JP2003226481A - Treadboard instruction sign belt of passenger conveyor - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a treadboard instruction sign belt for improving the workability by preventing generation of stress cracking caused by screw tightening and generation of cracking caused by adhesion of oil, acid, alkali, a solvent, etc., and preventing deterioration of the attractiveness of the design of a passenger conveyor. <P>SOLUTION: The instruction sign belt 10, mounted at an end of a treadboard, constitutes a part of a plurality of treadboards 7 of the passenger conveyor for designating the border between steps, and has a screw tightening part to be connected with the base of the treadboard. A collar 12 with a prescribed strength is inserted into the screw tightening part, and the stress generated by the screw tightening is received by the collar 12. <P>COPYRIGHT: (C)2003,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a footstep caution sign strip of a passenger conveyor.

[0002]

2. Description of the Related Art FIG. 7 is a perspective view showing a mounting state of a step of an escalator, and FIG. 8 shows a resin warning sign belt mounting structure at a front end portion of a tread plate (similarly to the end portion on the tread plate side). FIG. 6 is a partial cross-sectional view (perspective view) taken along the line I.

In the figure, 1 is a step made of aluminum die casting or the like, 2 is a step shaft extending in the width direction of step 1, and the front end of step 1 is connected, and 3 is a step shaft 2 on both sides of step 1. Linked to step 1
It is a pair of left and right step chains that transmit the driving force to. 4 is a pair of step rollers attached to both ends of the step shaft 2, 5 is a pair of follower rollers attached to the rear end of the step 1, and the load of step 1 is the step roller 4 and the follower roller 5. It is supported by. A skirt guard 6 is provided at the lower part of the balustrade of the escalator and faces both ends of the step 1 in the width direction with a slight gap.

In each step, 7 is a tread on which a passenger rides,
Reference numeral 8 denotes an arc-shaped riser having cleats that are offset by half a pitch with respect to the cleats of the tread plate 7, and 9 is a triangular bracket provided at both ends in the width direction of the step 1. 8 is attached. Reference numeral 10 is a caution sign band, which is screwed to the front end base portion 7a of the tread plate 7 with a screw 11 so as to be flush with the upper surface of the cleat (uneven portion) of the tread plate 7.
It is a molded product usually made of yellow resin that meshes with the cleat of the riser 8 and clearly shows the division between adjacent treads at the entrance / exit. This caution sign strip 10 is divided into a plurality in the step width direction for the convenience of maintenance, and each caution sign strip is screwed with at least about three screws.

FIG. 9 is a partial front view taken along the line II-II of FIG. 8, in which the caution sign band shows the shape before attachment. As shown in the figure, the caution sign belt 10 has the same cleat shape as the tread on the upper surface, and for the reason of its shape, the upper surface side is more likely to contract than the lower surface side during molding cooling, and the warp shape is such that both ends float up. Therefore, both ends are screwed so as to be pressed against the tread base 7a.

[0006]

As described above, conventionally, since both ends of the caution sign strip having a warped shape in which both ends are lifted, the both ends of the caution sign band are screwed so as to be pressed against the base of the tread plate, the internal stress is not applied to the resin itself. Occurs, stress cracks and oil, acid,
In addition to the problem that cracks are likely to occur due to alkalis, solvents, etc., if one caution sign strip breaks in two for some reason, it will float up and collide with other parts of the escalator, causing it to fall off. there were. Therefore, for example, passengers could get caught in the part where the caution sign stripped off, and if the escalator was driven as it was, the step could get caught when the step was placed under the floor near the upper and lower alighting points, which is very dangerous. was there.

In order to solve this, reverse direction (convex upward)
However, it is not technically easy to realize a uniform warped state or a straight line shape by controlling the warp direction in consideration of this area when designing the shape of the molding die. The method of forcing a jig into a forcible jig immediately after demolding also causes severe deformation if the forcing is too tight, and there is a problem in workability when assembling the caution sign strip (screw tightening) (for example, automatic screw tightening machine). There is a problem that it will not be able to be tightened with a screw) or that even if you force it once, it will eventually warp in the original warp direction after a long time has passed, so realize a proper warp and maintain that state permanently. Was difficult.

Although a method of directly painting a caution color such as yellow on a step plate made of aluminum die-casting as a warning sign belt has been used, the paint is peeled off by being rubbed by passengers or luggage after many years of use, resulting in a design. There was a problem that it deteriorated.

For the above reasons, the warning sign strip is usually made of resin. However, since it is made of resin, as described above, stress cracks in the screw tightening portion, oil, acid, There is a problem that cracks are likely to occur due to alkalis, solvents and the like.

