| 摘要 |
A jaw carrier arrangement is provided with a main jaw carrier which removably mounts a top jaw. The jaw carrier has a bore opening outwardly through a front face for receiving a rear support post provided on the top jaw. A clamping structure is provided on the jaw carrier to securely and rigidly hold the top jaw in snug engagement with the front face. The clamping arrangement includes radially inner and outer clamping members having opposed riblike wedges which project inwardly toward the post for engagement within wedgelike grooves which are formed on diametrically opposite sides of the post and extend perpendicularly thereacross. The inner and outer clamping members are controlled by rotation of a threaded spindle which causes simultaneous movement of the clamping members in opposite directions, whereby the clamping members move inwardly so that the ribs engage the grooves on opposite sides of the post to securely clamp the post therebetween, and at the same time effect a snug drawing in of the post and of the top jaw against the front face of the chuck.
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