JPS5911150Y2 - Connection structure of handrail cap - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a connection structure in a handrail cap, which is constructed by joining at least two metal pipes together.

Conventionally, when installing long handrails, it is difficult to transport long handrails that have been preassembled at a factory etc. to the site, so handrail sections of a predetermined unit length are transported to the site in pieces. , which are connected, assembled and installed on-site.

This handrail joint assembly is usually done by welding, or by placing a tubing inside the two pipes that extends over the two pipes to be joined, and screwing or pinning each of the two pipes to the tubing. is being carried out.

Handrails must be painted, but if welding, screwing, or pinning are used to join two pipes together as described above, if you apply the paint first, it may stain the paint during the joining process. Since the paint will peel off, it must be painted after the handrail installation is complete.

Therefore, in such a case, there is a drawback that there is a lot of work to be done on site, and painting such as plating is not possible.

Furthermore, the pipes used in the handrail framework are usually not internally painted to reduce costs, and since these handrails are often installed outdoors, such as on balconies, it is difficult to assemble and connect the handrails. When the above screws and pins are used, there is a drawback that rainwater etc. can enter the interior through the small gap between the internal tubular material and the pipe, causing rust from the inside.

In addition, due to the circulation of air inside the tube, rust may occur from the inside of the tube.

The purpose of this invention is to facilitate pipe connection work, prevent water from entering through the joints, keep the inside of the pipe airtight, and prevent damage to the pre-painted paint on the pipes during the connection work. Our goal is to provide flawless pipe fittings.

The above-mentioned object of the present invention is to arrange an air seal made of foam, a female cam nong and a male twist ring constituting a bayonet-like joint at the ends of two pipes to be joined, and to connect these two pipes. This is achieved by pressing and clamping a donut-shaped plate-shaped elastic body between the ends of the two tubes when they are butted and connected.

In other words, the connection structure of the handrail cap according to the present invention consists of two pipes that are joined together, a female cam ring fixed to the end of one of the pipes, and a female cam ring fixed to the end of one of the pipes to keep the inside of the one pipe airtight. a first sealing body made of foam provided inwardly of the female cam ring inside the tube; a male twist having a protrusion fixedly attached to the other tube that engages with the cam of the female cam ring; a ring, a second sealing body made of a foam provided inwardly of the male twist ring inside the other tube to keep the inside of the other tube airtight, and the ends of the two tubes to be joined together. The cam ring is made of a donut-shaped plate-shaped elastic body having an outer diameter approximately equal to the outer diameter of the tubes arranged between the sections, and the cam of the cam ring is spirally twisted and inclined, and the twisted ring is connected to the tube along with the cam ring. When rotated relative to the cam ring, the ends of the two tubes are watertightly joined together with the plate-like elastic body being pressed and clamped between the ends of the two tubes. .

Hereinafter, preferred embodiments of the connection structure of the handrail cap according to the present invention will be described with reference to the accompanying drawings.

FIG. 1 is a diagram showing a state in which a handrail is assembled by connecting metal pipes forming a handrail cap 2 using a pipe joint 1.

This pipe joint 1 connects two adjacent pipes 3A to be joined.
It has a female cam ring 4 attached by welding or the like inside the end of 3B, and a male twist ring 5 fitted to this cam ring 4 (see FIGS. 2 and 3).

As shown in FIG. 4, the cam ring 4 has a donut-shaped flange 6 protruding inwardly from its peripheral wall at the end closer to the tube 3B, and this flange 6 has an equal diameter in the circumferential direction. There are three spaced apart recesses 7 extending radially outward from the inner circumferential end.

The remainder of the flange therefore forms a cam 8 which is a protrusion.

This cam 8 is helically twisted and inclined, ie propeller-shaped.

On the other hand, the twist ring 5 is composed of a cylindrical portion 5A having an outer diameter slightly smaller than the inner diameter of the flange described above and a cylindrical portion 5B having an outer diameter equal to the inner diameter of the tube 3B. The shaped portion 5A can be fitted into a hole in the flange.

Further, as shown in FIG. 5, the cylindrical portion 5A of the twist ring is provided with the same number of protrusions 9 as the above-mentioned recesses, that is, three protrusions 9 extending radially outward from its outer periphery.

The protrusion 9 may be formed by making a cut in the cylindrical wall of the twist ring 5 and folding the cut portion outward as shown in the figure.

This protrusion 9 is smaller than the recess, and when the ends of the two pipes are butted together when joining the two pipes,
It is possible to pass through the recess 7 and slightly beyond the flange 6.

The twist ring 5 is attached by welding or the like inside the end of the tube 3B at a cylindrical portion 5B having an outer diameter approximately equal to the inner diameter of the tubes to be spliced.

The tubes 3A, 3B, cam ring 4, and twist ring 5 are all made of metal such as steel.

Between the protrusion 9 of the twist ring 5 and the end surface 11 of the cylindrical portion 5B, there is provided a donut-shaped plate-shaped elastic body, ie, a packing 12, made of a weather-resistant elastic material such as silicone rubber or neoprene rubber. There is.

