Patent ID: 8720765
Filing Date: 2014-05-13
Classification: B25C

Abstract:
1. A nailing machine comprising: a housing; a motor disposed in the housing to rotate a drum; a cylindrical guide disposed in the housing that defines an axial direction and a radial direction; a wire member extending in the axial direction, one end being connected to the drum and the other end being connected to an urging member movable in the cylindrical guide in the axial direction; a blade connected to the urging member for driving a nail into a target member; and a coil spring disposed in the cylindrical guide and including a first end potion positioned at an upper end of the cylindrical guide, a second end portion positioned at a lower end of the cylindrical guide and a central portion positioned between the first and second end portion, the coil spring is expanded or compressed by the motor to store an elastic energy therein and accelerates the urging member by releasing the elastic energy to drive the nail into the target member, wherein a coil pitch of the first end portion and the second end portion of the coil spring in the axial direction is smaller than that of the central portion of the coil spring.