Abstract: An automatic power-driven screwdriver comprises a first cylindrical member having a hand grip portion, a guide portion, a tapered portion and a flanged portion between the tapered and hand grip portions. A second cylindrical member, which is a nose portion of the screwdriver, is mounted to telescope over the guide portion. A third cylindrical member encircles the guide portion and is slidably mounted at one end over the second cylindrical member. The third member is formed with a tapered contacting surface complementary to the surface of the tapered portion of the first member. An adjusting nut having an inwardly extending flange is mounted on the first member with the flange being in contact with the flanged portion and is threadably engaged with the third member so that the tapered contacting surfaces are brought into firm pressure contact which enables the first and second cylindrical members to be secured firmly together.

Abstract: A fluid servicing unit for use in an automatic fastener feeding and driving apparatus of a type including a fastener container, a fastener driving tool and a mechanism for feeding fasteners successively and one by one from the container to the driving tool, which fluid servicing unit includes an air filter, a pressure regulating valve and an oiler, all being formed and integrated in a single block without substantially requiring unnecessary pipings.