WO2012086069A1

WO2012086069A1 - Door device for elevator

Info

Publication number: WO2012086069A1
Application number: PCT/JP2010/073397
Authority: WO
Inventors: 健介今城; 浩一山盛
Original assignee: 三菱電機株式会社
Priority date: 2010-12-24
Filing date: 2010-12-24
Publication date: 2012-06-28
Also published as: KR20130125794A; EP2657174B1; KR101541628B1; JPWO2012086069A1; CN103282301A; EP2657174A4; JP5569595B2; EP2657174A1; CN103282301B

Abstract

Provided is a door device for an elevator, configured so that the displacement of the door can be appropriately minimized even if en external force acts on the door due to wind pressure, etc. The door device is provided with: a hanger roller and a retaining roller which are rotatably provided to a door hanger; a support body for supporting a door rail; and a displacement minimizing device provided to the door hanger. The displacement minimizing device is a device for minimizing the displacement of the door in the direction of the axis of the hanger roller. The displacement minimizing device is provided with: a first guide roller which, as the door is opened and closed, rotates while being in contact with one side surface of a portion of the support body; and a second guide roller which, as the door is opened and closed, rotates while being in contact with the other side surface of the portion of the support body.

Description

Elevator door equipment

This invention relates to a door device installed in an elevator hall or a car.

Patent Document 1 below discloses a technique for preventing the door from coming off when an excessive force is applied to the door of the elevator. Specifically, in the door device described in Patent Document 1, a plate material is disposed so as to face the side surface of the door rail with a slight gap G, and the hanger roller is prevented from being detached from the door rail.

Japanese Unexamined Patent Publication No. 54-75834

Some elevators installed in skyscrapers control the pressure in the elevator car to prevent the ride comfort from being deteriorated due to changes in atmospheric pressure. In addition, when the elevator hall is installed in a tunnel, the elevator door may receive wind pressure when a vehicle moving at high speed passes.

When the door device described in Patent Document 1 is applied to such an elevator, the door is pushed by the pressure or wind pressure, and the plate material and the door rail may come into contact with each other. In addition, when a board | plate material contacts a door rail, abnormal noise will generate | occur | produce at the time of opening and closing of a door. In addition, the running resistance of the door is increased, which may hinder opening and closing.

FIG. 10 is a side view showing a conventional elevator door device, and FIG. 11 is a view showing a state when pressure is applied to the door in the door device shown in FIG.

As shown in FIG. 10, the elevator door 1 is suspended from a door hanger 2. 27 is a hanger case in which a door rail 28 is formed in a part thereof. A hanger roller 6 is rotatably provided on the door hanger 2. The movement of the upper end of the door 1 is guided when the hanger roller 6 rolls on the upper surface of the door rail 28.
Reference numeral 8 denotes a door shoe provided at the lower end of the door 1. The door 1 is guided to move at the lower end by arranging the door shoe 8 in the groove of the sill 4.

When a pressure is applied to the door 1 in the door device having the above configuration, the door hanger 2 is tilted and the door 1 is deformed as shown in FIG. For this reason, there is a problem that a gap between the door 1 and the vertical frame 29 forming the entrance / exit is widened, and foreign objects are easily drawn. Further, if a force acts in the direction opposite to the direction shown in FIG. 11, the gap between the door 1 and the vertical frame 29 is narrowed or eliminated. For this reason, when the door 1 is opened and closed, the design surface of the door 1 may be damaged or the opening and closing itself may be hindered.

The present invention has been made to solve the above-described problems, and its purpose is an elevator that can appropriately suppress the displacement of the door even when an external force is applied to the door by wind pressure or the like. Is to provide a door device.

An elevator door device according to the present invention includes a door rail provided above an elevator entrance, a door for opening and closing the entrance, a door hanger that suspends the door, and a door hanger that is rotatably provided. The hanger roller that guides the opening and closing of the door, and the steady hanger roller that is provided on the door hanger and rotates while contacting the lower surface of the door rail as it opens and closes. A support body disposed along the door rail, and a displacement restraint device provided on the door hanger for restraining the door from being displaced in the axial direction of the hanger roller, the displacement restraint device opening and closing the door Accordingly, the first guide roller that rotates while contacting one side surface of a part of the support, and the other part of the support according to the opening and closing of the door A second guide roller which rotates while contacting the surface, those having a.

