JPH0334545Y2 - - Google Patents

Description

[Detailed description of the invention] [Industrial application field] The invention is suitably used as a fluid supply hose for coating equipment, and can be easily attached to and removed from objects to be bonded, and can be reliably connected to objects to be bonded. This invention relates to a conductive hose with a fitting that can be electrically connected to the electrically conductive hose.

[Background technology]

For example, hoses used in painting equipment, especially spray air supply hoses connected to spray guns,
Static electricity is likely to be generated naturally in paint feeding hoses and the like during spraying work, sometimes resulting in electric shock to workers and spark discharge to objects to be painted.

On the other hand, due to the nature of this type of spraying work,
Flammable agents such as thinner are widely used as paint solvents and cleaning agents, and therefore, such spark discharges can lead to accidents such as fires, and various ways to prevent them are being studied.

In order to prevent such spark discharge, conventionally, a hose with a conductive material embedded in it made of braided stainless steel wire has been used, and continuity has been established by bringing the conductive material covering the end of the hose into contact with a fitting. However, when braiding stainless steel wire, it takes time to process the ends, and the conductivity is incomplete, and sometimes when paint adheres to the fittings, the conductive material and the fittings may not be conductive. There was also the problem of not having one.

[Purpose of invention]

The present invention is based on the fact that the protruding part of the coil body to be embedded in the base pipe and the extension part of the joint tube to be inserted into the base pipe are pressed together using fastening metal fittings, and it is possible to attach and remove the parts to be joined. The object of the present invention is to provide a conductive hose with a joint that can be easily and reliably connected to an object to be connected and that can solve the above-mentioned problems.

[Disclosure of invention]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An example in which the electrically conductive hose 1 with a joint of the present invention is used as a spray air supply hose for a coating device will be explained based on the drawings.

In the figure, a conductive hose 1 with a joint includes a hose body 7 in which a coil body 3 is inserted over the entire length into the circumferential wall of a flexible base pipe 2 and a protruding portion 6 is provided at an end portion 5, and the hose body a coupling tube 15 having a locking portion 13 for holding a coupling tube 12 via an extension portion 11 on an insertion portion 10 that can be inserted into the end portion 9 of the tube; It consists of a fastening fitting 16 to be attached.

As shown in FIGS. 1 and 2, the hose body 7 includes a base pipe 2 made of a flexible material such as vinyl chloride, urethane rubber, polyamide resin, polyacetal resin, etc., and a metal wire such as copper wire. By integrally molding the base tube 2 and the coil body 3, the coil body 3 is provided within the inner wall of the base tube 2 over the entire length of the base tube 2. Embed across.

The coil body 3 is arranged with its helical center aligned with the center of the base tube 2, and is embedded uniformly without exposing the coil body 3 from the inner wall. A protruding portion 6 protruding from the end face is formed.

Note that such a hose body 7 can be easily obtained by requesting it from a commercial product.

Further, a joint tube 15 is attached to the end portion 9 of the hose body 7.

The joint cylinder 15 is a metal cylinder having a center hole 20, and in this example, the peripheral surface is formed with a multi-stage taper, and the maximum diameter of the taper is preferably approximately the same diameter as the inner hole 21 of the base cylinder 2. Insertion section 10 with a slightly larger diameter
, an extension part 11 extending from the insertion part 10 and having approximately the same length as the protruding part 6, and a flange part 13A extending from the extension part 11 and engaging with the coupling tube 12.
A locking portion 13 having a locking portion 13 is provided.

Therefore, in the joint tube 15, the insertion portion 10 can be inserted into the inner hole 21 of the end portion 9 of the base tube 2 in a substantially press-fitting manner, and in this case, the protruding portion 6 is arranged along the extension portion 11 and overlapping vertically. be done.

In this example, the joint tube 12 is a well-known nut fitting having an engaging collar 27 protruding toward the center at one end of a base body 26 provided with an internal thread 25. By inserting
The flange portion 13A of the locking portion 13 and the engagement flange 27 engage with each other, so that the locking portion 13 allows the joint tube 15 to hold the joint tube 12 so that it cannot fall out. In addition, in this example, the joint tube 15 is provided with a tapered slope 29 at the tip of the locking portion 13, and the extension portion 11 is formed to have a diameter slightly larger than the maximum diameter of the insertion portion 10, so that the extension portion 11 of the hose body 7 Prevent insertion into.
Further, a fastening fitting 16 is attached to the extension part 11.

In this example, the fastening fitting 16 is made of an elastic metal material, and has protrusions 31, 31 at both ends of a cylindrically curled base body 30 that intersect with each other.
surrounds the extension part 11 and presses the extension part 11
is fitted into the Therefore, the fastener 16 is connected to the extension part 1
The protruding portions 6 arranged vertically and overlappingly along the coil body 1 can be pressed against the extension portion 11, and the coil body 3 and the joint tube 15 can be reliably electrically connected.

