JPS6131026B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to steps for passenger conveyors such as escalators, and particularly to improvements to the rear roller portion.

In recent years, passenger conveyors have become extremely popular as transportation equipment for urban transportation, where there are many passengers and they are often used violently. For this reason, the strength of conventional steps, which were designed with well-behaved users in mind, cannot withstand the situation.

On the other hand, for passenger conveyors for urban transportation, there is a demand for high-strength steps that can handle the rush of commuters and long hours of driving.

The conventional structure is generally as shown in FIGS. 1 to 4. The main components of this step 1 are a cleat 2 on which a passenger rides, a riser 3 that extends downward from the rear end of the cleat 2 to close the step, and brackets 4 on both sides that serve as a frame. A front roller 5 is disposed at the front lower end of the bracket 4, and a rear roller 6 is disposed at the rear lower end, and the bracket 4 runs endlessly on a guide rail 8 via a connecting chain 7.

This step 1 must be lightweight enough to reduce the driving force, and must have sufficient strength from the standpoint of passenger protection.

However, with the structure of the conventional step 1, especially the bracket 4 which is the main strength member, there remain concerns regarding the strength.

The conventional bracket 4 has a substantially triangular shape as shown in the figure, and has a front shaft 9 connecting the front roller 5 at the front and a long rear shaft 10 supporting the rear roller 6 at the rear.
is located. The rear roller 6 is fixed to the end of the rear shaft 10 passing through the brackets 4 on both sides by a spring ring 10b, and further includes an annular ring 10a.
A distance from the bracket 4 is ensured by this. In addition, in the conventional example, the bracket 4 is located at the central portion
Some have a window or _one rib. and the live load (passengers, etc.) w ₁
are divided as shown by the arrows in FIGS. 3, 5, and 6. That is, since the bracket 4 is positioned narrower than the width of the cleat 2 and positioned behind the lower end of the riser 3, various bending and return moments occur. To summarize this moment, a support reaction force is generated at the roller portions at points A and C on the side surface, and a large reaction force w ₂ is generated particularly at the rear roller 6 portion as shown in FIG. In this case, the rear shaft of bracket 4 has point B as its fulcrum.
A bending moment of w ₂ × m is generated, and further component force
w ₃ and w ₄ are also occurring.

On the other hand, on the front side of step 1, one of the brackets 4 receives the load w ₀ generated by the load w ₁ as shown in Fig. 6, and the reaction force w ₂ and the torsional moment Q multiplied by the overhang are generated.
(w ₂ ×) is generated, and this moment is transferred to the rear roller 6
acts on a point D above (n apart).
In addition, the bracket 4 also receives a compressive load, resulting in an extremely complicated load distribution, requiring a more advanced strength setting than that of general strength members such as bridges.

Here, the structure of the bracket 4 is approximately triangular with reinforcing ribs 4a standing up on its periphery, and the space formed by the reinforcing ribs 4a is provided in the rear roller 6 portion, which is a key point for strength as described above. Usually, a lid-shaped reinforcing body 4b is fixedly joined by welding (section S in FIG. 4) so as to close the lid. As shown in Fig. 3, the positional relationship between the two is such that this bracket ₄ receives a downward load w0, which is part of the load _w1 , and
Furthermore, part of the reaction force w ₂ resisting this w ₀ is transferred to the reinforcement body 4
b itself will be received as an upward w ₅ . Therefore, a clockwise force acts on the bracket 4 itself, and a counterclockwise force acts on the reinforcing body 4b.

In this way, since opposing forces act on the integrated bracket 4 and reinforcing body 4b, the shear force is concentrated at the joint S in FIGS. 2 and 4. Therefore, although the strength of the stress concentrated portion of the bracket 4 is increased by the reinforcement 4b, stress is concentrated near the joint S shown in FIG. 2, which causes cracks and damage. There is a danger of this happening.
Here, the reason for setting the joint S is the bracket 4.
Since there is almost no margin for the rear lower end with respect to the diameter of the rear shaft 10, the outer periphery of the bracket 4 is welded. To deal with this, the reinforcement body 4
Measures have been taken such as making the bracket itself thicker without using b. However, making the bracket 4 thicker goes against the weight reduction in step 1, and therefore, no appropriate improvement can be made.

