NOISE REDUCING BOOSTER INSERT
A noise reducing booster insert of a sound suppressor coupled to a barrel of a firearm includes an elongate body, a plurality of gas vents, and a plurality of indexing spokes. The gas vents permit expanding gases from the firearm to fill a space about the body to thereby increase noise reduction without the need of modifying a baffle stack of the sound suppressor. The gas vents are angled such that the expanding gases force the booster insert to rotate into tighter threaded engagement with the barrel of the firearm.
1. Field of Invention
This device relates to handgun sound suppressors, specifically to coupling attachments which are threadedly secured about a handgun barrel which are designed to aid in sound reduction when used in conjunction with a noise suppressor. Further, this device aids in the prevention of the sound suppressor from unthreading from the handgun barrel due to the incidental vibrations related to discharging the firearm.
2. Prior Art
There is always a need to improve the sound reduction of a sound suppressor. Generally inventors focus on improving baffle design. The device of the invention works by manipulating the expanding gases exiting a firearm prior to contact with the blast baffle.
Previous systems exist for attaching a sound suppressor to a handgun barrel. Devices such as the A.S.A.P system, commercially available from Advanced Armament Corp. of Norcorss, Ga., utilize a threaded insert which rest within a cylindrical housing located at the back end of a silencer. Through the use of vent holes around the periphery, the expanding gases from the discharging firearm fill a booster chamber and assist the handgun during its firing cycle.
Another design is the Linear Inertial Decoupler device commercially available from Gemini Technologies, Inc. of Boise Id., which is similar to the Advanced Armament A.S.A.P system. Both designs are incorporated into the rear of the silencer and simply provide a means to cycle a handgun during its semi-automatic firing cycle. Some sound reduction may be gained from these designs but the noise inherent to the threaded insert being forced around inside of its housing also generates noise in its own right.
There is always a demand for increased noise reduction from a sound suppressor. While the above represent designs which are functional for their primary purpose, to operate semi-automatic handguns, they do not provide for optimal sound reduction. The design of this invention addresses this later concern with the capability of being adapted to function as an insert in most booster designs.
Vibration resulting from the discharge of the host weapon can cause a sound suppressor which is threadedly secured about a handgun barrel to unscrew. Sound suppressor manufacturers currently address this deficiency by tightening the specifications of the threaded insert. This tightening works with varying degrees of success, but always leaves the potential of not being universally compatible with a variety of manufacturers' handgun barrels. There is a need for a method of securing a thread mount sound suppressor onto a hand gun barrel which is neither permanent nor dependant on a tight thread specification.
OBJECTS AND ADVANTAGESAccordingly, several objects and advantages of the present invention are (a) To provide an apparatus which will increase the sound suppression capability of a noise suppressor without modifying the baffle stack; (b) To provide an apparatus which improves the performance of a sound suppressor and can be easily adapted to existing sound suppressor booster designs; and (c) To provide an apparatus which, when incorporated onto the thread insert of a sound suppressor booster, will help rotationally restrain the sound suppressor while the handgun is being discharged.
Still further objects and advantages will become apparent from a consideration of the ensuing description and drawings.
SUMMARYIn general terms the proposed apparatus is a threaded insert referred to commonly as a piston. This threaded insert when used with a sound suppressor is designed to threadedly secure the noise suppressor onto the barrel of a handgun.
Two features have been designed into the piston, but are not limited to use with the booster system which is associated with a preferred embodiment. The piston includes five vents which run parallel to the longitudinal path of the bore. The five vents are cut into the piston body at a 72 degree angle from a radial direction. The 72 degree angle of the vents are machined to follow the direction of the specified thread pitch located on the thread mount portion of the piston. If the piston has a right hand thread then the vents are cut to face the right for example. By machining the vents at a 72 degree angle from a radial direction the expanding gases passing from the discharging firearm are being redirected to the side of bore line. This redirection more effectively utilizes the noise suppressor's internal volume thereby providing more time for the gases to cool. Turbulence is created by this venting of gases allowing the associated gases more time to cool and expand thereby reducing the sound and flash signature of the host firearm. As the gases pass over the angled area of the five vents, the piston and thereby the noise suppressor are being forced to rotate in the same direction which will tighten the piston onto the handgun barrel. The proposed apparatus is not limited to the specific angle, or number of vents outlined above.
The novel features believed to be characteristic of the invention, together with further advantages thereof, will be better understood from the following description considered in connection with the accompanying drawings, in which a preferred embodiment of the present invention is illustrated by way of example. It is to be expressly understood, however, that the drawings are for the purpose of illustration and description only, and are not intended as a definition of the limits of the invention.
Turning now to the drawings in which like reference characters indicate corresponding elements throughout the several views, attention is directed to
In
In
Illustrated in
As used herein, the word “front” or “forward” corresponds to the firing direction of the firearm (i.e., to the right as shown in
The pitch and diameter of the barrel 7 are not confined to the M13.5×1LH specification illustrated with the preferred embodiment of the piston 1. It should be noted that any popular thread pitch that can be machined on the piston 1 to work with any threaded barrel 7.
Prior to discharging the host firearm 5 the piston 1 and the noise suppressor 6 are in a first position. When the firearm discharges, the noise suppressor 6 is filled with expanding gases, which force the noise suppressor 6 forward with respect to the piston 1 and the barrel 7 against the bias of the spring 11. The spring 11 is compressed in this second position of the noise suppressor 6.
