top hand guard element and having two elongated side channels each laterally-opposed from one another, said side channels each receiving a different one of said laterally-opposed downward lugs on said top hand guard element, each said side channel also having a barrel end and a receiver end, said bottom hand guard element further comprising opposed lateral recesses each positioned above said barrel end of a different one of said side channels allowing said top and bottom hand guard elements to become locked together with said receiver ends respectively thereof becoming positioned around said outer barrel nut as said bottom hand guard element is pushed upward toward said top hand guard element and slides in a rearward motion toward said outer barrel nut, said bottom hand guard element also having bottom interior receiving structure in receipt of said bottom stabilizing member of said outer barrel nut, said bottom interior receiving structure closely aligned with said bottom stabilizing member and reducing movement of said bottom hand guard element relative to said outer barrel nut when said top hand guard element and said bottom hand guard element are matingly engaged and said bottom hand guard element is free-floating from said top hand guard element, said bottom hand guard element further comprising a plurality of non-threaded sling swivel recesses; andat least one quick-detach spring-loaded screw inserted through one of said non-threaded sling swivel recesses on said receiver end of said bottom hand guard element and tightened within one of said threaded sling swivel recesses on said receiver end of said top hand guard element until said screw also becomes inserted through one of said holes in said outer barrel nut and applies pressure against said outer surface of said inner barrel nut, wherein when said rearward end of said inner barrel nut is connected to a front portion of the rifle receiver and said tabs on said receiver end of said outer barrel nut independently engage the front portion of the rifle receiver, said forward end of said inner barrel nut becomes positioned over and around the rifle barrel without contacting the barrel, said top hand guard element as it engages said outer barrel nut becomes cantilevered over and free-floating above the rifle barrel, and said bottom hand guard element when connected to said top hand guard element becomes positioned under the rifle barrel with said spring-loaded screw inserted through one of said holes on said receiver end of said outer barrel nut and aligned ones of said sling swivel recesses on said receiver ends of said top and bottom hand guard elements, whereafter tightening said screw to apply pressure against said outer surface of said inner barrel nut allows said top and bottom hand guard elements joined around the rifle barrel to have laterally-stable positioning around the barrel without up-and-down or side-to-side movement relative to the barrel, no contact with the barrel, quick-detachment to expose the barrel, and no interference with rifle operation and accuracy. 2. The hand guard assembly according to claim 1 wherein said rearward end of said inner barrel nut comprises female threads providing a secure connection between said inner barrel nut and the rifle receiver. 3. The hand guard assembly according to claim 1 wherein said inner barrel nut further comprises at least one opening therethrough allowing tool-assisted tightening of said inner barrel nut to the rifle receiver. 4. The hand guard assembly according to claim 1 wherein said inner barrel nut further comprises a two-piece separable extension. 5. The hand guard assembly according to claim 4 wherein said bottom stabilizing member of said outer barrel nut further comprises a bottom hinge and said top stabilizing member further comprises a split, said hinge and said split together allowing said outer barrel nut to achieve clamshell closing action around said inner barrel nut, said two-piece separable extension and said clamshell closing action facilitating rapid barrel access and detachment. 6. The hand guard assembly according to claim 5 wherein said top hand guard element further has a tool access opening therethrough and said outer barrel nut has a threaded receiving hole for a fastener, said tool access opening and said threaded receiving hole aligned with one another so as to allow insertion of a tool through said access opening and engagement of the tool with a fastener tightened in said threaded receiving hole for adjustment of said clamshell closing action for secure engagement of said outer barrel nut around said inner barrel nut. 7. The hand guard assembly according to claim 1 wherein said inner barrel nut further comprises an outer surface and at least one circumferential recess in said outer surface, and engagement of said quick-detach spring-loaded screw with inner barrel nut occurring within said at least one circumferential recess to provide fixed positioning of said outer barrel nut against said inner barrel nut. 8. The hand guard assembly according to claim 4 wherein said two-piece separable extension has a barrel end and connection-assisting structure allowing insertion of a tool that is selected from a group consisting of holes through said two-piece separable extension and notches in said barrel end of said two-piece separable extension. 9. The hand guard assembly according to claim 4 wherein said rearward end of said inner barrel nut further comprises a ring-shaped receiver portion, and said two-piece separable extension has a threaded connection with said ring-shaped receiver portion. 