Patent ID: 8459156

Claim:
A tailstock device used in a lathe for holding a workpiece along a longitudinal axis, the lathe having a lathe bed extending in a longitudinal direction, said tailstock device comprising: a mounting base adapted to be slidable on the lathe bed in the longitudinal direction; front and rear mounting posts which are disposed on said mounting base, and which are spaced apart from each other in a transverse direction relative to the longitudinal direction by an accommodation space, said front and rear mounting posts respectively having front and rear bearing walls surrounding a rotary axis oriented in the transverse direction; a rotary shaft having front and rear journal segments which are respectively journalled on said front and rear bearing walls to be turnable about the rotary axis, and a middle segment which is disposed in said accommodation space; a hub mount mounted to turn with said middle segment of said rotary shaft; first and second stage posts extending from said hub mount radially and outwardly to terminate at first and second stage end portions which are angularly displaced from each other about the rotary axis; first and second holders which respectively define first and second lengthwise axes, and which are respectively disposed on said first and second stage end portions, said first and second holders being configured such that, when a selected one of said first and second stage end portions is displaced to a working position, a corresponding one of the first and second lengthwise axes is brought in alignment with the longitudinal axis; and a drive transmitting unit coupled with said rotary shaft to turn said rotary shaft about the rotary axis to thereby displace the selected one of said first and second stage end portions to the working position.