Wrench

A wrench for attaching a tip having a threaded shank and a non-circular portion to a tool including a housing having a non-circular interior end and a rotatable shaft within the housing having a non-circular exterior segment and a threaded bore, said wrench comprising:

• a hub including a projection, a wall surrounding said projection and an opening extending through said projection, at least a portion of said opening being defined by a non-circular inner wall adapted to matingly receive the non-circular exterior segment of the shaft, and at least a portion of said projection having an outer non-circular section adapted to be matingly received within the non-circular interior end of the housing so that said projection engages the shaft and the housing to thereby prevent rotation of the shaft relative to the housing;
• and
• a rotary part including a passage for receiving the tip, said passage being generally aligned with said opening of said hub, at least a portion of said passage being defined by a non-circular interior wall adapted to matingly receive the non-circular portion of the tip so that rotation of said rotary part causes the threaded shank of the tip to be screwed into the threaded bore of the shank, said rotary part further including a handle element with a front end and a coupling structure fixed to said front end of said handle element to define a cavity for receiving said wall of said hub.

A wrench comprising:

• a rotary part including a handle element and a coupling structure fixedly attached to one end of said handle element, said handle element including an axial passage open on at least said one end, said passage having at least a non-circular portion adjacent said one end, said coupling structure including a forwardly opening cavity concentric with said axial passage;
• and
• a hub received within said cavity and including a projection and an axial opening extending through said projection, said axial opening being in alignment with said axial passage of said rotary part, at least a portion of said axial opening being defined by a non-circular inner wall, and at least a portion of said projection having an outer non-circular section;
• and
• said rotary part and said hub including connecting structures which interconnect said rotary part and said hub such that said rotary part is freely rotatable about said hub and translatable a limited distance relative to said hub.

An assembling system comprising:

• a tip having a threaded shank and a non-circular portion;
• a tool including a housing having a non-circular interior end and a rotatable shaft within the housing having a non-circular exterior segment and a threaded bore;
• and
• a wrench for attaching said tip to said end of said shaft, said wrench comprising:
• a hub including a projection and an opening extending through said projection, at least a portion of said opening being defined by a non-circular inner wall adapted to matingly receive the non-circular exterior segment of the shaft, and at least a portion of said projection having an outer non-circular section adapted to be matingly received within the non-circular interior end of the housing so that said projection engages the shaft and the housing to thereby prevent rotation of the shaft relative to the housing;
• and
• a rotary part including a passage for receiving the tip, said passage being generally aligned with said opening of said hub, at least a portion of said passage being defined by a non-circular interior wall adapted to matingly receive the non-circular portion of the tip so that rotation of said rotary part causes the threaded shank of the tip to be screwed into the threaded bore of the shank.