JPH0942394A - Jig for exchanging chain - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a jig capable of facilitating an exchange work of a chain for driving a handrail of an escalator and the like at a low price by providing an upper plate and a lower plate of elastic material, rectangular shape in plane view, U-shaped section, and having a little larger width than the width of a chain, and joining both plates together so as to be back to back in the opposite directions. SOLUTION: In an exchange work of a chain 5 driving a movable handrail of an escalator, at first the chain 5 is loosened, a jig 100 is fitted to the upper part of a sprocket gear 4 and inserted. At this time, by inserting the jig 100 between the gear 4 and the chain 5, the lower face of the lower plate 12 of the jig 100 is contacted with the teeth 40 of the gear 4 and climbs over the teeth while pinching the teeth 40. Simultaneously, the upper plate 11 lifts the chain 5 upward, moves while releasing the engaged state of the chain 5 against the teeth 40, and advances while curving following to the outer circumference of the gear 4. When the jig 100 advances by about 1/4 of the circumference of the gear 4, it is detached in the engaged state with the gear 4 by the dead weight of the chain 5.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a jig for replacing a chain on a sprocket gear, which is used as a driving means for a moving handrail for an escalator, and particularly to a jig for easily removing the chain from the sprocket gear for a short time. The present invention relates to a chain replacement jig that can complete replacement work.

[0002]

2. Description of the Related Art Conventionally, in a drive device such as a moving handrail for an escalator which is a combination of a sprocket gear and a chain hung on the sprocket gear, when replacing only the chain, the connecting portion of the chain is rotated while rotating the sprocket gear. After moving to the exchangeable position, the old and new chains are exchanged by disconnecting the connecting part.

FIG. 10 is a side view showing, in a partial cross-sectional view, the periphery of a drive portion of a general handrail for an escalator. In the figure, 1 is a drive device for driving the entire escalator body, and 2 is a drive device. A main chain 3 driven by the drive device 1, 3 is a main sprocket gear that is driven to rotate by meshing with the main chain 2, and 4 is a sprocket gear that rotates integrally with the main sprocket gear 3 in a coaxial structure.

Reference numeral 5 is a chain driven by meshing with the sprocket gear 4, 4a is a sprocket gear rotationally driven by meshing with the chain 5, 6 is a chain driven by meshing with the sprocket gear 4a, and 7 is a chain 6 A nylon roller that is driven to rotate by a coaxial structure with a sprocket gear (not shown) that meshes with, a moving handrail of an escalator that is driven by abutting the outer periphery of the roller 7, and a connecting portion of the chain 5. is there.

The drive unit 1 also functions as drive means for driving the moving handrail 8. Further, the sprocket gears 4 and 4a, the chain 5 meshing with these, the chain 6 meshing with the sprocket gear 4a, and
The plurality of rollers 7 form a drive mechanism for driving the moving handrail 8.

FIG. 11 is a side view showing a partial cross-sectional view of the chain 5 during replacement work, and 1 to 8 are the same as those described above. Here, the chain 6 and the rollers 7 which are not directly related to the replacement work of the chain 5 are not shown. In FIG. 11, 10 is a new chain that is replaced in place of the chain 5.

P1 and P2 are workers who are replacing the chains 5 and 10, and P1 is a new chain 10
Is a worker who is sending out the old chain 5 to be replaced. Although not shown here, in practice, the brake mechanism (not shown) of the drive device 1, the main chain 2, and the main sprocket gear 3 is opened to drive the drive device 1, the main chain 2, and the main sprocket gear. There are other workers who move the 3 manually.

12 together with FIGS. 10 and 11.
A specific procedure of the conventional chain replacement work when the driving means of the moving handrail 8 of the escalator is taken as an example will be described with reference to the flowchart of FIG. For chain replacement work, manually release the brake and drive 1
Workers (not shown) moving the old and new chains 5 and 10 (see FIG. 11) to replace workers P1 and P
It will be performed by 2 people and 3 people.

When replacing the chain 5 which drives the moving handrail 8 of the escalator, first, the manhole of the escalator raising and lowering opening covering the drive unit 1 and the machine room is removed, and the drive unit 1 is forcibly operated to drive the chain 5. Check the connecting portion 9 of.

