JP2002037576A - Escalator - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce the depth of a main frame of an escalator. SOLUTION: The escalator comprises a plurality of footsteps 8 endlessly connected to each other to be circulated between forward and backward paths, footstep chains for mutually connecting the footsteps, footstep driving wheels on which the footstep chains are wound, for driving the footstep chains, and driving chains for transmitting the power of a driver to the footstep driving wheels. Footstep driving wheel rotation inhibiting mechanisms 25a, 25b, 26a, 26b are provided corresponding to the right and left footstep driving wheels 18a, 18b, which are operated when cutting or abnormal elongation occurs in at least one of right and left driving chains 21a, 21b for inhibiting the rotation of the footstep driving wheels 18a, 18b.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an escalator for transporting a plurality of steps connected endlessly, and more particularly, to a mechanism for preventing a step from descending when a drive chain is abnormal in each of left and right step drive wheels. About escalators.

[0002]

2. Description of the Related Art In recent years, escalators have been installed at a rapid pace against the background of the aging society. In particular, public transportation such as railways requires the use of unspecified people, and people will inevitably move up and down due to the functional relationship of the building structure for transportation where vehicles and traffic lines cross. The escalator is becoming a natural equipment due to the situation and the need for temporary mass transit.

FIG. 11 shows a response to such a social demand.
It is a side view of the example which provided the escalator of the conventional structure in the station building. In the figure, reference numeral 1 denotes an escalator, and an upper main frame 2a, a lower main frame 2b, and an intermediate main frame 2c constitute a main frame 2 of the escalator 1.
Of the building 4 by the support fittings 3a and 3b provided at both ends of the building 4
Is suspended. In the figure, dimensions A, B, and C are the dimensions in the depth direction of the upper main frame 2a, the lower main frame 2b, and the intermediate main frame 2c, respectively.

[0004] In general, escalators are often provided along with stairs in station buildings. In particular, when installing an escalator in an existing station building, the stairs 5 are already installed in the traffic line of the person, and there is no space to install the escalator in a place other than the stairs, or even if there is space, the movement of the people It is common to disassemble or modify the existing steps and part of the platform or concourse and install them alongside the stairs because they cannot be a line.

In many cases, a roof 6 is provided on the upper part of the existing stairs, but since the escalator has the main frame 2 having a predetermined depth dimension as described above,
When installing this, the roof 6 and the specified vertical clearance
Because of the necessity of securing K, it is customary to drill an opening large enough to accommodate the main frame 2 in the existing stairs 5 and platform 7 and drop the main frame 2 into this portion. there were. In the figure, the portion indicated by hatching corresponds to the opening portion drilling work portion.

FIG. 12 is a plan view showing the structure of two upper main frames, FIG. 13 is a side sectional view on the left side of FIG. 12, and FIG.
Is a right side cross-sectional view, in which reference numeral 8 denotes a number of steps arranged along the main frame 2, and each step 8 has a front side roller 9 on its front side left and right and a roller shaft 10. And a rear roller 1 on the rear left and right sides.
1 is provided. The front-side rollers 9 are respectively guided and moved by left and right front-side roller guide rails 12, and the rear-side rollers 11 are respectively guided and moved by left and right rear-side guide rails 13. . A reversing guide 1 on which the rear roller 11 is guided when the step 8 reverses is provided at the end of the rear guide rail 13.
4 are provided.

The steps 8 are connected to each other by left and right step chains 15. The step chains 15 are wound around left and right step drive wheels 18 mounted on a drive shaft 17 supported by left and right bearings 16. Is equipped.
A drive sprocket 19 is provided on the drive shaft 17, and a drive chain 21 driven by a drive device 20 provided in the upper main frame 2a is wound around the drive sprocket 19.

When the driving device 20 is operated, the driving sprocket 19 is driven to rotate by the driving chain 21, the step chain 15 is rotated via both step driving wheels 18, and many steps 8 are simultaneously moved.