10. The hand guard assembly according to claim 4 wherein said at least one quick-detach spring-loaded screw is a detent screw with an easily hand-manipulated handle portion. 11. The hand guard assembly according to claim 1 wherein said outer barrel nut further comprises at least one heat-dissipating baffle. 12. The hand guard assembly according to claim 11 wherein said at least one heat-dissipating baffle has a radially-extending configuration. 13. The hand guard assembly according to claim 1 further comprising at least one heat venting hole selected from a group consisting of heat venting holes through said top hand guard element and heat venting holes through said bottom hand guard element. 14. The hand guard assembly according to claim 1 further comprising at least one accessory mounting rail axially aligned with said top and bottom hand guard elements. 15. The hand guard assembly according to claim 14 having four said accessory mounting rails defining a quad rail construction, and wherein one said accessory mounting rail is associated with said top hand guard element and wherein three of said accessory mounting rails are associated with said bottom hand guard element. 16. The hand guard assembly according to claim 15 wherein said quad rail construction comprises four accessory mounting rails substantially equally spaced about a perimeter of said combined top and bottom hand guard elements, each conforming to MIL-STD-1913. 17. The hand guard assembly according to claim 1 further comprising: said rearward end of said inner barrel nut having female threads providing a secure connection between said inner barrel nut and the rifle receiver;said inner barrel nut further having at least one opening therethrough allowing tool-assisted tightening of said inner barrel nut to the rifle receiver, and also having at least one circumferential recess in said outer surface providing engagement of said quick-detach spring-loaded screw with inner barrel nut and further providing fixed positioning of said outer barrel nut against said inner barrel nut;said at least one quick-detach spring-loaded screw is configured as a detent screw with an easily hand-manipulated handle;said outer barrel nut further having at least one heat-dissipating baffle with a radially-extending configuration;a plurality of heat venting holes through said top hand guard element and through said bottom hand guard element; andfour accessory mounting rails axially aligned with said top and bottom hand guard elements and defining a quad rail construction, with one of said accessory mounting rails associated with said top hand guard element and three of said accessory mounting rails associated with said bottom hand guard element, said four accessory mounting rails substantially equally spaced apart from one another. 18. The hand guard assembly according to claim 17 wherein said bottom stabilizing member of said outer barrel nut further comprises at least one fastener hole therethrough in communication with said inner barrel nut, wherein a fastener tightened in each said at least one fastener hole provides fixed positioning of said outer barrel nut to said inner barrel nut. 19. The hand guard assembly according to claim 1 further comprising: said rearward end of said inner barrel nut having female threads providing a secure connection between said inner barrel nut and the rifle receiver;said inner barrel nut further having at least one opening therethrough allowing tool-assisted tightening of said inner barrel nut to the rifle receiver, and also having at least one circumferential recess in said outer surface providing engagement of said quick-detach spring-loaded screw with inner barrel nut and further providing fixed positioning of said outer barrel nut against said inner barrel nut;said inner barrel nut further having a two-piece separable extension and a ring-shaped receiver portion with a threaded connection therebetween,said bottom stabilizing member of said outer barrel nut further comprises a bottom hinge and said top stabilizing member further comprises a split, said hinge and said split together allowing said outer barrel nut to achieve clamshell closing action around said inner barrel nut, said two-piece separable extension and said clamshell closing action facilitating rapid barrel access and detachment;said at least one quick-detach spring-loaded screw configured as a detent screw with an easily hand-manipulated handle;said outer barrel nut further having at least one heat-dissipating baffle with a radially-extending configuration;a plurality of heat venting holes through said top hand guard element and through said bottom hand guard element; andfour accessory mounting rails axially aligned with said top and bottom hand guard elements and defining a quad rail construction, with one of said accessory mounting rails associated with said top hand guard element and three of said accessory mounting rails associated with said bottom hand guard element, said four accessory mounting rails substantially equally spaced apart from one another. 20. The hand guard assembly according to claim 19 wherein said top hand guard element further has a tool access opening therethrough and said outer barrel nut has a threaded receiving hole for a fastener, said tool access opening and said threaded receiving hole aligned with one another so as to allow insertion of a tool through said access opening and engagement of the tool with a fastener tightened in said threaded receiving hole for adjustment of said clamshell closing action for secure engagement of said outer barrel nut around said inner barrel nut.
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