JPS5916384Y2 - Elevator door safety device - Google Patents

Description

[Detailed Description of the Invention] This invention relates to an improvement of a safety device for an elevator door.

FIGS. 1 and 2 show an example of a conventional elevator door safety device.

In the figure, 1 is an elevator car, 2 is an entrance to the elevator car 1, and 3 and 3' are sliding doors, which are suspended from a rail 19 provided above the entrance 2 so as to be able to run freely, and are mounted on a sill 7 provided at the lower end of the entrance 2. It is configured to move while being guided and open/close the entrance/exit 2.

An operating cam 5 is rotatably attached to the sliding door 3 by a support shaft 4, and the operating cam 5 is connected to a protruding piece 7a projecting above the sill 7 via operating links 6a and 6b. The operating cam 5 is rotated according to the opening and closing of the operating cam 5.

Note that the protruding piece 7a is arranged on the door pocket side of the sliding door 3.

The operating cam 5 is formed in a triangular shape, and a rotary plate 9 is attached to the supporting plate 8 fixed to the sliding door 3 and close to the operating cam 5.
It is pivoted so that it can rotate freely at 0.

A roller 11 is rotatably attached to the rotating plate 9, and the roller 11 is pressed against the operating cam 5 by the spring force of a spring 12.

A lower link 13 is mounted on a support shaft 10 coaxially with the rotating plate 9, and a stopper 14 and an obstacle detection switch 15 are in contact with the lower end of the lower link 13, and these are attached to the rotating plate 9. It is provided.

A safety shoe 16 is pivotally attached to the upper end of the lower link 13 with a pin, and an upper link 17 is attached to the upper part of the shoe 16.
One end is pivotally connected by a pin, and the other end of the upper link 17 is pivotally connected to a support plate 18 fixed to the sliding door 3 by a pin.

The safety shoe 16 is configured to protrude movably from the inner edge of the sliding door 3 toward the retractable side.

The elevator door safety device configured as described above is
At the opening/closing end of the sliding door 3, the distance between the spindle 4 and the roller 11 increases due to the rotation of the operating cam 5, and the stopper 14 of the rotating plate 9 pushes the lower link 13 against the weight of the safety shoe 16. , the safety shoe 16 either protrudes a little from the sliding door 3 or becomes retracted from the sliding door 3.

Further, at the center position of the door closing operation, the distance between the support shaft 4 and the roller 11 decreases, and the amount of protrusion of the safety shoe 16 with respect to the sliding door 3 increases.

Furthermore, when the safety shoe 16 hits an obstacle during the door closing operation, the required pushing amount of the safety shoe 16 is approximately the same over the entire door closing operation until the switch 15 detects this. Yes, switch 15
It is possible to detect obstacles by operating the

In addition, although the above-mentioned explanation of the structure and operation was given for one side of the sliding door 3, the other sliding door 3' has a left-right symmetrical structure and operates in the same manner, so the explanation will be omitted.

The safety device as described above includes the operating cam 5, the links 6a, 6
It requires many parts such as b, which increases the manufacturing cost, and since the protrusion dimension of the safety shoe 16 from the sliding door 3 is adjusted by the operating cam 5, a long adjustment time is required.
There is a problem in that it is difficult to manage dimensions through adjustment.

This invention solves the above-mentioned problems and allows the sliding door to be fully closed.
A safety device for elevator doors that prevents malfunctions by operating the door close/open detection switch when the door is fully open, and also allows the sliding door to be opened by pushing in the safety shoe, making it easy to adjust the stroke of the safety shoe, etc. The aim is to provide it at a low price.

An embodiment of this invention will be described below with reference to FIGS. 3 to 7.

In the figure, 1 is an elevator car, 2 is an entrance/exit, and 3°3' is a sliding door.These have the same structure as those in Figures 1 and 2, and the same symbols as in Figures 1 and 2 correspond. Show parts.

14, 14' are stoppers provided on the support plate 8.8' located below the support shaft 10 of the lower link 13.13' and fixed to the sliding door 3, 3';
are arranged so that the lower links 13.13' abut.

