专利名称：Reduced-friction thread forming or thread cutting screw
发明人：Donald R. Hurdle用嘴吹
申请号：US08/644954
男性心理学申请日：19960513
公开号：US05795120A高兴的英语
公开日：
19980818自由的含义
专利内容由知识产权出版社提供
摘要：A screw or tap for forming or cutting threads in a workpiece. The screw includes a cylindrical shank directed along a longitudinal axis. The shank includes a work holding portion having a plurality of helical threads of a constant crest diameter, a constant root diameter, a constant pitch diameter, and circular cross-ction. The shank also has a lead portion having at least a portion of a helical thread. Intermediate the work holding portion and the lead portion is a forming portion. The forming portion has at least one full thread located thereon having a crest diameter which is greater than the crest diameter of the plurality of helical threads on the holding portion, a root diameter which is larger than the root diameter of the plurality of helical threads on the holding portion, and a pitch diameter which is proportionally greater than the pitch diameter of the holding portion. A coupler is located at the cond end of the cylindrical shank for accepting or coupling with a driving tool such as a screwdriver. The screw may be designed to form threads, in which ca the one full thread on the forming portion is lobular-shaped and has a lobular profile which is greater that the constant profile of the threads on the holding portion. When designed to cut threads, the screw has at least one groove formed in the shank which has a cutting edge and extends through the forming
thread on the forming portion.
电力的英文
申请人：HURDLE; DONALD R.
上帝造物代理机构：Godfrey & Kahn, S
工作目标和计划
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