A chain guide 22 is in contact with the drive chain 21. The chain guide 22 has an arm 2 at one end of an interlocking shaft 23 rotatable around an axis.
4 (FIG. 13), and the interlocking shaft 23
The other end of the drive shaft 17 is provided with a pawl 26 which can be engaged with a ratchet wheel 25 provided on the side surface of the step drive wheel 18 of the drive shaft 17 (FIG. 14).

Therefore, referring to FIG.
When 1 is cut or remarkably stretched and falls off from the drive sprocket 19, the chain guide 22 moves in the direction of arrow G by its own weight. As a result, the interlocking shaft 23 rotates via the arm 24, and the pawl 26 swings in the direction of arrow H in FIG. 14 and meshes with the ratchet wheel 25. Therefore, the step driving wheel 1 together with the ratchet wheel 25
8, the rotation of the step 8 is prevented. At this time, the left and right step drive wheels 18 are simultaneously stopped because they are connected by the drive shaft 17.

[0011]

As described above, when an escalator is to be newly installed in an existing station building that has been operating for a long time, a part of the building must be significantly remodeled or brought in. In addition, since a part of the building must be temporarily dismantled, enormous cost and construction period are required.

In particular, when an escalator is provided along the stairs, it is necessary to construct a large opening for dropping a part of the main frame into a floor portion such as the stairs and the platform. There was a problem of becoming large. Also, if there is a strength member at the bottom of the stairs, it will be necessary to make a further remodeling such as installing another strength member instead of removing the strength member, which may lead to an increase in cost. There are many problems.

Further, the large-scale remodeling work on the building side results in a longer construction period, and since the work is performed at a station building that is in operation, safety measures such as enclosing the work area and curing are expanded. Also, there is a problem that the loss becomes extremely large, such as an increase in a period in which the user is inconvenienced.

These are problems that occur because the size of the main frame of the escalator in the depth direction is large, and reducing this size is one of the major problems in the conventional escalator.

Therefore, as one means for reducing the dimension of the main frame in the depth direction, the drive shaft connecting the left and right step drive wheels is made thinner or divided into right and left steps so that the empty space is stepped. The conventional step drive wheel rotation suppression mechanism that operates when the drive chain is abnormal is installed on one drive wheel side, and the left and right step drive wheels are driven by the drive shaft that connects it. Therefore, a drive shaft having sufficient strength and thickness is indispensable. In addition, the step 8 has the front roller 9 supported by the step driving wheel 18 and the rear roller 17 is guided by the reversing guide 14 to be reversed.
In order to avoid the drive shaft, the drive shaft must be largely reversed by its diameter, and there is a limit to reducing the depth dimension of the main frame.

SUMMARY OF THE INVENTION In view of the foregoing, an object of the present invention is to provide an escalator capable of reducing the depth of the main frame.

[0017]

The invention according to claim 1 is
A plurality of steps that are connected endlessly and circulate between the forward path and the return path, a step chain that interconnects the steps, a step drive wheel around which the step chain is wound and drives the step chain, and power of the driving device. An escalator having a drive chain for transmitting the step drive to the step drive wheel, a step drive wheel rotation stopping mechanism that acts when the drive chain is cut or abnormally extended to stop rotation of the step drive wheel, It is provided corresponding to the left and right step drive wheels.

According to a second aspect of the present invention, in the first aspect of the invention, the step driving wheel rotation stopping mechanisms provided corresponding to the left and right step driving wheels are configured to operate simultaneously. It is characterized by the following.

According to a third aspect of the present invention, in the first or second aspect of the present invention, the step drive wheel and the drive chain are independently disposed on each of the left and right pairs. .

According to a fourth aspect of the present invention, in the third aspect, a synchronization means is provided between the left and right step chains.

According to a fifth aspect of the present invention, in the invention according to any one of the first to fourth aspects, the step drive wheel rotation restraining mechanism has a cut or abnormal elongation in one of the left and right drive chains. And a stopping mechanism operating means which is activated by the chain malfunction detecting section and simultaneously activates the left and right step drive wheel rotation stopping mechanisms.

