KR101225995B1 - Device for opening and closing covers of windows - Google Patents

Abstract

A window cover opening and closing device is disclosed. Window cover opening and closing device according to an embodiment of the present invention, a plurality of fasteners that are each detachably coupled to the lower side of the plurality of window covers, a lifting bar, a plurality of fasteners are coupled in a row along the longitudinal direction, once in the lifting bar A plurality of flexible linear members coupled to each other, a reel shaft having the other side of the plurality of flexible linear members respectively coupled to the outer circumferential surface, and a plurality of flexible linear members wound around the outer circumferential surface of the reel shaft by rotating the reel shaft in one direction or the other direction. The lifting bar may be moved upwards or downwards as the plurality of flexible leading members are wound or unwound on the outer circumferential surface of the reel shaft so that the plurality of window covers may be opened or closed at one time.

Description

Window cover opening and closing device {DEVICE FOR OPENING AND CLOSING COVERS OF WINDOWS}

The present invention relates to a window cover opening and closing device, and more particularly, to an apparatus for simultaneously opening or closing a window cover respectively installed in a plurality of windows.

Leisure vessels, such as cruise ships and cruise boats, may be provided with a marina platform in which a portion of the hull is opened to allow passengers to enjoy the water.

1 and 2 illustrate a marina platform provided at the stern of the cruise ship. 1 illustrates a state in which the marina platform 20 provided at the stern portion of the hull 10 of the cruise ship 1 is opened, and in FIG. 2, the state in which the marina platform 20 is closed is illustrated.

When the weather is good and the cruise ship 1 is anchored at a certain position, as shown in FIG. 1, the marina platform 20 may be opened to allow passengers to enjoy playing in the water.

When the cruise ship 1 is sailing to move to a destination or the place where the cruise ship 1 is anchored is a dangerous sea, or when the weather condition is not good, the marina platform 20 as illustrated in FIG. Can be closed.

Marina platform 20 may be provided with a plurality of windows 21 as shown. The plurality of windows 21 may be used to allow passengers to view the exterior of the hull 10 when the marina platform 20 is closed, or to increase the illumination in the hull 10 by mining.

By the way, when the cruise ship 1 is navigating the sea or when the height is high, since the seawater may flow into the hull 10 through the window 21, the window 21 should be closed.

Accordingly, a plurality of window covers (not shown) may be installed in the plurality of windows 21 to open and close the windows 21. Since the window cover (not shown) is large in size and difficult to directly open and close by manpower, a device for opening and closing the window cover (not shown) may be installed at the stern portion of the hull 10.

At this time, if a device for opening and closing a plurality of window covers (not shown) are respectively installed, the space occupied by the device in the hull 10 may be increased, and the cost of the load and the installation may also be increased. .

Embodiments of the present invention are intended to open and close a plurality of window covers at a time by one window cover opening and closing device, and to minimize the space and load occupied by the window cover opening and closing device.

According to an aspect of the present invention, a window cover opening and closing device for opening and closing a plurality of window covers, each of which is coupled to the upper edge of the plurality of windows arranged in a row rotatably, separated on the lower side of the plurality of window covers A plurality of fasteners coupled to each other, a lifting bar having the plurality of fasteners coupled in a line along a longitudinal direction, a plurality of flexible linear members having one end coupled to the lifting bar, and the plurality of flexible linear members A reel shaft, the other side of which is coupled to an outer circumferential surface thereof, and a motor for rotating the reel shaft in one direction or the other direction so that the plurality of flexible linear members are wound or unwound on the outer circumferential surface of the reel shaft; As the member is wound or unwound on the outer circumferential surface of the reel shaft, the lifting bar is moved upward or downward to Window cover for a can has a window cover opening and closing device, it characterized in that the open or close at a time can be provided.

In the window opening and closing device, the reel shaft includes a plurality of spline portions formed on at least two portions of an outer circumferential surface of the reel shaft, a plurality of moving winding portions respectively slidably coupled to the plurality of spline portions, and the plurality of movement windings. And a plurality of pin supports disposed close to the outer circumferential surface of the mounting portion, wherein the outer circumferential surface of the movable winding portion has a spiral winding groove having a pitch corresponding to the diameter of the flexible linear member and a spiral having a pitch corresponding to the winding groove. Guide grooves are formed in each of the guide pins are formed in the pin support so that the end is inserted into the guide groove, the movable winding portion is rotated in accordance with the rotation of the reel shaft is wound around the flexible linear member Or unwinding, the movement winding unit may be moved in one direction or the other direction along the longitudinal direction of the reel shaft. There.

