Double-end threaded body and internally-threaded body

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. A right-handed internally-threaded body in which a right-handed thread is formed, and a left-handed internally-threaded body in which a left-handed thread is formed, that are screwed onto a duplex externally-threaded body.

1 . An internally-threaded body comprising:
 wherein a clockwise spiral thread and a counter-clockwise spiral thread are provided as a pair,   wherein the internally-threaded body has a clockwise or counter-clockwise intermittent or continuous spiral thread formed on the inner circumferential surface of a tubular member having a roughly tubular shape, and has, on one end in the tubular direction of the tubular member, reverse rotation preventing means for preventing reverse rotation relative to the direction of rotation when screwed onto the duplex threaded body, and   wherein the reverse rotation preventing means has one or more plate pieces, the plate piece is arranged protruding from the inner circumferential surface of the tubular member towards the axis of rotation of the internally-threaded body, the end portion of the plate piece serves as a clockwise or counter-clockwise spiral thread, and the thread formed by the end of the plate piece has a finite inclination angle relative to a lead angle of the thread formed on the inner circumferential surface of the tubular member.   
     
     
         2 . The internally-threaded body according to  claim 1 , wherein when a lead angle of the spiral thread formed on the inner circumferential surface of the internally-threaded body is defined as θ, the thread formed by the end of the plate piece is inclined by (165-2θ)° to (195-2θ)° relative to this lead angle. 
     
     
         3 . The internally-threaded body according to  claim 1 , wherein the reverse rotation preventing means has a spiral slope portion centered about the axis of rotation of the internally-threaded body formed on one end of the tubular member, and one or more plate pieces arranged on this slope portion, and when a lead angle of the thread formed on the inner circumferential surface of the internally-threaded body is defined as θ, the inclination angle of the slope portion is (165-2θ)° to (195-2θ)° relative to this lead angle. 
     
     
         4 . An internally threaded body in which a clockwise spiral thread and a counter-clockwise spiral thread are provided as a pair, the internally-threaded body comprising:
 a right-handed internally-threaded body in which a clockwise spiral thread is formed on the inner circumferential surface of a first tubular member having a roughly tubular shape, and a left-handed internally-threaded body in which a counter-clockwise spiral thread is formed on the inner circumferential surface of a second tubular member having a roughly tubular shape, and   wherein coupling means for coupling the right-handed internally-threaded body and the left-handed internally-threaded body by causing the right-handed internally-threaded body and the left-handed internally-threaded body to approach each other is provided in one or both of the right-handed internally-threaded body and the left-handed internally-threaded body.   
     
     
         5 . The internally-threaded body according to  claim 4 ,
 wherein the coupling means is constituted by an inserting portion which is provided on one of the right-hand internally-threaded body and the left-handed internally-threaded body, and a receiving portion that is provided on the other internally-threaded body and receives the inserting portion, and   when the right-handed internally-threaded body and the left-handed internally-threaded body are mutually coupled together, the inserting portion is received by the receiving portion and the inserting portion and the receiving portion are mutually engaged.   
     
     
         6 . The internally-threaded body according to  claim 4 , wherein
 a slit roughly parallel or roughly perpendicular to the axial direction is formed in one or both of the right-handed internally-threaded body and the left-handed internally-threaded body.   
     
     
         7 . The internally-threaded body according to  claim 4 , wherein the coupling means has reverse rotation preventing means for preventing reverse rotation relative to the direction of rotation when one of the right-handed internally-threaded body and the left-handed internally-threaded body is screwed onto the duplex threaded body. 
     
     
         8 . The internally-threaded body according to  claim 7 , wherein among the right-handed internally-threaded body and the left-handed internally-threaded body the reverse rotation preventing means of one or both is composed of one or more spring portions or serrated portions, or the spring portion or the serrated portion is provided integrally or on the other internally-threaded body. 
     
     
         9 . The internally-threaded body according to  claim 4 , wherein the coupling means has rotatable retaining means for rotatably coupling together one end of the right-handed internally-threaded body and one end of the left-handed internally-threaded body, and preventing separation of the right-handed internally-threaded body and the left-handed internally-threaded body in the axial direction. 
     
     
         10 . The internally-threaded body according to  claim 7 , wherein the coupling means has rotatable retaining means for rotatably coupling together one end of the right-handed internally-threaded body and one end of the left-handed internally-threaded body, and preventing separation of the right-handed internally-threaded body and the left-handed internally-threaded body in the axial direction. 
     
     
         11 . The internally-threaded body according to  claim 5 , wherein the inserting portion is preliminarily coupled with the receiving portion, and the right-handed internally-threaded body and the left-handed internally-threaded body are mutually rotatably and inseparably integrated. 
     
     
         12 . The internally-threaded body according to  claim 4 , wherein the coupling means is constituted by a first magnetic pole provided on one end of one of the right-handed internally-threaded body and the left-handed internally-threaded body, and a second magnetic pole expressed or provided on one end of the other internally-threaded body, the first magnetic pole and the second magnetic pole are mutually different magnetic poles, and the right-handed internally-threaded body and the left-handed internally-threaded body are coupled by magnetically coupling these magnetic poles. 
     
     
         13 . The internally-threaded body according to  claim 4 , wherein the maximum diameter of the outer diameter of one of the internally-threaded bodies among the right-handed internally-threaded body and the left-handed internally-threaded body is set to be equal to or less than the minimum diameter of the outer diameter of the other internally-threaded body. 
     
     
         14 . The internally-threaded body according to  claim 5 , wherein the maximum diameter of the outer diameter of one of the internally-threaded bodies among the right-handed internally-threaded body and the left-handed internally-threaded body is set to be equal to or less than the minimum diameter of the outer diameter of the other internally-threaded body. 
     
     
         15 . The internally-threaded body according to  claim 7 , wherein the maximum diameter of the outer diameter of one of the internally-threaded bodies among the right-handed internally-threaded body and the left-handed internally-threaded body is set to be equal to or less than the minimum diameter of the outer diameter of the other internally-threaded body. 
     
     
         16 . The internally-threaded body according to  claim 9 , wherein the maximum diameter of the outer diameter of one of the internally-threaded bodies among the right-handed internally-threaded body and the left-handed internally-threaded body is set to be equal to or less than the minimum diameter of the outer diameter of the other internally-threaded body. 
     
     
         17 . The internally-threaded body according to  claim 11 , wherein the maximum diameter of the outer diameter of one of the internally-threaded bodies among the right-handed internally-threaded body and the left-handed internally-threaded body is set to be equal to or less than the minimum diameter of the outer diameter of the other internally-threaded body.