The invention relates generally to buttstocks for attachment to firearms, and more particularly to a buttstock assembly that has an improved slide lock mechanism which provides an anti-rattle assembly.
For several military applications and/or operational groups, weapons may need to be collapsible for ease of transportation to a field venue, and then easily assembled in the field. For example, rifles are frequently designed to be collapsible. One typical portion of a collapsible rifle assembly is the buttstock that forms the aft-most part of the assembled rifle, which is received and covers a recoil absorption appendage, or “receiver extension.” In general, modern conventional buttstocks are ergonomic since the buttstock forms the interface with the user's shoulder area, and adjustable along the receiver extension to further form fit the rifle to the user. One manner in which modern conventional buttstocks are made adjustable is via a slide lock mechanism, which provides a biasing pin that fits into a retaining feature, such as a pin seat or hole, provided along the receiver extension. A number of such pin seats or holes are so provided by the receiver extension to provide multiple adjustment points which are used to either lengthen or shorten the rifle as a user may desire.
In one embodiment, an apparatus for an anti-rattle assembly for a collapsible buttstock for a firearm may include a baseplate with a plurality of lower guides and a plurality of fasteners wherein the plurality of fasteners removably secure the anti-rattle assembly to a plurality of fastener positions of a buttstock body. The anti-rattle assembly may further include a pressure plate with one or more ridges to engage one or more rail surfaces of a receiver extension and a plurality of upper guides and a plurality of biasing members wherein the pressure plate is vertically aligned with the baseplate and the plurality of biasing members are coupled between the upper guides and the lower guides and bias the one or more ridges against the one or more rail surfaces. The anti-rattle assembly restricts the movement of the receiver extension in a tubular aperture of the buttstock body.
In another embodiment, an apparatus for a collapsible buttstock assembly may include a receiver extension, a buttstock body, and an anti-rattle assembly. The receiver extension may include an outer an alignment rail extending longitudinally along the receiver extension and comprising an elongated slot with a plurality of cavities spaced apart at regular intervals and one or more rail surfaces spanning a length of the alignment rail wherein each rail surface is situated on either side of the plurality of cavities. The buttstock body may include a body axis that runs longitudinally from a first end to a second end, and a tubular aperture with a tubular axis and a groove parallel with the tubular axis and is situated along an outer tube wall of the tubular aperture, the tubular axis is parallel to the body axis, and wherein the tubular axis receives the receiver extension. The buttstock body may further include a locking pin situated in a pin aperture with a pin axis that orthogonally penetrates the groove and wherein the locking pin in the extended position engages a cavity of the plurality of cavities and restricts the movement of the receiver extension, and a pin biasing spring that biases the locking pin into the groove. The buttstock body may further include a lever coupled to the locking pin wherein when the lever is actuated in a first direction, the locking pin is in retracted position and when the lever is in a resting state, the locking pin is in an extended position, and a plurality of fastener positions located around a perimeter wall of a rattle aperture.
In yet another embodiment, a method for reducing movement in a collapsible buttstock may include applying pressure on a receiver extension inserted into a tubular aperture of a buttstock body by using the anti-rattle kit. The method of reducing movement may further include aligning an upper tube portion of the receiver extension with an upper body portion of the tubular aperture with the applied pressure to reduce the movement of the buttstock body in relation to the receiver extension, and maintaining the alignment a tubular axis of the buttstock body with a firearm axis. The anti-rattle kit may include a baseplate with a plurality of lower guides and a plurality of fasteners wherein the plurality of fasteners removably secure the anti-rattle assembly to a plurality of fastener positions of the buttstock body, a pressure plate with one or more ridges to engage one or more rail surfaces of the receiver extension and a plurality of upper guides, and a plurality of biasing members wherein the pressure plate is vertically aligned with the baseplate and the plurality of biasing members are coupled between the upper guides and the lower guides and bias the one or more ridges against the one or more rail surfaces.
These and other features, aspects, and advantages of the present invention will become better understood with reference to the following description and the appended claims.
