Buttstock of electric air gun

Abstract

The buttstock for an electric air gun contains a main unit, an extension unit configured to a front end of the main unit, a detachable and adjustable butt unit configured to a rear edge of the main unit, and a cheek support unit that can be raised or lower along a top edge of the main unit. The extension unit can be telescoped out of the main unit and the butt unit can also be extended backward for different distance so as to suit users of various arm lengths. The cheek support unit on the other hand can be raised to various heights so that users of different neck lengths can more comfortably operate the electric air gun.

1 . A buttstock, comprising:
 a main unit comprising a tubular section as an upper portion, a first section and a second section jointly as a lower portion beneath the tubular section where the tubular section has an exposed middle segment and an upward extending positioning hole along a bottom side of the tubular section, and the second section has an indentation along a rear side;   an extension unit comprising a tubular body with a plurality of positioning notches along a bottom edge where the tubular body is slidably plugged into the tubular section and a bolt runs through the positioning hole into one of the positioning notches so as to lock the extension unit;   a cheek support unit joined to and covering the exposed middle segment of the tubular section, comprising a saddle-like cover and a threaded first shaft beneath the cover, where the first shaft runs through the first and second sections and a first rotatory wheel; and   a butt unit comprising a front member and a butt member where the butt member comprises a buffer piece and a rear cap, the front member has a forward protruding tubular element in a top portion and a forwardly open through hole in a bottom portion of the front member, a third shaft is threaded through the tubular element, a second shaft is threaded through the through hole and a second rotatory wheel configured in the indentation of the second section;   wherein turning the first rotatory wheel drives the first shaft to move the cover upward or downward so as to fit users of various neck lengths; the extension unit is capable of being telescoped out of the main unit for different distances; turning the second rotatory wheel drives the second shaft to move the butt member outward or inward for different distance; and as such the buttstock is adjustable to suit users of various arm lengths;   wherein the first section has a locking hole above the positioning hole; the front member has a stopping element beneath the tubular element; a bolt is threaded through the locking hole and the stopping element and rotatable between a locking position and an unlocking position to respectively lock and unlock the butt unit to the main unit; the bolt has a notch formed in a middle portion thereof and has a semi-circular cross-section defined by a planar surface at a bottom of the notch such that when the bolt is at the unlocking position, the planar surface extends horizontally and the notch provides a void space above the planar surface to define a passage through which the stopping element of the front member is allowed to move for detachment of the butt unit from the main unit and when the bolt is at the locking position, the planar surface extends vertically to block the passageway and interferes with the movement of the butt unit through engagement between the planar surface and the stopping element of the front member.   
     
     
         2 . The buttstock according to  claim 1 , wherein, on two corresponding inner walls of the cover, there are a plurality of ribs oppositely configured that engages two notches along the exposed middle segment's two bottom edges, respectively, so as to reliably position the cover; there are a pair of blocks oppositely configured besides the ribs on the two corresponding inner walls of the cover; correspondingly, there are a pair of hooks configured along the exposed middle segment's two top edges; the hooks engage the blocks so as to prevent the cover from being moved too high. 
     
     
         3 . The buttstock according to  claim 1 , wherein the third shaft has a hook on a front end; and, as the butt member is moved backward to an extent, the shaft is moved backward as well and the hook engages a limiting element on an inner wall of the tubular element so as to prevent the butt member from being extended too much. 
     
     
         4 . The buttstock according to  claim 1 , wherein the first and second sections have aligned through openings, respectively; the first rotatory wheel is configured in a space formed by the aligned through openings; the second section has a through hole on a top side into the through opening of the second section; the first shaft penetrates through the through hole and into the opening of the second section, and then axially through the first rotatory wheel. 
     
     
         5 . (canceled)