Patent ID: 9539697
Date: 2017-01-10
CPC Classifications: B21H,B23G,B23P,B24B,Y10T

Claim:
1. A device for root-rolling a thread on an object with controllable force along the entire length of said thread, comprising: a body having a passageway, and having a cylindrical opening communicating with said passageway; an accumulator piston mounted on said body for sealed sliding movement within said passageway; a coarse adjustment screw threadedly mounted on said body; a resilient member acting between said coarse adjustment screw and said accumulator piston; an actuator piston mounted on said body for sealed sliding movement within said cylindrical opening, a chamber being defined within said passageway between said accumulator piston and said actuator piston, said actuator piston having a proximal end facing into said chamber and having a distal end; a thread roll rotatably mounted on said actuator piston adjacent said distal end; said body having a first opening communicating with said chamber; a fine adjustment screw threadedly mounted on said body in said first opening; wherein said chamber is completely filled with liquid; wherein the positions of at least one of said coarse and fine adjustment screws relative to said body may be selectively adjusted to controllably vary the fluid pressure within said chamber; wherein said thread roll has an asymmetric configuration; wherein said actuator piston has a pocket adapted to receive said thread roll; and wherein said pocket has an asymmetric configuration complementary to the asymmetric configuration of said thread roll such that said thread roll may only be inserted into said pocket when said thread roll is in said proper orientation relative to said actuator piston; whereby said device may be mounted on a machine tool and selectively moved toward said object to root-roll a thread on said object with controllable force along the entire length of said thread when said object and device are rotated relative to one another.