JPH058311Y2 - - Google Patents

Description

[Detailed Description of the Invention] <Industrial Application Field> The present invention relates to a door safety device used for doors whose opening/closing valves are controlled by electric motors, such as elevator doors.

<Prior Art> Doors whose opening and closing are controlled by electric motors, such as elevator doors, are sometimes equipped with a door safety device for the safety of passengers.

This type of door safety device is proposed in Japanese Patent Application Laid-Open No. 60-6580, and FIGS. 7 and 8 are a front view and a partially cutaway view showing the configuration of the main parts of the door safety device according to this proposal. It is.

As shown in FIG. 7, an upper seat 3 is fixed above the surface of the door 1, and a lower seat 4 is fixed below the surface of the door 1, and one end of a lever 5 is rotatably attached to the upper seat 3 and the lower seat 4, respectively. A connecting body 8 is attached to the other end of each of these levers 5.

The actuating pieces 2 are attached to these connecting bodies 8 as shown in FIG.

That is, a fitting piece 22 is formed on the side edge of the actuating piece 2, a fitting hole 22A is provided in the fitting piece 22, and the fulcrum pin 11 is fixed to the side edge of the connecting body 8.
Both ends of the actuating piece 2 are inserted and fitted into the aforementioned fitting holes 22A, and the actuating piece 2 is attached to the connecting body 8 so as to be rotatable about the fulcrum pin 11 as a support shaft.

Further, as shown in FIG. 7, a first switch 6 is fixed to the lower seat 4, and this first switch 6 is activated by the rotation of the lever 5 mentioned above to issue a command signal. A signal is given to an electric motor (not shown) from a signal line 7, and the electric motor is reversed in response to this command signal to open the door 1.

Furthermore, a second switch 9 is attached to the lower connecting body 8.
is incorporated, and this second switch 9 detects the rotation of the actuating piece 2 with the fulcrum pin 11 as the rotational axis and operates to issue a command signal, and this command signal is transmitted to the signal line 7.
This command signal is applied to an electric motor (not shown), and the electric motor is reversed to open the door 1.

A return mechanism 10 is provided on the lower and upper connecting bodies 8, and the operating piece 2, which has been rotated about the fulcrum pin 11 as a support shaft, is returned to its original position by the return mechanism 10. .

In the door safety device proposed with such a configuration,
For example, when applied to an elevator,
After the car has landed on the floor and the door 1 has been opened, a predetermined period of time has elapsed, and while the door 1 is being closed, a passenger or luggage comes into contact with the actuating piece 2, and the actuating piece 2 moves in the direction of the arrow X in Fig. 7. When pushed in, the first switch 6 is activated, the electric motor is reversed, and the door 1, which was about to close, is opened.

Similarly, when the actuating piece 2 is rotated about the fulcrum pin 11 by passengers or luggage during the process of closing the door 1, the second switch 9 is activated and the electric motor is reversed, causing the door to close. Door 1, which was previously closed, opens.

When the actuating piece 2 moves away from the passenger or the luggage, the movement of the actuating piece 2 in the direction of the arrow X in Fig. 7 is as follows.
The actuating piece 2 is returned to its original position by the elastic return force, and the rotation of the actuating piece 2 about the fulcrum pin 11 is caused by the return mechanism 10.
It returns to its original position.

In this way, according to the proposed door safety device, the door is opened by detecting that a passenger or baggage is caught in the door while it is being closed, thereby making it possible to prevent accidents from occurring.

<Problems to be solved by the invention> In the door safety device according to the above proposal, the seventh
As shown in FIG. 8, the fulcrum pin 11 and the fitting hole 2 are connected to the second switch 9 and the return mechanism 10.
The rotation mechanism formed by 2A has a cantilevered structure.

For this reason, a force is constantly applied to the fulcrum pin 11 in a direction to eccentrically center the axis due to the reaction force from the return mechanism 10.

This reaction force from the return mechanism 10 causes eccentricity in the fulcrum pin 11 due to displacement of the fitting piece 22 and wear of the fitting hole 22A serving as a bearing, and the return mechanism 1
0, the return force is insufficient and the actuating piece 2 cannot return to its original position, or the second switch 9 is unable to return to its original position, making it impossible to close the door 1, causing the elevator to close. sometimes became unusable.

The present invention was developed in view of the current state of this type of door safety device as described above, and its purpose is to prevent the door from becoming unable to return to its original position or to close the door. An object of the present invention is to provide a door safety device that always operates normally and performs highly reliable operation.