15.15' is the lower link 13°13 on the support plate 8,8'
' an obstacle detection switch 15a provided so as to be able to come into contact with it;
, 15a' closes when the lower link 13.13' is in contact with the switch 15°15', and the lower link 13.13
These contacts, 16.16', which are open when 'is away from the switch 15.15', are connected to the safety shoe 1, which projects by a predetermined distance from the opposite inner edge of the sliding door 3, 3'.
16a, 16a' are projections projecting upward from the upper surface of the rear end of the safety shoe 16, 16'; 21 is a sliding door 3;
, 3' is provided at the center of the suspension rail 19 of the sliding door 3.
, 3' is a stopper arranged so that the upper ends of the safety shoes 16, 16' come into contact when the safety shoes 16, 16' are fully closed.

22. 22' is provided on both sides of the stopper 21, and door closing detection is arranged so that the protrusions 16a, 16a' of the safety shoes 16, 16' come into contact when the sliding doors 3, 3' are fully closed. The switches 22a, 22a' close when the projections 16a, 16a' abut against the switches 22, 22' at the fully closed end of the sliding door 3°3', and are otherwise open at the contacts of the switch 22, 22'. Yes, contacts 22a, 22
a' closes when the distance between the upper ends of the safety shoes 16, 16' and the stopper 21 becomes equal to or less than the dimensions A and A' in FIG. 5, and opens when the distance exceeds the dimensions A and A'. has been done.

22b, 22b' are the cables of the switch 22.22'.

23.23' is a stopper provided on the sill 7 so that the lower end of the lower link 13.13' comes into contact when the sliding doors 3, 3' are fully opened, and 24.24' is a stopper 23.23'.
is fixed to the lower link 1 when the sliding doors 3 and 3' are fully opened.
Door open detection switches 24a and 24a' arranged so that the lower link 13.13' comes into contact with the switch 24°24' close when the sliding door 3°3' is fully opened. Otherwise open switch 24.24'
This is the point of contact.

Reference numeral 25 denotes a reversal detection relay that detects that at least one of the safety shoes 16 and 16' has been pushed in due to collision of the safety shoes 16 and 16' with an obstacle during the door closing operation.

Note that 17° and 17' are upper links, and 18 and 18' are support plates, which have the same structure as those shown in FIGS. 1 and 2.

Furthermore, as shown in FIG. 7, a circuit in which contacts 15a and 15b of obstacle detection switches 15 and 15' are connected in series, and contacts 22a and 22 of door closed detection switches 22 and 22' are connected in series.
2a' are connected in series, and the door open detection switch 2
A circuit in which contacts 24a and 24a' of contacts 4 and 24' are connected in series is connected in parallel to a reversing relay 25, and when the power is de-energized, this loop 25 forms an obstacle detection circuit and opens the door. have them do it.

The operation of the elevator door safety device configured as described above will be explained.

During the door closing operation, the lower link 13.13' is in contact with the stopper 14.14' due to the weight of the safety shoes 16, 16', so the safety shoes 16, 16' are closed from the sliding doors 3, 3'. It protrudes by a predetermined distance.

At this time, if an obstacle comes into contact with the safety shoe 16 or 16' and pushes the safety shoe 16 or 16', the contact 15a or 15a' of the switch 15 or 15'
opens.

At this time, the switches 22 and 22' are connected to the safety shoe 16,
Since the contact points 22a and 22a' are not in contact with the projections 16a and 16a' of the contact point 16', the contacts 22a and 22a' are open.

Therefore, the reversal detection relay 25 is deenergized and the sliding door 3,
3' is stopped, reversed, and opened.

Also, when the protrusions 16a, 16a' of the safety shoes 16, 16' touch the switch 22, 22' at the closing end of the door, the distance between the safety shoes 16, 16' and the stopper 21 becomes dimension A. , A', the contacts 22a, 22a' close.

Furthermore, when the door is closed, the safety shoe 16,
16' comes into contact with the stopper 21, and after that, the safety shoes 16, 16' stop, and the sliding doors 3, 3' continue to close, so that the safety shoes 16, 16' close the sliding doors 3, 3'. The amount of protrusion decreases.

