According to an embodiment of the present invention, provided is a closing structure of a pressure-resistant container in which an opening of a metallic cylindrical container is closed by a metallic closing member, the closing member including a closing part, the closing part including a first surface, a second surface on an opposite side to the first surface in a thickness direction, and a circumferential surface part between the first surface and the second surface, and having a same shape as that of the opening and having a size enabling insertion thereof into the opening. The closing structure includes: the closing member that is inserted to be at an inside of the opening of the cylindrical container, with the second surface facing inside of the cylindrical container; an annular deformed part that is deformed, with a peripheral wall part on the opening of the cylindrical container abutting against the first surface of the closing part of the closing member and a first annular corner part at a boundary between the first surface and the circumferential surface part; and a welded part where a contact portion between the first annular corner part of the closing part of the closing member and the annular deformed part is welded from outside.

A ring and method of manufacturing a ring which may include: an outer ring, in which a second carbide composed of a combination of tungsten carbide, iron group carbide or carbonitride is mixed with a metal binder phase at a predetermined ratio, in which the outer ring is divided into a first outer ring and a second outer ring formed in a shape corresponding to each other; an inner ring separately and/or independently assembled between the first and second outer rings, in which the inner ring includes an outside inner ring that forms an outer circumferential surface of the ring and an inside inner ring that forms an inner circumferential surface of the ring; ring fitting parts formed on the first and second outer rings, respectively, such that both sides of the outer and inside inner rings are press-fit; and assembling protrusions formed on the first and second outer rings, respectively, to be inserted into the outer circumferential surface of the inside inner ring to maintain a firm assembly between the outer ring and the inner ring for a long period of time.

The invention relates to a lifting bellows (1), for example for axle-lifting apparatuses of vehicles. The invention is based on the object of creating a lifting bellows (1) which is lightweight and of simple construction and which can be produced inexpensively. The object is achieved by virtue of the fact that the lifting bellows (1) has at least one hose-shaped elastomer main body (2) with an elastomer matrix and has reinforcing supports (6, 7) embedded in the elastomer matrix, two end covers (3, 3A) and two clamping elements (4), wherein the reinforcing support (6, 7) of the main body (2) is built up from at least two thread plies (6, 7), wherein each thread ply (6, 7) is arranged, in the non-loaded state, at a winding angle (11A, 11B) with respect to the circumferential direction, the absolute value of which winding angle (11A, 11B) is less than 35.3, wherein the two winding angles (11A, 11B) have virtually the same absolute value but different signs, and that the end covers (3, 3A) are each connected at both ends to the main body (2) in an air-tight fashion by means of the clamping elements (4).

Provided is a tank cooling device that is capable of cooling a tank more quickly. A tank cooling device 4 has a nozzle 40. The nozzle 40 is comprised to supply cooling gas for cooling a tank 100 to an outer surface of the tank 100, with the cooling gas assisted by compressed gas in the nozzle 40. The tank 100 has a tank main body 101 made by using synthetic resin and an end member 102 made by using metal. The nozzle 40 supplies a gas flow to each of the tank main body 101 and the end member 102.

Provided is a tank cooling device that is capable of cooling a tank more quickly. A tank cooling device 4 has a nozzle 40. The nozzle 40 is comprised to supply cooling gas for cooling a tank 100 to an outer surface of the tank 100, with the cooling gas assisted by compressed gas in the nozzle 40. The tank 100 has a tank main body 101 made by using synthetic resin and an end member 102 made by using metal. The nozzle 40 supplies a gas flow to each of the tank main body 101 and the end member 102.

A device for attaching a mouthpiece to an innerliner of an aircraft water tank is provided. A cylinder portion of an innerliner is thermally deformed to conform to an inner circumferential portion of a cylinder-like portion, and an inner circumferential portion of a dome portion of the innerliner is attached to a skirt portion by an adhesive. A lower mold includes two sections inserted inside the innerliner from the inner side of a mouthpiece in a folded state. The two sections are opened inside the innerliner and a holding member holds the two sections in an open state. The lower mold can be disposed in the innerliner sealed from the inner side of the mouthpiece, and abutment of an outer abutting surface of an upper mold against a first annular surface and abutment of an inner abutting surface of the lower mold against a second annular surface can be performed.

A method for producing a high-pressure tank that can, when forming a reinforcement layer following a previous reinforcement layer using fiber bundles, ensure the strength of the tank by reducing disturbance of the orientation of the fiber bundles. The method is adapted to form each reinforcement layer by winding fiber bundles while holding a preset tension for each layer, and includes a winding start step of stopping rotation of the tank liner upon completion of formation of at least one of the reinforcement layers, and, at the start of forming a following reinforcement layer, winding the fiber bundles at a tension smaller than a preset tension for the following reinforcement layer while alternately repeating rotation of the tank liner in the forward direction and the reverse direction, thereby forming a winding start portion of the following reinforcement layer; and a main winding step of winding the fiber bundles at the preset tension after the winding start step, so as to complete the formation of the following reinforcement layer.

A method for producing a high-pressure tank that can, when forming a reinforcement layer following a previous reinforcement layer using fiber bundles, ensure the strength of the tank by reducing disturbance of the orientation of the fiber bundles. The method is adapted to form each reinforcement layer by winding fiber bundles while holding a preset tension for each layer, and includes a winding start step of stopping rotation of the tank liner upon completion of formation of at least one of the reinforcement layers, and, at the start of forming a following reinforcement layer, winding the fiber bundles at a tension smaller than a preset tension for the following reinforcement layer while alternately repeating rotation of the tank liner in the forward direction and the reverse direction, thereby forming a winding start portion of the following reinforcement layer; and a main winding step of winding the fiber bundles at the preset tension after the winding start step, so as to complete the formation of the following reinforcement layer.

A fiber structure that includes a liner, and a fiber reinforcement base material formed of a fabric. The fiber reinforcement base material externally covers a body portion and a dome-shaped portion of the liner, and includes first yarns and second yarns. The first yarns are arranged such that a direction in which a yarn main axis of each of the first yarns in the body portion and the dome-shaped portion proceeds is a circumferential direction of the liner. The second yarns are arranged such that a direction in which a yarn main axis of each of the second yarns in the body portion proceeds is an axial direction of the body portion and that a direction in which a yarn main axis of a portion of each of the second yarns arranged in the dome-shaped portion proceeds is an axial direction of the dome-shaped portion.

An object of the present invention is to provide a pressure vessel that is light in weight and has a sufficient internal capacity as well as excellent durability. The present invention provides a pressure vessel (1) including: a cylindrical straight body section (10) and dome sections (11) provided at both ends of the body section (10), wherein: the body section (10) and the dome sections (11) are composed of a resin main body (2), and an outer shell (3) made of a fiber reinforced resin material, the outer shell (3) being provided on the outside of the main body (2); each of dome sections (2b) of the main body (2) has pinch-off regions (12) extending from a tip of the dome section (2b) toward the body section (2a); and when a distance from the tip of each of the dome sections (2b) to a boundary between the body section (2a) of the main body (2) and each of the dome sections (2b) in an axial direction of the body section (2a) is 1, an end (12a) of each of the pinch-off regions (12) opposite to the tip of the dome section (2b) is located in a region where an distance from the tip of the dome section (2b) in the axial direction of the body section (2a) is less than 1.