Heat shielding and thermal venting system

A heat shielding and thermal venting system, having a heat shielding element comprising an elongate, tubular member extending from a first end to a second end; a primary portion formed within a cavity of the heat shielding element; a secondary portion formed within the cavity of the heat shielding element, wherein the secondary portion has a reduced inner cross-sectional area when compared to an inner cross-sectional area of the primary portion; a plurality of entry apertures formed through the heat shielding element proximate the first end; a flare portion formed at the second end; and one or more restricted portions formed along the heat shielding element, wherein each restricted portion includes a reduced inner cross-sectional area, when compared to an inner cross-sectional area of an adjacent interior portion of the heat shielding element.

Not Applicable.

Not Applicable.

NOTICE OF COPYRIGHTED MATERIAL

The disclosure of this patent document contains material that is subject to copyright protection. The copyright owner has no objection to the reproduction by anyone of the patent document or the patent disclosure, as it appears in the Patent and Trademark Office patent file or records, but otherwise reserves all copyright rights whatsoever. Unless otherwise noted, all trademarks and service marks identified herein are owned by the applicant.

BACKGROUND OF THE INVENTION

1. Field of the Invention

The present disclosure relates generally to the field of firearms. More specifically, the present invention relates to a heat shielding and thermal venting systems for firearms.

2. Description of Related Art

It has become commonplace to attach a free floating or other tube or rail systems to the upper receiver of a rifle or other firearm, to be used as a handguard. In most applications, the handguard is attached to the firearm so that it extends from an upper receiver of the firearm and surrounds at least a portion of the firearm barrel.

Typically, such handguard are formed from aluminum or other alloys because of the ease with which the material can be extruded, cut to length, and machined. Furthermore, aluminum offers great strength to weight properties and is robust enough for the most demanding of requirements.

BRIEF SUMMARY OF THE INVENTION

However, in order to maintain a relatively compact and manageable outer diameter to the handguard to facilitate better shooting positions, the relative diameters of handguards are typically reduced. In all handguards, and particularly in handguards having a reduced diameter, heat buildup from the proximity of the handguard to the barrel becomes an increasing issue.

The present invention comprises various embodiments of a heat shield tube that provides a ducted thermal extraction system for at least a portion of the firearm. In certain exemplary, nonlimiting embodiments, the heat shield tube is positioned inside a free float or other firearm handguard. The heat shield tube extends over the barrel, gas tube, gas block, and optionally at least a portion of an attached muzzle device and/or suppressor and stops heat from escaping to the handguard and the shooter's hand.

Accordingly, the presently disclosed invention provides a heat shielding and thermal venting system that provides barrel cooling and heat shielding for a firearm.

The presently disclosed invention separately provides a heat shielding and thermal venting system that surrounds at least a portion of the barrel, gas tube, and/or gas block so there is a reduced heat build up to the barrel and/or handguard.

The presently disclosed invention separately provides a heat shielding and thermal venting system that surrounds at least a portion of the barrel, gas tube, and/or gas block so there is a reduced heat signature to the handguard.

The presently disclosed invention separately provides a heat shielding and thermal venting system that may optionally include various inlet openings, holes, or ducts formed in the tube wall, which to allow air ingress at optimum locations.

The presently disclosed invention separately provides a heat shielding and thermal venting system, which does not affect the free float characteristics of the handguard.

These and other aspects, features, and advantages of the present invention are described in or are apparent from the following detailed description of the exemplary, non-limiting embodiments of the present invention and the accompanying figures. Other aspects and features of embodiments of the present invention will become apparent to those of ordinary skill in the art upon reviewing the following description of specific, exemplary embodiments of the present invention in concert with the figures.

While features of the present invention may be discussed relative to certain embodiments and figures, all embodiments of the present invention can include one or more of the features discussed herein. Further, while one or more embodiments may be discussed as having certain advantageous features, one or more of such features may also be used with the various embodiments of the invention discussed herein. In similar fashion, while exemplary embodiments may be discussed below as device, system, or method embodiments, it is to be understood that such exemplary embodiments can be implemented in various devices, systems, and methods of the present invention.

Any benefits, advantages, or solutions to problems that are described herein with regard to specific embodiments are not intended to be construed as a critical, required, or essential feature(s) or element(s) of the present invention or the claims.

DETAILED DESCRIPTION OF THE INVENTION

For simplicity and clarification, the design factors and operating principles of the heat shielding and thermal venting system and the heat shielding element according to the present disclosure are explained with reference to various exemplary embodiments of a heat shielding and thermal venting system and heat shielding element according to the present disclosure. The basic explanation of the design factors and operating principles of the heat shielding and thermal venting system and/or the heat shielding element is applicable for the understanding, design, and operation of the present invention. It should be appreciated that the present invention can be adapted to many applications where heat shielding and/or thermal venting can be used.

As used herein, the word “may” is meant to convey a permissive sense (i.e., meaning “having the potential to”), rather than a mandatory sense (i.e., meaning “must”). Unless stated otherwise, terms such as “first” and “second” are used to arbitrarily distinguish between the elements such terms describe. Thus, these terms are not necessarily intended to indicate temporal or other prioritization of such elements.

The term “coupled”, as used herein, is defined as connected, although not necessarily directly, and not necessarily mechanically. The terms “a” and “an” are defined as one or more unless stated otherwise.

It should also be appreciated that the terms “handguard”, “heat shielding”, “thermal venting”, and “heat shielding element” are used for basic explanation and understanding of the operation of the systems, methods, and apparatuses of the present disclosure. Therefore, the terms “handguard”, “heat shielding”, “thermal venting”, and “heat shielding element” are not to be construed as limiting the systems, methods, and apparatuses of the present disclosure. Thus, for example, the term “heat shielding element” is to be understood to broadly include any elongate, hollow portion of material capable of being attached or coupled to an object.

For simplicity and clarification, the heat shielding and thermal venting system and the heat shielding element of the present disclosure will be described as being used in conjunction with the upper receiver and barrel of a firearm, such as a rifle or carbine. However, it should be appreciated that these are merely exemplary embodiments of the heat shielding and thermal venting system and the heat shielding element and are not to be construed as limiting the present disclosure.

Turning now to the drawing FIGS.,FIG. 1illustrates certain components of an AR-15 style upper receiver, without a handguard, whileFIG. 2illustrates certain components of an AR-15 style upper receiver, having an attached, free float handguard.

