Abstract: An improved fastener installation tool is provided of the type having a fixture pin for seated reception into a mating recess at the shank end of a threaded fastener, while a power-driven tool socket installs a threaded nut onto the fastener shank. The installation tool includes an improved spring-loaded clutch unit for normally supporting the fixture pin against rotation, but permitting fixture pin rotation in response to a torque load exceeding a predetermined limit thereby preventing fixture pin breakage. The clutch unit is adapted for quick and easy disengagement from the fixture pin, and pivotal displacement to an out-of-the-way position to permit quick and easy fixture pin removal and replacement.

Abstract: An improved fastener installation tool is provided of the type having a fixture pin for seated reception into a mating recess at the shank end of a threaded fastener, while a power-driven socket installs a threaded nut onto the fastener shank. The installation tool incorporates a simplified spring-loaded clutch assembly including a dual function spring member for urging the fixture pin axially forwardly relative to the power-driven socket, whereby the fixture pin slidably retracts against the applied spring force as the nut is threaded onto the fastener shank. The spring member additionally urges a cam pin into normal engagement with a lobed cam wheel carried by the fixture pin for normally preventing fixture pin rotation, but wherein the cam pin retracts to accommodate limited fixture pin rotation in response to a torque overload condition thereby protecting the fixture pin against deformation or breakage.

Abstract: An improved fastener installation tool is provided of the type having a fixture pin for seated reception into a mating recess at the shank end of a threaded fastener, while a power-driven socket installs a threaded nut onto the fastener shank. The installation tool incorporates a simplified spring-loaded clutch assembly including a dual function spring member for urging the fixture pin axially forwardly relative to the power-driven socket, whereby the fixture pin slidably retracts against the applied spring force as the nut is threaded onto the fastener shank. The spring member additionally urges a cam pin into normal engagement with a lobed cam wheel carried by the fixture pin for normally preventing fixture pin rotation, but wherein the cam pin retracts to accommodate limited fixture pin rotation in response to a torque overload condition thereby protecting the fixture pin against deformation or breakage.

Abstract: An improved fastener installation tool is provided of the type having a fixture pin for seated reception into a mating recess at the shank end of a threaded fastener, while a power-driven socket installs a threaded nut onto the fastener shank. The installation tool includes a spring-loaded clutch assembly for supporting the fixture pin on the tool, wherein the clutch assembly permits fixture pin rotation in response to a torque load exceeding a predetermined limit to prevent fixture pin breakage in the event of a high torque load applied thereto.