CN115551796A

CN115551796A - Safety device for elevator door

Info

Publication number: CN115551796A
Application number: CN202080100754.8A
Authority: CN
Inventors: 斋藤阳介; 北泽昌也; 望月敬太; 渡边和宏; 天野慎也
Original assignee: Mitsubishi Electric Corp
Current assignee: Mitsubishi Electric Corp
Priority date: 2020-05-25
Filing date: 2020-05-25
Publication date: 2022-12-30
Also published as: JPWO2021240596A1; JP6992933B1; WO2021240596A1; DE112020007235T5

Abstract

Provided is a safety device for an elevator door capable of detecting a rope-shaped obstacle near the ground. The safety device of an elevator door comprises: an upper end device arranged at the upper end of a door shoe arranged at the No. 1 car door of the elevator; and a lower end device that is provided at a lower end of the door shoe, and forms a light flux between the upper end device and the lower end device along an end surface of the door shoe, wherein the lower end device includes a lower light passage surface that passes the light flux and is provided to be inclined downward as being distant from the door shoe.

Description

Safety device for elevator door

Technical Field

The present invention relates to a safety device for an elevator door.

Background

Patent document 1 discloses a safety device for an elevator door, which includes an optical axis sensor provided in a door shoe of the elevator.

Documents of the prior art

Patent document

Patent document 1: japanese laid-open patent publication No. 3-098984

Disclosure of Invention

Problems to be solved by the invention

However, the lower end device of the optical axis sensor described in patent document 1 is disposed at an upper portion several hundreds of millimeters from the ground surface. Therefore, it is difficult to detect an obstacle present at a position close to the ground, such as a pet leash.

The present invention has been made to solve the above problems. The invention aims to provide a safety device of an elevator door, which can detect a rope-shaped obstacle near the ground.

Means for solving the problems

The safety device of an elevator door of the invention comprises: an upper end device arranged at the upper end of a door shoe arranged at the No. 1 car door of the elevator; and a lower end device provided at a lower end of the door shoe, the lower end device forming a light flux between the upper end device and the lower end device along an end surface of the door shoe, the lower end device including a lower light passage surface which passes the light flux and is provided to be inclined downward as being distant from the door shoe.

Effects of the invention

According to the present invention, the lower end device of the optical axis sensor includes the lower light passage surface which passes the light flux and is provided to be inclined downward as being away from the door shoe. Therefore, the safety device of the elevator door can detect a rope-shaped obstacle near the ground.

Drawings

Fig. 1 is a view showing an elevator door according to embodiment 1.

Fig. 2 is a view showing a lower end device of a safety device for an elevator door according to embodiment 1.

Fig. 3 is a view showing a lower end device and a guide assistant of a safety device of an elevator door of embodiment 1.

Fig. 4 is a diagram showing a difference in presence or absence of the 1 st light blocking member in the elevator door according to embodiment 1.

Fig. 5 is a view showing the 1 st antireflection member at the time of the closing operation of the elevator door of embodiment 1.

Fig. 6 is a view showing the 2 nd antireflection member at the time of the closing operation of the elevator door in embodiment 1.

Fig. 7 is a modification of the elevator door of embodiment 1 in which 1 group of optical axis sensors are provided.

Fig. 8 is a modification of the installation position of the guide aid for an elevator door according to embodiment 1.

Fig. 9 is a modification of the elevator door according to embodiment 1.

Fig. 10 is a view showing an elevator door according to embodiment 2.

Fig. 11 is a lower end device of an elevator door according to embodiment 2.

Fig. 12 is a reflecting member of an elevator door according to embodiment 2.

Fig. 13 is a modification of the prism of the safety device for an elevator door according to embodiment 2.

Fig. 14 is a modification 1 of the lower end device of the elevator door according to embodiment 2.

Fig. 15 is a modification 2 of the lower end device of the elevator door according to embodiment 2.

Fig. 16 is a modification 3 of the lower end device of an elevator door according to embodiment 2.

Fig. 17 is a view showing an elevator door according to embodiment 3.

Fig. 18 is a view showing a lower end device of an elevator door according to embodiment 3.

Fig. 19 is a plan view of the elevator door according to embodiment 3, as viewed from the vertically upper direction.

Detailed Description

A mode for carrying out the present invention will be described with reference to the accompanying drawings. In the drawings, the same or corresponding portions are denoted by the same reference numerals. Repeated explanation of this portion is appropriately simplified or omitted.

Embodiment 1.

Fig. 1 is a diagram showing a car door of an elevator according to embodiment 1.

The car, not shown, is disposed inside a hoistway, not shown. The direction of ingress and egress is defined as the direction of ingress and egress of the car. In fig. 1, the advancing direction indicates a direction from the front side to the back side of the paper. The ascending direction indicates a direction from the back side to the front side of the paper.

The

car doors

1a and 1b are provided at an entrance of a car not shown. The

car doors

1a and 1b perform opening and closing operations by moving in the horizontal direction. One direction is defined as a direction to the right of the paper surface in the horizontal direction. The other direction is defined as a left direction of the paper surface in the horizontal direction.

For example, the door shoe 2 includes a multi-optical axis sensor projector. For example, the door shoe 2 includes a plurality of light projecting portions in the longitudinal direction, and the light projecting portions transmit the optical axis. The door shoe 2 has a front edge 2a and a rear edge 2b.

The door shoe 2 is provided to the car door 1a. The door shoe 2 is provided to protrude toward one direction side of the car door 1a. For example, the door shoe 2 is provided to illuminate the optical axis of the multi-optical axis sensor to the car door 1b.

The front edge 2a is a region indicating an edge and a face in one direction in the door shoe 2. For example, the front edge 2a includes a plurality of light projecting portions of a multi-optical axis sensor.

The rear edge 2b is a region indicating an edge and a face located in the other direction in the door shoe 2.

For example, the multiple optical axis sensor photoreceiver 3 is provided to the car door 1b. For example, the multiple optical axis sensor photoreceiver 3 is provided on the other direction side of the car door 1b. For example, the multiple optical axis sensor photoreceptor 3 is provided to receive multiple optical axes of the multiple optical axis sensor.

The multi-optical-axis sensor light receiver 3 receives a plurality of optical axes of the multi-optical-axis sensor light projector. For example, the multi-optical axis sensor photodetector 3 transmits a detection signal of an obstacle when not receiving any of the plurality of optical axes. The multi-optical axis sensor includes a multi-optical axis sensor projector provided on the door shoe 2, and a multi-optical axis sensor receiver 3.

