JPS6118691A - Frame for escalator - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Application of the Invention] The present invention relates to an improvement in the structure of a frame used in an escalator.

[Background of the invention]

As shown in FIGS. 1 and 2, a conventional escalator includes an endless tread 1 for transporting passengers, a drive mechanism for running this tread 1, such as a drive machine and a chino (not shown), and It consists of an escalator frame 4 incorporating a drive mechanism, balustrades 2 provided on both sides of the upper part of this frame 4, and handrail frames 8 each mounted on these balustrades 2 and supporting a hunt rail 3, It is well known that the footboard 1 runs between the two railings 2, 2, and carries passengers (not shown) riding on the footboard 1 from the lower floor A to the upper floor B. The handrail 3 is configured to move at the same speed as the tread 1, thus helping the passengers on the tread 1 to safely board and exit the vehicle.

The escalator frame 4 includes a pair of left and right outer frames 5, a plurality of middle crossbeams 6 and a bottom crossbeam 7 whose ends are welded to the left and right side frames 5, respectively, and the both sides. It consists of an interior panel 9 attached to the inside of the upper part of the frame 5, and a side exterior material 10 and a bottom exterior material 11 surrounding the outside and bottom of the frame 5 on both sides. It is preferable to use various materials for these exterior materials 10.11 from a design standpoint, but since it is not possible to completely cover the sides with a conventional truss frame, fire-resistant materials or materials made of fire-resistant materials are preferred. It is required by law to use a device with a different material attached to its surface. For this reason,
The materials that could be used for the exterior were severely limited, and freedom of design was hindered.

3 and 4 show the truss structure of a typical conventional escalator frame, in which the side frame 5
A is an upper main string member 12 and a lower main string member] 3 arranged almost in parallel 1, a vertical column 14 that holds both members 12 and 13 at an appropriate distance is installed at right angles, and a diagonal column 15 is placed at an appropriate distance. It is arranged at an angle and is manufactured by joining the overlapping portions of the members 12, 13, the vertical columns 14, and the oblique columns 15 by fillet welding.

Such truss structures are commonly used in bridges, steel towers, etc., and are lightweight and durable. However, as is clear from Fig. 3, there are a large number of component parts and the components must be welded together, so it takes a long time to manufacture the parts and weld the parts together, and the welding points are difficult to weld. Because of the large number of welds, there was a risk that not only the welding strain would be large, but also the shape accuracy of the manufactured frame would be poor.

Furthermore, since all force transmission between members occurs through welds, high reliability is required for the large number of welds. On the other hand, the strength of welded parts is lower than that of non-welded parts due to residual stress and welding defects caused by welding, so truss structures must be designed with this in mind for the reduction in strength and concentration of force at welded parts. There is a problem.

A typical escalator is a structure whose total dead weight is larger than its loaded weight, and an example of the load breakdown used in the strength design of the frame of this escalator is shown in Table 1 below. The symbols wx and W21 W:1 in this table indicate the weight per unit length of the lower, middle, and upper parts of each type of escalator frame, respectively.

Table 1 (Load type and weight) (Unit: kg/m) As can be seen from the above table, the escalator load is distributed almost equally over the entire length of the frame. FIGS. 5(c) and 5(d) show the shear force F and bending moment M acting on the escalator frame, respectively. As shown in Figure 5(b), since the load applied to the frame is a uniformly distributed load, the maximum bending moment is applied to the center of the frame,
The maximum shear force is applied to both ends of the frame.

Furthermore, as shown in Table 1, most of the load applied to the escalator frame is the weight of the components that make up the escalator, such as the frame body, treads, handrails, and exterior. As shown in Fig. 5(a), assuming that the horizontal longitudinal direction of the frame is the X direction, the vertical direction of the frame is the X direction, and the cross-sectional direction (not shown) of the frame is the Z direction, the distributed load applied to the escalator frame is is distributed almost uniformly in the x-y plane. Therefore, if the escalator's own weight is balanced against the center of the frame cross section (y-z plane), no force will be applied to the frame to twist it. The frame has a support span L
is extremely long at 10 to 14 m, while its cross-sectional dimensions are I x 1. Since it is a long and slender structure of about m
Figures (b) to (d) show distributions of load W, shear force F, and bending moment M.

