JP2009166582A - Openable display device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a safe and space-saving openable display device equipped with a thin monitor for proving passengers with various information, in a transport means such as an air craft. <P>SOLUTION: The openable display device is composed of a driving mechanism 4 arranged on a storing part ceiling surface having a monitor 3 in which a square spindle 8 which is rotatable at both ends of an edge of a square form of the monitor is supported by both sides of a main body frame 2, a link 10 of which the both ends are connected by a driving point 13A interlocking with a ball nut 12 for moving straightly in a direction at right angles to a rotation axial line of the monitor 3 by a ball screw shaft 11 rotated by a motor and an application point 9 apart from an axial line of the spindle 8 of the monitor 3 at a certain distance, an electromagnetic brake 18 for holding the monitor 3 at a fully open position and a torsion spring 22 for energizing the ball screw shaft 11 in a storing direction of the monitor 3. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to an openable display device that is installed on a ceiling portion of a seat of a passenger aircraft or the like, and in which the display portion is rotated and unfolded during use.

  2. Description of the Related Art In recent years, there are an increasing number of transportation means such as airplanes, trains, buses, passenger ships, and the like that are provided with display devices for providing information such as passengers enjoying images.

  Further, there is an increasing demand to enjoy various images individually in the transportation means, and there is a demand for providing a display device having a light and thin monitor that takes up as little space as possible.

  For this reason, in passenger airplanes in particular, an openable display device that pulls out a monitor stored in the lower part of a luggage shelf at the ceiling of the passenger seat and uses it for video distribution services, etc., and stores it again in the ceiling after use is becoming widespread. There are various configurations presented.

  Such an open / close type display device is driven by a motor when the power switch of the device is turned on, and a rectangular flat plate-shaped monitor rotates around its one side and is pulled out from the ceiling storage portion above the seat, After the image is displayed and used at an angle that is easy for the passenger to see, the device is turned and stored again in the original ceiling when the power switch of the device is turned off.

  However, safety is the most important aspect of all aircraft, and display devices are no exception. If the power supply to the cabin is interrupted while using the monitor as described above, Therefore, it is required to immediately retract the monitor into the storage unit.

In order to meet these requirements, storage energy is stored in the spring when the monitor is pulled out to the use position, and the display device is turned off after use or the cabin is energized. An openable display device has been proposed that automatically stores a monitor in a storage section when it is cut off.
Japanese Patent No. 3008437 JP 2000-221901 A

  However, in the above-described conventionally proposed open / close display device, the monitor can be pulled into the storage portion by the energy accumulated in the spring when the monitor is pulled out to the use position. If the spring breaks, the monitor cannot be automatically stored in the storage unit.

  In such a case, a person manually pushes back from behind the monitor to return the monitor. However, the structure of the drive mechanism for rotating the monitor by decelerating the rotation of the output shaft of the motor is disclosed in the open / close display of Patent Document 1. The device uses a multi-stage reduction spur gear, and the device of Patent Document 2 uses a rack, a pinion, and a link. There was a problem that it was heavy and rattled, particularly heavy at the beginning of movement and difficult to push back smoothly with light force.

  In addition, even when the monitor is pulled out, there is a possibility that passengers in the seat below the monitor may be injured by hitting it, or the monitor may be damaged by hitting the luggage to be taken in or out of the luggage rack There was also.

  The present invention has been made to solve such problems, and even when the monitor cannot be automatically stored due to damage to the monitor storage spring, etc., it is pushed by a human hand, It can be rotated and stored smoothly at a stable speed with a relatively light force, and when a predetermined amount of force is applied when the passenger collides with the monitor, the monitor rotates from the stop position and the passenger An object of the present invention is to provide a space-saving open / close display device that can reduce injuries and monitor damage.

  In order to achieve the object as described above, the openable display device of the present invention is a display device disposed in a storage part of a ceiling of a transportation means, and the support shafts at both ends of a rectangular flat plate have a main body. A monitor supported rotatably on bearings on both sides of the frame, a drive point linked to a ball nut that moves linearly in a direction perpendicular to the rotation axis of the monitor by a ball screw shaft rotated by a motor, and a support shaft of the monitor A link having both ends pivotably connected to an operating point that is a certain distance away from the axis, an electromagnetic brake that holds the monitor in the fully open position, and a torsion spring that biases the ball screw shaft in the monitor's storage direction And a driving mechanism disposed on the ceiling surface of the storage unit.

  With such a configuration, when the monitor is pulled out to the use position, the energy for storage is stored in the torsion spring, and the power is turned off after use or the power supply to the guest room is cut off. The monitor can be automatically and smoothly stored in the storage unit, and if the monitor cannot be automatically stored due to a torsion spring breakage, etc., the monitor is pushed by a human hand and the ball nut and ball screw are connected via the link. The ball screw consisting of a shaft has a low coefficient of friction, can be easily converted from linear motion to rotational motion and has few backlashes, and rotates and retracts smoothly with relatively light force while rotating the motor in reverse. Therefore, it is possible to realize an open / close display device with excellent safety.