According to a sixth aspect of the present invention, in the fifth aspect of the present invention, the chain abnormality detecting section has a displacement mechanism which is always in contact with the drive chain and is displaced when an abnormality occurs.

The invention according to claim 7 is characterized in that, in the invention according to claim 6, the displacement mechanism is connected to the stopping mechanism operating means by a link or a cam mechanism.

The invention according to claim 8 is characterized in that, in the invention according to claim 6, the displacement mechanism is connected to the stopping mechanism operating means by a spring.

According to a ninth aspect of the present invention, in the invention according to the sixth aspect, the displacement mechanism is configured to operate the stopping mechanism operating means by an electromagnet.

The invention according to claim 10 is the invention according to claims 1 to 9
In the invention according to any one of the above, the step drive wheel rotation stopping mechanism has a claw that meshes with a ratchet wheel provided on the step drive wheel.

[0027] The invention according to claim 11 is the first to ninth inventions.
In the invention according to any one of the above, the step drive wheel rotation stopping mechanism has a brake arm pressed against the friction drum.

The invention according to claim 12 is the invention according to claims 1 to 1
In the invention according to any one of the first to third aspects, the displacement mechanisms of the left and right chain abnormality detection units are connected by a connecting rod, and the left and right stopping mechanism operating means are linked to the connecting rod. .

[0029]

Embodiments of the present invention will be described below with reference to the accompanying drawings. In the drawings, the same parts as those in FIGS. 11 to 14 are denoted by the same reference numerals, and detailed description thereof will be omitted.

In FIG. 1, reference numerals 18a and 18b denote first drive shafts 17a disposed on the left and right in the upper main frame 2a, respectively.
And the first and second step drive wheels mounted on the second drive shaft 17b, and the respective step drive wheels 18
a, 18b to the first and second step chains 15a, 15b, respectively.
15b is wound. A first drive sprocket 19a and a first ratchet wheel 25a are further mounted on the first drive shaft 17a, and a second drive sprocket 19b and a second ratchet are mounted on the second drive shaft 17b. The wheel 25b is mounted. And
The first drive sprocket 19a and the second sprocket 19b have a first drive chain 21a and a second drive chain 21 driven by the drive device 30, respectively.
b is wound.

When the first drive chain 21a and the second drive chain 21b are respectively driven by the drive device 30, the respective drive sprockets 19a and 19b are rotationally driven, and are driven via the respective step drive wheels 18a and 18b. The left and right step chains 15a and 15b are rotated, and each step 8 is guided and moved by each of the guide rails 12 and 13.

Chain guides 22a and 22b are respectively in contact with the left and right first drive chains 21a and second drive chains 21b from above. As shown in FIG. 2, the chain guides 22a and 22b are pivotally attached to one ends of bell cranks 32a and 32b that can swing about shafts 31a and 31b, respectively, and the other ends of the bell cranks 32a and 32b. Are provided with push bolts 33a and 33b.

On the other hand, the first and second drive chains 2
Above 1a, 21b, there is provided an interlocking shaft 34 extending in the left-right direction and rotatable around an axis. At both ends of the interlocking shaft 34, pawls 26a engageable with the ratchet wheels 25a and 25b. , 26b are fixed. And
The claws 26a, 26b and the bell cranks 32a, 32
and b are connected by springs 35a and 35b, respectively.

The step driving wheels 18a and 18b
Are connected by a synchronous shaft 36 to a position where the steps 8 are not buffered when the steps 8 are reversed, and are engaged with the left and right first and second steps chains 15a and 15b.
Synchronous sprockets 37a and 37b for guiding 5a and 15b are provided, and a chain press 38 for engaging with the step chains 15a and 15b is provided above the synchronous sprockets 37a and 37b.

Thus, one drive chain, for example, the first drive chain
When the drive chain 21a is cut or one of the drive chains 21a is significantly elongated, as shown in FIG. 3, the first chain guide 22a in contact with the first drive chain 21a is lowered by its own weight. At this time the first
The bell crank 32a to which the chain guide 22a is connected rotates in the direction of arrow D about the shaft 31a, and the push bolt 33a pushes the claw 26a, whereby the claw 26a meshes with the first ratchet wheel 25a, The rotation of the first drive sprocket 19a and the first step drive wheel 18a is stopped.