Subsequently, the drive device 1 is stopped, the brakes of the main chain 2 and the main sprocket gear 3 are released, and the main chain 2 and the main sprocket gear 3 are moved by a manual winding operation, whereby the escalator is manually lowered. Drive Then, the steps of the escalator corresponding to the position of the connecting portion 9 are removed for a total of 6 steps, each including the upper and lower three steps around the connecting portion 9 (step S105).

Next, the tension of the chain 5 is relaxed to the maximum, and the chain 5 is removed from the teeth of the sprocket gear 4a having a small diameter (step S106). At this time, the chain 5 cannot be removed from the sprocket gear 4 having a large diameter. Subsequently, the chain 5 is moved while manually driving the escalator, and the connecting portion 9 is moved to the workers P1 and P2.
After moving to the position of (1), one end of the chain 5 is removed from the connecting portion 9 and the chain 5 is recovered from the machine room as indicated by the arrow in FIG. 11 (step S107).

At the same time, one end of the new chain 10 is connected to the connecting portion 9, and the chain 10 is carried in as shown by the arrow in FIG. 11 while manually driving the escalator (step S108). Replace 10.
Finally, the new chain 10 is rotated around the shaft of the sprocket gear 4a (step S109), the other end of the old chain 5 is removed from the connecting portion 9, the other end of the new chain 10 is connected, and the new chain 10 is connected. Is completed (step S110).

[0013] In such chain replacement work, it takes time to confirm the position of the connecting portion 9 of the chain 5, and then the connecting portion 9 of the chain 5 is moved by manual rotation of the sprocket gear 4. Therefore, it takes about 4 hours to replace each chain 5 because it takes time. In particular, when the chain 5 has two left and right structures, it is impossible to perform the chain replacement work at the same time, and the work time is about 8 hours.

[0014]

As described above, since the chain 5 cannot be easily removed from the sprocket gear 4 in the conventional chain replacement work, the position of the connecting portion 9 of the chain 5 must be confirmed in advance. , While manually moving the escalator, after removing the steps corresponding to the connecting portion 9, it is necessary to match the position of the connecting portion 9 to the working position and replace it with a new chain 10, which is inefficient and takes a lot of work time. There was a problem that it took.

The present invention has been made in order to solve the above problems, and is applied to the replacement work of a chain or the like used as a drive means of a moving handrail of an escalator to realize labor saving of the work. The purpose is to obtain a jig for chain replacement.

[0016]

A chain replacement jig according to claim 1 of the present invention is a jig for replacing a chain which is driven by meshing with a sprocket gear.
The elastic plate having an extended shape is composed of an upper plate and a lower plate, and the upper plate and the lower plate have a U-shaped cross section and are back-joined in opposite directions to each other. It is formed slightly larger than the width of the sprocket gear and chain.

A chain replacement jig according to a second aspect of the present invention is the chain replacement jig according to the first aspect, wherein the upper plate and the lower plate are
It is made of hard plastic.

Further, a chain replacement jig according to a third aspect of the present invention is the chain replacement jig according to the first or second aspect, wherein the upper plate and the lower plate each have a U-shaped fringe portion having a tip portion of about 45. It was cut to °.

Further, a chain replacement jig according to a fourth aspect of the present invention is the chain replacement jig according to any one of the first to third aspects, wherein the upper plate and the lower plate are at the same position along their respective center lines. It has a plurality of elongated holes formed in, and is sewn with a nylon-coated wire through the elongated holes.

Further, a chain replacement jig according to a fifth aspect of the present invention is the chain replacement jig according to any one of the first to fourth aspects, wherein the upper plate and the lower plate are at least partially adhered to each other. Is.

Further, a chain replacement jig according to a sixth aspect of the present invention is the chain replacement jig according to any one of the first to fifth aspects, wherein the position of the tip of the lower plate is the position of the tip of the upper plate. Is shifted backward by a predetermined distance.

Further, a chain replacement jig according to a seventh aspect of the present invention is the chain replacement jig according to any one of the first to sixth aspects, wherein the upper plate and the lower plate are provided along the respective U-shaped fringe portions. It has a plurality of slits formed in a comb tooth shape.

