JPS5944217B2 - Handrail connection method - Google Patents

Abstract

PURPOSE:To prevent the generation of zigzag and disturbance of code pitches by a method wherein only lap sections of tension members are connected by vulcanization through an unvulcanized rubber and a tensile force is applied to both ends of the connection later at the mold pressing. CONSTITUTION:A fancy rubber 3 and a cotton canvas 2 at both ends are peeled off. Only tension members 9 and 9 are lapped one upon another by a proper length in such a manner that an unvulcanized rubber sheet 8 is so arranged between laps to adhere thereto on one side and then, put together by vulcanization under pressure with a small joint press 10. Then, an unvulcanized rubber sheet 11 is arranged on the portions excluding the lap sections of the members 9 and the unvulcanized rubber sheet 8 and the connection of a hand rail 13 is set on a molding die 5 with the cotton canvas 2 and the fancy rubber 3 butting together. When the connection at both ends is molded solidly, a tensile force is applied to the entire hand rail 13 with a tensile force generators 7 each positioned at both ends of the molding die 5. This can eliminate the zigzag of the members 9 and disturbed pitch between the members 9 due to the fluidity of the unvulcanized rubber sheets 8 and 11 near the lap sections.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method of connecting tension members by wrapping them together.

When obtaining an endless one-piece rail 1 as shown in FIGS. 1 and 2, tension members (tensile members) 4 at both ends are placed in a mold 5 to a predetermined length as shown in FIG. 3. The handrail is connected integrally by wrapping (wrap portion L) and placing handrail constituent materials such as the rubberized canvas 2 and decorative rubber 3 together in the mold 5 and vulcanizing them. (endless)
is being carried out.

However, if a material such as aramid fiber has high tensile rigidity but low compressive rigidity (that is, high flexibility) is used as the tension member 4 of the tension member,
If the tension member 4 and other handrail constituent materials such as the canvas 2 and the decorative rubber layer 3 are laminated and pressure vulcanized at once as described above, the rubber covering the tension member 4 can be cured. Since the tension member 4 is moved in a direction perpendicular to the longitudinal direction due to the flow of When the tension member 4 is moved from side to side, the so-called tension member 4 is caused to meander. As a preventive measure, when molding parts other than the connection part of the tension member, as shown in Fig. 3, apply tension to both ends of the tension member 1 to the extent that it can prevent meandering and pitch disturbance using the tension device 7 and T. Mold body conversion is carried out by this method. In this case, it is not possible to apply sufficient tension to the connection part of the tension member to prevent meandering and cord pitch disturbances, so the tension member may be sewn onto the canvas layer above or below using adhesive-treated thread. ...The ends of the cotton canvas, which is the material that makes up the Ndrail, are sewn together and a tension equal to the tensile rigidity of the canvas is applied, but this is not a complete preventive measure. One person who has a tension member with a meandering and disordered pitch.
When the handrail is attached to an escalator or autoline main unit and operated, the meandering part and pitch irregular part of the tension member tend to become straight (straight line) in the longitudinal direction, so the handrail may meander or appear visually. If the handrail deforms abnormally and comes into contact with the frame of each device or the limit switch installed for safety reasons,
There is a possibility that a situation may occur where the operation becomes impossible.

The purpose of this invention is to eliminate the drawbacks of the prior art described above and to provide a handrail connection method that does not cause meandering or cord pitch disturbances in the tension member after vulcanization. The extent to which tension is applied in a handrail connection method using a material with a lower compressive rigidity than tensile rigidity, such as fiber, steel cord, strong human silk cord, or glass fiber, as a tension member. In order to achieve this, only the lap portion of the tension member is vulcanized and connected using a vulcanizing press, etc., and then tension is applied to both ends of the connection portion at the time of mold pressing with canvas, decorative rubber, etc., which are the constituent materials of the handrail. It is in the connection method of the handrail that is applied. Hereinafter, embodiments of the present invention will be described with reference to the drawings. First, although not shown, the surface of a plurality of cords made of aramid fibers, which have a lower compressive rigidity than tensile rigidity, has good adhesion to rubber. In order to achieve this, handrails are treated with a latex adhesive that is a mixture of Vulkabond (trade name of Imperial Chemical Industries), a phenolic polycondensation treatment liquid, vinylpyresine, and styrene-butadiene rubber (SBR). A tension member 9 is prepared in which a plurality of cords treated with adhesive are integrated in parallel on one side of an unvulcanized rubber sheet 8 as shown in FIG. Next, a cotton canvas belt 2 and a decorative rubber belt 3 as shown in FIG.
The tension members 9 made of the aramid fibers described above are arranged at appropriate positions to form a strip-shaped laminate, and the laminate except for the part to be made endless is shown in FIG. It is set in a molding die 5, and then tension is applied to the tension members 9 at both ends other than the set portion by a tensioning device 7, and then a mold press (swanneck press) 6 is used to press it into a C-shaped cross section. Vulcanize.

