FIREARM HAVING AN EXPULSION DEVICE

• US 20100000138A1
• Filed: 07/01/2009
• Published: 01/07/2010
• Est. Priority Date: 07/01/2008
• Status: Active Grant

• Current Assignee: Adcor Industries, Inc.
• Original Assignee: Adcor Industries, Inc.
• Inventors: Brown, Michael J.
• Granted Patent: US 8,210,090 B2
• Time in Patent Office: Days
• US Class Current: 42/90
• CPC Class Codes: F41A 29/00 Cleaning or lubricating arrangements injecting fluids into barrels or cartridge chambers F41A13/04 ; ammunition for cleaning purposes F42B5/24
• CPC Class Codes: F41A 35/00 Accessories or details not otherwise provided for
• CPC Class Codes: F41C 27/00 Accessories; Details or attachments not otherwise provided for

Abstract

The present invention provides for a firearm including a buttstock defining a first bore extending along a longitudinal axis and a receiver coupled to the buttstock. The receiver defines a second bore extending substantially parallel to the longitudinal axis and in fluid communication with the first bore. The receiver also defines an ejection port transverse to the longitudinal axis. The firearm further includes a bolt carrier disposed in the second bore and moveable relative to the receiver along the longitudinal axis between a firing position and a rearward position. The firearm also includes an expulsion device at least partially disposed in the buttstock for flowing air through the first and second bores and out the ejection port as the bolt carrier moves between the firing and rearward positions.

Claims

1. A firearm comprising:

a buttstock defining a first bore extending along a longitudinal axis;

a receiver coupled to said buttstock and defining a second bore extending substantially parallel to said longitudinal axis and in fluid communication with said first bore with said receiver defining an ejection port transverse to said longitudinal axis;

a bolt carrier disposed in said second bore and moveable relative to said receiver along said longitudinal axis between a firing position and a rearward position; and

an expulsion device at least partially disposed in said buttstock for flowing air through said first and second bores and out said ejection port as said bolt carrier moves between said firing and rearward positions.

2. A firearm as set forth in claim 1 wherein said expulsion device includes a piston disposed in one of said first and second bores and having a front end and a back end spaced from said front end along said longitudinal axis with said front end abutting said bolt carrier such that said piston is movable with said bolt carrier between said firing and rearward positions.

3. A firearm as set forth in claim 2 wherein said expulsion device includes a first valve coupled to one of said buttstock and said piston for selectively flowing air out of said ejection port.

4. A firearm as set forth in claim 3 wherein said expulsion device includes a second valve coupled to said buttstock for selectively flowing air into said first bore with said first valve coupled to said piston for selectively flowing air though said second bore and out said ejection port.

5. A firearm as set forth in claim 4 wherein said first valve is movable between a first position preventing air from flowing out said ejection port and a second position allowing air to flow out said ejection port and said second valve is movable between a third position preventing air from flowing into said first bore and a fourth position allowing air to flow into said first bore.

6. A firearm as set forth in claim 5 wherein said first valve is in said second position and said second valve is in said third position as said bolt carrier moves toward said rearward position.

7. A firearm as set forth in claim 5 wherein said first valve is in said first position and said second valve is in said fourth position as said bolt carrier moves toward said firing position.

8. A firearm as set forth in claim 3 wherein said piston is disposed in said first bore and defines a hole extending along said longitudinal axis between said front and back ends with said hole in fluid communication with said first and second bores for directing air out said ejection port.

9. A firearm as set forth in claim 8 wherein said first valve is coupled to said front end of said piston adjacent said hole and movable between a first position with said first valve disposed over said hole preventing air from flowing out said ejection port and a second position with said first valve spaced from said hole allowing air to flow out said ejection port.

10. A firearm as set forth in claim 8 wherein said expulsion device further including a weight movably disposed within said hole of said piston with said weight defining an orifice extending along said longitudinal axis and open to said hole for directing air therethrough.

11. A firearm as set forth in claim 4 wherein said buttstock includes a distal end spaced from said receiver along said longitudinal axis and defining an aperture open to said first bore with said second valve attached to said distal end adjacent said aperture within said first bore and movable between a third position with said second valve disposed over said aperture preventing air from flowing into said first bore and a fourth position with said second valve spaced from said aperture allowing air to flow into said first bore.

12. A firearm as set forth in claim 11 wherein said expulsion device includes a plug attached to said distal end within said aperture and a filter disposed in said plug for filtering particles as air moves into said first bore while said bolt carrier moves toward said firing position.

