JPH0977449A - Safety device for man conveyor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a safety device capable of surely keeping a man conveyor inoperative during its maintenance inspection work. SOLUTION: When a bolt 9 is removed from a screw hole 8 a in order to remove a boarding/alighting plate 3a for sealing the machine chamber of a man conveyor from a machine frame 8, a slide pin 46 pressed by a spring 44 is displaced upward in the screw hole 8a. Thus, since the tip of a rocking arm 43 is displaced upward so as to prevent the operation button 45a of a limiter switch 45 from being pressed down, the limiter switch 45 is placed in an OFF state and thereby the running of the man conveyor is made impossible. When the bolt 9 is fitted in the screw hole 8a and fixed in order to fix the boarding/ alighting plate 3a to the machine frame 8, since the slide pin 46 is displaced downward and the rocking arm 43 is pressed down, the limiter switch 45 is placed in an ON state and the man conveyor becomes operative.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a man conveyor such as an escalator or a moving walkway, and more particularly to a safety device which disables the man conveyor when performing maintenance work on these man conveyors.

[0002]

2. Description of the Related Art Although man conveyors such as escalators and moving walkways are widely used, devices for driving steps and handrails of these man conveyors are as shown in FIG. It is housed in a machine room 4 which is closed by a boarding plate 3 attached to the boarding port 2. Then, when performing maintenance and inspection work on the man conveyor 1, the worker removes the boarding / alighting plate 3 and enters the machine room 4 to inspect equipment such as the motor 5, the drive chain 6 and the control device 7. Has been done.

By the way, it is dangerous if the man conveyor 1 is suddenly operated while an operator is performing an inspection work in the machine room 4. Therefore, as shown in FIG. 6, a safety device 10 that disables the operation of the passenger conveyor 1 when the boarding / alighting plate 3 is removed is provided in the machine room 4. This safety device 1
The 0 has an L-shaped bracket 11 attached to the machine frame 8 of the passenger conveyor 1, as shown in FIG. 7.
A swing arm 13 is swingably supported on the horizontal shaft 12 attached to the bracket 11. The swing arm 13 is biased by a spring 14 so that one end 13 a thereof projects upward from the machine frame 8. When the swing arm 13 swings by a predetermined angle or more, the other end portion 13b of the swing arm 13 presses the limit switch 15 to turn it off.

With the boarding / alighting plate 3 fixed to the machine frame 8,
The tip portion 13a of the swing arm 13 is pressed by the boarding / alighting plate 3, and the swing arm 13 cannot swing more than a predetermined angle. As a result, the limit switch 15 is turned on, and the passenger conveyor 1 is brought into an operable state.
On the other hand, when an operator removes the boarding / alighting board 3 from the machine frame 8 to perform maintenance / inspection work on the passenger conveyor 1, the swing arm 13 that is no longer pressed down by the boarding / alighting board 3 is urged by a spring 14 to a predetermined position. Swing more than the angle. Then, the limit switch 15 is turned off, and the passenger conveyor 1 cannot be operated.

[0005]

However, in the above-described safety device 10, the worker swings by accidentally placing the boarding / alighting plate 3 on the bracket 11 or placing a tool or the like used for the work. When the tip portion 13a of the arm 13 is pressed, the swing angle of the swing arm 13 decreases. As a result, the limit switch 15 may be turned on, and the passenger conveyor 1 may be operable. That is, the conventional passenger conveyor safety device 10 is
There is a problem that the man conveyer 1 cannot be surely disabled while the worker is performing maintenance work on the man conveyer 1.

Therefore, an object of the present invention is to solve the problems of the prior art and to provide a safety device which can surely disable the man-conveyor during maintenance and inspection work of the man-conveyor. To provide.

