KR102121656B1 - Safety walking system for crosswalk - Google Patents

Abstract

The present invention relates to a pedestrian crossing safety walking system, and more specifically, a pedestrian or driver visually strongly alerts the pedestrian or driver inadvertently or inadvertently in an inadvertent situation, and physically controls the pedestrian crossing within the pedestrian crossing. It is related to a pedestrian crossing safety walking system that prevents safety accidents more reliably, provides various information to pedestrians around pedestrian crossings, and also exerts public/commercial advertising effects.

Description

Crosswalk safety walking system {SAFETY WALKING SYSTEM FOR CROSSWALK}

The present invention relates to a pedestrian crossing safety walking system, and more specifically, a pedestrian or driver visually strongly alerts the pedestrian or driver inadvertently or inadvertently in an inadvertent situation, and physically controls the pedestrian crossing within the pedestrian crossing. It is related to a pedestrian crossing safety walking system that prevents safety accidents more reliably, provides various information to pedestrians around pedestrian crossings, and also exerts public/commercial advertising effects.

In general, pedestrian traffic lights and vehicle traffic lights are installed around most pedestrian crossings to control the movement of pedestrians and vehicles, and accidents often occur at pedestrian crossings and surroundings.

This is due to various factors such as negligence of the pedestrian, negligence of the driver, lack of order, traffic congestion, road structure, or traffic signal system problems. For example, in the case of pedestrians, they try to cross in a hurry before turning to a green signal or red. Even after changing to a signal, there are cases of crossing without permission, and accidents may occur due to the unexpected behavior of children with insufficient attention, especially at pedestrian crossings located in children's sanctuaries such as the school zone.

In addition, in the case of a vehicle, even if a pedestrian remains on the pedestrian crossing, the vehicle may continue to drive as soon as the green signal changes, or may pass excessively at the moment when the pedestrian turns into a red signal. Even a vehicle was stopped to come in contact with a pedestrian crossing, which caused traffic accidents such as interfering with traffic, or causing inconvenience to traffic.

On the other hand, according to the statistics of the Seoul Metropolitan Government, more than 50% of the fatalities of traffic accidents are caused by accidents between vehicles and pedestrians, and the safety of pedestrians is a serious condition. In addition, accidents due to driver's failure to drive safely were also the most significant.

More specifically, in the case of general roads, more accidents occurred on general roads over five lanes with high traffic speed, and most of the pedestrian deaths on the general roads over five lanes were caused by unauthorized crossing of pedestrians. In the following general roads, it was found that the accident rate due to the driver's failure to drive safely was higher.

Accordingly, various types of traffic light auxiliary devices are installed around the pedestrian crossing to prepare for safety accidents in advance, such as a voice guidance device that alerts pedestrians to step back into the safety line without excessive access to the road. In addition to stepless crossing, countermeasures against driver's safety accidents will be essential.

To this end, like the pedestrian crossing safety walking system of Korean Patent Registration No. 1810662, both sides of the crosswalk are configured to irradiate laser beams in the direction parallel to the road direction or in the direction of pedestrian traffic to recognize whether the vehicle driver or pedestrian is proceeding or stopping. Or, as in the pedestrian crossing system for pedestrian protection of Korean Patent Registration No. 1532554, the height of the roadway and pedestrian crossing block is different so that the vehicle slows down near the pedestrian crossing or obeys the temporary duty. Prior art has been disclosed to generate a signal to a driver to be recognized so as to prevent a traffic accident.

However, these prior arts have an effect of preventing an accident by limiting the behavior of a pedestrian or a vehicle driver, but as a driver or a pedestrian, such as stopping walking or driving on their own, to control their behavior, There was a lack of control over pedestrians or drivers who are very inattentive, such as being distracted from the mobile phone or chatting with a party, or controlling pedestrians or drivers with low order awareness without looking around, and also conventional walking safety devices It has only the function to prevent safety accidents.

Pedestrian crossing safety walking system interlocked with traffic lights of Korean Patent Registration No. 1810662 (Dec. 13, 2017) Pedestrian crossing system for pedestrian protection of Korean Patent Registration No. 1532554 (2015.06.24)

The present invention has been invented to solve the above problems, and allows pedestrians and vehicles passing through a pedestrian crossing to have a visual alert and physically block indiscriminate entry to further prevent safety accidents. It is to provide a pedestrian safety walking system.

