Hand tool
OwnerHenry Pinandinventor
Life of this patent
Estimating the term…
Abstract
A hand tool can remove burrs from an aperture in a workpiece. The tool has a hollow handle and a shaft rotatably mounted in the handle to reciprocate axially therein. The tool has a thruster for urging the shaft to extend axially. A rider is mounted in the handle for engaging and rotating the shaft as it extends axially from the handle. This rider can allow axial retraction of the shaft into the handle without rotation. A deburring bit (e.g. a countersink bit) is mounted at an outer end of the shaft. Thus the bit turns when the shaft extends as the handle withdraws from the workpiece.
Claims14
A hand tool for removing burrs from an aperture in a workpiece, comprising:
- a hollow handle having a race;
- a shaft rotatably mounted in said handle to reciprocate axially therein;
- thrust means for urging said shaft to extend axially;
- rolling means mounted in said race in said handle for engaging and rolling on said race and on said shaft to rotate said shaft as it extends axially from said handle, said rolling means being operable to allow axial retraction of said shaft into said handle without rotation;
- and
- a deburring bit mounted at an outer end of said shaft, so that said bit turns when said shaft extends as said handle withdraws from said workpiece.
A hand tool for dressing a workpiece, comprising:
- a shaft having at least one spiral groove;
- a hollow handle for rotatably supporting said shaft and for allowing it to reciprocate axially therein, said handle having a frustro-conical race encircling said shaft;
- a plurality of balls mounted in said race to engage at least said one spiral groove;
- thrust means for urging said shaft to extend axially;
- holding means for urging said balls along said frustro-conical race in a direction to converge with said shaft, said holding means being operable to allow at least one of said balls to skip said spiral groove as said shaft retracts into said handle, so that said shaft turns when said shaft extends as said handle withdraws from said workpiece.
Dependencies are inferred from the claim text.