For example, the controller 4 includes a control mechanism using an electric circuit therein. For example, the controller 4 is provided on an upper portion of a car not shown. For example, the controller 4 controls the opening and closing operations of the

car doors

1a and 1b by a car door driving device not shown.

For example, the controller 4 is electrically connected to the multi-optical axis sensor photodetector 3. For example, the controller 4 performs the opening operation of the

car doors

1a and 1b when receiving a detection signal of an obstacle during the car door closing operation.

The 1-group optical axis sensor 30a includes an upper end device 31a and a lower end device 33a. The 1-group optical axis sensor 30a is detachably provided to the door shoe 2. For example, 1 set of optical axis sensors 30a forms a beam 50a between the upper end device 31a and the lower end device 33a. The 1 set of optical axis sensors 30a form an optical axis 50 between the upper end device 31a and the lower end device 33a. The optical axis 50 is defined as an area where the beam density is highest in the cross-section of the beam 50a formed by the 1 group of optical axis sensors 30a. I.e. the light beam 50a comprises the optical axis 50. For example, 1 set of optical axis sensors 30a forms an optical axis 50 in the vicinity of the leading edge 2a.

For example, the upper end device 31a has a rectangular parallelepiped shape. The upper end device 31a includes an upper light-passing surface 32a. For example, the upper end device 31a includes a light receiver 35a.

The upper end device 31a is provided on the upper surface of the door shoe 2. The upper end device 31a is provided so that the upper light passage surface 32a becomes the lower surface. The upper end device 31a is provided such that an upper light passing surface 32a protrudes from the door shoe 2 toward the front edge 2a. For example, the upper end device 31a is electrically connected to the controller 4.

For example, the upper end device 31a receives the optical axis 50 after passing through the upper light passing surface 32a. For example, the upper end device 31a transmits a detection signal of an obstacle to the controller 4 when the optical axis 50 is not received.

The lower end device 33a includes a lower light passage surface 34a. For example, the lower end device 33a includes a light projector 36a.

The lower end device 33a is provided on the lower surface of the door shoe 2. The lower end device 33a is disposed such that the lower light passage surface 34a faces upward. The lower end means 33a is arranged such that a lower light passing surface 34a protrudes from the door shoe 2 in the direction of the front edge 2a. The lower end device 33a is provided such that the lower light passage surface 34a is inclined vertically downward as it goes in one direction.

For example, the lower end device 33a causes the optical axis 50 to be transmitted through the lower light passage surface 34a.

The 1 st light shielding member 10 is provided at the front edge 2a. For example, the 1 st light shielding member 10 shields a part of the region near the leading edge 2a in the optical axis 50.

The 1 st antireflection member 11 is provided to the car door 1b. The 1 st antireflection member 11 is provided on the side surface of the car door 1b in the boarding direction. For example, the 1 st antireflection member 11 is provided at the center in the vertical direction of the car door 1b.

The 1 st antireflection member 11 suppresses the side reflection of the stray light portion in the elevator-advancing direction of the car door 1b. The stray light portion indicates an area of the light beam 50a away from the optical axis 50.

For example, the 2 nd antireflection member 12 is provided on the multiple optical axis sensor photodetector 3. For example, the 2 nd antireflection member 12 is provided on the side surface in the other direction in the multi-optical axis sensor photodetector 3. For example, the 2 nd antireflection member 12 is provided at the center in the vertical direction of the multiple optical axis sensor photodetector 3.

The 2 nd antireflection member 12 suppresses the reflection of the stray light part by the multiple optical axis sensor photodetector 3.

For example, the guide aid 13 has an inclined surface. The guide assistant 13 is provided at the lower end of the car door 1b. The guiding aid 13 is provided on the other direction side of the car door 1b. The guide aid 13 is provided such that the inclined surface is inclined in a vertically downward direction as it goes in the other direction. For example, the guide aid 13 is provided such that the lower surface is as close as possible to the car floor, not shown.

For example, the safety device 100 for an elevator door includes a car door 1a, a car door 1b, a door shoe 2, a multi-optical axis sensor, a controller 4, a 1 st light blocking member 10, a 1 st anti-reflection member 11, a 2 nd anti-reflection member 12, a guidance aid 13, and 1 group of optical axis sensors 30a. For example, the safety device 100 performs the following operation to suppress the human or object from being caught by the car door.

When a user, not shown, crosses the doorway of the car during a period from the start of the closing operation to the completion of the closing operation of the

car doors

1a and 1b, any optical axis of the multi-optical axis sensor is blocked by the user. In this case, any light receiving part of the multiple optical axis sensor photodetector 3 does not detect the optical axis.

When any light receiving unit of the multiple optical axis sensor light receiver 3 does not detect the optical axis, the multiple optical axis sensor light receiver 3 transmits a detection signal indicating that an obstacle is present to the controller 4.

The controller 4 receives a detection signal of an obstacle. Then, the controller 4 performs the opening operation of the

car doors

1a and 1b. Therefore, the safety device 100 suppresses the user from being caught between the car door 1a and the car door 1b.

For example, when the rope contacts the front edge 2a of the door shoe 2 during a period from the start of the closing operation to the completion of the closing operation of the

car doors

1a and 1b, the optical axis 50 is blocked by the rope. In this case, the upper end device 31a does not detect the optical axis 50.

In the case where the upper end device 31a does not detect the optical axis 50, the upper end device 31a transmits a detection signal of an obstacle to the controller 4.

car doors

1a and 1b. Therefore, for example, the safety device 100 suppresses the rope from being caught between the car door 1a and the car door 1b.

Next, the lower light passage surface 34a of the lower end device 33a will be described with reference to fig. 2.

As shown in fig. 2, the lower end device 33a is disposed such that the lower light passage surface 34a is inclined with respect to the horizontal direction.

The optical axis 50 is formed to pass through the lower light passing surface 34a.

For example, the lower light passage surface 34a is provided with an inclination to an extent sufficient to suppress the accumulation of the dust 61. For example, assume that the trash 61 is dust, soil, thread ends, or the like.

Next, the operation of the inclined surface of the guide jig 13 and the lower light passage surface 34a when the

car doors

1a and 1b are closed will be described with reference to fig. 3.

Fig. 3 is a view showing a lower end device and a guide assistant of the safety device for an elevator door according to embodiment 1.

As shown in fig. 3, the guide aid 13 is provided to the car door 1b such that the inclined surface is inclined with respect to the horizontal direction.

For example, when the rope 60 is present at a position close to a car floor, not shown, during the closing operation of the

car doors

1a and 1b, the inclined surface of the guide aid 13 pushes up the rope 60 in the upward direction in association with the closing operation. For example, the lower light passage surface 34a pushes up the string 60 in the upward direction in accordance with the closing operation.

