JP2010168149A - Man conveyor step chain tension adjusting system - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To automatically adjust a biasing force of a tension adjustment spring constantly to be suitable according to an elongation of a step chain and to greatly reduce required frequency of a check of a condition of the tension adjustment spring and of an adjusting work of a spring biasing force by a regular maintenance defect detection. <P>SOLUTION: A man conveyor step chain tension adjusting system includes the step chain wound in an endless state between a pair of step chain sprockets of which one is movably provided and the tension adjustment spring for biasing the one of the sprockets in a direction to increase a distance between the pair of the sprockets. The system is provided with a spring compression adjusting means for automatically adjusting a compression of the tension adjustment spring to be within a predetermined range according to a movement amount of the one of the sprockets in the direction to increase the distance between the sprockets. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a man conveyor step chain tension adjusting device.

In a general escalator which is a kind of man conveyor, upper and lower step chain sprockets are provided near both upper and lower ends in the escalator truss, and endless step chains are wound around these upper and lower step chain sprockets. Yes. A plurality of steps are connected to the step chain, and these steps are guided by the step chain and circulate in the escalator truss.
In conventional general escalators constructed in this way, it is possible to prevent slack in the step chain, or to absorb the elongation caused by the load change to the step and the elongation due to aging due to running of the escalator For this purpose, one sprocket, for example, the lower step chain sprocket can be moved, and the tension is urged by a spring in the direction in which the distance between the upper and lower step chain sprockets increases, that is, the end of the escalator truss. An adjustment device is provided.
When the step chain stretches, the lower step chain sprocket moves toward the end of the escalator truss by the action of the tension adjusting device.

  In the conventional man conveyor step chain tension adjusting device, even when the step chain is extended and the lower step chain sprocket moves toward the end of the escalator truss by the action of the tension adjusting device, the impact noise of the step roller on the guide rail When the step is reversed near the end in the escalator truss, the step chain is moved downward when the step roller away from the guide rail that guides the step roller contacts the guide rail again. Even if the step roller is lifted by the chain guide device that pushes upward from the top and the lower step chain sprocket moves and the contact surface position of the step roller changes, the step roller can smoothly contact the guide rail without colliding with the noise. Departure Those configured to enable prevented is known (e.g., see Patent Document 1).

  In addition, when the chain is greatly extended due to long-term use, etc., the lower step chain sprocket is greatly moved toward the end of the escalator truss to prevent interference between the step and the installed equipment. In order to prevent this, the tension rod is provided with a double nut for restricting the range of movement of the lower step chain sprocket (see, for example, Patent Document 2), There is also known a switch provided with a limit switch fixed in the vicinity of the upper side and a switch operating push plate that comes into contact with the operating lever of the limit switch in the middle of the tension rod (for example, see Patent Document 3).

JP 2002-046967 A Japanese Utility Model Publication No. 57-074366 Japanese Utility Model Publication No. 58-023872

In such a conventional man conveyor step chain tension adjustment device, the tension of the tension adjustment spring is adjusted by tightening the nut of the tension rod at the time of maintenance and inspection for the extension of the step chain. The tension was adjusted.
And in any of the conventional man conveyor step chain tension adjusting devices shown in the above patent documents, if the extension of the step chain is larger than expected, the extension of the tension adjusting spring becomes larger until the regular maintenance inspection. Since the urging force is reduced and the force to hold the shaft of the lower step chain sprocket in the same position is weakened, it becomes easier to move, so there is a problem that the step tends to be displaced forward and backward in the moving direction and becomes unstable. .
In addition, periodically or whenever there is a detection by a limit switch, etc., a maintenance check must be performed to check the length of the tension adjusting device spring, and the spring biasing force must be adjusted to an appropriate value. There is also a problem that the work is troublesome.

  The present invention has been made to solve the above-described problems, and it is possible to automatically adjust the urging force of the tension adjustment spring to an appropriate one at all times according to the elongation of the step chain. Thus, it is possible to obtain a man conveyor step chain tension adjusting device capable of greatly reducing the necessary frequency of the tension adjustment spring state confirmation and the spring biasing force adjustment work by periodic maintenance and inspection.

  In the man conveyor step chain tension adjusting device according to the present invention, a step chain wound endlessly between a pair of step chain sprockets, one of which is movable, and one of the steps provided to be movable A tension adjusting spring for urging the chain sprocket in a direction to increase the distance between the pair of step chain sprockets, and a man conveyor step chain tension adjusting device, wherein the one step provided movably Spring compression amount adjusting means for automatically adjusting the compression amount of the tension adjustment spring to be within a predetermined range according to the amount of movement of the chain sprocket in the direction of increasing the distance between the pair of step chain sprockets It is set as the structure provided with these.

  The present invention relates to a man conveyor step chain tension adjusting device, a step chain wound endlessly between a pair of step chain sprockets, one of which is movably provided, and one of the step chain sprockets movably provided And a tension adjusting spring that biases the pair of step chain sprockets in the direction of increasing the distance between the pair of step chain sprockets, the man conveyor step chain tension adjusting device having one of the movably provided step chain sprockets A spring compression amount adjusting means for automatically adjusting the compression amount of the tension adjustment spring to be within a predetermined range in accordance with the amount of movement in the direction of increasing the distance between the pair of step chain sprockets; By having a configuration with It is possible to automatically adjust the urging force of the tension adjustment spring to an appropriate one at any time according to the elongation of the tension. Check the state of the tension adjustment spring and adjust the spring urging force by regular maintenance and inspection. There is an effect that the required frequency can be greatly reduced.

  The present invention will be described with reference to the accompanying drawings. Throughout the drawings, the same reference numerals indicate the same or corresponding parts, and redundant description thereof will be simplified or omitted as appropriate.

Embodiment 1 FIG.
1 to 3 relate to Embodiment 1 of the present invention. FIG. 1 is a perspective view of a man conveyor step chain tension adjusting device, FIG. 2 is a side view of the man conveyor step chain tension adjusting device, and FIG. It is a front view of a conveyor step chain tension adjusting device. In these drawings, some steps are not shown for easy viewing.
Here, an escalator will be described as a man conveyor.
In the figure, reference numeral 1 denotes an escalator truss that is a basic framework of an escalator. An upper step chain sprocket and a lower step chain sprocket 2 (not shown) are provided on the escalator truss 1 near both the upper and lower ends, respectively, and a pair of left and right upper step chain sprockets are provided between the upper step chain sprocket and the lower step chain sprocket 2. The pair of step chains 3 is wound endlessly. A plurality of steps 4 are connected between the pair of step chains 3, and these steps 4 are guided by the step chain 3, and are turned upside down in the upper step chain sprocket and the lower step chain sprocket 2. While circulating in the escalator truss 1.
Each step 4 is provided with a step roller 4 a that rolls on a rail (not shown), and an oil pan 5 is installed over almost the entire bottom of the escalator truss 1.

The pair of lower step chain sprockets 2 are fixed to both ends of the chain sprocket shaft 6, and the chain sprocket shaft 6 is rotatably supported by a pair of slide bearings 7 at both ends.
Below these slide bearings 7, bearing rollers 7 a are provided. The bearing rollers 7 a are guided while rolling on a pair of bearing guides 8. The truss 1 is supported so as to be movable in the longitudinal direction. Therefore, the lower step chain sprocket 2 is rotatable and movable in the longitudinal direction of the escalator truss 1.

On the lower frame of the escalator truss 1 made of L-shaped steel and at a position near the lower end of the escalator truss 1 of the lower step chain sprocket 2, a rod support having a substantially L-shaped cross section through a base plate 9a. A frame 9 is erected substantially vertically, and a tension rod 10 is connected to the slide bearing 7 toward the lower end side of the escalator truss 1.
The tension rod 10 passes through the hole drilled in the rod support frame 9 and the tension adjustment spring 11 is passed through the tension rod 10. One spring receiver 12 is provided by passing the tension rod 10 through a first rod hole 12a formed in a substantially central portion thereof. Further, a second spring support 13 is passed through the tension adjusting spring 11 on the side opposite to the lower step chain sprocket 2, and the tension rod 10 is passed through a second rod hole 13 a drilled at a substantially central portion thereof. Is provided.
A thread is threaded on the end of the tension rod 10 opposite to the lower step chain sprocket 2, and the tension adjusting nut 14 that is screwed into the thread is opposite to the second spring receiver 13. It is provided adjacent to the lower step chain sprocket 2 side.
The tension adjusting spring 11 is compressed between the first spring receiver 12 and the second spring receiver 13, and the lower step chain sprocket 2 moves the tension rod 10 toward the lower end side of the escalator truss 1. It is energizing in the direction of movement. Adjustment of the urging force (ie, tension) is performed by adjusting the distance between the first spring receiver 12 and the second spring receiver 13 by turning the tension adjusting nut 14 to change the screwing position. Then, it is performed by adjusting the compression amount of the tension adjusting spring 11.
Further, a split pin 15 is attached to the end of the tension rod 10 opposite to the end portion on the lower step chain sprocket 2 side to restrict the screwing position of the tension adjusting nut 14.

A lower end portion of a movable arm 17 is swingably attached to the lower frame of the escalator truss 1 by the first pin 16, and the movable arm 17 is opposed to the lower frame side (that is, the upper side). In the longitudinal direction, a long hole 17a is formed.
A movable arm sliding pin 7b provided outside the side surface of the slide bearing 7 is slidably engaged in the long hole 17a, and the longitudinal length of the escalator truss 1 of the lower step chain sprocket 2 is engaged. Movement in the direction is converted into swinging of the movable arm 17.
One end portion of a first rod 19 is rotatably attached to a middle portion in the longitudinal direction of the movable arm 17 by a second pin 18. The other end portion of the first rod 19 is notched upward to form a slope portion 19b, and a lower portion is provided with a first roller 19a. The first roller 19a is The first rod 19 is guided by the rod receiving guide 20 by rolling on a rod receiving guide 20 having a substantially U-shaped cross section attached to the middle portion of the rod support frame 9 substantially horizontally. It is supported so as to be movable in a substantially horizontal direction.
With this configuration, the swing of the movable arm 17 is transmitted as a horizontal movement of the first rod 19.

On the upper side of the rod support frame 9 when viewed from the first rod 19 and the rod receiving guide 20, a second rod 22 is arranged in the longitudinal direction by a rod guide 21 attached to the rod support frame 9. Are arranged vertically and supported so as to be slidable in the vertical direction.
A second roller 22 a is rotatably provided at the lower end portion of the second rod 22, and the second roller 22 a rolls on the slope portion 19 b of the first rod 19. It touches so as to.
The second rod 22 is urged in the direction of moving downward by the action of a return spring 23 inserted between the rod guide 21 and the second roller 22a. The second roller 22a is moderately pressed to the inclined surface portion 19b, and slippage is unlikely to occur between the inclined surface portion 19b and the second roller 22a. At the same time, the second roller 22a pushed by the inclined surface portion 19b is guided by the contact plate 20a provided in the rod receiving guide 20 so as to appropriately move in the vertical direction.
A first ratchet tooth 22 b is provided along the longitudinal direction of the upper side of the second rod 22.

The tension rod 10 is passed through a hollow screw rod 24 which is hollow by being drilled with a third rod hole 24a and threaded on the outer periphery thereof. Are arranged adjacent to the lower step chain sprocket 2 side through a washer.
And the ratchet nut 25 which has the 2nd ratchet tooth | gear 25a on the outer periphery is screwed by the said thread of this hollow screw rod 24. As shown in FIG.
The diameter of the hole formed in the rod support frame 9 and through which the tension rod 10 passes is larger than the outer diameter of the hollow screw rod 24 and smaller than the outer diameter of the ratchet nut 25. It has become. Therefore, the hollow threaded rod 24 can freely pass through the hole, while the ratchet nut 25 comes into contact with the rod support frame 9, and the hollow position of the hollow screw rod 24 depends on the screwing position of the ratchet nut 25. The position of the screw rod 24 relative to the rod support frame 9 is determined.
A washer 25 b is inserted between the ratchet nut 25 and the rod support frame 9 in order to prevent the ratchet nut 25 and the rod support frame 9 from coming into direct contact.

When the ratchet nut 25 is rotated and the hollow screw rod 24 is moved to the lower step chain sprocket 2 side with respect to the rod support frame 9, it is pushed by the hollow screw rod 24 and the first screw chain 24 is pushed. The position of the spring receiver 12 also moves to the lower step chain sprocket 2 side.
Accordingly, the distance between the first spring receiver 12 and the second spring receiver 13 is narrowed, and the tension adjusting spring 11 is compressed, so that the urging force can be increased.

A return prevention claw 26 is rotatably attached to the rod support frame 9 at a position above the ratchet nut 25 by a third pin 26a. The return prevention pawl 26 is pressed against the second ratchet teeth 25a of the ratchet nut 25 by a helical spring 26b, and the hollow screw rod 24 of the ratchet nut 25 is anti-lower step chain sprocket 2 While allowing free rotation in the direction of movement to the side, rotation in the opposite direction is prohibited.
Further, the first ratchet teeth 22b of the second rod 22 mesh with the second ratchet teeth 25a of the ratchet nut 25, and when the second rod 22 moves upward, The ratchet nut 25 rotates in a direction to move the hollow screw rod 24 to the lower step chain sprocket 2 side.

The upper portion of the second rod 22, that is, the portion on which the first ratchet teeth 22b are provided, on the side opposite to the first ratchet teeth 22b, is rotated by a pin and pin support 28a on the rod support frame 9. A freely attached presser plate 27 is in contact with the presser plate 27, and the second rod 22 is pressed toward the ratchet nut 25 by a press spring 28b. In this way, the engagement of the first ratchet teeth 22b and the second ratchet teeth 25a is prevented from coming off.
The pressing spring 28b is disposed in a recessed portion formed by placing the first metal fitting 28c from the back side of the hole formed in the rod support frame 9, and falls or the like. There is no such thing.

A rectangular rod support portion 13b is formed in the lower portion of the second spring support 13, and the rectangular rod support portion 13b is parallel to the tension rod 10 toward the first spring support 12 side. A square rod 13c is provided. The rectangular rod 13c is passed through the angular guide hole 12b formed in the lower part of the first spring receiver 12.
Further, a second metal fitting 12c is attached to the lower part of the portion of the first spring receiver 12 where the angular guide hole 12b is provided, and the second metal fitting 12c has a fourth fitting. One end of the link 29 is rotatably attached by a pin 29a.
A long hole is formed in the other end of the link 29, and a third fitting attached to the rod guide 21 by a fifth pin 29b slidably engaged in the long hole. 21a.
The square rod 13 c and the link 29 prevent the first spring receiver 12 and the second spring receiver 13 from rotating carelessly with respect to the tension rod 10.

Here, the movable arm 17, the first rod 19, and the second rod 22 constitute movement transmission means for mechanically transmitting movement of the lower step chain sprocket 2, and The spring receiver 12, the second spring receiver 13, the hollow screw rod 24, and the ratchet nut 25 are mechanically moved by the movement of the lower step chain sprocket 2 transmitted by the movement transmitting means, and the tension adjusting spring 11 is mechanically moved. The spring compression means for compressing is configured.
The movement transmission means and the spring compression means include spring compression amount adjustment means for automatically adjusting the compression amount of the tension adjustment spring 11 to an appropriate one according to the movement amount of the lower step chain sprocket 2. It is composed.
Although the above has mainly described one side of the pair of lower step chain sprockets 2, the other side is configured in the same manner.

In the man conveyor step chain tension adjusting device configured as described above, the tension adjusting spring 11 is compressed by adjusting the position of the first spring receiver 12 by the tension adjusting nut 14 as described above. The amount is adjusted, and the tension applied to the step chain 3 is adjusted.
When the step chain 3 is stretched by using the escalator, the lower step chain sprocket 2 is moved to the lower end side of the escalator truss 1 by the action of the tension adjusting spring 11, and the tension of the step chain 3 is increased. Is maintained.

At this time, the movement of the lower step chain sprocket 2 toward the lower end side of the escalator truss 1 is converted into the swing of the movable arm 17, and further, the first rod 19 moves toward the lower end side of the escalator truss 1. Reported as a move.
And if the said 1st rod 19 moves to the said escalator truss 1 lower end side, the said 2nd rod 22 will be pushed up via the said slope part 19b and the said 2nd roller 22a.
When the second rod 22 is pushed upward, the ratchet nut 25 causes the hollow screw rod 24 to be moved by the action of the first ratchet teeth 22b and the second ratchet teeth 25a meshing with the first ratchet teeth 22b. The rod support frame 9 is tightened in the direction of moving to the lower step chain sprocket 2 side.
Therefore, when the hollow screw rod 24 moves to the lower step chain sprocket 2 side and pushes the first spring receiver 12 toward the second spring receiver 13, the tension adjusting spring 11 is moved. Compressed.

  In this way, when the step chain 3 is stretched and the lower step chain sprocket 2 moves to the lower end side of the escalator truss 1 by the action of the tension adjusting spring 11, if the state remains unchanged, When the distance between the first spring receiver 12 and the second spring receiver 13 increases and the amount of compression of the tension adjustment spring 11 decreases, the movement of the lower step chain sprocket 2 is changed to the movable arm 17, The ratchet nut 25 is tightened by transmitting with the first rod 19 and the second rod 22, and the first spring receiver 12 is moved toward the second spring receiver 13 by the hollow screw rod 24. By pushing, the tension adjustment spring 11 is compressed, and the amount of compression of the tension adjustment spring 11 is maintained within a predetermined range. That is, to maintain the tension applied to the step 4 is always appropriate state.

In addition, as the user gets on the step 4, the load acting on the step chain 3 always varies, and accordingly, the position of the chain sprocket shaft 6 also slightly varies.
If the ratchet nut 25 is tightened due to the relatively small position fluctuation of the chain sprocket shaft 6 that is constantly generated, the ratchet nut 25 once tightened by the ratchet action does not return. However, an inconvenient situation may occur.
Therefore, by connecting the first rod 19 at the intermediate portion in the longitudinal direction of the movable arm 17, the displacement amount of the first rod 19 is greater than the displacement amount of the chain sprocket shaft 6 due to the lever principle. By adjusting the interval between the first ratchet teeth 22b and the second ratchet teeth 25a, the chain sprocket shaft 6 may be generated by a relatively small position change of the chain sprocket shaft 6 by adjusting the distance between the first ratchet teeth 22b and the second ratchet teeth 25a. The ratchet nut 25 is not tightened, and the ratchet nut 25 is tightened when the position of the chain sprocket shaft 6 is larger than a predetermined position.
Further, by connecting the first rod 19 at the intermediate portion in the longitudinal direction of the movable arm 17, the force transmitted from the first rod 19 to the second rod 22 is increased by the lever principle. There is also an effect of becoming.

In the man conveyor step chain tension adjusting device configured as described above, the tension is determined according to the amount of movement in the direction of increasing the distance between the upper and lower step chain sprockets of the lower step chain sprocket that is movably provided. By providing spring compression amount adjusting means that automatically adjusts the compression amount of the adjustment spring so that it falls within the specified range, the urging force of the tension adjustment spring is always appropriate according to the extension of the step chain. It is possible to automatically adjust, and the frequency required for the tension adjustment spring state check and spring biasing force adjustment work by periodic maintenance and inspection can be greatly reduced.
For this reason, it is possible to extend the life of the step chain.

  Further, the spring compression amount adjusting means mechanically compresses the tension adjusting spring by the movement transmitting means for mechanically transmitting the movement of the lower step chain sprocket and the movement of the lower step chain sprocket transmitted by the movement transmitting means. And a spring compressing means that comprises a movable arm whose one end is engaged with the lower step chain sprocket and whose other end is pivotally supported. The rod is pivotally attached to the middle portion in the longitudinal direction, so that the rod displacement amount is smaller than the displacement amount of the lower step chain sprocket by the lever principle, and this rod It is possible to increase the force transmitted by the lower step chain sprocket, which is always generated. Moving the can compression amount adjustment of the tension adjustment spring by spring compression amount adjustment means is prevented from operating.

  In this embodiment, as a specific engagement method between the lower step chain sprocket and the movable arm, the movable arm sliding pin provided on the slide bearing that rotatably supports the shaft of the lower step chain sprocket. A method of slidably engaging in a long hole provided on one end side of the movable arm was adopted.

Embodiment 2. FIG.
4 and 5 relate to Embodiment 2 of the present invention. FIG. 4 is an exploded perspective view of the man conveyor step chain tension adjusting device, and FIG. 5 is an enlarged side view of the main part of the man conveyor step chain tension adjusting device. is there.
In the first embodiment described above, the ratchet nut can be tightened indefinitely as long as it is within the range of the thread of the hollow screw rod, and once tightened, the ratchet acts to return to the original screwing position. Since there is no return, for example, if there is a large load fluctuation in the step chain due to some factor, the position of the chain sprocket shaft may fluctuate greatly and the ratchet nut may be tightened too much.
Therefore, in the second embodiment described here, in addition to the configuration of the first embodiment described above, when the compression amount of the tension adjusting spring becomes larger than a predetermined value, the ratchet nut rotates relative to the hollow screw rod. Thus, a means (spring compression amount regulating means) for preventing the ratchet nut from being tightened any more is provided.

That is, a toothed washer 30 is inserted between the first spring receiver 12 and the hollow screw rod 24. On the outer periphery of the toothed washer 30, irregularities are alternately provided to form a toothed mold 30 a, and a square hole 30 b having a substantially square shape is formed in the substantially central part of the toothed washer 30. Has been.
An angular protrusion 24b that engages with the square hole 30b is provided on the end face of the hollow screw rod 24 on the toothed washer 30 side, and the angular protrusion 24b engages with the square hole 30b. In this state, the hollow screw rod 24 and the toothed washer 30 rotate together.
A fourth metal fitting 13d is attached to the end of the square rod 13c protruding from the square rod support portion 13b of the second spring receiver 13 on the first spring receiver 12 side so as to face upward. It has been. The fourth metal fitting 13d is provided with a protruding bar 13e having a pointed tip that is loose and pointed toward the second spring support 13 side.
The protruding bar 13e passes between the teeth of the tooth mold 30a of the toothed washer 30 and the teeth, and penetrates into the protruding bar escape hole 12d formed in the first spring support 12 with play. Are arranged to be.
Other configurations are the same as those in the first embodiment.

In the man conveyor step chain tension adjusting device configured as described above, the amount of compression of the tension adjusting spring 11 is small, and the protruding bar 13e passes between the teeth of the tooth mold 30a and enters the protruding bar escape hole 12d. When the tooth mold 30a and the protruding bar 13e come into contact with each other, the toothed washer 30 cannot rotate with respect to the tension rod 10.
Accordingly, the hollow screw rod 24 engaged with the toothed washer 30 via the square hole 30b and the square protrusion 24b also does not rotate with respect to the tension rod 10, so that the second When the rod 22 moves upward, the ratchet nut 25 rotates with respect to the hollow screw rod 24 through the engagement of the first ratchet teeth 22b and the second ratchet teeth 25a.
Then, since the screwing position of the ratchet nut 25 in the hollow screw rod 24 moves, the hollow screw rod 24 moves to the lower step chain sprocket 2 side, and the first spring support 12 is moved to the first step. The tension adjusting spring 11 is compressed by pushing toward the second spring receiver 13 side.

On the other hand, the amount of compression of the tension adjustment spring 11 is increased, and the first spring receiver 12 and the toothed washer 30 move toward the second spring receiver 13 rather than the tip of the protruding bar 13e. Then, the protruding bar 13e does not pass between the teeth of the tooth mold 30a and the protruding bar escape hole 12d.
At this time, since the toothed washer 30 can freely rotate with respect to the tension rod 10, the hollow screw rod 24 can also rotate with respect to the tension rod 10. . Accordingly, when the second rod 22 moves upward, the ratchet nut 25 rotates with respect to the tension rod 10. At this time, due to the friction between the hollow screw rod 24 and the ratchet nut 25, The hollow screw rod 24 rotates with respect to the tension rod 10 together with the ratchet nut 25.
That is, since the ratchet nut 25 does not rotate with respect to the hollow screw rod 24, the screwing position of the ratchet nut 25 in the hollow screw rod 24 does not move, and the hollow screw rod 24 moves. Without this, the tension adjusting spring 11 is no longer compressed.

The compression amount of the tension adjusting spring 11 is increased once, and the first spring receiver 12 and the toothed washer 30 are moved to the second spring receiver 13 side from the tip of the protruding bar 13e. After the movement and the tension adjustment spring 11 is not compressed any more, the step chain 3 is extended, and the amount of compression of the tension adjustment spring 11 is reduced. It passes between the teeth of the mold 30a and the protruding rod escape hole 12d, and the screw feeding action of the hollow screw rod 24 by the rotation of the ratchet nut 25 is resumed.
In this way, once the tension adjusting spring 11 is compressed by a predetermined compression amount determined by the length of the protruding rod 13e, the tension adjustment by the hollow screw rod 24 even once the ratchet nut 25 rotates. Although the compression operation of the spring 11 is not performed, when the compression amount of the tension adjusting spring 11 becomes smaller than the predetermined compression amount, the protruding bar 13e again restrains the rotation of the toothed washer 30 and The screw feeding action of the hollow screw rod 24 by the rotation of the ratchet nut 25 is resumed.

  In the man conveyor step chain tension adjusting device configured as described above, the same effect as in the first embodiment can be obtained, and the compression amount of the tension adjustment spring exceeds a predetermined compression amount. The spring compression amount restricting means is prevented so that the chain sprocket shaft position is greatly varied and the ratchet nut is tightened too much when there is a large load fluctuation on the step chain due to some reason. Such a situation can be prevented in advance.

And in this embodiment, as a specific configuration of the spring compression amount regulating means, the end of the hollow screw rod on the first spring receiving side is provided to rotate integrally with the hollow screw rod, A washer with a tooth mold in which a tooth pattern is formed by alternately providing irregularities on its outer periphery, a square rod provided from the second spring receiver toward the first spring receiver, and a first of the square rod A protrusion bar projecting toward the second spring support, and when the compression amount of the tension adjustment spring is equal to or less than a predetermined compression amount, the protrusion bar is The ratchet nut is placed against the hollow threaded rod by controlling the rotation of the toothed washer and the hollow threaded rod by placing the projecting rod in contact with the toothed mold. Rotation and hollow screw rod can be moved by screw feeding action, tension adjustment If the compression amount of the screw exceeds the predetermined compression amount, the protruding bar is not disposed between the teeth of the washer with the tooth mold, the contact of the protruding bar with the tooth mold is released, and the ratchet nut is a hollow screw. The structure is such that the compression amount of the tension adjustment spring is prevented from exceeding the predetermined compression amount by restricting the movement of the hollow screw rod without rotating the screw and exerting the screw feeding action. It was.
A slit may be provided instead of the tooth mold of the washer 30 with the tooth mold.

It is a perspective view of the man conveyor step chain tension adjusting device in Embodiment 1 of this invention. It is a side view of the man conveyor step chain tension adjusting device in Embodiment 1 of this invention. It is a front view of the man conveyor step chain tension adjusting device in Embodiment 1 of this invention. It is a disassembled perspective view of the man conveyor step chain tension adjusting device in Embodiment 2 of this invention. It is a principal part enlarged side view of the man conveyor step chain tension adjusting device in Embodiment 2 of this invention.

DESCRIPTION OF SYMBOLS 1 Escalator truss 2 Lower step chain sprocket 3 Step chain 4 Step 4a Step roller 5 Oil pan 6 Chain sprocket shaft 7 Slide bearing 7a Roller for bearing 7b Sliding pin for movable arm 8 Bearing guide 9 Rod support frame 9a Base plate 10 Tension rod DESCRIPTION OF SYMBOLS 11 Tension adjustment spring 12 1st spring support 12a 1st rod hole 12b Square guide hole 12c 2nd metal fitting 12d Protrusion stick escape hole 13 2nd spring support 13a 2nd rod hole 13b Square rod support part 13c Square rod 13d Fourth metal fitting 13e Protrusion bar 14 Tension adjusting nut 15 Split pin 16 First pin 17 Movable arm 17a Long hole 18 Second pin 19 First rod 19a First roller 19b Slope portion 20 Rod receiving guide 20a Batting plate DESCRIPTION OF SYMBOLS 1 Rod guide 21a 3rd metal fitting 22 2nd rod 22a 2nd roller 22b 1st ratchet tooth 23 Return spring 24 Hollow screw rod 24a 3rd rod hole 24b Square protrusion 25 Ratchet nut 25a 2nd ratchet tooth 25b Washer 26 Return-preventing claw 26a Third pin 26b Helical spring 27 Presser plate 28a Pin holder 28b Press spring 28c First metal fitting 29 Link 29a Fourth pin 29b Fifth pin 30 Toothed washer 30a Tooth type 30b Square Hole