<Means for solving the problem> In order to achieve the above-mentioned object, in the present invention, a door is provided protrudingly at the tip of a door that is driven to open and close by an electric motor, is movable in the opening and closing direction of the door, and is movable in the opening and closing direction of the door. an actuating piece that is rotatable around a support shaft parallel to the surface;
a coupling body provided on the opposite side to the protruding direction of the actuation piece and forming a rotation mechanism between the actuation piece and the actuation piece for rotating the actuation piece around the support shaft; a lever that is attached and moves in the opening/closing direction of the door together with the actuating piece and holds the connecting body against the door; a first switch that is actuated by rotation of the lever and reverses the electric motor; a second switch that is actuated by rotation of the actuation piece about the support shaft and reverses the electric motor; and a return mechanism that returns the actuation piece from the rotation position about the support shaft to its original position. In the door safety device, the rotation mechanism is provided at a position sandwiching the return mechanism.

<Function> In the present invention, rotating mechanisms formed between the actuating piece and the connecting body and rotating the actuating piece about a support shaft parallel to the surface of the door are provided at positions sandwiching the return mechanism.

In this way, since the rotating mechanism has a double-supported structure, in the present invention, the reaction force from the return mechanism is used to support the rotating mechanism, which is composed of, for example, the support shaft on the coupling body side and the bearing on the operating side. No more force is applied in the direction that makes the shaft eccentric.

Therefore, the actuating piece will not be unable to return or the second switch will not be able to return due to the reaction force from the return mechanism due to eccentricity of the rotation mechanism, and highly reliable operation is achieved. .

<Example> Hereinafter, an example of the present invention will be described in detail using FIGS. 1 to 6.

Here, FIGS. 1 to 6 are diagrams showing the configuration of an embodiment of the present invention, with FIG. 1 being a front view, FIG. 2 being a partially cutaway view showing the configuration of the main parts, and FIG. V- in Figure 2
V cross-sectional view, Figure 4 is the A-A cross-sectional view of Figure 2, and Figure 5 is
The figure is a sectional view taken along the line BB in FIG. 2, and FIG. 6 is an explanatory diagram showing the configuration of the return mechanism.

As shown in FIG. 1, in the embodiment of the present invention, the connecting body 8 attached to the upper seat 3 via the lever 5 and the connecting body 8 attached to the lower seat 4 via the lever 5 both have a return mechanism. It is attached to the actuating piece 2 at a position sandwiching the actuating member 10 from above and below, thereby forming a rotating mechanism.

FIGS. 2 and 3 show this rotating mechanism part in detail. In the embodiment of the present invention, the support shaft 20 is moved toward both ends of the connecting body 8 toward each other.
are formed to protrude and have the same axis a.

For this connecting body 8, it has already been shown in FIGS. 7 and 8.
As explained in the proposed door safety device using the figures, the lever 5 is attached.

On the other hand, bearings 21 are formed in the fitting pieces 22 provided on the side edges of the actuating piece 2 at positions that sandwich the return mechanism 10 from above and below, and these bearings 21 are connected to the above-mentioned support shaft 20. They are rotatably fitted.

Here, the return mechanism 10 has a configuration as shown in FIGS. 4 and 6, and a receiving plate 14 having an arcuate rolling surface is fixed to the connecting body 8.
A rod 18 is disposed opposite to the receiving plate 14 and has a rolling element 19 attached to its tip that rolls on a rolling surface.

A holder 15 is fixed inside the actuating piece 2, and a return spring 16 is held in this holder 15.
The rod 18 having the spring seat 17 is the return spring 16
The rolling element 19 is attached to the actuating piece 2 in a state where it is pressed against the sliding surface of the receiving plate 14 by the biasing force.

In addition, as shown in FIG. 6, the arc diameter R of the receiving plate 14 is the same as the radius
The distance L between the sliding surface of No. 4 and the axis a, which is the center of rotation of the actuating piece 2, is set smaller than the distance L between the sliding surface of No. 4 and the center of rotation of the actuating piece 2.

Therefore, when the rod 18 rotates due to the rolling motion of the rolling element 19 on the rolling surface, l<L, and the rod 18 resists the biasing force of the return spring 16 and pushes against the actuating piece 2.
It seems to be pushed inside.

When the rod 18 is pushed into the actuating piece 2 in this way, the spring force P pressing the rod 18 against the rolling surface of the receiving plate 14 increases.

From this spring force P, the force F ₁ of the rolling element 19 pressing against the receiving plate at the contact point between the rolling element 19 and the rolling surface,
The structure is such that the force _F2 for rotating the rod 18 about the axis a is obtained as a component force.

The second switch 9 is constructed as shown in FIG. 5, and the second switch 9 is attached to the connecting body 8. An actuator 9a is provided protruding from the tip of the second switch 9. It is being

The actuator 9a is attached to the actuating piece 2.
A chevron-shaped operating body 13 is provided opposite to the operating body 13, and the top portion 13a of this operating body 13 faces the actuator 9a, and the actuator 9a is normally in a pressed state.

