JPH0538055Y2 - - Google Patents

Description

[Detailed description of the invention] "Industrial application field" This invention is a fixing bolt hole structure for embedding in a sacrificial anode, and more specifically, a corrosion-protected material is Insulating the bolt head by screwing a bolt into a female threaded hole in the metal body to integrally fix the sacrificial anode to the metal body to be corrosion protected, and filling the entire hole with insulating resin to cover the bolt head. The present invention relates to a hole structure that prevents filled insulating resin from falling out of the hole.

``Prior art'' Conventionally, small sacrificial anodes (galvanic anodes) made of zinc or aluminum alloys are used to electrochemically protect metal objects such as outboard motors from corrosion. To attach it to a metal body, for example, as shown in FIG.
1b, and the metal body 1 to be protected from corrosion via the bolt through hole 11c.
Either screw the countersunk bolt 13 into the female screw hole 12a of No. 2, or as shown in FIG. The sacrificial anode 11 is integrally fixed to the corrosion-protected metal body 12 by screwing a hexagonal bolt 14 into the female screw hole 12a of the corrosion-protected metal body 12.

In order to prevent the sacrificial anode 11 from being locally consumed due to the intensive flow of anticorrosion current from the sacrificial anode 11 into the bolt head via an electrolyte solution such as seawater, In order to exhibit appropriate anti-corrosion performance for the metal body 12, the holes 1
The entire interior of 1a is filled with an insulating resin 15, such as epoxy resin, so as to cover the bolt head.

"Problem to be Solved by the Invention" By the way, as mentioned above, if the insulating resin 15 is simply filled in the hole 11a, there is a risk that the insulating resin 15 will fall out from the hole 11a due to vibration or the like. .

The present invention uses extremely simple means to prevent the insulating resin from falling out of the hole.

"Means for Solving the Problems" The first gist of the fixing bolt hole structure for embedding in the sacrificial anode according to the present invention is that the countersink 1 in the central surface of the embedding bolt hole 1a of the sacrificial anode 1
b. Screw the countersunk bolt 3 into the female screw hole 2a of the metal body 2 to be protected against corrosion through the bolt through hole 1c, and attach the sacrificial anode 1.
is integrally fixed to the metal body 2 to be protected from corrosion, and the hole 1a is
In the insulating means for the bolt head in which the entire inside is filled with insulating resin 5 so as to cover the head of the flatsunk bolt 3, the maximum diameter of the countersink hole 1b on the center surface of the hole 1a is set as the head of the flatsunk bolt 3. This is due to the fact that it is formed smaller than the maximum diameter of.

The second gist of the fixing bolt hole structure for embedding in the sacrificial anode according to the present invention is that the metal body 2 to be protected from corrosion is A bolt 4 is screwed into the female threaded hole 2a to integrally fix the sacrificial anode 1 to the metal body 2 to be protected from corrosion, and the entire inside of the hole 1a is filled with insulating resin 5 so as to cover the head of the bolt 4. In the insulating means for the bolt head, the center surface of the hole 1a is formed slightly higher, and the hole 1a is made slightly higher.
The reason is that the diameter of the central part of a is smaller than the maximum diameter of the head of the bolt 4.

"Function" According to the present invention, when the sacrificial anode 1 is integrally fixed to the corrosion-protected metal body 2 with the countersunk bolt 3 or the bolt 4, the bottom surface of the embedding bolt hole 1a,
A gap can be formed between the countersunk bolt 3 or the lower surface of the head of the bolt 4, and therefore the hole 1a
Insulating resin 5 is applied to the entire inside so as to cover the bolt head.
By filling the insulating resin 5, a part of the insulating resin 5 flows into the gap between the bottom surface of the hole 1a and the lower surface of the bolt head, so that the solidified insulating resin 5 after filling is prevented by vibration. It will not fall out of the hole even if you put it on.

``Example'' Next, each example of the present invention will be described based on FIGS. 1 and 2.

What is shown in FIG. 1 is a first embodiment of the present invention, which is a bolt hole 1a for embedding a sacrificial anode 1
From there, through the countersink hole 1b on the center surface of this hole 1a and the bolt through hole 1c, the female threaded hole 2a of the metal body 2 to be corrosion protected is inserted.
The sacrificial anode 1 is integrally fixed to the metal body 2 to be protected against corrosion by screwing a countersunk bolt 3, and the maximum diameter of the countersink hole 1b in the central surface of the hole 1a is determined by the countersunk bolt 3. By forming the head of the countersunk bolt 3 to be smaller than the maximum diameter of the head of the bolt 3, the head of the countersunk bolt 3 protrudes from the bottom surface of the hole 1a, and the metal body 2 to be corroded passes from the hole 1a, through the countersunk hole 1b, and the bolt through hole 1c. female screw hole 2
When the sacrificial anode 1 is integrally fixed to the metal body 2 to be protected against corrosion by screwing the countersunk bolt 3 into the hole 1a, there is no insulation between the bottom of the hole 1a and the lower surface of the head of the countersink bolt 3. A gap g is formed through which a portion of the resin 5 flows.

What is shown in FIG. 2 is a second embodiment of the present invention, in which the sacrificial anode 1 is inserted from the embedding bolt hole 1a through the bolt through hole 1c in the central part of the hole 1a. The sacrificial anode 1 is integrally fixed to the corrosion-protected metal body 2 by screwing a hexagonal bolt 4 into the female screw hole 2a of the metal body 2.
By making the center surface of the hole 1a slightly higher and making the diameter of the center surface of the hole 1a smaller than the maximum diameter of the head of the hex bolt 4,
Screw the hexagonal bolt 4 from the hole 1a, through the bolt through hole 1c, into the female threaded hole 2a of the metal body 2 to be corrosion protected,
When the sacrificial anode 1 is integrally fixed to the metal body 2 to be protected from corrosion, a gap g is formed between the bottom of the hole 1a and the lower surface of the head of the hex bolt 4, through which a portion of the insulating resin 5 flows. That's what I did.

"Effects of the Invention" According to the present invention described above, when the sacrificial anode 1 is integrally fixed to the metal body 2 to be corrosion-protected with the countersunk bolt 3 or the bolt 4, the bottom surface of the embedding bolt hole 1a and the countersunk bolt 3 Alternatively, a gap can be formed between the head of the bolt 4 and the periphery of the lower surface, and therefore, by filling the entire hole 1a with the insulating resin 5 so as to cover the bolt head, a portion of the insulating resin 5 can be formed. Since the insulating resin 5 flows into the gap between the bottom surface of the hole 1a and the periphery of the lower surface of the bolt head, the solidified insulating resin 5 after filling will not fall out of the hole even due to vibration.

[Brief explanation of the drawing]

FIG. 1 is a longitudinal sectional view showing a first embodiment of the present invention;
FIG. 2 is a longitudinal sectional view showing a second embodiment of the present invention, and FIGS. 3 and 4 are longitudinal sectional views showing each conventional example. 1...Sacrificial anode, 1a...Bolt hole for embedding,
1b...Countersunk hole, 1c...Bolt through hole, 2...Metal body to be protected against corrosion, 2a...Female screw hole, 3...Countersunk bolt, 4...Hex bolt, 5...Insulating resin.

Claims (1)

[Claims for Utility Model Registration] (1) Insert the countersunk bolt 3 into the female screw hole 2a of the metal body 2 to be protected against corrosion through the countersink hole 1b and the bolt through hole 1c in the central part of the bolt hole 1a for embedding the sacrificial anode 1. bolt head insulating means for integrally fixing the sacrificial anode 1 to the corrosion-protected metal body 2 by screwing together, and filling the entire inside of the hole 1a with an insulating resin 5 so as to cover the head of the countersunk bolt 3; A fixing bolt hole structure for embedding in a sacrificial anode, characterized in that the maximum diameter of the countersink hole 1b on the central surface of the hole 1a is smaller than the maximum diameter of the head of the countersunk bolt 3. (2) Screw the bolt 4 into the female screw hole 2a of the metal body 2 to be protected through the bolt through hole 1c in the center of the bolt hole 1a for embedding the sacrificial anode 1, and attach the sacrificial anode 1 to the metal body to be protected. In the insulating means for the bolt head, which is integrally fixed to the bolt 2 and filled with an insulating resin 5 so as to cover the head of the bolt 4, the entire inside of the hole 1a is formed so that the center surface of the hole 1a is slightly higher. Further, a fixing bolt hole structure for embedding in a sacrificial anode is characterized in that the diameter of the center surface of the hole 1a is smaller than the maximum diameter of the head of the bolt 4.