Abstract: A gasket that, when it is tightened from both sides by flanges etc., elastically deforms to produce reaction force acting against the tightening force, achieving improved sealing ability, and that is manufacturable at low cost by press working. One or more first annular curved ridges (12, 13) are formed on one side of a plate body (27) having a round hole (11) at its center and formed of an elastic material, and annular curved grooves (14, 15) are formed on the other side, at portions corresponding to the first annular curved ridges (12, 13). One or more second annular curved ridges (16) are formed on the other side, at positions not superposed on the first annular curved ridges (12, 13), and annular curved grooves (17) are formed on the one side, at positions corresponding to the second annular curved ridges (16). Elastically deformable annular connection sections (18, 19) are formed between the first annular curved ridges (12, 13) and the second annular curved ridges (16).

Abstract: A drive power apparatus utilizing winds is disclosed. A vertical shaft 12 disposed vertically and rotatably, a rotatable horizontal shaft 16-18 rotatably perpendicularly penetrating the vertical shaft 12, a first and a second plate-like blade members 19 to 24 provided on the horizontal shaft 16 to 18 on the opposite sides of the vertical shaft 12 and a drive power mechanism 21 operable with the rotation of the vertical shaft 12 are provided. The first and second blade members 19 to 24 are secured to the horizontal shaft 12 such that their plane orientations are deviated from each other by an angle of 90 degrees in the peripheral direction of the horizontal shaft 12, and are rocked about the horizontal shaft 12 in an interlocked relation to each other between the vertical and horizontal directions.

Abstract: A nut body 11 having a central female thread 12 also has a first and a second slit 13 and 14 formed to partly penetrate the internal female thread from the opposite sides. The distance b between the bottoms of the first and second slits 13 and 14 is in a range of 0.15 to 0.8 times the nominal diameter d. A first and a second push part 15 and 16 which are formed in an upper part of the nut body 11 by the first and second slits 13 and 14 bent downward by plastic deformation.

Abstract: A bolt according to the invention comprises: a coarse screw thread portion of pitch P, which is formed from the tip end portion of a bolt shank to a prescribed portion; and a fine screw thread portion of pitch p (p=P/n wherein n is an integer of 2 or more), which is formed so as to overlap the coarse screw thread portion for at least the entire length of the coarse screw thread portion of the bolt shank or from the tip end portion to the prescribed portion of the coarse screw thread portion. And, it is an object of the invention to provide a bolt that can be mass-produced at low cost, bring about excellent synchronicity, strength against compression and shear, and an excellent tightening force, and in which a nut screwed therein is scarcely loosened upon receiving a large vibration load.

Abstract: The invention provides a structure of a loosening-stop tightening means, a loosening-stop bolt having the structure, a method for producing the same bolt, a loosening-stop nut having the structure, and a method for producing the same nut, by which the screwing force can be prevented from being lowered when an external force is applied to a member to be tightened and a screw thread, etc.

Abstract: There is provided a sealing structure including a body portion having an outer surface at which the body portion is kept in contact with an opponent part, the body being formed with a bore therethrough, the body portion being formed at the outer surface thereof with at least one annular projection or recess designed to be swingable in a direction in which the bore extends. Since the annular projection or recess is designed to be swingable, when the body portion is connected to an opponent part through the outer surface thereof, the outer surface can be deformed, resulting in ensuring quite high sealing between the body portion and the opponent part.