JPH10245904A - Pin for fixing covering material - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve the current efficiency during welding, and to safely and surely fix a heat insulation material and a sound insulation material by covering a lower side of a countersunk part of a pin for fixing a covering material and an upper part of a shaft part with the insulation material. SOLUTION: A pin 1 for fixing a covering material comprises a shaft part 2 and a countersunk part 3 which is integratedly fixed to an upper end part of the shaft part 2. A lower side of the countersunk part 3 and an upper part of the shaft part 2 are covered with a insulation material 10. A heat insulation material 30 is covered over the outer surface of a metallic plate 20a which is an external facing of a duct 20, the fixing pin 1 is directly inserted in appropriate parts and bonded to the metallic plate 20a, and welded in the pressed condition. Even when the heat insulation material 30 is covered with aluminum material and is electrically conductive, no current flows in the insulation material 30, and the heat insulation material 30 can surely be fixed with excellent current efficiency.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a fixing pin used for covering a steel frame of a building or an outer surface of a mechanical facility with a covering material such as a heat insulating material and a soundproofing material.

[0002]

2. Description of the Related Art In the case of covering a steel frame of a building or an outer surface of mechanical equipment with a covering material such as a heat insulating material, conventionally, a fixing member such as a stud bolt is welded to the steel frame, and the covering material is covered thereon. A method has been adopted in which a fixing member is inserted and a nut and a washer are screwed and fixed to a stud bolt as the fixing member.

In addition, there is also a method in which a refractory material is first applied to the surface of a steel frame, and pins or stud bolts are inserted from the outside of the refractory material and fixed by welding. In order to improve the weldability at this time, a welding gun is used. A method of improving conductivity by pressing and rotating a pin or the like to partially remove an oxide film, a paint film, or the like on the surface of a steel material has been proposed (Japanese Patent Publication No. Hei 6 (1994)).
-72465).

By the way, in the method of inserting a fixing pin from above the covering material placed on the metal base and fixing it by welding to the base, when the covering material is made of a conductive material such as an aluminum sheet, Since the current flows through the coating material, the current efficiency at the time of welding is poor, and there is a problem that it is dangerous because electric leakage occurs between the conductive materials.

[0005]

In order to solve the above-mentioned problem, a pin having an insulating coating on its outer peripheral surface over the entire length of the shaft has been considered, but the lower end of the shaft has a coating. For this reason, a pin that interferes with welding and has a dish portion integrally provided on the head has a sufficient effect because the current escapes due to the contact between the lower surface of the dish portion and the covering material. Accordingly, an object of the present invention is to provide a fixing pin capable of securely and efficiently fixing a covering material by eliminating waste of current at the time of welding the above-mentioned conventional covering material fixing pin.

[0006]

In order to solve the above problems, the present invention employs the following configuration. That is, the coating material fixing pin according to the present invention includes a shaft portion and a plate portion integrally provided at an upper end portion of the shaft portion, and a lower surface of the plate portion and an upper portion of the shaft portion are covered with an insulating material. It is characterized by having.

[0007]

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, embodiments of the present invention will be specifically described with reference to examples. The figure shows an example of the present invention. The covering material fixing pin 1 includes a shaft portion 2 and a plate portion 3 fixed to an upper end portion of the shaft portion. Shaft 2
Has a pointed lower end, and a small-diameter disk-shaped head 4 is integrally formed at the upper end.

The dish portion 3 has a slanted surface portion 6 formed on the periphery thereof so as to open outward, and a concave portion 7 which is slightly depressed in the center. Further, the shaft portion 2 is inserted into the center of the concave portion 7, and the head portion 4 is caulked with the head portion 4 in close contact with the concave portion 7. Thus, the shaft portion 2 and the dish portion 3 are fixedly integrated so that the upper surface of the head 4 is substantially in the same plane as the flat upper surface 3a of the dish portion 3.

