Patent Application
20230136053
The present invention relates to firearms, and more particularly to a firearm trigger assembly that has two stages to provide feedback to the shooter without adversely affecting the trigger's reset time by increasing trigger travel to reset.
Rifle triggers are available in single-stage and two-stage forms. Single-stage triggers feature an unchanging pull weight throughout the entire trigger motion until the rifle discharges. In contrast, two-stage triggers typically feature a lower pull weight during the first stage's range of motion that terminates in a “wall” at the end of the first stage. This significant change in pull weight signals the shooter that additional trigger movement will discharge the firearm.
AR-15 rifles typically come with a mil-spec, single-stage trigger. This has the disadvantage of having a high pull weight relative to many alternative single-stage triggers. AR-15 mil-spec triggers also require a substantial range of trigger motion to discharge the rifle because of the extended length of the sear point on the hammer. Replacement AR-15 rifle single-stage triggers provide a high degree of responsiveness and reset speed for a follow-on shot, but they lack the feedback and increased safety provided by a two-stage trigger. Conventional replacement AR-15 rifle two-stage triggers have the disadvantage of having a longer reset time for a follow-on shot compared to single-stage triggers. An additional disadvantage of conventional 2-stage triggers is the requirement to use the disconnector spring for the second stage, which forces opposing benefits: having a clear, distinct wall, or having a fast, crisp trigger reset. This requirement also affects the pull weight. Thus, there are a lot of undesirable compromises associated with a conventional 2-stage trigger.
Therefore, a need exists for a new and improved firearm trigger assembly that has two stages to provide feedback to the shooter without adversely affecting the trigger's reset time by increasing trigger travel to reset. In this regard, the various embodiments of the present invention substantially fulfill at least some of these needs. In this respect, the firearm trigger assembly according to the present invention substantially departs from the conventional concepts and designs of the prior art, and in doing so provides an apparatus primarily developed for the purpose of having two stages to provide feedback to the shooter without adversely affecting the trigger's reset time.
The present invention provides an improved firearm trigger assembly, and overcomes the above-mentioned disadvantages and drawbacks of the prior art. As such, the general purpose of the present invention, which will be described subsequently in greater detail, is to provide an improved firearm trigger assembly that has all the advantages of the prior art mentioned above.
To attain this, the preferred embodiment of the present invention essentially comprises a frame, a hammer pivotally connected to the frame, a trigger element pivotally connected to the frame and operable to selectively restrain and release the hammer in response to movement of the trigger element between a restraint position and a release position, a trigger lever movably connected to the trigger element and movable with respect to the trigger element between a first unactuated position and a second actuated position, the trigger element being configured to remain in the restraint position when the trigger lever is in the first unactuated position, in any of a range of positions intermediate the first unactuated position and the second actuated position, and when in the second actuated position with an application of force to the trigger lever below a selected force threshold, and the trigger lever being operable to move the trigger element to the release position in response to an application of force to the trigger lever greater than the selected force threshold. There are, of course, additional features of the invention that will be described hereinafter and which will form the subject matter of the claims attached.
There has thus been outlined, rather broadly, the more important features of the invention in order that the detailed description thereof that follows may be better understood and in order that the present contribution to the art may be better appreciated.
The same reference numerals refer to the same parts throughout the various figures.
An embodiment of the firearm trigger assembly of the present invention is shown and generally designated by the reference numeral 10.
In the current embodiment, the trigger lever 20 is biased to the first unactuated position, and the trigger element 18 has a lever portion 22 coextensive with the trigger lever. The lever portion of the trigger element extends adjacent to the trigger lever. The trigger lever has a free end 38 operable to contact a free end portion 36 of the lever portion of the trigger element to motivate the trigger element. Furthermore, the trigger element and trigger lever each have lever portions 22, 34 each having free ends 36, 38, and the free ends of each lever portion abut each other when the trigger lever is in the second actuated position.
A disconnector 24 is connected to the trigger lever 20. Both the trigger lever and the trigger element 18 pivot about a common axis 26. The free ends 36, 38 of both the trigger lever and the trigger element extend a common distance from the common axis. A hammer spring 28 is connected to the trigger lever to establish a first stage pull weight. A trigger element spring 30 biases the trigger element with respect to the frame 14 to establish the selected force threshold. The majority of threshold force comes from sear friction and pushing the hammer 16 out of the way, but any adjustability is from the trigger element spring, which is a small spring positioned underneath the trigger element. The trigger lever is biased by a second spring (the hammer spring) other than the trigger element spring. Thus, a first spring (the trigger element spring) intervenes between the trigger element and the frame, and a second spring (the hammer spring) intervenes between the hammer and the trigger lever.
The firearm trigger assembly 10 is assembled into a single unit that can be readily installed into a host rifle 12 for easy assembly. The two-stage trigger functionality is divided into two separate movements to fully release the hammer 16 and fire the rifle. The trigger element 18 and trigger lever 20 operate independently of each other. Therefore, the first stage and second stage trigger movements are separate moving parts. The trigger lever is partially received by the trigger element in varying amounts as the trigger lever's position moves between the first unactuated position and the second actuated position.
