Non-loosening fastening structure

Abstract

To provide a fastening structure for fastening a left-right screw intersection forming bolt, which has a simple structure and does not loosen. A right screw nut having a recess, an elastic member having a rotation-preventing protrusion and a tongue portion, and a left screw nut having a tapered surface and a recess are included. After the bolt is tightened with the right screw nut and the elastic member is mounted, the tongue portion of the elastic member is tightened while being pressed with the left screw nut, so that the tongue portion jumps up to the recess of the left screw nut, and the left screw nut is locked and fastened. As illustrated in FIG. 9, the fastening structure can also be configured by changing the right screw nut to a left screw nut, the elastic member to an elastic member, and the left screw nut to a right screw nut.

Claims

1. A fastening structure used for fastening a bolt formed by coaxially intersecting a right screw and a left screw, and comprising a right screw nut (2) having a recess (2a), an elastic member (3) having a rotation-preventing protrusion (3a) and a tongue portion (3b), and a left screw nut (4) having a surface (4a) in which a contact surface with the elastic member (3) is subjected to tapering and a recess (4b), wherein the tongue portion (3b) protrudes radially outward with respect to the left screw nut (4).

2. A fastening structure used for fastening a bolt formed by coaxially intersecting a right screw and a left screw, and comprising a left screw nut (2h) having a recess (2ah), an elastic member (3h) having a rotation-preventing protrusion (3ah) and a tongue portion (3bh), and a right screw nut (4h) having a surface (4ah) in which a contact surface with the elastic member (3h) is subjected to tapering and a recess (4bh), wherein the tongue portion (3bh) protrudes radially outward with respect to the left screw nut (4h).

Description

BRIEF DESCRIPTION OF DRAWINGS

(1) FIG. 1 is a perspective view for when fastened on a bolt according to the present invention with a right screw nut.

(2) FIG. 2 is a perspective view for when an elastic member is mounted on the right screw nut.

(3) FIG. 3 is a perspective view for when fastened from above the elastic member with a left screw nut.

(4) FIG. 4 is a perspective view for when the elastic member is further tightened with a left screw nut, and the nuts are locked to each other.

(5) FIG. 5 is a top view of the fastening structure.

(6) FIG. 6 is a side view of the fastening structure.

(7) FIG. 7 is a perspective view for a case where the fastening structure is fastened or unfastened with a socket wrench.

(8) FIG. 8 is a perspective view for a case where the fastening structure is unfastened with a socket wrench.

(9) FIG. 9 is a side view for when the right screw nut (2) is a left screw nut (2h), the elastic member (3) is an elastic member (3h), and the left screw nut (4) is a right screw nut (4h).

DESCRIPTION OF EMBODIMENTS

(10) FIG. 1 is a view when a left-right screw intersection forming bolt (1) is passed through a fastening target (5) according to the present invention and fastened in a rotating direction of R1 by a right screw nut (2).

(11) FIG. 2 is a view in which the elastic member (3) is mounted in the direction of S1 such that a rotation-preventing protrusion (3a) of the elastic member (3) meshes with a recess (2a) on the right screw nut.

(12) FIG. 3 is a view for when a left screw nut (4) is tightened on the elastic member (3) in a counterclockwise direction of R2, and the elastic member (3) is tightened by a tapered surface (4a) of the left screw nut (4).

(13) FIG. 4 is a view for when the left screw nut (4) is tightened by the rotation in the R2 direction, and eventually the tongue portion (3b) of the elastic member (3) jumps up to the portion of the left screw nut recess (4b), so that the fastening is in a locked state.

(14) The fastening structure according to the present invention can be easily fastened or unfastened using a generally used wrench, a closed wrench, or a socket wrench.

(15) FIG. 8 is a view for a case where unfastening is performed with a socket wrench. In this case, the edge portion of the distal end of the socket wrench pushes down the tongue portion (3b) of the elastic member (3) by merely pressing with the socket wrench in the N direction, and the locked state can be released merely by rotating the socket wrench in a clockwise direction while maintaining the state.

(16) When there is no socket wrench, a flat-blade screwdriver is inserted into the recess (4b) of the left screw nut (4) in FIG. 7 in the P1 direction, the handle of the screwdriver is pushed down in the R3 direction, and while this state is maintained, a normal wrench or a closed wrench is set and turned to the right, so that the fastening lock state can be easily released.

REFERENCE SIGNS LIST

(17) 1 left-right screw intersection forming bolt 2 right screw nut having recess (2a) 2h left screw nut having recess (2ah) 2a right screw nut recess 2ah left screw nut recess 3 elastic member having rotation-preventing protrusion (3a) and tongue portion (3b) 3h elastic member having rotation-preventing protrusion (3ah) and tongue portion (3bh) 3a elastic member rotation-preventing protrusion 3b elastic member tongue portion 3ah elastic member rotation-preventing protrusion 3bh elastic member tongue portion 4 left screw nut having tapered surface (4a) and recess (4b) 4h right screw nut having tapered surface (4ah) and recess (4bh) 4a left screw nut tapered surface 4b left screw nut recess 4ah right screw nut tapered surface 4bh right screw nut recess 5 fastening target 6 socket wrench N1 elastic member tongue portion pressing direction P1 flat-blade screwdriver inserting direction R1 clockwise direction R2 counterclockwise direction R3 pushing direction of handle portion by turning of flat-blade screwdriver S1 elastic member mounting direction