In this case, the flexible linear member may be any one of a chain, a wire rope, and a steel wire.

Or, in the window cover opening and closing device, the flexible linear member is a strap made of any one of metal, leather and synthetic resin, the reel shaft is formed with a winding groove having a width corresponding to the width of the reel shaft of the reel shaft According to rotation, the strap may be wound or unwound in the winding groove.

The window opening and closing device as described above may further include a plurality of opening and closing detection sensors respectively installed at edge portions of the plurality of windows or edge portions of the plurality of window covers to respectively detect whether the plurality of window covers are opened or closed. have.

The apparatus may further include a plurality of opening angle detection sensors respectively installed at upper edge portions of the plurality of windows to detect an opening angle of the plurality of window covers.

In addition, the plurality of fasteners and the lifting bar may be interposed between each of the plurality of fasteners and the lifting bar may further include a plurality of spacing adjusting screws for adjusting each.

Embodiments of the present invention can save the space occupied by the window cover opening and closing device by reducing the space occupied by the window cover opening and closing device can be opened and closed at a time by a single window cover opening and closing device, the window The cost of installing the cover opening and closing device can be saved.

1 and 2 illustrate a marina platform provided at the stern of the cruise ship.
3 is a view showing a window cover opening and closing apparatus according to an embodiment of the present invention.
Figure 4 is a partial perspective view showing the main portion of the window cover opening and closing device shown in FIG.
5 is a cross-sectional view of the moving winding unit shown in FIG. 4.
Figure 6 is a partial perspective view showing the main portion of the window cover opening and closing apparatus according to another embodiment of the present invention.

BRIEF DESCRIPTION OF THE DRAWINGS The present invention is capable of various modifications and various embodiments, and specific embodiments are illustrated in the drawings and described in detail in the detailed description. It is to be understood, however, that the invention is not to be limited to the specific embodiments, but includes all modifications, equivalents, and alternatives falling within the spirit and scope of the invention. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, the present invention will be described in detail with reference to the accompanying drawings.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings.

Figure 3 schematically shows a window cover opening and closing apparatus according to an embodiment of the present invention. Here, FIG. 3 shows the marina platform 20 and the window cover opening and closing device 100 in the closed state as viewed from inside the hull 10.

As described above, the marina platform 20 is hinged to the hull 10 may be installed to open and close. A plurality of windows (21 of FIG. 2) provided in the marina platform 20 may be arranged in a line, a plurality of window covers 30 are provided inside the plurality of windows (21 of FIG. 2) to open and close them. Each can be installed.

The plurality of window covers 30 may be rotatably coupled to upper ends of the plurality of window covers 30 by hinges 31 provided at upper edges of the plurality of windows 21 of FIG. 2. Accordingly, the plurality of window covers 30 may be installed to close or open the inside of the plurality of windows (21 of FIG. 2) while the lower side thereof moves up and down about the hinge 31.

A lug 32 may be formed or attached to the lower side of the plurality of window covers 30, respectively. A corresponding number of fasteners 171 may be detachably coupled to the lugs 32, respectively. For reference, although not shown in detail, the fastener 171 may be a ring shape that is detachably coupled to the lug 32 such as a carabiner. For reference, separation and coupling of the fastener 171 and the lug 32 can be directly performed by an operator such as a crew member of the cruise ship (1).

The plurality of fasteners 171 may be coupled to one surface of the lifting bar 170 in a line along the longitudinal direction of the lifting bar 170.

One end of the plurality of flexible linear members 160 may be coupled to the other surface of the lifting bar 170, respectively. As the flexible linear member 160, a chain, a wire rope, or a steel wire may have a high flexibility but a small strain in the longitudinal direction.

The other side of the flexible linear member 160 may be coupled to the outer circumferential surface of the reel shaft 140. The reel shaft 140 may be rotatably supported at both ends by a reel shaft support 142 installed on the deck 11.