On the other hand, on the other uncut second drive chain 21b side, when the pawl 26a is pushed by the push bolt 33a, the other pawl 26b connected by the interlocking shaft 34 also operates at the same time. 2 ratchet wheels 2
5b, the second drive sprocket 19b and the second drive sprocket 19b.
Of the step driving wheel 18b is also stopped, and the movement of the step 8 is stopped. At this time, the spring 35b extends and the operation of the other claw 26b is not hindered.

Here, especially when the escalator is operated in the ascending direction, the first and second stepping drive wheels 18a and 18b are cut after the first drive chain 21a is cut off.
Until the stop, the first step drive wheel 18a tries to rotate in the descending direction due to the load, and the second step drive wheel 18b tries to rotate in the up direction by the power. For this reason, the left and right step chains are pulled by the forces in opposite directions, but the synchronization of the step chains is prevented by the synchronous sprockets 37a and 37b connected by the synchronous shaft. In this case, the chain pressing 38 prevents the step chain from coming off and skipping frames.

As described above, the left and right drive sprockets 19
Since the a, 19b and the step drive wheels 18a, 18b are simultaneously stopped by the step drive wheel rotation stopping mechanisms such as the claws 26a, 26b and the ratchets 25a, 25b, the left and right step drive wheels 18a, 18b need to be connected by the shaft. Alternatively, the steps 8 may be connected by a shaft having a small shaft diameter, and the steps 8 can be inverted in a small space.

FIGS. 5 and 6 are views showing a second embodiment of the present invention, and are views showing a schematic configuration on the first drive sprocket 19a side. In FIG. 5, a tensioning device 40 is pressed against the first drive chain 21a from above by a spring 42 attached to a bracket 41. A roller 44 is attached to the tensioning device 40 via a lever 43, and the roller 44 is pressed against a cam-shaped plate 45 mounted on a first claw 26 a swingably provided by an interlocking shaft 34. ing. Further, the second drive sprocket 19b side is similarly configured. The other points are the same as those shown in FIGS.

When the first drive chain 21a is cut, the tensioning device 40 pressed against the first drive chain 21a by the spring 42 moves in the direction of arrow E as shown in FIG. Accordingly, the cam-shaped plate 45 is pressed by the roller 44 with the movement of the tensioning device 40, and the first claw 26 a is swung about the interlocking shaft 34 via the cam-shaped plate 45. Then, the first pawl 26a is engaged with the ratchet wheel 25a, and the rotation of the first drive sprocket 19a and the first step drive wheel 18a is stopped. Further, the second pawl 26b connected by the interlocking shaft 34 also operates at the same time, the rotation of the second drive sprocket 19b and the second step drive wheel 18b is stopped at the same time, and the movement of the step 8 is stopped.

Thus, the left and right driving sprockets 19a, 19b are simultaneously stopped by the engagement of the claws 26a, 26b with the ratchet wheels 25a, 25b, respectively.
The same effect as in the first embodiment can be obtained. Further, the tensioning device 40 can constitute a chain abnormality detecting section and also serve as a tensioning device for a drive chain.

FIGS. 7 and 8 show a third embodiment of the present invention. A tensioning device 40 is pressed from above by a spring 42 on the first drive chain 21a. 40 is provided with a limit switch 46. On the other hand, the upper main frame 2a is provided with a portion for turning on the limit switch 46 in a normal state.
An L-shaped bracket 47 is provided.

On one side of the first driving sprocket 19a, a friction drum 48 is coaxially provided so as to rotate integrally with the first driving sprocket 19a.
A brake arm 50 having a friction plate 49 adhered to the inner surface is provided on an outer peripheral portion of the friction drum 48, and is urged by a spring 51 against the friction drum 48 in a pressing direction. Further, on one side of the brake arm 50, there is provided an electromagnet 52 which is normally energized and keeps the brake arm 50 open. Further, the second drive sprocket 19b side is similarly configured.

