US 5,199,928 AGranted

Threading machine die head

AssigneeEmerson Electric Co.

InventorsPaul W. Gress, Michael R. Sanner

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Abstract

An annular thread cutting die head for a power driven threading machine is comprised of an annular support plate assembly supporting a plurality of radially displaceable threading cutting dies spaced apart about the axis of the die head, and a cam plate assembly coaxial with and pivotal relative to the support plate assembly to radially displace the cutting dies. The cam plate assembly is spring biased to pivot relative to the support plate assembly in the direction to radially retract the cutting dies, and pivoting in the latter direction is controlled by a keeper mounted on the support plate assembly and engaging a keeper track on the cam plate assembly. The keeper is mounted on the support plate assembly for pivotal displacement about a keeper axis parallel to the die head axis, and pivotal displacement of the keeper is controlled by a lever mechanism actuated by a workpiece being threaded to provide for progressive displacement of the cam plate assembly and receding displacement of the cutting dies during the threading operation.

Claims35

Dependent claims

An annular thread cutting die head for a power driven threading machine, said die head having a die head axis and an entrance end and an exit end and comprising, a plurality of thread cutting dies, support plate means coaxial with said die head axis and supporting said cutting dies for displacement radially inwardly and outwardly of said die head axis, cam plate means coaxial with said support plate means and interengaged therewith for relative pivotal displacement in opposite directions about said die head axis, said cam plate means including means to displace said cutting ides radially inwardly and outwardly relative to said die head axis in response to said pivotal displacement in opposite directions thereabout, cam plate biasing means biasing said cam plate means to pivot about said die head axis in the direction to displace said cutting ides radially outwardly thereof, cam plate keeper means mounted on said support plate means for pivotal displacement between latched and released positions about a keeper axis parallel to said die head axis, said keeper means in said latched position thereof engaging means on said cam plate means to position said cam plate means in a first angular position relative to said support plate means against the bias of said cam plate biasing means, said keeper means in said released position thereof disengaging said means on said am plate means, whereby said cam plate biasing means displaces said cam plate means to a second angular position relative to said support plate means, and actuator means on said support plate means for controlling pivotal displacement of said keeper means from said latched to said released position thereof, said actuator means being positioned for engagement by a work piece moving relative to said die head in the direction from said entrance toward said exit end.

An annular thread cutting die head for a power driven threading machine, said die head having a die head axis and an entrance end and an exit exit end and comprising, a plurality of thread cutting dies, annular support plate means coaxial with said die head axis and supporting said cutting dies for displacement radially inwardly and outwardly of said die head axis, annular cam plate means coaxial with said support plate means and interengaged therewith for relative pivotal displacement in opposite directions about said die head axis, said cam plate means including means to displace said cutting dies radially inwardly and outwardly relative to said die head axis in response to said pivotal displacement in opposite directions thereabout, cam plate biasing means biasing said cam plate means to pivot about said die head axis in the direction to displace said cutting dies radially outwardly thereof, keeper means mounted on said support plate means for pivotal displacement between latched and released positions about a keeper axis parallel to said die head axis, keeper track means on said cam plate means, said keeper means in said latched position thereof engaging said keeper track means to position said cam plate means in a first angular position relative to said support plate means against the bias of said am plate biasing means, said keeper means in said released position thereof disengaging said keeper track means, whereby said cam plate biasing means displaces said cam plate means to a second angular position relative to said support plate means, lever means mounted on said support plate means for pivotal displacement between first and second positions about a lever axis transverse to said die head axis, said lever mean sin said first position thereof being in the path of a workpiece moving relative to said die head in the direction from said entrance end toward said exit end and being displaced by said workpiece toward said second position of said lever means, and said lever means and said keeper means including interengaging means, whereby said lever means controls displacement of said keeper means from said latched to said released position thereof as said lever means is displaced from said first to said second position thereof.

Dependencies are inferred from the claim text.