Generally, a barrel50is aligned with and inserted into the upper receiver10. A gas tube52extends between the upper receiver10and a gas block55. A muzzle device57, such as a flash hider, flash suppressor, compensator, or muzzle brake is typically secured to the barrel50.

While not illustrated inFIG. 2, the barrel50is typically secured to the upper receiver10via interaction of a threaded portion of the upper receiver10and an internally threaded barrel nut.

The free float handguard60is typically attached to the standard barrel nut, a modified barrel nut, or the threaded portion of the upper receiver10.

It should also be appreciated that a more detailed explanation of the components of the upper receiver10, lower receiver20, barrel50, barrel nut, gas tube52, gas block55, muzzle device57, and free float handguard60, instructions regarding how to attach and/or remove the various components and other items and/or techniques necessary for the implementation and/or operation of the various components of the AR-15 platform are not provided herein because such components are commercially available and/or such background information will be known to one of ordinary skill in the art. Therefore, it is believed that the level of description provided herein is sufficient to enable one of ordinary skill in the art to understand and practice the present invention as described.

FIGS. 3-7illustrate certain elements and/or aspects of an exemplary embodiment of a heat shielding and thermal venting system100, according to the present disclosure. As illustrated inFIGS. 3-7, the heat shielding and thermal venting system100comprises at least some of a duct or heat shielding element110, comprising an elongate, substantially tubular member extending along a longitudinal axis, AL, from a first end112to a muzzle end or second end115. The heat shielding element110is formed so as to be attached or coupled, via interaction with a rail extension/accessory connection system, within at least a portion of the interior of a handguard160. In various exemplary embodiments, the rail extension/accessory connection system comprises a barrel nut, such as exemplary barrel nut70.

In certain exemplary embodiments, the heat shielding element110extends from the first end112and encases the entire barrel50, gas tube52, and gas block55. However, it should be appreciated that the heat shielding element110may only extend to encase a portion of the barrel50, gas tube52, and/or gas block55.

As further illustrated inFIGS. 3-7, the heat shielding element110includes a primary portion117and a secondary portion119. The primary portion117and the secondary portion119are in continuous, fluid communication with one another.

The primary portion117has a main interior cavity portion113having an inner height HMthat is sized so as to allow at least a portion of the barrel50, gas tube52, and gas block55to be contained within the main interior cavity portion113of the primary portion117. The secondary portion119has a barrel interior cavity portion114having an inner, vertical height HBthat is sized so as to allow at least a portion of the barrel50and/or the muzzle device150to be contained within the barrel interior cavity portion114of the secondary portion119.

In various exemplary embodiments, the primary portion117and the secondary portion119have a combined interior cavity portion and an exterior surface that generally form an offset composite shape of the barrel50, gas tube52, gas block55, and muzzle device150. In this manner, the main interior cavity portion113and the barrel interior cavity portion114provide a smooth transition for the flow of fluid through the heat shielding element110. Additionally, the shape allows the assembled barrel50gas tube52, gas block50, and muzzle device150to be inserted within the composite cavity of the heat shielding element110.

Thus, in various exemplary embodiments, the secondary portion119has a reduced inner cross-sectional area when compared to an inner cross-sectional area of the primary portion117.

The wall thickness of the heat shielding element110can be varied at various points or in various areas to provide increased strength and/or to lighten the heat shielding element110, as desired.

In various exemplary embodiments, one or more entry apertures130are formed proximate the first end112of the heat shielding element110. As illustrated, the entry apertures130may comprise a series of varying diameter holes formed through the heat shielding element110. Alternatively, the entry apertures130may comprise one or a series of substantially similar or varying diameter holes formed through the heat shielding element110. Thus, it should be appreciated that the number, shape, and size of the entry apertures130is a design choice based upon the desired appearance and/or functionality of the entry apertures130.

The entry apertures130allow air to flow from outside the heat shielding gas tube110into the main interior cavity portion113of the heat shielding gas tube110.

As further illustrated, the heat shielding element110is positioned between the handguard160and the barrel50, so as to form a thermal barrier between the handguard160and the barrel50. In various exemplary embodiments, the heat shielding element110is positioned so that the barrel50does not contact the heat shielding element110. In this manner, the heat shielding element110does not interfere with or affect the free float characteristics of the barrel50.

The shaping of the flare portion116of the second end115may be substantially circular or may be flared or widens laterally, perpendicular to the longitudinal axis of the heat shielding element110, forming a virtual air scoop proximate the second end115. The flare portion116is shaped so as to allow blast gasses escaping from the muzzle device150to create a vacuum or air pressure differential behind the blast. The created vacuum draws warm air out of the heat shielding element110and draws typically cooler, outside air into the main interior cavity portion113, through the one or more entry apertures130, as shown most clearly by the arrows illustrating airflow inFIG. 7.

In various exemplary embodiments, a substantially oval or oblong fitting works in connection with the muzzle device150, such that blast gasses are directed at approximately 90° relative to the bore axis of the firearm (or longitudinal axis, AL, of the heat shielding element110), using the Bournelli effect to extract air from the cavity of the heat shielding element110. The interaction of the muzzle device150and the shape of the flare portion116act to create an “aircraft wing” like suction, using the Bournelli effect.

Because of the variable diameter and internal shape of the cavity of the heat shielding element110, a Venturi effect is created within the cavity of the heat shielding element110, causing air motion to speed up in constricted areas, enhancing the draw, or flow, of air and cooling. Because of the principle of conservation of momentum, the Venturi effect created within the interior cavity of the heat shielding element110(as defined by the main interior cavity portion113and the barrel interior cavity portion114) means that as air moves through the interior cavity of the heat shielding element110, fresh, outside, ambient air is drawn into the cavity of the heat shielding element110behind it.

It should be appreciated that these airflow affects may be either passive (i.e., occurring without interaction from firing the weapon) or active (i.e., occurring through the act of firing the weapon and utilizing blast gas in operation).

Interchangeable ‘fittings’ with different shape designs may be incorporated proximate the second end115of the heat shielding element110, causing different muzzle devices150to work in different ways.

Thus, if the firearm is fired, either Venturi or Bernoulli effects cause the faster muzzle gas to draw warm air from around the barrel50, through the second end115, where it is mixed with the blast gas and removed. At the same time, typically cooler, ambient air is drawn through the one or more entry apertures130and into the interior of the heat shielding element100.