To assemble the firearm trigger assembly 10, a disconnector spring 40 is inserted into a spring hole 42 in the trigger lever 20 to bias the disconnector forward. The disconnector 24 is then slid onto the trigger lever, and a disconnector pin 44 secures the disconnector in place. The trigger lever is then interlocked into the trigger element 18 by rotating, sliding them together, rotating the opposite direction, and finally sliding the trigger element upwards to align the bushing holes 46, 48. The trigger element includes a ring-shaped feature 50 that is raised above the main surface 52 by a small amount. The ring-shaped feature minimizes surface friction between the trigger lever and the trigger element, which allows for more force control during assembly and in use for shooting. An additional ring-shaped feature is present on the opposed side of the trigger element to minimize surface friction when interacting with a safety catch 54.
Subsequently, a trigger link 56 (shown in
The safety catch 54 has an aperture 68 that aligns with the bushing holes 46, 48 of the trigger element 18 and trigger lever 20. The alignment is maintained by a bushing 70 that will be installed later, which allows for rotation about the bushing. The rear 72 of the safety catch sits on a portion 74 of the disconnector pin 44. When the trigger lever is pulled, the front 76 of the safety catch rotates downward. The safety catch serves as a drop safety and prevents any inadvertent striking of the firing pin if the hammer 16 were to ever disengage from the trigger sear 78 on the trigger element unintentionally. The safety catch stops the hammer in a position where, even if the hammer were to be released from that position, the hammer lacks sufficient energy to discharge the rifle 14. The safety catch ensures the trigger lever and trigger element must be intentionally pulled for the rifle to fire.
The components that have been assembled thus far into a subassembly are subsequently placed in the frame 14. A bushing 80 will be inserted into the bushing holes 82, 84 defined by the frame to hold the subassembly in place. Compression springs 32 are then installed into the bottom 86 of the frame. The compression springs make installation of the firearm trigger assembly 10 in the rifle 14 easy, consistent, and secure. The compression springs place upward tension on the bottom rear of the frame, which applies consistent force to the bushings and the trigger pins in the receiver of the rifle. The hammer 16 and hammer spring 28 are then installed in the frame. The hammer spring provides force for the hammer, the safety catch 54, and the trigger lever 20. A full-length spring leg 86 of the hammer spring rests on the safety catch, which keeps the rear 72 safety catch firmly pressed into the portion 74 of the disconnector pin 44. The full-length spring leg also provides most of the pull weight of the trigger lever 20. A shorter length spring leg 88 rests on the trigger link 56 and contributes minimally to the pull weight of the trigger lever because the shorter length spring leg terminates so close to the common axis 26. Finally, the bushings 70, 80 are installed by inserting them in the various bushing holes in the components and frame.
It should be appreciated that the trigger link 56 is critical to the proper function of the firearm trigger assembly 10. The trigger link is mounted on the trigger lever 20 using two locating bosses on the trigger link and a corresponding slot and hole on the trigger lever and is secured by the socket cap screw 58. Once the trigger link is rigidly mounted on the trigger lever, an extended ledge 90 on the trigger link interfaces with a shelf 92 on the trigger element 18 and prohibits the trigger element from moving without the trigger lever (and by connection the trigger link) moving first. Therefore, with the safety catch 54 on safe, a back safety flat 94 on the trigger lever will not be able to move up, so neither the trigger lever nor the trigger element can be pulled without first disengaging the safety catch. Once the safety catch is off, the trigger lever can be pulled and will move the ledge on the trigger link completely out of the way of the shelf on the trigger element, allowing the trigger sear 78 to move downward and release the hammer 16.
In the context of the specification, the terms “rear” and “rearward,” and “front” and “forward,” have the following definitions: “rear” or “rearward” means in the direction away from the muzzle of the firearm while “front” or “forward” means it is in the direction towards the muzzle of the firearm.
While a current embodiment of a firearm trigger assembly has been described in detail, it should be apparent that modifications and variations thereto are possible, all of which fall within the true spirit and scope of the invention. Although rifles have been disclosed, the firearm trigger assembly is also suitable for use with any other firearm type where a two-stage trigger would be beneficial. With respect to the above description then, it is to be realized that the optimum dimensional relationships for the parts of the invention, to include variations in size, materials, shape, form, function and manner of operation, assembly and use, are deemed readily apparent and obvious to one skilled in the art, and all equivalent relationships to those illustrated in the drawings and described in the specification are intended to be encompassed by the present invention.
Therefore, the foregoing is considered as illustrative only of the principles of the invention. Further, since numerous modifications and changes will readily occur to those skilled in the art, it is not desired to limit the invention to the exact construction and operation shown and described, and accordingly, all suitable modifications and equivalents may be resorted to, falling within the scope of the invention.
This application claims the benefit of U.S. Provisional Patent Application No. 63/263,165 filed on Oct. 28, 2021, entitled “2-STAGE RIFLE TRIGGER ASSEMBLY,” which is hereby incorporated by reference in its entirety for all that is taught and disclosed therein.
| Number | Date | Country | |
|---|---|---|---|
| 63263165 | Oct 2021 | US |