Then, the string 60 moves to a position to shield the optical axis 50. Thus, the safety device 100 detects the rope 60 present at a position close to the car floor.

Next, the operation of the 1 st light shielding member 10 will be described with reference to fig. 4.

Fig. 4a is a diagram showing the safety device 100 according to embodiment 1. As shown in fig. 4, for example, when the cord 60 comes into contact with the door shoe 2, the cord 60 may bend with both ends of the front edge 2a as fulcrums and deform in one direction into a mountain-like shape. For example, the 1 st shade member 10 is provided to protrude from the leading edge 2a by the same width as the gap between the curved string 60 and the leading edge 2a. For example, the 1 st light blocking member 10 is provided so as to be able to block the optical axis 50 by the bent string 60 and the 1 st light blocking member 10.

Fig. 4B is a diagram showing a safety device 100 as a comparative example without the 1 st light shielding member 10. In the comparative example, the bent string 60 blocks only a part of the optical axis 50. The unshielded area of the optical axis 50 is detected by the upper end device 31 a. Therefore, the upper end device 31a does not transmit the detection signal of the obstacle.

Next, the 1 st antireflection member 11 will be described with reference to fig. 5.

Fig. 5a is a diagram showing the safety device 100 according to embodiment 1. As shown in a of fig. 5, for example, the 1 st antireflection member 11 is provided at the center in the vertical direction of the car door 1b. For example, the 1 st antireflection member 11 is provided so as not to interfere with the operation of the multi-optical axis sensor photodetector 3. The 1 st antireflection member 11 suppresses the 1 st stray light portion 51 from reflecting on the car door 1b. The 1 st stray light part 51 is an area of an end in the exit direction of the light flux 50a.

Fig. 5B is a diagram showing a security device 100 as a comparative example which does not include the 1 st anti-reflection member 11. In the comparative example, for example, the 1 st stray light portion 51 is reflected by the car door 1b. The upper end device 31a detects the reflected 1 st stray light part 51. Therefore, the upper end device 31a does not transmit a detection signal of the presence of an obstacle regardless of the presence or absence of an obstacle.

Next, the 2 nd antireflection member 12 will be described with reference to fig. 6.

In fig. 6, for example, the 2 nd antireflection member 12 is provided at the center in the vertical direction of the multiple optical axis sensor photodetector 3. For example, when the distance between the door shoe 2 and the multiple optical axis sensor photodetector 3 is reduced by the closing operation, the 2 nd antireflection member 12 suppresses the 2 nd stray light portion 52, which is the horizontal end portion of the light flux 50a, from being reflected by the multiple optical axis sensor photodetector 3.

According to embodiment 1 described above, the elevator door includes the car door 1a as the 1 st car door. The elevator door includes a car door 1b as a 2 nd car door. The 1-group optical axis sensor 30a includes an upper end device 31a and a lower end device 33a. The upper end device 31a is provided at the upper end of the door shoe 2. The lower end device 33a is provided at the lower end of the door shoe 2. The lower end device 33a forms a light beam 50a between itself and the upper end device 31 a. When the 1-group optical axis sensor 30a transmits a detection signal indicating that an obstacle is present, the safety device 100 moves the car door 1a and the car door 1b in the opening direction. The lower end device 33a includes a lower light passage surface 34a through which the light flux 50a passes. The lower light passage surface 34a is provided so as to be inclined vertically downward as being distant from the door shoe 2. Therefore, the lower light passage surface 34a can push up the string 60 in the upward direction in association with the closing operation. As a result, the safety device 100 can detect a rope-like obstacle near the ground. The lower light passage surface 34a can prevent the dust 61 from being deposited on the upper surface.

The upper end device 31a includes a light receiver 35a. The lower end device 33a includes a light projector 36a. The 1 set of optical axis sensors 30a form a light beam 50a and an optical axis 50 from the lower end device 33a towards the upper end device 31 a. Therefore, the light flux 50a converges as it goes downward. As a result, the safety device 100 can improve the detection capability of the obstacle present below.

The 1-group optical axis sensor 30a may also include a light receiver 35a at the lower side. The 1-group optical axis sensor 30a may include a light projector 36a above. That is, the upper end device 31a includes the light projector 36a. The lower end device 33a includes a light receiver 35a. In this case, the lower end device 33a transmits a detection signal of the presence of the obstacle to the controller 4. As a result, the safety device 100 can improve the detection capability of the obstacle present above.

The upper end device 31a and the lower end device 33a are detachably provided to the door shoe 2. As a result, the safety device 100 can improve the workability in maintenance of the 1-group optical axis sensor 30a.

The door shoe 2 is provided with a multi-optical axis sensor projector. The multi-optical axis sensor light receiver 3 is provided in the car door 1b so as to face the multi-optical axis sensor light projector. That is, the safety device 100 includes a multi-optical axis sensor. Therefore, the safety device 100 can detect the presence of an obstacle without contacting the obstacle.

Further, the 1 st light shielding member 10 is provided to the door shoe 2. The 1 st light shielding member 10 shields a part of the area near the leading edge 2a in the light beam 50a. Therefore, the 1 st light blocking member 10 can block a part of the optical axis 50 that passes through the string 60 when it is bent. As a result, the safety device 100 can improve the detection accuracy of the obstacle.

The 1 st antireflection member 11 is provided on the side surface of the car door 1b in the elevator entrance direction. That is, the 1 st antireflection member 11 is provided on the side surface of the car door 1b in the car interior direction. Therefore, the 1 st anti-reflection member 11 can suppress the 1 st stray light portion 51 in the car door 1b from reflecting. As a result, the safety device 100 can improve the detection accuracy of the obstacle.

The 2 nd antireflection member 12 is provided on the side surface of the multiple optical axis sensor photodetector 3 in the other direction so as to face the door shoe 2. Therefore, the 2 nd antireflection member 12 can suppress the reflection of the 2 nd stray light portion 52 in the horizontal direction by the multiple optical axis sensor photodetector 3. As a result, the safety device 100 can improve the obstacle detection accuracy.

Further, a guidance aid 13 is provided at the lower end of the car door 1b. The guide aid 13 is provided such that the inclined surface is inclined vertically downward as it goes toward the other direction. Therefore, the guide aid 13 can push up the string 60 in the upward direction in association with the closing operation. As a result, the safety device 100 can improve the detection capability of the rope 60 existing below.

Next, a modified example of the light receiver 35a and the light projector 36a of the 1-group optical axis sensor 30a will be described with reference to fig. 7.