In view of this point, the present invention has been made in order to improve the strength and economical improvement of the rear lower end portion of the step.

Hereinafter, one embodiment of the present invention will be described based on the drawings.

In FIGS. 7 and 8, the configurations of the cleat 2, riser 3, etc. are the same as the conventional ones, so illustrations can be omitted. A bracket 12 in which a reinforcing plate 13 formed in approximately the same shape is joined to a plate surface surrounded by reinforcing ribs 12a and ribs 12b.
It is characterized by this. The bracket 12 and the reinforcing plate 13 are joined at a plurality of joint points Z. As explained in FIG. 4, the joining point Z cannot be provided at the M and N parts of the rear lower end of the bracket due to lack of space, so the following measures are taken. That is, since the M part and the N part are not joined, the fitting part 15a is fitted into the holes _H1 and _H2 of this part,
Large diameter portion 15b (fitting portion 15a) that becomes a stepped portion
a rear shaft 15 having a larger diameter) and a threaded portion 15c.
is provided. In this case, the rear roller 6 is fixed by a spring ring 10b as in the conventional case, and a washer 16 and a nut 17 are further provided on the threaded portion 15c. Then, the large diameter portion 15b and the nut 1
The tightening force between bracket 12 and reinforcing plate 1
3 are jointly tightened to firmly adhere to each other, thereby obtaining the same adhesion as at the joint point Z. By doing this, the supporting reaction force _w2 mentioned above is dispersed over the entire area of the bracket 12 by the reinforcing plate 13, and the stress concentration at point D shown in FIG. 6 is largely eliminated. .

This eliminates the need for conventional measures to improve the strength of the bracket, such as increasing the plate thickness and increasing the amount of ribs, and also eliminates the need for a long rear shaft, resulting in resource-saving improvements. has advantages.

According to the present invention described above, there is an advantage that a high-strength and inexpensive step can be provided.

Note that the illustrated bracket 12 may be provided with a reinforcing plate 14 shown in FIG. 9. That is,
This has the effect of reinforcing the point D where stress is concentrated, and transmitting the force acting on this portion to the upper part of the bracket 12 to disperse the stress.

[Brief explanation of the drawing]

Figure 1 is a perspective view of a conventional passenger conveyor step.
Figure 2 is a side view of the step in Figure 1, Figure 3 is a sectional view taken along the - line in Figure 2, and Figure 4 is a side view of the step in Figure 2.
5 and 6 are cross-sectional views along the line, and Figures 5 and 6 illustrate the forces acting on the step. Figure 5 is a side view, Figure 6 is a front view along the line - of Figure 5, and Figure 7 is a cross-sectional view along the line. 8 is a perspective view showing one embodiment of the present invention, FIG. 8 is a sectional view taken along the line -- in FIG. 7, and FIG. 9 is a perspective view illustrating another embodiment of the present invention. 1... Steps, 2... Cleats, 3... Riser,
12... Bracket, 13, 14... Reinforcement plate, 1
5... Rear axis.

Claims (1)

[Claims] 1. A cleat that forms the surface of a step that is arranged in an endless manner and rotates, a rideza that extends downward from the rear end of the cleat, and a plate that is located below both ends of the cleat and has reinforcing ribs on its periphery. A bracket having a shape, a rear shaft supported by passing through the rear lower end of the bracket, and a rear roller pivotally supported by the rear shaft. A reinforcing plate for reinforcing at least the rear lower end portion is brought into contact with the bracket at a plurality of locations, and one of these locations is connected to a fastener using a stepped portion provided on the rear shaft that supports the rear roller. A step of a passenger conveyor characterized by being jointly fastened by.