[0007]

In the safety device for a man conveyor according to the present invention, a bolt for fixing a board for getting on and off a machine room of the man conveyor to a machine frame of the man conveyor is a screw formed on the machine frame. An interlocking member that is displaced in association with the displacement of the bolt when being attached to and detached from the hole, and a control switch that is turned on and off according to the displacement of the interlocking member are provided. The control switch enables the man conveyor when the bolt is attached to the machine frame,
Further, the man conveyer is controlled so as to make the man conveyer inoperable when the bolt is removed from the machine casing. As a result, when the boarding / alighting plate is removed from the machine frame in order to perform maintenance / inspection work on the passenger conveyor, the control switch is turned off and the passenger conveyor becomes inoperable.
Then, when maintenance and inspection work is completed and the bolts that secure the boarding / alighting plate to the machine frame are screwed into the machine frame, the control switch is turned on and the man conveyor can be operated.

[0008]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of a safety device for passenger conveyor according to the present invention will be described in detail below with reference to FIGS.

First Embodiment First, a man conveyer to which the safety device for a man conveyer according to the first embodiment is applied will be explained. The passenger board 3a is installed at the upper floor entrance 2a of the man conveyor 1 shown in FIG. But,
The boarding / alighting board 3b is attached to the machine frame 8 at the entrance / exit 2b on the lower floor side. And these boarding / alighting board 3
An upper machine room 4a and a lower machine room 4b are provided below a and 3b, respectively. When performing the maintenance and inspection work of the passenger conveyor 1, the worker is
Remove a and 3b to enter the machine room 4a and 4b,
Devices such as the motor 5, the drive chain 6 and the control device 7 are inspected.

Next, the safety device 40 of the first embodiment will be described. The safety device 40 of the first embodiment is attached to the machine frame 8 of the man conveyor 1 in the upper machine room 4a and the lower machine room 4b, respectively. In addition,
Since the pair of safety devices 40 respectively installed in the upper machine room 4a and the lower machine room 4b have exactly the same structure, the safety device 40 installed in the upper machine room 4a will be described.

As shown in FIG. 2, the boarding / alighting plate 3a is attached to the machine frame 8
The bolt 9 that is fixed to the screw is a screw hole 8a formed in the machine frame 8.
It is screwed to. Then, the safety device 4 of the first embodiment
0 is attached to the lower surface 8b of the machine frame 8 so as to face the screw hole 8a. The safety device 40 has a bracket 41 fixed to the lower surface 8b of the machine frame 8 and manufactured by bending a metal plate into a U-shape. A swing shaft 42 extending horizontally is attached to one vertical wall 41 a of the bracket 41. A base end of a swing arm 43 that extends substantially parallel to the lower surface 8b of the machine frame 8 is fixed to the swing shaft 42. In addition, the swing arm 43 and the bracket 41
A spring 44 is interposed between the horizontal wall 41b and the horizontal wall 41b, and the swing arm 43 is biased toward the screw hole 8a.
The tip of the swing arm 43 is in contact with the top of the operation button 45a of the limit switch 45 attached to the bracket 41. On the other hand, in the longitudinal direction of the swing arm 43, a base end of a cylindrical slide pin 46 slidable in the screw hole 8a is pivotally supported by a support shaft 47. Thereby, the slide pin 4
6 is urged upward of the screw hole 8a, and its tip is in contact with the lower end of the bolt 9. In this state, the swing arm 43 extends substantially horizontally, and its tip pushes down the operation button 45a of the limit switch 45. As a result, the limit switch 45 is in the on state.

The limit switches 45 of the pair of safety devices 40 mounted in the upper machine room 4a and the lower machine room 4b are the same as those in the control circuit 50 shown in FIG.
They are connected in series with each other. As a result, when at least one of the limit switches 45 is turned off, the relay 51 operates and the man conveyor 1 is disabled. On the other hand, when both the pair of limit switches 45 are turned on, the relay 51 does not operate,
The man conveyor 1 can be operated. The switch 52 shown in FIG. 3 is a safety switch provided in another part, and the switch 53 provided in parallel with the pair of limit switches 45 is a switch used when the man conveyor 1 is trial-run. is there.