Therefore, when the actuating piece 2 rotates around the axis a, the actuator 9a moves from the side surface 13 of the operating body 13.
It protrudes toward the actuating piece 2 along the line b, whereby the second switch 9 is actuated.

The operation of the embodiment of the present invention having such a configuration will be described with reference to the case where the present invention is applied to an elevator.

When the elevator car reaches the floor, the elevator door 1 is opened for a predetermined period of time, and the electric motor is activated to close the door 1, a passenger or luggage comes into contact with the operating piece 2 and the elevator is activated. When the piece 2 is moved in the direction of the arrow X in FIG.

As a result, the electric motor reverses and opens the door 1, which was about to close, thereby releasing the passenger or luggage from being caught in the door 1, thereby preventing an accident from occurring.

In addition, while the door 1 is closed, the actuating piece 2
When a passenger or baggage comes into contact with the actuator 2 and the actuator 2 rotates in the direction of the arrow in FIG. , the second switch 9 is activated and a command signal is given to the electric motor via the signal line 7.

For this reason, the electric motor reverses and opens the door 1, which was about to close, so that in this case as well, the passenger or luggage is released from being caught by the door 1, and an accident is prevented from occurring.

Furthermore, in this case, the actuating piece 2 in FIG.
rotates around the axis a, the rolling elements 19 roll on the rolling surface of the receiving plate 14, and the axis a in the equilibrium state
The rod 18 is pushed into the actuating piece 2 because the rod 18 enters the arcuate diameter portion that is shorter than the distance between the rolling surfaces.

Therefore, the component force _F2 of the spring force P already explained in FIG. do.

In this way, the second
In the figure, when the support shaft 20 at the axis a position and the bearing 21 are fitted together, the actuating piece 2 rotates with respect to the connecting body 8, and even if the rotation is restored by the above-mentioned return mechanism 10, Since the rotation mechanism consisting of the support shaft 20 and the bearing 21 has a double-sided structure, the reaction force from the return mechanism 10 does not cause the support shaft 20 to become eccentric.

Therefore, in the embodiment of the present invention, the support shaft 20 does not become eccentric due to the reaction force of the return mechanism 10.
Accidents in which the door cannot be closed due to the inability of the operating piece 2 to return or the malfunction of the second switch 9 are prevented, and highly reliable operation is performed.

<Effects of the invention> As explained in detail above, according to the invention, it is possible to provide a door safety device that operates with high reliability and does not cause accidents in which the actuating piece cannot return or the door cannot be closed due to malfunction of the switch. .

[Brief explanation of drawings]

FIG. 1 is a front view showing the configuration of an embodiment of the present invention;
FIG. 2 is a partially cutaway front view showing the configuration of the main parts of the embodiment of the present invention, FIG. 3 is a sectional view taken along line V-V in FIG. 2, and FIG. 4 is a sectional view taken along line AA in FIG. 2. Fig. 5 is a sectional view taken along line B-B in Fig. 2, Fig. 6 is an explanatory diagram showing the principle of construction of the return mechanism in the embodiment of the present invention, and Fig. 7 shows the arrangement of a conventionally proposed door safety device. Front view,
FIG. 8 is a partially cutaway front view showing the configuration of the main parts of a conventionally proposed door safety device. 1...door, 2...operating piece, 3...upper seat, 4...
Lower seat, 5... Lever, 6... First switch, 8
... Connecting body, 9 ... Second switch, 10 ... Return mechanism, 12 ... Bearing, 14 ... Reception plate, 16 ...
...Return spring, 18...Rod, 19...Rolling element,
20...Support shaft, 21...Bearing.

Claims (1)

[Claims for Utility Model Registration] (1) A device that is provided protrudingly at the tip of a door that is driven to open and close by an electric motor, is movable in the opening and closing direction of the door, and rotates around a support shaft that is parallel to the surface of the door. a freely movable actuating piece; a coupling body provided on the opposite side to the protruding direction of the actuating piece and forming a rotation mechanism between the actuating piece and the actuating piece for rotating the actuating piece around the support shaft; a lever that is rotatably attached to the door and that moves together with the operating piece in the opening/closing direction of the door to hold the connecting body against the door; and a lever that is actuated by rotation of the lever and that reverses the electric motor. a second switch which is actuated by the rotation of the operating piece about the support shaft and reverses the electric motor; What is claimed is: 1. A door safety device comprising: a return mechanism for returning to the original state, wherein the rotation mechanisms are respectively provided at positions sandwiching the return mechanism. (2) The door safety device according to claim (1) of the utility model registration claim, wherein the rotation mechanism is composed of a shaft provided in the connecting body and a bearing provided in the actuating piece. .