JPH04103048U - Explosion-proof container - Google Patents

Abstract

(57) [Summary] [Purpose] To provide safely and inexpensively a pressure-resistant explosion-proof container that satisfies both explosion-proof structure standards and radio equipment regulations, and to shorten delivery times. [Structure] By using a special tool to attach the cover 6 with small special screws 5 to the protective cover 4 surrounding the bolt head 3A or nut of the bolt 3 that constitutes the locking structure of the tightening part, it complies with the explosion-proof construction standards and radio equipment regulations. It is possible to safely and inexpensively provide a pressure-resistant explosion-proof container that satisfies both requirements, and to shorten delivery times.

Description

[Detailed explanation of the idea]

0001

[Industrial application field]

The present invention relates to a pressure-resistant explosion-proof container among electrical equipment having an explosion-proof structure.

0002

[Conventional technology]

The flameproof explosion-proof container according to this invention means that the object (not necessarily an explosive) inside the container Even if there is an explosion, the explosion is contained within the container; is simply a locking structure, and is based on the explosion-proof construction standards for electrical machinery and equipment (1966). There is no problem with the Ministry of Labor Notification No. 16 (2015) [Notification 1.2.3.2 (Lock tightening)].

0003 A locking structure means that the tightening part cannot be loosened without using a special tool. It is applicable when specified as a requirement for explosion-proof structure. It is. For example, the total height of the bolt head or nut at the tightening part and its circumference Protective cover or counterbore surrounding 3 or more areas shall be integrated with the container or removed. Unless you use a special tool that fits the protective cover, etc., and fix it so that it cannot be The purpose of locking is achieved by making it impossible to loosen it.

0004 FIG. 7 is a sectional view showing a first example of the main parts of a conventional container, in which a lid 2 is attached to a container body 1. Tighten with the hexagonal bolt 3, and check the total height of the bolt head 3A at this tightening part and its A protective cover 4 that surrounds more than 2/3 of the circumference and has a protrusion that protrudes from the surface of the lid 2. This is an example in which . Moreover, FIG. 8 is a cross-sectional view showing the second example, and the container main body is A counterbore hole 2A is provided in the lid 2 of the body 1, and the lid is attached to the container body 1 at the center of the counterbore hole 2A. 2 with a hexagonal bolt 3, and the total height of the bolt head 3A and 2/2 of its circumference. This is an example in which the protective cover 4 that surrounds three or more areas is an inner wall formed by counterbore holes 2A.

[0005]

[Problem that the idea aims to solve]

In the above conventional example, there are problems with the explosion-proof construction standards for electrical machinery and equipment regarding explosion-proof construction. However, when accommodating a cordless telephone radio station, Article 49-8 of the Radio Equipment Regulations [General condition C of item 1: 380.2125MHz or more, 381.3125MHz or more Wireless equipment that uses radio waves at lower frequencies is not applicable to telecommunications equipment (limited to telephone lines) Must be able to connect via wired connection line. It is housed in the same housing and can be easily Not being able to open it. ] and special screws are required. Special screws and special tools that are strong enough to maintain flameproof and explosion-proof performance are expensive. Therefore, it is not suitable for applications that require low cost.

[0006]

[Means to solve the problem]

Therefore, the present invention is a small and inexpensive special device that satisfies the examination provisions of the Radio Equipment Regulations. Using screws, tools can be attached to large bolts as general products that can maintain flameproof and explosion-proof performance. The aim is to provide a pressure-resistant and explosion-proof container that cannot be touched. That is, in the container of the present invention, the lid 2 is attached to the container body 1 at multiple locations using bolts 3 or nuts. In a pressure-resistant explosion-proof container made by tightening, the locking structure of at least one tightening part is Use a special tool to attach the bolt head 3A of the constituent bolt 3 or the protective cover 4 surrounding the nut. At least one small special screw 5, which cannot be loosened otherwise, acts as a protective plate. The cover 6 is attached.

[0007]

[Effect]

Because of this configuration, it is a component of the locking structure required by explosion-proof structure standards. Using the protective cover 4, use a small special screw 5 there that complies with the radio equipment regulations. By attaching the cover 6 as a protection plate to the bolt head 3A or nut, The main body 1 and lid 2 are general products with sufficient strength to maintain flameproof and explosion-proof performance. It can be tightened with large bolt 3. To loosen this, use a special tool to loosen it. Loosen the small special screw 5 and remove the cover 6, then tighten the high-strength bolt 3 with a special tool. It will have to be removed.

[0008]

【Example】

FIG. 1(A) shows the structure of the first embodiment of the container of the present invention for accommodating a wireless station of a cordless telephone. FIG. 1(B) is a front view showing the structure, and FIG. 1(B) is a sectional view of the main part thereof. In Figure 1, 1 is the capacity The container body, 2 are hexagonal bolts that constitute the locking structure of the tightening part at four locations on the container body 1. The lid is tightened by 3, and 4 is the total height of the bolt head 3A at this tightening part. A protective cover that surrounds more than 2/3 of the circumference of the lid 2 and has a protrusion that protrudes from the surface of the lid 2. , 8 is an antenna, 9 is a protection tube socket, and 10 is a cable.

[0009] The first embodiment has a locking structure for one tightening part in an explosion-proof container with such a structure. A special tool must be used to insert the protective cover 4 surrounding the bolt head 3A of the hexagonal bolt 3 that makes up the Remove the protective cover 6 with two small special screws 5 that cannot be loosened if the It will be attached.

