Abstract: A linkage assembly for a vibratory plow. A vibratory plow comprises a power unit and a vibratory plow assembly. The vibratory plow assembly has a linkage assembly to connect to the power unit. The linkage assembly comprises a lift trolley, an upper arm, a lower arm and a load transfer link. The upper arm is pivotally connected to an upper end of the lift trolley. The lower arm is pivotally connected to a lower end of the lift trolley. A vibrator assembly is connected to the upper arm and the lower arm and a plow assembly comprising a plow blade is connected to the vibrator assembly. The load transfer link is operatively connected to the upper arm and to the vibrator. The load transfer link may be a leaf spring with an intermediate link. Alternatively, the load transfer link may be a hydraulic cylinder or an elastomeric member.

Abstract: A linkage assembly for a vibratory plow. A vibratory plow comprises a power unit and a vibratory plow assembly. The vibratory plow assembly has a linkage assembly to connect to the power unit. The linkage assembly comprises a lift trolley, an upper arm, a lower arm and a load transfer link. The upper arm is pivotally connected to an upper end of the lift trolley. The lower arm is pivotally connected to a lower end of the lift trolley. A vibrator assembly is connected to the upper arm and the lower arm and a plow assembly comprising a plow blade is connected to the vibrator assembly. The load transfer link is operatively connected to the upper arm and to the vibrator. The load transfer link may be a leaf spring with an intermediate link. Alternatively, the load transfer link may be a hydraulic cylinder or an elastomeric member.

Abstract: A drill pipe with cold upset ends. The drill pipe includes an elongate tubular portion with a pin joint on one end and a box joint on the other end. Each of the ends of the tubular portion is expanded using a cold upsetting process to provide a transitional portion and a joint receiving portion. The ends of the tubular portion have an inner and outer diameter which is greater than the inner and outer diameter of the tubular portion. The wall thickness of the tubular portion is substantially the same throughout its entire length, including the transitional portions and the joint receiving portions. A drill pipe made in accordance with this invention is durable and less costly to manufacture. A cold upsetting method by which the drill pipe is made utilizes no external heat. An internal mandrel is first inserted hydraulically into the ends of a tubular steel shaft to enlarge the ends.

Abstract: A cutting chain is provided which includes facing inner side bars (12) and outside members (14) which have substantially the same height. Further, the leading inner ends of the inner side bars (12) and the trailing inner end of the outside members (14) have a reduced radius to increase wear life while giving the chain a preferred direction of travel.

Abstract: A multiport piggable fluid-swivel comprising a first member having a first face, a second member having a second face adjoining and mating with the first face of the first member, the first face and the second face being positioned to rotate relative to each other about a common axis, a fluid conduit defined by a first raceway in the first face and a second raceway in the second face opposite the first raceway, an inlet conduit communicating with the fluid conduit and directed thereto at an angle so as to permit a pipeline pig to travel from the inlet conduit to the fluid conduit, an outlet conduit communicating with the fluid conduit, and a pipeline pig guide means extending from the fluid conduit to the outlet conduit to direct a pipeline pig from the fluid conduit to the outlet conduit.