However, most of the problems are limited to the screw tightening portion (the portion where the stress is concentrated), and as a solution to this problem, it is conceivable to avoid this problem by, for example, a snap type attachment / detachment method. For safety, it must not be easily removed during use, and if it is necessary to remove it for replacement or maintenance, it has been difficult to put it into practical use.

Further, when the insert part is inserted into the tightening portion to reinforce the insert part, the color of the insert is usually different from the color of the caution sign strip, so that the design of the passenger conveyor is deteriorated.

Further, in the passenger conveyor, there is a problem that it is difficult to completely prevent oil or a strong alkaline detergent from adhering to parts such as treads due to the environment of installation and the composition of parts.

The present invention avoids the occurrence of stress cracks due to screw tightening, avoids the occurrence of cracks due to the adhesion of oil, acid, alkali, solvent, etc., and further prevents deterioration of the design of the man conveyor and improves workability. The purpose is to provide a tread caution sign strip.

[0014]

Means for Solving the Problems The tread caution sign strip of a man conveyor according to the present invention constitutes a part of a plurality of treads provided at the end of the man conveyor, and clearly indicates a boundary between mutual steps, The structure is provided with a screw tightening portion for coupling with the base of the tread plate, a collar having a predetermined strength is inserted into the screw tightening portion, and the collar receives a stress generated by the screw tightening.

Further, the footboard caution sign strip of the passenger conveyor according to the present invention is provided with a flange around the collar top.

The tread caution sign strip of the passenger conveyor according to the present invention constitutes a part of a plurality of treads provided at the end of the passenger conveyor, and clearly shows the boundary between the steps, and the base of the tread. Equipped with a screw tightening part to connect with, the stress of screw tightening is used for the member of the tread using a stepped screw, and the distance in the height direction between the head of the screw and the caution sign band recess is It has a structure in which 0 is set to a just touch, or a specific value is set to have a gap.

The footboard caution sign strip of the passenger conveyor according to the present invention is provided with at least one uneven portion on the back surface.

Further, the footboard caution sign strip of the passenger conveyor according to the present invention is such that a washer made of a material having a predetermined softness is inserted as a seat of the screw into a gap formed under the screw head. is there.

[0019]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiment 1. FIG. 7 is also used in the first embodiment. FIG. 1 is a cross-sectional view showing a state where a resin marker strip is attached to a tread plate. Reference numeral 12 is a metal collar fixed to the resin part in advance by insert (molding insert) or after resin molding and post-processing press-fitting (heat press-fitting or ultrasonic press-fitting) or an adhesive, and the total height of the screw tightening part of the resin part. Has been inserted over. In the case of press-fitting after working, a metal collar having a knurled outer periphery may be used. Reference numeral 11 denotes a tightening screw, which is usually a tapping screw or the like because of workability problems. Alternatively, the mounting hole on the fixing material side may not be provided with a screw groove and may be fixed with a nut. The collar 12 has no thread groove on the inner surface and is tightened while cutting the screw with the screw 11.
As described above, if the positional deviation after attachment is prevented by providing the positioning projections on the back surface of the caution sign strip at the time of attaching the sign, it is possible to cut the screw on the inner surface of the collar and eliminate the screw tightening. (The inner diameter of the collar 12 is set to be larger than the screw diameter.) When the screw is to be nut-fixed, it is avoided that both the collar portion A and the tread portion B of the screw 11 are tightened by the screw, and at least one of them is tightened. It needs to be a hole without taps.

With the structure described above, the axial force acting from the screw head (flange portion) at the time of tightening the screw can be taken up by the collar 12 and the boundary portion between the collar 12 and the tread plate 7, so that the resin portion of the caution sign strip 10 can be handled. High stress can be avoided.

When the collar 12 is fixed by adhesion, high stress does not occur in the resin portion, and even when the collar is press-fitted, internal stress only occurs. It is sufficient if pressure is applied to the collar 12 so that it does not come off.
Further, since pressure is applied to the entire outer surface of the collar 12, this internal stress can be kept low.

FIG. 2 is a cross-sectional view showing a state in which a resin marking strip is attached to a tread plate with a flanged collar through screws, and the collar 12 is provided for facilitating work when the collar is inserted after molding. A flange portion is provided on the to facilitate press fitting.

Even in this case, the stress generated by tightening the screws can avoid the concentration of stress by making the area of the flange portion of the collar 12 as large as possible (the limit is the diameter not larger than the gap between the mutual cleats of the treads). Further, if the length of the C portion of the collar 12 is equal to or slightly longer than the resin thickness, the stress generated in the flange portion, which is related to the stress of the resin portion, can be surely reduced.

This makes it possible to avoid the problem that stress cracks and cracks due to oil, acid, alkali, solvent, etc., tend to occur.