Claims (8)

A step chain wound endlessly between a pair of step chain sprockets, one of which is movably provided;
A man conveyor step chain tension adjustment device comprising a tension adjustment spring that urges one of the step chain sprockets movably provided in a direction to increase the distance between the pair of step chain sprockets,
The amount of compression of the tension adjustment spring is within a predetermined range in accordance with the amount of movement of the one step chain sprocket that is movably provided in the direction of increasing the distance between the pair of step chain sprockets. A man conveyor step chain tension adjusting device, comprising: a spring compression amount adjusting means for automatically adjusting. The spring compression amount adjusting means includes:
A movement transmitting means for mechanically transmitting the movement of one of the step chain sprockets movably provided;
2. A spring compressing means for mechanically compressing the tension adjusting spring by the movement of one of the movably provided step chain sprockets transmitted by the movement transmitting means. The described man conveyor step chain tension adjusting device. The movement transmitting means includes a movable arm whose one end is engaged with one of the movably provided step chain sprockets and the other end is pivotally supported.
The man conveyor step chain tension adjusting device according to claim 2, further comprising: a rod having one end rotatably attached to a longitudinal intermediate portion of the movable arm.   A movable arm slide pin provided on a slide bearing that rotatably supports the shaft of one of the step chain sprockets provided in a movable manner is in a long hole provided on the one end side of the movable arm. 4. The man conveyor step chain tension adjustment according to claim 3, wherein the movable arm is engaged with one of the movably provided step chain sprockets by being slidably engaged. apparatus. The spring compression means includes
A pair of spring supports provided in contact with both ends of the tension adjustment spring;
A screw rod that pushes one of the pair of spring supports toward the other of the spring supports;
A nut screwed onto the screw rod,
The nut is rotated by the movement of one of the movably provided step chain sprockets transmitted by the movement transmitting means, and the screw rod is moved by a screw feeding action, so that one of the pair of spring receivers is moved to the other. The man conveyor step chain tension adjusting device according to any one of claims 2 to 4, wherein the tension adjusting spring is compressed by being pushed toward the spring receiver.   The man conveyor step chain according to claim 5, wherein the nut is a ratchet nut having ratchet teeth provided on an outer periphery thereof, and is only allowed to rotate in a direction in which the tension adjustment spring is compressed. Tension adjustment device.   The man conveyor step chain tension according to any one of claims 1 to 4, further comprising spring compression amount regulating means for preventing a compression amount of the tension adjusting spring from exceeding a predetermined compression amount. Adjustment device. A toothed washer provided at the end of the one spring receiving side of the threaded rod so as to rotate integrally with the threaded rod, and provided with irregularities on the outer periphery alternately to form a tooth pattern; ,
A square rod provided from the other spring support toward the one spring support;
A protrusion rod projecting toward the other spring support at the end of the one of the square rods on the spring reception side;
When the compression amount of the tension adjusting spring is equal to or less than a predetermined compression amount, the protrusion bar is disposed between teeth of the toothed washer, and the protrusion bar contacts the tooth mold. By restricting the rotation of the toothed washer and the screw rod, the nut rotates with respect to the screw rod, and the screw rod can be moved by a screw feed action.
When the compression amount of the tension adjustment spring exceeds the predetermined compression amount, the protrusion bar is not disposed between the teeth of the washer with the tooth mold, and the protrusion bar contacts the tooth mold. The nut is rotated integrally with the screw rod and the movement of the screw rod is restricted without exhibiting the screw feeding action, so that the compression amount of the tension adjusting spring exceeds a predetermined compression amount. The man conveyor step chain tension adjusting device according to claim 5, further comprising a spring compression amount regulating means for preventing this.

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