JP2528691Y2 - Rust prevention bolt and nut cover - Google Patents

Description

[Detailed description of the invention] [Industrial application field] The present invention is for rust prevention of bolt tips and nuts protruding after tightening bolts and nuts of steel structures such as construction, civil engineering rebar, steel frames and bridges. The present invention relates to a cover for rust prevention bolts and nuts to be used for rust prevention.

[Background Art] For example, bolts and nuts used in joints of steel structures such as bridges constructed in coastal areas are susceptible to corrosion. Therefore, after bolts and nuts are tightened, the tips of bolts protruding from the joints. The nuts and nuts are usually subjected to anticorrosion treatment by applying paint. However, the edges of the bolts and nuts and the tips of the bolts (protruding parts of the bolts), etc., are not sufficiently coated even when they are painted, and become thin, and the bolts and nuts are difficult to undercoat. In many cases, rusting occurred earlier than other parts.

For this reason, as shown in FIG. 2, the tip (screw projection) 1a and the nut 2 of the bolt 1 projecting after being tightened by the bolt 1 and the nut 2 and in contact with the atmosphere are conventionally covered with the atmosphere as shown in FIG. A cover for bolts and nuts has been devised so as to prevent the
issue). That is, in the above-mentioned bolt and nut cover, the cover main body 3 is made of a flexible material such as soft synthetic resin or rubber, and the head 4, the inverted bent portion 5 and the skirt portion 6 formed into a hexagonal shape according to the nut shape. Are formed so as to be integrally connected to each other, and a thread 7 is provided on the inner surface of the head 4 of the cover main body 3. As shown by the dashed line, the head 4 is screwed by screwing the screw portion 7 to the tip 1a of the bolt 1 in a state where the head portion 4 has been inverted at the inversion bending portion 5,
Thereafter, the skirt portion 6 that has been turned over is folded back so as to cover the tip portion 1a of the bolt 1 and the nut 2 for use. 8 is a washer, 9 and 10
Indicates a member to be tightened.

[Problem to be Solved by the Invention] However, in the case of the above-mentioned conventional cover for bolts and nuts, the cover main body 3 is made up of the tip 1a of the bolt 1 and the nut 2
However, since the washer 8 is usually arranged at the inner position of the nut 2, the water from the washer 8 into the cover main body 3 from the washer 8 portion over a long period of time is used. It is unavoidable that water enters the inside of the cover body 3 and the dewed water enters the cover body 3, causing moisture to enter the cover body 3 to cause corrosion of the tip 1 a of the bolt 1 and the nut 2. In particular, in a steel structure erected in a coastal area, salt water containing sea salt particles may enter the cover main body 3, and there is a problem of promoting the corrosion.
Also, in order to prevent rust near the tip 1a of the bolt 1,
In some cases, grease 11 or grease-like rust-preventive oil is filled in the thread portion 7 of the cover main body 3. However, when a steel structure exposed to the air environment is used, the When the temperature of the structure rises, the above-mentioned general grease 11 or grease-like rust-preventive oil deteriorates and flows out from the inside of the cover main body 3 to the outside. there were.

Therefore, the present invention is intended to prevent the rust of bolts and nuts from being rusted for a long period of time even when used in such a harsh environment, because the rust preventive oil filled in the cover main body exhibits the rust preventive function for a long time. It is assumed that.

[Means for Solving the Problems] In order to solve the above problems, the present invention provides a head for screwing and fixing to a tip end of a bolt, a skirt portion adapted to the shape of a nut, and an inverted bent portion. The skirt, which has a larger diameter than the above-mentioned start part and is longer than the thickness of the washer according to the size of the washer, is integrally connected to the end of the skirt through a flat part. Then, when the end face of the skirt portion is pressed against the surface of the member to be tightened from outside the washer, a flat portion connected to the skirt portion is bent toward the skirt portion and bent. And a rust-preventive bolt and nut cover characterized in that a rust-preventive oil having heat resistance and seawater resistance is loaded on the inner surface of the cover main body. .