In addition, the present invention is to allow pedestrians to expose various forms of public and commercial advertisements while waiting at a pedestrian crossing and to transmit various beneficial information.

In order to achieve the above object, the pedestrian crossing safety walking system according to the present invention includes a pillar installed on both right and left sides of a pedestrian crossing ramp; Horizontal members installed in the horizontal direction on the upper left and right sides; Blocking unit is installed to be elevated on the prop to control the movement of the pedestrian; A driving unit driving the blocking unit; A sensing unit that detects the movement of a pedestrian or vehicle; And a control unit installed inside the prop and operating a blocking unit by applying a control signal to the driving unit by the movement of a pedestrian or vehicle detected by the detection unit.

Here, the blocking portion is installed horizontally between the left and right side posts and includes a pedestrian blocking portion that allows or blocks pedestrians to enter or descend while moving up and down. Or it may further include; a vehicle blocking unit to block.

In addition, the safety walking system according to the present invention includes a display unit installed on at least one of the posts or horizontal members, and the display unit includes an advertising member displaying a message transmitted to a pedestrian, and in addition, a walking signal is changed A remaining time display member for displaying remaining remaining time is further provided.

The display unit may be installed on at least one of the front, rear, and side surfaces of the strut, or may be installed on at least one of the front or rear surfaces of the horizontal member, or may be installed on all of them.

At this time, the display unit may guide the pedestrian to walk with voice guidance or text without displaying the remaining time on the remaining time display member 3 to 5 seconds before the signal change.

In addition, the pedestrian blocking portion includes a rope that is installed in the interior of both posts, and an X-shaped telescopic bar is continuously connected in the vertical direction to be installed and expandable in the vertical direction. It is characterized by.

As described above, according to the pedestrian crossing safety walking system of the present invention, it interlocks with a traffic light to open or block the front of a pedestrian and a vehicle depending on the situation, that is, a vertically elevated pedestrian block and optionally vertically there By installing a revolving vehicle blocker, it is possible to further strengthen the prevention of safety accidents by reliably controlling the unauthorized crossing of pedestrians and unauthorized entry of vehicles, and also promote various traffic safety to pedestrians or pedestrians passing by at pedestrian crossings. By exposing phrases or commercial/public interest advertisements, you can not only increase your safety awareness, but also obtain various useful information, as well as prevent illegal parking of vehicles on pedestrian crossings or sidewalks. It has the advantage that it does not interfere with smooth passage.

1 is a front view schematically showing a blocked state of a pedestrian crossing safety walking system according to the present invention;
FIG. 2 is a partially enlarged view of the blocking unit of FIG. 1.
Figure 3 is a front view schematically showing the open state of the safety walking system of the present invention
Figure 4 is a perspective view schematically showing the operating state of the pedestrian blocker of the present invention
Figure 5 is a perspective view schematically showing a driving unit for driving the pedestrian blocker of Figure 4
Figure 6 is a perspective view schematically showing the operating state of the vehicle blocker of the present invention
7 is a block diagram of a safety walking system according to the present invention
8 and 9 is a flow chart showing the operating state of the safety walking system according to the present invention

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings so that those skilled in the art to which the present invention pertains can easily practice the technical spirit of the present invention. However, the present invention may be implemented in various different forms and is not limited to the embodiments described herein.

1 is a front view schematically showing a blocked state of the pedestrian crossing safety walking system according to the present invention, FIG. 2 is a partially enlarged view of the blocking part of FIG. 1, and FIG. 3 is an open state of the safety walking system of the present invention Figure 4 is a front view schematically showing, Figure 4 is a perspective view schematically showing the operating state of the pedestrian blocker of the present invention, Figure 5 is a perspective view schematically showing a driving unit for driving the pedestrian blocker of Figure 4, Figure 6 is It is a perspective view schematically showing the operating state of the vehicle blocking unit of the present invention, FIG. 7 is a block diagram of a safety walking system according to the present invention, and FIGS. 8 and 9 show an operating state of the safety walking system according to the present invention It is a flow chart. In the drawing, WSD refers to Wired Safety Door.

