3,559,821 by James, entitled “Drill Pipe Handling Apparatus” and which illustrates another drill pipe handling apparatus, is additionally incorporated herein by reference.Īdditional U.S. 4,439,091 by Frias, entitled “Pipe feeding system”, the contents and teachings which are incorporated herein by reference, each illustrate carriages that move along a trough. 4,235,566 by Beeman et al, entitled “Pipe-conveying catwalk” and U.S. Hoang et al also describe pipe loading arms to assist with loading pipe into the trough. Hogan refers to these kickers as pipe ejecting assemblies that eject the pipe from the carriage using an arm and a ram, and Hoang et al refers to these as unloading arms for ejecting the pipe from the trough. 4,494,899 by Hoang et al, entitled “Pipe trough for transporting pipe between upper and lower positions”, the contents and teachings which are incorporated herein by reference, each describe automatic pipe handlers with kickers to assist with the loading and unloading of pipes. 4,386,883 by Hogan et al, entitled “Materials lifting apparatus” and U.S. Brown, the contents and teachings which are incorporated herein by reference, describe another early automatic pipe handler having an endless cable or chain driving a lug to elevate or lower a pipe in a trough to push the pipe toward the derrick. 3,916,500 entitled “Pipe handling apparatus”, each by Cicero C. 3,792,783, entitled “Pipe Handling System” and U.S. 2,643,006 by King, entitled “Automatic pipe handler,” that illustrates an early automatic pipe handler, and describes a bumper or stop having a resilient portion in the form of a rubber or spring against which the drill pipe may abut, that prevents a pipe section from sliding down the dolly. patents, the contents and teachings which are incorporated herein by reference, include: U.S. A large number of patents are exemplary of this technology, and provide the background for the basic features, while also contrasting with the novel features of the present invention. Pipe handlers are commonly used to assist with the regular raising and lowering of these very large and heavy pipes to and from an elevated drilling platform. Consequently, the handling of these large and heavy pipes is not suited to manual labor, and instead requires mechanical assistance. This means that these very large and heavy pipes must be re-oriented from horizontal to more nearly vertical orientation, and raised from near ground level to several tens of feet into the air. For exemplary and non-limiting purposes, these pipes may be stored horizontally on or near the ground adjacent to the derrick. The platform or work floor typically may be elevated many feet above the ground.ĭrill strings of very large and heavy pipes are assembled or disassembled on the derrick. These derricks facilitate the drilling and installation of wells. In the oil drilling and rigging industry, drilling platforms commonly referred to as derricks are assembled above the earth. More particularly, the present invention pertains to a pipe grabber that is used to securely retain a pipe within the pipe handler when so required or desired. This invention pertains generally to material or article handling, and more particularly to a pipe handler such as might commonly be used in the oil drilling and rigging industry and in the well servicing industry to assist with the handling of very large and heavy pipes that are regularly raised to and lowered from an elevated drilling platform. 20, 2018 of like title and inventorship, the teachings and entire contents which are incorporated herein by reference. provisional patent application 62/701,412 filed Jul. The present application claims the benefit of U.S.
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