Jfe Steel Corporation

Tachi-s Co., Ltd.

Toyo Tire & Rubber Co., Ltd.

Bridgestone Corporation

Jun Takano

Masaki Yoshikawa

Takamasa Kawai

Takuya Nagahama

Kazunari Takahashi

Masateru Ueta

Hiroshi Chikatsune

Tsuyoshi Yoneyama

Haruhiko Seki

Junpei Yoshikawa

Osamu Sonobe

Hideo Sato

Shogo Suzuki

Taro Kanayama

Manabu Mogi

Yu Sasaki

Kazuo Noguchi

Kenji Kumagai

Kazuyoshi Arata

Hideo Tobata

Nobuhiko Morioka

A screw joint in which an efficient screw length of a joint portion is achieved. This screw joint is for an oil well pipe of an integral type and includes: (i) a pin that is provided with a male screw portion which is a male taper screw, at one end of a steel pipe; and (ii) a box that is provided with a female screw portion which is a female taper screw fitted to the male screw portion, at one end of the steel pipe, in which a structure, in which the pin and the box are in metal contact with each other to seal a fluid, is provided at least at one place of a seal portion on an outer peripheral surface side of a pipe end side of the pin and a seal portion on an inner peripheral surface side of a pipe end side of the box.

Screw joint for oil well pipe

A vehicle seat, wherein in order to ensure that air reliably flows through the entire sir channel formed on the seat obverse surface side when a blower on the seat reverse surface side is operated while an occupant is seated on the seat, a hole part passing from the surface on the side for seating the occupant through to the surface on the opposite side from the surface on the side for seating the occupant is formed through each urethane pad in a seat back and a seat cushion of the vehicle seat, the interiors of the hole parts formed in the urethane pads are filled with a material that is more breathable than the urethane pads, a plurality of grooves extending from the hole parts are formed on the surface of each of the urethane pads on the side for seating the occupant, and a blower for discharging or intaking air from the surface of each of the urethane pads on the side for seating the occupant through the hole parts filled with the breathable material is provided on the surface of each of the urethane pads on the side opposite the side for seating the occupant.

Vehicle seat

A threaded joint for oil well steel pipe is provided. The threaded joint includes a pin provided with a male thread, and a box provided with a female thread threadedly engaged with the male thread, and at an outer periphery side sealing portion, a cross-sectional area S1 of the pin at a seal point, and a cross-sectional area S0 of a pipe body portion, which is an unprocessed pin portion, satisfy an expression (S1/S0)&#xd7;100&#x2265;15(%), at an inner periphery side sealing portion, a cross-sectional area S2 of the box at a seal point, and a cross-sectional area S0' of a pipe body portion, which is an unprocessed box portion satisfy an expression (S2/S0&#x2032;)&#xd7;100&#x2265;20(%), and a surface area S3 of a contact portion of an intermediate shoulder between thread rows and the cross-sectional area S0 satisfy the expression (S3/S0)&#xd7;100&#x2265;10(%).

Threaded joint for oil well steel pipe

A vehicle seat includes: a seating part that constitutes the vehicle seat; a support member that rotatably supports a portion of the seating part; an elastic member having a first end and a second end, the first end being attached to a movable portion of the seating part which is capable of rotating about the support member and the second end being attached to the seat frame; and an attenuation device that attenuates a motion of the movable portion when the movable portion moves from a seated state with a load applied, back to a normal state in which the applied load is removed. The movable portion of the seating part may include a base member, a slab member provided on the base member, and a surface member that covers the slab member.

Provided is a threaded joint for an oil well tubing which possesses sufficient sealability when the external pressure is applied to the threaded joint by suppressing the plastic deformation of a nose portion and sufficient galling resistance. The sufficient galling resistance is provided by preventing the occurrence of galling at the time of making up the threaded joint during verification test performed in accordance with ISO13679:2002 even when the threaded joint for an oil well tubing has a small thickness. Parameters including sizes of the threaded joint at positions of a seal point and shoulder portions satisfy formula 1 ((Ds1&#x2212;Ds0)/(D1&#x2212;D0)&#x2265;0.30), formula 2 (tan &#x3b8;&#x3e;(&#x394;D+&#x3b4;)/{2(Lt&#x2212;Ls)}), and Ls/Ln is set to 0.2 to 0.6.

Threaded joint for oil well tubing

A threaded pipe joint, when acted upon by a tensile load, does not break on the female thread-side of a first thread section of a second thread series that extends from an intermediate shoulder. The threaded pipe joint reliably undergoes tensile rupture on the female thread-side of a first thread section of a first thread series, which is the original critical cross-section site. The threaded pipe joint is configured so that when the male and female threads of the intermediate shoulder are screwed together, the load flank-side thread gaps L1G and L2G of a first thread series, which is the radially inward thread series, and a second thread series, which is the radially outward thread series, on the two sides of the intermediate shoulder always satisfy the relationship L1G&#x3c;L2G.

Threaded pipe joint

It is provided a seat pad having excellent comfort in seating with improved air permeability and cushion durability in a seat pad of the vehicle seat. The seat pad includes an air permeable member having a ventilation n function with an outside. The seat pad is integrally foam molded using a foamed resin material in a state where the air permeable member is introduced. The seat pad has a surface of the air permeable member projecting with respect to a surface of the seat pad located at a closest position to the air permeable member.