It should be appreciated that while the entry apertures130are primarily shown and described as being circular or oval, and formed proximate the first end112of the heat shielding element110, any number of entry apertures130may be formed at any position along the heat shielding element110and may take any desired size, shape, or form.

Because of the configuration of the cavity of the heat shielding element110, airflow can be created within the cavity of the heat shielding element100between the one or more entry apertures130and the open second end115. This results in the creation of a ‘stack effect’ or ‘chimney effect’ by the temperature and pressure difference between warmer air within the cavity of the heat shielding element110and cooler, ambient temperature air outside the heat shielding element110, as hot air rises and draws in cooler air from outside. When the firearm and handguard/heat shield tube assembly are elevated or lowered a ‘stack effect’ is induced similar to a chimney or flue system.

Thus, due to the chimney like nature of the design, when the firearm is generally pointed upward or downward, cooler, ambient air from outside the heat shielding element100is drawn in at the bottom-most end as the heat rises. This results in an efficient cooling system as the cooler air is drawn into the cavity of the heat shielding element100(either through the one or more entry apertures130or the second end115—depending on which end is pointed downward) and directed along the entire length of the barrel50, the gas tube52, the gas block55, and the muzzle device150, where continuous convective heat transfer results in effective cooling. Here cooler atmospheres air moves into the tube at either its base or mouth (depending on orientation) and a positive buoyancy force is created. Warm air is moved up the tube while cool air enters. This creates a very efficient draft of cooling air across the surface of the barrel within the heatshield tube and decreases cooling time. This flow of air is generated regardless of whether the firearm is pointed upward or downward.

In various exemplary, nonlimiting embodiments, the heat shielding element110is formed of a carbon fiber. Rated to at least 2,200 degrees Fahrenheit the unique heat shielding and thermal venting system100.

In various exemplary embodiments, the heat shielding element110is substantially rigid and is formed of a heat resistant composite material including, for example, carbon fiber and SiC, a silicon carbide compound composed of tetrahedra of carbon and silicon atoms with strong bonds in the crystal lattice. SiC is a particular type of Ceramic Matrix Composite (CMC). CMC composites are lightweight, very strong with very low thermal conductivity making them functional for this application. Alternate materials of construction of the various components of the heat shielding element110may include one or more of the following: steel, stainless steel, aluminum, titanium, and/or other metals, as well as various alloys and composites thereof, plastic, glass-hardened polymers, polymeric composites, polymer or fiber reinforced metals, carbon fiber or glass fiber composites, carbon fiber resin, continuous fibers in combination with thermoset and thermoplastic resins, chopped glass or carbon fibers used for injection molding compounds, laminate glass or carbon fiber, epoxy laminates, woven glass fiber laminates, impregnate fibers, polyester resins, epoxy resins, phenolic resins, polyimide resins, cyanate resins, high-strength plastics, nylon, glass, or polymer fiber reinforced plastics, thermoform and/or thermoset materials, and/or various combinations of the foregoing. Thus, it should be understood that the material or materials used to form the various components of the heat shielding element110is a design choice based on the desired appearance and functionality of the heat shielding element110.

It should be appreciated that certain elements of the heat shielding element110may be formed as an integral unit. Alternatively, suitable materials can be used and sections or elements of the heat shielding element110may be made independently and attached or coupled together, such as by frictional engagement, adhesives, welding, screws, rivets, pins, or other fasteners, to form the heat shielding element110.

By providing improved cooling and by surrounding the barrel50and related components, there is a significant reduction to the thermal signature of the barrel50and the related components, as the heat shielding element110retains considerable heat. In various exemplary embodiments, insulation material can be fitted around the heat shielding element110, either inside or outside the cavity, between the heat shielding element110and the handguard160, to further reduce the thermal signature of the firearm.

FIG. 8illustrates a partial cutaway front perspective view of an exemplary embodiment of a heat shielding and thermal venting system200, according to the present disclosure. As illustrated inFIG. 8, the heat shielding and thermal venting system200comprises at least some of a heat shielding element210extending from a first end212(not shown) to a muzzle end or second end215, a main interior cavity portion213, a barrel interior cavity portion214, a flare portion216, a primary portion217, a secondary portion219, and one or more entry apertures230(not shown).

It should be understood that each of these elements corresponds to and operates similarly to the heat shielding element110extending from the first end112to the muzzle end or second end115, the main interior cavity portion113, the barrel interior cavity portion114, the flare portion116, the primary portion117, the secondary portion119, and the one or more entry apertures130, as described above with reference to the heat shielding and thermal venting system100ofFIGS. 3-7.

However, as illustrated inFIG. 8, as the heat shielding element210nears the second end215(or the muzzle end of the barrel50), the heat shielding element210is formed into one or a series of shapes that restrict or expand the airflow within a defined portion of the heat shielding element210. Depending on the shape and position relative to the muzzle device150, a variety of physical effects like Venturi and Bernoulli can be exploited to extract warm air from the cavity of the heat shielding element210.

As illustrated inFIG. 8, a Venturi constriction or restricted portion218is formed as a ‘pinch point’ or reduced diameter section within the secondary portion219. It should be appreciated that one or more restricted portions218may be formed in the primary portion217, the secondary portion219, and/or a transition area between the primary portion217and the secondary portion219.

Each restricted portion218includes a portion or area having a reduced inner cross-sectional area when compared to an inner cross-sectional area of an adjacent interior portion of the heat shielding two210.

The inclusion of one or more restricted portions218provides areas within which the Venturi effect is particularly present. Based on the Venturi effect, as the airflow moves into, through, and out of the restricted portion218, the velocity of the airflow is increased and the pressure and temperature of the airflow are decreased, when compared to the airflow within the cavity on either side of the restricted portion218. This further improves the cooling provided by the heat shielding element210.

As further illustrated inFIG. 9, the Venturi constriction or restricted portion218is formed as a ‘pinch point’ or reduced diameter section within the primary portion217of the heat shielding element110to induce a Venturi effect within the primary portion217. In accordance with the principle of continuity, the velocity of a fluid (gas or air) increases as it passes through the restricted portion218. The reduced diameter section (the restricted portion218) may have an entry cone at, for example, approximately 20 to 30 degrees (Convergent) and an exit cone at approximately 5 to 15 degrees (Divergent) to reduce drag. This causes airflow to increase in velocity relative to the diameter of the interior cavity of the heat shielding element210and assists in airflow throughout the heat shielding element210by creating a vacuum on the divergent side.