Further, an elevator door device according to the present invention includes a door rail provided above the elevator entrance, a door for opening and closing the entrance, a door hanger for hanging the door, and a door hanger rotatably provided. The hanger roller that guides the opening and closing of the door by rolling the upper surface of the door, the door rail is supported, a part of which is provided on the door hanger, the vertical direction and the hanger roller A displacement suppression device for suppressing the displacement of the door in the axial direction, and the displacement suppression device, as the door is opened and closed, rotates while being in contact with a part of the lower surface of the support, A first guide roller that rotates while contacting one side of a part of the support as the door is opened and closed, and another side of a part of the support as the door is opened and closed A second guide roller which rotates while contacting, those having a.

Further, an elevator door device according to the present invention includes a door rail provided above the elevator entrance, a door for opening and closing the entrance, a door hanger for hanging the door, and a door hanger rotatably provided. A hanger roller that guides the opening and closing of the door by rolling the upper surface of the door, and a hanger roller provided on the door hanger and provided on the door hanger and a steadying roller that rotates while contacting the lower surface of the door rail as the door opens and closes. A displacement suppressing device for suppressing displacement of the door in the axial direction of the roller, the displacement suppressing device rotating with contact with one side surface of the door rail as the door is opened and closed, A second guide roller that rotates while contacting the other side surface of the door rail as the door is opened and closed.

Further, an elevator door device according to the present invention includes a door rail provided above the elevator entrance, a door for opening and closing the entrance, a door hanger for hanging the door, and a door hanger rotatably provided. A hanger roller that guides opening and closing of the door by rolling the upper surface of the door, and a displacement suppression device that is provided on the door hanger and suppresses displacement of the door in the vertical direction and the axial direction of the hanger roller, The displacement suppression device includes a steadying roller that rotates while contacting the lower surface of the door rail when the door is opened and closed, a first guide roller that rotates while contacting one side surface of the door rail when the door is opened and closed, and the door opening and closing Accordingly, a second guide roller that rotates while contacting the other side surface of the door rail is provided.

The elevator door device according to the present invention can appropriately suppress the displacement of the door even when an external force is applied to the door by wind pressure or the like.

It is a front view which shows the door apparatus of the elevator in Embodiment 1 of this invention. It is a perspective view which shows the principal part of the door apparatus of the elevator in Embodiment 1 of this invention. It is a side view which shows the principal part of the door apparatus of the elevator in Embodiment 1 of this invention. It is a perspective view which shows the principal part of the door apparatus of the elevator in Embodiment 2 of this invention. It is a side view which shows the principal part of the door apparatus of the elevator in Embodiment 2 of this invention. It is a perspective view which shows the principal part of the door apparatus of the elevator in Embodiment 3 of this invention. It is a side view which shows the principal part of the door apparatus of the elevator in Embodiment 3 of this invention. It is a perspective view which shows the principal part of the door apparatus of the elevator in Embodiment 4 of this invention. It is a side view which shows the principal part of the door apparatus of the elevator in Embodiment 4 of this invention. It is a side view which shows the door apparatus of the conventional elevator. It is a figure which shows a state when a pressure acts on a door.

In order to explain the present invention in more detail, this will be described with reference to the attached drawings. In addition, in each figure, the same code | symbol is attached | subjected to the part which is the same or it corresponds, The duplication description is simplified or abbreviate | omitted suitably.

Embodiment 1 FIG.
FIG. 1 is a front view showing an elevator door device according to Embodiment 1 of the present invention, FIG. 2 is a perspective view showing an essential part of the elevator door device according to Embodiment 1 of the present invention, and FIG. It is a side view which shows the principal part of the door apparatus of the elevator in the form 1.

In FIGS. 1 to 3, 1 is a door for opening and closing the entrance of the elevator, and 2 is a door hanger provided above the upper end of the door 1. The door 1 is suspended from the door hanger 2. The door 1 moves in the width direction and opens and closes the doorway. FIG. 1 shows an example of a double-opening type door device in which the door 1 moves to both sides to open and close the doorway.

The opening and closing movement of the door 1 is guided by the door rail 3 and the sill 4.
The door rail 3 is supported by a support body 5 fixed to a predetermined fixed body. The support body 5 consists of a girder and a hanger case, for example, is fixed to a hoistway wall or a hoistway beam. The door rail 3 is arranged horizontally in the frontage direction above the entrance of the elevator.