Thus, as shown in FIG. 8, when the first drive chain 21a is cut, the tensioning device 40 pressed against the first drive chain 21a by the spring 42.
Moves in the direction of arrow F. As a result, the limit switch 46 that has been ON is turned OFF. When the limit switch 46 is turned off in this way, the excitation of the electromagnet 52 is released and the holding of the brake arm 50 is released. Therefore, the friction plate 49 is pressed against the friction drum 48 by the spring 51 via the brake arm 50, and the rotation of the first drive sprocket 19a and the first step drive wheel 18a is stopped. Further, the second drive chain 21b also receives the signal of the limit switch 46, and similarly, the rotation of the second drive sprocket 19b and the second step drive wheel 18b is stopped, and the movement of the step 8 is stopped. .

Therefore, this embodiment has the same effects as the first embodiment.

FIGS. 9 and 10 show a fourth embodiment of the present invention. The other ends of the left and right bell cranks 32a and 32b are connected to those shown in FIGS. They are connected by a rod 53. In the case of fixing, connecting rod 53
Are swingable to some extent with respect to each of the bell cranks 32a and 32b. Further, an intermediate portion between the right and left claws 26a and 26b is also connected by a connecting rod 54. An intermediate portion between the connecting rod 53 and the connecting rod 54 is connected by an operating rod 55.

Then, as shown in FIG. 10, the second drive chain 22b is cut and the second chain guide 22b is cut.
When b descends, the bell crank 32b swings accordingly, and one end of the connecting rod 53 moves in the direction of the claw 26b.
Therefore, according to the movement of the connecting rod 53, the operating rod 55
The connecting rod 54 is moved forward, and the left and right claws 26a, 2
6b correspond to the respective ratchet wheels 25
The rotation of the drive sprockets 19a, 19b and the step drive wheels 18a, 18b is stopped.

Therefore, in this case as well, the left and right step drive wheels 18a and 18b can be reliably stopped at the same time as in the other embodiments, and the same effect as in the other embodiments can be obtained.

In each of the above embodiments, the case where the step is reversed and the direction is changed has been described. However, the same applies to the escalator in which the step is turned with the step surface thereof facing upward. Can be implemented.

[0050]

As described above, the present invention provides a step drive wheel stopping mechanism which acts when the drive chain is cut or abnormally extended to stop the step drive wheel.
Since the left and right step drive wheels are provided corresponding to the left and right step drive wheels, there is no need to connect the left and right step drive wheels to each other with a large-diameter drive shaft, and even if the drive shaft is deleted or the shaft diameter is reduced, the drive chain is abnormal. Sometimes passengers and equipment can be protected. Therefore, the space created by removing the drive shaft or the like can be used as a space for reversing the steps, the main frame, particularly the upper main frame, can be reduced in the depth direction and installed in an existing station building or the like. In such a case, it is only necessary to construct an opening at the stairs only in the lower part of the main frame, which can greatly reduce the burden of construction work on the building side, further shortening the construction period, and applying it to users This has the effect of reducing inconvenience.

[Brief description of the drawings]

FIG. 1 is a plan view showing a configuration inside an upper main frame of an escalator according to a first embodiment of the present invention.

FIG. 2 is a left side sectional view of an upper main frame of the escalator according to the first embodiment of the present invention.

FIG. 3 is a side view at normal time of the drive wheel rotation stopping mechanism according to the first embodiment of the present invention.

FIG. 4 is an operation explanatory view of the first embodiment of the present invention.

FIG. 5 is a side view of a drive wheel rotation stopping mechanism according to a second embodiment of the present invention.

6 is an operation explanatory view of the drive wheel rotation stopping mechanism shown in FIG.

FIG. 7 is a side view of a drive wheel rotation stopping mechanism according to a third embodiment of the present invention at a normal time.