In various exemplary embodiments, additional holes or apertures (not shown) may be formed in the heat shielding element210at or proximate the restricted portion218to allow cooler atmospheric air to be drawn into the interior cavity of the heat shielding element210.

FIGS. 10-11illustrate an exemplary embodiment of a heat shielding and thermal venting system300, according to the present disclosure. As illustrated inFIGS. 10-11, the heat shielding and thermal venting system300comprises at least some of a heat shielding element310extending from a first end312to a muzzle end or second end315, a flare portion316, a primary portion317, a secondary portion319, and one or more entry apertures330. Additionally, the heat shielding element310may optionally include one or more restricted portions318(not shown).

It should be understood that each of these elements corresponds to and operates similarly to the correspondingly named elements, as described above with reference to the heat shielding and thermal venting systems100and200ofFIGS. 3-9.

However, as illustrated inFIGS. 10-11, the flare portion316extends to form an extended flare portion340that encloses all or a portion of the muzzle device150.

FIGS. 12-17illustrate an exemplary embodiment of a heat shielding and thermal venting system400, according to the present disclosure. As illustrated inFIGS. 12-17, the heat shielding and thermal venting system400comprises at least some of a heat shielding element410extending from a first end412to a muzzle end or second end415, a flare portion416, a primary portion417, a secondary portion419, and one or more entry apertures430. Additionally, the heat shielding element410may optionally include one or more restricted portions418(not shown).

It should be understood that each of these elements corresponds to and operates similarly to the correspondingly named elements, as described above with reference to the heat shielding and thermal venting systems100,200, and/or300ofFIGS. 3-11.

However, as illustrated inFIGS. 12-17, the entry apertures430optionally comprise a plurality of substantially rectangular apertures formed through the heat shielding element410proximate the first end412. Additionally, a substantially smooth transition is provided between the primary portion417and the secondary portion419, providing for enclosure of the firearms gas block and gas tube.

It should be appreciated that the heat shielding element410(as with the heat shielding elements110,210, and/or310), may be provided in any desired length or overall external or internal profile.

As further illustrated inFIGS. 12-17, during installation, the heat shielding element410is initially aligned with and then inserted within the interior cavity of the handguard160. Once appropriately positioned within the handguard160, the heat shielding element410may be attached or coupled within the handguard160by various methods, such as by mere frictional engagement, adhesives, screws, pins, or other fasteners, to maintain the heat shielding element410in a desired position relative to the handguard160.

In various exemplary embodiments, when the heat shielding element410is appropriately positioned within the handguard160, the heat shielding element410is configured within the handguard160so that the one or more entry apertures430are at least partially aligned with one or more holes or apertures in the handguard160.

As illustrated most clearly inFIG. 18, in certain exemplary, nonlimiting embodiments, the one or more entry apertures130,230,330, and/or430may not be included. In these embodiments, the heat shielding element410′ may be positioned relative to the handguard160, the barrel50, and/or the barrel nut70so as to provide a gap430′ aft of the first end412′. In this manner, ambient, external air is able to enter into the cavity of the heat shielding element410′ via the gap430′.

FIGS. 19-27illustrate various exemplary embodiments of nozzle elements that can be utilized with the heat shielding and thermal venting systems of the present disclosure. As illustrated inFIGS. 19-27, an exemplary nozzle element500comprises a substantially tubular nozzle body510, which extends from a first end512to a second end515. A flare portion516extends from the second end515and a nozzle attachment protrusion518is formed in or extends from at least a portion of the nozzle body510.

An inner diameter of at least a portion of the first end512of the nozzle body510is formed so as to be attached or coupled to the second end415of the heat shielding element410. In various exemplary embodiments, the nozzle element500is slidably, frictionally attached to at least a portion of the second end415of the heat shielding element410. Alternatively, mating internal threads of the nozzle body510and external threads of the second end415of the heat shielding element410may be used utilized to threadedly attach or screw the nozzle element500to the heat shielding element410. Alternatively or in addition, the nozzle element500may be attached or coupled to the heat shielding element410by various methods, such as by mere frictional engagement, adhesives, screws, pins, or other fasteners.

In certain exemplary, nonlimiting embodiments, the nozzle element500may be additionally or exclusively maintained in position relative to the heat shielding element410and/or the handguard160through use of one or more mounting bolts or screws520positioned through the nozzle attachment aperture519formed in the nozzle attachment protrusion518and properly aligned apertures165formed in the handguard160. In these exemplary embodiments, the mounting bolts or screws520are positioned so as to be received through at least a portion of a handguard aperture165aligned with the nozzle attachment aperture519. In certain exemplary embodiments, a mounting bolt or screw520may only extend through an aligned handguard aperture165and the nozzle attachment aperture519. Alternatively, a mounting bolt or screw520may extend through an aligned handguard aperture165on a first side of the handguard160, through the nozzle attachment aperture519, and through at least a portion of an aligned handguard aperture165on a second side of the handguard160.

The nozzle attachment aperture519may comprise a substantially smooth aperture formed through the nozzle attachment protrusion518. Alternatively, the nozzle attachment aperture519may comprise a fully or partially internally threaded aperture.

The nozzle attachment protrusion518provides a portion of material that helps to isolate the nozzle body510from the handguard160. Thus, by attaching or coupling the nozzle element500to the handguard160, via the nozzle attachment protrusion518, potential heat transfer from the nozzle element500(and/or from the mounting bolt or screw520) to the handguard160is reduced.

The nozzle element500may be provided having different sizes, shapes, and links. Additionally, the size and shape of the flare portion516may vary so that the nozzle element500may be used in conjunction with a variety of muzzle devices and/or provide a variety of desired effects.FIGS. 24-27illustrate certain exemplary embodiments of a variety of nozzle elements500,500′,500″, and500′″. As illustrated, each of the nozzle elements500,500′,500″, and500′″ comprises a substantially tubular nozzle body510, which extends from a first end512to a second end515, a nozzle attachment protrusion518, and a nozzle attachment aperture519. These elements are as described above, with reference to the nozzle element500ofFIGS. 19-23.