According to the drawings, the pedestrian crossing safety walking system (S) of the present invention, the support 10 is installed on both sides of the pedestrian crossing ramp; A blocking unit 30 rotatably installed on a prop to control movement of a pedestrian or a vehicle; A driving unit 40 driving the blocking unit; A sensing unit 50 that detects the movement of a pedestrian or vehicle; And a control unit 60 applying a control signal to the driving unit to raise or lower the blocking unit.

This will be described in detail as follows.

1 and 3, the support 10 is made of steel, has a predetermined height, and is installed upright on both sides of a pedestrian crossing ramp. These props 10 are respectively installed on the crosswalk entry paths (both sides of the sidewalk where crosswalks are installed) facing each other.

The post 10 serves to support the blocking portion as well as the driving portion, which will be described later, is installed therein.

To this end, a space in which the driving unit can be installed is formed in the holding column, and a sliding groove (not shown) is vertically and vertically formed on the inner surface to induce a stable lifting in a state in which a part of the pedestrian blocking unit is supported and coupled, so that the pedestrian blocking unit is elevated. It plays a supporting role.

At this time, the pedestrian traffic light may be installed on the side of the prop (10).

The horizontal members 20 are installed in the horizontal direction on the upper sides of the left and right side posts 10.

The horizontal member 20 has a length equal to the distance between the posts and posts located on the left and right side of the crosswalk and is formed at a predetermined height (thickness).

A fixed frame 21 may be installed on the horizontal member to prevent the rise of the lift by fixing the upper portion of the lifter of the pedestrian blocker, which will be described later, and the fixed frame may be installed on the strut 10 rather than the horizontal member. .

The support 10 and the horizontal member 20 may be provided with a display unit, a detailed description thereof will be described later.

The blocking unit 30 is installed to be supported on the prop and controls pedestrian entry, and is operated in conjunction with a pedestrian traffic light, and the blocking unit includes a vertical pedestrian-type pedestrian blocking unit 31.

Pedestrian block 31 is installed horizontally between the left and right side posts to allow or block the entry of pedestrians while moving up and down, between the lifting lift 311 and the two lifting lifts respectively installed inside the two posts 10 It includes a rope 312 connected to the horizontal direction.

The pedestrian blocker 31 may be applied to a structure made of the same structure as the stretchable shutter of the applicant's patent application No. 2016-123881 or the stretch frame of 2018-21796.

That is, as shown in FIG. 2, the lifting lift 311 is a bellows type and is used such that the X-type expansion and contraction bars, which are vertically connected to each other, are folded upward or unfolded downward.

In more detail with respect to the lifting lift 311, a pair of bars having a predetermined length are fastened in an X-shape with respect to the central axis, and these X-shaped telescopic bars are continuously connected in the vertical direction and installed vertically. It is configured to be stretchable, and the left and right lower ends of the X-shaped stretch bars located on the upper side, the upper left and right upper ends of the X-shaped stretch bars located on the lower side are respectively axially coupled and installed in a rhombus shape. It is axially rotated by the lifting means to be described later is folded upward or unfolded downward.

The rope 312 is connected horizontally between the two lifting shafts 311 to open or block the front of the pedestrian as the vertical movement and spacing are extended and contracted by the expansion and contraction of the lifting lift.

At this time, the X-shaped telescopic bar is formed to be the same as the overall size of a pedestrian that does not cross the rope or the rope, or only the size of the X-shaped telescopic bar located at the top is large to increase or decrease the degree of expansion and contraction of the lift (folded) By expanding the spreading width), when the elevator lift is completely folded, the overall vertical length can be shortened, so that the height between the horizontal member and the pedestrian can be secured to some extent.

However, the lifting lift 311 is not limited to the above-described form, and any number of ropes 312 are driven to be able to move up and down to allow or block pedestrians from entering the pedestrian crossing in a horizontally arranged state. It can also take the form.

In addition, the blocking unit 30 further includes a vertically rotating vehicle blocking unit 32 to control the entry of the vehicle.

Vehicle block 32 is installed on each of the left and right posts to allow or block the entry of the vehicle while rotating vertically, as shown in Figures 4 and 6 is installed on the side of both posts (10) to support the posts It includes a rotating bar 321 that rotates 90° in the axis, and further includes a blocking plate 322 coupled to the distal end of the rotating bar.

The rotation bar 321 is formed in a predetermined length and the front end of the vehicle is opened while rotating at 90° to form a parallel (vertical) or right angle (horizontal) to the post in a state where one end is rotatably coupled to the post 10 Or it is to be blocked, the vehicle driver can easily recognize whether or not the walking signal by looking at the traffic light by the rotating bar 321.

