Patent ID: 8132350
Filing Date: 2012-03-13
Classification: F41A,Y10T

Abstract:
1. A hammer spring assembly for a firearm, the assembly comprising: a spring; a member comprising a strut with a rearward end connected to the spring and arranged, when the hammer spring assembly is connected to a firearm, to operatively couple the spring and a hammer pivotably connected to the firearm so that the spring biases rotation of the hammer about a hammer pivot point in a forward direction toward a cartridge or firing pin; and one or more rolling bearings at a connection point between the strut and the spring that are arranged to guide forward and rearward movement of the connection point between the strut and the spring, wherein: the member is arranged to push against the hammer with a forward end of the strut at the hammer contact point; the member and the spring are arranged so that the spring exerts a bias force on the member in the forward direction; the member is arranged so that, when the hammer spring assembly is connected to the firearm, the bias force urges the member against a curved rearward surface of the hammer at a hammer contact point to exert the bias force on the hammer; and the member and the spring are arranged relative to the hammer, when the hammer spring assembly is connected to the firearm, so that as the hammer rotates, the hammer contact point moves along the curved rearward surface of the hammer so as to cause a desired variation of an effective lever arm about the hammer pivot point of the bias force exerted on the hammer to rotate the hammer in the forward direction.