[0023]

BEST MODE FOR CARRYING OUT THE INVENTION

Embodiment 1. Embodiment 1 of the present invention will be described below with reference to the drawings. 1 to 3 are respectively a perspective view, a plan view, and a front view showing Embodiment 1 of the present invention, and FIGS. 4 to 7 are Embodiment 1 of the present invention, respectively.
FIG. 6 is an enlarged perspective view, an enlarged side view, a side view, and a side view showing a partial cross-sectional view showing a working state using the.

1 to 7, 1 to 5, 8 to 10,
P1 and P2 are the same as described above, and although not shown, the chain 6 and the roller 7 are as shown in FIG. In FIGS. 4 and 5, 40 is a tooth of the sprocket gear 4. Reference numeral 100 denotes a jig for replacing the chain, which is made of an elastic material having an extended shape, and is inserted into the meshing portion between the sprocket gear 4 and the chain 5 during the chain replacement work.

A jig 10 is formed by integrally forming 11 and 12.
The upper and lower plates forming 0, 11a is the tip of the upper plate 11, 12a is the tip of the lower plate 12, and D is the amount of displacement of the tip 12a of the lower plate 12 with respect to the tip 11a of the upper plate 11. A predetermined distance, 13 is a plurality of elongated holes formed at the same position along each center line of the upper plate 11 and the lower plate 12, and 14 is for connecting the upper plate 11 and the lower plate 12 through the elongated holes 13. Is a nylon-coated wire.

The upper plate 11 and the lower plate 12 are fixed so as not to come off from the teeth 40 of the chain 5 and the sprocket gear 4.
Each of them has the same cross-sectional shape, that is, a U-shape, as shown in FIG. The U-shaped widths of the upper plate 11 and the lower plate 12 are the same as those of the sprocket gear 4
It is formed to be slightly larger than the width of the chain 5.

The upper plate 11 and the lower plate 12 have their U-shaped fringe tips 11a and 12a cut obliquely so that the sprocket gear 4 and the chain 5 can be smoothly guided. That is, the jig 100
The upper plate 11 smoothly lifts the chain 5, and
In order that the lower plate 12 can smoothly advance along the teeth 40 of the sprocket gear 4, the tips 11a and 12
For example, a is cut at an angle of about 45 °.

Further, in order that the jig 100 may smoothly ride on the teeth 40 of the sprocket gear 4, the tip portion of the jig 100 is such that the tip portion 12a of the lower plate 12 is the tip portion 1 of the upper plate 11.
It has a structure that is displaced rearward by a predetermined distance D (about 10 mm) with respect to 1a.

Further, the jig 1 is set so that the jig 100 can cover about 1/4 to 1/3 of the outer circumference of the sprocket gear 4.
The length of 00 is set to about 1060 mm. Also, the wire 14 at the rear end of the jig 100 can be fixed so that the jig 100 can be fixed to the angle of the tensioner portion (not shown) of the chain 5 during the replacement work of the chain 5.
Is set to about 450 mm.

Further, the upper plate 11 and the lower plate 12 have smooth surfaces along the outer circumference of the sprocket gear 4 so as to be curved and to smoothly move the drive chain 5 of the moving handrail 8. It is made of smooth hard plastic. In addition, the upper plate 11 and the lower plate 12
Is sewn with a wire 14 so that the structure of the upper plate 11 and the lower plate 12 combined in the upside-down direction can flexibly follow the jig 100 even when the jig 100 is curved. Further, a part of the upper plate 11 and the lower plate 12 may be adhered to each other to prevent the tip portions 11a and 12a from being displaced.

As the upper plate 11 and the lower plate 12,
For example, it is possible to use the one in which the ducts for organizing electric wires such as a switchboard are cut, and the same parts are combined on the back surface.

Next, referring to the flow chart of FIG. 8 together with FIGS. 4 to 7, the procedure of the chain replacement work using the first embodiment of the present invention shown in FIGS. 1 to 3 will be described. Also in this case, similarly to the above, the replacement work of the chain 5 that drives the moving handrail 8 of the escalator is taken as an example. In FIG. 8, S106 and S110 are the same steps as described above, and S104 is the above-mentioned step. It corresponds to S107 to S109.