Seat pad and method for manufacturing seat pad

A threaded joint for pipes including a pin and a box, characterized in that the relationship 0.05 degrees&#x2264;&#x3b8;&#x2212;&#x3b8;&#x2264;2.0 degrees is satisfied, where &#x3b8;is an angle of an insertion surface of the female thread on the box side relative to a plane perpendicular to an axis of pipe, and &#x3b8;is an angle of an insertion surface of the male thread, which faces the insertion surface of the female thread, on the pin side relative to the plane perpendicular to the axis of pipe.

Threaded joint for pipes

A threaded joint is adapted for tubes where the stress or the strain concentration hardly occur at a threaded corner portion of box side even when the threaded joint receives repeated tensile-compressive forces or repeated bending forces. In a radial seal type threaded joint, tensile efficiency TE (%) defined by a ratio S/Sbetween a cross-sectional area S, an area of Critical Cross Section (CCS) including a portion where a tensile stress and a strain become the highest in a tube circumferential cross section of a box and a cross-sectional area Sof a tube body satisfies formula TE (%)&#x2265;2.25&#xd7;t/&#x3c1;+99.9 having a ratio t/&#x3c1; between an internal thread height t of the box and a radius of curvature &#x3c1; of a corner portion of internally-threaded bottom load surface side.

Threaded joint for tube

An air-permeable seat having a seat cushion and a seatback, each formed by mounting an urethane pad on a frame and then covering the urethane pad with an air-permeable trim cover, the air-permeable seat includes a fiber pad provided in at least one of the seat cushion and the seatback and penetrating a part of the urethane pad; a chamber defined at the back of the fiber pad, covering the fiber pad and shaped to rectify an airflow coming from the fiber pad; and air intake parts flow the air in the fiber pad and introduce the air from the fiber pad into the chamber; wherein as the air intake parts is driven, air is drawn from the surface of the fiber pad through the trim cover, flows from the fiber pad to the chamber, may be rectified in the chamber and flow out through the chamber.

Air-permeable seat and air conditioning system of seat

A threaded joint in which the outer peripheral face of the pin nose has a single tapered shape, the seal face of the box has an outwardly convex curved shape, and a seal point xdefined by equation (1) is greater than or equal to 0.2 inches, 

Threaded joint for steel pipes

In a joint for oil country tubular goods, a pitch change is made such that an internally-thread pitch has the same value as an externally-thread pitch from a thread end portion on a box end side to a pitch change position taken on a box center side with respect to a position away from the thread end portion by &#xbd; of an entire length of the threaded portion, and the internally-thread pitch is changed to a value less than the externally-thread pitch at the pitch change position so that a thread gap is gradually decreased from the pitch change position to a position of the thread end portion on the box center side, and the thread gap is eventually set to a value which is 0.2 to 0.8 times as large as the thread gap before the pitch change is made.

Threaded joint for oil country tubular goods

A tubular lower mold partitioning wall is erected on a lower mold, and a three-dimensional mesh-like body is disposed with a part of a side face exposed with respect to the lower mold partitioning wall. When a pad main body is molded by foaming a liquid raw material, the mesh-like body is penetrated through the pad main body in a thickness direction. Since the mesh-like body is disposed with a part of the side face exposed with respect to the lower mold partitioning wall, the liquid raw material is hardened between the fibers on the side face of the mesh-like body, and the side face is attached to the pad main body. Therefore, it is possible that the mesh-like body is not easily displaced with respect to the pad main body while suppressing a sweaty feeling.

Method of manufacture of seat pad

A threaded joint for an oil country tubular goods includes pins each of which occupies a pipe end portion of a steel pipe for an oil country tubular goods, and includes an externally-threaded portion, a nose extending toward a pipe end side from the externally-threaded portion, and a shoulder forming a distal end of the nose; and a box including internally-threaded portions each forming a threaded portion by being threadedly joined with the externally-threaded portion, and shoulders brought into contact with the shoulders of the pins, wherein the pins and the box being joined to each other by the threaded joining so that portions between the threaded portions and the shoulders are brought into metal-to-metal contact with each other to thereby form seal portions at the contact portions, and the shoulders of the pins and the shoulders of the box forming shoulder faces are brought into contact with each other at the time of make-up of the threaded joint, and a ratio of a chamfer length of pin thread to a thread pitch is 1.0 or more to 3.0 or less.

A premium threaded joint has a pin-side shoulder angle &#x3b8;1, a box-side shoulder angle &#x3b8;2, a seal interference quantity &#x3b4; and a seal point distance xp satisfying &#x3b8;2&#x2212;&#x3b8;1=&#x3b1;&#xd7;&#x3b4;/xp, &#x3b1;=7 to 14, and a pin distal end thickness tp1 defined by a difference Re&#x2212;Ri between a radius Re of a pin most distal end portion and an inner radius Ri of a pin distal end portion is 0.25 times or more as large as a pin raw pipe thickness tp0.

Growing community of inventors

Handa, Japan

Jun Takano