JP3022361U - Nuts for preventing salt damage - Google Patents

Abstract

(57) [Summary] [PROBLEMS] To provide a nut capable of effectively preventing salt damage with a simple structure. SOLUTION: In a bolt fastening device in which a nut 2 is screwed and tightened to a threaded portion of a bolt 1 which penetrates members to be fastened A and B, the nut is screwed to a tip threaded portion 5 of a bolt which projects through the nut. A rotary tool engaging groove 6 is pierced in the diametrical direction on the top surface of a cylindrical plastic cap 4 having a female screw 3a on its inner peripheral wall.

Description

[Detailed description of the device]

[0001]

[Technical field to which the device belongs]

 The present invention relates to a salt damage prevention nut used when joining members in steel towers and other structures constructed in coastal areas, areas strongly affected by sea breeze, etc. with bolts and nuts.

[0002]

[Prior art]

 Conventionally, in this type of structure, the members constituting the structure are fastened with steel bolt nuts.

[0003]

[Problems to be solved by the device]

 In the above-mentioned prior art, the threaded portion of the tip of the bolt protruding from the tightening nut of the member is easily corroded by salt, and the corroded portion often penetrates into the inside to cause great damage. The present invention has been proposed in view of such circumstances, and an object of the present invention is to provide a nut capable of effectively preventing salt damage with a simple structure.

[0004]

[Means for Solving the Problems]

 In order to achieve the above-mentioned object, the salt damage prevention nut according to the present invention is a bolt fastening device in which a nut is screwed and tightened to a threaded portion of a bolt passing through a member to be fastened, and the nut is projected through the nut. A female threaded portion to be screwed into the threaded portion of the bolt is formed on the top surface of a cylindrical plastic cap body provided on the inner peripheral wall with a groove groove for engaging a rotary tool diametrically formed. ing.

[0005]

[Embodiment of device]

 The drawings show a preferred embodiment of the present invention, in which A and B represent, for example, members of a truss tower to be joined, a bolt 1 is inserted through both members A and B, and a nut 2 is attached to the tip screw portion. Is screwed and tightened, and both members A and B are fastened. Reference numeral C denotes a salt damage preventing nut, which is composed of a plastic cap 4 having a recess 3 having an internal thread 3a provided on the inner peripheral surface thereof, and the internal thread 3a portion of the cap 4 has the both members A, A female screw 3a provided in the recess 3 of the nut C is screwed and fastened to a screw portion 5 of the B fastening bolt 1 which protrudes to the outside of the member B, and the screw portion 5 protrudes from the nut 2 of the bolt 1. Is covered with the salt damage preventing nut C. In addition, on the top surface of the salt damage preventing nut C, there is provided a groove 6 for engagement of a tool for rotating the nut C along the diameter direction, and the nut engaged by the tool engaged with the groove 6 is used. C is screwed. In addition, 7 in the drawing is a washer.

According to the illustrated embodiment, when the nut 2 is screwed and tightened on the threaded portion of the bolt 1 penetrating the members A and B and the members A and B are fastened, the nut 2 is passed and the outside A salt damage prevention nut C made of plastic is fitted to the threaded portion 5 of the bolt 1 protruding to the end, and a female screw 3a provided on the inner peripheral surface of the recess 3 of the nut C is attached to the tip threaded portion 5 of the bolt 1. By screwing, the tip screw portion 5 of the bolts 1 for fastening the members A and B is surely covered with the salt damage prevention nut C made of plastic, and the tip screw portion 5 of the bolt 1 is corroded by salt damage. To be prevented.

[0007]

[Effect of device]

 According to the present invention, as described above, the plastic cylindrical cap having the internal thread portion on the inner peripheral wall further extends through the fastening nut of the bolt passing through the member to be fastened and extends outward. By being screwed to the tip screw portion, corrosion of the bolt tip screw portion due to salt and the like and permeation of the corrosion into the member are prevented, thereby preventing salt damage.

[0008] Furthermore, since a grooved groove is formed in the top surface of the plastic cap body in the diametrical direction, a tool is locked in the grooved groove, and the cap is inserted through the tool. By rotating the body, the tightening work of the salt damage prevention nut to the tip of the member tightening bolt can be easily and surely performed.

[Brief description of drawings]

FIG. 1 is a vertical cross-sectional view showing a usage state of a salt damage prevention nut according to the present invention.

FIG. 2 is a plan view of FIG.

[Explanation of symbols]

 A member B member C Salt damage prevention nut 1 Bolt 2 Nut 3 Recess 3a Female screw 4 Plastic crown cap 5 Bolt end thread 6 Engagement groove groove 7 Washer

Claims (1)

[Scope of utility model registration request] 1. A bolt fastening device comprising a nut that is screwed and tightened onto a threaded portion of a bolt that penetrates a member to be fastened, and an internal threaded portion that is screwed onto a threaded end of a bolt that projects through the nut A nut for preventing salt damage, comprising a cylindrical plastic cap provided on a peripheral wall and a concave groove for engaging a rotary tool formed in a diameter direction on a top surface of the cap.