Here, in order to make the indoor environment inside the hull 10 beautiful, as shown, the lifting bar 170 of the window cover opening and closing device 100 is disposed below the deck 11, and the reel shaft 140 is the deck. It may be arranged above the (11). Therefore, the flexible linear member 160 may be disposed in a shape that penetrates through holes 12 and 12a formed in the deck 11, respectively.

The reel shaft 140 may be rotated in one direction or the other direction by receiving the rotational force of the motor 110. When the reel shaft 140 is rotated, the flexible linear members 160 and 160a may be wound or unwound on the outer circumferential surface of the reel shaft 140.

As the flexible linear members 160 and 160a are wound or unwound on the outer circumferential surface of the reel shaft, the lifting bar 170 may be moved upward or downward. In this case, since the plurality of fasteners 171 coupled to the lifting bar 170 are detachably coupled to the lugs 32 of the plurality of window covers 30, the plurality of fasteners 171 may be separated according to the vertical movement of the lifting bar 170. Window cover 30 may be opened or closed at a time.

Here, the term 'temporary' means 'a short period of time', and does not mean that the plurality of window covers 30 are opened or closed at the same time, but the plurality of window covers 30 are opened or closed. The minute time difference caused by a physical dimension error or the like at the moment is revealed to mean opening or closing within an acceptable time interval.

Therefore, the window cover opening and closing apparatus 100 according to an embodiment of the present invention may operate as the following example.

When the window cover 30 is to be opened, after the lifting bar 170 is sufficiently lowered, the crew couples the fastener 171 to the lug 32. Thereafter, when the lifting bar 170 is raised by operating the motor 110, the window cover 30 is rotated about the hinge 31 to open the window (21 in FIG. 2). If the motor 110 is stopped when the lifting bar 170 is sufficiently raised, the window cover 30 may be kept open.

When closing the window cover 30 in the open state, the lifting bar 170 is lowered to operate the motor 110 until the window cover 30 closes the window (21 in FIG. 2). When all the windows (21 in FIG. 2) are closed by the window cover 30, the crew releases the fastener 171 from the lug 32 after stopping the operation of the motor 110.

After the fastener 171 is separated from the lug 32, the lifting bar 170 may be shaken in the space inside the hull 10 by the shaking of the hull 10, thus operating the motor 110 to lift the lifting bar ( 170 may again be raised close to deck 11.

Here, the controller 180, the open / close detection sensor 181, and the open angle sensor 182 that have not been described will be described again with reference to FIG. 4.

FIG. 4 shows the main parts of the window cover opening and closing device shown in FIG. 3 in detail, and FIG. 5 shows a cross section of the moving winding shown in FIG. 4 and 5 will be described in more detail with respect to the window cover opening and closing apparatus according to an embodiment of the present invention.

4, the window cover opening and closing device 100 according to an embodiment of the present invention, the motor 110, the drive shaft 111, the coupling 120, the electric shaft 130, the worm 131, front Coaxial Support 132, Reel Shaft 140, Worm Wheel 141, Reel Shaft Support 142, Spline 144, Moving Reel 145, Pin Support 149, Flexible Linear Member 160, Lifting Bar 170, a fastener 171, a space adjusting screw 173, and a controller 180 may be included.

One side of the driving shaft 111 may be connected to the motor 110, and may be rotated in one direction or the other direction by the motor 110. One end of the transmission shaft 130 may be connected to the other side of the driving shaft 111 by the coupling 120. Coupling 120 may be used to transmit the rotational force even if the center of the drive shaft 111 and the transmission shaft 130 does not coincide, such as uniform coupling or universal coupling.

The other end of the transmission shaft 130 may be rotatably supported by a bearing 133 provided on the transmission shaft support 132. Although not shown in detail, the transmission shaft support 132 may be fixed to the deck (11 in Figure 3).

The transmission shaft 130 may be provided with a screw-shaped worm (131).

The reel shaft 140 may be disposed in a direction perpendicular to the transmission shaft 130, and a worm wheel 141 engaged with the worm 131 may be installed. Therefore, the rotational force of the motor 110 may be transmitted to the reel shaft 140 via the driving shaft 111 and the transmission shaft 130.

Here, although not shown, the arrangement of the motor 110 is changed as necessary so that the coupling 120 is directly connected to the reel shaft 140, or one end of the reel shaft 140 is directly connected to the motor 110. The rotational force of the motor 110 may be transmitted to the reel shaft 140.

