Dry fire practice training device with bolt carrier group for rifles

Abstract

When a semi-automatic rifle is live fired, it is ready to be fired again. The shooter's hands remain in the firing position, and just the trigger finger and trigger are employed. But with dry fire practice, the shooter must cycle the rifle's bolt to reset the firing pin. The shooter must move one hand from the shooting position on the rifle, the rifle's long bolt is pulled back to reset the firing pin, the rifle repositioned, a new sight picture acquired, and then the next trigger press can be accomplished. This invention replaces the rifle's bolt carrier group and provides realistic muscle memory training by duplicating the action of the trigger, the feel and the sound of the release of the firing pin, and the resetting of the trigger for additional trigger activations. The invention does not interact with the rifle's firing pin.

Claims

1. A dry fire training device for a semi-automatic rifle that defines a bolt carrier group compartment that carries a bolt carrier group therein, and wherein the bolt carrier group, carried in the bolt carrier group compartment, moves reciprocally between a first position proximate a rifle stock, and a second position, proximate a rifle barrel and opposite the rifle stock, and the bolt carrier group operatively communicates with a trigger of the semi-automatic rifle, and the trigger of the semi-automatic rifle operatively communicates with a hammer which operatively communicates with a firing pin of the semi-automatic rifle, the dry fire training device comprising: a cylinder that forms a generally cylindrical housing, that is elongate and which has a first end portion, a second end portion, an upper section, a lower section and a mid-section and which defines a generally cylindrical bore between the first end portion and the second end portion, and the lower section of the cylindrical housing defines a partial circumferential cut-out that begins at the second end portion and extends toward the first end portion but does not communicate with the first end portion, and the upper section carries a protuberance proximate the second end portion and opposite the circumferential cut-out for alignment of the cylindrical housing in the bolt carrier group compartment; a plunger axially movably carried in the cylindrical bore of the cylindrical housing at the first end portion thereof, the plunger having a protuberance that extends axially outwardly from the plunger, and opposite the cylindrical bore, and the plunger further defines a diametrically extending through slot for a fulcrum pin that extends therethrough to movably secure the plunger at least partially within the cylindrical bore of the cylindrical housing, and at the first end portion thereof, and the plunger is biased away from the second end portion of cylindrical housing by a spring, so as to align and positionally maintain the cylinder within the rifle's bolt carrier group compartment; a lever that is elongate and the lever has a first end portion, a second end portion, a top surface and a bottom surface and the lever is pivotally interconnected to the cylindrical housing within the cut-out portion, and the lever is movable between a resting position and an activated position relative to the cylindrical housing by pivoting upon a fulcrum pin that pivotally interconnects the first end portion of the lever to the cylindrical housing within the circumferential cut-out, and an inclined ramp is carried on the top surface of the lever between the first end portion of the lever and the second end portion of the lever, and a raised cylindrical projection is carried on the top surface of the lever proximate the second end portion of the lever to engage with a spring that biases the lever toward the resting position, and a rectangular projection is carried on the top surface of the lever between the raised cylindrical projection and a proximate end portion of the inclined ramp, the rectangular projection defining a transversely aligned slotted hole therein; a detent reed carried on the inclined ramp of the lever, the detent reed formed of a resilient metal which emits an audible and tactile simulation that replicates a release and reset of the semi-automatic rifle firing pin when the lever is moved between the resting position and the activated position responsive to activation of the semi-automatic rifle trigger and return of the rifle trigger to an unfired position; a transfer block operatively communicating between the semi-automatic rifle trigger and the bottom surface of the lever proximate the second end portion of the lever, for transferring movement of the semi-automatic rifle's trigger to the lever and to cause the lever to pivot between the resting position and the activated position; and a hammer block releasably carried within the semi-automatic rifle and communicating with the hammer of the semi-automatic rifle so that the semi-automatic rifle trigger is movable without activating the hammer; and the dry fire training device is installed in the bolt carrier group compartment of the semi-automatic rifle and replaces the semi-automatic rifle's bolt carrier group for dry fire practice training.

2. The dry fire training device as claimed in claim 1 and further comprising: a transversely extending through hole defined in the cylindrical housing for carriage of a pin to interconnect movable components to the cylindrical housing.

3. The dry fire training device as claimed in claim 1 and wherein the inclined ramp carried on the top surface of the lever is comprised of two angled projections for mounting the detente reed.

4. The dry fire training device as claimed in claim 1 and further comprising: a machine set screw carried in a threaded hole defined in the upper section of the cylindrical housing, and the machine set screw provides a means of regulating when the detente reed activates to simulate a release and reset of the semi-automatic rifle's firing pin.

