JPH0219077B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to escalators, and particularly to a safety device for detecting abnormalities in follower rollers provided at the lower ends of steps.

[Prior Art] FIGS. 3 and 4 show a conventional curved escalator. In the figures, 1 is the main frame of the curved escalator, which is arranged in an arc shape and inclined in a horizontal projection plane. 2 is a conveyance path configured in the main frame 1, with an outgoing path 2a on the upper surface side of the main frame 1;
An inverted portion 2b is formed at the upper end, a return path 2c is formed at the bottom side of the main frame 1, and an inverted portion 2d is formed at the lower end of the main frame 1, so that it is configured in an endless shape. 3 is a step having a fan-shaped plane and a large number of steps are successively arranged on the conveyance path 2; 4 is a step shaft provided in the width direction of the step 3;
Reference numeral 5a denotes an outer drive roller that is pivotally supported on the outer arcuate end of the step shaft 4, 5b is an inner drive roller that is pivoted on the inner arcuate end of the step shaft 4, and 6a is fixed to the main frame 1 and arranged along the conveyance path 2. An outer drive rail 6b guides and supports the outer drive roller 5a, and an inner drive rail 7 similarly guides and supports the inner drive roller 5b.
a is an outer following roller provided on the outside of the arc at the edge near the bottom of the step 3; 7b is an inside follow roller provided on the inside of the arc at the edge near the bottom of the step 3; 8a is fixed to the main frame; The outer follower rail 8b is arranged along the inner follower roller 7 and guides and supports the outer follower roller 7a.
9a is an outer step chain that is arranged along the conveyance path 2 and connects the arcuate outer end of the step shaft 4; 10 is an inner follower rail that guides and supports the step shaft 4; A side roller that supports the load in the direction of the center of the circular arc of the conveyance path 2 of the step 3 mounted at right angles to the drive roller 5a,
It is designed to be guided and supported by the arcuate outer surface of the outer drive rail 6a. 11 is a drive device provided at the upper end of the main frame 1, and 11a is a drive device for both step chains 9a, 9.
A chain gear 12 of a drive device 11, around which the upper reversing part 2b of the conveyance path 2 is wound, is driven by a drive machine 11b, and 12 is a chain gear provided at the lower end of the main frame 1 to convey both step chains 9a and 9b. This is a tension wheel device that applies tension to the step chains 9a and 9b, around which the road 2 lower reversing portion 2d is wrapped.

The conventional curved escalator is constructed as described above, and when the drive device 11 is energized, the chain gear 11a rotates and the steps 3 are driven via the step chains 9a and 9b. And the step 3 is connected to each driving roller 5a, 5b.
are guided by the respective drive rails 6a and 6b, each of the following rollers 7a and 7b are guided by each of the follower rails 8a and 8b, and the side roller 10 is guided and rolled by the drive rail 6a, respectively, and is circulated in the conveyance path 2. . At this time, a component force in the direction of the center of the arc of the conveyance path 2 is generated on the step 3, but this load is supported by the side rollers 10 and the drive rail 6a that guides them.

Incidentally, escalators, whether curved or straight, have R-shaped cleats 3b formed on each of the treads 3a to improve strength and safety, as shown in Figure 5. In addition, the step shaft 4 is designed to be able to sufficiently withstand bending stress caused by passengers shifting to one side, etc. Therefore, the steps 3, which are provided with the step shaft 4 in the axial direction and are circulated on the conveyance path 2, have sufficient resistance against twisting caused by the passenger load.

[Problem that the invention seeks to solve]

As mentioned above, the conventional escalator has three steps.
Since the rollers 7 are circulated through the conveyance path 2 with sufficient resistance against twisting, each follower roller 7 is rotated during operation.
Even if either one of a or 7b is damaged or falls off,
There is no displacement in the posture of the step 3, and the conventional roller abnormality cannot be detected, and the escalator may continue to operate in the abnormal state. In such a case, the load on the remaining following roller on one side becomes excessive, and as a result, both following rollers are damaged, causing the step 3 to tilt significantly, resulting in an accident of the passenger falling down, injury to the floorboard, and the step 3 being damaged. There was a risk that equipment would be damaged due to collision with the floorboards.