The door hanger 2 is provided with a pair of hanger rollers 6 and a pair of steadying rollers 7 so as to be rotatable in both directions.
The hanger roller 6 has a horizontal axis in a direction orthogonal to the opening / closing direction of the door 1. That is, the axis of the hanger roller 6 is also orthogonal to the longitudinal direction of the door rail 3. The hanger roller 6 is placed on the door rail 3 and guides opening and closing of the door 1 by rolling on the upper surface of the door rail 3.

The steady rest roller 7 is provided to prevent the door 1 from being displaced in the vertical direction. The steadying roller 7 has a horizontal axis parallel to the axis of the hanger roller 6. The steadying roller 7 is arranged so that the upper end of the outer peripheral surface thereof contacts the door rail 3 from below. For this reason, when the door 1 is opened and closed, the steadying roller 7 rotates while contacting the lower surface of the door rail 3. That is, the steadying roller 7 sandwiches the door rail 3 from above and below with the hanger roller 6 to prevent the door 1 from shaking.

The threshold 4 is for guiding the movement of the lower end of the door 1. A groove is formed in the threshold 4 in the opening / closing direction of the door 1. The door 1 is provided with a door shoe 8 (not shown in FIGS. 1 to 3) protruding downward at the lower end portion thereof. By disposing the door shoe 8 (a part thereof) inside the groove of the sill 4, the movement of the lower end portion of the door 1 is guided. The door shoe 8 is provided on both sides of the door 1.

Reference numeral 9 denotes a displacement suppressing device provided on one side and the other side of the door hanger 2. The displacement suppressing device 9 is for suppressing the displacement of the door 1 in the axial direction of the hanger roller 6. The displacement suppression device 9 is disposed at the lower part of the door hanger 2, that is, at a position close to the door 1.
Below, with reference to FIG.2 and FIG.3, each detail of the displacement suppression apparatus 9 and the said support body 5 relevant to this displacement suppression apparatus 9 is demonstrated.

The support body 5 has, for example, an L shape in a side view, and the door rail 3 is provided on one side surface of one plate-like member 5a arranged vertically. The plate-like member 5 a is disposed in parallel to the door rail 3. For this reason, the lower end portion of the plate-like member 5 a is also disposed horizontally along the door rail 3.

The main part of the displacement suppression device 9 is constituted by the support member 10 and the pair of

guide rollers

11 and 12.
The support member 10 is made of a plate material bent into an L shape, for example. The support member 10 has one side of the L shape arranged in the vertical direction and is fixed to the side end surface of the door hanger 2. The other side of the L-shape of the support member 10 is arranged horizontally just below the lower end of the plate-like member 5a.

The

guide rollers

11 and 12 are provided on the other side of the support member 10 so as to be rotatable in both directions. Each of the

guide rollers

11 and 12 has an axis in the vertical direction. One guide roller 11 is disposed such that the outer peripheral surface thereof is in line contact with one side surface of the plate-like member 5a. For this reason, when the door 1 opens and closes, the guide roller 11 rotates while contacting one side surface of the plate-like member 5a. The other guide roller 12 is arranged so that the outer peripheral surface thereof is in line contact with the back surface of the one side surface of the plate-like member 5a. For this reason, when the door 1 opens and closes, the guide roller 12 rotates while contacting the other side surface (the back surface) of the plate-like member 5a. That is, the

guide rollers

11 and 12 sandwich the lower end portion of the plate-like member 5a from the front and back, and suppress the displacement of the door 1 in the user's exit / entry direction (coincident with the axial direction of the hanger roller 6).

If it is a door apparatus which has the said structure, even if it is a case where a horizontal external force acts on the side surface of the door 1 by a wind pressure etc., the displacement of the door 1 can be suppressed appropriately.
That is, the door device is provided with a pair of

guide rollers

11 and 12 having a shaft in the vertical direction so as to sandwich the lower end portion of the plate-like member 5a from the front and back. For this reason, even when a horizontal external force acts on the side surface of the door 1, the external force can be received by the plate-like member 5 a, and the door hanger 2 does not tilt. For this reason, the door 1 is not deformed.

