Patent ID: 6959625

Claim:
A fastener installation tool, comprising: a tool head; a socket mounted on said tool head for receiving and supporting a threaded nut; drive means for rotatably driving said socket to install the nut onto a threaded fastener; a fixture pin mounted on said tool head generally coaxially within said socket, said fixture pin having a tip end for engaging and retaining a threaded fastener to substantially prevent fastener rotation during thread-on installation of a nut; said fixture pin being axially movable relative to said socket, and said socket being rotatable relative to said fixture pin; and a clutch assembly for rotatably supporting said fixture pin within said socket to permit fixture pin rotation in response to a torque load applied thereto in excess of a predetermined limit, whereby said clutch assembly safeguards said fixture pin against breakage in response to a torque load applied thereto; said clutch assembly including a cam wheel carried by said fixture pin and defining a plurality of generally radially outwardly open cam seats; said clutch assembly further including a multi-function spring member having a primary spring element applying an axially directed first spring force urging said fixture pin in a forward direction toward the fastener, and a secondary spring element applying a radially directed second spring force urging a cam pin carried thereby into normal seated engagement with one of said radially outwardly open cam seats defined by said cam wheel.