[Operation] After the cover-based skirt is previously inverted at the inverted bent portion, the cover-based head is screwed into the tip of the protruding bolt after tightening the member to be tightened, and fixed. If the tip of the bolt and the nut are covered by folding back the skirt that has been turned over, the skirt of the cover mainly covers the washer, and the end face of the skirt of the member to be tightened from the outside of the washer. Although it is pressed against the surface, the end face of the skirt is brought into close contact with the surface of the member to be tightened by the pressing force due to the elastic force generated by the plane part connecting the skirt part to the skirt part warping toward the skirt part side, The effect of preventing intrusion of moisture is exhibited. Further, even if moisture may infiltrate into the cover main body, rust generation is prevented because the rust preventive oil loaded therein has seawater resistance. Further, since the rust preventive oil has heat resistance, it does not flow out even in a high-temperature environment, and can function as a rust preventive oil for a long time.

Hereinafter, an embodiment of the present invention will be described with reference to the drawings.

FIG. 1 shows an embodiment of the present invention. Similar to the cover for bolts and nuts shown in FIG. 2, a cover main body 3 is made of a flexible material such as a head 4, an inverted bent portion 5, and a skirt. Part 6
Is formed so as to be integrally connected, and a thread portion 7 for screwing and fixing to the tip portion 1a of the bolt 1 is provided on the inner surface of the head portion 4 to provide excellent weather resistance. The end of the skirt portion 6 of the cover main body 3 has a washer 8 arranged inside the nut 2 when the bolt 1 and the nut 2 are tightened, so that the diameter of the skirt portion 6 is larger than that of the skirt portion 6 so as to cover the washer 8 from outside. When the skirt 12 which is longer than the thickness of the washer 8 is integrally connected via the flat portion 13, and the end face of the skirt 12 is pressed against the surface of the member 9 to be tightened from outside the washer 8. The flat portion 13 is bent so as to bend toward the skirt portion 6 side.
A rust preventive oil 14 having heat resistance and seawater resistance is loaded and applied to the inner surface of the cover main body 3 which reaches. Note that it is convenient to attach sealing paper or the like to the surface of the filled rust-preventive oil 14 and to peel it off at the time of use. or,
FIG. 1 shows a case where the rust-preventive oil 14 is loaded and applied over the entire inner surface of the cover main body 3, but may be applied only to the thread portion 7.

As the rust preventive oil used in the present invention, oleic acid salt of dicyclohexylamine: 7 to 10 parts Naphthalene sulfonate: 5 to 15 parts Mineral oil: 65 to 80 parts Sorbitan stearic acid salt: 8 to 10 parts Paraffin: 7 to 10 parts are added to the above. Hydrophobic silica: 10 to 15 parts are added to the above.

When the tip 1a and the nut 2 of the bolt 1 to which the members 9 and 10 are to be tightened are covered with the rust-preventing bolt and nut cover of the present invention having the above structure, the conventional bolt shown in FIG. In the present invention, the skirt portion 12 for surrounding the washer 8 at the end of the skirt portion 6 of the cover main body 3 through the flat portion 13 can be used. As shown in FIG. 1, when the tip 1a of the bolt 1 and the nut 2 are covered, the washer 8 can be covered simultaneously. At this time, the length of the hem 12 is increased
When the end face of 12 is pressed against the surface of the member 9 to be tightened, the flat portion 13 is warped to the skirt portion 6 side.
The end face of the skirt portion 12 can be strongly pressed from the outside of the washer 8 to the surface of the member 9 to be tightened by the elastic force applied to the skirt portion 12 by the warp of the flat portion 13, and the adhesion to the member 9 to be tightened can be improved. Therefore, the effect of preventing moisture intrusion can be further improved. Therefore, infiltration of corrosive rainwater or dew water containing salt water or the like from the washer 8 into the cover main body 3 can be prevented as much as possible. Even if the corrosive rainwater or dew condensation water enters the cover body 3, the anticorrosive oil 14 having seawater resistance is filled in the vicinity of the tip 1a of the bolt 1. The rusting is prevented because of the rusted state. Therefore, the corrosion prevention of a portion where the coating film is thin and which is a starting point of rust can be made for a long time. Further, since the rust-preventive oil 14 also has heat resistance, even if the members 9 and 10 to be fastened are steel structures exposed to the atmospheric environment, and even if the temperature of the steel structures rises, the rust-preventive oil 14 is prevented from being damaged. The rust oil is not deteriorated and flows out of the cover main body 3 to the outside, and the function as the rust prevention oil can be maintained for a long period of time.

