Title:
SCREW STRUCTURE OF TUBULAR CONNECTING SECTION
Document Type and Number:
Japanese Patent JPS60157583
Kind Code:
A
Abstract:
A thread form is shown for a tubular connection of the type having a pin member (13) adapted to be made up with a box member (15) to form a pipe joint. The pin member (13) has pin threads with thread crests (17) and thread roots (19) which are adapted to be made up with a mating box member (15) having a complimentary thread structure. The pin thread crests (17) are formed between a stab flank (25) and a load flank (27) of the pin thread. The pin thread has a chevron-shaped load flank (27) for engaging a mating chevron-shaped load flank of the complimentary box member (15) to provide a chevron type interfit between the load bearing flanks. The load flanks (43) of the pin member includes an outer wall portion (43) with a positive slope which provides additional clearance between the complimentary threads on the pin (13) and box members (15) during disassembly to prevent inadvertent hanging-up of the threads.
Inventors:
TOOMASU ERU BUROOZU
Application Number:
JP27273084A
Publication Date:
August 17, 1985
Filing Date:
December 24, 1984
Export Citation:
Assignee:
CHIYUUBURAA CORP OBU AMERIKA I
International Classes:
E21B17/042; F16B33/02; F16L15/06; F16L15/00; (IPC1-7): E21B17/042; F16B33/02; F16L15/00
Domestic Patent References:
| JPS5314411A | 1978-02-09 | |||
| JPS52148828A | 1977-12-10 | |||
| JPS4951621A | 1974-05-20 |
Attorney, Agent or Firm:
Akashi Masatake