The present disclosure relates to mounting assemblies for firearm accessories.
When a firearm is discharged, accessories mounted to the firearm are subject to large acceleration impulses due to recoil. Over time, this can cause the accessories to loosen, shift, and in some cases, fall off. Shifting and loosening is particularly problematic with precision accessories, such as optics and aiming devices. Accordingly, a need exists for a firearm accessory mounting assembly able to better resist recoil.
The present disclosure provides, in one aspect, a mounting assembly for coupling a firearm accessory to a firearm, the mounting assembly comprising: a mount including a first side coupled to the firearm accessory, a second side opposite the first side, an opening extending between the first and second sides, and a slit extending between the first and second sides and intersecting the opening, the slit dividing the mount into a first portion and a second portion, wherein the first portion and the second portion are on opposite sides of the slit; and a fastener extending through the opening, wherein the fastener is rotatable in a tightening direction to couple the mount to the firearm with the second side of the mount adjacent the firearm, and wherein the slit is configured to permit flexure of the first and second portions of the mount toward the firearm when the fastener is rotated in the tightening direction.
In one aspect, the invention further comprises a raised rib extending from the second side of the mount, the raised rib engageable with the firearm to define a gap between the firearm and the first and second portions of each mount, wherein the first and second portions are configured to flex into the gap when the fastener is rotated in the tightening direction. In one aspect of the invention, the firearm includes a rail with a plurality of elongated slots, and each fastener is insertable through a corresponding one of the plurality of elongated slots to couple the mount to the firearm. In one aspect of the invention, each of the elongated slots includes a first end and a second end opposite the first end, and each mount further includes a projection extending from the second side of the mount, the projection configured as a recoil lug engaging the first end or the second end of the corresponding elongated slot to inhibit movement of the firearm accessory. In one aspect of the invention, the slit is a first slit, and each mount further includes a second slit intersecting the opening. In one aspect of the invention, the first slit and the second slit are perpendicular to each other. In one aspect of the invention, the opening includes a tapered portion having a cross-sectional area that decreases in a direction from the first side toward the second side. In one aspect of the invention, the tapered portion includes a first region having a first slope and a second region having a second slope different than the first slope. In one aspect of the invention, the second slope is steeper than the first slope. In one aspect of the invention, the first region is closer to the first side of the mount, and the second region is closer to the second side of the mount.
The present disclosure provides, in another aspect, a method for coupling an accessory mount to a firearm, the method comprising: inserting a deflectable portion of the accessory mount and a fastener through a slot of the firearm, the fastener having a head and a rotational axis and extending through the accessory mount; tightening the fastener to deflect the deflectable portion with the head of the fastener transverse to the rotational axis; and after tightening the fastener, clamping with the head of the fastener the accessory mount against the firearm with a longitudinally-directed clamping force.
In one aspect of the invention, the inserting step includes abutting a rib of the accessory mount against the firearm to define a gap between the firearm and the deflectable portion, and tightening includes deflecting the deflectable portion into the gap. In one aspect of the invention, inserting includes extending the fastener through an opening in the accessory mount, the opening including a first region having a first slope and a second region having a second slope different than the first slope; tightening includes engaging the second region with the fastener head without engaging the first region; and clamping includes engaging the first region with the fastener head. In one aspect of the invention, inserting includes positioning a recoil lug of the accessory mount in the slot, the recoil lug including at least part of the deflectable portion.
Other features and aspects of the disclosure will become apparent by consideration of the following detailed description and accompanying drawings.
Before any embodiments of the disclosure are explained in detail, it is to be understood that the disclosure is not limited in its application to the details of construction and the arrangement of components set forth in the following description or illustrated in the following drawings. The disclosure is capable of other embodiments and of being practiced or of being carried out in various ways. Also, it is to be understood that the phraseology and terminology used herein is for the purpose of description and should not be regarded as limiting.
With reference to
In the illustrated embodiment, the mounting assembly 20 is compatible with the M-LOK (by Magpul) accessory mounting interface, which is described in U.S. Pat. No. 8,925,236 to Mayberry et al., the entire content of which is hereby incorporated by reference. As such, the rail 24 includes a plurality of elongated slots 28, each with first and second opposite ends 36, 40. The slots 28 define a generally constant width 44 between the first and second ends 36, 40. In other embodiments, the rail 24 may include slots 28 of other shapes and arrangements (e.g., defining a KEYMOD accessory mounting interface, or any other interface suitable for mounting accessories).