Moreover, the shear force F and bending moment)-M are
Balanced about the center of the cross section (y-z plane), approximately the same force is applied in the plane of the side frames on both sides. Furthermore, since the escalator frame has a long support span L, it must have a structure that can withstand extremely large bending moments.

6 and 7 show cross sections of an escalator frame proposed to improve the problems of the conventional frame structure shown in FIG. 4. In these proposed frames, integral E-beam steel and formed channel steel plates are used for the side frames 5 and 5'.
The conventional vertical column 14 and oblique column 15 shown in FIG. 4 are no longer necessary, and both columns 14, 15 and both main chord members 12.1-3
Since there is no need for joining with other parts, manufacturing becomes easier.

As explained in Fig. 5, the escalator frame receives a large bending moment on the side frames.
Although strength is required to withstand this bending moment, these frame structures are not the best structures for the internal bending loads of the side frames. The strength of the frame against bending load in the x-y plane is determined by the cross-sectional rigidity around the Z-axis, so in order to increase this cross-sectional rigidity,
The member may be installed as far away as possible from the center of the cross section around the axis.

However, in the frame structures shown in Figures 6 and 7, it is not possible to reduce the thickness of the intermediate side plate that connects the flanges at both ends, which correspond to the main string members, compared to the conventional truss structure. The weight of the frame is large.

FIGS. 8 and 9 show a conventional escalator side frame 5B that has improved the problems of the escalator side frame 5A shown in the known example (FIGS. 3 and 4), that is, the large number of parts and welded parts. Shown below.

In the side frame 5A, the vertical column ]-4 and the diagonal column '5
However, by using the triangular member 16 in this side frame 5B, it is possible to reduce the number of members and the number of welding locations 16A. Furthermore, since the triangular members 16 have the same shape, they can be processed by press forming, thereby reducing processing costs, improving dimensional accuracy, and shortening manufacturing time.

However, in this side frame 5B, the main string member 12.
13 and the triangular member 16, that is, the overlapping portion between the apex portion of the triangular member 16 and the main string member 12°13,
Joined together by spot or fillet welds.

Therefore, in this frame 5B, as with the frame 5A, force is concentrated at the joint, and since there is a weld at that part, the joint is the weakest part. In addition, the dimensions of the frame are determined by the strength of the joints, so
In areas other than the joints, materials are wasted and it becomes difficult to reduce the weight of the frame.

FIG. 10 shows another improved example of the conventional escalator frame, and this frame 4A is formed by molding a single flat plate into a U-shape. This frame 4A has a parapet 2. Support metal fittings], 7 that support the handrail 3 and the interior panel 9, and a middle crossbeam 6 that supports the running rail of the footboard 1 are attached. It is also possible to utilize an escalator frame formed from a single flat plate into a U-shape with flat side and bottom surfaces as an exterior plate of an escalator. However, since the escalator frame is a large structure and has a long overall length, it is difficult to bend and form the escalator frame from a single flat plate.
There are some problems with processing.

Furthermore, FIG. 11 shows another known example of the side frame of the conventional escalator frame.
By providing Da and 5Db, the cross-sectional shape of the side frame 5C is made into a channel steel.

It is formed into lip channel steel. The web portion of the channel steel may be provided with punched holes or protrusions 18, or may have a suitable reinforcing member (not shown) welded to the web. These publicly known side frames were proposed as an improvement to the truss structure shown in Fig. 3 used in general escalator frames, and the number of members constituting the truss, welding locations, and welding deformation were significantly reduced. The purpose is to reduce

However, an escalator frame in which the side frame is formed from a single plate has disadvantages in view of the load conditions of the escalator. That is, since the escalator exhibits a load distribution as shown in FIG. 5 and is a long and slender structure with a long support span, the strength of the escalator frame must be able to withstand a large bending moment at the center of the span. Most of the bending moments acting on the escalator frame are borne by the side frames. Therefore, the side frame must have in-plane rigidity to withstand bending stress within its cross section. The rigidity in the cross section is maximized when the cross-sectional area is concentrated at both ends of the side frame and the cross-sectional area of the web portion is kept to the necessary minimum. If the side frame is formed from a single plate as in the known example shown in FIG. 11, it is difficult to realize the above conditions. Furthermore, welding a reinforcing material to the web portion is disadvantageous in constructing a lightweight and highly rigid frame.

