JP2002067696A - Insulative fitting method of door gilt for motor truck - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a method ensuring that the protection against the touch corrosion can be achieved by additional fitting of inexpensive parts for the insulation at joint between a bare metal without gilding and painting, such as stainless steel door metal fittings, and the aluminum surface member fitted thereof. SOLUTION: Upon the installation of door metal fittings like door hinge, etc., with bolts against the door covered with aluminum surface plate on its surface, the above aluminum surface metal and door fittings are fastened with bolts making the insulation material lie between them. The sleep washer has funnel shape collar around bolt insertion hole, which ensures that the bolts are completely without touch on the aluminum surface plate.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a contact made by a potential difference between mounting brackets (hereinafter referred to as door fittings) such as a hinge fitting and a lock fitting and an aluminum panel to which the same is attached to, for example, a rear door of a van type truck. The present invention relates to an insulation method for preventing corrosion.

[0002]

2. Description of the Related Art In recent years, the amount of snow-melting salt sprayed on roads in cold regions has increased, and the corrosion of aluminum panels adhered to the door surfaces of van-type trucks has increased. In particular, the corrosion of the pre-coated aluminum panel when using a door fitting having an exposed metal part such as stainless steel is severe, and the appearance is significantly impaired.

In order to solve this problem, (1) when the door fitting is mounted on a door body covered with an aluminum surface material by bolts, the bolt hole 9 of the aluminum surface material 3 is made larger than the bolt diameter as shown in FIG. At dawn, corrosion was prevented by preventing direct contact between the bolt and the aluminum face plate.

Alternatively, (2) the thread portion of the bolt is cut off so that the aluminum surface material does not directly contact the bolt.

[0005] These methods (1) and (2) have the effect of preventing corrosion, respectively. However, means such as drilling a large bolt hole or notching a screw portion of a bolt against an aluminum face plate are dimensional. Not only is it not easy to use or easy to process, but it is not preferable in terms of finish.

[0006]

Insulation is achieved by adding inexpensive components to the joint between a metal without plating and painting, for example, a stainless steel door fitting, and the aluminum surface material on the side to which it is to be attached. It is an object to provide a method capable of reliably achieving prevention.

[0007]

SUMMARY OF THE INVENTION In a door whose surface is covered with an aluminum face plate, an insulating material is interposed between the aluminum face material and the door metal fitting when a door fitting such as a door hinge is attached by a bolt. Bolts. Further, the sleeve washer has a downward funnel-shaped collar around the bolt insertion hole, thereby completely preventing contact between the bolt and the aluminum face plate.

[0008]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. In FIG. 1, 1
Is the door material that makes up the rear door of a truck,
The surface of the core material 2 is covered with an aluminum face material 3 with a precoat. 4 is a bolt for fixing door fittings 5 to the core material,
4 'is a cap nut.

The door fitting 5 is a metal that has not been painted or plated, and is a metal that is nobler (potential is higher) than aluminum, or is plated with such a metal. For example, copper or copper alloy, nickel, nickel-plated iron,
Metal plated with Hastelloy metal, gold, silver, platinum, etc.
Furthermore, it is a galvanized iron material or the like.

In FIG. 1, reference numeral 6 denotes a component made of a durable insulating material, for example, a synthetic resin (hereinafter referred to as a sleeve washer).
It is. As shown in FIG. 2, the sleeve washer 6 has a main body 6a having a circular shape and a hole 6b for bolt insertion at the center thereof. A collar 6c having a downward funnel shape is integrally formed around the hole 6b. Is provided.

In order to attach the door fitting 5 to the door material 1,
A bolt insertion hole 7 is previously drilled in the core material 2 and the door material 1
A stainless steel door fitting or the like 5 is placed on the aluminum surface material 3 stretched on the surface of the above through a sleeve washer 6. Then, it is configured to be fastened with the cap nut 4 'via the metal washer 8.

FIG. 4A shows that when a stainless steel door fitting 5 or a washer 8 is tightened with an iron bolt 4 and a cap nut 4 ′, the stainless steel door fitting 5 or the washer 8 is electrically connected to the aluminum face material 3. Is shown. When the connection portion is covered with ice and snow containing a snow melting agent, electrical conduction is made via ice water containing salt, and spot-like corrosion 10 is generated on the aluminum surface material 3.

FIG. 5 is an explanatory view of the anticorrosion effect of the method of the present invention. As shown in FIG. 5, the electrical contact between the aluminum face material 3 and the bolt 4 is completely prevented by the interposition of the sleeve washer 6 made of a soft resin, and corrosion occurs even when the aluminum face material 3 and the snow containing salt are covered. There is no.

[0014]

According to the present invention, due to the presence of the sleeve washer made of synthetic resin, the stainless steel door fitting and the like are electrically insulated from the aluminum surface material, and the electrical connection state shown in FIG. 4 is eliminated. , Are completely insulated from each other. Therefore, even in a cold region, even if it is covered with ice and snow containing snow melting material, corrosion is completely prevented.

[Brief description of the drawings]

FIG. 1 shows a mounting structure according to the invention.

FIG. 2 is a detailed view of a synthetic resin washer.

FIG. 3 shows an example of a conventional anticorrosion method.

FIG. 4 is an explanatory view of the principle of occurrence of corrosion prevention.

FIG. 5 is an explanatory view of corrosion prevention according to the present invention.

[Description of Signs] 1 Door material (constituting rear door) 2 Door core material (such as plywood) 3 Aluminum surface material with pre-coat 4 Bolt 5 Door metal etc. 6 Sleeve washer 6a Body 6b hole 6c Color 7 Bolt insertion hole 8 Washer 9 bolt hole 10 corrosion

Claims (2)

[Claims] In a door whose surface is covered with an aluminum surface material, when mounting hardware such as a door hinge is mounted with bolts, an insulating material is interposed between the aluminum surface material and the mounting metal, and bolts are tightened. A method for insulatingly mounting a door fitting or the like in a truck. 2. The method according to claim 1, wherein the sleeve washer has a downward funnel-shaped collar around the bolt insertion hole.