However, as illustrated inFIGS. 24-27, each of the flare portions516,516′,516″, and516′″ has a slightly different overall size, shape, and/or profile. It should be appreciated that the overall size, shape, and/or profile of a nozzle element and/or flare portion is a design choice based upon the desired appearance and/or effect provided by the nozzle element. Thus, the Illustrated flare portions516,516′,516″, and516′″ should be viewed as exemplary and not limiting the present disclosure.

FIGS. 28-32illustrate an exemplary embodiment of a heat shielding and thermal venting system600, according to the present disclosure. As illustrated inFIGS. 28-32, the heat shielding and thermal venting system600comprises at least some of a heat shielding element610extending from a first end612to a muzzle end or second end615, a primary portion617, and one or more entry apertures630. Additionally, the heat shielding element610may optionally include one or more restricted portions618(not shown).

It should be understood that each of these elements corresponds to and operates similarly to the correspondingly named elements, as described above with reference to the heat shielding and thermal venting systems100,200,300, and/or400.

However, as illustrated inFIGS. 28-32, the primary portion617extends the entire length of the heat shielding element610, from the first end612to the second end615. Additionally, a heat shielding element attachment aperture614is formed proximate the second end615of the heat shielding element610. The heat shielding element attachment apertures614provides a mounting area or means.

Thus, through use of the heat shielding attachment aperture614, the heat shielding element610may be additionally or exclusively maintained in position relative to the handguard160through use of one or more mounting bolts or screws620positioned through the heat shielding element attachment apertures614formed in the heat shielding element610and properly aligned apertures165formed in the handguard160.

In these exemplary embodiments, the mounting bolts or screws620are positioned so as to be received through at least a portion of a handguard aperture165aligned with the heat shielding element attachment apertures614. In certain exemplary embodiments, a mounting bolt or screw620may only extend through an aligned handguard aperture165and the heat shielding element attachment aperture(s)614. Alternatively, a mounting bolt or screw620may extend through an aligned handguard aperture165on a first side of the handguard160, through the heat shielding element attachment apertures614, and through at least a portion of an aligned handguard aperture165on a second side of the handguard160.

The heat shielding element attachment apertures614may comprise a substantially smooth aperture formed through the heat shielding element610. Alternatively, the heat shielding element attachment apertures614may comprise a fully or partially internally threaded aperture.

FIGS. 33-38illustrate an exemplary embodiment of a heat shielding and thermal venting system700, according to the present disclosure. As illustrated inFIGS. 33-38, the heat shielding and thermal venting system700comprises at least some of a heat shielding element710extending from a first end712to a muzzle end or second end715, an optional flare portion716, a primary portion717, a secondary portion719, and one or more entry apertures730. Additionally, the heat shielding element710may optionally include one or more restricted portions718(not shown).

It should be understood that each of these elements corresponds to and operates similarly to the correspondingly named elements, as described above with reference to the heat shielding and thermal venting systems100,200,300, and/or400.

As illustrated inFIGS. 33-38, the entry apertures730optionally comprise a plurality of substantially rectangular apertures formed through the heat shielding element710proximate the first end712. Additionally, a substantially smooth transition is provided between the primary portion717and the secondary portion719, providing for enclosure of the firearms gas block and gas tube.

It should be appreciated that the heat shielding element710(as with the heat shielding elements110,210,310, and/or410), may be provided in any desired length or overall external or internal profile. It should also be appreciated that the heat shielding element710may be configured so as to optionally be attached or coupled to a nozzle element500,500′,500″, and/or500′″.

As illustrated, the heat shielding element710also includes a heat shielding element attachment protrusion770formed in or extending from at least a portion of the heat shielding element710. At least one heat shielding element attachment aperture772is formed through or at least partially through the heat shielding element attachment protrusion770.

During installation, the heat shielding element710is initially aligned with and then inserted within the interior cavity of the handguard160. Once appropriately positioned within the handguard160, the heat shielding element710is maintained in position relative to the handguard160through use of one or more mounting bolts or screws720(not shown) positioned through the heat shielding element attachment aperture772formed in the heat shielding element attachment protrusion770and properly aligned apertures165formed in the handguard160. In these exemplary embodiments, the mounting bolts or screws720(not shown) are positioned so as to be received through at least a portion of a handguard aperture165aligned with the heat shielding element attachment aperture772.

In certain exemplary embodiments, a mounting bolt or screw720(not shown) may only extend through an aligned handguard aperture165and the heat shielding element attachment aperture772. Alternatively, a mounting bolt or screw720(not shown) may extend through an aligned handguard aperture165on a first side of the handguard160, through the heat shielding element attachment aperture772, and through at least a portion of an aligned handguard aperture165on a second side of the handguard160.

The heat shielding element attachment aperture772may comprise a substantially smooth aperture formed through the heat shielding element attachment protrusion770. Alternatively, the heat shielding element attachment aperture772may comprise a fully or partially internally threaded aperture.

The heat shielding element attachment protrusion770provides a portion of material that helps to isolate the heat shielding element710from the handguard160. Thus, by attaching or coupling the heat shielding element710to the handguard160, via the heat shielding element attachment protrusion770, potential heat transfer from the heat shielding element710(and/or from the mounting bolt or screw720(not shown)) to the handguard160is reduced.

As further illustrated inFIGS. 34-38, the heat shielding and thermal venting system700utilizes a gas block800as part of the air circulation system within the cavity of the heat shielding element710. In various exemplary embodiments, the gas block800includes a gas block injector system comprising a pulse injector805that diverts a portion of exhaust gas that would traditionally be diverted through the gas tube52and delivers a pulse of exhaust gas pressure forward, through one or more nozzles810, into the cavity of the heat shielding element710as the firearm is fired. The delivered pulse of exhaust gas further increases and/or creates the Venturi effect within the heat shielding element710and further assists in drawing cool air forward, through the interior cavity of the heat shielding element710. Conservation of momentum means that as air moves through the cavity of the heat shielding element710, fresh or ambient outside air is drawn into the cavity of the heat shielding element710.

As illustrated inFIGS. 36-37, the gas block800uses dual gas port holes and two, corresponding apertures are drilled in the barrel to a determined size that is dependent on barrel length. In various exemplary embodiments, a shortened gas tube is used instead of a full-length gas tube.

