JPS5997985A - Brake grear for main shaft of escalator - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a main shaft brake device for a 2μ router.

Figures 1 and 2 show a conventional device of this type.
A step chain 1 & to which a step row 1 is attached is wound around a main driving sprocket 2 and a driven sprocket 3 arranged on the upper and lower floors.

A driven tin rocket 5 is further attached to the main shaft 4 to which the main drive sprocket 2 is attached, and a drive chain 8 is wound around the splot 5 and the drive sprocket 7 of the drive gear reducer 6. ing. The power from the drive gear reducer 6 is transmitted to the main drive tin rocket 2 through the same chain 8.
transmitted to.

A motor 9 is directly connected to the drive speed reducer 6, and a brake lO is installed on the shaft of the motor.

The brake is for braking the step row 1 when the escalator is stopped; that is, the braking force of the brake is transmitted to the main drive tin rocket 2 via the drive gear reducer 6 and the drive chain 8. Therefore, if the chain breaks, the main drive tin rocket 2 will be in an unbraked state, and therefore, if a large number of passengers are on the step row 1, the escalator that was in ascending mode will not be able to reverse movement due to the weight of the passengers. On the other hand, if an escalator is in a downward operation, it will be accelerated, which is very dangerous, so a main shaft brake is usually provided to apply a braking force directly to the main shaft 4.

Figure 2 shows such a main shaft brake device, in which the main shaft 4
A ratchet wheel 11 is held by friction, and a lever 12 that can be freely engaged with a pawl 11a of the wheel 11 is provided. The lever operates when the drive chain 8 breaks and engages with the pawl 11a.

Therefore, such a brake device is effective against breakage of the drive chain 8, but if a power transmission member other than the chain, such as the gear of the drive gear reducer 6, is damaged, or for some other reason, the brake of the motor shaft is 10 is not activated, no braking force is applied to the step row l.

Therefore, in addition to the brake 10 on the motor shaft, it has been proposed to install a large electromagnetic drum brake on the main shaft 4 as a main shaft brake that directly applies braking force to the main shaft 4. A large force is required to open the arm having the lining that presses against it against the spring force, and as a result, the tta coil has to be large, making it difficult to put it into practical use.

The object of this invention is to eliminate the above-mentioned drawbacks by placing a ratchet wheel in pressure contact with seven lunges attached to the main shaft and applying a braking force to the main shaft by engaging a lever with the ratchet wheel. shall be.

The present invention will be described below with reference to embodiments shown in the drawings.

As shown in FIGS. 3 and 4, the main shaft 4 has a flange 1.
3 is fixed thereto, and an annular projection 14 is provided on the inner surface of the flange. This protrusion has a plurality of through holes 15 formed around its entire circumference, and bolts 1 are inserted into the holes.
6 has been inserted.

An annular auxiliary disk 17 is attached to the bolt through a through hole 18, and a coil spring 19 is mounted on the bolt. A hole 20 is provided at the tip of the bolt 16, and a threaded rod 21 is screwed into the hole 20.

A pusher tube 22 having a flange is slidably attached to the rod 21, and a nut 23 is screwed thereto. The coil spring 19 has auxiliary discs 17 at both ends.
and the flange of the pusher pipe 22. Therefore, by screwing the nut 23, the pusher #22 is brought into contact with the auxiliary disk 17.
As a result, the coil spring 19 is pressed against the circular plate 17. These auxiliary disks 17. The bolt 16 and the coil spring 19 constitute a pressing portion A for pressing a later-described ratchet wheel against the flange 13.

An annular ratchet wheel 24 is inserted between the flange 13 and the auxiliary disk 17. Same wheel 240
A friction material 25 such as a lining is attached to both measuring surfaces, and the wheel is attached to the flange 13 through the friction material 25.
and the auxiliary disk 17. This clamping force is adjusted by screwing in the nut 23.

The ratchet wheel 24 is mounted so that its peripheral surface faces the annular projection 14, but at this time, a low-friction material 26 such as a Teflon sheet is placed between them so that the wheel and the annular projection 14 do not come into direct sliding contact. Insert.

In FIG. 3, reference numeral 27 denotes a lever, which is swingably supported on a support base 28 via a pin 29, and one end of which can be freely engaged with the pawl 24m of the ratchet wheel 24. The other end is given a biasing force by a spring 30 in a clockwise direction in the figure. Furthermore lever 2
A connecting pin 31 is attached between the other end of 7 and the pin 29, and the plunger 33 of the tILv & coil 32
and the lever 27 are connected via a connecting pin 31.

When the escalator stops, the power to the motor 9 is cut off and the brake 10 performs a braking operation. This point is the same as the conventional one, but in the present invention, the electromagnetic coil 32 is further deenergized, and therefore the counterclockwise rocking force by the plunger 33 is eliminated, so that the lever 27 is moved by the spring 3o. Don't let it rock clockwise,
As a result, one end of the lever 27 engages with the pawl 24a of the ratchet wheel 24, so that the rotation of the ratchet wheel 24 is stopped. However, the main shaft 4 tries to continue rotating due to inertia,
Since a frictional force is generated between the friction material 25, the seven flange 13, and the auxiliary disk 17, the main shaft 4 is braked.