Fig. 7 is a modification of the optical axis sensor 30a of the elevator door according to embodiment 1.

As shown in fig. 7, in a modification of the optical axis sensor 30a according to embodiment 1, the upper end device 31a includes a light receiver 35a and a light projector 36a. The lower end device 33a includes a reflector 37a. For example, the lower light passage surface 34a includes a reflector 37a.

For example, the reflector 37a has a surface having photorefractive properties. The reflector 37a reflects the light on the surface in the direction in which the light is incident.

The light projector 36a of the upper end device 31a emits an optical axis 50. Then, the optical axis 50 is reflected at the lower end device 33a. The reflected optical axis 53 is received by the light receiver 35a of the upper end device. The reflection optical axis 53 is an optical axis after the optical axis 50 is reflected at the lower end device 33a.

According to the modification of the optical axis sensor 30a of embodiment 1 described above, the upper end device 31a includes the light receiver 35a and the light projector 36a. The lower end device 33a includes a reflector 37a. The optical axis 50 emerging from the upper end device 31a is reflected at the lower end device 33a. The reflected optical axis 53 is received by the light receiver 35a of the upper end device 31 a. Therefore, the lower end device 33a can be downsized compared to the lower end device 33a of embodiment 1. Further, the 1-group optical axis sensor 30a can detect an obstacle using the light beam 50a and the reflected optical axis 53. Therefore, the safety device 100 can improve the detection accuracy of the obstacle.

The door shoe 2 may be mechanical. For example, the car door 1a performs an opening operation by moving the door shoe 2 relative to the car door 1a in a closing direction.

Next, a modification of the installation position of the guide assistive device 13 will be described with reference to fig. 8.

As shown in fig. 8, a guidance aid 13 is provided at the lower end of the car door 1b. The guide aid 13 is provided so that the lower part thereof is present in the region of the groove of the car sill. When the car door 1b moves, the guide jig 13 moves in the region of the groove of the car sill.

The lower portion of the car door 1a, not shown, is provided with a notch, not shown. The cutout accommodates the guide auxiliary 13 inside when the car door 1a and the car door 1b are fully closed.

In the modification of the installation position of the guide aid in embodiment 1 described above, the lower portion of the guide aid 13 is present in the region of the groove of the car sill. When the car door 1b moves, the guide jig 13 moves in the region of the groove of the car sill. Therefore, the guide assistant 13 can push up the obstacle in contact with the ground in the upward direction. As a result, the safety device 100 can improve the obstacle detection capability.

The guidance assistance tool 13 may be provided to the car door 1a in addition to the car door 1b.

For example, the safety device 100 includes 2 guide aids 13. One of the 2 guidance aids 13 is provided to the car door 1b. The other of the 2 guiding aids 13 not shown in fig. 9 is provided on one direction side of the lower end of the car door 1a. The other of the 2 guide aids 13 is provided such that the inclined surface is inclined in the vertical direction as it goes in one direction. The other of the 2 guide aids 13 is provided at a position where it does not physically interfere with one of the 2 guide aids 13 when the car door 1a and the car door 1b are in the fully closed state.

Therefore, the 2 guide aids 13 can push up the obstacle existing below in the upward direction. As a result, the safety device 100 can improve the detection capability of the obstacle existing below.

Next, an example of installation of the security device 100 in the single-door opening system will be described with reference to fig. 9.

Fig. 9 is a modification of the elevator door according to embodiment 1.

As shown in fig. 9, the elevator door is of single-open type. For example, the elevator door is 2S type. The elevator door includes a car door 1c and a door stopper 5.

The car door 1c is provided at an entrance of a car not shown. The car door 1c performs an opening and closing operation by moving in the horizontal direction. The car door 1c includes a door shoe 2. In the fully closed state, one side end of the car door 1c is received in the receiving space of the elevator door.

The door stopper 5 is, for example, a rod-shaped member. The door shield 5 is connected to the car by a door shield pillar, for example. The door shield 5 is disposed in the accommodating space. The door stop 5 is provided to face the car door 1c. For example, when the car door 1c is in the fully closed state, the door stopper 5 contacts the door shoe 2.

For example, the door shoe 2 includes a multi-optical axis sensor projector. For example, the door shoe 2 includes a plurality of light projecting sections in the longitudinal direction, and the light projecting sections transmit optical axes.

The door shoe 2 is provided to protrude toward one direction side of the car door 1c. For example, the door shoe 2 is provided to irradiate the optical axis of the multi-optical axis sensor to the door stopper 5.

For example, the multiple optical axis sensor photodetector 3 is provided in the door shield 5. For example, the multiple optical axis sensor photodetector 3 is provided on the other direction side of the door stopper 5. For example, the multiple optical axis sensor photoreceiver 3 is provided to receive multiple optical axes of the multiple optical axis sensor.

The 1-group optical axis sensor 30a includes an upper end device 31a and a lower end device 33a. The 1-group optical axis sensor 30a is detachably provided to the door shoe 2.

The 1 st antireflection member 11 is provided in the elevator entrance direction of the accommodation space on the car side. The 1 st antireflection member 11 is provided on the other side of the door stopper 5. For example, the 1 st antireflection member 11 is provided at the same height as the center of the car door 1c in the vertical direction.

The guide aid 13 is provided at the lower end of the door stop 5 such that the inclined surface is inclined with respect to the horizontal direction. For example, the guide aid 13 is provided on the other direction side of the door stopper 5. The guide aid 13 is provided such that the inclined surface is inclined in a vertically downward direction as it goes in the other direction. For example, the guide aid 13 is provided such that the lower portion is present in a region of a car sill, not shown. For example, the guide aid 13 is provided such that the inclined surface is present at a part of the doorway of the car. For example, when the car doors 1c are in the fully closed state, the guide aids 13 are housed in cutouts provided in the lower portions of the car doors 1c.

In the modification of the elevator door according to embodiment 1 described above, the elevator door includes the door stopper 5. The 1 st antireflection member 11 is provided in the elevator entrance direction of the car-side housing space. Therefore, the 1 st anti-reflection member 11 can suppress the 1 st stray light part 51 not shown in fig. 9 from reflecting on the car side surface. As a result, the safety device 100 can improve the obstacle detection accuracy.

The 2 nd antireflection member 12 is provided on the side surface of the multiple optical axis sensor photodetector 3 in the other direction so as to face the door shoe 2. Therefore, the 2 nd antireflection member 12 can suppress the 2 nd stray light portion 52 in the horizontal direction from being reflected by the multiple optical axis sensor photodetector 3. As a result, the safety device 100 can improve the detection accuracy of the obstacle.