The

guide rollers

11 and 12 are in contact with the lower end portion of the plate-like member 5a with a line (or a surface having a slight width). Further, the displacement suppressing device 9 having the

guide rollers

11 and 12 is provided on both sides of the door hanger 2 and at a position close to the door 1. For this reason, even if an excessive external force acts on the door 1, the door 1 will not be bent as shown in FIG.

Furthermore, since the horizontal external force acting on the door 1 is received via the

guide rollers

11 and 12, even when the external force is acting on the door 1, there is no hindrance to the opening and closing of the door 1. Further, the external force can be stably received by the

guide rollers

11 and 12, and there is no possibility that an abnormal noise is generated when the door 1 is opened or closed or the running resistance of the door 1 is increased.

Embodiment 2. FIG.
4 is a perspective view showing the main part of an elevator door device according to Embodiment 2 of the present invention, and FIG. 5 is a side view showing the main part of the elevator door device according to Embodiment 2 of the present invention.

4 and 5, reference numeral 13 denotes a displacement suppressing device provided on one side and the other side of the door hanger 2. The displacement suppression device 13 is for suppressing the displacement of the door 1 in the axial direction of the hanger roller 6. In the present embodiment, the displacement suppression device 13 suppresses the displacement of the door 1 using the door rail 3 instead of the support body 5. For this reason, the displacement suppression device 13 is disposed at a position close to the door rail 3.

The displacement suppression device 13 is configured by a support member 14 and a pair of

guide rollers

15 and 16.
The support member 14 is made of, for example, a plate material bent into an L shape. The support member 14 is arranged on one side of the L shape in the vertical direction and is fixed to the side end surface of the door hanger 2. The other side of the L-shape of the support member 14 is horizontally disposed slightly below the door rail 3.

The

guide rollers

15 and 16 are provided on the other side of the support member 14 so as to be rotatable in both directions. The

guide rollers

15 and 16 each have an axis in the vertical direction. One guide roller 15 is arranged such that the outer peripheral surface thereof is in line contact with one side surface of the door rail 3. For this reason, when the door 1 opens and closes, the guide roller 15 rotates while contacting one side surface of the door rail 3. The other guide roller 16 is arranged such that the outer peripheral surface thereof is in line contact with the back surface of the one side surface of the door rail 3. For this reason, when the door 1 opens and closes, the guide roller 16 rotates while contacting the other side surface (the back surface) of the door rail 3. That is, the

guide rollers

15 and 16 sandwich the lower end portion of the door rail 3 from the front and back sides thereof, and suppress the displacement of the door 1 in the user entry / exit direction (coincident with the axial direction of the hanger roller 6).

Others have the same configuration as in the first embodiment.

Even with the configuration shown in the present embodiment, the same effects as in the first embodiment can be obtained. Moreover, if it is the said structure, the displacement of the door 1 can be suppressed appropriately by the displacement suppression apparatus 13, without being influenced by arrangement | positioning and shape of the support body 5. FIG. The positional relationship between the door rail 3 and the support 5 may deviate from the design value due to manufacturing and installation errors. With this configuration, it is possible to reliably prevent the

guide rollers

15 and 16 from idling due to the dimensional error and the rolling resistance of the

guide rollers

15 and 16 from increasing.

Embodiment 3 FIG.
6 is a perspective view showing an essential part of an elevator door device according to Embodiment 3 of the present invention, and FIG. 7 is a side view showing an essential part of an elevator door device according to Embodiment 3 of the present invention.

As shown in FIGS. 6 and 7, the door hanger 2 is provided with a pair of hanger rollers 6, but is not provided with the steady roller 7. In the present embodiment, the function of the steady roller 7 is provided in the displacement suppression device 17.

The displacement suppression device 17 is provided on one side and the other side of the door hanger 2. The displacement suppression device 17 has a function of suppressing the displacement of the door 1 in the vertical direction in addition to the function of suppressing the displacement of the door 1 in the axial direction of the hanger roller 6. In the present embodiment, the displacement suppression device 17 uses the support 5 to suppress the displacement of the door 1. For this reason, the displacement suppression device 17 is disposed at a position close to the support 5.

The displacement suppression device 17 includes a support member 18, a steady roller 19, and a pair of

guide rollers

20 and 21.
The support member 18 is made of, for example, a block material having a U shape in plan view. One side surface of the support member 18 is fixed to the side end surface of the door hanger 2. The main part of the support member 18 is disposed below the plate-like member 5a.

