Gun-stock riser for AR15 type tactical firearm

Abstract

A cheek riser mechanism has a mounting base or saddle that is adapted for mounting to a gun-stock and defines guide rail members. A movable cheek riser member has guide grooves that receive the guide rail members and is linearly movable along the length of the guide rails. Upon rearward movement of the charging handle of an AR15 type rifle the movable cheek riser can be engaged and moved rearwardly by the user's hand or by the charging handle so that it does not interfere with a cartridge charging operation. A riser spring is compressed during rearward movement of the cheek riser and returns the movable cheek riser to its use position upon release of the charging handle.

I claim: 
     
         1 . A cheek riser mechanism for attachment to a gun-stock of a firearm having a receiver and a having a movable cartridge charging handle, comprising:
 a cheek riser base member for substantially immoveable mounting to a gun-stock and defining a guide member;   a movable cheek riser member being movably mounted to said cheek riser base member and being guided during movement by said guide member; and   an urging member maintaining said movable cheek riser member at a predetermined use position and being yieldable responsive to application of force to said movable riser member to permit movement of said movable cheek riser member relative to said cheek riser base member and upon removal of said force returning said movable cheek riser to said predetermined use position.   
     
     
         2 . The cheek riser mechanism of  claim 1 , comprising:
 said guide member of said cheek riser base member being a guide rail defined by said cheek riser base member; and   said movable cheek riser member having a guide groove receiving said guide rail in guided relation therein and guiding movement of said movable cheek riser member relative to said cheek riser base member.   
     
     
         3 . The cheek riser mechanism of  claim 1 , comprising:
 said guide member being a plurality of elongate guide rails projecting from said cheek riser base member and being disposed in substantially parallel relation with one another; and   said movable riser member having a plurality of generally parallel elongate rail receiving grooves receiving said elongate guide rails in linear guided relation therein.   
     
     
         4 . The cheek riser mechanism of  claim 1 , comprising:
 said cheek riser base member defining an external surface and an internal surface;   a guide and stop member projecting from said external surface of said cheek riser base member; and   a guide groove located at said internal surface of said movable cheek riser member and having guiding engagement with said guide and stop member.   
     
     
         5 . The cheek riser mechanism of  claim 1 , comprising:
 a pair of spaced cheek riser guide members projecting forwardly from said cheek riser base member;   elongate guide rail members projecting from each of said spaced cheek riser guide members and being disposed in substantially parallel relation with one another; and   said movable cheek riser member having a forward wall structure defining spaced guide slots each receiving one of said elongate guide rail members in guided engagement therein.   
     
     
         6 . The cheek riser mechanism of  claim 1 , comprising:
 said urging member being a spring retainer structure being defined within said cheek riser base member;   a spring passage being defined within said spring retainer structure; and   a helical compression spring and spring plunger being at least partially located within said spring passage, said spring plunger having an end portion thereof disposed in fixed relation with said movable cheek riser member.   
     
     
         7 . The cheek riser mechanism of  claim 6 , comprising:
 said movable cheek riser member defining a front wall; and   said spring plunger having a mounting plate in fixed relation therewith, said mounting plate being mounted in fixed relation with said front wall.   
     
     
         8 . The cheek riser mechanism of  claim 1 , comprising:
 said cheek riser base member being of generally U-shaped cross-sectional configuration and having a downwardly facing elongate recess within which the upper portion of a gun-stock is received;   a plurality of mounting holes being defined by said cheek riser base member; and   fasteners extending through said mounting holes and securing said cheek riser base member in fixed relation with the gun-stock; and   said movable cheek riser member being secured in movable relation with said cheek riser base member and being urged forwardly to a predetermined operational position by said urging device and being movable rearwardly from said predetermined operational position by a force sufficient to overcome the resistance of said urging device.   
     
     
         9 . The cheek riser mechanism of  claim 8 , comprising:
 said cheek riser base member defining an external surface and an internal surface and said movable cheek riser member being of generally U-shaped cross section and defining external and internal surfaces;   a pair of guide and stop members projecting from said external surface of said cheek riser base member; and   a pair of elongate closed end guide grooves located at said internal surface of said movable cheek riser member and having guiding engagement with said guide and stop members;   a plunger passage being defined in said cheek riser base member;   a plunger member being mounted to said movable cheek riser member and having a portion thereof located within said plunger passage;   said urging member being a helical spring surrounding said plunger and having a portion thereof located within said plunger passage, said helical spring yielding to permit rearward movement of said movable cheek riser member from said predetermined use position responsive to a force and moving said movable cheek riser member forwardly to said predetermined use position.   
     
