JPS6338217Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a safety device for an escalator, and particularly to one provided with a mechanism for holding a step chain when it is cut.

Conventionally, as shown in FIGS. 1 and 2, the rotational force of a hoist 2 installed in a machine room 1 of an escalator rotates a drive wheel 4 through a drive chain 3, thereby making it possible to install a step 6A. The available step chain 5 is driven. The step chain 5 is guided by a guide rail 6 and has an endless shape, and a tension device for a driven wheel 8 is provided in the lower machine room 7 of the escalator to absorb the tension and pulsation of the step chain.

In the lower machine room 7, the bearing 9 of the driven wheel 8 is mounted on the bogie 1.
0, and the trolley 10 is provided with rollers 11 to ensure smooth movement.

A rod 12 is provided in the trolley 10 through a hole 13 fixed to the escalator truss, and on the opposite side a spring 14 is fixed by a nut 15.

In this tensioning device, the step chain 5 is connected to the driven wheel 8.
This is a device for tensioning the carriage 10 in order to absorb the pulsation of the step chain 5 caused by the polygonal movement when passing through the carriage. Therefore, since tension is applied to the step chain 5, if the step chain 5 were to break, the carriage 10 would be moved by the spring 14, and the nut 15 would also be moved. The switch 17 is configured to be driven by this amount of movement by a cam 16 attached with a nut 15. According to this configuration, when the step chain 5 is disconnected, the switch 17
can be activated. By incorporating the contact signal of the switch 17 into the control circuit of the electric motor of the hoisting machine 2, when the step chain 5 is disconnected, the electric motor is immediately stopped and the brake is applied to stop the operation of the escalator to maintain safety. The method was used.

However, the safety provided by this device is such that when only one step chain 5 is cut off, the step can be held by the other step chain 5, but in the event that both step chains 5 are cut off, the above mentioned safety The device is ineffective and the more passengers there are, the more likely it is to descend with passengers on board.

The present invention has been made in consideration of the above, and has been devised to safely stop the escalator even if the step chain 5 breaks and descends due to the load of passengers.

An embodiment of the present invention will be described below based on the drawings.

As shown in FIGS. 3 to 5, the guide rail 6
A step 6A disposed along the main body frame 27 along a step shaft 22 extending between the left and right step chains 5 (not shown) that continuously hold the step, and a step shaft 22 extending between the left and right step chains 5. A shock absorbing device consisting of a cylinder 24, a plunger 25, etc. arranged parallel to the side is fixed to the main body frame 27.

A rotatable hinge shaft 20 is provided on the cylinder 24 in parallel with the step shaft 22,
Further, hooks 21 having cut portions for hooking the step shaft 22 and holding it downward are integrally provided at both ends of the hinge shaft 20. This hook 21 is constructed so that the side engaging the step shaft is lowered by gravity.

As shown in Fig. 3, the hook 21 is normally retracted as shown by the solid line so as not to hit the step shaft 22, and when the step chain is cut, the lower part protrudes as shown by the chain line and engages the step shaft to keep it lowered. .

The method for retracting or protruding the hook 21 is carried out by cooperation between an electromagnetic device attached to the shock absorbing device and a conventional safety device for detecting when a step chain is cut.

That is, a solenoid 36 consisting of a magnetic coil 35, a plunger 37, a protrusion 34, etc., a pin that engages with the protrusion 34 of the solenoid 36 to generate a counterclockwise rotational moment, and is pivoted on the main body frame 27 side. A lever 31 having a hinge 32 is provided, and a spring 33 whose other end rotates in the opposite direction acts with the body frame 27 side as a fulcrum.

Therefore, under normal conditions, the spring 33 is compressed by the energization of the solenoid 36. At that time, the hook 21 passes through the lever 3 through a roller 30 provided on its extension.
In order to contact and follow the back surface of 1 by gravity, the third
It is held in the retracted position as shown by the solid line in the figure.

On the other hand, when the step chain is disconnected, the switch 17 shown in FIG. As a result of pressing the provided roller 30 downward, the hook 21 moves to the step shaft 2 as shown by the broken line in FIG.
The step chain is protruded into the movement space of 2, and the step chain is stopped and held thereafter while being buffered by the step shaft 22 which is first engaged, the plunger 25, and the oil buffer of the cylinder.

In other words, the present invention includes a hoisting machine 2 and a driving wheel 4 in the upper machine room 1, a driven wheel 8 in the lower machine room 7, a guide rail 6 passed between them, and the guide rail 6, the drive wheel 4, and the driven wheel 8. An endless step chain 5 is provided on the left and right sides, a step shaft 22 is provided between the left and right step chains 5, a step 6A is attached to the step shaft 22 and has a continuous configuration, and the step chain 5 is detected when the step chain 5 is cut. In this escalator, the escalator is equipped with a switch 17 which is provided along the step chain 5 and includes a shock absorber including a cylinder 24, a plunger 25, etc., and a step shaft 22 which acts on the shock absorber and is rotatably supported on the step chain. 5. A hook 21 to be held when cutting the step chain 5. The hook 21 is normally stored, and when the step chain 5 is cut, the hook 21 is equipped with an electric opening mechanism that protrudes the hook 21 in response to an escalator stop signal. This is a safety device for escalators.

That is, in the normal state where the step chain 5 is not disconnected, the magnet coil 35 is energized, so the magnet is in an attracted state.
The state shown in the solid line shown in FIGS. 3 to 5 is reached, and there is a clearance between the step shaft 22 and the hook 21, and the escalator can operate normally.

When the step chain is disconnected, the switch 17 is opened and the magnetic coil 35 is demagnetized, so the hook 21 moves and the step shaft 22
prevent it from descending.

Furthermore, this magnetic coil not only receives this contact output, but also a signal that detects that the speed is too fast than the steady speed in the downward direction, and a signal that detects that the escalator is moving in the opposite direction to the rotating direction of the hoisting machine. The range of protection can be widened by passing a signal that detects that the escalator step is moving even when no voltage is applied to the motor.

As a result of the above, when the step chain of the escalator is disconnected, the descent of the escalator is stopped,
It is possible to provide a device that can prevent accidents.

[Brief explanation of the drawing]

Fig. 1 is a side sectional view of the escalator, Fig. 2 is a conventional sectional view of the escalator lower machine room, Fig. 3 is a structural diagram of the safety device according to the present invention, and Fig. 4 is the third
FIG. 5 is a plan view of the lower side of FIG. 4, and FIG. 6 is a circuit diagram of the escalator safety device. 1... Machine room, 5... Step chain, 6...
...Guide rail, 6A...Step, 17...Switch, 20...Hinge shaft, 21...Hook, 22...Step shaft, 33...Spring,
36...Solenoid.

Claims (1)

[Scope of Claim for Utility Model Registration] A hoist and drive wheel in the upper machine room, a driven wheel in the lower machine room, a guide rail passed between them, and an endless step arranged on the guide rail, the drive wheel, and the driven wheel. A step shaft with a chain provided on the left and right sides and passed between the left and right step chains, a continuous step attached to this step shaft,
In an escalator equipped with a switch that detects when the step chain is cut, a buffer device provided along the step chain, and a hook that acts on the buffer device and holds the step shaft rotatably supported when the step chain is cut. . A safety device for an escalator, characterized in that the hook is normally retracted and is equipped with an electric opening mechanism that protrudes the hook in response to an escalator stop signal when the step chain is disconnected.