One end of the reel shaft 140 may be rotatably supported by a bearing 143 provided on the reel shaft support 142. The other end of the reel shaft 140 may also be rotatably supported by a bearing (not shown) provided in the reel shaft support (142a of FIG. 3).

In this case, the reel shaft support 142 (142a of FIG. 3) may be fixed to the deck (11 of FIG. 3) as shown in FIG. 3.

A spline portion 144 may be formed on an outer circumferential surface of the reel shaft 140, and a movement winding portion 145 may be coupled to the spline portion 144 so as to be slidable. At this time, the movement winding unit 145 may receive the rotational force of the reel shaft 140 by the spline (spline) of the spline portion 144, the movement winding unit 145 may be rotated together with the reel shaft 140.

Spiral winding grooves 146 and spiral guide grooves 147 corresponding to the winding grooves 146 may be formed on the outer circumferential surface of the moving winding part 145, respectively. The pin support 149 may be disposed close to a portion where the guide groove 147 is formed among the outer circumferential surfaces of the movement winding unit 145. Pin support 149 may be secured to the deck (11 in Figure 3).

A guide pin 148 may protrude from an end of the pin support 149, and the guide pin 148 may be inserted into the guide groove 147. Therefore, when the motor 110 is operated and the reel shaft 140 is rotated, the movement winding unit 145 rotates while the guide pin 148 is fixed at a predetermined position, so that the movement winding unit 145 is the spline unit 144. The slide can be moved along. This will be described in more detail with reference to FIG. 5.

Referring to FIG. 5, the spiral winding groove 146 to which the flexible linear member 160 is wound or unwound may be formed to have a predetermined pitch Pa. Since the winding groove 146 is formed to uniformly wind the flexible linear member 160, the pitch Pa of the winding groove 146 is formed to correspond to the diameter D of the flexible linear member 160. Can be.

However, in order to uniformly wind or loosen the flexible linear member 160 in the winding groove 146, the flexible linear member 160 is rotated one time by the rotation of the winding unit 145 by the rotation of the spline unit 144. It should be possible to slide the diameter (D) of.

Therefore, the pitch Pb of the guide groove 147 which determines the length of the slide winding as the moving winding unit 145 rotates also has a pitch Pb corresponding to the diameter D of the flexible linear member 160. Can be formed. That is, the pitch Pa of the winding groove 146 and the pitch Pb of the guide groove 147 may both be formed to have a size corresponding to the diameter D of the flexible linear member 160.

Therefore, when the reel shaft (140 of FIG. 4) is rotated and the moving winding unit 145 is rotated so that the flexible linear member 160 is wound or unwound on its outer circumferential surface, the moving winding unit 145 is the spline unit 144. That is, it may be moved in one direction or the other direction along the longitudinal direction of the reel shaft 140.

Referring back to FIG. 4, as described above, one end of the flexible linear member 160 may be coupled to the other surface of the lifting bar 170 by passing through the through hole 12, and on one surface of the lifting bar 170. Fasteners 171 may be coupled.

In this case, a plurality of spacing adjusting screws 173 may be interposed between the plurality of fasteners 171 and the lifting bar 170. The space adjusting screw 173 may finely adjust the distance between both ends, such as a turn buckle, and the distance between the plurality of fasteners 171 and the lifting bar 170 by the space adjusting screw 173. Can be adjusted.

Therefore, when the plurality of window covers 30 of FIG. 3 are not opened or closed at one time due to a positional error such as a hinge 31 or a lug 32 coupled to the plurality of window covers 30 of FIG. By minimizing the influence of the above-described error by using the space adjusting screw 173, the window cover (30 of FIG. 3) can be opened and closed at one time.

Parts of the reel shaft 140, which are not shown in FIG. 4, are symmetrical or have the same structure around the wheel 141, and thus redundant descriptions thereof will be omitted. However, since the flexible linear member 160a disposed at a portion not shown in FIG. 4 is wound or unwound by the same length as the flexible linear member 160 according to the rotation of the reel shaft 140, the lifting bar 170 is The lifting bar 170 may be horizontal when moved upward or downward.

Therefore, since the deviation can be minimized when the plurality of window covers 30 (FIG. 3) are opened and closed, the window cover opening and closing apparatus 100 according to an embodiment of the present invention is a plurality of window covers (30 of FIG. 3) Can be opened or closed at a time.