[Purpose of the invention]

In view of the above, the present invention aims to manufacture a lightweight escalator frame in a short period of time and improve productivity by standardizing the members constituting the escalator frame and optimizing the arrangement of the members. be.

[Summary of the invention]

In order to achieve the above objects, the present invention provides a connected tread for transporting passengers, a running rail and drive mechanism for these treads, a pair of handrails for supporting a handrail and a pan frame. In the escalator, the escalator is provided with a pair of side frames that respectively support these handrails, and the side frames are arranged on a pair of side frames that are arranged substantially parallel to each other with a predetermined interval.

It is characterized by comprising a lower main string member, a plurality of vertical members provided between both main string members, and a flat plate rigidly connected to the both live string members and the longitudinal member.

[Embodiments of the invention]

Embodiments of the present invention will be described below with reference to the drawings.

12 to 14 show essential parts of an embodiment of an escalator frame according to the present invention. The left and right side frames 5D of this frame 4B include a pair of upper main string members ]-2 and lower main string member 13, which are arranged substantially parallel to each other with a predetermined interval, and these double string members 12.1.
The main chord members 12, 13 and the longitudinal members 19 are rigidly connected to each other by a flat plate 20. The vertical member 19 is shown in FIG.
), one end is fixed to the upper main string member 12, the other end to the lower main string member 13, and the middle part is fixed to the flat plate 20.

As shown in FIG. 14, the side frame 5D has a ladder shape, which is made up of the upper and lower main chord members 12°] 3 on the flat plate 20 and a plurality of vertical members 19 with a protruding cross section ("L") as described above. It is constructed by combining two frame structures. This side frame 5D has almost the same structure as a general shoji, and the flat plate 20 corresponds to the shoji paper 2 double-sided chord members 12, 13 and the vertical member 19, respectively. The ladder-like frame structure is the same as the conventional truss structure shown in FIG. 3 without the diagonal columns 15, and is a structure that is very weak against in-plane bending loads.

However, when the flat plate 2o is connected to the ladder-like frame structure,
If this flat plate 20 were to share the in-plane load, it would be the same as pasting shoji paper on a shoji screen, so the structure would change to be extremely strong against in-plane bending loads. Moreover, the structure of the side frame 5D is different from the joint part in a normal truss structure because force is sequentially transmitted from both main chord members 12, 13 to the vertical member 19 via the flat plate 20. Force is not concentrated at the joint between the main string members 12° 13 and the vertical member 19.

In this embodiment described above, the upper main string member 12 is subjected to a compressive load, the lower main chord member 13 is a tensile load, the vertical member 19 is a distributed load and a load associated with an in-plane shear force, and the flat plate 20 is applied to an in-plane bending moment. As for the shape of each member, the most appropriate shape for the load to be shared can be used, such as the in-plane shear force. Therefore, according to this embodiment, it is possible to optimize the frame structural members and eliminate the portion where the strength is reduced, so that the weight of the frame can be reduced. On the other hand, both the main chord members 12, 13 and the flat plate 20, and the vertical member 19 and the flat plate 2
Since the load transfer at the joint between the two ends is sequential, the joint may be less strong and reliable than the joint of the l-las structure. Therefore, as the connecting means, spot welding with good workability, adhesive bonding that does not cause any welding distortion, etc. can be used.

FIGS. 15 and 16 show second and third embodiments of the side frame. The former uses chevron rust for the upper and lower main string members 12A, ], 3A, and uses a vertical member 19A with a step L9Aa at both ends (or one end), and these members 12A, 13A, 1
9A is integrally connected to the flat plate 20 to constitute the side frame 5E. With this configuration, the vertical member 1
9A and both upper chord members 1.2A, 13A and the flat plate 2o, and a large number of vertical members 19A.
By standardizing and mass producing, it is possible to reduce production costs and production time.

The latter (third embodiment) is the upper and lower main string members 12B.

A vertical member 19 in which a square steel pipe is used for 13B and a widening portion 19Ba is provided at both ends (or one end).
B, these members 12B.

13B and 19B are integrally joined to a flat plate 20 to constitute a side frame 5F. Since the vertical member 19B can be formed easily and accurately by press working, it is not only possible to manufacture the vertical member 19B with good processing efficiency and at low cost, but also to connect the square steel pipes 12A, ], 3B and the vertical member 19B at right angles. It is.