The embodiments set forth in the drawings are illustrative and exemplary in nature and not intended to limit the subject matter defined by the claims. The following detailed description of the illustrative embodiments can be understood when read in conjunction with the following drawings, where like structure is indicated with like reference numerals and in which:
An anti-rattle assembly may be used in any type of collapsible firearm stock to reduce the play between a receiver extension of the firearm and a buttstock assembly that is slideably coupled to the receiver extension. The anti-rattle assembly may be mounted to the buttstock assembly and apply pressure to the receiver extension to reduce and/or eliminate any freedom of movement between the receiver extension and the buttstock assembly. The reduction and/or elimination of movement between the receiver extension and the buttstock assembly will reduce and/or eliminate noise from contact between the receiver extension and the buttstock assembly when the firearm is not under tension (e.g. not shouldered and/or in preparation to fire the firearm). In other words, when the firearm is being carried and/or moved, a noise or a rattle may emanate from contact between the receiver extension and buttstock assembly. In the field, such unwanted noise can be to a user's disadvantage by disclosing presence and/or position of the user to an adversary. Alternatively, when the firearm is under tension, (e.g. the firearm is shouldered) the freedom of movement between the receiver extension and buttstock assembly may affect a proper sight picture with a target. In other words, the gaps or space between the receiver extension and the buttstock may allow for the collapsible firearm stock to bend and/or deflect at an interface between the receiver extension and the buttstock assembly thereby allowing for an improper alignment of a user's line of sight with the sights on the firearm for a proper sight picture. As such, it is to be understood that the particular embodiment shown and described herein is merely one example of a suitable firearm and buttstock assembly, and that a firearm and/or buttstock assembly of any other type, kind, configuration, construction and/or arrangement in accordance with the subject matter of the present disclosure could alternately be used.
Referring now to
As stated above, the receiver extension 115 may be configured for any length L. With the variation in the length L, the number of the plurality of cavities 215 may also be varied based on the application of the collapsible buttstock 105 (
The receiver extension 115 may be used to house a recoil assembly (not shown) to allow for operation of the firearm 100. The recoil assembly may include an action spring (not shown) and a buffer assembly (not shown). The receiver extension 115 may be coupled to a firearm body 225 by welding, adhesives, twist lock, or a nut and bolt. In one embodiment, the receiver extension 115 may include a threaded body at one end of the outer surface 205 and the firearm body 225 may include a nut assembly. The threaded body of the receiver extension 115 may threadably couple with the nut assembly of the firearm body 225 and restrict the receiver extension 115 from rotating in relation to the firearm body 225. In another embodiment, the receiver extension 115 may also be a buttstock mount (not shown) that does not serve to house the recoil assembly. The buttstock mount may be coupled to the firearm body 225 and may allow the buttstock assembly 110 to be slideably couple with the firearm 100. The buttstock mount may mimic the features of the receiver extension 115 as shown in
A pressure plate 340 may be situated vertically above the baseplate 305 as depicted by
If the alignment rail 200 has the intermediate rail surfaces as described above, the one or more ridges 345a, 345b of the pressure plate 340 may include an intermediate ridge to contact and apply a biasing force or pressure to the receiver extension 115. The intermediate ridge may span the distance between the one or more ridges 345a, 345b to contact the intermediate rail surfaces or the intermediate ridge may be a solid surface running the length of the one or more ridges. If the intermediate ridge is solid, a second plate aperture may be present and aligns with the plate aperture 315 of the base plate to allow the locking pin 405 to slideably couple with the pressure plate 340.