In view of the above points, it is an object of the present invention to provide a safety device for an escalator that can prevent accidents by detecting breakage on either side of each follower roller.

[Means for solving problems]

The safety device for an escalator according to the present invention forms a bulge for forcibly displacing the step posture on the surface of one of the following rails at a location where no passenger load is applied, and also forms a bulge on the main frame side corresponding to the bulge. The roller is equipped with an abnormality detection means for monitoring the displacement that occurs when the following roller passes through the bulge and detects an abnormal defect in the following roller that has passed through the bulge due to non-occurrence of the displacement. be.

[Effect]

According to the present invention, by having the above configuration, the abnormality detecting means detects the relative position of the main frame side due to non-occurrence of displacement when the follower roller passes through the bulge in an abnormality, that is, when the expected displacement is not caused. This makes it possible to detect damage to the follow-up roller that has passed through the bulge, thereby preventing accidents.

〔Example〕

Hereinafter, the present invention will be described with reference to an embodiment shown in FIGS. 1 and 2, in which parts that are the same as those in the prior art are denoted by the same reference numerals. In the figure, 13 is a cam provided on the outer following rail 8a on the return side, and 14 is an abnormality installed near the other following rail 8b corresponding to this cam 13 and attached to the lower surface of the horizontal chord member 1a of the main frame 1. The detection mechanism includes a bracket 16 fixed to the lower surface of the horizontal chord member 1a via an L-shaped piece 15, and a proximal bending portion 18a pivotally attached to the bearing portion 16a of this bracket 16 via a pin 17. and an actuating lever 18 having a bent portion 18c at its free end that faces the shaft portion of the inner follower roller 7b corresponding to the cam displacement position of the outer follower roller 7a during normal operation with a slight gap C therebetween; 18, a spring mounting screw 19 that passes through each horizontal portion 18b, 16b of the bracket 16 from below and whose head abuts the horizontal lower surface of the operating lever 18, and a pair of rings 2 inserted into the protruding portion of this screw 19.
It is loaded between 0 and 20 mm and the repulsive force is adjusted by a nut 21, and the operating lever 18 is moved to the bracket 16.
The spring 22 that urges the spring 22 is screwed through the horizontal portion 18b of the actuating lever 18, and the tip thereof is connected to the bracket 16.
An adjusting screw 23 is attached to the outer surface of the upright end portion 16c of the bracket 16, and the adjusting screw 23 adjusts the relative positional displacement between the operating lever and the bracket, that is, the above-mentioned gap C by coming into contact with the lower surface of the horizontal portion 16b of the bracket 16. The switch 24 is pressed by the upper surface of the horizontal portion 18b of the operating lever 18. The gap C between the tip edge of the actuating lever 18 and the shaft of the inner follower roller 7b can be adjusted freely using the adjustment screw 23 as long as it is within the range of movement of the inner follower roller 7b that is assumed to occur in the event of an abnormality in the outer follower roller 7a. However, it is necessary to set it at a distance that does not affect normal operation. Since the configuration other than the above is the same as the conventional one, the explanation thereof will be omitted.

In the escalator safety device of the present invention configured as described above, when the outer follower roller 7a is in a normal state, when the drive device 11 is energized, the chain gear 11a rotates and the step chains 9a, 9b are rotated. The steps 3 are driven via the. In the step 3, each driving roller 5a, 5b is connected to each driving rail 6a, 6b, and each following roller 7a, 7b is connected to each following rail 8a, 8.
In addition, the side roller 10 is attached to the drive rail 6a.
They are each guided and moved, and are circulated through the conveyance path 2. At the cam 13 position, the step 3 is forcibly displaced about the step shaft 4 by the cam 13, and the upright portion 18c of the operating lever of the abnormality detection mechanism 14 and the shaft portion of the inner follower roller 16 A gap C is maintained between them, and the safety device does not operate.

