Mount for co-witnessing sighting devices for firearms having sheet metal receiver covers

Abstract

A sight mount for firearms having short sight mount blocks and having sheet metal receiver covers. A mount base is pivotally connected with the sight mount block and has a sight support platform that is positioned above the receiver cover and provides support for an optical sighting device. A lock member has releasable locking engagement with the lock retainer members and having a portion thereof engaging the rear sight block and securing said mount base against movement from said sighting position. A rear sight member is defined by an upturned portion of the lock member and has a sighting notch that is visible in co-witnessing relation when viewing through the optical sighting device.

I claim: 
     
         1 . A sight mount for a firearm having a rear sight block defining opposed pivot openings and having a stamped metal receiver cover extending rearwardly of the rear sight block, said sight mount comprising:
 a mount base having opposed pivot pins received by opposed pivot openings of a rear sight block of a firearm and being pivotally moveable from a sighting position to an out of the way position clear of the stamped metal receiver cover, said mount base defining lock retainer members;   a sight support platform projecting rearwardly from said mount base and providing support for an optical sighting device mounted thereto;   a lock member having releasable locking engagement with said lock retainer members and having a portion there engaging the rear sight block and preventing pivotal movement of said mount base from said sighting position; and   a rear sight member having a sighting notch and being visible in co-witnessing relation with the optical sighting device.   
     
     
         2 . The sight mount of  claim 1 , comprising:
 said mount base having an elongate forwardly extending portion having said opposed pivot pins projecting laterally therefrom;   each of said lock retainer members projecting upwardly from said mount base and having a defined width;   retainer heads of greater dimension as compared with said defined width defining the upper extremity of each of said lock retainer members; and   said lock member having keyholes for each of said lock retainer members, said keyholes being defined by openings of greater dimension than the dimension of said retainer heads and slots of a dimension receiving said lock retainer members in close fitting relation, said lock member being linearly moveable relative to said lock retainer members for selective registry of said keyholes with said lock retainer members and retainer heads.   
     
     
         3 . The sight mount of  claim 1 , comprising:
 said lock member being composed of substantially planar strip material.   
     
     
         4 . The sight mount of  claim 1 , comprising:
 an upstanding rear end portion of said lock member defining said rear sight member and said sighting notch.   
     
     
         5 . The sight mount of  claim 1 , comprising:
 a forward end portion of said lock member being downwardly offset and being disposed in engagement with the sight mount block of the firearm forwardly of said pivot pin and preventing pivotal movement of said sight mount base.   
     
     
         6 . The sight mount of  claim 1 , comprising:
 a magnet receptacle being defined in said mount base and, with said mount base in said sighting position, facing the sight mount block of the firearm; and   a magnet member being secured within said magnet receptacle and applying magnetic force to the sight mount block urging said sight mount base toward said sighting position.   
     
     
         8 . A sight mount for a firearm having a rear sight block defining opposed pivot openings and having a stamped metal receiver cover extending rearwardly of the rear sight block, said sight mount comprising:
 a mount base being secured to the rear sight block and having a sight support platform projecting rearwardly therefrom and providing support for an optical sighting device mounted thereto;   lock retainer members projecting upwardly from said mount base;   a lock member having releasable locking engagement with said lock retainer members and having a portion thereof engaging the rear sight block and securing said mount base against movement from said sighting position; and   a rear sight member having a sighting notch and being visible in co-witnessing relation with the optical sighting device.   
     
     
         9 . The sight mount of  claim 8 , comprising:
 said mount base having pivotal connection with the sight mount block of the firearm;   lock retainer members projecting upwardly from said mount base   a lock member having releasable locking engagement with said lock retainer members and having a portion thereof engaging the rear sight block and securing said mount base against movement from said sighting position; and   a rear sight member being defined by said lock member and having a sighting notch and being visible in co-witnessing relation with the optical sighting device.   
     
     
         10 . The sight mount of  claim 8 , comprising:
 said sight mount defining a first upper surface; and   said sight support platform having a second upper surface being located in substantially parallel relation with said first upper surface and is laterally offset and below the level of said first upper surface.   
     
     
         11 . The sight mount of  claim 8 , comprising:
 lock retainer members projecting upwardly from said mount base and having a defined width;   retainer heads of greater dimension as compared with said defined width defining the upper extremity of each of said lock retainer members; and   said lock member having keyholes for each of said lock retainer members, said keyholes being defined by openings of greater dimension than the dimension of said retainer heads and slots of a dimension receiving said lock retainer members in close fitting relation, said lock member being linearly moveable relative to said lock retainer members for selective registry of said keyholes with said lock retainer members and retainer heads.   
     
     
         12 . The sight mount of  claim 8 , comprising:
 said lock retainer members each having a post section having a defined width and having a retainer head of greater dimension than said defined width; and   said lock member having keyholes for each of said lock retainer members, said keyholes being defined by openings of greater dimension than the dimension of said retainer heads and having slots of a dimension receiving said post section of said lock retainer members in close fitting relation, said lock member being linearly moveable relative to said lock retainer members for selective registry of said keyholes with said lock retainer members and retainer heads.   
     
     
         13 . The sight mount of  claim 4 , comprising:
 an upstanding rear end portion of said lock member defining said rear sight member and said sighting notch.   
     
     
         14 . The sight mount of  claim 8 , comprising:
 a forward end portion of said lock member being downwardly offset and being disposed in engagement with the sight mount block of the firearm forwardly of said pivot pin and preventing pivotal movement of said sight mount base.   
     
     
         15 . The sight mount of  claim 8 , comprising:
 a magnet receptacle being defined in said mount base and, with said mount base in said sighting position, facing the sight mount block of the firearm; and   a magnet member being secured within said magnet receptacle and applying magnetic force to the sight mount block urging said sight mount base toward said sighting position.   
     
     
         16 . A sight mount for a firearm having a rear sight block defining opposed pivot openings and having a stamped metal receiver cover extending rearwardly of the rear sight block, said sight mount comprising:
 a mount base defining an upper surface and having opposed pivot pins received by opposed pivot openings of a rear sight block of a firearm and being pivotally moveable from a sighting position to an out of the way position clear of the stamped metal receiver cover, said mount base defining lock retainer members;   a sight support platform projecting rearwardly from said mount base and providing support for an optical sighting device mounted thereto;   a lock member having releasable locking engagement with said lock retainer members and having a portion there engaging the rear sight block and preventing pivotal movement of said mount base from said sighting position; and   a rear sight member having a sighting notch and being visible in co-witnessing relation with the optical sighting device;   said sight support platform having an upper surface being lower than said upper surface and positioning an optical sighting device sufficiently low that said rear sight member is visible in co-witnessing relation through the optical sighting device.   
     
     
         17 . The sight mount of  claim 1 , comprising:
 said mount base having an elongate forwardly extending portion having said opposed pivot pins projecting laterally therefrom;   each of said lock retainer members projecting upwardly from said mount base and having a defined width;   retainer heads of greater dimension as compared with said defined width defining the upper extremity of each of said lock retainer members; and   said lock member having keyholes for each of said lock retainer members, said keyholes being defined by openings of greater dimension than the dimension of said retainer heads and slots of a dimension receiving said lock retainer members in close fitting relation, said lock member being linearly moveable relative to said lock retainer members for selective registry of said keyholes with said lock retainer members and retainer heads.   
     
     
         18 . The sight mount of  claim 8 , comprising:
 a magnet receptacle being defined in said mount base and, with said mount base in said sighting position, facing the sight mount block of the firearm; and   a magnet member being secured within said magnet receptacle and applying magnetic force to the sight mount block urging said sight mount base toward said sighting position.