The steadying roller 19 has a horizontal axis parallel to the axis of the hanger roller 6. The steady roller 19 is disposed such that the upper end of the outer peripheral surface thereof contacts the plate-like member 5a of the support 5 from below. For this reason, when the door 1 is opened and closed, the steadying roller 19 rotates while contacting the lower end surface of the plate-like member 5a. In other words, the steadying roller 19 sandwiches an integrated object composed of the door rail 3 and the plate-like member 5a from above and below with the hanger roller 6, and prevents the door 1 from shaking.

The

guide rollers

20 and 21 are provided on the upper surface of the support member 18 so as to be rotatable in both directions. The

guide rollers

20 and 21 each have an axis in the vertical direction. One guide roller 20 is disposed such that the outer peripheral surface thereof is in line contact with one side surface of the plate-like member 5a. For this reason, when the door 1 opens and closes, the guide roller 20 rotates while contacting one side surface of the plate-like member 5a. The other guide roller 21 is arranged so that the outer peripheral surface thereof is in line contact with the back surface of the one side surface of the plate-like member 5a. For this reason, when the door 1 opens and closes, the guide roller 21 rotates while contacting the other side surface (the back surface) of the plate-like member 5a. That is, the

guide rollers

20 and 21 sandwich the lower end portion of the plate-like member 5a from the front and back, and suppress the displacement of the door 1 in the user's exit / entry direction (coincident with the axial direction of the hanger roller 6).

Others have the same configuration as in the first embodiment.

Even with the configuration shown in the present embodiment, the same effects as in the first embodiment can be obtained. Moreover, if it is the said structure, it can apply also to the door apparatus by which the steady hanger roller 7 is not provided in the door hanger 2. FIG. Furthermore, since the steadying roller 19 is integrally formed in the displacement suppressing device 17, the manufacturing cost can be reduced.

Embodiment 4 FIG.
FIG. 8 is a perspective view showing an essential part of an elevator door apparatus according to Embodiment 4 of the present invention, and FIG. 9 is a side view showing an essential part of the elevator door apparatus according to Embodiment 4 of the present invention.

8 and 9, reference numeral 22 denotes a displacement suppressing device provided on one side and the other side of the door hanger 2. Also in the present embodiment, the door hanger 2 is not provided with the steadying roller 7. The function of the steadying roller 7 is provided in the displacement suppressing device 22. The displacement suppression device 22 is for suppressing the displacement of the door 1 in the vertical direction and the axial direction of the hanger roller 6. The displacement suppression device 22 suppresses the displacement of the door 1 using the door rail 3 instead of the support body 5. For this reason, the displacement suppression device 22 is disposed at a position close to the door rail 3.

The displacement suppression device 22 is configured by a support member 23, a steadying roller 24, and a pair of

guide rollers

25 and 26.
The support member 23 is made of, for example, a block material having a U shape in plan view. One side surface of the support member 23 is fixed to the side end surface of the door hanger 2. The main part of the support member 23 is arranged below the door rail 3.

The steadying roller 24 has a horizontal axis parallel to the axis of the hanger roller 6. The steadying roller 24 is disposed such that the upper end of the outer peripheral surface thereof is in contact with the door rail 3 from below. For this reason, when the door 1 opens and closes, the steadying roller 24 rotates while contacting the lower surface of the door rail 3. That is, the steadying roller 24 sandwiches the door rail 3 from above and below by the hanger roller 6 and prevents the door 1 from shaking.

The

guide rollers

25 and 26 are provided on the upper surface of the support member 23 so as to be rotatable in both directions. The

guide rollers

25 and 26 each have an axis in the vertical direction. One guide roller 25 is arranged such that the outer peripheral surface thereof is in line contact with one side surface of the door rail 3. For this reason, when the door 1 opens and closes, the guide roller 25 rotates while contacting one side surface of the door rail 3. The other guide roller 26 is disposed such that the outer peripheral surface thereof is in line contact with the back surface of the one side surface of the door rail 3. For this reason, when the door 1 opens and closes, the guide roller 26 rotates while contacting the other side surface (the back surface) of the door rail 3. That is, the

guide rollers

25 and 26 sandwich the lower end portion of the door rail 3 from the front and back sides thereof, and suppress the displacement of the door 1 in the user exit / entry direction (coincident with the axial direction of the hanger roller 6).