This causes the lower links 13, 13' to pivot and separate them from the switch 15.15', opening the contacts 15a, 15a'.

However, the (+) side of the power supply in Fig. 7, the closed contact 22
a.

22a', the reversal detection relay 25, and the (-) side circuit of the power supply constitute a malfunction prevention circuit, and since current flows through the relay 25, this relay 25 remains energized and prevents the door from closing. continue.

When an obstacle comes into contact with the safety shoe 16 or 16' and pushes at least one of them at a position where the distance between the safety shoe 16 or 16' and the stopper 21 is smaller than the dimension A or A', the contact 22 a or 2
2a' opens, and at this time, the lower link 13.13' is not in contact with the switch 15°15', so the contacts 15a,
15a' is open.

Therefore, an obstacle detection circuit is configured, the reversal detection relay 25 is deenergized, and the sliding doors 3, 3' are stopped and reversed to open.

Next, at the end of the door opening operation, when the lower link 13.13 abuts the switch 24.24', the switch 24.24
The contacts 24a, 24a' close.

For this reason, the (+) side of the power supply in Figure 7, the closed contact 2
4a, 24a', reversal detection relay 25, current flows through the relay 25 in the (→ side circuit of the power supply), and this relay 25 maintains the energized state.

If the door opening operation continues, the safety shoes 16, 16
' comes into contact with the stopper 23.23', and the lower link 13,
13' rotates and the safety shoes 16, 16' are retracted from the sliding doors 3, 3', so that the safety shoes 16, 16' do not narrow the effective width of the entrance/exit 2 when the sliding doors 3, 3' are fully opened. be drawn into.

At this time, due to the rotation of the lower links 13 and 13', the switches 15 and 15' are separated from these, and the contacts 15a and 15a
' is opened, but the reversal detection relay 25 is maintained in the energized state in the circuit described above.

Further, when the sliding doors 3, 3' are fully open, elevator passengers or the like may wish to keep the sliding doors 3, 3' open.

In this case, when the safety shoe 16 or 16' is pushed in by the dimension A or A', the lower link 13 or 1
3' rotates away from switch 24 or 24', and contact 24a or 24i is opened.

At this time, the switch 15.15' has already been switched to the lower link 13.
．． 13' and contacts 15a and 15i are open, the reversal detection relay 25 is deenergized and the sliding doors 3,
3' or 2' The door is held open.

Next, when the sliding doors 3, 3' start closing from the fully open state, the distance between the sliding doors 3, 3' and the stopper 23.23' begins to increase, so the lower link 13.13' begins to rotate. Before contacts 24a, 24a' of switch 24.24' are opened, contacts 15a, 15 of switch 15.15' are opened.
a' closes, and then contacts 24a, 24a' open.

Further thereafter, the lower link 13.13' is moved to the stopper 23.
．． 23', the lower link 13.13' abuts the stop 14.14' and the safety shoes 16, 16
' protrudes a predetermined distance from the sliding doors 3, 3' due to its own weight and performs the door closing operation.

Therefore, the reversal detection relay 25 remains energized even at the start of the door closing operation.

And the contacts 24a, 24a' of the switch 24°24'
When the safety shoes 16, 16' are pushed in at the position before opening, the contacts 24a, 24a' open, the reversal detection relay 25 is deenergized, and the sliding doors 3, 3' stop, reverse, and open.

Switches 24a, 24a' open and lower link 13.1
When the safety shoe 16° 16' is pushed in in the closed position where the door 3' is in contact with the stopper 23.23', the lower link 13.13' rotates and separates from the switch 15.15'. The contacts 15a and 15a' open, the relay 25 is deenergized, and the sliding doors 3 and 3' are stopped and reversed to open.

Therefore, this elevator door safety device, like the conventional one shown in FIGS. an operating cam 5 capable of performing the operation;
Since the operating links 6a, 6b and the rotating plate 9 are not provided, the dimensions of the safety shoes 16, 16' protruding from the sliding doors 3, 3' can be easily adjusted, and manufacturing costs can be reduced.

