Two-stroke machine for making buttons having coplanar shell flanges
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United States of America Patent
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Sep 6, 2005
Grant Date -
N/A
app pub date -
Jan 14, 2003
filing date -
Jan 14, 2003
priority date (Note) -
In Force
status (Latency Note)
Importance
Abstract
A machine manufactures buttons having coplanar shell flanges in a two-stroke operation. The machine comprises a crimp die having different resistances to advancement of a ram. The first resistance enables a metal shell margin to partially bend under a flat back that is placed on a first surface of the crimp die. The second resistance enables the shell wall to completely bend against a second surface of the crimp die so as to form flanges that lie in a single plane. Both round and rectangular buttons are manufacturable using the same basic machine. The rectangular machine uses a shifter cage on the ram that rotates in response to indexing a die table on which the crimp die and a pickup die are attached. The round machine uses a rotatable frame on the ram. With the rectangular machine, the shell is initially bent during a pickup stroke of the ram.
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