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The raised rib 84 is engageable with the rail 24 to define a relief or gap 112 (
In operation, an operator uses the firearm accessory mounting system 20 to couple the mount 22 to the rail 24 (and thus, the accessory 16 to the firearm 2). More broadly speaking, this may be characterized as a method for coupling the accessory mount 22 to the firearm 2 because the invention is not limited to a handguard or rail 24 as illustrated. The operator first extends the fasteners 48 through the openings 46 of the accessory mount 22 from the first side 23a with the head 56 received in the taped opening 46. The operator then threads the nuts 72 onto the free end of the fasteners 48. Then the operator aligns the flange portions 80 of the nuts 72 with the clongated slots 28 in the rail 24 (
Next, the operator moves the mount 22 toward the rail 24 to insert the nuts 72, projections 116, and fasteners 48 into and/or through one of the slots 28. It has been noted that the projections 116 may be referred to as deflectable portions, so this step may also be characterized as inserting a deflectable portion of the accessory mount 22 and a fastener 48 through a slot 28 of the firearm 2. This inserting step also includes abutting the ribs 84, 88 of the accessory mount 22 against the rail 24 or firearm 2 to define the gap 112 between the rail 24 or firearm 2 and the deflectable portions. As noted above, the projections 116 fit within the ends 36, 40 of the slots 28 in light contact or with a small degree of play.
The operator then rotates each fastener 48 (using a fastener driver such as a screwdriver or hex key in some embodiments) about its respective rotational axis 68 in a tightening direction 120. As the fastener 48 rotates in the tightening direction 120 with respect to the accessory mount 22, the fastener 48 advances along the rotational axis 68. In the first ninety degrees of rotation in the tightening direction 120, the nut 72 co-rotates with the fastener 48 to the locked position, which prevents the nut 72 from being withdrawn from the slot 28. Upon reaching the locked position, the nut 72 is prevented from further rotation by engagement of a locking surface (not shown) on the nut 72 with the rail 24 and/or the mount 22. Further rotation of the fastener 48 in the tightening direction 120 then draws the nut 72 toward the mount 22 and moves the head 56 deeper into the opening 46, thereby clamping the rail 24 between the flange portion 80 of each nut 72 and the bottom side 23b of the mount 22.
As each fastener 48 is initially tightened, the countersunk head 56 engages the periphery of the opening 46 in the second region 64 (
As the fastener 48 continues to be tightened (translating or advancing the fastener 48 into the mount 22 in the direction of arrow 122), the countersunk head 56 also comes into engagement with the periphery of the opening 46 in the first region 60. The relatively shallow slope α in the first region 60 allows the fastener 48 to develop a greater axial clamping force to secure the mount 22 to the rail 24 between the head 56 of the fastener 48 and the nut 72. The flexure of the mount 22 pushes the deflectable portions (i.e.., the sub-portions 104a, 104b, 108a, 108b and the projections 116) both outwardly and toward the rail 24, generally in the directions of arrows 124 and 128. This results in a more positive engagement of the slots 28 with the projections 116 to facilitate the recoil resistance or absorption function of the projections 116. To summarize, after the initial tightening portion the operator clamps, with the head 56 of the fastener 48, the centered accessory mount 22 against the firearm 2 with a longitudinally-directed clamping force.
In other embodiments, the projections 116 may be longer such that they extend fully through the slot 28 with a distal end of the projections 116 below the rail 24. In such other embodiments, the deformation of the sub-portions 104a, 104b, 108a, 108b may results in the projections 116 expanding not only into engagement with the ends 36, 40 of the slot 28, but also underneath the ends 36, 40. In such embodiments, the point P of engagement would be between the sides of the projections 116 (as opposed to the distal ends of the projections 116) and the underside of the rail 24 (i.e. the side of the rail 24 opposite the mount 22). In such embodiments, the projections 116 would both center the accessory mount 22 in the slot 28 and further resist forces parallel to the rotational axes 68 of the fasteners 48.
Although the disclosure has been described in detail with reference to certain preferred embodiments, variations and modifications exist within the scope and spirit of one or more independent aspects of the disclosure as described.
Various features of the invention are set forth in the following claims:
This application is a division of U.S. patent application Ser. No. 17/271,102, filed Feb. 24, 2021, which is a national phase of International Patent Application No. PCT/US2019/048145, filed Aug. 26, 2019, which claims priority to U.S. Provisional Patent Application No. 62/722,565, filed Aug. 24, 2018, the entire contents of all of which are incorporated herein by reference.
Number | Date | Country | |
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62722565 | Aug 2018 | US |
Number | Date | Country | |
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Parent | 17271102 | Feb 2021 | US |
Child | 18414017 | US |