An accumulator vessel (10) includes a screwable portion (3) and a lid portion (2) that is positioned at an axially inner side of the screwable portion and an axially inner surface configures a pressure bearing plane. The lid portion includes a protruding portion (22) extending axially outward on an inner circumferential side, and the protruding portion configured to abut against an axially inner end side of the screwable portion to separate an axially inner surface of the screwable portion on an outer circumferential side thereof apart from an axially outer surface of the lid portion on an outer circumferential side thereof.

The present invention also provides a liquid reservoir assembly 10 of the type that can store and release a fluid under pressure, the assembly 10 having an outer body formed of an open ended tube 20 which is closed by end formations 70, 80 which engage respective ends of the open ended tube 20 and are held stationary with respect to the open ended tube 20, the end formations 70,80 holding between them an elongated elastic inner tube 30 sealing secured to the end formations, the elastic inner tube 30 being axially pre-tensioned or stretched from its natural or rest state, and secured to the ends in the pre-tensioned or stretched condition.

The present invention also provides a liquid reservoir assembly 10 of the type that can store and release a fluid under pressure, the assembly 10 having an outer body formed of an open ended tube 20 which is closed by end formations 70, 80 which engage respective ends of the open ended tube 20 and are held stationary with respect to the open ended tube 20, the end formations 70,80 holding between them an elongated elastic inner tube 30 sealing secured to the end formations, the elastic inner tube 30 being axially pre-tensioned or stretched from its natural or rest state, and secured to the ends in the pre-tensioned or stretched condition.

A fuel tank including a built-in component is provided. The built-in component includes: a carrier part being a rigid body including a plurality of engaging parts, and a plurality of struts each including an engageable part to be engaged with one of the engaging parts. The engageable part of the strut includes an upper contact surface and a lower contact surface, which are formed spaced apart from each other in a height direction. The engaging parts of the carrier part each includes a biasing part that, when the strut is engaged with the engaging part, enters a space between the upper contact surface and the lower contact surface and generates biasing forces in directions to move the upper contact surface and the lower contact surface away from each other.

It is possible to achieve reduction in the occurrence of tension decrease at fiber bundles in a sheet. A method of manufacturing a tank includes: a feed step of feeding a sheet including aligned fiber bundles while applying tension to the sheet in the longitudinal directions of the fiber bundles; a detection step of detecting a decreased tension part subjected to tension decrease in the sheet being fed; a tension recovery step of compensating for the tension decrease at the decreased tension part by spraying an organic solvent if the decreased tension part is detected in the detection step; and a winding step of winding the sheet having been fed on a liner.

A parallel link device whose height can be reduced particularly when a movable-side member is brought closer to a fixed-side member, and in which an amount of stroke of the movable-side member can be increased. Specifically, the parallel link device includes a fixed-side member, a movable-side member, six links, and slide mechanisms. Each of the six links has one end connected to the movable-side member with at least two rotational degrees of freedom, and the other end connected to the fixed-side member with at least two rotational degrees of freedom. A connection point of the other end and the fixed-side member is movable with respect to the fixed-side member. Each of the six links has five rotational degrees of freedom and a predetermined length. Each of the slide mechanisms is provided on the fixed-side member and holds the other end of the link movable within a predetermined range.

A tank includes a liner including an inner shell; and a reinforcing layer covering an outer surface of the liner; wherein the reinforcing layer is formed by continuously winding resin-impregnated fiber bundles around the liner, the reinforcing layer includes a hoop layer placed in a side of the liner, and a helical layer, gaps are formed between adjacent bundles of the resin-impregnated fiber bundles wound in the hoop layer, there is at least one site where the resin-impregnated fiber bundles are wound without forming a gap between adjacent bundles in the helical layer, and resin in the resin-impregnated fiber bundles has a resin toughness value of not less than 1.0 MPa.Math.m.sup.0.5.

A tank includes a liner including an inner shell; and a reinforcing layer covering an outer surface of the liner; wherein the reinforcing layer is formed by continuously winding resin-impregnated fiber bundles around the liner, the reinforcing layer includes a hoop layer placed in a side of the liner, and a helical layer, gaps are formed between adjacent bundles of the resin-impregnated fiber bundles wound in the hoop layer, there is at least one site where the resin-impregnated fiber bundles are wound without forming a gap between adjacent bundles in the helical layer, and resin in the resin-impregnated fiber bundles has a resin toughness value of not less than 1.0 MPa.Math.m.sup.0.5.

The invention relates to a reinforcing liner comprising load-bearing yarns of a first type characterized in that the liner further comprises load-bearing yarns of a second type having a creep rate {acute over ()}.sub.2 of at least 10 times higher than the creep rate {acute over ()}.sub.1 of the yarns of first type, i.e. {acute over ()}.sub.210{acute over ()}.sub.1, wherein the creep rates are measured on the yarns at a temperature of 20 C. and under an applied load of 600 MPa. The invention also relates to a pressure vessel comprising thereof.

The invention relates to a reinforcing liner comprising load-bearing yarns of a first type characterized in that the liner further comprises load-bearing yarns of a second type having a creep rate {acute over ()}.sub.2 of at least 10 times higher than the creep rate {acute over ()}.sub.1 of the yarns of first type, i.e. {acute over ()}.sub.210{acute over ()}.sub.1, wherein the creep rates are measured on the yarns at a temperature of 20 C. and under an applied load of 600 MPa. The invention also relates to a pressure vessel comprising thereof.