JP2000120245A - Protection fence rod of spiral staircase - Google Patents

Abstract

PROBLEM TO BE SOLVED: To fix a pipe to an intermediate sleeve without necessitating an adhesive by fitting the intermediate sleeve at both the ends of the flange of a joint member having a flange formed at the center of the longitudinal direction, and also fitting a metal continuous pipe having the same outer diameter as the flange in close relation in the outer circumference of the intermediate sleeve. SOLUTION: Steps are fastened spirally around a piller set up at the center, and protection fence rods 3 are fixed on the outer periphery of the steps in a manner making narrow distances in the circumferential direction, and allowing them to be pierced in the vertical direction one by one. Next, during joint operation, an intermediate sleeve 6 with a number of vertical grooves 7 formed thereon is fitted in the outer circumference of a metal joint member 4 such as copper or aluminum having a circular flange 5 formed at the center in the longitudinal direction. At that time, the circumference of the intermediate sleeve 6 is made of synthetic resin or synthetic rubber of elasticity. A metal pipe 8 of the same outer diameter as the flange 5 and smaller inner diameter than the outer diameter of the intermediate sleeve 6 is fitted in the circumference of the intermediate sleeve 6 by giving elastic deformation. This dispenses with the use of a welding machine or application of an adhesive, as a result, pipes can be joined to each other promptly at a site.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a long rod which is fixed circumferentially at intervals as a protective fence around a step of a spiral staircase.

[0002]

2. Description of the Related Art Since a bar for a protective fence of a spiral staircase has a length of 10 m or more, it is cut into several meters at a time for convenient transportation and connected by welding at a site, but it is easy to weld straight. In addition, there is a problem that the welding machine must be brought to the site, the working efficiency is low, and rust is generated at the welding location.

[0003]

The problem to be solved by the present invention is to provide a bar for a spiral staircase which can be easily connected on site.

[0004]

Means for Solving the Problems, Functions and Effects As a means for solving such problems, the protection fence rod of the spiral staircase according to the first aspect of the present invention has a circular shape substantially at the center in the longitudinal direction. Because the cylindrical intermediate cylinder was tightly fitted to both sides of the flange of the connecting member forming the flange, and a long metal pipe having the same outer diameter as the flange was tightly fitted to the outer peripheral portion of the intermediate cylinder. Thus, there is an effect that pipes can be quickly connected on site without using a welding machine. According to the invention of claim 2, at least the outer peripheral portion of the intermediate cylinder has elasticity in the invention of claim 1. ,
Since the pipe is fitted with the elastic deformation of the intermediate cylinder, there is an effect that the pipe can be fixed to the intermediate cylinder without using an adhesive.
In the invention of the second aspect, since a large number of grooves in the length direction are formed on the outer periphery of the intermediate cylinder, the outer peripheral portion is easily elastically deformed even if a somewhat hardened material is used for the intermediate cylinder, so that pipe connection work is difficult. This has the effect of being easier.

[0005]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below with reference to the accompanying drawings. FIG. 1 shows a spiral staircase, in which a step 2 is fixed in a spiral around a column 1 erected in the center, and a bar 3 for a protective fence according to the present invention is provided on the outer periphery of the step 2 in the circumferential direction. Are fixed at a narrow interval and are passed one by one in the vertical direction.

As described above, since the rod 3 is extremely long, it is divided into a plurality of rods for convenience of transportation, and is connected to one rod at the site.

The connecting structure is as shown in FIGS. 2 to 4, and a large number of metal connecting members 4 such as steel or aluminum having a circular flange 5 formed in the center in the longitudinal direction are provided with a large number of connecting members. An intermediate cylinder 6 made of synthetic resin or synthetic rubber having at least an outer peripheral portion having a vertical groove 7 and having elasticity is tightly fitted, and the outer diameter is the same as the flange 5 and the inner diameter is larger than the outer diameter of the intermediate cylinder 6. A slightly small metal pipe 8 made of steel or aluminum or the like is fitted to the outer peripheral portion of the intermediate cylinder 6 by causing elastic deformation.

Since the outer diameter of the pipe 8 and the outer diameter of the collar 5 are the same, the connection is smooth and looks as if it were a single rod.

The intermediate cylinder 6 may be fixed by applying an adhesive between the connecting member 4 and the pipe 8, but is not necessary when a sufficient coupling force can be obtained only by the frictional force.

The vertical groove 7 on the outer peripheral surface of the intermediate cylinder 6 is for increasing the elasticity of the outer peripheral portion, and is not always necessary depending on the material.

[Brief description of the drawings]

FIG. 1 is a partially cutaway side view of a spiral staircase showing a use state of an embodiment of the present invention.

FIG. 2 is an exploded perspective view of one embodiment of the present invention.

FIG. 3 is a longitudinal sectional view thereof.

FIG. 4 is a sectional view taken along line AA of FIG. 3;

[Explanation of symbols]

 4: Connecting member 5: Tsuba 6: Intermediate cylinder 7: Vertical groove 8: Pipe

Claims (3)

[Claims] 1. A cylindrical intermediate cylinder is tightly fitted on both sides of a flange of a metal connecting member having a circular flange formed at a substantially central portion in a longitudinal direction, and has the same outer diameter as the flange. A protective fence rod for a spiral staircase, wherein a long metal pipe is tightly fitted to an outer peripheral portion of the intermediate cylinder. 2. The protective fence for a spiral staircase according to claim 1, wherein at least an outer peripheral portion of the intermediate cylinder has elasticity, and the pipe is fitted with elastic deformation of the intermediate cylinder. rod. 3. The bar for a fence of a spiral staircase according to claim 1, wherein a number of longitudinal grooves are formed on an outer periphery of the intermediate cylinder.