As mentioned above, each embodiment includes a large number of standardized vertical members, upper and lower main chord members with lengths set according to the height of the floor, and a flat plate integrally connected to these members. Each of the above members has a shape that is easy to manufacture. Furthermore, by respectively connecting the flat plate to the upper and lower main chord parts and the flat plate to the vertical member, a structure strong against both internal bending loads can be constructed.

When a compressive load is applied to the upper main string members 12.12A, 12B, if the load exceeds the buckling load, the upper main string members will break due to buckling deformation.

The limit buckling load Po at which the column causes buckling failure is as follows ('',
) is expressed by the formula (References, Light structure theory and its applications; written by Lin Kuo; published by the Japan Society of Science and Technology).

m2π2EI P8. ＝□　　　　　　　・・・(1) Ω However, E: longitudinal elastic modulus, ■=Second moment of area, Q: Length of pillar, m: Constant determined by load conditions.

From equation (1) above, if E, Q, and m are the same, buckling load P2. It can be seen that is proportional to I to the second moment of area l. Table 2 below shows the cross-sectional shape, cross-sectional moment of inertia, and specific stiffness I/W of commonly used structural members.The values in Table 2 are taken from the 7IS standard. . As can be seen from Table 2, the specific rigidity is highest for square steel pipes, and decreases in the order of steel pipes, angle irons, and channel steels.

In conventional truss-shaped frames, the specific rigidity of the angle iron generally used is about 1/4 that of the square steel pipe.

Table 2 (Specific stiffness of various cross sections) In conventional escalator frames, it was difficult to use thin structural members such as square steel pipes because the force was concentrated at the joints, but in the frame of this example, There is no risk of force being concentrated at the joint, so it is lightweight like a square steel pipe,
In addition, a thin structural member with high specific rigidity can be used.

Also, square steel pipes.

Steel pipes and similar closed-section structural materials have about six times the strength against local wall buckling compared to cross-section structural materials such as angle steel, channel steel, lip channel steel, etc. It is a structural member that is resistant to column buckling.

Because the upper main string member does not have to be attached to the parapet, handrail frame, interior panels, exterior panels, etc., workability is improved.
In view of the strength of the joint and the accuracy of attachment, the cross section of the upper main string member is preferably rectangular or has a closed cross section with a flat section. On the other hand, since the lower main string member receives tensile load, there is a risk of it breaking due to tensile rupture, so it does not need to be made of a material with a particularly large moment of inertia, and is easy to manufacture and inexpensive. It can also be made of steel. By selecting the main string member according to the type of load applied to the escalator frame in this manner, it is possible to reduce the weight of the frame and the manufacturing cost.

FIGS. 17(a) to 17(d) are sectional views of main parts of the side frames of each embodiment, particularly the cross-sectional shapes applied to the upper main string members, all of which are formed into a square or box shape after being joined. The same figure (,) shows the end 20a of the flat plate 20 bent into a square shape.
It is attached to the flat plate 20 at 0a. With this structure, the number of joints can be reduced and the rate of force transmission through the joints can be reduced, so even if the strength of the joints is weak, it is acceptable. In (b), the ends of the flat plate 20 are bent and formed into a box-shaped cross section using channel steel 21 and angle steel 22. With this structure, compared to (a) above, the cross-sectional area and moment of inertia of the main string member can be changed freely according to the required strength of the frame, so
Since the frame can be designed with appropriate strength over its entire length, it is possible to reduce the weight of the frame and save on materials. Ca> connects the ends 23a and 23b of the strip plate 23 to the flat plate 2.
0 to form a box-shaped cross section. (d) shows the bent portion 20c at the end of the flat plate 2o and the band plate 2 formed in a Z shape.
4 is joined to one end of the strip plate 24, and the other end of the strip plate 24 is joined to the flat plate 20 to form a box-shaped cross section.

FIG. 18 shows a fourth embodiment of the side frame, and the side frame 5G of this embodiment includes upper and lower main string members 12, 1.
3. It consists of a vertical member 19 and a pressed flat plate 2OA, and on the outer surface of this flat plate 20A, a plurality of convex bent portions 20Aa are provided in parallel in the longitudinal direction of the side frame.