Contrary to the above, when the escalator enters the starting state, the electromagnetic coil 32 is energized, so the granger 33 applies a counterclockwise rocking force to the lever 27 via the pin 29, and as a result, the lever The engagement between one end of 27 and the pawl 24a is released, and operation becomes possible.

The counterclockwise rocking force caused by the electromagnetic coil 32 is the elastic force of the spring 300 and the force of the claw 24m when the engagement is released.
It is sufficient to overcome the frictional force between the lever 27 and the lever 27, and therefore, a small electromagnetic coil 32 is sufficient.

In this way, the main shaft brake can always be operated when the L-router is stopped, regardless of whether it is a normal service stop or an emergency stop due to the operation of a safety device.

Generally, it is dangerous to operate two brakes, namely the motor brake lO and the main shaft brake, because the stopping distance of the step is short and the passenger may fall. Therefore, during service stoppages, the main shaft brake is Consideration is given to the electric circuit so that the brake 10 of the motor is delayed. In other words, when the machine is stopped at 7L, the motor power is cut off and the motor brake lO is operated at the same time.
Operate the main shaft brake just before the step almost stops.

However, if the switch for detecting breakage of the drive chain 8 is operated, the motor brake 1o is of no use, so the main shaft brake is operated immediately after the switch is operated.

FIG. 5 shows another embodiment of the present invention, in which a pair of ratchet wheels 24 are used to clamp the seven flange 13 through a friction material 25. In the figure, 34 is a fastener for connecting the pair of ratchet wheels 24.

By the way, in the case of FIG. 3, pawl 2 of ratchet wheel 24
Braking from the 4m direction can only be performed when the escalator is running in the downward direction. If it is desired to perform braking during the ascending operation, the shape of the pawl 24a of the ratchet wheel 24 and the shape of one end of the lever 27 that engages with the pawl 24a may be made into a U-shape as shown in FIG.

In the case of FIG. 3, even when driving in the downward direction, the time required to actually start braking is determined by the positional relationship between one end of the lever 27 and the pawl 24a when the lever 27 is operated, that is, the time required for the lever 27 and the pawl 24a to engage. Although there may be variations in the time it takes to do so, the main shaft brake's roles of preventing reversal during ascending operation, braking during descending operation, and maintaining the step are achieved.

Figure 7 shows the pawl 24m of the ratchet wheel 24 and the lever 2.
7, which is the fulcrum of the lever 27.
9 is a ratchet wheel 240 drawn from the tip of the claw 241L at the engagement point to minimize the reaction force during engagement.
Provided on the tangent at of the circle.

Also, when the Ezu Shio Itoyo is started, the lever 27 swings and the claw 24
It is preferable that the angle 0 of the claw 24 & with respect to the normal n be larger than 0° because the angle 0 of the claw 24 & with respect to the normal n must be broken from the locking with a.

However, in order to prevent the lever 27 and the pawl 24a from coming out of engagement during braking, it is necessary to set tanll(μ. Here, μ is the coefficient of friction between the pawl 24a and the lever 27.

As described above, the present invention has a lever that engages the ratchet wheel when the electromagnetic coil is deenergized, and the ratchet wheel and the flange of the main shaft are brought into pressure contact via the friction material. If the escalator is deenergized when stopped, braking force will always be applied to the main shaft, making it possible to safely stop the escalator even if there is a problem other than a broken drive chain, such as when the motor brake does not work. .

Further, the electromagnetic coil may be small for the reasons mentioned above, and therefore an inexpensive and compact main shaft brake can be provided.

[Brief explanation of the drawing]

Fig. 1 is a side view of an escalator, Fig. 2 is a side view of a conventional device, Fig. 3 is a side view of the device according to the present invention, and Fig. 4 is a side view of an escalator.
The figure is a sectional view taken along line ff-IV in Figure 3, Figure 5 shows another embodiment of the invention and is a view equivalent to Figure 4, and Figure 6 is a side view showing a different example of the ratchet wheel and lever. 7 are enlarged views showing the positional relationship between the ratchet wheel and pawl in FIG. 3. Agent Makoto Kuzuno - (1 other person) O 2 Self 5 ta Figure 7

Claims (1)

[Claims] A device comprising a main drive sprocket and a driven sprocket around which a step chain to which a step row is attached is wound, and a ratchet wheel housed in a main shaft of the main drive sprocket, wherein the ratchet wheel is held swingably. a lever that can be freely engaged with the ratchet wheel; a resilient member that resiliently biases the lever in the direction of engagement with the ratchet wheel; and an electromagnetic device that swings the lever in the direction of disengaging the two-check wheel. It is characterized by comprising a coil, a friction member disposed in a gap between a side surface of the ratchet wheel and seven flange fixed to the main shaft, and a suppressing part that presses the ratchet wheel to the seven flange. Engineering X1L-Yu's main shaft brake system.