Utilizing gas energy to move air through the heat shielding element710can produce conservation of momentum. For example, the gas block800may be used to direct propellant gas forwards as well as backwards. Propellant gas directed backward can be used, for example, to cycle the bolt carrier group of the firearm.

The forward venting gas block800sends at least a portion of the exhaust gas down the heat shielding element710towards the muzzle of the firearm and induces a venture effect that causes relatively cooler atmospheric air to be drawn into the heat shielding element710, through the one or more entry apertures730, to travel down the length of the featuring element710, behind the forward venting exhaust gas. This suction effect assists in cooling while the extra gas utilized in the operation softens the operating action of the firearm by reducing gas pressure, especially on shorter, more aggressive gas systems.

In various exemplary embodiments, the nozzle(s)810may be pointed forward, parallel to the longitudinal axis of the barrel or heat shielding element710. Alternatively, the nozzle(s)810may be pointed at slightly different angles to create a vortex effect of air inside the heat shielding element710.

Alternatively, as illustrated most clearly inFIG. 38, the pulse injector805′ may be incorporated into a modified gas block800′. In these exemplary embodiments, the modified gas block800′ may be used in combination with a modified gas tube52′, having an open end that allows exhaust gas to flow in both directions front and back. Thus, the pulse injector805′ may be a component of a stand-alone injector gas block800′ with one or more injector nozzles810′. Furthermore, the barrel50may have one, two, or more holes to feed exhaust gas to the modified gas block800′.

An adjustment device, such as, for example, an adjustment screw807′ may be positioned within at least a portion of the pulse injector805′ to meter the flow of forward ported gas down the heat shielding element710or the handguard160. By adjustment of the adjustment screw807′, the amount of exhaust gas pressure delivered through the one or more injector nozzles810′, in each pulse, can be adjusted, as desired.

FIGS. 39-49illustrate various exemplary embodiments of muzzle devices910,910′,920,920′, and930, according to the present disclosure. As illustrated inFIGS. 39-49, the muzzle devices910,910′,920,920′, and930each comprise one or more angled exhaust ports912,922, and932, respectively. The angled exhaust ports912,922, and932allow fluid communication between an interior and an exterior of the muzzle devices910,910′,920,920′, and930, respectively.

In various exemplary embodiments, the one or more angled exhaust ports912,922, and932are angled so as to divert a portion of the blast gases that are created during a firing cycle to exit the angled exhaust ports912,922, and932into the interior of the heat shielding element410at a forward facing angle to create a vacuum or air pressure differential behind the blast such that a Venturi Effect can be enhanced or created, causing air to move through the heat shielding element410, behind the vectored blast gas.

In various exemplary embodiments, certain of the muzzle devices, such as, for example, muzzle devices920and920′ optionally include a plurality of radial teeth924, that extend, at spaced apart locations, from the outside surfaces of the muzzle devices920and920′. The radial teeth924, if included, operate to disrupt the blast gas as it exits the heat shielding element410.

It should be appreciated that the muzzle devices910,910′,920,920′, and930may be muzzle brakes, flash hiders, silencer mounts, or combination of the foregoing. Thus, the muzzle devices910,910′,920,920′, and930may include a variety of muzzle device extension portions916,916′,926,926′, and936, respectively. Each of the muzzle device extension portions (or other, non-illustrated muzzle device extension portions) can provide a desired function, such as, for example, dissipation or vectoring of exhaust gases.

It should be appreciated that while the muzzle devices910,910′,920,920′, and930are illustrated as being used in conjunction with a heat shielding element410and nozzle body510′, these are merely exemplary heat shielding elements and nozzle bodies. Thus, it should be appreciated that each of the muzzle devices910,910′,920,920′, and930may optionally be used in conjunction with any of the embodiments of the heat shielding elements, with or without an associated nozzle body.

For example, as illustrated inFIGS. 42-44, the heat shielding and thermal venting system400includes a heat shielding element410comprising a free float high-temperature carbon fiber material having variable wall thicknesses and variable diameter, which surrounds the entire barrel50, gas tube52, and gas block800. The variable diameter increases the Venturi/Bernoulli Effect within the cavity of the heat shielding element410and further reduces heat transfer to the handguard160.

The nozzle body510′ is removable and replaceable and can be interchangeable such that the shape of the flare portion516can be altered for different applications. It should be appreciated that the flare portion616may be formed independently from the heat shielding element410and may be attached or coupled to the heat shielding element410by various methods, such as by frictional engagement, adhesives, welding, screws, rivets, pins, or other fasteners, to form a composite heat shielding element410.

The muzzle device920comprises a forward ported hybrid muzzle device that patterns gas forward and outward, creating a vacuum within the cavity of the heat shielding element410and/or flare portion516.

A flash cutter, comprising a series of alternating protrusions and valleys surrounds at least a portion of the muzzle device920. The flash cutter helps to further pattern the expelled exhaust gases in a desired direction.

Various exhaust ports of the muzzle device920direct the exhaust gasses in a desired direction (such as, for example, 25°, 30°, 35°, 40°, or 45° to the longitudinal or bore axis of the barrel50) to further enhance Bernoulli effect of the flare portion516.

Thus, the barrel50and muzzle device920remain free floated at all times and the forward angled exhaust ports922on the muzzle device920may optionally be position on the top and sides of the muzzle device920only, so that exhaust gas does not exit from the lower portion. This effect drives the barrel50down and combats muzzle rise from firing the weapon.

FIG. 50illustrates a cutaway front perspective view of an exemplary embodiment of an alternate nozzle element500′, according to the present disclosure. As illustrated inFIG. 50, the nozzle element500′ corresponds to and operates similarly to the nozzle element500, as described herein.

However, as illustrated inFIG. 50, a portion of the interior of the nozzle element500′ expands to a larger interior diameter so as to allow a cylindrical insert550to be fully or partially seated within the interior of the nozzle element500′. In various exemplary embodiments, the cylindrical insert550comprises a circular section of steel or other material. Thus, when inserted inside at least a portion of the nozzle element500′, the cylindrical insert550acts to protect the interior of the nozzle element500′ from blast gas erosion.

In various exemplary embodiments, the cylindrical insert550may be removed and replaced if it has been damaged or compromised by blast gas erosion.

