Semi-automatic pistol with a dual safety

A semi-automatic pistol comprising a frame including a receiver and a depending handle, a trigger pivotally mounted on said frame generally at the intersection of the handle and receiver, said trigger including a finger receiving portion and an upper portion, a hammer pivotally mounted in said frame for movement about a pivot axis between cocked and firing position, drawbar means connected to said upper portion of said trigger and extending rearwardly toward and in underlying relation to a lower end of said hammer, spring means biasing the finger receiving portion of the trigger forwardly and the drawbar means forwardly and upwardly for engaging the drawbar means with said lower end of the hammer, coacting engagable means on the lower end of the hammer and the drawbar means to pivot the hammer to said cocked position and the release the hammer for pivotal movement to said firing position, a hammer spring engaged with said hammer for spring biasing the hammer toward said firing position, a hammer spring support mounted on said handle to support the hammer spring in position for biasing the hammer toward said firing position, means supporting the hammer spring support on the handle of the frame to enable the hammer spring support to be released and moved downwardly away from the hammer to release the spring bias force exerted by the hammer spring on the hammer thereby forming a safety to enable the hammer to remain in a non-firing position even when the trigger and drawbar means are actuated, wherein the coacting engagable means between the drawbar means and lower end of the hammer including an upwardly facing notch in the drawbar means, a downwardly facing notch in said lower end of the hammer defined by two projections having generally flat lower ends, a trailing edge of the notch in the drawbar means engaging a leading edge of the notch in the hammer for pivoting an upper end of the hammer rearwardly, said lower end of the hammer moving forwardly and compressing the hammer spring when the drawbar means is moved forwardly, said flat ends on the trailing projection of the hammer engaging the drawbar means rearwardly of the notch as the drawbar means moves forwardly and causing the drawbar means to move downwardly in relation to said pivot axis of the hammer for releasing the notch in the drawbar means from the notch in said lower end of the hammer as the flat end of the projection forming the leading edge of the notch in the hammer is elevated above a top corner of the trailing edge of the notch in the drawbar means to release the hammer to enable the compressed hammer spring to rapidly pivot the hammer towards said firing position for engagement with a firing pin, said handle including a generally vertically disposed cavity receiving a cartridge magazine, said hammer spring support including a retainer at a lower end thereof for releasably securing the cartridge magazine in the handle, said hammer spring support being constructed of two components interconnected by a hinge pin, one of said components being said retainer and a spring biasing the magazine retainer on the lower end of the spring support into engagement with the magazine and enabling the retainer to move away from the magazine for removal and insertion of the magazine in the handle.