公开(公告)号：US5671961A

公开(公告)日：1997-09-30

申请号：US542780

申请日：1995-10-13

Applicant: David A. Buck

Inventor： David A. Buck

IPC: B25B5/14 ,  E21B19/16 ,  B66C1/62 ,  B25B13/48

CPC classification number: B25B5/147 ,  E21B19/163

Abstract: Present invention provides back-up power tongs for holding a tubular member against rotation of a connected tubular member. The back-up power tongs comprise a body with a front section for receiving the tubular member and a plurality of jaw members for engaging the tubular member. The jaw members are positioned to form a substantially closed perimeter around the tubular member and at least one of the jaw members is a pivotal jaw, moving in a pivotal path to engage the tubular member. An alternate embodiment provides two pivoting jaws and a locking mechanism attached to the end of the pivoting jaws such that the pivoting jaws can be securely interlocked. The improved back-up tongs should not require that the tong body to virtually enclose the pipe and thus will allow the improved back-up tongs to be considerably smaller. The smaller size of the tongs will allow more versatile use since the tongs can operate in areas with less clearance than prior art tongs. The improved back-up tongs should also be less costly as they will require a considerably smaller amount of material to construct. Additionally, the improved back-up power tongs will be adaptable to many uses other than breaking pipe in conjunction with conventional power tongs. The present invention also may have application as a gripping device positioned on cranes or other lifting apparatus.

Abstract translation: 本发明提供了用于保持管状构件抵抗连接的管状构件的旋转的备用动力钳。 备用动力钳包括具有用于接收管状构件的前部的主体和用于接合管状构件的多个钳口构件。 钳口构件被定位成围绕管状构件形成基本上封闭的周边，并且至少一个钳口构件是枢转钳口，其在枢转路径中移动以接合管状构件。 一个替代实施例提供了两个枢转夹爪和一个连接到枢转爪的端部的锁定机构，使得枢转爪可以牢固地互锁。 改进的后备钳不应要求钳体实际上封闭管道，从而允许改进的备用钳相当小。 钳子的较小尺寸将允许更多功能的使用，因为钳子可以在比现有技术钳子更小的间隙的区域中操作。 改进的后备钳也应该较低成本，因为它们将需要相当少量的材料来构造。 此外，改进的备用动力钳将适用于与常规动力钳一起断裂管以外的许多用途。 本发明还可以用作定位在起重机或其他提升装置上的夹紧装置。

公开(公告)号：US5291808A

公开(公告)日：1994-03-08

申请号：US910703

申请日：1992-07-08

Applicant: David A. Buck

Inventor： David A. Buck

IPC: B25B13/44 ,  B25B13/50 ,  E21B19/16 ,  B25B21/00

CPC classification number: E21B19/164 ,  B25B13/44 ,  B25B13/5075

Abstract: A camming member for power tongs, comprising a ring-shaped body including a central opening formed therein, the body being rotatable about a point within the central opening, the body further including a slot, the slot opening through the body and communicating with the central opening; a ring-shaped drive member including a central opening formed therein, the drive member being rotatable about the point, the drive member further including a slot, the slot opening through the drive member and communicating with the central opening of the drive member, the slot of the drive member being alignable with the slot of the body, the drive member being slidably mounted on the body such that the drive member may rotate independently of the body and such that the drive member is radially supported by the body; and a detent and stop mechanism, mounted on the camming member, for allowing the body and the drive member to partially rotate relative to one another to a desired engaged position and then to maintain the engaged position as the camming member rotates. Additionally, a the body of the camming member may also have a first cam surface facing the central opening and curving inward toward the point, and a second cam surface facing the central opening and curving inward toward the point, at least a portion of the second cam surface being axially aligned with and offset from the first cam surface.

Abstract translation: 一种用于动力钳的凸轮构件，包括环形主体，其包括形成在其中的中心开口，所述主体可围绕中心开口内的点旋转，所述主体还包括狭槽，所述狭槽开口穿过所述主体并与所述中心 开口 环形驱动构件，其包括形成在其中的中心开口，所述驱动构件可绕所述点旋转，所述驱动构件还包括槽，所述槽开口穿过所述驱动构件并与所述驱动构件的中心开口连通，所述槽 所述驱动构件可与所述主体的狭槽对准，所述驱动构件可滑动地安装在所述主体上，使得所述驱动构件可以独立于所述主体旋转并且使得所述驱动构件由所述主体径向支撑; 以及安装在凸轮构件上的止动和停止机构，用于允许主体和驱动构件相对于彼此部分地旋转到期望的接合位置，然后在凸轮构件旋转时保持接合位置。 此外，凸轮构件的主体还可以具有面向中心开口并朝向该点向内弯曲的第一凸轮表面，以及面向中心开口并朝向该点向内弯曲的第二凸轮表面，第二凸轮表面的至少一部分 凸轮表面与第一凸轮表面轴向对准并偏移。

公开(公告)号：US4709599A

公开(公告)日：1987-12-01

申请号：US813516

申请日：1985-12-26

Applicant: David A. Buck

Inventor： David A. Buck

IPC: E21B19/16 ,  B25B17/00

CPC classification number: E21B19/164

Abstract: A pipe die linkage for power tongs has a preloaded spring between a force producing cam follower and pipe die of such strength and preload that the die serrations will be forced to adequately bite into the pipe. Bias resisted overtravel will prevent pipe crushing at high torque levels, as the cam follower is forced more toward the pipe.

Abstract translation: 用于动力钳的管模连接件具有在力产生凸轮从动件和管模之间的预加载弹簧，其具有这样的强度和预加载力，即模具锯齿将被迫使其适当地咬入管中。 由于凸轮从动件被迫更多地朝向管道，偏压阻力超程将防止在高扭矩水平下的管道破碎。