FIG. 51illustrates a front perspective view of an exemplary embodiment of an alternate heat shielding element1010, according to the present disclosure. As illustrated inFIG. 51, the heat shielding element1010extends from a first end1012to a muzzle end or second end1015includes and one or more entry apertures1065, formed proximate the first end1012.

The heat shielding element1010provided in a series of different lengths and configurations and may be attached or coupled to operate as a stand-alone heatshield to shield an operator's hands from at least a portion of the barrel.

The heat shielding element1010limits radiated heat transfer from the barrel and reduces the firearms thermal signature as viewed through FLIR (forward looking infrared) or other heat sensitive cameras.

Additionally, the one or more entry apertures1065allow air to move in and through the center of the heat shielding element1010like a chimney, stack, or flue, as further described herein with reference to alternate embodiments of the heat shielding element of the present disclosure.

FIG. 52illustrates a partial cutaway front perspective view of an exemplary embodiment of a heat shielding and thermal venting system1200, according to the present disclosure. As illustrated inFIG. 52, the heat shielding and thermal venting system1200comprises at least some of a heat shielding element1210extending from a first end1212(not shown) to a muzzle end or second end1215(not shown), a flare portion1216(not shown), a primary portion1217, a secondary portion1219(not shown), and one or more entry apertures1230. Additionally, the heat shielding element1210may optionally include one or more restricted portions1218(not shown) and/or an extended flare portion1240(not shown).

It should be understood that each of these elements corresponds to and operates similarly to the correspondingly named elements, as described herein.

However, as illustrated inFIG. 52, an exemplary radially finned heat sink1280is included, which surrounds the barrel50to enhance cooling and heat radiation to air passing within the cavity of the heat shielding element1210. As illustrated, the radially finned heat sink1280includes a series of fins that extend radially and surround the barrel50.

In various exemplary embodiments, the radially finned heat sink1280is maintained in position by engagement with the exterior of the barrel50and do not connect or contact the heat shielding element1210. Thus, the barrel50is still free-floating within the heat shielding element1210.

FIG. 53illustrates a partial cutaway front perspective view of an exemplary embodiment of a heat shielding and thermal venting system1300, according to the present disclosure. As illustrated inFIG. 53, the heat shielding and thermal venting system1300comprises at least some of a suppressor heat shielding element1410extending from a first end1312(not shown) to a muzzle end or second end1315, a flare portion1316, a primary portion1317, a secondary portion1319, and one or more entry apertures1330(not shown). Additionally, the suppressor heat shielding element1410may optionally include one or more restricted portions1318.

It should be understood that each of these elements corresponds to and operates similarly to the correspondingly named elements, as described herein.

However, as illustrated inFIG. 53, the flare portion1316extends to form an extended flare portion1340that encloses the sides and a portion of the front of an attached suppressor58. By enclosing the sides and a portion of the front (leaving open an exit aperture) of the attached suppressor58, the thermal signature of the attached suppressor58is reduced and/or eliminated.

In certain exemplary embodiments, one or more apertures1335are formed in an area between the secondary portion1319and the extended flare portion1340. Alternatively, the extended flare portion1340may comprise any suppressor that comprises a separate component from the suppressor heat shielding element1410.

Since the extended flare portion1340encases most of the suppressor58and the second end1315forms a reduced exit aperture, the exit aperture constitutes a Venturi constriction or restricted portion1318, which can act to cause ambient air to be sucked into the one or more entry apertures1330and/or any apertures1335when the firearm is fired. An additional Venturi effect is created as air is drawn over the suppressor58and into the blast stream as the firearm is fired.

FIGS. 54-60illustrate an exemplary embodiment of a heat shielding and thermal venting system1400, according to the present disclosure. As illustrated inFIGS. 54-60, the heat shielding and thermal venting system1400is designed so as to operate in conjunction with a heat shielding element410or a heat shielding element710, as shown and described herein.

The heat shielding and thermal venting system1400is also designed so as to utilize a nozzle element500″. The nozzle element500″ is formed and operates similarly to the nozzle element500or the nozzle element500′. As illustrated, the nozzle element500″ comprises a substantially tubular nozzle body510″, which extends from a first end512″ to a second end515″. A flare portion516″ extends from the second end515″. While not illustrated, a nozzle attachment protrusion518″ (not shown), having a nozzle attachment aperture519″ may optionally be formed in or extend from at least a portion of the nozzle body510″.

An inner diameter of at least a portion of the first end512″ of the nozzle body510″ is formed so as to be attached or coupled to the second end415(or715) of the heat shielding element410(or710). The nozzle element500″ is attached or coupled to at least a portion of the second end415(or715) of the heat shielding element410(or710), as described herein with respect to the nozzle element500.

As further illustrated, the flare portion516″ extends to form an extended flare portion that is formed so as to be attached or coupled to a collar1420. The collar1420is formed so as to provide a transition between the flare portion516″ and a suppressor mount1430. In these exemplary embodiments, the collar1420is able to provide a substantially airtight seal between the flare portion516″ and the suppressor mount1430.

In various exemplary embodiments, the suppressor mount1430(and attached or coupled suppressor heat shielding element1410) can be attached, coupled, or connected to the flare portion516″ by the use of a flexible material tube section, or collar1420. If included, the collar1420may be formed of a heat resistant material and or silicone impregnation to retain heat and reduce signature. In this manner, a flexible flue or chimney is formed without affecting the freefloat nature of the barrel and suppressor assembly in relation to the suppressor heat shielding element1410and the accompanying heat shielding.

The collar1420may be of variable length and may be reinforced with wire spiral or mesh layer.

In certain exemplary embodiments, the flare portion516″ is formed so as to be attached or coupled to the suppressor mount1430, without the inclusion of the collar1420. Thus, in the suppressor related heat shielding and thermal venting system1400, the suppressor mount1430is configured on the end of the rifle barrel50that is retained by the suppressor58or a related muzzle device through, for example, a threaded section or a push ‘friction’ fit.

The suppressor mount1430includes a mounting aperture1432that allows at least a portion of a threaded barrel extension (or other muzzle device, such as, for example, a suppressor attachment device) to pass therethrough. In this manner, a suppressor58may be attached, coupled, or mounted to the barrel50. In certain alternative embodiments, the mounting aperture1432comprises an internally threaded mounting aperture1432, which allows the suppressor mount1430to be threaded late attached to the threaded barrel extension.

