电脑锁屏怎么解除专利名称：POWER TONG
发明人：MCDANIELS, Gary, D.,CUMMINGS, Patrick,
D.,HAYES, Michael, W.,ALBRIGHT, Stephen, L.申请号：EP98902096.0
申请日：19980129
廉洁齐家公开号：EP0963503A1
公开日：
鲁东大学排名19991215
专利内容由知识产权出版社提供
科目二s弯道技巧摘要：A new power tong for rotating tubular members for make-up (connection) and break-out (disconnection) operations. In one aspect such a tong has at least one movable jaw with a smooth surface gripping element thereon and pre-load apparatus for applying a pre-load force to a movable jaw so that the jaw does not slip on a tubular to be rotated and so it does not mark or damage the tubular. In one aspect the pre- load apparatus includes a first pre-load device at one end of a movable jaw for breakout operations and a cond pre-load device at another end of the jaw for make-up operations. In one aspect a power tong which has unique smooth surfaced jaw inrts made, e.g., of aluminum. In one aspect a single pivotable pre-load cylinder, fixed to rotary, pivots for pivotable connection to one jaw or the other. This can be done manually or a powered smaller piston/cylinder may be ud to pivot the pre-load cylinder. In one aspect a jaw unit which compris a jaw holder and a jaw movable with respect to said jaw holder, characterized in that said jaw is slidably mounted on said jaw holder.妒妇津
盈亏问题公式申请人：Weatherford/Lamb Inc.
地址：CSC - The United States Corporation Company, 1013 Centre Road Wilmington, DE 19805 US
国籍：US江苏大学法学院
愿意的反义词
代理机构：Asquith, Julian Peter, et al 更多信息请下载全文后查看