With this configuration, the rigidity of the flat plate 2OA in the out-of-plane direction increases, but when in-plane bending stress and shear force are applied to the flat plate 20A, the out-of-plane stiffness increases due to the small initial deflection of the flat plate 20A and the eccentricity of the load. Generates deformation. When this out-of-plane deformation occurs, the frame comes into contact with the exterior plate and internal movable parts, deforming the exterior plate and causing the movable parts and frame to gnaw. Therefore, the allowable out-of-plane deformation is determined, and The value is approximately 2 mm.

On the other hand, when in-plane bending stress and shear force are applied to a flat plate whose entire circumference is restrained by frame members, the maximum out-of-plane deformation occurs at the center of the flat plate. However.

When a bent portion is provided on a flat plate, out-of-plane deformation is restrained in the same way as the framework, so out-of-plane deformation occurs in the flat plate surrounded by the bent portion and the framework. Therefore, when a bent portion is provided on a flat plate, the amount of out-of-plane deformation that occurs in the flat plate becomes extremely small.

When a bending force acts in a plane perpendicular to the frame and parallel to the longitudinal direction of the frame (x-y plane in FIG. 5) like an escalator frame, the bent portion 20 A a
When provided parallel to the longitudinal direction of the frame, out-of-plane deformation can be reduced, so the thickness of the flat plate 20A can be reduced. In addition, since the bent part 20Aa was created by bending a part of the flat plate 20A, by providing the bent part 20Aa, it is possible to improve the strength and reduce the weight of the frame without increasing the number of parts. can be measured.

Fig. 19 shows a second embodiment of the frame of the present invention, in which the rising portion 25a of the bottom plate 25 is joined to the lower end of the flat plate 20 in the first embodiment (Fig. 3). As a result, the frame 4c has a U-shaped cross section, which is the same as that of FIG. 10 (prior art example). With this configuration, the bottom plate 25 can be used as an oil pan, and the frame can be covered by the refractory material of the flat plate 20 and the bottom plate 25. Further, since the outer surfaces of the flat plate 20 and the bottom #i25 can be made substantially flat, they can be used as exterior plates.

For escalators where design is important, the flat plate 20 and the bottom plate 25
By using it as the base of the exterior material, it is possible to freely exterior it with various materials. In the conventional truss structure (see Fig. 4), a flat plate part must be provided for the exterior, but according to the second embodiment, the flat plate 2o serves as the base.
The exterior can be made by painting the flat plate 20 or pasting cloth, vinyl, etc. on it. Therefore, the frame itself can be used as a refractory enclosing material and can also be used as a part of the exterior plate, so that the weight and cost of the escalator can be reduced, and the exterior material can be freely selected.

FIG. 20 shows a third embodiment of the frame according to the present invention. The side frame 5 of this embodiment has upper and lower main chord members 12 and 13 on the inner surface of a flat plate 20 and on the outer surface. Attach the vertical member 19 and connect both main string members 12. The structure is such that force is transmitted between j-3 and the vertical member 19 via a flat plate 20. In this way, the vertical member 19
The processing is easier than that shown in FIGS. 1-6 and 17 of the first embodiment, and the frame strength after fabrication is almost the same as that of the first embodiment.

FIG. 21 shows a fourth embodiment of the frame according to the present invention. This embodiment has almost the same structure as the conventional example shown in FIG. 12
．． 13 and the flat plate 20, the return portion 3 of the hunt rail 3
This differs from the conventional example (FIG. 2) in which the return portion 3A of the handrail 3 is housed inside the flat plate 20 of the side frame 5J in that a concave portion 26 for housing the handrail A is formed. This is different from the case where it is stored inside the side. A drive mechanism (not shown) for the treadle 1 is provided inside the side frame, and lubricating oil is supplied to this drive mechanism, so that the return portion 3A is lubricated inside the side frame. There is a risk of oil adhesion.

However, as shown in FIG. 21, the side frame 5J
The upper and lower main string members 12 and 13 are attached to the outside of the flat plate 20 of the side frame, and a recess 26 is provided outside the flat plate 20 of the side frame as described above, and the handrail 3 is installed in the recess 26.
By storing the return portion 3A of the handrail 3,
3A can be prevented from being contaminated by lubricating oil.