At this time, the design of the passenger conveyor is prevented from being deteriorated by matching the color of the color with the color of the caution sign strip. The collar is made of, for example, a metal having sufficient mechanical strength against the stress generated when tightening the screws. When a resin is used, it is usually easy to color the material itself, and even in the case of metal, it is sufficient to paint and paint the visible portion from the passenger position of the color man conveyer.

Embodiment 2. 3 is a cross-sectional view showing a second embodiment of the present invention, and is a cross-sectional view showing a state where a resin marker band is attached to a tread plate with stepped screws. In the figure,
The screw 11 is a stepped screw, and the D portion is configured to have the same thickness as the resin or slightly longer than that (the figure shows the case of the same length). do not have. The E portion has a screw thread on the tread plate mounting portion and can be tightened while cutting a thread groove on the tread plate. When the portion D is slightly longer than the thickness of the resin, the resin portion floats up, and therefore there is a limit in lengthening it as well, and it is about 0.1 to 0.2 mm longer (see the gap 13 in FIG. 4). At this time, all axial forces received from the screw head at the time of tightening can be taken up by the boundary portion between the D portion and the E portion, and the stress generated in the resin portion of the caution sign strip 10 can be reduced.

FIG. 4 is a view showing a case where the above stepped screw is used to fix the nut with a nut. If you attach the resin caution sign belt to the tread with the caution sign once attached, the hole on the tread side will have already been tapped, so it will be difficult to tighten the screw again. In some cases, it is effective to use the screw holes on the treads as stupid holes and nut the warning sign strips. When fixing with nuts, there is no tap in the hole in the tread. FIG. 4 shows a case where the screw D portion in FIG. 3 is configured to be slightly longer than the thickness of the resin, 14 is a nut, 15 is a spring washer, and 16 is a washer.

As described above, according to the second embodiment, the axial force at the time of screw tightening is applied to the tread plate (usually made of aluminum die cast) at the screw stepped portion, and the height to the resin warning sign belt is increased. Since stress generation is avoided, it is possible to avoid the occurrence of stress cracks in the material of the caution sign band due to screw tightening, and to prevent the occurrence of cracks due to the adhesion of oils, acids, alkalis, solvents, etc. It can prevent the deterioration.

Embodiment 3. FIG. 5A is a side view of the resin caution sign strip, and FIG. 5B is a back view of the resin caution sign strip. As shown in the drawing, the marker strip 10 has a protrusion 17 for making a hole for screw tightening, and a protrusion 18 for positioning for setting at the time of mounting by screw tightening or for preventing misalignment after mounting. Further, as many ribs 19 as the front cleats are arranged on the back surface of the caution sign strip.

While the cleat protrudes on the front side of the caution sign belt, there is no rib on the back side so far, and the resin material itself warps due to contraction during cooling after molding of the resin (shape effect). ), But the rib 19 placed on the back side
By balancing the internal stress generated in the material itself during shrinkage, the adverse effect of the shape effect is suppressed, and as a result, this warpage is suppressed.

In addition to the shape effect, the rib 19 on the back surface
Since the core of the mold is also subdivided on the back side due to the addition of, the heat of the filling resin heats only the mold on the front side (cleat side) of the marker strip during molding, and the temperature becomes higher than that on the back side (the back side is usually integrated. It is possible to avoid that the core becomes a core and the temperature is less likely to rise than the front side), and that the difference in molding shrinkage between the front and back becomes large due to the difference in temperature decrease during cooling (the cause of warpage) It is technically difficult to adjust by part).

As a result, the internal stress generated by forcibly attaching the warped resin in a flat shape at the time of screw tightening can be suppressed, so that the generation of crazing due to stress cracks or adhesion of alkalis, solvents, oils, etc. can be suppressed. In addition, the ease with which the screws can be assembled is improved, and even if the resin breaks for some reason during use, the resin does not float up and other devices are damaged and fall off, causing passengers to get caught in the resin dropout point. Since it is less likely to lead to dangers such as the above, effects such as improved safety can be expected.

Fourth Embodiment Oil is usually used to lubricate the driving parts in the man conveyor, and cleaning agent (strong alkaline detergent) is used for cleaning the floor around it, so avoid these adhesion completely. The problem is that it is difficult. Therefore, in the fourth embodiment, a method of preventing these adhesions will be described.

A soft resin washer (made of PE resin or the like) is inserted as a seat for the caution sign band attaching screw. FIG. 6 shows a state in which the soft resin washer is inserted into the gap between the stepped screw and the resin in FIG. The soft resin washer 20 is inserted. It can be similarly inserted between the screw and the resin in FIGS.