Referring to FIG. 3 again, a plurality of opening and closing detection sensors 181 may be installed at edge portions of the window 21 of FIG. 2. The open / close detection sensor 181 detects whether the window cover 30 is opened or closed, and a contact sensor, a proximity sensor, a limit switch, or the like may be used.

The controller 180 may be electrically connected to the plurality of open / close detection sensors 181 to receive a signal generated by the open / close detection sensor 181, and the controller 180 may be connected to the motor 110 as illustrated in FIG. 4. It may be electrically connected to control the operation of the motor 110.

Therefore, when the control unit 180 detects that all the window covers 30 are closed when the plurality of window covers 30 are closed by the opening / closing sensor 181, the control unit 180 stops the motor 110 to lift the lifting bar 170. ) Can be prevented from falling further.

Although not shown, the opening and closing detection sensor 181 may be installed at the edge portion of the window cover 30.

On the other hand, a plurality of opening angle sensor 182 may be installed in the plurality of hinges 31 rotatably coupling the upper edge portion of the plurality of windows (21 in Figure 2) and the plurality of window covers 30, respectively. have.

The open angle sensor 182 is for detecting an angle at which the plurality of window covers 30 are opened, and an angle sensor may be used.

The controller 180 may be electrically connected to the plurality of open angle sensor 182 to receive a signal generated by the open angle sensor 182, and the controller 180 may include the motor 110 as illustrated in FIG. 4. It is electrically connected to) can control the operation of the motor (110).

Therefore, the controller 180 detects the degree of opening of the plurality of window covers 30 when the plurality of window covers 30 are opened, and when it is detected that the plurality of window covers 30 are sufficiently opened, the motor 110. ) May be stopped to prevent the lifting bar 170 from being raised further.

Therefore, the window cover opening and closing apparatus 100 according to an embodiment of the present invention is configured to semi-automatically open and close the window cover 30 by the controller 180, the opening / closing sensor 181, and the opening angle detecting sensor 182. can do.

Figure 6 shows the main portion of the window cover opening and closing apparatus according to another embodiment of the present invention.

Referring to FIG. 6, the window cover opening and closing device 200 according to another embodiment of the present invention includes a motor 210, a drive shaft 211, a coupling 220, a transmission shaft 230, a worm 231, and a front. Coaxial Support 232, Reel Shaft 240, Worm Wheel 241, Reel Shaft Support 242, Flexible Linear Member 260, Lifting Bar 270, Fastener 271, Spacing Screw 273 and Control Unit 280 may be included.

Here, the motor 210, the drive shaft 211, the coupling 220, the transmission shaft 230, the worm 231, the transmission shaft support 232, the worm wheel 241, the reel shaft support 242, lifting bar ( 270, the fastener 271, the gap adjusting screw 273 and the control unit 280 are the same as described in the window cover opening and closing device (100 of Figs. 3, 4) according to an embodiment of the present invention are overlapping Description is omitted.

As the flexible linear member 260 of the window cover opening and closing apparatus 200 according to another embodiment of the present invention, a belt-shaped strap having a predetermined width made of metal, leather, synthetic resin, or the like may be used. .

Since the rotational force of the motor 210 is transmitted to the reel shaft 240 through the driving shaft 211, the coupling 220, the transmission shaft 230, the worm 231, and the worm wheel 241, the reel shaft 240 is a motor ( It may be rotated in one direction or the other direction by the 210.

The reel shaft 240 may be formed with a winding groove 246 in which the flexible linear member 260 is wound or unwound. The winding groove 246 may be formed to have a width corresponding to the width of the flexible linear member 260. Can be. Accordingly, the flexible linear member 260 may be wound or unwound in the winding groove 246 according to the rotation of the reel shaft 240.

At least one winding groove (not shown) may be further formed in the reel shaft 240 in addition to the winding groove 246 shown. An unshown flexible linear member such as the flexible linear member 260 may be formed in the winding groove which is not shown. Can be combined to be wound or unwound.

One end of the flexible linear member (not shown) is coupled to the lifting bar 270, and when the reel shaft 240 is rotated, the lifting bar 270 may be moved upward or downward while keeping the horizontal.

Thus, although not shown, a plurality of window covers (see 30 in FIG. 3) coupled to the fastener 271 coupled to the lifting bar 270 may be opened or closed at one time.