As explained in FIG. 5, the escalator frame is a structure that is subjected to large bending moments. For this reason, the upper main chord members 12 of the side frames constituting the escalator frame are subjected to a large compressive load at the center of the span. On the other hand, the shear load applied to the side frames at the center of the span is extremely small. Furthermore, the bending moment becomes zero at both ends of the frame where the shear load is maximum.

FIG. 22 shows a fifth embodiment of the side frame.
In this side frame 5, one end of the flat plate 30 is bent to form an upper main chord part 31 having a rectangular cross section.
A lower main chord part 32 is formed by joining an angle iron to the other end, and a plurality of protrusions 33 are arranged in parallel between the two chord parts 31 and 32 of the flat plate 30. This protrusion 33 is a flat plate 30
By providing the vertical members 19° 19A, 1
It is possible to abolish part or all of 9B.

FIGS. 23(a) and 23(b) show a sixth embodiment of the side frame, and the side frame 5L of this embodiment has a flat plate 4.
Upper and lower main string parts 42 and 43 are respectively attached to the upper and lower ends of 1, and a plurality of protrusions 44 that are orthogonal to the main string parts 42 and 43 are arranged in parallel at wide intervals on the flat plate 41, and It has a structure in which an X-shaped protrusion 45 is provided between protrusions 44. The projections 44, 45 are vertical columns 14. of the truss structure shown in FIG. Each corresponds to the diagonal columns 15, and the flat plate 41 shares the shear load and compression load. Therefore, according to this embodiment, the structure can be simplified by eliminating the conventional vertical columns and diagonal columns.

Both ends 44a and 45a of the ball and projections 44 and 45 are long enough to sufficiently overlap with the upper and lower main string parts 42 and 43, respectively, so that the projections 44 and 45 and the upper and lower main string parts 42 ', 43, the force is reliably transmitted.

FIGS. 24(a) and 24(b) show a seventh embodiment, in which a side frame 5M has a protrusion extending over a part or the entire surface of the flat plate 46 so as to be substantially orthogonal to the longitudinal direction thereof. A plurality of 46a are provided. With this configuration, the vertical member 19 shown in FIG. 14 can be eliminated, and the connection to the flat plate 2° becomes unnecessary. The projections 46a can be formed by press working at appropriate pitches in the longitudinal direction of the flat plate 46, and after cutting the flat plate 46 according to the length of the escalator frame, the upper and lower main string members 12, 13 are formed.
By joining them together, the side frame 5M can be manufactured.

In addition, an X is placed on the flat part of the flat plate 46 between the adjacent projections 46a
By providing M- or H-shaped protrusions (not shown), it is possible to improve the out-of-plane rigidity of the flat plate 46 in the portion surrounded by the amphib chord member 12.13 and the protrusion 46a.

FIG. 25 shows an eighth embodiment of the side frame.
The side frame 5N of this embodiment is a flat plate 4 having a plurality of protrusions 46a arranged in parallel on the outer surface in the width direction (vertical direction).
6 and on this flat plate 46.

Main string member 12 joined to the lower part. i, 3, and a running rail 47 for a tread plate attached longitudinally between the two chord members 12 and 13 via a metal fitting 48, and the metal fitting 48 is spot welded to a protrusion 46a of the flat plate 46. In this way, by attaching the tread running rail 47 to the protrusion 46a via the metal fitting 48 and making a part of the protrusion 46a a closed cross section, the buckling strength of the protrusion 46a in the axial direction is improved. be able to. Furthermore, the flat plate 46 transmits the loads of passengers, treads (not shown), and others applied to the frame to the upper and lower main string members 12, 13 via the running rail 47 instead of the longitudinal member.

〔Effect of the invention〕

As explained above, according to the present invention, an escalator frame is constructed by arranging side frames in which a pair of main string members and a vertical member arranged in parallel between these two members are attached on a flat plate, and Since the shear force can be transmitted within the plane of the truss structure, the inclined trust member required in conventional truss structures can be eliminated, and the number of parts and joints can be significantly reduced, resulting in weight reduction.

Furthermore, since the flat plate can be used as a reference surface for mounting the main string member and the vertical member, it is possible to facilitate the mounting work, improve mounting accuracy, and significantly improve finished dimensional accuracy.