The other end portion of the rotating bar 321 is attached to a blocking plate 322 of a predetermined size to notify the vehicle from entering, so that the vehicle driver can more reliably recognize that it is a walking signal and stop driving. Characters such as "stop" and "STOP" can be displayed.

The blocking unit 30 having such a configuration operates in conjunction with a traffic light, but operates the safety of pedestrians as the highest priority based on the danger signal of the detection unit described later.

In addition, although the pedestrian blocking unit 31 and the vehicle blocking unit 32 may be operated at the same time in connection with the traffic lights, the blocking units may be individually operated independently depending on the situation around the pedestrian crossing.

In addition, a locking means including a locking member 35 for maintaining the open or blocked state of the blocking unit 30 may be further provided.

That is, the locking means is installed on the support 10, a plurality of ropes (312) constituting the pedestrian blocking portion 31 is narrowed or as the gap is narrowed or lowered, the part of the lifting lift (311) is fixed to be fixed. It can be fixed on the support or detachable.

In addition, the locking means can be fixed to the upper portion of the rotating bar to be coupled or detachable on the support so that the raised state is fixed so that the rotating bar 321 constituting the vehicle blocking portion 32 is parallel to the support.

Since the locking means is not a necessary component in the present invention, detailed description will be omitted.

The driving unit 40 is installed inside the prop to provide a driving force such that the pedestrian blocking unit or the vehicle blocking unit is elevated or rotated.

The driving unit includes a motor, and receives a blocking control signal by a control unit described later to operate the blocking unit.

At this time, when specifically illustrating the configuration of the driving unit for driving the pedestrian blocking unit to be elevated, as shown in FIG. 5, the lifting member 45 for elevating the elevating lift 311 to be folded or unfolded, and the elevating member for elevating the elevating member Means.

The elevating member 45 has a predetermined length in the horizontal direction, and one end thereof is coupled to the elevating lift 311 and the other end is fastened to the elevating body, which will be described later, while the elevating lift expands and contracts by moving up and down. It is to narrow or to widen.

The lifting means includes a driving motor 41, a screw 42, and a lifting body 43 equipped with a cam portion.

The driving motor 41 is installed on a prop to rotate the screw in a rotating form to provide power for the pedestrian blocking unit 31 to move up and down, and such a driving motor is always rotated while rotating the screw 42 in the forward and reverse directions. In order to transmit a certain power to the screw, an encoder may be installed in conjunction, and the power and speed of the motor may be adjusted through the encoder.

The screw 42 is installed long in the vertical direction on the support and is rotated in the forward and reverse direction by the drive motor.

The lifting body 43 is mounted on the screw to be raised or lowered by rotation of the screw, and is provided with a cam portion.

The cam portion 43a is formed such that a part of the portion protrudes more than the other portion, and the lifting body 43 moves up and down according to the rotation of the screw while the other end portion 45a of the elevating member is coupled to the cam portion.

That is, the cam portion 43a is rotated together with the elevating body by rotation of the screw 42, and when the protruding portion of the cam portion is caught by the other end portion 45a of the elevating member when the elevating body 43 is rotated The body is prevented from further rotation and is raised or lowered along the screw 320.

The driving unit for lifting the pedestrian blocking unit as described above is not limited to the above-described configuration.

The detection unit 50 is installed adjacent to a prop or a pedestrian crossing to detect the movement state of a pedestrian or a vehicle, detects the movement of a pedestrian or a vehicle within a certain distance from the pedestrian or pedestrian crossing, and detects the pedestrian Or, the movement of the vehicle is transmitted to the control unit.

The detection unit 50 detects the movement of a pedestrian and transmits the data to the control unit (first control unit), the first sensor 51 and the vehicle to detect the movement and transmit the data to the control unit (second control unit) It includes a 2 sensor 52, the first sensor 51 detects whether the pedestrian has entered the pedestrian crossing, and the second sensor 52 detects whether the vehicle has entered the pedestrian crossing within a certain distance. .

In addition, the detection unit 50 may include a CCTV installed in a strut or horizontal member to prevent damage and monitor the damage of the walking system or surrounding facilities according to the present invention.