Therefore, since the window cover opening and closing device 200 according to another embodiment of the present invention has a simpler structure, it is possible to save time and cost required for manufacture and installation.

Although the window cover opening and closing apparatus according to the embodiment of the present invention has been described above, the spirit of the present invention is not limited to the embodiments presented herein, and those skilled in the art to understand the spirit of the present invention are within the scope of the same idea. Other embodiments may be easily proposed by adding, changing, deleting, or adding components, but this will also fall within the spirit of the present invention.

For example, the window cover opening and closing device (100 in FIG. 3, 200 in FIG. 6) according to the embodiments of the present invention as described above, the marina platform (20 in FIG. 2) of the cruise ship (1 in FIG. 1) For example, the present invention is applied to a plurality of window covers (30 of FIG. 3) respectively provided in the plurality of windows (21 of FIG. 2) provided in the example. Both windows or window covers can be applied.

1: cruise ship 10: hull
11: Deck 20: Marina Platform
21: Windows 30: Window Cover
31: hinge 32: rug
100, 200: window cover opening and closing device 110, 210: motor
111, 211: drive shaft 120, 220: coupling
130, 230: Drive shaft 131, 231: Worm
140, 240: Reel shaft 141, 241: Worm wheel
144: spline unit 145: moving winding unit
146, 246: winding groove 147: guide groove
148: guide pin 149: pin support
160: flexible linear member 170, 270: lifting bar
171, 271: Fastener 173, 273: Spacing screw
180, 280: control unit 260: strap
181: opening and closing detection sensor 182: opening angle detection sensor

Claims (7)

A window cover opening and closing device for opening and closing a plurality of window covers, each of which has an upper end rotatably coupled to an upper edge of a plurality of windows arranged in a row,
A plurality of fasteners detachably coupled to the lower sides of the plurality of window covers, respectively;
A lifting bar having the plurality of fasteners coupled in a line along a longitudinal direction;
A plurality of flexible linear members each having one end coupled to the lifting bar;
A reel shaft having the other side of the plurality of flexible linear members respectively coupled to an outer circumferential surface thereof; And
Rotating the reel shaft in one direction or the other direction, comprising a motor for causing the plurality of flexible linear members to be wound or unwind on the outer peripheral surface of the reel shaft,
And the lifting bar is moved upwards or downwards as the plurality of flexible preceding members are wound or unwound on the outer circumferential surface of the reel shaft to open or close the plurality of window covers at a time.
The method of claim 1,
The reel shaft,
A plurality of spline portions formed on at least two portions of an outer circumferential surface of the reel shaft;
A plurality of moving windings respectively coupled to the plurality of spline parts so as to be slidable; And
It includes a plurality of pin support each disposed close to the outer circumferential surface of the plurality of moving windings,
On the outer circumferential surface of the movable winding part, spiral winding grooves having a pitch corresponding to the diameter of the flexible linear member and spiral guide grooves having a pitch corresponding to the winding grooves are formed, respectively.
The pin support is formed to project the guide pin so that the end is inserted into the guide groove,
When the movable winding unit is rotated according to the rotation of the reel shaft and the flexible linear member is wound or unwound on the winding unit, the movable winding unit is moved in one direction or the other direction along the longitudinal direction of the reel shaft. Device.
The method of claim 2,
The flexible linear member is a window cover opening and closing device, characterized in that any one of a chain, wire rope and steel wire.
The method of claim 1,
The flexible linear member is a strap made of any one of metal, leather and synthetic resin,
The reel shaft is formed with a winding groove having a width corresponding to the width of the strap, the window cover opening and closing device, characterized in that the strap is wound or unwinded in the winding groove according to the rotation of the reel shaft.
The method according to claim 2 or 4,
A window cover opening and closing device further comprises a plurality of opening and closing detection sensors which are respectively installed on the edge portions of the plurality of windows or the edge portions of the plurality of window covers, respectively detecting whether the plurality of window covers are opened or closed. .
The method according to claim 2 or 4,
And a plurality of opening angle detecting sensors respectively installed at upper edge portions of the plurality of windows to detect an opening angle of the plurality of window covers.
The method according to claim 2 or 4,
And a plurality of gap adjusting screws interposed between the plurality of fasteners and the lifting bars, respectively, for adjusting a distance between the plurality of fasteners and the lifting bars.

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