Gaiatsu of the excellent oil well pipe fittings

摘要

(57) Abstract Objective Resistance external pressure Characteristic is made satisfactory. Constitution The box which possesses female screw 1a in the Tip inner skinIn 1 and the Tip side peripheral face the male screw which in aforementioned female screw 1the spiral shellfish is adjustedThe pin 2 which possesses 2a and the fitting smell for the oil well pipe of consisting ofFrom male screw 2of a te and pin 2 on Tip side, extension 2d and,The crevice 2 where the surface goes down to the thickness direction and possesses the inclination of gradientContinuing the tilt slant face 2c of b and necessary going down gradient, it formsru. From female screw 1of a box 1 to inner, at the time of spiral shellfish tightening,Similar with extension 2d of pin 2 oil reservoir section 3 is formedThe going down which is fitted to the upper tilt slant face of extension 1b and crevice 2bThe tilt slant face of convex section 1c and the going down gradient which possess the tilt slant face of gradientContinuing the tilt slant face 1d of the same going down gradient which fits with 2cIt forms. Female screw 1a in this the spiral shellfish between male screw 2a which is adjusted0 it forms the gap of the screw thread over screw total length.