     
         10 . The cheek riser mechanism of  claim 1 , comprising:
 a pair of spaced cheek riser guide members projecting forwardly from said riser base member and defining a pair of generally parallel elongate guide rails; and   said second cheek riser member being of generally U-shaped configuration and having a forward wall defining a pair of internal elongate guide slots receiving said generally parallel elongate guide rails and guiding said movable cheek riser member during linear movement thereof in relation with said cheek riser base member between said predetermined use position and a retracted position.   
     
     
         11 . A cheek riser mechanism of adjustable length for attachment to a gun-stock of an AR15 type tactical firearm having a receiver and a having a charging handle that is moved linearly rearward during cartridge charging, comprising:
 a cheek riser base member of generally U-shaped cross-section defining a recess receiving an upper portion of a gun-stock therein and defining a plurality of fastener holes receiving fasteners mounting said cheek riser base member in substantially immoveable relation with the gun-stock;   a pair of elongate guide rail members projecting from said cheek riser base member;   a movable cheek riser member of U-shaped cross-section being movably mounted to said cheek riser base member and defining guide slots disposed in guided engagement with said elongate guide rail members to permit reciprocating movement of said movable cheek riser member between a predetermined use position and a retracted position; and   an urging member maintaining said cheek riser member at said predetermined use position relative to said cheek riser base member and being movable from said predetermined use position toward said retracted position during rearward manual actuation of the charging handle of the firearm and preventing interference with normal rearward movement of the charging handle during cartridge charging cycling of the firearm, said urging member returning said movable cheek riser member to said predetermined use position when manual force being applied to the charging is released.   
     
     
         12 . The cheek riser mechanism of  claim 11 , comprising:
 said guide member of said first cheek riser member being an elongate guide rail projecting from said first cheek riser member; and   said second cheek riser member having an elongate guide groove receiving said elongate guide rail in linear guided relation therein and guiding linear movement of said second cheek riser member relative to said first cheek riser member.   
     
     
         13 . The cheek riser mechanism of  claim 12 , comprising:
 said guide member being a plurality of elongate guide rails projecting from said cheek riser base member and being disposed in substantially parallel relation with one another; and   said movable riser member having a plurality of rail receiving grooves receiving said elongate guide rails in linear guided relation therein.   
     
     
         14 . The cheek riser mechanism of  claim 11 , comprising:
 a spring retainer structure being defined within said cheek riser base member;   a spring passage being defined within said spring retainer structure; and   a helical compression spring and spring plunger being at least partially located within said spring passage, said spring plunger having an end portion thereof disposed in fixed relation with said movable cheek riser member.   
     
     
         15 . The cheek riser mechanism of  claim 14 , comprising:
 said movable cheek riser member defining a front wall; and   said spring plunger having a mounting plate in fixed relation therewith, said mounting plate being mounted in fixed relation with said front wall.   
     
     
         16 . The cheek riser mechanism of  claim 11 , comprising:
 said cheek riser base member being of generally U-shaped cross-sectional configuration and having a downwardly facing elongate recess within which the upper portion of a gun-stock is received; and   a plurality of mounting holes being defined by said first cheek riser member and receiving fasteners securing said first cheek riser member in fixed relation with the gun-stock.   
     
     
         17 . The cheek riser mechanism of  claim 16 , comprising:
 a plurality of internal structural rib members being defined within said cheek riser base member and being disposed for engagement with a gun-stock to which said cheek riser base member is mounted.   
     
     
         18 . The cheek riser mechanism of  claim 11 , comprising:
 a pair of spaced cheek riser guide members projecting forwardly from said cheek riser base member and define a pair of generally parallel elongate guide rails projecting from said generally U-shaped riser base member;   said movable cheek riser member being of generally U-shaped configuration and having a front wall defining a pair of spaced guide slots within which said generally parallel elongate guide rails are received for guiding reciprocating movement of said front wall portion of said movable cheek riser member;   said cheek riser base member defining guide and stop projections; and   said pair of internal elongate guide grooves receiving said guide and stop projections in guided relation and guiding linear movement of said movable cheek riser member between a use position and a retracted position.