A plurality of fastener apertures 360 may be included in the pressure plate 340 to allow for the movement of the pressure plate 340 along the vertical axis V without interference from the plurality of fasteners 320 being coupled to the buttstock body 400. Referring to
The pressure plate 340 may also include one or more lower stops 370. The buttstock body 400 may include one or more upper stops 500 of
The locking pin 405 may be operable to removably secure the receiver extension 115 in relation to the buttstock body 400. The locking pin 405 may include a pin axis P that is orthogonal to the tubular axis T as depicted in
A lever 450 may be hingedly coupled to the locking pin 405 and may provide a lever force to retract the locking pin 405 from the cavity of the one or more cavities 215. A retracted position is defined when the lever 450 retracts the locking pin 405 from the cavity of the plurality of cavities 215. The retracted position allows the collapsible buttstock 105 to either be moved to another telescoping position or to allow the receiver extension 115 to be removed from the tubular aperture 420 of the collapsible buttstock 105. The pin biasing spring 410 biasing force may provide enough tension between the locking pin 405 and the lever 450 to ensure that the lever 450 does not move or slide when in a resting position. The pin biasing spring 410 also provides enough biasing force for the locking pin 405 to maintain the extended position. The resting position of the lever 450 may be when the locking pin 405 is in the extended position as it does not require any actuation to maintain the extended position. When the lever 450 is actuated in a first direction D (i.e. when a force is placed on the lever 450 in the first direction D as depicted by
In another embodiment, a retaining ring 455 may be coupled to the locking pin 405 to capture and secure the lever 450. In the illustrated embodiment, the lever 450 may be slideably coupled to the locking pin 405. The retaining ring 455 may be threaded onto the locking pin 405 to secure and couple the retaining ring 455 to the locking pin 405. In other embodiments, any suitable means for coupling the lever 450 to locking pin 405, such as gluing, welding, etc., may be used.
The plurality of fastener positions 460 (
When the receiver extension 115 is inserted into the tubular aperture 420, the pressure plate 340 may be directed downward along the vertical axis V (
In another embodiment, the lever 450 may include features of the baseplate 305 to include the plurality of lower guides 310 and the plurality of fasteners to removably secure the anti-rattle assembly to the plurality of fastener positions within the rattle aperture of the buttstock body 400. In other words, the baseplate 305 is integral with the lever 450. The plate aperture 315 of the baseplate 305 may be disposed on the lever 450. The second plate aperture (not shown) of the pressure plate 340 may align with the plate aperture 315 of the lever 450 to define a through bore. It is to be appreciated that placing the locking pin 405 in the retracted position and/or the release position, lessens the biasing force applied by biasing members 325. In the retracted position, the lever 450 moved away from the buttstock body 400 and hence the pressure applied by the pressure plate 340 to the one or more rail surfaces 220a, 220b through the one or more ridges 345a, 345b, may be reduced as the biasing members 325 extend and/or relax. In other words, this lessening of the biasing force, and hence contact pressure, results from applying a force to the lever 450 in the first direction D, which creates spacing that likewise permits plurality of lower guides 310 to move away relatively from the pressure plate 340 via expansion of the biasing members 325a, 325b, basically simultaneously, when the locking pin 405 is place in the retracted position. This reduction of the pressure applied by the pressure plate 340 to the one or more rail surfaces 220a, 220b, is such that the pressure plate 340 will not hinder the movement of the collapsible buttstock 105 along the receiver extension 115 Likewise, when the locking pin 405 is in the extended position, i.e., normal resting position, the lever 450 closes the spacing between the plurality of lower guides 310 and the pressure plate 340, via pin biasing spring 410 providing a biasing force on the locking pin 405 in the upward direction and which results in the locking pin 405 and the pressure plate 340 engaging in at least two different places and at least under two different biasing forces, via biasing members 410, 325, the receiver extension 115 as is depicted by
It is noted that the terms “substantially” and “about” may be utilized herein to represent the inherent degree of uncertainty that may be attributed to any quantitative comparison, value, measurement, or other representation. These terms are also utilized herein to represent the degree by which a quantitative representation may vary from a stated reference without resulting in a change in the basic function of the subject matter at issue.
Certain terminology is used in the disclosure for convenience only and is not limiting. The words “left”, “right”, “front”, “back”, “top”, “bottom”, “upper”, and “lower”, “vertical”, and “horizontal” designate directions in the drawings to which reference is made. The terminology includes the words noted above as well as derivatives thereof and words of similar import.
While particular embodiments have been illustrated and described herein, it should be understood that various other changes and modifications may be made without departing from the spirit and scope of the claimed subject matter. Moreover, although various aspects of the claimed subject matter have been described herein, such aspects need not be utilized in combination. It is therefore intended that the appended claims cover all such changes and modifications that are within the scope of the claimed subject matter.