Furthermore, since the switch 22.22' was attached to the stopper 21, which is a fixed member, without being attached to a movable body such as a sliding door, the cable 22a of the switch 22.22'.

22a' can be wired with a wiring cable instead of a cap tire cable, and there is no need to make any wiring adjustments.
An additional advantage is that manufacturing costs can be reduced since the cables can be of general wiring type.

As explained above, in this invention, the door closed and door open detection switches are installed on the stationary side of the rail and the stopper of the sill, so manufacturing costs can be reduced compared to installing them on movable objects such as sliding doors. Since the door closed detection switch is operated by the protrusion projecting upward from the rear end of the safety shoe, and the door open detection switch is operated by the lower end of the lower link, the lower and upper links of safety shoe 1 are operated. It only needs a simple shape, and there is no need to increase the number of parts or make existing parts into complicated shapes to operate the door closed and door open detection switches. Therefore, it can be manufactured at low cost, and it can be used to detect when the sliding door is fully closed, close to fully open, and open/closed. Each switch can be operated with the same pushing stroke of the safety shoe at any point in the middle of the stroke, and combined with the fact that the switch detects contact with the stopper, the stroke of the safety shoe is This has the effect of providing an elevator door safety device that is easy to adjust.

[Brief explanation of drawings]

Figure 1 is a front view showing an example of a conventional elevator door safety device, Figure 2 is an enlarged front view showing the main parts of Figure 1, and Figure 3 is a front view showing an example of a conventional elevator door safety device.
FIG. 4 is a front view of the safety device for an elevator door according to an embodiment of the present invention when the door is closed; FIG. 4 is a front view of the elevator door when it is open; FIG. FIG. 6 is an enlarged front view showing the lower part of one side of FIG. 4, and FIG. 7 is a circuit configuration diagram. 3.3'...Sliding door, 16.16'...
・Safety shoe-121...Stopper, 22
．． 22'...Switch. Note that the same reference numerals in the figures indicate the same or corresponding parts.

Claims (1)

[Scope of utility model registration request] Sliding doors 3, 3' are movably suspended from a rail 19 provided above the entrance/exit 2 and are guided by a sill 7 provided at the lower end of the entrance/exit 2, and a lower link pivotally connected to the sliding doors 3, 3. A safety shoe 1 is supported by 13.13' and upper link 17.17' and protrudes from the front end of the sliding door 3, 3' so that it can be pushed in parallel by a predetermined stroke.
6, 16', an obstacle detection switch 15.15' provided on the sliding door 3, 3' and abutting the lower part of the lower link 13.13', and an obstacle detection switch 15.15' provided on the rail 9. Safety shoe 16 at the end of the door closing
, 16' come into contact with a stopper 21, and the stopper 21 is provided with protrusions 16a, 16a' that protrude upward from the rear ends of the safety shoes 16, 16', and the door closing end comes into contact with protrusions 16a, 16a'. A door closed detection switch 22.22' is provided at the threshold 7, and a lower link 13.1 is provided near the door fully open.
Stoppers 23, 23' with which the lower ends of 3' abut, and lower links 13 provided on these stoppers 23, 23'.
．． Door open detection switches 24, 24, (and obstacle detection switches 15, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24, which are in contact with the lower end of the door 13' when the door is fully open.
15' contacts 15a, 15a' and door closed detection switch 22
．． 22' contacts 22a, 22a' and door open detection switch 2
A reversing relay 25 is connected in parallel with circuits 4 and 24a and constitutes an obstacle detection circuit that opens the door when the safety shoe 16, 16' is pressed. The contacts 15a, 15a' of the object detection switch 15, 15' are at the door closing end, and before opening, the contacts 22a, 22a' of the door closing detection switch 22, 22' are pressed by the safety shoes 16, 16'. Before the contact points 15a, 15a' of the obstacle detection switch 15.15' open when the door is fully open, the contacts 24a, 24a' of the door open detection switch 24.24' close the safety shoe 16 so that the door can be opened. , 16' is configured to be opened and closed by pushing in the elevator door.