Abstract: Provided is a manufacturing method for a compound screw having a first thread groove and a second thread groove with a different lead angle or lead direction from the first thread groove, wherein at least a portion of the first thread groove is formed by feeding a threading tool that acts on a workpiece a first feed amount toward the workpiece, the workpiece being a rotating object to be machined. Additionally, at least a portion of the second thread groove is formed by feeding the threading tool that acts on the workpiece a second feed amount that differs from the first feed amount. With these steps, a compound thread portion is formed in the workpiece. As a result, it is possible to mass produce a compound screw having two thread structures of differing lead angles and/or lead directions with a high level of quality.

Abstract: This power receiving-type information acquisition and transmission device 101 is provided with one or more power receiving means 110 which receive power supply waves that can supply power, one or more power storage means 120 which store power obtained by the power receiving means, one or more information acquisition means 130 which acquire information by expending at least part of the aforementioned power of the power receiving means 110 and/or the power storage means 120, and one or more information transmission means 140 which utilize the power from the power storage means 120 to transmit information externally. This enables regular or steady information collection, and enables transmitting said information stably, on a permanent basis and remotely, i.e., either over a short or long distance externally.

Abstract: The present invention directly forms, on part of a member to be measured, a conduction path for measuring changes in said member. The present invention thus detects changes such as stress and displacement acting on a conduction-path-equipped member 30 intended for use in a structural member or the like. Consequently, circumstances generating stress in the member can be objectively monitored.

Abstract: The objective is to prevent the loosening of a structure with which a member 80 to be fastened and a base material 90 are fastened through a male screw body 10 and a washer 50. A screw-body-side seat part 22 is formed on the male screw body 10, and a first receiving part 60 and second receiving part 70 are formed on the washer side. A member-side seat part 82 is formed on the member 80 to be fastened. The first receiving part 60 and the screw-body-side seat part 22 have sawtooth-shaped recesses and protrusions. When an attempt is made to rotate the male screw body 10 in the direction of loosening, the recesses and protrusions engage one another, thereby preventing rotation. A recessed housing part of the member-side seat part 82 and the outer wall of the second receiving part 70 of the washer 50 have an eccentric circular shape. When an attempt is made to rotate the washer 50 in the direction of loosening, the eccentric circular shapes engage one another, thereby preventing rotation.

Abstract: A female threaded body (100) is provided with: a female threaded helical structure (114) formed on the inner circumferential surface of a hole (106a) in a cylindrical member (106); a contact surface (110a) formed on an axial direction end face of said cylindrical member (106); and a reverse rotation-preventing member (160), which has a protruding section (168) that is disposed and fixed on said contact surface (110a) and protrudes radially inward toward the rotation axis and in which the tip of said protruding section (168) configures an engaging edge (168a) that forms a continuous or discontinuous helix of a different lead angle and/or lead direction from the lead angle and/or lead direction of the female threaded helical structure (114). The engaging edge (168a) may allow a relative rotation of a male thread body (10) and the female threaded helical structure (114) in one direction.

Abstract: The objective is to prevent the loosening of a structure with which a member 80 to be fastened and a base material 90 are fastened through a male screw body 10 and a washer 50. A screw-body-side seat part 22 is formed on the male screw body 10, and a first receiving part 60 and second receiving part 70 are formed on the washer side. A member-side seat part 82 is formed on the member 80 to be fastened. The first receiving part 60 and the screw-body-side seat part 22 have sawtooth-shaped recesses and protrusions. When an attempt is made to rotate the male screw body 10 in the direction of loosening, the recesses and protrusions engage one another, thereby preventing rotation. A recessed housing part of the member-side seat part 82 and the outer wall of the second receiving part 70 of the washer 50 have an eccentric circular shape. When an attempt is made to rotate the washer 50 in the direction of loosening, the eccentric circular shapes engage one another, thereby preventing rotation.

Abstract: A duplex threaded body having a right-handed and left-handed thread on the circumferential surface of a single solid member. A single-nut or double-nut type internally-threaded body demonstrates a locking effect at an intermediate position without substantially loosening by using a combination of a duplex externally-threaded body and one or more internally-threaded bodies. Moreover, a screw structure in which a pair of internally-threaded bodies can only be removed once they are mutually coupled when screwed onto a duplex externally-threaded body, making it possible to impart tamper-proof characteristics and a locking effect. The duplex externally-threaded body has, on the outer circumferential surface, an overlapping region with a clockwise spiral right-handed thread and a counter-clockwise spiral left-handed thread in an overlapping manner.

Abstract: A duplex threaded body having a right-handed and left-handed thread on the circumferential surface of a single solid member. A single-nut or double-nut type internally-threaded body demonstrates a locking effect at an intermediate position without substantially loosening by using a combination of a duplex externally-threaded body and one or more internally-threaded bodies. Moreover, a screw structure in which a pair of internally-threaded bodies can only be removed once they are mutually coupled when screwed onto a duplex externally-threaded body, making it possible to impart tamper-proof characteristics and a locking effect. The duplex externally-threaded body has, on the outer circumferential surface, an overlapping region with a clockwise spiral right-handed thread and a counter-clockwise spiral left-handed thread in an overlapping manner.

Abstract: An object of the present invention is to provide a duplex threaded body having a right-handed thread and a left-handed thread on the circumferential surface of a single solid member. In addition, an object of the present invention is to provide a single-nut or double-nut type internally-threaded body that demonstrates a locking effect even at an intermediate position without substantially loosening by using a combination of a duplex externally-threaded body and one or more internally-threaded bodies. Moreover, an object of the present invention is to provide a screw structure in which a pair of internally-threaded bodies can only be removed by destruction once they are mutually coupled when screwed onto a duplex externally-threaded body, thereby making it possible to impart tamper-proof characteristics in addition to a locking effect.

Abstract: A screw cap opening/closure assistance mechanism (10) assists in opening and closure of a screw cap (20) in a screw cap mechanism. The screw cap opening/closure assistance mechanism includes a coupling part (13) provided on the screw cap (20) and an opening/closure assistance part (14) connected to the coupling part (13). One end of the coupling part is adapted to be rotated in unison with the screw cap (20). This opening/closure assistance part is positioned in proximity to an outer surface of the screw cap (20) when the screw cap opening/closure assistance mechanism has not been used or when it is not in use. For opening/closure, the screw cap opening/closure assistance part is moved away from the screw cap (20) so as to form a large diameter moving part rotatable in unison with the screw cap (20), An arrangement is so made that the force of rotation needed for the opening/closure operation for the screw cap (20) may be smaller.

Abstract: A water-saving device includes an attachment cover 2 that can be mounted to a tap 1 or the like, a water-saving piece 6 that is internally fitted to the attachment cover 2 and has at least one water discharge hole 62, and a watertight gasket 3 for preventing a water leak between the tap 1 or the like and the attachment cover 2, wherein a pressure reducing piece 4 is disposed between the attachment cover 2 and the water-saving piece 6, and in the pressure reducing piece 4 is formed a flow path changing hole 42 that forcibly changes the direction of water supplied from a water discharge means of the tap 1 or the like to reduce water pressure.