Rapid locking system of the trigger plate to the action body of a firearm

Abstract

A rapid locking system ( 30 ) of a trigger plate ( 22 ) equipped with a crosspiece ( 23 ) to the action body ( 21 ) of a firearm comprises a plunger ( 41 ) integral with the action body, holding means ( 50 ) integral with the trigger plate destined for engaging the plunger ( 41 ), the holding means ( 50 ) being rotatingly controlled to pass from an unblocked position to an engagement with the plunger ( 41 ) in a predefined arc, elastic means ( 68 ) acting on the holding means ( 50 ) to keep the coupling between the holding means ( 50 ) and the plunger ( 41 ) under tension.

1 . A rapid locking system ( 30 ) of a trigger plate ( 22 ) equipped with a crosspiece ( 23 ) to the action body ( 21 ) of a firearm, characterized in that it comprises:
 a plunger ( 41 ) integral with the action body;   holding means ( 50 ) integral with the trigger plate destined for engaging said plunger ( 41 ), said holding means ( 50 ) being rotatingly controlled to pass from an unlocked position to an engagement with the plunger ( 41 ) in a predefined arc;   elastic means ( 68 ) acting on said holding means ( 50 ) to keep the coupling between the holding means ( 50 ) and the plunger ( 41 ) under tension.   
   
   
       2 . The rapid locking system ( 30 ) according to  claim 1 , wherein said plunger ( 41 ) comprises a hole ( 48 ) from which a neck ( 42 ) extends, terminating in a spherical portion ( 43 ) destined for engagement with the holding means ( 50 ). 
   
   
       3 . The rapid locking system ( 30 ) according to  claim 2 , wherein said holding means ( 50 ) are in the form of a bush ( 51 ) provided with a transversal slit ( 52 ) which extends for most of the circumference of the bush ( 51 ), said slit having a dimension slightly greater than the diameter of the neck of the plunger ( 41 ) and terminating with a spherical seat ( 53 ) destined for receiving the spherical portion ( 43 ) of the plunger ( 41 ). 
   
   
       4 . The rapid locking system ( 30 ) according to  claim 3 , wherein said spherical seat ( 53 ) has an internal surface ( 54 ) in the form of a curvature which is variable with respect to the rotation centre (C 1 ) of the bush so that by rotating the bush, the plunger is drawn by this. 
   
   
       5 . The rapid locking system ( 30 ) according to  claim 3 , wherein on the front of the bush ( 51 ) there is a shaped imprint ( 67 ) which is star-shaped or hexagonal or having a similar shape, for receiving the corresponding head of a locking key ( 70 ). 
   
   
       6 . The rapid locking system ( 30 ) according to  claim 5 , wherein said bush ( 51 ) has, along a circumferential edge, an annular throat ( 66 ) terminating in a stop ( 61 ), suitable for coming into contact with the counterpart ( 56 ), the stop ( 61 ) being destined for blocking the rotation of the bush in an unlocked position of the system to allow the insertion of the plunger ( 41 ). 
   
   
       7 . The rapid locking system ( 30 ) according to  claim 1 , wherein said elastic means ( 68 ) are produced in the form of a crescent made of an elastomeric material destined for copying a portion of the circular profile of the bush for keeping it elastically pressed, the crescent ( 68 ) having a hole ( 69 ) for the passage of the spherical portion ( 43 ) and the neck ( 42 ) of the plunger ( 41 ). 
   
   
       8 . The rapid locking system ( 30 ) according to  claim 2 , wherein said plunger ( 41 ) has a hole ( 48 ) for the insertion of a transversal pin ( 44 ) and a spiral spring ( 45 ) to allow the plunger to oscillate to facilitate its insertion into said trigger plate ( 22 ) and follow the rotation which the latter must effect to become fixed to the action body ( 21 ), said action body ( 21 ) having an opening ( 46 ) with holes ( 47 ) on the walls to house the pin ( 44 ) carrying the plunger ( 41 ). 
   
   
       9 . The rapid locking system ( 30 ) according to  claim 8 , wherein said action body ( 21 ) is provided with an opening ( 46 ) with holes ( 47 ) on the walls to house the pin ( 44 ) carrying the plunger ( 41 ). 
   
   
       10 . The rapid locking system ( 30 ) according to  claim 9 , wherein said crosspiece ( 23 ), which extends substantially perpendicularly with respect to the trigger plate in the direction of the action body, has at the upper end, a duct ( 60 ) for receiving the spherical portion ( 43 ) and the neck ( 42 ) of the plunger ( 41 ) from above, and, along the rear surface, a cavity ( 59 ) for housing the holding means ( 50 ) and the elastic means ( 68 ). 
   
   
       11 . The rapid locking system ( 30 ) according to  claim 10 , wherein said cavity ( 59 ) which is substantially oval and narrowed is situated in a position above the engagement hole ( 57 ) of a tie-rod ( 24 ) of the stock which can be fixed to said plate, said cavity ( 59 ) having a shaped annular grooving ( 58 ) along the outer edge, suitable for receiving a ring-shaped stop plate ( 55 ) from which a counterpart ( 56 ) extends, said stop plate ( 55 ) being destined for being inserted on the terminal portion of the tie-rod ( 24 ) of the stock to be withheld inside the grooving ( 58 ) and in turn to withhold the holding means ( 50 ) inside the hole ( 59 ) limiting their rotation. 
   
   
       12 . The rapid locking system ( 30 ) according to  claim 1 , wherein for the assembly of the trigger plate ( 22 ) onto the action body ( 21 ), there is a lug ( 25 ) in the trigger plate close to the opposite end of the crosspiece ( 23 ), for being hinged to a corresponding shoulder ( 26 ) of the action body and a pair of rounded flaps ( 27 ) protruding from the top of the crosspiece ( 23 ) to be inserted in the corresponding seats ( 49 ) symmetrically arranged on the two sides of the action body ( 21 ).