Furthermore, a guide aid 13 is provided at the lower end of the door stop 5. The guide aid 13 is provided such that the inclined surface is inclined in a vertically downward direction as it goes in the other direction. Therefore, the guide aid 13 can push up the rope 60, not shown in fig. 9, which is an obstacle in the upward direction in association with the closing operation. As a result, the safety device 100 can improve the detection capability of the rope 60 existing below.

The door shoe 2 may be mechanical. For example, the car door 1c performs an opening operation by moving the door shoe 2 relative to the car door 1c in a closing direction. When the door shoe 2 is of a mechanical type, the 2 nd antireflection member 12 is provided on the door stopper 5.

The guide aid 13 may be provided to the car door 1c in addition to the door stop 5.

For example, the safety device 100 includes 2 guide aids 13. One of the 2 guide aids 13 is provided on the door shield 5. The other of the 2 guide aids 13 not shown in fig. 9 is provided on one direction side of the lower end of the car door 1c. The other of the 2 guide aids 13 is provided such that the inclined surface is inclined in the vertical direction as it goes in one direction. The other of the 2 guide aids 13 is provided at a position where it does not physically interfere with one of the 2 guide aids 13 when the car door 1c is in the fully closed state.

Embodiment 2.

Fig. 10 is a view showing an elevator door according to embodiment 2. The same or corresponding portions as those in embodiment 1 are denoted by the same reference numerals. The description of this part is omitted.

As shown in fig. 10, the safety device 100 includes 1 set of optical axis sensors 30b. The 1-group optical axis sensor 30b includes an upper end device 31b and a lower end device 33b. The 1 set of optical axis sensors 30b form a light beam 50a between the upper end device 31b and the lower end device 33b. The 1 set of optical axis sensors 30b form an optical axis 50 between the upper end device 31b and the lower end device 33b.

For example, the upper end device 31b has the same configuration as the upper end device 31a of embodiment 1.

The lower end device 33b includes a lower light passage surface 34b, a light projector 36b, and a light guide 40.

For example, the lower end device 33b is provided on the lower surface of the door shoe 2. For example, the lower end device 33b is connected to the lower surface and the rear edge 2b of the door shoe 2. The lower end device 33b is disposed such that the lower light passage surface 34b faces upward. For example, the lower end device 33b is provided such that the lower light passage surface 34b has an angle of 45 degrees or more with respect to the horizontal plane.

For example, light projector 36b is connected to trailing edge 2b.

For example, the light guide 40 is located below the door shoe 2. For example, the light guide 40 is connected to the lower light passing surface 34b. The light guide 40 changes the traveling direction of the received light beam 50a vertically upward.

Next, the light projector 36b and the light guide 40 of the lower end device 33b will be described with reference to fig. 11.

Fig. 11 is a lower end device of an elevator door according to embodiment 2.

As shown in fig. 11, the light projector 36b is connected to the rear edge 2b. For example, the light projector 36b irradiates the light beam 50a vertically downward.

For example, the light guide 40 includes a lens 41 and a reflecting member 42. The light guide 40 is disposed below the door shoe 2.

The lens 41 is, for example, a convex lens. The lens 41 is disposed such that the convex surface faces the light projector 36b. For example, the optical axis of the lens 41 is set to coincide with the optical axis 50. For example, the lens 41 is set so that the focal point coincides with the light source of the projector 36b.

For example, the reflecting member 42 includes a prism. The reflecting member 42 allows light to pass therethrough. The reflecting member 42 changes the traveling direction of light by reflecting the light on the inner wall.

For example, the reflecting member 42 is provided inside the lower end device 33b. For example, the end of the reflecting member 42 in the other direction is provided below the lens 41. For example, one end of the reflecting member 42 in one direction is connected to the lower light passage surface 34b. The reflecting member 42 is provided so that the optical axis 50 is emitted directly upward.

The light flux 50a emitted from the light projector 36b passes through the lens 41, the reflecting member 42, and the lower light passage surface 34b. Then, the light beam 50a is emitted from the lower end device 33a.

The projector 36a emits a light beam 50a in a vertical downward direction. Light projector 36a emits light beam 50a in a radial shape.

The light beam 50a enters the lens 41. For example, the light beam 50a is collimated by the lens 41. "collimated" is defined as having the angles of a plurality of rays consistently parallel. Therefore, the light flux 50a is emitted in parallel from the lens 41 in the downward direction. Then, the light flux 50a enters the reflecting member 42.

The light beam 50a changes the traveling direction inside the reflecting member 42. The light beam 50a travels inside the reflecting member 42 in the direction of the leading edge 2a. Then, the light flux 50a travels vertically upward. The light flux 50a is emitted from the reflecting member 42 in the vertical direction.

The light flux 50a passes through the lower light passage surface 34b and is emitted from the lower end device 33b in the vertically upward direction.

Next, the shape of the prism included in the light guide 40 of the 1-group optical axis sensor 30b will be described with reference to fig. 12.

Fig. 12 is a light guide for an elevator door according to embodiment 2.

As shown in fig. 12, for example, the reflecting member 42 includes a prism 42a.

The prism 42a has a trapezoidal shape. The prism 42a has 2 base angles that are equal. For example, the lower base of the prism 42a has a base angle θ _b 。

The prism 42a is disposed such that the upper and lower bases are parallel to the horizontal direction. The prism 42a is provided so that the optical axis 50 enters the waist on one direction side. The prism 42a is arranged such that the optical axis 50 is emitted from the other direction side waist.

Optical axis 50 at an incident angle θ ₁ Enters the prism 42a. Optical axis 50 at exit angle θ ₂ And exits the prism 42a. 2 base angles of the underground bottom are equal to theta in the manner of FIG. 10 _b In the case of (2), the exit angle θ ₂ Not depending on the refractive index of the prism 42a but on the incident angle theta ₁ . For example, the exit angle θ ₂ Is equal to the incident angle theta irrespective of the refractive index of the prism 42a ₁ 。

According to embodiment 2 described above, the elevator door includes the car door 1a as the 1 st car door. The elevator door includes a car door 1b as a 2 nd car door. The 1-group optical axis sensor 30b includes an upper end device 31b and a lower end device 33b. The upper end device 31b is provided at the upper end of the door shoe 2. The lower end device 33b is provided at the lower end of the door shoe 2. The lower end device 33b forms a light beam 50a between it and the upper end device 31 b. When the 1-group optical axis sensor 30b transmits a detection signal indicating the presence of an obstacle, the safety device 100 moves the

car doors

1a and 1b in the opening direction. The lower end device 33b includes a light guide 40. The light guide 40 is disposed below the door shoe 2. The light guide 40 changes the traveling direction of the received light beam 50a in the vertical upward direction. Therefore, the light projector 36b can be provided in a portion other than the vicinity of the front edge 2a of the door shoe 2. That is, the protruding portion of the lower end device 33b can be made small. The door shoe 2 can be disposed at a lower position. As a result, the safety device 100 can extend the detection range of the lower portion of the gate shoe.

