Drill pipe assembly for counterbore tool - comprises an outer pipe contg. 2 inner pipes forming a connecting piece with a socket end and a plug end
Номер патента: DE4018842C1
Опубликовано: 04-07-1991
Автор(ы): Siegfried 5883 Kirspe De Treitz
Принадлежит: Komotzki, Michael, 4708 Kamen, De, Treitz, Siegfried, 5883 Kierspe, De
Опубликовано: 04-07-1991
Автор(ы): Siegfried 5883 Kirspe De Treitz
Принадлежит: Komotzki, Michael, 4708 Kamen, De, Treitz, Siegfried, 5883 Kierspe, De
Реферат: Drill pipe assembly has two lengthwise sections consisting of an outer pipe inside which are two inner pipes. A connecting piece formed by two inner-pipe parts has a socket end and a plug end to take, respectively, another plug end and socket end. Each inner pipe is securely connected to the outer pipe at the end of a pipe section, and is supported at the end of the other section by a socket. Variants claimed include the arrangement having more than two inner pipes. USE/ADVANTAGE - The parts can be safely assembled, i.e. without the risk of damage to which other arrangements are liable, and provides for longitudinal thermal expansion.
Dual-wall drill pipe
Номер патента: US4565394A. Автор: Floyd W. Becker. Владелец: Individual. Дата публикации: 1986-01-21.