Dry Fire Practice Training Device with Bolt Carrier Group for Rifles

Abstract

When a semiautomatic rifle is live fired, it is ready to be fired again. The shooter's hands remain in the firing position, and just to the trigger finger and trigger are employed. But with dry fire practice, the shooter must cycle the rifles bolt to reset the firing pin. The shooter must move one hand from the shooting position on the rifle, the rifles along bolt is pulled back to reset the firing pin, the rifle is repositioned, a new site picture is acquired, and then the next trigger press can be accomplished. This invention replaces the rifles 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 rifles firing pin.

Claims

1. A method for dry fire training with a semi-automatic rifle comprising the steps: providing a semi-automatic rifle that defines a bolt carrier group compartment and which removably 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 of the semi-automatic rifle which operatively communicates with a firing pin of the semi-automatic rifle; removing the bolt carrier group of the semi-automatic rifle from the bolt carrier group compartment; providing 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 partial circumferential cut-out for alignment of the cylindrical housing in the bolt carrier group compartment; providing a plunger that is 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 fro 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 bolt carrier group compartment; providing an elongate lever that has a first end portion, a second end portion, a top surface and a bottom surface and the elongate lever is pivotally interconnected to the cylindrical housing within the partial circumferential cut-out portion, and the elongate 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 elongate lever to the cylindrical housing within the partial circumferential cut-out, and an inclined ramp is carried on the top surface of the elongate lever between the first end portion of the elongate lever and the second end portion of the elongate lever, and a raised cylindrical projection is carried on the top surface of the elongate lever proximate the second end portion of the elongate lever to engage with a spring that biases the elongate lever toward the resting position, and a rectangular projection is carried on the top surface of the elongate 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; providing a detent reed, and positionally securing the detent reed on the inclined ramp of the elongate lever, and the detent reed is 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 elongate lever is moved between the resting position and the activated position responsive to activation of the trigger of the semi-automatic rifle, and return of the trigger to an unfired position; providing a transfer block that operatively communicates between the trigger of the semi-automatic rifle and the bottom surface of the elongate lever proximate the second end portion of the elongate lever, for transferring movement of the semi-automatic rifles trigger to the elongate lever and to cause the elongate lever to pivot, relative to the generally cylindrical housing, between the resting position and the activated position; and providing a hammer block and positioning the hammer block within the semi-automatic rifle so that the hammer block communicates with the hammer of the semi-automatic rifle so that the trigger of the semi-automatic is movable without activating the hammer of the semi-automatic rifle; and installing the cylinder and its components within the bolt carrier group compartment defined in the semi-automatic rifle in place of the semi-automatic rifle's bolt carrier group.

2. The method for dry fire training with a semi-automatic rifle of claim 1 and further comprising the step: providing a transversely extending through hole defined in the generally cylindrical housing for carriage of a pin to interconnect movable components to the generally cylindrical housing.

3. The method for dry fire training with a semi-automatic rifle of 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 method for dry fire training with a semi-automatic rifle of claim 1 and further comprising the step: providing a set screw that is carried in a threaded hole defined in the upper section of the generally cylindrical housing, and the 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 method for dry fire training with a semi-automatic rifle of claim 1 and further comprising the step; providing a coil spring and positioning the coil spring on the raised cylindrical projection on the top surface of the elongate lever so that the coil spring operatively communicates with the generally cylindrical housing to provide a downward force to return the elongate lever to the resting position; and providing a second coil spring to bias the axially movable plunger toward the first end portion of the cylinder to positionally align the dry fire training device the semi-automatic rifle's bolt carrier group compartment.

6. The method for dry fire training with a semi-automatic rifle of claim 1 and wherein the transfer block frictionally communicates with the trigger of the se ii-automatic rifle, and the transfer block moves up and down responsive to movement of the trigger of the semi-automatic rifle; and the transfer block communicates the up and down movement to the bottom surface of the elongate lever.

7. A method of manufacturing a dry fire training device for a set i-automatic rifle that defines a bolt carrier group compartment which carries a removable 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 stock portion of the semi-automatic rifle, and a second position, proximate a barrel of the semi-automatic rifle and opposite the 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 firing pin of the semi-automatic rifle, the method comprising the steps: providing 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, defining a generally cylindrical bore in the generally cylindrical housing that extends between the first end portion and the second end portion, and defining a partial circumferential cut-out in the lower section of the generally cylindrical housing and the partial circumferential cut-out begins at the second end portion and extends toward the first end portion but does not communicate with the first end portion, and forming a protuberance on the upper section of the generally cylindrical housing proximate the second end portion and opposite the circumferential cut-out for alignment of the generally cylindrical housing in the bolt carrier group compartment; providing a coil spring and positioning the coil spring within the generally cylindrical bore of the generally cylindrical housing and proximate the first end portion thereof; providing a plunger and defining a diametrically extending through slot in the plunger, and positioning the plunger within the generally cylindrical bore and at the first end portion thereof so that the plunger is at least partially axially movable within the generally cylindrical bore, the plunger having a protuberance that extends axially outwardly from the plunger, and opposite the generally cylindrical bore; providing a fulcrum pin and positioning the fulcrum pin through a pair of aligned holes defined in the generally cylindrical housing proximate the first end portion thereof so that the fulcrum pin simultaneously extends through the diametrically extending through slot defined in the plunger 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 the coil spring, and the coil spring biasing of the plunger provides for positionally maintaining the cylinder within the rifle's bolt carrier group compartment; providing an elongate lever that has a first end portion, a second end portion, a top surface and a bottom surface and the elongate lever is pivotally interconnected to the cylindrical housing within the partial circumferential cut out portion, and the elongate lever is movable between a resting position and an activated position relative to the cylindrical housing by pivoting upon a fulcrum pin that is positioned in aligned holes defined therein to pivotally interconnect the first end portion of the elongate lever to the cylindrical housing within the circumferential cut-out, and an inclined ramp is carried on the top surface of the elongate lever between the first end portion of the elongate lever and the second end portion of the elongate lever, and a raised cylindrical projection is carried on the top surface of the elongate lever proximate the second end portion of the elongate lever to engage with and carry a coil spring thereon that frictionally communicates with the generally cylindrical housing so as to bias the elongate lever toward the resting position, and a rectangular projection is carried on the top surface of the elongate lever between the raised cylindrical projection and a proximate end portion of the inclined ramp, the rectangular projection defines a transversely aligned slotted hole therein; providing a decent reed, and positionally securing the detent reed on the inclined ramp of the elongate lever, and the detent reed is formed of a resilient metal which emits an audible and tactile simulation that replicates a release and reset of the firing pin of the semi-automatic rifle when the elongate lever is moved between the resting position and the activated position responsive to activation of the trigger of the semi-automatic rifle and return of the trigger to an unfired position; providing a transfer block that operatively communicates between the trigger of the semi-automatic rifle and the bottom surface of the elongate lever proximate the second end portion of the elongate lever, for transferring movement of the trigger of the semi-automatic rifle to the elongate lever and to cause the elongate lever to pivot between the resting position and the activated position; and providing a hammer block that operatively communicates with the hammer of the semi-automatic rifle so that the trigger of the semi-automatic is movable without activating the hammer of the semi-automatic rifle.