The upper end device 31b includes a light receiver 35b. The lower end device 33b includes a projector 36b. The 1 set of optical axis sensors 30b form a light beam 50a and an optical axis 50 from the lower end device 33b towards the upper end device 31 b. Therefore, the light flux 50a converges as it goes downward. As a result, the safety device 100 can improve the detection capability of the obstacle present below.

Further, the light guide 40 is provided to protrude from the door shoe 2 in the direction of the rear edge 2b. Light projector 36b is provided at rear edge 2b. The light projector 36b is provided to emit the light beam 50a vertically downward. Therefore, in the lower end device 33b, the area located below the door shoe 2 can be reduced. As a result, the safety device 100 can extend the detection range of the gate shoe 2.

The lower end device 33b is provided such that the lower light passage surface 34b has an angle of 45 degrees or more with respect to the horizontal plane. Therefore, when the traveling direction of the light flux 50a is changed to the vertical direction, the light flux 50a is converged in the horizontal direction. The width of the light beam 50a in the horizontal direction becomes narrow. As a result, the safety device 100 can improve the obstacle detection capability.

The light guide 40 includes a prism 42a. The prism 42a can change the traveling direction of the light beam 50a by reflecting the light beam 50a on the inner wall. Therefore, the light projector 36b can be disposed at a position not directly below the light receiver 35b. As a result, the safety device 100 can reduce the size of the region protruding toward the leading edge side in the lower end device 33b.

The prism 42a has a trapezoidal cross section having 2 base angles equal to each other at the lower base. The optical axis 50 passes through the waist on one side and the waist on the other side of the trapezoid. Therefore, on the optical axis 50, the off-angle of the prism 42a does not depend on the refractive index of the prism 42a. The off angle of the prism 42a is determined by the incident angle to the prism 42a. As a result, the safety device 100 can keep the position of the optical axis 50 constant regardless of the change in the refractive index due to the temperature change.

The light guide 40 includes a lens 41. The lens 41 has a convex lens shape. The lens 41 faces the light projector 36b. The lens 41 is disposed so that the focal point coincides with the light source of the projector 36b. Thus, the light beam 50a is collimated by the lens 41. As a result, the safety device 100 can suppress stray light of the light flux 50a.

The lower end device 33b includes a lower light passage surface 34b. The lower light-passing surface 34b passes the light beam 50a. The lower light passage surface 34b is provided to be inclined in the vertical downward direction as it is separated from the door shoe 2. Therefore, the lower light passage surface 34b can push up the string 60 in the upward direction in association with the closing operation. The lower light passage surface 34b can prevent the dust 61 from being deposited on the upper surface.

Next, a modification of the shape of the prism 42a will be described with reference to fig. 13.

As shown in fig. 13, for example, the prism 42a has a hexagonal shape. The prism 42a has an angle θ _c The opposite 2 corners. The prism 42a has an angle θ at the lowermost side _d Adjacent 2 corners.

Optical axis 50 at an incident angle θ ₁ Enters the prism 42a. Optical axis 50 at angle θ _c Angle of (a) and angle theta _d Is reflected to the interior of the prism 42a. Optical axis 50 at exit angle θ ₂ And exits the prism 42a.

In the modification of the prism of embodiment 2 described above, the exit angle θ ₂ Not on the refractive index of the prism 42a but on the refractive indexAngle of incidence theta ₁ . For example, the exit angle θ ₂ Is equal to the incident angle theta irrespective of the refractive index of the prism 42a ₁ . As a result, the safety device 100 can keep the position of the optical axis 50 constant regardless of the change in the refractive index due to the temperature change.

Next, a description will be given of a 1 st modification of the lower end device 33b of the optical axis sensor 30b of group 1 with reference to fig. 14.

Fig. 11 is a modification 1 of the lower end device of the elevator door according to embodiment 2.

As shown in fig. 14, in modification 1, the lower end device 33b includes a light projector 36b and a light guide 40.

The light projector 36b is connected to the rear edge 2b. For example, the light projector 36b irradiates the light beam 50a in a vertical downward direction.

The light guide 40 includes a prism 43 having a curved lens surface.

The prism 43 with a lens curved surface includes a curved surface 43a and an emission surface 43b. For example, the prism 43 with a lens curved surface is disposed such that the curved surface 43a faces the light projector 36b. For example, the prism 43 with a lens curved surface is arranged so that the light source of the light projector 36b is located at the focal point of the curved surface 43 a. For example, the prism 43 with a lens curved surface is disposed such that the exit surface 43b is located below the lower light passing surface 34b.

The curved surface 43a has a convex curved surface.

The light beam 50a enters the prism 43 with a lens curved surface at the curved surface 43 a. For example, the light beam 50a is collimated at the curved surface 43 a. Then, the light flux 50a passes through the inside of the prism 43 with a lens curved surface and exits from the exit surface 43b.

According to the 1 st modification of embodiment 2 explained above, the light guide 40 includes the prism 43 with a lens curved surface. The prism 43 with a lens curved surface has a convex curved surface. The prism 43 with a lens curved surface is provided with a convex curved surface facing the light projector 36b. The prism 43 with a lens curved surface changes the traveling direction of the optical axis 50 by internally reflecting the optical axis 50. Thus, the light guide 40 can collimate the light beam 50a. As a result, the safety device 100 can suppress stray light of the light flux 50a.

Next, a 2 nd modification of the lower end device 33b of the 1-group optical axis sensor 30b will be described with reference to fig. 15.

As shown in fig. 15, in modification 2, the lower end device 33b includes a light projector 36b and a light guide 40.

Light projector 36b is connected to trailing edge 2b. The light projector 36b irradiates the light beam 50a in one horizontal direction.

For example, the light guide 40 includes a prism 43 with a lens curved surface.

For example, the prism 43 with a lens curved surface includes a curved surface 43a and an emission surface 43b. For example, the prism 43 with a lens curved surface is disposed such that the curved surface 43a faces the light projector 36b. For example, the prism 43 with a lens curved surface is disposed so that the light source of the light projector 36b is located at the focal point of the curved surface 43 a. For example, the prism 43 with a lens curved surface is disposed such that the exit surface 43b is located below the lower light passing surface 34b.