Next, a test comparing the bolt and nut cover of the present invention in which the rust-preventive oil 14 having the above composition was applied to the thread portion 7 of the cover main body 3 with other prototypes A and B was performed. The results of the salt spray test, the heating test, and the temperature stability test are described in Tables 1, 2, and 3 below. In the salt spray test, the temperature condition was
The heating test is a heating test of the rust preventive oil filled in the cover, and the temperature stability test is
This shows the state after 30 minutes of the set temperature. In addition, the prototype A uses a rust-preventive oil to which the hydrophobic silica in the above-described composition is not added, and the prototype B has the hydrophobic silica with paraffin in the above-described composition being added. It uses rust-preventive oil that has not been used.

As is clear from the above test results, in the present invention, the bolts and nuts are made to be rust-proofed using the above-mentioned composition as the rust-preventive oil. It is stable even at high temperatures and can perform the rust prevention function for a long time.

In addition, the cover for rust prevention bolts and nuts of the present invention is not limited to bolts and nuts of steel structures such as bridges in coastal areas,
Of course, the present invention can be widely applied to bolts and nuts in the atmosphere used in construction and civil engineering, and various changes can be made without departing from the scope of the present invention.

[Effects of the Invention] As described above, the rust preventive bolt and nut cover of the present invention exerts the following excellent effects.

(I) At the end of a skirt portion integrally connected to the head portion via a reversing bent portion for screwing and fixing to a tip end portion of a bolt, the diameter of the skirt portion is larger than that of the start portion in accordance with the size of the washer. And a skirt portion longer than the thickness of the washer is integrally connected via a flat portion, and when the end surface of the skirt portion is pressed against the surface of the member to be tightened from the outside of the washer, the flat portion forms a skirt. The main body of the cover is formed so as to warp to the side, and the inner surface of the main body of the cover is loaded with rust-preventive oil having heat resistance and seawater resistance. When the nut is covered with the cover main body, the end face of the hem of the cover main body is pressed perpendicularly to the surface of the member to be tightened from the outside of the washer. At this time, the flat part connecting the hem to the skirt is formed by the skirt. Part is warped Then, the pressing force from the vertical direction to the member to be tightened is applied to the hem by the elastic force due to the warpage of the flat portion, so that the adhesion of the hem end face to the surface of the member to be tightened can be further improved, and the washer can be further improved. The effect of preventing the intrusion of moisture from the part is high, and even if water enters the cover body, the rust preventive oil applied to the inner surface has seawater resistance. , Can prevent rusting.

(Ii) Since the rust preventive oil applied inside the cover body also has heat resistance, it does not leak out even in a high temperature environment and loses its rust preventive function. A stable rust prevention function can be achieved.

(Iii) From the above, especially when used for bolts and nuts of steel structures installed in harsh environments such as coastal areas,
It is extremely effective.

[Brief description of the drawings]

FIG. 1 is a schematic view showing an embodiment of a bolt and nut cover of the present invention, and FIG. 2 is a schematic view of a conventional bolt and nut cover. DESCRIPTION OF SYMBOLS 1 ... Bolt, 1a ... Tip part, 2 ... Nut, 3 ... Cover main body, 4 ... Head, 5 ... Inversion bending part, 6 ... Skirt part, 7 ...
Screw part, 8 ... washer, 9, 10 ... member to be tightened, 12 ... hem part, 13 ... flat part, 14 ... rust preventive oil.

Claims (1)

(57) [Scope of request for utility model registration] 1. A skirt part adapted to the shape of a nut is integrally connected to a head for screwing and fixing to a tip part of a bolt via a reversing bent part, and further corresponds to the size of a washer. A skirt portion having a diameter larger than that of the skirt portion and longer than the thickness of the washer is integrally connected to an end of the skirt portion via a flat portion, and an end surface of the skirt portion is a member to be tightened from outside the washer. A flat body connected to the skirt portion when pressed against the surface of the skirt portion bends toward the skirt portion and bends to form a cover main body made of a flexible material. A rust preventive bolt and nut cover that is loaded with rust preventive oil having water resistance and seawater resistance.