5. The dry fire training device as claimed in claim 1 and wherein the springs are coil compression springs, and one coil compression spring provides a downward force to return the lever to the resting position; and a second coil compression spring biases the axially movable plunger toward the first end portion of the cylinder to align the dry fire training device in the semi-automatic rifle's bolt carrier group compartment.

6. The dry fire training device as claimed in claim 1 and wherein the transfer block frictionally communicates with the semi-automatic rifle's trigger, and moves up and down responsive to movement of the semi-automatic rifle's trigger; and the transfer block communicates that movement to the bottom surface of the lever.

Description

BRIEF DESCRIPTION OF THE SEVERAL VIEWS OF THE DRAWINGS

(1) FIG. 1 illustrates an isometric view of a cylinder with various holes and cutaways.

(2) FIG. 1-A illustrates an end view of the cylinder showing a recessed plug with a cylindrical depression for one end of one of the coil springs.

(3) FIG. 2 illustrates an isometric view of a plunger.

(4) FIG. 2-A illustrates an end view of the plunger showing a cylindrical depression for one end of one of the coil springs.

(5) FIG. 3 illustrates a detente reed.

(6) FIG. 4 illustrates an isometric view of a coil spring.

(7) FIG. 5 illustrates an isometric view of a lever.

(8) FIG. 6 illustrates an isometric view of a hammer block.

(9) FIG. 7 illustrates an isometric view of a transfer block.

(10) FIG. 8 illustrates an isometric view of a set screw.

(11) FIG. 9 illustrates an isometric view of a hinge pin.

(12) FIG. 10 illustrates a middle sectional view of an assembly of the bolt carrier group in its resting position.

(13) FIG. 11 illustrates a middle sectional view of an assembly of the bolt carrier group in its activated position.

DETAILED DESCRIPTION OF THE INVENTION

(14) FIG. 1 illustrates an isometric view of the cylinder 1 with a lower section removed, three pairs of holes to mount other parts, an upper raised section for maintaining the position of the cylinder 1 in the rifle's BCG compartment with a mid section for mounting the regulating screw 8 for adjusting the detente reed 3.

(15) FIG. 1-A illustrates an end view of the cylinder 1 showing an internal plug with a cylindrical hole for one of the coil springs 4.

(16) FIG. 2 illustrates an isometric view of the plunger 2 with a through slot for one of the fulcrum pins 9 to pass through for limiting the back and forth motion of the plunger 2, and a smaller projection from one end which locates into the chamber of the rifle thus positioning the cylinder 1 in the rifle's BCG's compartment.

(17) FIG. 2-A illustrates the opposite end of the plunger 2 showing a cylindrical hole for locating one end of one of the coil springs 4.

(18) FIG. 3 illustrates the detente reed 3 that supplies the snap sound and the tactile feel of the simulated release of the rifle's firing pin.

(19) FIG. 4 illustrates one of the coil springs 4, one of which returns the lever 5 assembly to its resting position when the trigger is released, another for extending the plunger 2 for locating the device into the chamber of the rifle.

(20) FIG. 5 illustrates the lever 5 with a pair of holes for the lever 5 to swing on the fulcrum pin 9, a pair of inclined ramps for mounting the detente reed 3, a rectangular projection that houses a slotted hole to guide the lever 5 in its up and down motion and limited in its motion by the fulcrum pin 9, and a small raised cylindrical projection to retain one end of one of the coiled springs 4.

(21) FIG. 6 illustrates the hammer keeper 6 which prevents the trigger hammer from falling when the trigger is activated.

(22) FIG. 7 illustrates the transfer block 7 which transfers the up and down movement of the trigger to the lower side of the lever 5.

(23) FIG. 8 illustrates the set screw 8 that is used to regulate when in the movement of the lever 5 assembly that the detente reed 3 activates.

(24) FIG. 9 illustrates the fulcrum pin 9 that pins the various parts together and/or allows for the controlled movement of these parts.

(25) FIG. 10 illustrates a sectional drawing of the assembled bolt carrier group consisting of the cylinder 1 to house the various parts comprised of the spring loaded plunger 2 which locates the front end of the device in the rifle, the lever 5 which has the detente reed 3 secured to its top surface providing the tactile and audible simulation of the rifle's firing pin release and reset, a projection for one end of the coil springs 4 which returns the lever 5 to its resting position. The cylinder 1 also has the setscrew 8 which allows for the adjusting of the position when the detente reed 3 snaps, simulating the release and reset of the rifle's firing pin.

(26) FIG. 11 illustrates a sectional drawing of the assembled bolt carrier group in its activated position showing the lever 5 raised, the detente reed 3 bent and activated, and the transfer block 7 raised.