[Brief explanation of drawings]

FIG. 1 is a schematic vertical sectional view of a known escalator, FIG. 2 is a sectional view taken along line A-A in FIG. 1, FIG. 3 is a diagram showing the truss structure of a known escalator frame, and FIG. B-B
The cross-sectional views and FIGS. 5(a) to (cl) show the load and shear force of the escalator frame. Bending moment distribution diagrams, Figures 6 and 7 are longitudinal sectional views of known escalators, Figure 8 is a diagram showing the truss structure of a conventional improved escalator frame, and Figure 9 is C in Figure 8. -C sectional view, FIG. 10 is a longitudinal sectional view of a known improved escalator, FIG. 11 is a perspective view of a side frame of a known escalator frame, and FIGS. 12 to 15 are views of an escalator frame according to the present invention. 12 shows the truss structure of the side frame, FIG. 13 is a sectional view taken along line DD in FIG. 12, and FIG. 14 (a
) (b) is a sectional view of the side frame and E in the same figure (a).
-E sectional view, FIGS. 15 and 16 are perspective views showing the second and third embodiments of the side frame, and FIG. 17 (
a) to (d) are sectional views of main parts of the side frame of each example,
FIG. 18 is a sectional view showing a fourth embodiment of the side frame, FIGS. 19 to 21 are sectional views showing each embodiment of the escalator frame according to the present invention, and FIG. 22 is a sectional view showing the fifth embodiment of the side frame. 23(a) and 24(a) are sectional views showing the sixth and seventh embodiments of the side frame, and FIG. 23(b) and FIG. 24(a) are perspective views showing the embodiment. b
) are the P-F cross-sectional view in Figure 23(a) and the second
FIG. 4(a) is a sectional view taken along line G-C, and FIG. 25 is a perspective view showing an eighth embodiment of the side frame. 1... Stepboard, 2... Balustrade, 3... Handrail,
3A...Handrail return part, 4B, 4C...Escalator frame, 5D-5N...Side frame, 1
2゜12A, 12B... Upper main string member, 13, 13A
.

Claims (1)

[Scope of Claims] 1. A connecting footboard for transporting passengers, a running rail and drive mechanism for these footboards, a pair of handrails that support a handrail and a hand frame, and a pair of handrails that support each of these handrails. In an escalator equipped with a pair of side frames, the side frame includes a pair of upper and lower main string members arranged substantially parallel to each other with a predetermined interval, and an escalator provided between the two main string members. An escalator frame comprising a plurality of vertical members and a flat plate rigidly connected to both the main string members and the vertical members. 2. The escalator frame according to claim 1, characterized in that a stepped portion is provided at one end or both ends of the surface of the vertical member that joins with the flat plate. 3. The escalator frame according to claim 1, wherein one or both ends of the vertical member are formed to widen toward the end. 4. The escalator frame according to claim 1 or 3, wherein at least the upper main string member of both the main string members is formed so that its cross section is approximately rectangular. 5. The escalator frame according to claim 1 or 4, wherein a plurality of parallel convex bent portions are provided on the outer surface of the flat plate in the longitudinal direction of the side frame. . 6. The escalator frame according to claim 1, characterized in that a bottom plate is rigidly connected to the lower end of the flat plate. 7. The escalator frame according to claim 1, wherein a vertical member is attached to one side surface of the flat plate, and main string members are attached to the upper and lower parts of the other side surface, respectively. 8. The vertical portion is attached to the inner surface of the flat plate, and the upper and lower main string members are attached to the outer surface of the flat plate, and the flat plate and both main string members form a recess for storing the return portion of the handrail. An escalator frame according to claim 1. 9. Attach the upper and lower main string parts to the upper and lower ends of the flat plate, respectively, and arrange a plurality of protrusions perpendicular to the main string part on the flat plate at wide intervals, and between these adjacent protrusions. X
2. The escalator frame according to claim 1, further comprising a letter-shaped protrusion. 10. The escalator frame according to claim 1, wherein a plurality of protrusions are provided on a part or the entire surface of the flat plate so as to be substantially orthogonal to the longitudinal direction of the flat plate. 11. Claim 1, characterized in that a plurality of protrusions are arranged in parallel on the outer surface of the flat plate in the width direction, and a tread running rail is attached to these protrusions in the longitudinal direction of the flat plate. Frame of escalator as described in section.