FIG. 8 is an operation explanatory view of the drive wheel rotation stopping mechanism shown in FIG. 7;

FIG. 9 is a plan view showing a fourth embodiment of the present invention.

FIG. 10 is an operation explanatory view of the drive wheel rotation stopping mechanism shown in FIG. 9;

FIG. 11 is a diagram showing an installation example of a conventional escalator.

FIG. 12 is a plan view showing a configuration inside an upper main frame of a conventional escalator.

FIG. 13 is a left side view of the inside of the upper main frame of the conventional escalator.

FIG. 14 is a right side view of the inside of an upper main frame of a conventional escalator.

[Explanation of symbols]

 Reference Signs List 1 escalator 2 main frame 5 stairs 6 roof 8 step 15a first step chain 15b second step chain 18a first step drive wheel 18b second step drive wheel 19a first drive sprocket 19b second drive sprocket 20 , 30 drive device 21a first drive chain 21b second drive chain 22a first chain guide 22b second chain guide 23 interlocking shaft 24 arm 25a first ratchet wheel 25b second ratchet wheel 26a first claw 26b Second claw 32a First bell crank 32b Second bell crank 33 Push bolt 34 Interlocking shaft 36 Synchronous shaft 37a, 37b Synchronous sprocket 40 Tensioning device 41 Bracket 43 Lever 44 Roller 45 Cam plate 46 Limit switch 47 L type Bracket 4 The friction roller 50 the brake arm 52 electromagnet 53 connecting rod

 ────────────────────────────────────────────────── ─── Continuing on the front page (72) Inventor Yoshio Ogimura 1 Toshiba-cho, Fuchu-shi, Tokyo F-term in Fuchu Works, Toshiba Corporation (reference) 3F321 AA04 AA05 CA17 CA24 EA14 EB02 EB03 GA07

Claims (12)

[Claims] 1. A plurality of steps connected endlessly and circulating between a forward path and a return path, a step chain connecting the steps to each other, a step drive wheel around which the step chain is wound and drives the step chain. An escalator having a drive chain for transmitting the power of the drive device to the step drive wheel, wherein a step drive wheel rotation that acts when the drive chain is cut or abnormally extended to stop rotation of the step drive wheel. An escalator in which a stopping mechanism is provided corresponding to each of the left and right step drive wheels. 2. The escalator according to claim 1, wherein the step drive wheel rotation stopping mechanisms provided corresponding to the left and right step drive wheels are configured to operate simultaneously. 3. The escalator according to claim 1, wherein the step drive wheel and the drive chain are provided independently on the left and right, one set each. 4. The escalator according to claim 3, wherein a synchronization means is provided between the left and right step chains. 5. A step drive wheel rotation restraining mechanism includes a chain abnormality detecting unit for detecting that a cutting or abnormal extension has occurred in one of the left and right drive chains, and is operated by the chain abnormality detecting unit. The escalator according to any one of claims 1 to 4, further comprising a stop mechanism operating means for simultaneously operating the step drive wheel rotation stop mechanism. 6. The escalator according to claim 5, wherein the chain abnormality detecting section has a displacement mechanism that is always in contact with the drive chain and generates a displacement when an abnormality occurs. 7. The escalator according to claim 6, wherein the displacement mechanism is connected to the stopping mechanism operating means by a link or a cam mechanism. 8. The escalator according to claim 6, wherein the displacement mechanism is connected to the stopping mechanism operating means by a spring. 9. The escalator according to claim 6, wherein the displacement mechanism is configured to operate the stopping mechanism operating means by an electromagnet. 10. The escalator according to claim 1, wherein the step drive wheel rotation stopping mechanism has a claw that meshes with a ratchet wheel provided on the step drive wheel. 11. The escalator according to claim 1, wherein the step drive wheel rotation stopping mechanism has a brake arm press-fitted on the friction drum. 12. The displacement mechanism of the left and right chain abnormality detecting sections is connected by a connecting rod, and the left and right stopping mechanism operating means are interlocked to the connecting rod. The escalator according to any one of 11 above.