| 发明名称 |
Reinforced plastic retainer rings for sheet metal forming and method of making |
| 摘要 |
A reinforced plastic retainer ring for use in a sheet metal stretch forming process. The ring is reinforced with a plurality of metal brackets embedded in the rim portion generally radially aligned toward the center of the ring.
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| 申请公布号 |
US4719786(A) |
申请公布日期 |
1988.01.19 |
| 申请号 |
US19860864317 |
申请日期 |
1986.05.19 |
| 申请人 |
GENERAL MOTORS CORPORATION |
发明人 |
MARTELL, WILLIAM A. |
| 分类号 |
B21D25/02;B21D37/10;B29C33/12;B29C39/10;(IPC1-7):B21D11/02;B29C33/40 |
主分类号 |
B21D25/02 |
| 代理机构 |
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代理人 |
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| 主权项 |
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| 地址 |
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