The rest of the configuration is the same as that of the first embodiment.
If it is the structure shown in this Embodiment, it is possible to show each effect shown in Embodiment 1 thru | or 3.

The elevator door device according to the present invention is installed at an elevator hall or a car. The door device is particularly suitable for an elevator car in which indoor pressure control is performed, an elevator hall installed in a tunnel, and the like.

DESCRIPTION OF SYMBOLS 1 Door 2

Door hanger

3, 28 Door rail 4 Sill 5 Support body 5a Plate-shaped member 6

Hanger roller

7, 19, 24 Stabilizing roller 8

Door shoe

9, 13, 17, 22

Displacement suppression apparatus

10, 14, 18, 23

Support member

11, 12, 15, 16, 20, 21, 25, 26 Guide roller 27 Hanger case 29 Vertical frame

Claims

A door rail provided above the elevator doorway,
A door for opening and closing the doorway;
A door hanger for hanging the door;
A hanger roller that is rotatably provided on the door hanger and guides opening and closing of the door by rolling the upper surface of the door rail.
An anti-sway roller provided on the door hanger and rotating in contact with the lower surface of the door rail as the door is opened and closed;
Supporting the door rail, a part of which is disposed along the door rail; and
A displacement suppressing device provided on the door hanger, for suppressing the displacement of the door in the axial direction of the hanger roller;
With
The displacement suppression device is
A first guide roller that rotates in contact with one side surface of the part of the support as the door is opened and closed;
A second guide roller that rotates while being in contact with the other side surface of the part of the support as the door is opened and closed;
Elevator door device with.
A door rail provided above the elevator doorway,
A door for opening and closing the doorway;
A door hanger for hanging the door;
A hanger roller that is rotatably provided on the door hanger and guides opening and closing of the door by rolling the upper surface of the door rail.
Supporting the door rail, a part of which is disposed along the door rail; and
A displacement restraint device provided on the door hanger, for restraining the door from being displaced in the vertical direction and the axial direction of the hanger roller;
With
The displacement suppression device is
With the opening and closing of the door, a steadying roller that rotates while contacting the lower surface of the part of the support,
A first guide roller that rotates in contact with one side surface of the part of the support as the door is opened and closed;
A second guide roller that rotates while being in contact with the other side surface of the part of the support as the door is opened and closed;
Elevator door device with.
A door rail provided above the elevator doorway,
A door for opening and closing the doorway;
A door hanger for hanging the door;
A hanger roller that is rotatably provided on the door hanger and guides opening and closing of the door by rolling the upper surface of the door rail.
An anti-sway roller provided on the door hanger and rotating in contact with the lower surface of the door rail as the door is opened and closed;
A displacement suppressing device provided on the door hanger, for suppressing the displacement of the door in the axial direction of the hanger roller;
With
The displacement suppression device is
A first guide roller that rotates while contacting one side of the door rail as the door opens and closes;
A second guide roller that rotates while contacting the other side of the door rail as the door opens and closes;
Elevator door device with.
A door rail provided above the elevator doorway,
A door for opening and closing the doorway;
A door hanger for hanging the door;
A hanger roller that is rotatably provided on the door hanger and guides opening and closing of the door by rolling the upper surface of the door rail.
A displacement restraint device provided on the door hanger, for restraining the door from being displaced in the vertical direction and the axial direction of the hanger roller;
With
The displacement suppression device is
With the opening and closing of the door, a steadying roller that rotates while contacting the lower surface of the door rail,
A first guide roller that rotates while contacting one side of the door rail as the door opens and closes;
A second guide roller that rotates while contacting the other side of the door rail as the door opens and closes;
Elevator door device with.
The displacement suppression device is
A support member fixed to the door hanger;
Further comprising
The elevator door device according to claim 4, wherein the steadying roller, the first guide roller, and the second guide roller are rotatably provided on the support member.
The support has a plate-like member in which the door rail is fixed to a side surface,
The elevator door device according to claim 1 or 2, wherein the displacement suppression device suppresses displacement of the door by bringing each roller into contact with a lower end portion of the plate-like member arranged along the door rail.
The elevator door device according to any one of claims 1 to 4, wherein the displacement suppression device is provided on each side of the door hanger.