First, without checking the connecting portion 9 and without manually driving the escalator, the driving device 1 is stopped and the manhole of the escalator raising / lowering opening is opened to set any of the steps to 6 steps. It is removed (step S101). Then, as described above, the chain 5 is loosened and removed from the sprocket gear 4a (step S10).
6) After that, as shown in FIGS. 4 and 5, the jig 100 is attached to the upper portion of the sprocket gear 4 and inserted (step S103).

At this time, by inserting the jig 100 between the sprocket gear 4 and the chain 5, the jig 1
The lower surface of the lower plate 00 of 00 has teeth 40 of the sprocket gear 4.
And get over the teeth 40 while sandwiching them. At the same time, the upper plate 11 moves upward while lifting the chain 5 upward, releasing the meshed state of the chain 5 with the teeth 40, and advances while curving along the outer periphery of the sprocket gear 4 (see FIG. 6). In addition, in order that the upper plate 11 and the lower plate 12 are easily bent, the respective tip portions 11a and 12a are
Slits (see FIG. 5) may be formed in the vicinity of.

As shown in FIG. 6, when the jig 100 advances to about 1/4 to 1/3 of the circumference of the sprocket gear 4, the tension of the chain 5 is further relaxed to the maximum in step S106. Therefore, the meshing state with the sprocket gear 4 is released due to the weight of the chain 5. Therefore, the chain 5 is completely separated from the teeth 40 of the sprocket gear 4 and can be freely and quickly moved by itself.

Hereinafter, the above-mentioned steps S107 to S109.
Similarly to the above, the old chain 5 is replaced with a new chain 10 (step S104), and the connection of the chains 10 is completed (step S110). At this time, since the chain 5 freely moves along the upper surface of the upper plate 11 of the jig 100, the old chains 5 are collected and the new chains 10 are sent out quickly by the workers P1 and P2.

That is, since the upper plate 11 and the lower plate 12 are made of a hard U-shaped hard plastic material having a smooth surface, it is difficult for the upper plate 11 and the lower plate 12 to come off from the teeth 40 of the sprocket gear 4 and the chain 5 does not come off easily. The chain 5 can be moved smoothly.

In addition, the tip portion 11 of the upper plate 11 of the jig 100
Since the upper surface of a is cut at an angle of about 45 °, the chain 5 can be smoothly lifted. In addition, since the upper plate 11 and the lower plate 12 are sewn with the nylon-coated wire 14, the structure in which the jigs 100 are bent upside down is flexibly maintained, and
It is possible to absorb the deviation of the joint surface between the upper plate 11 and the lower plate 12 when the jig 100 is curved.

Further, the tip portion 12 of the lower plate 12 of the jig 100
Since a is displaced rearward by a predetermined distance D of about 10 mm with respect to the tip portion 11a of the upper plate 11, the lower plate 12 can smoothly ride on the teeth 40 of the sprocket gear 4. By inserting the jig 100 having the above structure between the chain 5 and the sprocket gear 4, the jig 100
The tip of the chain rides smoothly on the teeth 40, and the chain 5
Can be floated from the sprocket gear 4.

Here, the sprocket gear 4 and the chain 5
The principle of releasing the engagement with the using the jig 100 is as follows (a) and (b). (A) The tip of the jig 100 has teeth 4 of the sprocket gear 4.
0, and ride along the surface of the tooth 40,
Lift the chain 5 from the tooth 40. (B) At this time, the chain 5 is held on the upper surface of the jig 100. In addition, the jig 100
Since the teeth 40 are sandwiched on the lower surface of the jig 100, the jig 100 does not come off from the sprocket gear 4. (C) The jig 100 is 1/4 of the outer circumference of the sprocket gear 4.
When it is inserted up to about ⅓, the chain 5 comes off under its own weight at the lower part of the sprocket gear 4, so that the entire chain 5 can be completely floated.

As described above, since the meshing portion between the sprocket gear 4 and the chain 5 can be easily and completely released, the chain 5 can be quickly moved by itself without rotating the sprocket gear 4. it can. Therefore, the working time can be greatly reduced and the confirmation and movement of the connecting portion can be performed accurately in a short time.
The replacement work time of the book chain 5 can be completed in about 0.5 hours. Further, the traveling time of the worker is only the time required to carry in and carry out the old and new chains 5 and 10, and the safety of the work is improved.