8. The method for manufacturing a dry fire training device for a semi-automatic rifle of claim 7 and further comprising the step: defining plural pairs of transversely extending and axially aligned through holes in the generally cylindrical housing for carriage of a pin to interconnect movable components to the generally cylindrical housing.

9. The method for manufacturing a dry fire training device or a semi-automatic rifle of claim 7 and wherein the inclined ramp carried on the top surface of the elongate lever is comprised of two angled projections for mounting the detente reed.

10. The method for manufacturing a dry fire training device for a semi-automatic rifle of claim 7 and further comprising the step: defining a threaded hole in the upper section of the generally cylindrical housing and providing a set screw that is carried in the threaded hole defined in the upper section of the generally cylindrical housing, and the 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.

11. The method for manufacturing a dry fire training device for a semi-automatic rifle of claim 7 and further comprising the step; providing a coil spring and positioning the coil spring on the raised cylindrical projection on the top surface of the elongate lever so that the coil spring operatively communicates with the generally cylindrical housing to provide a do inward force to return the elongate lever to the resting position; and providing a second coil spring to bias the axially movable plunger toward the first end portion of the cylinder to positionally align the dry fire training device in the semi-automatic rifle's bolt carrier group compartment.

12. The method for manufacturing a dry fire training device for a semi-automatic rifle of claim 7 and wherein the transfer block frictionally communicates with the trigger of the semi-automatic rifle, and the transfer block moves up and down responsive to movement of the trigger of the semi-automatic rifle; and the transfer block communicates the up and down movement to the bottom surface of the elongate lever.

Description

BRIEF DESCRIPTION OF THE SEVERAL VIEWS OF THE DRAWINGS

[0023] FIG. 1 illustrates an isometric view of a cylinder with various holes and cutaways.

[0024] FIG. 1-A illustrates an end view of the cylinder showing a recessed plug with the cylindrical depression for one end of one of the coil springs.

[0025] FIG. 2 illustrates an isometric view of a plunger.

[0026] FIG. 2-A illustrates an end view of the plunger showing a cylindrical depression for one end of one of the coil springs.

[0027] FIG. 3 illustrates a detent reed.

[0028] FIG. 4 illustrates an isometric view of a coil spring.

[0029] FIG. 5 illustrates an isometric view of a lever.

[0030] FIG. 6 illustrates an isometric view of a hammer block.

[0031] FIG. 7 illustrates an isometric view of a transfer block.

[0032] FIG. 8 illustrates an isometric view of a set screw.

[0033] FIG. 9 illustrates an isometric view of a hinge pin.

[0034] FIG. 10 illustrates a middle sectional view of an assembly of the bolt carrier group in its resting position.

[0035] FIG. 11 illustrates a middle sectional view of an assembly of the bolt carrier group in its activated position.

DETAILED DESCRIPTION OF THE INVENTION

[0036] 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 midsection for mounting the regulating screw 8 for adjusting the detent reed 3.

[0037] 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.

[0038] 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.

[0039] 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.

[0040] FIG. 3 illustrates the detent reed 3 that supplies the snap sound and the tactile feel of the simulated release of the rifle's firing pin.

[0041] 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.

[0042] 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 detent reed 3, a rectangular projection that houses a slotted hole to guide the lever 5 in it's 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 coil springs 4.

[0043] FIG. 6 illustrates the hammer keeper 6 which prevents the hammer frog falling when the trigger is activated.

[0044] 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.

[0045] FIG. 8 illustrates the set screw 8 that is used to regulate when in the movement of the lever 5 assembly that the detent reed 3 activates.

[0046] FIG. 9 illustrates the fulcrum pin 9 that pins the various parts together and/or allows for the controlled move met t of these parts.

[0047] 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 detent 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 set screw 8 which allows for the adjusting of the position when the detent reed 3 snaps, simulating the release and reset of the rifle's firing pin.

[0048] FIG. 11 illustrates a sectional drawing of the assembled bolt carrier group in its activated position showing the lever 5 raised, the detent reed 3 bent and activated, and the transfer block 7 raised.