Next, the operation of the safety device 40 of the first embodiment constructed as described above will be explained. When performing maintenance and inspection work on the man conveyor 1, first, the boarding / alighting board 3a,
3b must be removed from the machine frame 8 and the upper machine room 4a and the lower machine room 4b must be opened. Therefore, when the worker removes the bolt 9 that fixes the boarding / alighting plates 3a and 3b to the machine frame 8, the slide pin 46 of the safety device 40 is removed.
Is slid upward in the screw hole 8a in conjunction with the displacement of the bolt 9. Then, the free end of the swing arm 43 is also displaced upward, so that the swing arm 43 cannot push down the operation button 45a of the limit switch 45. As a result, the limit switch 45 is turned off, so that the relay 51 of the control circuit 50 is actuated and the man conveyor 10 becomes inoperable.

On the other hand, the slide pin 4 of the safety device 40
6 is housed inside a screw hole 8a into which a bolt 9 is screwed. As a result, even if the worker temporarily places the boarding / alighting plate 3a on the machine frame 8 or places a tool or the like, the slide pin 4
Since 6 does not displace, the man conveyor 1 can be reliably kept in an inoperable state.

After the maintenance and inspection work of the man conveyor 1,
To fix the boarding / alighting plate 3a to the machine frame 8, a worker attaches the bolt 9
Is screwed into the screw hole 8a, the slide pin 46 is pushed down by the bolt 9. Then, the free end of the swing arm 43 is displaced downward and the operation button 45a of the limit switch 45 is pushed down, so that the limit switch 45 is turned on. Then, a pair of safety devices 40 attached to the upper machine room 4a and the lower machine room 4b, respectively.
When both limit switches 45 are turned on, the relay 51 of the control circuit 50 operates and the man conveyer 1 becomes operable.

That is, the safety device 40 of the first embodiment.
Means that the bolt 9 for fixing the boarding / alighting plate 3a to the machine frame 8 has a screw hole 8
When it is removed from a, the man conveyer 1 is made inoperable, and the man conveyer 1 is made operable only after the bolt 9 is attached to the screw hole 8a.
While the maintenance work of the man conveyor 1 is being performed, the man conveyor 1 can be surely brought into the inoperable state.

Second Embodiment Next, a safety device for passenger conveyor according to a second embodiment of the present invention will be described with reference to FIG. As shown in FIG. 4, in the safety device 60 of the second embodiment, a rectangular parallelepiped recess 8c is formed on the lower surface 8b of the machine frame 8 of the passenger conveyor.
Is recessed. A communication hole 8d that communicates the inside of the recess 8c with the screw hole 8a is provided in the machine frame 8 so as to be orthogonal to the screw hole 8a. Communication hole 8
A cylindrical slide pin 61 is slidably fitted in d, and the tip of the slide pin 61 is retractable into and out of the screw hole 8a. A pressing piece 62 is fixed to the end of the slide pin 61 on the side of the recess 8c. The spring 63 accommodated in the recess 8c biases the slide pin 61 toward the screw hole 8a. On the other hand, the limit switch 6 is attached to the machine frame 8 of the escalator via the bracket 64.
5 is attached. The operation button 65a of the limit switch 65 is pushed by the pushing piece 62 fixed to the rear end of the slide pin 61.

As a result, in the state where the bolt 9 fixes the boarding / alighting plate 3a to the machine frame 8, the slide pin 61 is pushed toward the recess 8c by the side surface of the bolt 9, and the pushing piece 62 is pressed.
Pushes the operation button 65a of the limit switch 65. As a result, the limit switch 65 is turned on, and the escalator (not shown) can be operated. On the other hand, when the bolt 9 is removed from the screw hole 8a, the slide pin 61 is displaced toward the screw hole 8a by the biasing force of the spring 63, and the tip of the slide pin 61 projects into the screw hole 8a.
In this state, since the pressing piece 62 does not press the operation button 65a of the limit switch 65, the limit switch 6
5 is turned off, and the escalator (not shown) cannot operate.

That is, the safety device 60 of the second embodiment.
Since the slide pin 61 is housed in the communication hole 8d penetrating the machine frame 8 so as to be orthogonal to the screw hole 8a, compared with the safety device 40 of the first embodiment described above, The vertical dimension can be greatly reduced. As a result, even if the machine rooms 4a and 4b of the passenger conveyor 1 are small, the safety device 60 can be easily installed.

Third Embodiment Next, a safety device for a man conveyor according to a third embodiment of the present invention will be described with reference to FIG. As shown in FIG. 5, the safety device 70 of the third embodiment has a screw hole 8a.
Is attached to the lower surface 8b of the machine frame 8 so as to be adjacent to. The safety device 70 has a bracket 71 fixed to the lower surface 8b of the machine frame 8 and formed by bending a metal plate into a U-shape. A swing shaft 72 extending horizontally is attached to a vertical wall 71a fixed to the machine frame 8 of the bracket 71. An upper end of a swing arm 73 extending in the vertical direction is fixed to the swing shaft 72. As a result, the swing arm 73 is swingable around the axis of the swing shaft 72, but the lower end of the swing arm 73 contacts the stopper portion 71b at the tip of the bracket 71, so that the swing arm 73 has a predetermined angle or more on the screw hole 8a side. It is not possible to swing to. Further, it is attached to a part of the swing arm 73 in the longitudinal direction,
The rotary roller 7 is attached to the support shaft 74 extending in parallel with the swing shaft 72.
5 is rotatably fitted on the outside. On the other hand, the lower end of the swing arm 73 contacts the operation button 76a of the limit switch 76 mounted inside the bracket 71. A spring 77 is interposed between the limit switch 76 and the swing arm 73 to bias the swing arm 73 toward the screw hole 8a. Furthermore, boarding / alighting board 3
The bolt 9 for fixing a to the machine frame 8 has a total length so that the tip of the bolt 9 abuts on the rotary roller 75 when attached to the screw hole 8a.

Therefore, when the bolt 9 is screwed into the screw hole 8a for fixing the boarding / alighting plate 3a to the machine frame 8, the bolt 9
The lower end of the contact arm contacts the rotating roller 75, and the swing arm 73 is pressed toward the limit switch 76 side. As a result, the operation button 76a of the limit switch 76 is moved to the swing arm 73.
Is pushed by the lower end of the limit switch 76, and the limit switch 76 is turned on. On the other hand, when the bolt 9 is removed from the screw hole 8a, the swing arm 73 is pushed by the spring 77 and swings toward the screw hole 8a, and the lower end of the swing arm 73 contacts the stopper portion 71b at the tip of the bracket 71. In this state, the swing arm 73 operates the operation button 76a of the limit switch 76.
, The limit switch 76 is turned off, and the escalator not shown becomes inoperable.

That is, the safety device 70 of the third embodiment.
In the above, since the swing arm 73 is arranged so as to be substantially parallel to the longitudinal direction of the bolt 9 for fixing the boarding / alighting plate 3a to the machine frame 8, the bolt whose length is too long is mistakenly inserted in the screw hole 8a. Even when screwed in, there is no problem such as deformation of the swing arm 73. In addition, the rotating roller 7
Since 5 is brought into contact with the bolt 9, it is possible to prevent troubles such as abrasion of the swing arm 73 due to contact with the thread of the bolt 9.

The safety devices for passenger conveyors according to the first to third embodiments of the present invention have been described above in detail.
It is needless to say that the present invention is not limited to the above-described embodiment and various modifications can be made.
For example, the safety device of each of the embodiments described above is operated by removing the boarding / alighting plate provided at the entrance / exit of the escalator from the machine frame, but there is no need to be caught by this and the machine of the man conveyor The present invention is also applicable to a portion where a member such as a wall plate that closes a chamber is fixed to a machine frame with a bolt, a safety cover for covering a driving wheel and a drive chain that drives a passenger conveyor is fixed to the machine frame with a bolt, and the like. Applicable safety device.