However, if the outer follower roller 7a is damaged, the step 3 will not be displaced even at the cam 13 position, and the inner follower roller 7b will be guided and supported by the inner follower rail 8b and roll on this rail. , as a result, the inner follower roller 7b
At the cam 13 position, the shaft portion is displaced downward by an amount larger than the gap C. Then, the inner follower roller 7b whose position is biased is
The shaft portion engages with the actuating lever 18 and rotates the actuating lever 18 about the pin 17 against the biasing force of the spring 22. This rotation of the operating lever 18 simultaneously releases the operating portion 24a of the switch 24 from the biasing force of the spring 22, thereby detecting that an abnormality has occurred in the outer follower roller 7a. This may cause an external warning device to operate, or may cause the curved escalator to stop.

Incidentally, abnormality detection of the inner follower roller 7b is performed by installing a cam 13 on the inner follower rail 8b, contrary to FIG.
The abnormality detection mechanism 14 may be installed at a corresponding outer position.

Further, in the above embodiment, the switch 24 is operated via the operating lever 18, but it may be operated directly by, for example, the shaft of the inner follower roller 7b whose position is biased. , various modifications can be made within the technical idea of the present invention.

Furthermore, although the safety device of the present invention was used in a curved escalator in the above embodiment, it can of course be applied to a straight escalator, and the same effects as described above can be obtained.

〔Effect of the invention〕

As described above, in the present invention, a bulge portion for forcibly displacing the step posture is formed on the surface of either one of the following rails at a location where no passenger load is applied, and the main frame side corresponding to this bulge portion is formed. is provided with an abnormality detection means for monitoring the displacement that occurs when the following roller passes through the bulge and detects an abnormal defect in the following roller that has passed through the bulge due to non-occurrence of the displacement. This improves the problem that conventionally, even if one of the following rollers were damaged, the step did not collapse due to the rigidity of the step, making it impossible to detect an abnormality. The abnormality detection means that monitors this is capable of detecting the relative downward deviation of the main frame side due to non-occurrence of displacement when the follower roller passes through the bulge during an abnormality, that is, the expected displacement is not caused. As a result, damage to the follow-up roller that has passed through the bulge can be detected and accidents can be prevented.

[Brief explanation of drawings]

FIG. 1 is a longitudinal sectional view showing one embodiment of the present invention, FIG. 2 is a front view showing an enlarged main part of the present invention, and FIG.
The figure is a front view showing an outline of a conventional curved escalator, Figure 4 is a plan view showing the relationship between the steps and the step axis of the one in Figure 3, and Figure 5 is a plan view showing the treads of the one in Figure 3. . 3...Step, 7a...Outside follow-up roller, 7b...
...Inner follower roller, 8a...Outer follower rail, 8
b...Inner follower rail, 13...Cam (bulging part),
14... Abnormality detection mechanism. In addition, in the figures, the same reference numerals indicate the same or corresponding parts.

Claims (1)

[Scope of Claims] 1. Follow-up rollers each pivotally supported by pins fixed to both sides of the lower part of the step, and guide and support for each of the follow-up rollers arranged along the conveyance path of the step and fixed to the main frame, respectively. In an escalator equipped with a following rail, a bulge for forcibly displacing the step posture is formed on the surface of one of the following rails at a location where no passenger load is applied, and a main frame corresponding to the bulge is formed. An abnormality detection means is provided on the side for monitoring the displacement that occurs when the following roller passes through the bulge, and detects an abnormal defect in the following roller that has passed through the bulge due to non-occurrence of the displacement. escalator safety device. 2. The abnormality detection means includes an actuation lever that is pivotally mounted on the main frame side and engages the other follower roller shaft at a position slightly below the displacement position of the other follower roller shaft assumed by the above displacement; 2. The escalator safety device according to claim 1, further comprising a switch operated by rotation of a lever.