The outer diameter of this packing 12 is preferably equal to or slightly larger than the outer diameter of the pipes to be spliced.

This is to prevent the ends of two pipes from touching each other when joining them together, and to prevent rainwater, dust, etc. from accumulating in the joint after joining. .

In addition, the cam ring 4 has, as shown in FIGS. 2 and 4, in order to support the tip of the twist ring 5.
Preferably, an inwardly projecting support projection 13 is provided.

Inside near the ends of the tube 3A to which the cam ring 4 is attached and the tube 3B to which the twist ring 5 is attached,
Airtight foam 14A and 14B such as hard urethane foam
is provided.

The foam members 14A and 14B are used to keep the insides of the tubes 3A and 3B airtight, eliminating air circulation and thereby preventing the tubes from rusting from the inside.

These foams are preferably two-component, and after the cam ring 4 and twist ring 5 are attached to the ends of the tubes 3A and 3B, the two-component foaming agent is injected into the tube from the openings of the cam ring and twist ring. It is provided by injecting.

To join two pipes together using the pipe joint of the present invention, first, the ends of the two pipes are aligned in a straight line, and the ends of the two pipes are butted together with the packing 12 interposed.

At this time, the protrusion 9 of the twist ring 5 passes through the recess 7 of the flange 6 of the cam ring 4 and is disposed at a position slightly beyond this flange.

After that, the tubes 3A and 3B are relatively rotated about 60 degrees in opposite directions, and the protrusion 9 of the twist ring 5 is attached to the cam cylinder 4.
(see FIG. 6) on the twisted and inclined cam 8 of the flange 6 of the flange 6 (see FIG. 6), whereby the two tubes are drawn together by the action of the inclined surface of this cam and a tight connection is established between them.

At this time, the supporting protrusion 13 of the cam ring 4 also contacts the tip of the cam tongue 5 to support it.

Also, since the two tubes are drawn toward each other, the packing 12 placed between them is pressed and clamped to keep the joint between the two tubes water-tight.

In the above description of the embodiment, the cam ring flange has three recesses and the twist ring has three protrusions, but at least two recesses can serve the purpose.

However, in practice, if there are three or more, the connection will be more reliable and the packing effect will be sufficient.

Note that the connection structure of the present invention may be such that a cam ring is provided at one end of one tube and a twist ring is provided at the other end for sequential connection. A tube having cam rings at both ends may be interposed between two tubes having cam rings at both ends, and the three tubes may be connected simply by rotating this central tube.

As explained above, if the joint structure of the present invention is used when joining pipes together, the joining operation becomes extremely simple.

During the connection work, a plate-shaped elastic body made of silicone rubber or the like is always interposed between the ends of the two pipes, so these ends do not come into direct contact with each other. .

Therefore, even if the tube is pre-painted, it will not be stained or peeled off, so the tube can be painted at the factory and only assembly and installation work needs to be done on-site.

Furthermore, since this plate-like elastic body keeps the joint between the two pipes together liquid-tight, rainwater and the like will not enter the inside of the pipe, and therefore the inside of this pipe will not rust.

Furthermore, since the inside of the connected pipe is kept airtight by the sealing body, air does not flow into the inside of the pipe, thus further preventing rust from inside the pipe.

The lifespan of handrails installed outdoors is thus significantly extended.

[Brief explanation of the drawing]

Fig. 1 is a front view showing a handrail assembled using the joint structure of the present invention, Fig. 2 is a longitudinal sectional view of the joint structure of the present invention, and Fig. 3 is a line A in Fig. 2. - Sectional view along A, 4th
5 is a perspective view of a cam ring, which is one component of the pipe joint used in the connection structure of the present invention. FIG. 5 is a perspective view of a twist ring, which is another component of the pipe joint. 6 is a sectional view taken along line BB in FIG. 3. 1...Pipe fitting, 2...Handrail, 3A, 3
B...Pipe, 4...Cam ring, 5...
...Twist ring, 6...Flange, 7
... recess, 8 ... remaining protrusion,
9...Protrusion, 12...Plate-shaped elastic body, 1
4A, 14B... Sealed body.

Claims (1)

[Scope of utility model registration request] In the connection structure of a handrail cap made by joining at least two metal pipes, a female cam ring fixed to one end of the two pipes to be joined together, a female cam ring fixed to one end of said one pipe; A first sealing body made of foam is provided inward from the female cam ring inside the tube to keep the interior airtight, and has a protrusion that engages with the cam of the female cam ring; a male twist ring fixed to the end of the tube, and a second sealing body made of a foam provided inside the other tube inwardly from the male twist ring to keep the inside of the other tube airtight. , and a donut-shaped plate-shaped elastic body having an outer diameter approximately equal to the outer diameter of the two pipes disposed between the ends of the two pipes to be joined, and the cam of the cam ring is arranged in a spiral shape. The twisted ring is twisted and inclined, and when the twisted ring is rotated with the tubes relative to the cam ring, the ends of the two tubes are bent while the plate-like elastic body is pressed between the ends of the two tubes. The joint structure of the handrail cap is characterized by watertight joints.