More specifically, discharging a firearm 5 forces gases and a bullet through the barrel 7 and piston 1. As the gases enter the piston 1, the gas vents 3 located about the periphery of the piston 1 direct some of the expanding gases to the chamber located about the piston 1 and within the noise suppressor 6. The bullet will pass along the longitudinal axis a-a unobstructed through the noise suppressor 6. As the expanding gases fill the area around the periphery of the piston 1, the gases place forward pressure against the noise suppressor 6 while at the same time forcing the action of the firearm 5 to travel in a rearward path, effectively placing the noise suppressor 6 in the second position. The spring 11 resists the forward movement of the noise suppressor 6, and once the gases have begun to exit the noise suppressor 6, the spring 11 forces the noise suppressor 6 back to the first position. Furthermore, while the gases are passing through the gas vents 3, pressure is being applied against the angled vent side edges 15 to force the piston 1 in a rotational direction that tends to tighten the piston 1 onto the barrel 7 and the threads 4. This is superior to other designs which do not utilize this force that is inherent to the use of a firearm 5.
Gases which result from discharging a firearm 5 contain unburnt powder particles. As these gun powder particles contact oxygen, they can combust to create flash and sound. Directing the expanding gases to pass through the angled vent side edges 15 of the piston 1 slows the velocity of the gas particles and cools the gas. By slowing and cooling the gases, overall combustion of unburnt gun powder is reduced, thereby effectively reducing the overall flash and sound signature of the host noise suppressor 6.
CONCLUSION, RAMIFICATIONS, AND SCOPEAccordingly the reader will see that the apparatus of the invention, when incorporated into a noise suppressor 6 will further reduce the overall sound signature of a discharging firearm 5. As a secondary benefit the expanding gases from the discharging firearm 5 will apply pressure to the angled gas vents 3 on the piston 1 effectively resisting the natural tendency of the piston 1 to threadedly disconnect from the firearm 5 because of the incidental vibration of a discharging firearm 5.
While the above drawings and description contain many specificities, these should not be construed as limitations on the scope of the invention, but rather as an exemplification of one preferred embodiment thereof. For example, the design is not limited to working with Advanced Armament Corporation's A.S.A.P system, previously described. The angled rectangle cuts, key to the sound reduction benefit, can be incorporated into other sound suppressor booster designs. In this regard, an insert for a sound suppressor which does not utilize a moving piston is another possibility for the design.
Accordingly, the scope of the invention should be determined not by the embodiments illustrated, but by the appended claims and their legal equivalents.
Claims
1-9. (canceled)
10. A noise reducing piston for a firearm sound suppressor booster configured for use with a firearm having a barrel, the piston comprising:
- an elongated body defining a rear end, a forward end, a peripheral surface, and a longitudinal axis;
- a central bore through the body extending from the rear end to the forward end and sized to allow passage of a projectile fired from the barrel;
- internal threads adjacent the rear end of the body and configured to couple the body to the barrel;
- a plurality of elongate gas vents disposed forward of the internal threads and extending from the central bore to the peripheral surface, each gas vent being elongated only in a direction substantially parallel to the longitudinal axis of the body; and
- a plurality of indexing spokes disposed on the peripheral surface of the body forward of the gas vent and the gas vents permit expansion of gases accompanying discharge of the firearm into a space between the peripheral surface of the body and the sound suppressor.
11. The noise reducing piston of claim 10, wherein the plurality of gas vents are substantially equally spaced circumferentially around the peripheral surface of the body.
12. The noise reducing piston of claim 10, wherein the internal threads are rotated for tightening in a first direction and side edges of the vents are angled in a corresponding direction such that expanding gases passing through the plurality of gas vents tends to rotate the body in the first direction and tighten the coupling between the body and the barrel of the firearm.
13. The noise reducing piston of claim 10, wherein the plurality of indexing spokes are configured to retain the sound suppressor in a desired rotational orientation.
14. A sound suppressor configured for use with a firearm having a barrel, the sound suppressor comprising:
- a sound suppressor body having a rear end;
- a sound suppressor booster including a longitudinally slidable piston disposed in the suppressor body, said piston comprising: an elongated piston body defining a rear end, a forward end, a peripheral surface, and a longitudinal axis; a central bore through the piston body extending from the rear end to the forward end and sized to allow passage of a projectile fired from the barrel; internal threads adjacent the rear end of the piston body and configured to couple the piston body to the barrel; a plurality of elongate gas vents disposed forward of the internal threads and extending from the central bore to the peripheral surface, each gas vent being elongated only in a direction substantially parallel to the longitudinal axis of the piston body; and a plurality of indexing spokes disposed on the peripheral surface of the piston body forward of the gas vent and defining an interior diameter of the sound suppressor booster; and
- a spring disposed about the body of the piston and within the silencer body,
- wherein the sound suppressor is configured to slide forward from a first position to a second position, compressing the spring, when a projectile is fired from the firearm and the gas vents permit expansion of gases accompanying discharge of the firearm into a space between the peripheral surface of the piston body and an interior surface of the suppressor body.
15. The sound suppressor of claim 14, the piston body comprising a plurality of gas vents substantially equally spaced circumferentially around the peripheral surface of the body.
16. The sound suppressor of claim 14, wherein the internal threads are rotated for tightening in a first direction side edges of the vents are angled in a corresponding direction such that expanding gases passing through the plurality of gas vents tends to rotate the piston body in the first direction and tighten the coupling between the piston body and the barrel of the firearm.
17. The sound suppressor of claim 14, wherein the plurality of indexing spokes are configured to retain the sound suppressor in a desired rotational orientation.
Type: Application
Filed: Oct 3, 2007
Publication Date: Mar 17, 2011
Inventor: Kevin Tyson Brittingham (Norcross, GA)
Application Number: 11/906,652
International Classification: F41A 21/30 (20060101);