Threading machine die head

Details Threading machine die head Threading machine die head

1992-05-06

1993-04-06

Larson, Lowell A.

Threaded, headed fastener, or washer making: process and apparat

Apparatus for making externally threaded fastener or...

Screw fastener making

408 73, 408 15, 470 73, 470 77, B21H 302

Patent

active

051999285

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.

REFERENCES:
patent: 3820180 (1974-06-01), Birkestrand et al.
patent: 3864774 (1975-02-01), Fohl
patent: 4288181 (1981-09-01), Sakaguchi et al.
patent: 4329098 (1982-05-01), Maruyama
patent: 4370770 (1983-02-01), Wagner
patent: 4396316 (1983-08-01), Sakaguchi et al.
patent: 4880340 (1989-11-01), Taki et al.

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