[0024]

As is apparent from the above description, in the safety device for a man conveyer of the present invention, the bolts for fixing the boarding / alighting board for closing the machine room to the machine frame of the man conveyer are the screws formed on the machine frame. When it is removed from the hole, the man conveyor cannot be operated, and when the bolt is attached to the screw hole, the man conveyor can be operated.Therefore, remove the boarding / unloading board to perform maintenance work of the man conveyor. The man conveyor can be disabled while the machine room of the man conveyor is open. The control switch that controls the operation of the passenger conveyor operates in conjunction with the attachment / detachment of the bolts that secure the boarding / alighting board to the machine frame, so that the operator temporarily places the boarding / alighting board on the machine frame. Even if a tool or the like is placed, the man conveyor does not become operable. Therefore, according to the present invention, it is possible to provide a safety device that can surely disable the man conveyor while the man conveyor is being maintained and inspected.

[Brief description of drawings]

FIG. 1 is an overall side view of an escalator to which a safety device for passenger conveyor according to the present invention is applied.

FIG. 2 is a vertical sectional view showing a safety device for a passenger conveyor according to the first embodiment of the present invention.

FIG. 3 is a circuit diagram of a safety circuit in which switches of the safety device for passenger conveyor according to the first embodiment of the present invention are incorporated.

FIG. 4 is a vertical cross-sectional view showing a safety device for passenger conveyor according to a second embodiment of the present invention.

FIG. 5 is a vertical sectional view showing a safety device for a passenger conveyor according to a third embodiment of the present invention.

FIG. 6 is a perspective view showing a state in which a boarding / alighting board of an escalator entrance / exit opening is removed.

FIG. 7 is an overall perspective view of a conventional safety device for passenger conveyor.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 escalator 2 boarding / exiting board 3 boarding / unloading board 4 machine room 5 motor 6 drive chain 7 control device 8 machine frame 9 bolt 40 safety device of the first embodiment 41 bracket 42 horizontal shaft 43 swing arm 44 spring 45 limit switch 46 slide pin 47 Support shaft 50 Control circuit 51 Relay 60 Safety device of the second embodiment 61 Slide pin 62 Pushing piece 63 Spring 64 Bracket 65 Limit switch 70 Safety device of the third embodiment 71 Bracket 72 Swing shaft 73 Swing arm 74 Spindle 75 Rotating roller 76 Limit switch 77 Spring

Claims (4)

[Claims] 1. A bolt for fixing a boarding / alighting board for closing a machine room of a man conveyor to a machine frame of the man conveyor is interlocked with a displacement of the bolt when the bolt is attached to and detached from a screw hole formed in the machine frame And a control switch that is turned on and off according to the displacement of the interlocking member, wherein the control switch enables the man conveyor to operate when the bolt is attached to the machine frame, and A safety device for a man conveyor, wherein the man conveyor is controlled so as to make the man conveyor inoperable when the bolt is removed from the machine casing. 2. The interlocking member is urged by urging means to swing toward the screw hole when the bolt is removed from the screw hole, and the bolt is attached to the screw hole. The rocking member, which is rockably supported by the machine frame, is sometimes pushed by the bolt and rocks on the side opposite to the screw hole. Safety device for passenger conveyor. 3. The interlocking member, when the bolt is removed from the screw hole, is urged by urging means so that a tip of the interlocking member projects into the screw hole, and the bolt is attached to the screw hole. The slide member is fitted in a slide hole penetrating the machine frame and is pushed back by the bolt and retracts to the side opposite to the screw hole. 1. The safety device for passenger conveyors according to 1. 4. The safety device for a passenger conveyor according to claim 3, wherein the slide member is arranged so as to abut a side surface of the bolt.