13. A firearm as set forth in claim 2 wherein said expulsion device includes a biasing member abutting said buttstock and said piston for absorbing energy and continuously biasing said piston into engagement with said bolt carrier and into said firing position.

14. A firearm as set forth in claim 13 wherein said piston includes a shoulder between said front and back ends and said buttstock includes a distal end spaced from said receiver along said longitudinal axis with said biasing member abutting said shoulder and said distal end of said buttstock.

15. A firearm as set forth in claim 1 wherein said first and second bores align with each other relative to said longitudinal axis for allowing said bolt carrier to partially move into said first bore during movement toward and away from said rearward position.

16. A firearm as set forth in claim 1 wherein said expulsion device is entirely disposed in said buttstock.

17. A firearm as set forth in claim 16 wherein said buttstock includes a stock and a container disposed within said stock with said container housing said entire expulsion device.

18. A method of operating a firearm having a buttstock defining a first bore and a receiver coupled to the buttstock and defining an ejection port and a second bore in fluid communication with the first bore and a bolt carrier disposed in the second bore and movable between a firing position and a rearward position with a piston disposed in the first bore and defining a hole with a first valve attached to the piston adjacent the hole;

said method comprising the steps of;

firing the firearm;

simultaneously moving the piston and the bolt carrier toward the rearward position after firing the firearm;

opening the first valve during movement of the piston and the bolt carrier toward the rearward position;

directing air through the hole of the piston and the second bore of the receiver during movement of the piston and the bolt carrier toward the rearward position; and

expelling the air from the hole and the second bore out the ejection port of the receiver.

19. A method as set forth in claim 18 wherein the step of opening the first valve is further defined as spacing the first valve away from the hole during movement of the piston and the bolt carrier toward the rearward position.

20. A method as set forth in claim 18 further including a second valve attached to the buttstock and further including the step of simultaneously opening the second valve and closing the first valve during movement of the piston and the bolt carrier toward the firing position.

21. A method as set forth in claim 20 wherein the step of opening the first valve during movement of the piston and the bolt carrier toward the rearward position occurs before the step of simultaneously opening the second valve and closing the first valve during movement of the piston and the bolt carrier toward the firing position.

22. A method as set forth in claim 20 wherein the buttstock defines an aperture open to the first bore with the second valve adjacent the aperture and wherein the step of simultaneously opening the second valve and closing the first valve is further defined as spacing the second valve from the aperture and engaging the first valve against the hole during movement toward the firing position.

23. A method as set forth in claim 22 further including the step of flowing air through the aperture and into the first bore during movement of the piston and the bolt carrier toward the firing position.

24. A method as set forth in claim 23 wherein the step of flowing air through the aperture and into the first bore occurs after the step of expelling the air from the hole and the receiver out the ejection port.

25. A method as set forth in claim 18 further including a weight disposed in the hole of the piston and defining an orifice open to the hole and further including the step of directing air through the hole and the orifice during movement of the piston and the bolt carrier toward the rearward position.

26. A method as set forth in claim 18 further including the step of continuously biasing the piston and the bolt carrier toward the firing position.

27. A magazine repair system for a firearm with the system including a plurality of rounds and a receiver defining a void with a barrel attached to the receiver and defining a chamber for receiving the rounds;

said system comprising;

a buttstock adapted to be coupled to the receiver and having an outer surface;

a magazine for housing the rounds and adapted to selectively engage the void of the receiver with said magazine including a top portion having a pair of tabs extending outwardly from said top portion for feeding the rounds into the chamber of the barrel; and

a guide member attached to said outer surface of said buttstock and configured to reform said tabs when said tabs are deformed relative to said top portion for properly positioning said tabs to permit proper feeding of the rounds into the chamber of the barrel.

28. A system as set forth in claim 27 wherein said guide member defines a first channel and a second channel spaced from said first channel to define a central body between said first and second channels with said first and second channels selectively receiving said tabs.

29. A system as set forth in claim 28 wherein said central body includes a first end and a second end spaced from each other with said first end having a tapered portion for guiding said tabs into said first and second channels.

30. A system as set forth in claim 28 wherein said first and second channels each have an arcuate inward configuration corresponding to said proper position of said tabs relative to said top portion with said tabs being reformed to a correspondingly arcuate inward configuration as said tabs move through said first and second channels.

31. A system as set forth in claim 27 wherein said outer surface defines a recess with said guide member attached to said buttstock within said recess.