Boring tool

A boring tool adapted for operation in a limited workspace for boring holes through a workpiece against which the tool is placed, said boring tool comprising:

• a elongated rigid housing,
• angle drive means mounted adjacent a first end of said housing to deliver rotation about an axis transverse to the length of said housing,
• a boring bit slidably and drivably mounted on said angle drive means so as to permit axial movement of said boring bit while being rotated about said transverse axis, and
• transmission means mounted on said housing for transmitting rotation from a power source adjacent the second end of said housing to said angle drive means,
• said boring bit comprising a shaft via which the boring bit is coupled with said angle drive means, a second shaft telescopically engaged and keyed with said first shaft so as to be axially shiftable relative to the first shaft while being rotatably coupled with the first shaft, a cutting head mounted on the second shaft at the axial end thereof nearer the workpiece, resiliently yieldable means operatively disposed between the two shafts for biasing the second shaft axially relative to the first shaft away from the workpiece but resiliently yielding during certain boring operations so as to allow the second shaft to advance axially toward the workpiece relative to the first shaft, said first shaft having an axial lost motion connection with said angle drive means limited by stops, said cutting head comprising a screw thread for engaging the workpiece to advance the cutting head into the workpiece upon rotation of said boring bit by said angle drive means so as to bore a hole into the workpiece, said axial lost motion connection providing axial advancement of said first and second shafts in unison during boring operations until said resiliently yieldable means begins to yield.