Installing tool for wedging-type fasteners

In combination, a workpiece and a power tool for rotationally driving the workpiece, the combination comprising:

• a first cylindrical outer member on the workpiece;
• a second cylindrical inner member on the workpiece projecting axially from the outer member and being concentrically mounted with respect to the outer member for relative rotation thereto;
• a tool body;
• a drive shaft rotatably mounted in the tool body for rotation about a central axis, the drive shaft including
• a generally tubular open end positioned to receive the inner member of the workpiece and extend in spaced relation therearound;
• a motor means mounted in the tool body for applying torque to the drive shaft to selectively rotate it in opposite directions;
• a nosepiece attached to the tool body in concentric relation to the central axis, the nosepiece including
• a generally tubular open end positioned to receive the outer member of the workpiece at the same time that the inner member of the workpiece is received within the open end of the drive shaft, the open end of the nosepiece extending in spaced relation around the outer member of the workpiece;
• and
• inner and outer cylinder gripping means mounted in the open ends of said drive shaft and said nosepiece releasably gripping said inner and outer members of the workpiece, said inner and outer cylinder gripping means being engaged with and disengaged from the inner and outer members of the workpiece by axial motion of the tool onto and off the workpiece, respectively, rotation of said drive shaft in one rotational direction causing said inner cylinder gripping means to grip the inner member rotating it in the one direction and causing said outer cylinder gripping means to grip the outer member and hold it against rotation, while rotation of said drive shaft in the other rotational direction without disengaging the workpiece causing said inner cylinder gripping means to the inner member rotating it in the other direction and causing said outer cylinder gripping means to grip the outer member and hold it against rotation.

A tool for installing and removing fasteners of the type having axially spaced first and second tool gripping surfaces which are rotated relative to each other to install the fastener in or remove the fastener from a panel, said tool comprising:

• a main tool housing;
• a motor connected to said housing, said motor having an output shaft for rotation in either rotational direction along a central axis of said tool;
• a generally tubular first wrenching portion connected to said housing, said first wrenching portion having
• an inner wall having a plurality of camming surfaces,
• a substantially cylindrical cage positioned concentrically with respect to said inner wall,
• a plurality of rollers mounted in said cage, said rollers being adapted to dialate sufficiently to fit over and engage said first wrenching portion of the fastener when the fastener is inserted into said first wrenching portion of said tool;
• and
• means for biasing said rollers toward the central axis of said tool;
• a generally tubular second wrenching portion spaced axially from said first wrenching portion and connected to said output shaft for rotation therewith, said second wrenching portion having
• an inner wall having a plurality of camming surfaces,
• a substantially cylindrical cage positioned concentrically with respect to said inner wall,
• a plurality of rollers mounted in said cage, said rollers being adapted to dialate sufficiently to fit over and engage said second wrenching portion of the fastener when the fastener is inserted into the second wrenching portion of said tool, and
• means for biasing said rollers toward the central axis of said tool;
• and
• means for actuating said motor to rotate said shaft and said second wrenching portion in either rotational direction, application of torque in either rotational direction causing said rollers of said second wrenching portion to move a limited distance into wedging engagement against said camming surfaces of said inner wall of said second wrenching portion stopping movement of said cage and causing said rollers to grip the second tool gripping surface of the fastener and rotate the second tool gripping surface in the direction of rotation of said output shaft, while said rollers of said first wrenching portion move a limited distance into wedging engagement against said camming surfaces of said inner wall of said first wrenching portion stopping movement of said cage and causing said rollers to grip the first tool gripping surface of the fastener and hold the first tool gripping surface against rotation to set the fastener.