0010 FIG. 2 is a cross-sectional view of the main parts of the second embodiment, which is similar to the explosion-proof In the container, a counterbore hole 2A is provided at one location on the surface of the lid 2, which constitutes the locking structure of the tightening part. At the center of this counterbore hole 2A, attach the lid 2 to the container body 1 with a hexagonal bolt 3. A protective cover is provided by the inner wall of the counterbore hole 2 that surrounds the bolt head 3A of this hexagonal bolt 3. Attach the cover 6 as a protective plate to 4 using the same two small special screws 5 as above. Become.

The small special screw 5 of the first and second embodiments may be a screw having a reamed hole 5B with a center boss 7 on the top surface of the screw head 5A as shown in FIGS. As shown in FIG. 6, a screw having a reamed hole 5B without a center boss on the upper surface of the screw head 5A can be used. The diameter d ₁ of the screw head 5A of the special pick 5 used in the first embodiment is 5.8 mm, the height h ₁ = 2.2 mm, the length of the thread portion l ₁ = 6 mm, the screw diameter m ₁ = 3 mm, and the reamed hole. 5B, the distance between the opposing recesses h ₁ =3.1 mm, and the width of the recess a ₁ =0. It is 6mm. The diameter d ₂ of the screw head 5A of the special screw 5 used in the second embodiment is 4.3 mm, the height h ₂ = 1.8 mm, the length l ₂ of the threaded portion = 14 mm, and the screw diameter m ₂ = 2. 6 mm, the distance b ₂ between the opposing recesses of the reamed hole 5B = 2 mm, and the width of the recess a ₂ = 0.5 mm.

0012 The thickness a and width b of the tip of a screwdriver according to JISB4609 are as shown in Table 1 below. be.

[0013]

[Table 1]

The tip of the special screw 5 and its driver used in this embodiment has a thickness a ₁ =0.6 mm, a width b ₁ =3.1 mm, or a ₂ =0.5 mm, and a width b ₂ =2 mm. , there is no one that matches the values of thickness a and width b shown in Table 1 above, and it is enough to play the role of the special screw 5 and the special tool (driver). Note that the screwdriver for the special screw 5 shown in FIG. 3 has a hole into which the center boss 7 is inserted, and although it is somewhat expensive, it is preferable as a special tool.

[0015] The first and second embodiments described above are a component of the locking structure required by the explosion-proof structure standard. Attach the protective cover 4 to the bolt head 3A using a small special screw 5 that complies with radio equipment regulations. By installing the cover 6 as a protective plate, the container body 1 and lid 2 are made flameproof and explosion-proof. Tighten with a large hex bolt 3 that is a general item and has sufficient strength to maintain its function. can be done. To loosen this, use a special screwdriver to loosen the small special screw 5. Remove the cover 6, and then remove the high-strength hex bolt 3 with a special screwdriver. It turns out.

[0016] In the present invention, a nut is tightened on a screw installed in the container body 1 instead of the bolt 3. Of course, the lid 2 may be attached to the container body 1.

[0017]

[Effect of the idea]

As described above, according to the present invention, the lid 2 is attached to the container body 1 by bolts 3 or nuts at multiple locations. In a flameproof explosion-proof container that is tightened by A special protective cover 4 surrounding the bolt head 3A or nut of the bolt 3 constituting the locking structure is At least one small special screw 5 that can only be loosened with a special tool Since the cover 6 is attached as a protection plate, the bolts that constitute the locking structure of the tightening part are Attach the cover 6 with a small special screw 5 to the protective cover 4 surrounding the bolt head 3A or nut of 3. By installing it with special tools, it will comply with the explosion-proof structure standards for electrical machinery and equipment. A pressure-resistant explosion-proof container that satisfies both radio equipment regulations and expensive special screws and special tools. There is no need to use a I can do it.

[Brief explanation of drawings]

FIG. 1 (A) is a front view showing the structure of a first embodiment of the container of the present invention for accommodating a wireless station of a cordless telephone, and (B) is a sectional view of the main part thereof.

FIG. 2 is a cross-sectional view of the main parts of the second embodiment.

FIG. 3 is a plan view showing a first example of a small special screw used in the container of the present invention.

FIG. 4 is a side view of the same.

FIG. 5 is a plan view showing a second example of a small special screw used in the container of the present invention.

FIG. 6 is a side view of the same.

FIG. 7 is a sectional view showing a first example of the main parts of a conventional container.

FIG. 8 is a sectional view similarly showing a second example.

[Explanation of symbols]

1 Container body 2 Lid 2A counterbore 3 (hexagonal) bolt 3A bolts 4 Protective cover (projection, inner wall with counterbore hole 2A) 5 Small special screw 5A screw head 5B Reamer hole 6 Cover as a protective plate 7 Center boss

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[Procedural amendment]

[Submission date] June 24, 1991

[Procedural amendment 1]

[Name of document to be corrected] Drawing

[Correction target item name] Full map

[Correction method] Change

[Correction details]

[Figure 1]

[Figure 2]

[Figure 3]

[Figure 4]

[Figure 5]

[Figure 6]

[Figure 7]

[Figure 8]

Claims (3)

[Scope of utility model registration request] Claim 1: In a pressure-resistant and explosion-proof container in which a lid (2) is fastened to a container body (1) at a plurality of locations using bolts (3) or nuts, the bolts ( Attach a cover (6) as a protective plate to the protective cover (4) surrounding the bolt head (3A) or nut in 3) with at least one small special screw (5) that can only be loosened with a special tool. A pressure-resistant explosion-proof container. [Claim 2] The protective cover (4) is characterized in that it is a protrusion projecting on the surface of the lid (2) or a hole wall formed by a counterbore (2A) provided on the surface of the lid (2). The pressure-resistant explosion-proof container according to claim 1. [Claim 3] The small special screw (5) has a screw head (5A)
2. The pressure-resistant explosion-proof container according to claim 1, which is a screw having a reamed hole (5B) with or without a center boss (7) on the upper surface of the container.