Note that the fastening fitting 16 can push open the base body 30 by bringing the protrusions 31, 31 closer together, and can be attached to the extension part 11.

Further, the fastening fitting 16 may be formed using metal wire such as piano wire or stainless steel wire.

Note that a hose fixing hardware 33 such as a fastening band is attached to the hose body 7, and the hose body 7 is attached to the insertion portion 10.
The hose body 7 is fixed by being pressed against it and clamped between it and the insertion portion 10 to prevent the hose body 7 from falling off, and the hose fixing hardware 33 is removable.

In this example, the electrically conductive hose 1 with a joint is connected at one end to a spray air nipple 35 of a painting spray gun G via a joint tube 12, and at the other end to an air purifier, as shown in FIG. It communicates with a pressurizing device P via a cleaner C and a regulator R for adjusting air pressure. The connection is achieved by screwing the coupling tube 12 and the nipple 35 together, and by press-contacting the inner hole end of the nipple 35 with the slope 29 at the tip of the locking part 13, thereby establishing an airtight and electrically conductive connection. Therefore, the joint tube 12
can also be formed from a non-conductive material such as synthetic resin.

[Effect]

However, the conductive hose 1 with a joint of the present invention has a third
As shown in the figure, one end is connected to a spray gun G for spraying paint, and the other end is connected to a cleaner C. Further, the regulator R and the pressurizing device P are connected by joint conductive hoses 1A and 1B having the same configuration, and the spray air generated by the pressurizing device P is sent to the spray gun G. Also, the spray gun G has a conductive hose 1, 1 with a fitting.
A, 1B, the cleaner C, the regulator R, and the pressurizing device P are grounded, and therefore static electricity generated in the hose body 7 due to dragging and passage of the blowing air, and furthermore, the flow path of the spray gun G. Static electricity, etc. generated in the process can be released to the outside of the device, and spark discharge can be prevented from occurring. Also conductive hose with fitting 1,1
Since A and 1B can hold the joint tube 15 for coupling so that it cannot fall out, they can be easily attached to and detached from objects to be coupled such as the spray gun G, cleaner C, regulator R, pressurizing device P, etc. Furthermore, in the conductive hoses 1, 1A, and 1B, the protruding portion 6 of the coil body 7 is pressed and fixed to the extension portion 11 by the fastening fitting 16, so that it is not affected by paint adhesion after the fastening fitting 16 is attached. , conduction can be ensured. The conductive hose 1 with a joint is connected between the spray gun G and the cleaner C, and the main body of the cleaner C is grounded, as shown by the dashed line in FIG. It is also good to connect with a normal insulating hose. Further, the electrically conductive hose 1 with a joint may be used as a paint supply hose, as shown by the two-dot chain line in FIG. 3, or may be used in combination with an air supply hose for spraying. When using a solvent-based paint, the base tube 2 is preferably made of a polyamide resin such as nylon, and those made of vinyl chloride or polyurethane are sometimes attacked by the solvent-based paint.

[Effect of idea]

As mentioned above, the conductive hose with a joint of the present invention is designed to connect the coil body and the joint by pressing the protruding part of the coil body embedded in the base pipe to the extension part of the joint tube inserted into the base pipe using a fastening metal fitting. The connection between the joint tube and the tube is ensured, and since the joint tube can hold the coupling tube so that it cannot fall out, it can be easily attached to and removed from the object to be connected.

In addition, when a conductive hose with a joint is used as a spraying air supply hose and/or a paint supply hose for a coating equipment, it can reliably release static electricity that is naturally generated during spraying work to the outside of the equipment, and prevent static electricity from being caused by static electricity. It is possible to prevent spark discharge that would otherwise occur and improve the safety of spraying work.

[Brief explanation of the drawing]

Fig. 1 is a sectional view showing one embodiment of the present invention;
The figure is an exploded perspective view, and FIG. 3 is a schematic diagram showing a coating apparatus using an embodiment of the present invention. 2...Base tube, 3...Coil body, 5...End part, 6
...Protruding part, 7...Hose body, 9...End part,
10...Insertion part, 11...Extension part, 12...Joint tube, 13...Locking part, 15...Joint tube, 16...
Fastening fittings.

Claims (1)

[Scope of utility model registration request] A coil body in which a metal wire is spirally wound within the peripheral wall of a flexible base tube is embedded over the entire length with the center of the spiral aligned with the center of the base tube, and the metal wire protrudes from the end surface of the base tube at the end. A hose body provided with a protruding part of the wire, and a lock that prevents a coupling tube from falling off through an extension part that is approximately the same length as the protruding part and an insertion part that can be inserted into the end of the hose body. and a fastening fitting which surrounds the extension part and is attached to the extension part in an elastic manner to press the protruding part to the extension part, and the hose body is fixed to the hose fixing hardware. A conductive hose with a joint fixed to the insertion portion.