Patent ID: 6676001
Filing Date: 2004-01-13
Classification: B25B

Abstract:
A screw positioning device for a screw driving gun that includes a gun housing, a screw-driving shaft, and a barrel unit, the barrel unit having a stationary barrel part secured to and projecting outwardly from the gun housing so as to define a shaft-receiving chamber for receiving the screw-driving shaft therein, and a slidable barrel part mounted on and slidable relative to the stationary barrel part, the slidable barrel part defining a screw-receiving chamber for receiving a screw that is detachably retained on a belt and that is fed into the screw-receiving chamber in a transverse direction relative to an axis of the screw-driving shaft, the screw being driven by the screw-driving shaft and extending out of the slidable barrel part upon sliding movement of the slidable barrel part toward the gun housing, said screw positioning device comprising:a tubular member having a coupling end adapted to be connected co-axially to the slidable barrel part for co-movement therewith relative to the screw, a discharge end opposite to said coupling end, and a peripheral wall extending between said discharge and coupling ends and defining a screw-guiding chamber therein, said tubular member being slidable together with the slidable barrel part relative to the screw along the axis to a discharging position, in which the screw extends into said screw-guiding chamber; and at least two opposing spring-biased screw-holding units disposed within said screw-guiding chamber, mounted on said peripheral wall, and including first and second urging members and first and second screw-holding members which radially project from said peripheral wall into said screw-guiding chamber and which are respectively urged by said first and second urging members to move toward each other in such a manner that said first and second screw-holding members come into contact with the screw and are pushed by the screw to move radially away from each other against said first and second urging members and that said first and second screw-holding members are urged by said first and second urging members to abut against the screw when said tubular member is slid to said discharging position, thereby positioning the screw at a center position, in which the screw extends along the axis.