In still other embodiments, the mounting aperture1432may be formed so as to interact with a suppressor attachment device to couple, attach, or mount the suppressor mount1430to the barrel50.

The suppressor mount1430is formed so as to be attached or coupled to a suppressor heat shielding element1410. The suppressor heat shielding element1410extends from a first end1412to a muzzle end or second end1415. The second end1415generally forms a cap having an exit aperture1417. The suppressor heat shielding element1410and the second end1415define an internal cavity1418within the suppressor heat shielding element1410. The first end1412is typically open and the internal cavity1418is formed such that a suppressor58can be fully or at least partially contained within the internal cavity1418of the suppressor heat shielding element1410.

A plurality of internal supports1419extend from the internal side walls of the suppressor heat shielding element1410at spaced apart locations. The internal supports1419extend or protrude into the internal cavity1418. The internal supports1419form the support for the suppressor heat shielding element1410that is positioned over the suppressor58to form an air gap between the suppressor surface and the inside surface of the internal cavity1418of the suppressor heat shielding element1410. The suppressor heat shielding element1410is also formed to cover the front of the suppressor58and protrude slightly forward the muzzle area of the suppressor58. The suppressor heat shielding element1410is fixed to the suppressor mount1430.

The suppressor heat shielding element1410also features internal supports1419with gaps that rest against the suppressor58at the front so that the entire assembly is secure to the suppressor58itself. The rear of the suppressor heat shielding element1410is open to allow air to be drawn in.

When an attached suppressor58is positioned within the internal cavity1418and the suppressor heat shielding element1410is attached or coupled to the suppressor mount1430, the collar1420, and the flare portion516″, the rear, sides, and a portion of the front of the suppressor58are contained within the heat shielding and thermal venting system1400(leaving open the exit aperture1417, which is aligned with the exit aperture of the suppressor58), the thermal signature of the attached suppressor58is reduced and/or eliminated.

One or more apertures1435are formed in the suppressor mount1430. In this manner, the blast or exhaust gases that are created during a firing cycle are able to flow through the heat shielding element410(or710), the nozzle element500″, the one or more apertures1435, the air gap between the exterior of the suppressor58and the internal cavity1418(as provided by the internal supports1419), and through the exit aperture1417.

Because the suppressor heat shielding element1410encases most, if not all, of the suppressor58and the second end1415forms a reduced exit aperture1417, the exit aperture1417constitutes a Venturi constriction or restricted portion, which can act to cause ambient air to be sucked into the one or more entry apertures430and/or the one or more apertures1435when the firearm is fired. An additional Venturi effect is created as air is drawn over the suppressor58and into the blast stream as the firearm is fired.

As the firearm is fired and a round exits the suppressor58, blast or exhaust gas exits the muzzle and flows across the opening formed by the suppressor heat shielding element1410and protrusion area. Through the Bernoulli Effect, air is drawn from the gap and into the blast gas. This system causes cool air to be drawn into the rear of the suppressor heat shielding element1410from the heat shielding element410(or710), across the surface of the suppressor58and out the exit aperture1417, each time the gun is fired. It also allows a chimney or stack effect when raised or lowered. Additionally if the firearm is elevated a stack or chimney effect is induced causing air to move through the entire system.

FIGS. 61-62illustrate an exemplary embodiment of a heat shielding and thermal venting system1500, according to the present disclosure. As illustrated inFIGS. 61-62, the heat shielding and thermal venting system1500is designed so as to operate with or without a heat shielding element410or heat shielding element710. As illustrated, the heat shielding of thermal venting system1500includes a suppressor heat shielding element1510. The suppressor heat shielding element1510includes elements similar to those of the suppressor heat shielding element1410.

However, in certain exemplary embodiments, the suppressor heat shielding element1510optionally includes an extension portion1528that extends from the first end1512. The extension portion1528, if included, is formed so as to extend toward, and optionally at least partially around a portion of the handguard160.

The suppressor heat shielding element1510provides a cover or ‘sock’ that is able to cover all or at least a portion of a suppressor.

The heat shielding and thermal venting system1500further comprises a strap element1570that is attached or coupled to an outer surface of the suppressor heat shielding element1510and extends rearward so that the strap element1570may be attached or coupled to the handguard160. In various exemplary embodiments, the strap element1570is attached or coupled to the handguard160via interaction of bolts or screws1590, apertures1575formed in the strap element1570, and apertures formed in the handguard160.

The strap elements1570may also be used to retain the suppressor heat shielding element1510in place relative to the handguard160. The strap elements1570attach to the handguard160, while retaining the suppressor heat shielding element1510in place at the front.

In certain exemplary embodiments, the strap elements1570provide attachment points along their respective lengths using a ‘molle’ or similar attachment system. Additionally, attachable rail portions1590may also be attached or coupled, via the bolts or screws1590.

While the present disclosure has been described in conjunction with the exemplary embodiments outlined above, the foregoing description of exemplary embodiments of the invention, as set forth above, are intended to be illustrative, not limiting and the fundamental invention should not be considered to be necessarily so constrained. It is evident that the invention is not limited to the particular variation set forth and many alternatives, adaptations modifications, and/or variations will be apparent to those skilled in the art.

It is to be understood that the phraseology of terminology employed herein is for the purpose of description and not of limitation. Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which the present disclosure belongs.

In addition, it is contemplated that any optional feature of the inventive variations described herein may be set forth and claimed independently, or in combination with any one or more of the features described herein.

Accordingly, the foregoing description of exemplary embodiments will reveal the general nature of the invention, such that others may, by applying current knowledge, change, vary, modify, and/or adapt these exemplary, non-limiting embodiments for various applications without departing from the spirit and scope of the invention and elements or methods similar or equivalent to those described herein can be used in practicing the present invention. Any and all such changes, variations, modifications, and/or adaptations should and are intended to be comprehended within the meaning and range of equivalents of the disclosed exemplary embodiments and may be substituted without departing from the true spirit and scope of the invention.

Also, it is noted that as used herein and in the appended claims, the singular forms “a”, “and”, “said”, and “the” include plural referents unless the context clearly dictates otherwise. Conversely, it is contemplated that the claims may be so-drafted to require singular elements or exclude any optional element indicated to be so here in the text or drawings. This statement is intended to serve as antecedent basis for use of such exclusive terminology as “solely”, “only”, and the like in connection with the recitation of claim elements or the use of a “negative” claim limitation(s).