专利名称：Breakable composite drill screw 发明人：Katsumi Shinjo
广告分类申请号：US07/430845
申请日：19891101
公开号：US04958972A
技术预见公开日：
交相辉映
姐妹节
玫瑰姑娘19900925
毫猪专利内容由知识产权出版社提供
摘要：A breakable composite drill screw compris a first shank made of a metal unsusceptible of hardening, a driving head extending from one end of the first shank and engageable with a screw driving tool, a cond shank made of another metal susceptible of hardening, the cond shank being fixedly adjoined to the other end of the first shank to thereby provide a break zone at said other end, a drill bit formed by cold forging at an end of the cond shank, a continuous thread formed by thread-rolling to extend around both outer cylindrical peripheries of the first and cond shank wherein a portion extending from the break zone to the drill bit is hardened or quenched, and wherein said shanks are adjoined at their engaging surfaces to each other by projection-welding technique making u of a welding lug protruding from either engaging surface, said lug forming the break zone.
申请人：YUGEN KAISHA SHINJOSEISAKUSHO夜色浸霜
我是真的后悔
代理机构：Jordan and Hamburg
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