The control unit 60 is installed inside the prop and generates a control signal to control the driving unit, and operates a blocking unit by applying a control signal to the driving unit 40 by motion data of a pedestrian or vehicle detected by the sensing unit 50 Order.

The control unit 60 is connected to the first sensor, the first control unit for controlling the elevation of the pedestrian blocking unit 31 and the rotational movement of the vehicle blocking unit 32 by the movement data of the pedestrian transmitted by the first sensor (61) and a second control unit (62) installed in connection with the second sensor and controlling rotation of the vehicle blocking unit (32) and moving movement of the pedestrian blocking unit (31) by movement data of the vehicle transmitted by the second sensor ).

At this time, the control unit 60 may control the driving unit 40 to hold the operation of the blocking unit 30 even if the signal changes when the movement of the pedestrian or vehicle is detected by the sensing unit.

For example, even when the walking signal is turned on, the pedestrian blocking unit 31 may not be opened when the speed of the vehicle does not decrease and the movement of the vehicle approaching the pedestrian crossing is detected. Accordingly, the vehicle blocking unit 32 may Even if it is not operated due to a malfunction, it is possible to secure pedestrian safety in the pedestrian blocking unit 31 in advance.

On the other hand, when the vehicle signal is turned on, when the movement of a pedestrian who has not passed the pedestrian crossing is detected, the pedestrian blocking unit 31 is kept open until the pedestrian crosses safely and the vehicle blocking unit 32 is opened. To hold.

At the same time, it is controlled to hold the change of the vehicle traffic light from the red signal to the green signal and change it to the yellow signal.

The control unit 60 may be configured as a control box.

In addition, the control unit 60 is electrically connected to the driving unit 40 and the sensing unit 50 and a display unit to be described later.

The display unit 70 includes an advertisement member 71 installed on a prop and/or a horizontal member to display a message transmitted to a pedestrian, and the display unit displays messages such as guidance, publicity, and advertisement by the control unit 60. It is controlled to display.

The advertisement member 71 may be installed by dividing the support member and/or the horizontal member, preferably the horizontal member 20. As a message constituting the advertisement member 71, guidance and caution statements for safety Or, various publicity advertisements, publicity advertisements to promote campaigns such as the environment or smoking cessation, news from locations such as municipalities, election-related public relations, commercial advertisements such as academies, kindergartens, and hospitals in nearby areas where crosswalks are installed. The message for can be selectively displayed through means such as letters, numbers, and shapes.

For example, various advertisement phrases are attached to the front and rear of the horizontal member 20 so that pedestrians waiting for a pedestrian crossing can be exposed to expose such phrases while waiting for the signal to change, or the prop 10 By expressing the phrase "in the middle of CCTV shooting" on the front of the screen, it is possible to block the pedestrian's crosswalk hearing or desire, or to prevent vandalism or other crimes.

The display unit 70 includes a signal period remaining time display member 72 indicating the time remaining until the gait signal is changed from a green signal to a red signal in a number or figure, and the remaining time display member 72 is a display It is installed in a predetermined position of the unit, but is preferably positioned at the center of the display unit installed on the horizontal member 20 or at one side of the left and right sides, more preferably at the center.

The remaining time display member 72 may be used as a part of the advertisement screen of the display unit, or may be installed separately from the pillar 10 or the horizontal member 20.

In addition, the remaining time display member 72 may be installed on the front side (the side where the pedestrian's gaze touches) as well as the rear side (the side where the pedestrian's gaze stands across the sidewalk) of the strut or horizontal member, and accordingly, the crosswalk Pedestrians standing right in front of the driveway can check through the remaining time display member 72' installed on the other side of the pedestrian crossing without intentionally raising the head to check the remaining time.

The display unit 70 may be provided with a setting key that allows a user, such as a traffic police, to arbitrarily set the remaining time according to a situation that occurs around a pedestrian crossing, and the driving unit as the setting signal operated by the setting key is transmitted to the control unit You can control the driving.

In addition, when the blocking unit 30 cannot operate in conjunction with a traffic light, a green or red signal may be detected by a separately installed camera device (not shown) and the signal change time may be counted down.

At this time, the control unit 60 stops the countdown of the remaining time displayed on the remaining time display member 72 of the display unit in advance, preferably 3 to 5 seconds before the signal is changed, and no longer displays the remaining time. .