  Further, in the above configuration, the motor output shaft and the ball screw shaft are arranged in parallel, and the rotation output is transmitted between the motor output shaft and the ball screw shaft by a pair of first spur gear and second spur gear, and a torsion spring. May be arranged on the same axis as the ball screw shaft.

  By adopting such a configuration, the length of the drive mechanism including the ball screw shaft and the ball nut rotated by the motor, the electromagnetic brake and the torsion spring can be shortened. The projected area of the monitor can be made smaller, and the openable display device as a whole can save space and save space, and the urging force of the torsion spring that urges the monitor in the storage direction is a ball screw. Since the monitor is rotated by being increased by the shaft and the ball nut, less force is required for the torsion spring, and the torsion spring can be reduced in size.

  In the above configuration, a universal joint may be mounted between the output shaft of the motor of the drive mechanism and the rotation shaft of the first spur gear.

  With such a configuration, even if there is a slight misalignment between the output shaft of the motor and the rotation shaft of the first spur gear, smooth rotation transmission can be performed without loss. In the process, when the first spur gear, electromagnetic brake, friction clutch or the like is incorporated, it is possible to make it difficult to cause a problem without strictly managing the misalignment with the rotating shaft of the motor.

  In the above configuration, a friction clutch that slips when a predetermined amount of force is applied in the rotation direction of the monitor is disposed between the output shaft of the motor and the ball screw shaft, and a stopper portion at the monitor fully open position. You may make it interpose a rubber sheet in.

  With this configuration, when the passenger collides with the monitor or there is an obstacle in the rotation of the monitor, the friction clutch slips to reduce passenger injury or damage to the monitor. It is possible to prevent an abnormal load from being applied to the motor or the like.

  In the above configuration, the sensor mechanism for detecting the rotation position of the monitor may be composed of a sensor plate fixed to the ball nut and a photo sensor provided on the frame of the drive mechanism along the linear movement direction of the ball nut. Good.

  By adopting such a configuration, the rotation position of the monitor can be detected by detecting the position of the linear movement of the ball nut, so that the portion serving as the management point for the entire openable display device is used as the drive mechanism. It is easy to assemble and adjust the openable display device, and it is a space-saving sensor with a simple configuration, and it is easy to align with the rotational position and has high detection accuracy. Can do.

  In the above configuration, the photo sensor may be provided in the storage position of the monitor, the fully open position, and an intermediate position between them, and the time for reaching the intermediate position and the fully open position from the storage position may be set when the monitor is deployed. .

  With this configuration, when the monitor does not reach the intermediate position or fully open position when deployed from the stowed position, there is an obstacle in the monitor deployment direction, and the friction clutch will slip. Therefore, it is possible to prevent the trouble by stopping the deployment at that position.

  In the above configuration, the motor is a DC motor, and when the electric circuit in which a diode and a resistor are connected in series is connected in parallel with the DC motor, the DC motor is rotated when the monitor is rotated in the storage direction by the biasing force of the torsion spring. The counter electromotive force generated by rotation may be adjusted by changing the resistance value of the electric circuit to control the rotation speed of the monitor.

  By adopting such a configuration, the direct current motor is designed so that the rotational speed in the storing direction is optimal when the monitor is stored by the biasing force of the torsion spring by changing the resistance value in a simple electric circuit. The back electromotive force can be set to an optimum value.

  In the above configuration, the resistor in the electric circuit may be a plurality of resistors connected in parallel.

  With this configuration, even if some of the resistors connected in parallel are damaged and the back electromotive force of the DC motor fluctuates to some extent, the remaining resistance regulates the rotation speed of the monitor. Since it is possible, safety can be increased.

  According to the open / close type display device of the present invention, when the monitor is pulled out to the use position, the storage energy is stored in the torsion spring so that the monitor is automatically turned on after use or when the power to the cabin is cut off. Even if the monitor cannot be stored automatically due to a torsion spring breakage, etc., the friction coefficient of the ball screw consisting of a ball nut and a ball screw shaft can be reduced by pushing the monitor with a human hand. It is very safe because it can be rotated and stored smoothly with a relatively light force while rotating the motor in reverse by taking advantage of the features of easy conversion from linear motion to rotational motion and less backlash. The present invention has a great effect that an excellent open / close display device can be realized.

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

  Here, the case of a passenger aircraft will be described here as an example, but the present invention is not limited to an aircraft, and can be applied to various transportation means such as trains, buses, passenger ships and the like.

  A schematic configuration of an openable display device according to an embodiment of the present invention stored in a ceiling portion of a passenger aircraft, particularly in a storage portion provided at a lower portion of a luggage shelf, is shown in a perspective view of FIG.

  FIG. 4A shows the storage state of the monitor, and FIG. 4B shows the use state of the monitor.

  As shown in the figure, a monitor 3 as a display unit is arranged at the lower part of the main body frame 2 of the openable display device 1 and a drive mechanism 4 as an opening / closing means is arranged at the upper part. Part, in particular, a storage part 6 provided in the lower part of the luggage shelf 5.

