Claims
- 1. The combination of a stripper device with a die for forming a hole in a workpiece comprising:
- a frame including a surface for supporting a workpiece and a ram movable to and from said surface;
- a hollow bushing fixedly mounted to said frame;
- a punch fixedly mounted to said frame and sized to force a portion of said workpiece in said bushing when said ram moves toward said surface;
- a stripper rod mounted to said frame and being positioned within said bushing;
- spring means engaged with said frame and said rod being operable to urge said rod through said bushing to force said portion of said workpiece therefrom as said ram moves away from said surface but being yieldable to allow said rod to withdraw within said bushing as said portion of said workpiece is forced into said bushing by said punch;
- a plurality of punches mounted to said frame in a row with said punches arranged with decreasing diameters in said row;
- a plurality of bushings mounted to said frame in a row opposite said punches with said bushings arranged with decreasing internal diameters to cooperatively with said punches form a bonnet in said workpiece of decreasing diamater as said bonnet is moved along said row and engaged successively by some of said punches and bushings;
- a hollow pierce bushing mounted to said frame;
- a pierce punch mounted to said frame being extendable through said workpiece and into said pierce bushing;
- a stripper bushing slidably disposed around and encircling said pierce punch;
- spring means engaged with said frame and said stripper bushing being operable to force said workpiece from said pierce punch as said pierce punch is withdrawn from said workpiece.
Parent Case Info
This is a division of application Ser. No. 623,101 filed Oct. 16, 1975 now U.S. Pat. No. 3995,469.
US Referenced Citations (8)
Divisions (1)
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Number |
Date |
Country |
Parent |
623101 |
Oct 1975 |
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