It can be expected that the effect of preventing substances such as oil, detergent and solvent, which may cause cracks, from entering the screw-fastened part and avoiding adhesion. If the transparent soft resin washer is used, it is possible to avoid deterioration of the design of the passenger conveyor.

[0036]

According to the present invention, a collar having a predetermined strength is inserted in the screw tightening portion, and the collar receives the stress generated by the screw tightening. It is possible to avoid the occurrence of stress cracks due to tightening, and also to avoid the occurrence of cracks due to the adhesion of oils, acids, alkalis, solvents, etc., and further it is possible to prevent deterioration in designability.

Further, according to the present invention, since the flange is provided around the top of the collar, press-fitting is facilitated and work can be facilitated.

Further, according to the present invention, a stepped screw is used, and the stress due to the screw tightening is carried by the member of the tread plate so that the distance between the head of the screw and the caution sign belt is set to 0, or
Alternatively, since the structure is made to have a gap by making it longer than the height of the cleat recess by a specific value, it is possible to avoid the occurrence of stress cracks in the material of the caution sign band due to screw tightening, and to use oils, acids, alkalis, solvents. It is also possible to prevent the occurrence of cracks due to the adhesion of the like, and to prevent the deterioration of the design.

Further, according to the present invention, since at least one uneven portion is provided on the back surface of the resin warning sign strip, the occurrence of warpage can be suppressed, and the occurrence of stress cracks due to screw tightening, alkali or solvent, It is possible to prevent the occurrence of cracks due to the adhesion of oils, etc., and improve the screw assembly performance.
Further, even if the resin breaks for some reason during use, the resin does not float up, and there is less risk that the other device may be dropped while being broken and a passenger may get caught in the resin drop point.

Further, according to the present invention, the washer made of a material having a predetermined softness is inserted as the seat of the screw into the gap formed under the head of the screw. By blocking, it is possible to secure the sealing property of the stress-occurring portion, prevent the adhesion of oils, acids, alkalis, solvents and the like, and prevent the occurrence of cracks.

[Brief description of drawings]

FIG. 1 is a cross-sectional view showing a first embodiment of the present invention, and is a cross-sectional view showing a state where a resin sign strip is attached to a tread plate via a collar with screws.

FIG. 2 is a cross-sectional view showing a state where a resin marker band is attached to a tread plate with a screw via a collar with a flange.

FIG. 3 is a sectional view showing a second embodiment of the present invention.

FIG. 4 is a diagram showing a case where the stepped screw of FIG. 3 is used to fix the nut with a nut.

5A and 5B are a side view and a rear view of a marker strip showing a third embodiment of the present invention.

FIG. 6 is a view showing a state in which a soft resin washer is inserted into a gap between the stepped screw and the resin in FIG.

FIG. 7 is a perspective view showing an attached state of steps of an escalator.

FIG. 8 is a partial cross-sectional view (perspective view) taken along the line I-I of FIG.

FIG. 9 is a partial front view taken along the line II-II of FIG.

[Explanation of symbols]

1 step, 2 step axis, 3 step chain, 4 step roller, 5 follower roller, 6 skirt guard, 7 treads on which passengers ride, 8 riser, 9
Bracket, 10 caution sign belt.

Claims (5)

[Claims] 1. A tread plate comprising a part of a tread plate provided at the end of a man conveyor tread plate, clearly showing boundaries between mutual steps, and provided with a screw tightening portion for connecting with a base part of the tread plate. In the warning sign band, insert a collar with a predetermined strength into the screw tightening section,
A footnote caution sign strip for a passenger conveyor, characterized in that the collar receives a stress generated by screw tightening. 2. The tread caution sign strip for a passenger conveyor according to claim 1, wherein a flange is provided around the collar top. 3. A tread plate comprising a plurality of tread plates provided at the end of a man conveyor tread, and clearly showing boundaries between mutual steps, and a tread plate having a screw tightening portion for coupling with a base part of the tread plate. In the caution sign strip, use the stepped screw to allow the stress of the screw tightening to be carried by the member of the tread, and set the distance between the head of the screw and the recess of the caution sign strip in the height direction to 0 for just touch. Alternatively, the footboard caution sign belt of the man conveyor is characterized by having a structure with a specific value to have a gap. 4. A tread caution sign strip for clearly indicating boundaries between mutual steps provided at a plurality of end portions of a man conveyor tread, wherein at least one uneven portion is provided on the back surface. The footnote caution sign belt of the passenger conveyor according to any one of 3 to 3. 5. A washer made of a material having a predetermined softness is inserted as a seat of the screw into a gap formed under the head of the screw, according to claim 1. Warning sign belt on the footboard of the man conveyor.