TECHNICAL FIELD
This disclosure provides a manual charger mechanism for a gun, such as a GAU-21 gun.
BACKGROUND
A legacy charging design for a GAU-21 weapon does not have acceptable clearances for mounting its cradle externally on aircraft. This disclosure provides a compact charging design that allows the cradle to be mounted externally, such as on an aircraft, with adequate clearances.
The legacy charging design also has charging forces that are too high. This disclosure provides a design that reduces charging forces, making it easier for a user to charge the weapon.
SUMMARY
A mechanical gun charger configured to charge a gun, including a cradle configured to support a gun. A lever is rotatably coupled to the cradle, wherein an outboard cable coupled between the lever and a first pulley is configured such that displacement of the lever causes the first pulley, a shaft, and a second pulley to rotate. A charging cable is coupled to the second pulley and is configured to couple to and charge the gun upon rotation of the second pulley.
BRIEF DESCRIPTION OF THE FIGURES
FIG. 1 illustrates a perspective view of a GAU-21 gun placed in a cradle having a manual charging system;
FIG. 2 and FIG. 3 illustrates the manual charging system with the cables removed for clarity;
FIG. 4 illustrates an outboard cable that is wrapped once around a tracked perimeter of a small pulley, and then fixed to the small pulley at a point using a quick release ball swage, and a charging cable extending from a gun bolt stud of the gun, and then fixed to the large pulley at point using a quick release latch;
FIG. 5 illustrates a user pulling the charging handle, where the outboard cable pulls the small pulley and consequently the shaft and the large pulley, the large pulley causing the charging cable to pull the gun bolt stud of the gun rearward to charge the weapon;
FIG. 6 illustrates the large pulley; and
FIG. 7 illustrates an inner spacer assembly configured to locate the large pulley in its correct position to align with the gun's charging cable behind the gun bolt stud.
DETAILED DESCRIPTION
FIG. 1 through FIG. 7 illustrates a manual charging system 20 configured to charge a gun 10. The charging system 20 includes a geared pulley system which reduces the charging force to manually charge the gun 10.
FIG. 1 illustrates a perspective view of a GAU-21 gun generally shown at 10 in a cradle 12 having a manual charging system generally shown at 20 according to this disclosure.
As shown in FIGS. 1-5, the charging system 20 includes a charging handle 22 having a cam 24 on one end and a lever extending from the cam 24, a small pulley 26, a large pulley 42, an outboard cable 28, and a charging cable 40 which together reduce the charging force. The outboard cable 28 and the charging cable 40 are not shown in FIGS. 1-3 for clarity, and are shown in FIGS. 4-5. The small pulley 26 is rotatably mounted to the outboard left hand (LH) side of the cradle 12. A pulley guard 52 is annularly positioned over a peripheral track of the small pulley 26. Pulley guard 52 encompasses the small pulley 26 and keeps the outboard cable 28 from coming loose and falling off the track on small pulley 26.
As shown in FIG. 4 and FIG. 5, the outboard cable 28 is fastened at one end to the charging handle 22 proximate the cam 24 at thumb screw 34, and to the small pulley 26 at point 30 using a ball swage at the other end. The outboard cable 28 is wrapped once around the small pulley 26 in a peripheral track thereof and is fixed at point 30 to the small pulley 26 in order to set the rotational direction. The small pulley 26 is secured to an outside end portion of a shaft 54 at one end of the shaft 54, and the large pulley 42 is secured to an inside end portion at the other end of the shaft 54, behind the gun 10. The small pulley 26 and large pulley 42 rotate in unison in the same direction as they are fixedly coupled to the common shaft 54.
The tension-adjusting thumb screw 34 on the charging handle 22 is configured to adjust the tension in the outboard cable 28 such that there is always a proper amount of tension in the outboard cable 28 and to avoid slack. A torsion spring 56 keeps the charging handle 22 in a home position (FIG. 4) against a stud stop 38 when not in use. The charging handle 22 is configured to rotate approximately ⅓ turn to charge the gun 10.
As shown in FIG. 4 and FIG. 5, the charging cable 40 is connected to and extends from a gun bolt stud 46 of gun 10 at one end, and is fixed to the large pulley 42 at point 44 using a quick release latch 58 (FIG. 6) at the other end of the charging cable 40. The large pulley 42 is fixed to the shaft 54. The charging cable 40 is routed into a cable housing of gun 10 and is fixed to the gun bolt stud 46. Charging cable 40 pulls gun bolt stud 46 rearward. Charging cable 40 rotates around the large pulley 42 when the charging handle 22 is pulled to charge gun 10.
As shown in FIG. 5, by pulling the charging handle 22 clockwise (as viewed from the LH side), the outboard cable 28 pulls the small pulley 26, and consequently the shaft 54 and large pulley 42. Turning large pulley 42 causes the charging cable 40 to pull the gun bolt stud 46 of gun 10 rearward to charge the gun 10. FIG. 6 shows the large pulley 42 having the quick release latch 58 that allows the gun's charging cable 40 to be used. The latch 58 can pivot 90° and lock in place so that the end of charging cable 40 does not slide out when installed.
As shown in FIG. 3 and FIG. 7, an inner spacer assembly 60 having an opening 63 configured to receive the shaft extending therethrough, such that the assembly 60 is interposed between the small pulley 26 and the large pulley 42. The assembly 60 is configured to precisely locate the large pulley 42 in its correct position to align with the gun's charging cable 40. The perimeter of the large pulley 42 is linearly aligned behind the gun bolt stud 46 and the cable housing 47, as shown in FIG. 4 and FIG. 5. The assembly 60 has a ball plunger 62 that rides in a track 64 (FIG. 6) on the large pulley 42. This ball plunger 62 is intended to keep the large pulley 42 from rotating due to tension in the outboard cable 28 when the gun's charging cable 40 is not connected to the large pulley 42. The tension from the gun's charging cable 40 is enough to offset the tension in the outboard cable 28 so there is no rotation when it is connected.
The foregoing detailed description is to be clearly understood as being given by way of illustration and example only, the spirit and scope of the present disclosure being limited solely by the appended claims.
Patent Application
20160109199
