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US 4,819,527 AGranted
Threading machine chuck
AssigneeEmerson Electric Co.
InventorJames C. Redman
Life of this patent
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AssigneeEmerson Electric Co.
InventorJames C. Redman
Estimating the term…
A rotatable chuck workpiece for a power driven threading machine is disclosed comprising a tubular spindle having front and rear ends and front and rear workpiece engaging jaws respectively at the front and rear ends. Each front jaw is connected to a corresponding rear jaw by a rod to which the jaws are rigidly attached, and the rods are mounted on the exterior of the spindle for rotation therewith and for pivotal movement relative thereto. A drive plate at the front end of the spindle is mounted coaxially thereon for pivotal movement relative to the spindle and is provided with drive pins interengaging with slots in the front jaws, whereby pivotal movement of the drive plate in opposite directions imparts pivotal movement of the front jaws radially inwardly and outwardly of the spindle axis. The front jaws and the rods to which they are attached provide the only driving connection between the drive plate and the rear jaws, whereby pivotal displacement of the front jaws imparts corresponding pivotal displacement to the rear jaws. Centering finger components are mounted on each of the front and rear jaws and operate to center a workpiece in the spindle relative to the spindle axis during pivotal movement of the jaws radially inwardly of the spindle.
A workpiece chuck comprising, spindle tube means having a spindle axis and axially spaced apart front and rear ends, front and rear workpiece jaw members, means respectively supporting said front and rear jaw members on said front and rear ends of said spindle tube means for pivotal displacement about corresponding jaw member axes parallel to said spindle axis, drive means for pivotally displacing said front and rear jaw members about said jaw member axes radially inwardly and outwardly of said spindle axis, said spindle tube means having an inner periphery and said front and rear jaw members being pivotal inwardly and outwardly of said spindle axis between closed and open positions, said jaw members including workpiece engaging means, said workpiece engaging means in said closed positions of said jaw members engaging a workpiece extending through said spindle tube means in a centered position with respect to said spindle axis, said workpiece in said open positions of said jaw members being in a resting position against said inner periphery, and means separate from said workpiece engaging means and pivotal with said front and rear jaw members for displacing said workpiece from said resting to said centered position during pivotal movement of said jaw members from said open to said closed positions thereof.
In a workpiece chuck including tubular support means having an axis and a workpiece receiving opening therethrough coaxial with said axis and having an inner periphery, a plurality of jaw members mounted on said support means for pivotal movement inwardly and outwardly of said axis between closed and open positions, said jaw members including workpiece engaging means, said workpiece engaging means in said closed positions of said jaw members being adapted to support a workpiece in said opening in a centered position coaxial with said axis, and said workpiece in said open positions of said jaw members being in a resting position against said inner periphery of said opening, the improvement comprising:
Dependencies are inferred from the claim text.