For example, the curved surface 43a has a convex curved surface.

The light beam 50a enters the prism 43 with a lens curved surface at the curved surface 43 a. For example, the light beam 50a is collimated at the curved surface 43 a. Then, the light flux 50a passes through the inside of the prism 43 with a lens curved surface and is emitted from the emission surface 43b.

The light guide 40 may not have the prism 43 with a lens curved surface. For example, the light guide 40 includes a prism having no curved surface.

According to the 2 nd modification of embodiment 2 explained above, the light projector 36b is connected to the rear edge 2b. The light projector 36b transmits a light beam 50a traveling in a horizontal direction toward the light guide 40. Therefore, the lower end device 33b may not include the light projector 36b below the door shoe 2. The portion of the lower end device 33b below the door shoe 2 can be miniaturized. As a result, the door shoe 2 can be set at a lower position.

Next, a 3 rd modification of the lower end device 33b of the group 1 optical axis sensor 30b will be described with reference to fig. 16.

Fig. 16 is a modification 3 of the lower end device of the elevator door according to embodiment 2.

As shown in fig. 16, in modification 3, the lower end device 33b includes a light projector 36b and a light guide 40.

The light projector 36b is disposed below the door shoe 2. For example, the light projector 36b irradiates the light beam 50a in one direction.

For example, the light guide 40 includes a prism 43 having a lens curved surface.

For example, the curved surface 43a has a convex curved surface.

According to the 3 rd modification of embodiment 2 explained above, the light receiver 35b is provided below the door shoe 2. The light receiver 35b sends the light beam 50a toward the light guide 40. The light receiver 35b transmits the light beam 50a in one horizontal direction. Therefore, the light projector 36b can be installed at a position not directly below the light receiver 35b. As a result, the safety device 100 can reduce the size of the region protruding toward the leading edge side in the lower end device 33b.

The light guide 40 may not have the prism 43 with a lens curved surface. For example, the light guide 40 includes a prism having no curved surface. For example, the light guide 40 includes a mirror.

Embodiment 3.

Fig. 17 is a view showing an elevator door according to embodiment 3. The same or corresponding portions as those in embodiment 1 or embodiment 2 are denoted by the same reference numerals. The description of this part is omitted.

As shown in fig. 17, the security device 100 includes 1 set of the optical axis sensor 30c, the 1 st antireflection member 11, and the 2 nd light shielding member 14. The 1-group optical axis sensor 30c includes an upper end device 31c and a lower end device 33c.

The 1 set of optical axis sensors 30c form a beam 50a between the upper end device 31c and the lower end device 33c. The 1 set of optical axis sensors 30c form an optical axis 50 between the upper end device 31c and the lower end device 33c. For example, 1 set of optical axis sensors 30c form an optical axis 50 in the vicinity of the leading edge 2a. For example, 1 set of optical axis sensors 30c form an optical axis 50 along the end face of the door shoe. For example, the optical axis 50 is formed at a position in one direction in the ascending direction with respect to the front edge 2a by 1 group of optical axis sensors 30c.

For example, the upper end device 31c has a rectangular parallelepiped shape. The upper end device 31c has an upper light-passing surface 32c. For example, the upper end device 31c includes a light receiver 35c.

The upper end device 31c is provided on the upper surface of the door shoe 2. The upper end device 31c is provided to protrude from the door shoe 2 in the ascending direction. The upper end device 31c is provided such that an upper light passing surface 32c protrudes from the door shoe 2 toward the front edge 2a. The upper end device 31c is provided so that the upper light passage surface 32a becomes the lower surface. For example, the upper end device 31c is electrically connected to the controller 4, not shown.

For example, the upper end device 31c receives the optical axis 50 after passing through the upper light passing surface 32c. For example, when the optical axis 50 is not received, the upper end device 31c transmits a detection signal indicating that an obstacle is present to the controller 4, which is not shown.

The lower end device 33c is provided on the side surface of the door shoe 2 in the ascending direction. The lower end device 33c is disposed below the door shoe 2. The lower end means 33c is arranged such that the optical axis 50 passes through the lower light passing surface 34c.

For example, the lower end device 33c transmits the optical axis 50 through the lower light passage surface 34c.

For example, the 2 nd light shielding member 14 has a rectangular parallelepiped shape. For example, the length in the advancing direction of the 2 nd shutter member 14 is equal to the length in the advancing direction of the lower end device 33c.

The 2 nd light blocking member 14 is provided on the side surface of the door shoe 2 in the ascending direction. The 2 nd light shielding member 14 is provided between the upper light passage surface 32c and the lower light passage surface 34c. For example, the side surface of the 2 nd light shielding member 14 in one direction is provided on the same plane as the front edge 2a. For example, the 2 nd light shielding member 14 shields a partial region on the other direction side in the optical axis 50.

Next, the structure of the lower end device 33c will be described with reference to fig. 18.

As shown in fig. 18, the lower end device 33c includes a lower light passage surface 34c, a light projector 36c, and a light guide 40.

The projector 36c includes a mounting portion 62, a mold 63, a substrate 64, and a light source 65. For example, the light projector 36c is provided in the other direction of the door shoe 2.

The mounting portion 62 is provided in the other direction of the door shoe 2. One end of the mounting portion 62 is connected to the rear edge 2b.

For example, the cross section of the mold 63 has a line-symmetrical shape in the horizontal direction.

The mold 63 is disposed in the other direction of the door shoe 2. The side surface of the mold 63 in the advancing direction is connected to the other end of the mounting portion 62.

For example, the substrate 64 includes a circuit for causing the light source 65 to emit light. The substrate 64 is disposed inside the mold 63.

The light source 65 is connected to the substrate 64. The light source 65 is controlled by the substrate 64 to emit light.

For example, the light guide 40 includes a lens 41 and a reflecting member 42. The light guide 40 is provided on the side of the door shoe 2 in the ascending direction. One end of the light guide 40 is connected to the lower light passing surface 34c. The other end of the light guide 40 is connected to the light projector 36c.

The lens 41 is, for example, a convex lens. The lens 41 is disposed such that the convex surface faces the light projector 36c. For example, the optical axis of the lens 41 is set to coincide with the optical axis 50. For example, the lens 41 is disposed so that the focal point coincides with the light source of the projector 36c.

For example, the reflecting member 42 is provided on the side surface of the door shoe 2 in the other direction. For example, the end of the reflecting member 42 in the other direction faces the lens 41. For example, one end of the reflecting member 42 in one direction is connected to the lower light passage surface 34c. The reflecting member 42 is provided so that the optical axis 50 is emitted directly upward.