In addition, instead of displaying the remaining time on the remaining time display member 72, a voice guidance such as "The signal will be changed soon", "Please look around and do not perform information", or display it as a text on the display section 70 You may.

Accordingly, it is possible to correct the operation time error of the tip end which may occur by predicting the remaining time of the pedestrian, restraining the action to cross the pedestrian crossing prematurely, and not interlocking with the traffic light.

The display unit 70 is installed on at least one of the front or rear or side of the prop and/or the front or rear of the horizontal member, in particular, it can be installed on the front (face facing the pedestrian) or both. , The LED module may be used for the display unit.

The safety walking system configured as described above can be installed on any pedestrian crossing, but is particularly preferably applied to a child protection zone, an accident-prone zone, a general road of 5 lanes or more.

In addition, as shown in FIGS. 8 and 9, the pedestrian crossing safety walking system according to the present invention may be automatically executed or manually operated according to the surrounding environment.

For example, when there is no traffic light around the pedestrian crossing, or during the middle of the night, when the yellow signal flashes, or when the teacher directs children in front of the kindergarten, it is preferable to manually operate it.

10: prop 20: horizontal member
21: fixed frame 30: block
31: pedestrian block 311: lifting lift
312: Rope 32: Vehicle block
321: rotating bar 322: blocking plate
40: drive unit 41: drive motor
42: screw 43: lifting body
43a: cam portion 45: lifting member
50: detection unit 51: first sensor
52: second sensor 60: control unit
61: first control unit 62: second control unit
70: display unit 71: no advertising
72: Remaining time display member

Claims (10)

Posts (10) installed on both sides of the pedestrian crossing driveway;
A horizontal member 20 installed in the horizontal direction on the left and right sides of the posts;
Blocking unit 30, which is installed horizontally between the left and right posts, and includes a pedestrian blocking unit 31 that allows or blocks pedestrians to enter or descend while moving up and down;
A driving unit 40 driving the blocking unit;
A sensing unit 50 that detects the movement of a pedestrian or vehicle; And
It is installed inside the prop and the control unit is applied to the driving unit by the movement of the pedestrian or vehicle detected by the detection unit to operate the blocking unit, but if the movement of the pedestrian or vehicle is detected by the detection unit, the blocking unit 30 Includes; control unit 60 for controlling the drive unit 40 to hold the operation of;
The pedestrian blocking unit 31 is installed inside each of the two pillars 10, and X-shaped telescopic bars are continuously connected in the vertical direction to be installed to be stretched in the vertical direction. It includes a rope 312 connected in the horizontal direction between the installation,
The driving unit 40 includes a lifting member 45 for elevating the lifting lift 311 to be folded or unfolded, and a lifting means for elevating the lifting member. Sidewalk safety walking system. According to claim 1,
It includes a display unit 70 that is installed on at least one of the support 10 or the horizontal member 20,
The display unit is provided with an advertising member (71) for displaying a message delivered to the pedestrian, wherein the message is selected from among traffic safety or state phrases, public service announcements, news of the municipality location, election-related public relations, commercial advertising Sidewalk safety walking system. According to claim 2,
The display unit 70 further comprises a remaining time display member 72 for displaying the remaining time that the walking signal is changed, the pedestrian crossing safety walking system. According to claim 3,
The display section 70 is a pedestrian crossing safety walking system, characterized in that installed on at least one of the front or rear or side of the prop or at least one of the front or rear of the horizontal member. According to claim 1,
The blocking unit 30 is installed on each of the left and right posts, respectively, while vertically rotating, the vehicle blocking unit 32 to allow or block the entry of the vehicle; a pedestrian crossing safety walking system further comprising. According to claim 1,
The detection unit 50 is a pedestrian crossing safety walking system, characterized in that it comprises a CCTV installed on the prop (10) or horizontal member (20) to monitor the movement of pedestrians or vehicles, damage to surrounding facilities, crime prevention. The method of claim 4,
The display unit 70 is a pedestrian crossing safe walking system, characterized in that to guide the pedestrian by voice guidance or text without displaying the remaining time on the remaining time display member 72 3 to 5 seconds before the signal change. delete delete According to claim 1,
The elevating means is a screw 42 that is installed in the vertical direction long in the prop and rotated in the normal direction; A drive motor 41 installed on the prop to provide power to rotate the screw; And a lifting body 43 mounted on the screw and raised or lowered by rotation of the screw.

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