Embodiment 2. In the first embodiment, the upper plate 11 and the lower plate 12 that form the jig 100 are formed of elastic plastic, but the upper plate 11 and the lower plate 12 may be made more flexible so as to follow the outer periphery of the sprocket gear 4. A plurality of slits may be provided along the extending direction of the plate 11 and the lower plate 12.

FIG. 9 is a perspective view showing a second embodiment of the present invention in which slits are provided to improve the flexibility of the jig 100, and 100, 11, 11a, 12, 12a, 13 and 14 are the same as those described above. It is similar. 11b and 12b
Is a plurality of slits formed in a comb-like shape along each fringe portion (side end portion) of the upper plate 11 and the lower plate 12, and 11b and 12b which are combined upside down even when the jig 100 is curved. The structure of is designed to be more flexible.

Thus, the slits 11b and 12b
By providing the jig 100 with the sprocket gear 4
Since it is easy to bend along the outer peripheral surface of the, the jig 100 can be easily inserted during the replacement work of the chain 5, and the working time can be further shortened.

In the first and second embodiments, the chain 5 for driving the moving handrail 8 for the escalator is used.
Although the case of exchanging the sprocket gear has been described as an example, it is needless to say that the case of exchanging the chain that cooperates with the sprocket gear can be applied to other applications and has the same effect.

[Brief description of drawings]

FIG. 1 is a perspective view showing Embodiment 1 of the present invention.

FIG. 2 is a plan view showing the first embodiment of the present invention.

FIG. 3 is a front view showing the first embodiment of the present invention.

FIG. 4 is an enlarged perspective view showing a working state according to the first embodiment of the present invention.

FIG. 5 is an enlarged side view showing a working state according to the first embodiment of the present invention.

FIG. 6 is a side view showing a working state according to the first embodiment of the present invention.

FIG. 7 is a side view showing a working state of the first embodiment of the present invention in a partial sectional view.

FIG. 8 is a flowchart showing a work procedure according to the first embodiment of the present invention.

FIG. 9 is a perspective view showing a second embodiment of the present invention.

FIG. 10 is a side view showing a driving device of a general escalator in a partial sectional view.

FIG. 11 is a side view showing a partial cross-sectional view of a state during a conventional chain replacement work.

FIG. 12 is a flowchart showing a conventional chain replacement work procedure.

[Explanation of symbols]

4 sprocket gears, 5 chains, 11 upper plates, 1
1a, 12a tip part, 11b, 12b slit, 1
2 lower plate, 13 oblong hole, 14 wire, 100 jig, D
Predetermined distance.

Claims (7)

[Claims] 1. A jig for replacing a chain which is driven by meshing with a sprocket gear, comprising an upper plate and a lower plate of an elastic material having an extended shape, wherein the upper plate and the lower plate have a cross section of A chain having a letter shape and joined to each other in a reverse direction, and the widths of the U-shapes of the upper plate and the lower plate are slightly larger than the widths of the sprocket gear and the chain. Replacement jig. 2. The chain replacement jig according to claim 1, wherein the upper plate and the lower plate are made of hard plastic. 3. The chain replacement according to claim 1, wherein the upper plate and the lower plate are each provided with a U-shaped fringe portion whose front end is cut at about 45 °. Jig. 4. The upper plate and the lower plate have a plurality of elongated holes formed at the same positions along respective center lines,
The chain replacement jig according to any one of claims 1 to 3, wherein the jig is sewn with a wire covered with nylon through the elongated hole. 5. The chain replacement jig according to any one of claims 1 to 4, wherein the upper plate and the lower plate are bonded to each other at least partially. 6. The position according to claim 1, wherein the position of the tip portion of the lower plate is displaced rearward by a predetermined distance from the position of the tip portion of the upper plate. Jig for chain replacement described. 7. The upper plate and the lower plate have a plurality of slits formed in a comb-like shape along the fringe portions of the respective U-shapes. The chain replacement jig described in any of the above.