In this case, since tension is applied to the tension members 9 during vulcanization, there is no possibility that the members 9 meander due to the flow of rubber during molding. Next, in the middle part, both ends of the laminate formed into a handrail are connected to make it endless. In this case, first, as shown in Fig. 4, the decorative rubber 3 and cotton canvas 2 at both ends are connected. Turn over and wrap only the tension members 9, 9 to an appropriate length, and between the wraps place an unvulcanized rubber sheet 8 that has been bonded and integrated on one side in advance, and then attach it to a small joint press 10 from above and below. Then, they are integrated by pressure vulcanization. In this case, the unique latex adhesive attached to the surface of the aramid fiber that is the tension member 9 is melted by heat and is integrated with the unvulcanized rubber sheet 8 through a chemical reaction, and at the same time, the unvulcanized rubber The sheet 8 is vulcanized and the connection is completed only at the lap portions of the tension members 9. Moreover, during this pressing, it goes without saying that the unvulcanized rubber other than the lap portion of the tension member 9 must be removed in advance so as not to be affected by the press heat. Moreover, the unvulcanized rubber sheet 8 is used to improve the adhesion between the tension member 9 and the cotton canvas 2, and the unvulcanized rubber is placed between the wraps to the tension member. In this case, there is no need to prepare an unvulcanized rubber sheet in advance, and there is an advantage that the unvulcanized rubber sheet 8 can be immediately used for the wrap portion. Next, when the bonding and integration of the lap portion of the tension member 9 is completed, as shown in FIG. An unvulcanized rubber sheet 11 similar to the unvulcanized rubber sheet 8 is placed in the lap part of -9 and the part from which the unvulcanized rubber sheet 8 has been removed,
As shown in FIG. 6, the turned-up cotton canvas 2 and the decorative elastic 3 are butted together, and the cotton canvases 2 are sewn together (seamed portion 12). The part is set in a molding die 5 shown in FIG. In this case, handrail 13
When the intermediate part in the longitudinal direction is vulcanized and the joints at both ends are molded, the entire tension device 7 located at both ends of the one-end rail mold die 5 is used to vulcanize the middle part in the longitudinal direction of the two-end rail 13. Tension is applied to the ends of the tension member 9 in advance using a vulcanized rubber sheet 8.
Since they are connected and integrated through the tension member 9, the tension can be increased up to the tension allowed by the tension member 9. Moreover, even if pressure vulcanization is performed under tension, the rubber between the laps of the tension member 9 is compressed by the small joint press 1.
0 has already finished the vulcanization reaction, there is no fear that the rubber between the laps will flow due to the heat of the mold press 6, and the tension member 9 is not able to maintain the tension allowed by the member 9. Therefore, if the tension members 19 near the lap meander or the pitch between the members 9 becomes disordered due to the flow of the unvulcanized rubber sheets 8, 11 near the lap, All fear will disappear. In addition, in this case, the surface of the aramid fibers has been previously treated with a latex adhesive that is a mixture of VALKABOND, a phenol-based polycondensation treatment liquid, vinylpyresine, and styrene-butadiene rubber, and the latex adhesive is chemically different from the rubber layer. Because they are strongly integrated by a chemical reaction, when the entire handrail is being vulcanized in the mold 5, the tension member 19 remains in contact with the rubber 8 even after the rubber vulcanization temperature history. Another point that cannot be overlooked is that the adhesive strength does not decrease. In addition to aramid fiber, materials such as steel cord, strong human silk cord, and glass fiber, which have a lower compression rigidity than tensile rigidity, can be considered for the circumference and tension member.

Also, in this example, the middle part of the handrail is molded, and then the connection part is connected and molded. However, the connection part of the handrail is connected and molded first, and then the middle part is molded. May be molded.

As described above, according to the present invention, only the lap part of the tension member is vulcanized and connected in advance through unvulcanized rubber at the handrail connection part, and then the entire part of the handrail constituent material is bonded to the handrail connection part through unvulcanized rubber. Because it is pressure-cured under tension, there is no disturbance of the tension member during vulcanization, and there is no longer any itchiness that occurs when the canvas rises in part during molding, unlike conventional methods. Therefore, there is no fear of cracking of the decorative rubber due to the swelling, and its industrial value is therefore great.

[Brief explanation of the drawing]

Figure 1 is a side view of a general endless handrail, Figure 2 is a cross-sectional view taken along line A-A in Figure 1, Figure 3 is an explanatory diagram showing a general mold, Figures 4 and 5. 6 and 6 are explanatory diagrams showing essential parts of the present invention. 1, 13...1.ndrail, 2..cotton canvas, 3.
... Decorative rubber, 4, 9... Tension member 1, 5.
...Handrail mold die, 6...Mold press, 7...Tension device, 8, 11...Unvulcanized rubber sheet, 10...Small joint press, 12...Sewing portion.

Claims (1)

[Claims] 1. In a method of connecting a handrail in which a tension member is made of a material having a lower compressive rigidity than tensile rigidity, such as aramid fiber, steel cord, strong human silk cord, or glass fiber, the tension member is Only the lap portion is vulcanized and connected using a vulcanization press or the like via unvulcanized rubber, and tension is applied to both ends of the connection portion when it is later mold-pressed with canvas, decorative rubber, etc. that are the constituent materials of the handrail. A handrail connection method characterized by: