JP2572456B2 - Door safety device - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a door safety device for an electric door provided in an elevator or the like.

[Conventional technology]

Conventionally, as a door safety device, for example, a device disclosed in Japanese Patent Application Laid-Open No. 60-6580 has been proposed. In such a conventional door safety device, a connecting support is provided between an operating piece and a lever, and the operating piece is attached to the connecting support so as to be rotatable in a horizontal plane, and the connecting support and the lever are provided. Is movably mounted in the opening and closing direction of the door. Here, when the operating piece receives an external force and rotates in a horizontal plane when the door is closed, the rotation detection switch outputs a command signal for reversing the electric motor, and
The rotated operating piece is returned by the return means to the predetermined original position when there is no external force. The return means is built in the operation one side, and is provided on a pressing force applying means such as a spring or a rod, and is provided on the connection support body side,
It is composed of a receiving plate having a concave curved surface to which the pressing force is applied by the pressing force applying means. In the door safety device configured as described above, when a bogie, forklift, luggage, or the like collides with the operating piece, the operating piece moves or rotates, so that the door or the door safety device itself is damaged. Accidents are prevented.

[Problems to be solved by the invention]

By the way, in the conventional door safety device described above, when the operating piece is largely rotated by an external force and collides with the door, there is a concern that the spring or rod of the pressing force applying device built in the operating piece may be deformed or damaged. Atsuta. When the spring or the rod is damaged in this manner, there is a problem that the operating piece cannot return to the predetermined original position from the turning position, that is, the door cannot be closed, so that the elevator cannot be moved up and down.

The present invention has been made in view of such circumstances in the related art, and has as its object to prevent damage to the pressing force applying device even when the operating piece rotates and collides with the door. It is to provide a door safety device that can be used.

[Means for solving the problem]

In order to achieve this object, the present invention provides an operating piece that is provided at a side end of a door driven to be opened and closed by an electric motor in a direction in which the door closes, and is relatively movable in the door opening and closing direction. This operating piece is connected to the door via a lever,
A connection support that rotatably supports the operating piece in a horizontal plane, a movement detection switch that outputs a command signal in accordance with the relative movement of the operating piece, and a command signal in accordance with the rotation of the operating piece. A rotation detection switch for outputting, and a return means for returning the operating piece from the rotation position to a predetermined original position, and when the door is closed, the motor is reversed by the command signal to open the door. In door safety devices,
The return means is provided on the connection support and includes a pressing force applying device for applying a pressing force to the operating piece, and a receiving plate fixed to the operating piece and having a concave curved surface receiving the pressing force. I have.

[Action]

As described above, the present invention receives the pressing force applied by the pressing force applying device provided on the connecting support on the concave curved surface of the receiving plate fixed to the operating piece, so that the operating piece is at a predetermined original position. When it is rotated from above, a return force acts on the operating piece via the concave curved surface of the receiving plate, and the operating piece is returned to the original position by the returning force. As described above, the pressing force applying device is provided on the connecting support, and is not built in the operating piece. Therefore, even if this operating piece relatively rotates and collides with the door, the pressing force applying device is not used. Damage can be prevented.

Embodiment An embodiment of the door safety device of the present invention will be described below with reference to the drawings.

1 to 7 are explanatory views showing an embodiment of a door safety device of the present invention. FIG. 1 is a cross-sectional view showing a main part configuration, and FIG. 2 is a view explaining an external force acting on an operation piece. 3, FIG. 3 is a front view showing the entire structure, FIG. 4 is an enlarged front view near the connecting support, FIG. 5 is a cross-sectional view near the connecting support, and FIG. 6 is a cross-sectional view near the rotation detecting switch. FIG. 7 is a view for explaining the principle that the operating piece returns. FIG. 1 is a cross-sectional view of FIG.
FIG. 4 is an enlarged front view corresponding to the IV part of FIG. 3, FIG. 5 is a cross-sectional view taken along the line VV of FIG. 4, and FIG. 6 is a cross-sectional view of FIG. FIG. 6 is a cross-sectional view along the line VI-VI.

As shown in FIG. 3, the door safety device of the present invention is provided at a side end of the door 1 so as to protrude in a direction in which the door 1 closes, and an operation piece 2 which is relatively movable in the opening and closing direction of the door 1. The connecting pieces 8 and 8a which connect the operating piece 2 to the upper seat 3 and the lower seat 4 of the door 1 via a pair of levers 5 and 5a, respectively, and which rotatably support the operating piece 2 in a horizontal plane. And a movement detection switch 6 attached to the lower seat 4 and detecting the rotation of the lever 5a, that is, the relative movement of the operation piece 2, and outputting a command signal. It has a rotation detection switch 9 for outputting a command signal in accordance with the rotation, and return means 10 and 10a for returning the operation piece 2 from the rotation position to a predetermined original position. One return means 10 is the first
As shown in the figure, a pressing force applying device 15 provided on the connecting support 8 for applying a pressing force to the operating piece 2 and a receiving member fixed to the operating piece 2 and having a concave curved surface 14a receiving the above pressing force. Board 1
It consists of four. The above-described pressing force applying device 15 includes a fixing portion 15a fixed to the connecting support 8, a spring 16 having one end supported by the fixing portion 15a, and a spring seat 17 to which the other end of the spring 16 is pressed. The spring seat 17 is attached to an intermediate portion, and is provided with a rod 18 which is provided so as to be movable in the horizontal direction along the connecting support member 8, and is rotatably supported by one end of the rod 18.
The roller 19 is configured to roll on the concave curved surface 14a of the receiving plate 14. The other return means 10a has the same configuration.

As shown in FIG. 4, a fitting piece 12 is attached to the rear end of the operating piece 2 and a fulcrum pin 11 fitted to the fitting piece 12 is provided.
And the fulcrum pin 11 is
12 is fitted, the operating piece 2 becomes the arrow 2 in FIG.
It is rotatably supported in directions indicated by reference numerals 1 and 22, that is, in a horizontal plane. As shown in FIG. 6, a rotation detecting switch 9 for detecting the rotation of the operation piece 2 is built in the connecting support 8a. This rotation detection switch 9 is an actuator 9a
And comes into contact with a chevron-shaped operating body 13 fastened to the rear end of the operating piece 2 via the actuator 9a. When the operating piece 2 is in the normal position as shown in FIG. 6, the actuator 9a is pressed by the top 13a of the operating body 13, so that the rotation detecting switch 9 does not output a command signal. On the other hand, when the operating piece 2 rotates about the fulcrum pin 11 in FIG. 5, that is, about the rotation center C in FIG. 6, the actuator 9a contacts the side surface 13b of the operating body 13, and as a result, the actuator 9a moves to the operation piece 2 side, and the rotation detection switch 9
Outputs a command signal. In response to this command signal, when the door 1 is closed, the electric motor (not shown) is turned over to open the door 1.

In this embodiment, when a passenger or luggage gets into or out of a car, these objects collide with the operating piece 2 and exert an external force on the operating piece 2 from the side, for example, an external force shown in FIG. When B ₁ is working, operating piece 2 is rotated about the fulcrum pin 11 in the direction indicated by the arrow 21 in Figure 5. Thereby, the operation piece 2 reaches the rotation position shown in FIG. At this time, the arc radius R of the concave curved surface 14a is set so that the rolling element 19 is moved to the left in FIG. 7 with the rotation of the receiving plate 14, so that the rolling element 14 The distance l to the center is reduced and the rod 18 is pushed in against the spring 16. Together with the pressing force P of the concave surface 14a of the spring 16 increases Te cowpea the compression of the spring 16 itself, a component force F ₁ for pressing the receiving plate 14 at the contact point between the rolling elements 19 and the concave curved surface 14a, the receiving plate 14 work and the component force F ₂ to try to rotate about the rotation center C. Yotsute This component force F _2, operating piece 2 is rotated to the original position shown in FIG. 1 from the rotational position shown in FIG. 7, that is, return to the state of normal. Incidentally, the return force F ₃ exerted on the tip of the operating piece 2, and the distance l rotation center C and the rolling element 19, the rotation center C operating piece 2
For is determined by converting the component of force F ₂ by a distance L ₁ to the tip, the size of the door 1, according to the size of the operating pieces 2, the arc of the spring force and the concave curved surface 14a of the spring 16 The diameter R is set to an appropriate one.

In the embodiment configured as described above, since the pressing force applying device 15 is provided on the connecting support 8 and is not built in the operating piece 2, the operating piece 2 pivots relatively large and collides with the door 1. However, the pressing force applying device 15 is not damaged. A rolling element 19 that can roll on the concave curved surface 14a at one end of the rod 18.
Is attached, the frictional force generated between the rod 18 and the concave curved surface 14a can be reduced, so that a larger pressing force can be applied to the concave curved surface 14a than when the rod 18 directly contacts the concave curved surface 14a, and the rod 18 Of the concave curved surface 14a can be prevented.

In this embodiment, the shape of the receiving plate 14 is the concave curved surface 14a having an arc diameter R smaller than the distance L. However, the present invention is not limited to this, and the contacting point of the rolling element 19 on the receiving plate 14 The distance to the rotation center C may be replaced with any one of a concave curved surface, a flat surface, and a convex curve that gradually increases as the operation piece 2 rotates.

〔The invention's effect〕

Since the present invention is configured as described above, it is possible to prevent the pressing force applying device from being damaged due to the collision of the operating piece with the door, and therefore, it is possible to reliably return the operating piece to the original position and close the door. There is an effect that it is possible to prevent the elevator from being unable to move up and down due to the door closing failure.

[Brief description of the drawings]

1 to 7 are views for explaining an embodiment of a door safety device according to the present invention. FIG. 1 is a cross-sectional view showing a main part configuration, and FIG.
FIG. 3 is a cross-sectional view showing the external force acting on the operation piece, FIG. 3 is a front view showing the entire configuration, FIG. 4 is an enlarged front view showing the vicinity of the connecting support, FIG. FIG. 6 is a cross-sectional view of the vicinity of the rotation detecting switch, and FIG. 7 is a cross-sectional view for explaining the principle of returning the operating piece. DESCRIPTION OF SYMBOLS 1 ... Door, 2 ... Operating piece, 5, 5a ... Lever, 6 ... Movement detection switch, 8, 8a ... Connection support, 9 ... Rotation detection switch, 10, 10a ... Returning means, 14 ......... 14a
…… Concave curved surface, 15 …… Pressing force applying device, 16 …… Spring, 18…
... Rod, 19 ... Rolling element.

Claims (1)

(57) [Claims] An operating piece which is provided at a side end of a door driven to be opened and closed by an electric motor in a direction in which the door is closed, and which is relatively movable in the opening and closing direction of the door, is connected to the operating piece via a lever. A connection supporting member that is connected to the door and rotatably supports the operation piece in a horizontal plane, a movement detection switch that outputs a command signal in accordance with the relative movement of the operation piece, and a horizontal plane of the operation piece. A rotation detection switch that outputs a command signal in response to rotation within the device, and a return unit that returns the operating piece from the rotation position to a predetermined original position,
In the door safety device for opening the door by reversing the electric motor by the command signal when the door closes, the return means is provided on the connection support and applies a pressing force to the operating piece. And a receiving plate fixed to the operating piece and having a concave curved surface receiving the pressing force.