BUFFER RETAINER

Abstract

Buffer retainer, which buffer retainer comprises a body portion having an upper surface, and a retainer tab extending from the upper surface of the body portion, wherein the cross-sectional area of the retainer tab is smaller than the cross-sectional area of the body portion, wherein the body portion is configured to be set in a hole formed in a frame piece of a weapon, and wherein the retainer tab is configured to extend above surface of the frame piece via a channel to restrict movement of a buffer of the weapon, which channel extends between the end surface of the hole and the said surface of the frame piece, and which channel has smaller diameter than the said hole. The invention also relates to a buffer retainer system utilizing such a buffer retainer

Claims

1. A buffer retainer, which buffer retainer comprises a body portion having an upper surface, and a retainer tab extending from the upper surface of the body portion, wherein a cross-sectional area of the retainer tab is smaller than a cross-sectional area of the body portion, and wherein the body portion is configured to be set in a hole formed in a frame piece of a weapon, wherein the retainer tab is configured to extend above surface of the frame piece via a channel to restrict movement of a buffer of the weapon, which channel extends between an end surface of the hole and the surface of the frame piece, and which channel has smaller diameter than the hole.

2. The buffer retainer according to claim 1, wherein a longitudinal center axis of the body portion and a longitudinal center axis of the retainer tab are parallel but not concentric.

3. The buffer retainer according to claim 1, wherein the body portion comprises a recess on a bottom surface of the body portion configured to receive end of a spring.

4. The buffer retainer according to claim 1, wherein the retainer tab comprises a bevel on an area configured to extend from a surface of a frame piece of a weapon, which bevel is located on a side configured to be opposite from a side configured to be set against the buffer.

5. A buffer retainer system, which system comprises a buffer retainer and a retainer spring set in a hole formed in a frame piece of a weapon, and wherein the buffer retainer comprises a retainer tab configured to extend above a surface of the frame piece to restrict movement of a buffer of the weapon, wherein the buffer retainer is a buffer retainer of claim 1, and the frame piece comprises a channel extending between an end surface of a hole and the surface of the frame piece, and which channel has smaller diameter than the hole.

6. The buffer retainer system according to claim 5, wherein the system comprises a retainer screw for keeping the spring and the buffer retainer inside the said hole.

7. The buffer retainer system according to claim 5, wherein the longitudinal center axis of the said hole and the channel are parallel but not concentric.

8. The buffer retainer system according to claim 5, wherein the said hole and the channel extend substantially perpendicularly in relation to the said surface of the frame piece (4) of the weapon (1).

9. The buffer retainer system according to claim 5, wherein the opening of the channel on the surface of the frame piece is in immediate vicinity of a threaded fixing surface formed in the frame piece for a buffer tube.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Exemplifying embodiment of the invention and its advantages are explained in greater detail below in the sense of example and with reference to accompanying drawings, where

[0020] FIG. 1 shows schematically an embodiment of a weapon in which the present invention can be utilized,

[0021] FIG. 2 shows schematically an embodiment of a buffer retainer of the invention,

[0022] FIG. 3 shows schematically the embodiment of FIG. 2 assembled at its place in a frame piece of a weapon,

[0023] FIG. 4 shows schematically a top view of the embodiment of FIG. 2 at its place,

[0024] FIGS. 5 and 6 show schematically cross-sectional views of the embodiment of FIG. 2 at its place,

[0025] FIG. 7 shows schematically an exploded view of an embodiment of a buffer retainer system of the invention, and

[0026] FIG. 8 shows schematically the area of the buffer retainer system of the invention when a pistol grip is connected at its place on the weapon.

DETAILED DESCRIPTION OF THE INVENTION

[0027] FIG. 1 shows schematically an embodiment of a weapon 1 in which a buffer retainer system of the invention can be utilized. The weapon 1 show is an automatic rifle. The main parts of the weapon 1 in the context of the present invention are the area of the pistol grip 2, buffer tube 3, and the frame piece 4 in which the pistol grip 2 and buffer tube 3 are connected, which frame piece is in this embodiment a lower receiver of an AR-type rifle.

[0028] FIG. 2 shows schematically an embodiment of a buffer retainer 5 of the invention. The buffer retainer 5 comprises a body portion 6, and a retainer tab 7 extending from the top surface of the body portion.

[0029] The body portion 6 of the buffer retainer 5 is preferably cylindrical in form, and the retainer tab 7 extending from the top surface of the body portion is located eccentrically on that surface. In other words, the longitudinal center axis of the body portion 6 and the retainer tab are parallel but not concentric. The eccentricity of the retainer tab 7 in relation to the body portion 6 also define the position of the buffer retainer 5 when in is assembled at its place in the frame piece 4 of the weapon 1.