The fixing pin 1 has a lower surface of the plate portion 3 and an upper portion of the shaft portion 2 covered with an insulating material 10. In the illustrated example, the length of the insulating coating of the shaft portion 2 is approximately の of the entire length, but this ratio may be appropriately changed depending on the use conditions, dimensions, and the like.

The material of the insulating material 10 may be any material having an insulating property and an appropriate heat resistance, and a synthetic resin such as nylon having these properties can be used. For example, in the illustrated example, nylon 6 is used, and the flammability of this nylon 6 is UL94 V-2 (flame retardant class 2), the heat deformation temperature is 4.6 kg / cm, and is 180 ° C. ,
It is preferable because there is no problem in availability. As for the temperature condition, it is possible to withstand the temperature up to 240 ° C. by selecting the material.

The coating layer of the pin 1 of the illustrated example with the insulating material 10 is formed continuously from the back surface (lower surface) of the dish portion 3 to the intermediate portion of the shaft portion 2. And the insulating coating layer of the shaft part 2 is
The thickness of the lower end portion is small, and the thickness increases as the position increases, and the outer diameter of the coating layer is small at the bottom and large at the top, and has a wedge-shaped cross section as a whole.

As shown in FIG. 6, for example, the fixing pin 1 is provided on the outer surface of a metal plate 20a of a duct 20 with a heat insulating material 30 made of inorganic fiber or the like (in the illustrated example, made of aluminum coating, glass wool or the like). Is used for fixing the cover. Describing the procedure, first, the duct 20
The heat insulating material 30 is put on the outer surface of the metal plate 20a which is the exterior material of the above, and fixing pins are directly inserted into appropriate places of the heat insulating material to adhere to the metal plate 20a. Therefore, the operation is simple.

In this way, the fixing pin 1 is inserted while the hole h is made in the heat insulating material, and the fixing pin 1 is welded while being pressed against the metal plate 20a. By this operation, the lower end portion of the pin 1 and the metal plate 20a are welded and integrated with the dish portion 3 sunk into the heat insulating material surface, and the heat insulating material 30 is firmly fixed to the metal plate 20a. At the time of this welding, since the lower surface of the dish portion 3 and the upper portion of the shaft portion 2 are covered with an insulating material, even if the heat insulating material 30 is covered with an aluminum material or the like and has electrical conductivity, the heat insulating material is not covered with the insulating material. There is no outflow of current and efficiency is high. In addition, since the shaft lower portion 2a to be welded to the metal base is not provided with an insulating coating, it does not hinder welding.

Further, since the upper portion of the shaft portion 2 of the pin in the illustrated example is formed in a wedge-like shape with a pointed lower portion by an insulating coating layer, a force for pushing and opening the heat insulating material 30 acts, and a smooth work can be performed. After welding, the wedge-shaped shaft portion presses the heat insulating material, so that the adhesion to the heat insulating material is high, and secure fixing can be obtained.

[0015]

As is apparent from the above description, the coating material fixing pin according to the present invention comprises a shaft portion and a plate integrally provided at the upper end of the shaft portion. Since the lower surface and the upper portion of the shaft portion are covered with the insulating material, the current efficiency during welding is good, and the heat insulating material can be securely fixed. It goes without saying that this fixing pin can be used for fixing a coating material other than the heat insulating material.

[Brief description of the drawings]

FIG. 1 is a front view of a fixing pin.

FIG. 2 is a plan view thereof.

FIG. 3 is a bottom view thereof.

FIG. 4 is an enlarged sectional view of the upper part.

FIG. 5 is an overall vertical sectional view.

FIG. 6 is an explanatory diagram of a method of use.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Fixing pin 2 Shaft part 2a Shaft lower part 3 Plate part 10 Insulation material (insulation coating) 20 Duct 20a Metal plate (base) 30 Insulation material

Claims (1)

[Claims] 1. A pin for fixing a coating material on a surface of a metal material, comprising a shaft portion and a plate integrally provided at an upper end of the shaft portion, wherein a lower surface of the plate portion and a shaft are provided. A pin for fixing a covering material, wherein an upper portion of the portion is covered with an insulating material.