An adjustable gun butt assembly includes two plates, one of which is attached to the gun butt and the other which is attached to a resilient shoulder pad. The two plates move relative to one another by way of an eccentric cam disposed in one of the plates. The plates are held in frictional contact to one another by a single set screw accessible through an aperture in the resilient shoulder pad. The shoulder pad may be adjusted orthogonally by way of the cam and additional vertical movement is allowed by way of an extended slot. Sand paper may be fixed to one of the plates to provide a frictional grip between the two plates when the set screw is tightened.
Jerry T. Nelson
The invention relates to adjustable gun butts, in which the gun butt may be adjusted both horizontally and vertically, that is orthogonally to a gun stock, and more particularly to a simplified adjustment assembly requiring tightening and loosening a single adjustment screw, preferably through a hole within the gun butt shoulder pad.
Adjustable butt plates and gun pads have developed over the years and are exemplified by U.S. Pat. No. 1,088,362 to Perkins, issued Feb. 24, 1914; U.S. Pat. No. 1,582,395 to Haemmerli, issued Apr. 27, 1926; U.S. Pat. No. 1,651,299 issued to R. V. Stansel on Nov. 29, 1927; and U.S. Pat. No. 1,847,777 to W. J. Morgan, issued Mar. 1, 1932.
The present invention is an improvement and a development from yet another U.S. Pat. No. 2,066,218 to W. J. Morgan, issuing Dec. 29, 1936. The adjustable gun butt of U.S. Pat. No. 2,066,218 permits adjustment simultaneously both horizontally in relation to the gun stock and vertically. A first plate provided with a central slot is secured to the gun stock by means of screws. An adjustable bolt projects through a slot having a head slidably maintained in the recess within the first plate. The face of the first plate remote from the gun stock engages a facing surface of a similarly shaped second plate to permit vertical adjustment of the second plate and the gun butt path in relation to the gun stock. The second plate is provided with a recessed area on the surface opposite that abutting the first plate. A centrally located opening is provided in the recessed area of the second plate of circular form which holds a circular rotatable cam of slightly smaller diameter. The cam is held on the bolt by means of a nut and the rotatable cam provides a horizontal adjustment in the position of the second plate relative to the first plate. The rotatable cam includes a large diameter section mounted within a recess whose diameter is in excess of the lateral width of the second plate bearing that recess. A smaller diameter concentric portion fits within the central opening within the second plate, extending through the second plate from the recess of the second plate. The cam, therefore, is rotated by means of protruding edges which project to opposite lateral sides through holes within the sides of the second plate opening to the recess within that plate. In order to manipulate the cam, the nut on the bolt is loosened. A tapped hole eccentric to the axis of the cam, receives the threaded end of the adjustable bolt with the head of that bolt slidable within the recess of the first plate. After loosening of the adjustable bolt, the second plate may be moved to the right or left of the first plate by rotation of the cam. When the desired adjustment is made, the nut holding the cam on the adjustable bolt is tightened.
While the adjustable gun butt of U.S. Pat. No. 2,066,218 provides both vertical and horizontal adjustment of the gun butt relative to the gun stock, the adjustment mechanism is complicated, requires the loosening of the nut on adjustable bolt, and the manual rotation of the protruding peripheral large diameter portions of the cam outside, to the sides of the second plate supporting the same.
It is, therefore, a primary object of the present invention to provide an improved adjustable gun butt of this type in which there is no need to remove the butt plate cushion from the assembly to effect adjustment, wherein a single set screw accessible through a single hole drilled through a soft cushion forming a shoulder pad permits ready adjustment of the gun butt orthogonally relative to the gun stock via an adjustment assembly of simplified form.