[0030] In the upper end area of the retainer tab 7 is formed a bevel 8. When the buffer retainer 5 is assembled at its place in the frame piece 4 of the weapon 1, the bevel will be on the side of the buffer retainer closest to a bolt carrier of the weapon 1.

[0031] FIG. 3 shows schematically the buffer retainer 5 shown in FIG. 2 assembled at its place in a frame piece 4 of a weapon 1. When the buffer retainer 5 is at its place, only the upper part of the retainer tab 7 extends from the surface 4a of the frame piece 4, rest of the buffer retainer 5 is located inside the frame piece 4. This outwards from surface 4a extending part of the retainer tab 7 also comprises the bevel 8. The opposite side of the retainer tab 7 in relation to the bevel 8 keeps the spring-loaded buffer 9 inside the buffer tube 3.

[0032] FIG. 4 shows schematically a top view of the buffer retainer 5 at its place in the frame piece 4, as shown in FIG. 3. The straight surface at the right side of the buffer tab 7 sets against the buffer 9. The eccentric position of retainer tab 7 in the upper surface of the body portion 6 of the buffer retainer 5, together with the related hole and channel formed in the frame piece 4 in corresponding eccentric arrangement, the larger diameter hole for the body portion 6 and the smaller diameter channel for the retainer tab 7, keeps the buffer retainer at its position and prevents it from rotating in the channels during operation of the weapon 1.

[0033] FIGS. 5 and 6 show schematically cross-sectional views wherein the buffer retainer 5 is assembled at its place in the weapon.

[0034] FIG. 5 illustrates the situation where a bolt carrier 10 presses against the buffer 9 at its rearmost position due to firing of the weapon or due to manual loading movement of the weapon. In this position the bolt carrier 10 is moved inside the buffer tube 3 and passed the retainer tab 7 of the buffer retainer 5. In the bottom surface of the bolt carrier 10 is formed a continuous groove so that the bolt carrier can pass the retainer tab 7 without contacting it. After the bolt carrier 10 has reached its rearmost position, the buffer spring 11 will push the buffer 9 and the bolt carrier forward, which forward movement of the buffer is stopped with the retainer tab 7 as shown in FIG. 6.

[0035] FIGS. 5 and 6 also illustrate the hole and channel formed in frame piece 4 of the weapon for the buffer retainer 5. The larger diameter hole 14 is formed, preferably by drilling, via a surface of the frame piece 4 away from the buffer tube 3, and the hole ends a distance away from the plane of the fixing surface of the buffer tube. The hole 14 houses the body portion 6 of the buffer retainer 5, retainer spring 12, and a retainer screw 13 locking the body portion 6 and the retainer spring 12 inside the hole 14. As can be seen from the cross-sections shown in FIGS. 5 and 6, in the body portion 6 of the buffer retainer 5 is formed a recess at its bottom surface in which recess the first end of the retainer spring 12 is located.

[0036] The smaller diameter channel 15 is formed for the retainer tab 7, and the channel extends from the end surface of the hole 14 to the surface 4a of the frame piece 4 so, that its opening on the surface 4a is located very near the fixing thread for fixing the buffer tube 3 to the frame piece 4.

[0037] The hole 14 and the channel 15 are located in relation to each other in this embodiment so, that the side edges of the hole and channel that are the most away from the rear of the frame piece 4 coincide in a point, i.e. form a straight line extending longitudinally along the side surfaces of both the hole and the channel. In this way the channel 15 is completely on the area of the end surface of the hole 14, but at the edge of that area. The center lines of the hole 14 and channel 15 are parallel and preferably substantially perpendicular in relation to the surface 4a, but can alternately also be formed non-perpendicularly in relation to the surface 4a.

[0038] FIG. 7 shows schematically an exploded view of the parts of the buffer retainer system, i.e. the buffer retainer 5, retainer spring 12 and the retainer screw 13. When assembled inside the hole 14, the retainer spring 12 keeps the buffer retainer 5 at its place with its spring force, but allows manual pushing of the buffer retainer 5 down if the buffer 9 needs to be removed from the buffer tube 3. The retainer screw 13 has threaded outer surface which allows it to be screwed in the hole 14 via threading formed therein.

[0039] FIG. 8 shows schematically how the hole 14 is covered with a pistol grip 2 when the pistol grip is fixed on the frame piece 4. This prevents dirt penetrating and collecting in the area of the retainer screw 13 and the hole 14.

[0040] The specific exemplifying embodiment of the invention shown in figures and discussed above should not be construed as limiting. A person skilled in the art can amend and modify the embodiment described in many evident ways within the scope of the attached claims. Thus, the invention is not limited merely to the embodiment described above.