Next, a case where the safety device 100 detects the string 60 will be described with reference to fig. 19.

As shown in fig. 19, for example, when the car door 1a and the car door 1b perform a closing operation in a state where the rope 60 crosses an entrance of the car, not shown, the door shoe 2 comes into contact with the rope 60.

For example, the 2 nd shutter member 14 is in contact with the string 60. Therefore, the optical axis 50 is shielded by the 2 nd light shielding member 14 and the string 60. The optical axis 50 is not detected by the photodetector 35c not shown. The light receiver 35c transmits a detection signal indicating the presence of an obstacle to the controller 4, not shown.

According to embodiment 3,1 set of optical axis sensors 30c described above, the upper end device 31c and the lower end device 33c are provided. The upper end device 31c is provided at the upper end of the door shoe 2. The lower end device 33c is provided on the side surface of the door shoe 2 in the ascending direction. The 1 set of optical axis sensors 30c form a beam 50a between the upper end device 31c and the lower end device 33c. The 1 set of optical axis sensors 30c form a light beam 50a along the end face of the door shoe 2. Therefore, the safety device 100 can be provided with 1 set of the optical axis sensors 30c without replacing the door shoe 2. As a result, the safety device 100 for an elevator door can form the light beam 50a using the existing door shoe 2. The safety device 100 can be provided with 1 set of the optical axis sensor 30c at low cost.

The upper end device 31c includes a light receiver 35c. The lower end device 33c includes a projector 36c. The 1 set of optical axis sensors 30c form a light beam 50a and an optical axis 50 from the lower end device 33c towards the upper end device 31 c. Therefore, the light flux 50a converges as going downward. As a result, the safety device 100 can improve the detection capability of the obstacle existing below.

The lower end device 33c includes a light guide 40. The light guide 40 changes the light flux 50a from the horizontal direction to the vertically upward direction. Therefore, the lower end device 33c can set the light projector 36c at a position not directly below the light receiver 35c.

The 2 nd light blocking member 14 is provided on the side surface of the door shoe 2 in the ascending direction. The 2 nd light shielding member 14 is provided to shield a part of the optical axis 50. Therefore, the safety device 100 can improve the detection accuracy of the string 60 contacting the door shoe 2.

In embodiment 2 or embodiment 3, the safety device 100 can be applied regardless of the type of the car door. For example, the safety device 100 is used in an elevator of a single-door system, as in embodiment 1. For example, the safety device 100 is used in a double-door shoe type elevator.

In

embodiment

2 or 3, the lens 41 is not limited to a convex lens as long as it has a function of collimating the optical axis 50. The lens 41 is, for example, a collimator lens.

In

embodiment

2 or 3, the light guide 40 may not include the lens 41. For example, when the light projector 36c includes a highly directional light source, the light guide 40 does not include the lens 41. Specifically, the highly directional light source is a light source using a shell-type LED element, a laser light source, or the like.

Industrial applicability

As described above, the safety device for an elevator door of the present invention can be used in a system of an elevator.

Description of the reference symbols

1a, 1b, 1c: a car door; 2: a door boot; 2a: a leading edge; 2b: a trailing edge; 3: a multi-optical axis sensor light receptor; 4: a controller; 5: a door shield; 10: the 1 st light shielding member; 11: a 1 st antireflection member; 12: a 2 nd antireflection member; 13: a guiding aid; 14: the 2 nd light shielding member; 30a, 30b, 30c: an optical axis sensor; 31a, 31b, 31c: an upper end device; 32a, 32c: an upper light passing face; 33a, 33b, 33c: a lower end device; 34a, 34b, 34c: a lower light passing surface; 35a, 35b, 35c: a light receptor; 36a, 36b, 36c: a light projector; 37a: a reflector; 40: a light guide; 41: a lens; 42: a reflective member; 42a: a prism; 43: a prism with a lens curved surface; 43a: a curved surface; 43b: an exit surface; 50: an optical axis; 51: 1 st stray light part; 52: a 2 nd stray light part; 53: a reflection optical axis; 60: a rope; 61: garbage; 62: an installation part; 63: a mold; 64: a substrate; 65: a light source; 100: a safety device.

Claims

1. A safety device for an elevator door, comprising:

an upper end device arranged at the upper end of a door shoe arranged at the No. 1 car door of the elevator; and

a lower end device provided at a lower end of the door shoe, forming a light beam between the upper end device and the door shoe along an end surface of the door shoe,

the lower end device includes a lower light passage surface that passes the light flux and is provided to be inclined downward as being distant from the door shoe.

2. The safety device for elevator doors according to claim 1,

the upper end device is provided with a light receiver for receiving the light beam or a light projector for sending the light beam,

the lower end device is provided with the light projector or the light receiver.

3. The safety device of elevator doors according to claim 1,

the upper end device is provided with a projector for transmitting the light beam and a light receiver for receiving the light beam,

the lower end device is provided with a reflector which reflects the light beam upwards.

4. The safety device of elevator doors according to any one of claims 1 to 3,

the upper end device and the lower end device are detachably provided to the door shoe.

5. The safety device of elevator doors according to any one of claims 1 to 4,

the safety device for an elevator door comprises:

a multi-optical axis sensor projector provided to the door shoe; and

and a multi-optical axis sensor light receiver disposed to face the multi-optical axis sensor light projector.

6. The safety device of elevator doors according to any of claims 1 to 5,

the safety device of the elevator door is provided with a 1 st light shielding part, and the 1 st light shielding part is arranged on the front edge of the door boot and shields a part of the light beam.

7. The safety device of elevator doors according to any one of claims 1 to 6,

the safety device of the elevator door is provided with a 1 st anti-reflection component, and the 1 st anti-reflection component is arranged on the side surface in the direction of the inside of the elevator car in a 2 nd car door opposite to the 1 st car door.

8. The safety device of elevator doors according to any one of claims 1 to 7,

the safety device of the elevator door is provided with a 2 nd anti-reflection component, and the 2 nd anti-reflection component is arranged at a 2 nd car door opposite to the 1 st car door or a door stop opposite to the 1 st car door and opposite to the door shoe.

9. The safety device of elevator doors according to any one of claims 1 to 8,

the safety device of the elevator door is provided with a guide auxiliary tool which is provided with an inclined surface and is arranged at the lower end of a 2 nd car door opposite to the 1 st car door or the lower end of a door stop opposite to the 1 st car door in a manner that the inclined surface inclines downwards along with approaching the 1 st car door.