专利名称：Swivel unit
发明人：Lawrence E. Helzer 申请号：US06/273821
申请日：19810615
公开号：US04395061A
公开日：
社会规律
19830726
太极养生专利内容由知识产权出版社提供市场渗透战略
生物的性状
涉密会议
摘要：A swivel unit for inflatable packer drill stem test tools has an outer housing with a lower end adapted for connection to the drill stem and an upper end. An inner shaft has a ba portion received within the outer housing and has a neck portion which protrudes from the outer housing. Tapered roller bearings located between the outer housing and inner shaft at opposing ends of the inner shaft ba portion rotatably mount the outer housing about the inner shaft. The outer housing has a shoulder formed in its external surface for receiving the derrick elevators and supporting the test tool asmbly.
申请人：HUGHES TOOL COMPANY
米酒鸡蛋下奶吗代理人：Robert A. Felsman,Charles D. Gunter, Jr.
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