  The monitor 3 as a whole is a rectangular flat plate and has a panel-like display portion 7 such as an LCD. The support shafts 8 on the same axis provided at both ends in the vicinity of one side of the square rotate to bearings on both sides of the body frame 2. It is supported so that it can be rotated and deployed at a screen angle that is easy to see for passengers by a drive mechanism 4 disposed above, and is stored in the lower part of the main body frame 2 again after use.

  Next, a specific configuration of the present embodiment will be described.

  2 is a plan view of the openable display device 1 according to the embodiment of the present invention as viewed from above the storage portion 6 in the storage position of the monitor 3, and FIG. 3 is a cross-sectional view taken along line AA in FIG. The monitor 3 is fitted and housed in the lower surface of the inner bottom plate of the main body frame 2 that is slightly larger than the outer shape of the monitor 3, and the drive mechanism 4 is mounted in the frame on the upper surface.

  In the monitor 3, support shafts 8 provided at both ends near one side are rotatably supported by bearings on both sides of the body frame 2, and a link 10 is provided at an action point 9 that is separated from the axis of the support shaft 8 by a certain dimension. One end portion 10A is connected to be rotatable.

  Further, the other end portion 10B of the link 10 is rotatably connected to a link driving point 13A of a connecting block 13 coupled to the ball nut 12 of the driving mechanism 4, and the link 10 is connected to the monitor 3 and the connecting block 13. That is, it is a member for connecting the ball nut 12 and rotating the monitor 3.

  The ball nut 12 moves linearly by the rotation of the ball screw shaft 11. The ball screw shaft 11 is arranged so that the axis of the ball screw shaft 11 is orthogonal to the axis of the support shaft 8 of the monitor 3. By moving linearly in a direction perpendicular to the support shaft 8 of the monitor 3, the monitor 3 is rotated and deployed and stored.

  Next, in addition to FIGS. 2 and 3, the detailed configuration of the drive mechanism 4 of the open / close display device 1 according to the embodiment of the present invention is shown in an external perspective view of the drive mechanism of FIG. 4 and the drive mechanism of FIG. 5. It demonstrates using an exploded perspective view.

  In FIG. 5, since some of the mounting screws are not shown, the illustration is omitted.

  As described above, the monitor 3 is rotated via the link 10 by the ball nut 12 engaged with the ball screw shaft 11 of the drive mechanism 4, that is, the connecting block 13, being linearly moved. As shown in FIG. 4, these members and a power source for rotating the ball screw shaft 11 are collectively mounted on the frame 14.

  As shown in FIGS. 2, 4, and 5, the members are linearly arranged on the frame 14 around two parallel axes.

  That is, the universal joint 17, the electromagnetic brake 18, the first spur gear 19 and the friction clutch 20 are arranged on the first axis centered on the output shaft 16 of the motor 15 located on the near side in the figure, and the back A second spur gear 21 and a torsion spring 22 are disposed on a second axis centered on the ball screw shaft 11 located on the side, and a pair between the first axis and the second axis is a pair. The first spur gear 19 and the second spur gear 21 transmit rotation.

  The first axis is fitted and supported in the first bearing hole 23 on the frame wall surface between the electromagnetic brake 18 and the first spur gear 19 while the motor 15 accommodated in the motor case 15A is fixed to the frame 14 with screws. In the second axis, one end portion of the ball screw shaft 11 is fitted and supported by the bearing 25 at the corner portion of the frame 14, and the other end portion connected to the second spur gear 21 is the second wall surface. The bearing hole 24 is fitted and supported for positioning.

  In this way, the drive mechanism including the ball screw shaft 11 and the ball nut 12 driven by the motor 15, the electromagnetic brake 18 and the torsion spring 22 by dividing each member into the first axis and the second axis and arranging them in parallel. Since the length of the drive mechanism 4 can be shortened, the overall size of the drive mechanism 4 can be made smaller than the projected area of the monitor 3 during storage, and the entire openable display device 1 can be saved in a small space. It can be what is not.

  Next, the content of each member arranged on the first axis and the second axis will be described.

  First, the motor 15 on the first axis needs to have a small but high output as a power source for rotating the monitor 3 from the storage position to the use position and for winding a torsion spring 22 described later. A direct current motor with a geared block is used, and is housed in the motor case 15A and fixed to the frame 14 as described above in order to reduce the rotational noise.

  As will be described later, when the monitor 3 is housed from the use position using the torsion spring 22 as a power source, the motor 15 is generated by being reversely rotated via the second spur gear 21 and the first spur gear 19. The counter electromotive force is controlled to brake the speed at the time when the monitor 3 is rotated and stored.

  The output shaft 16 of the motor 15 is connected to the first rotating shaft 26 (see FIG. 5) via the universal joint 17.

  The first rotating shaft 26 is coupled to the rotor in the electromagnetic brake 18 and one friction plate of the friction clutch 20, and the first spur gear 19 is connected to the friction clutch at the outer peripheral portion of the first rotating shaft 26. 20 is connected to the other friction plate (not shown).

  Since the universal joint 17 is mounted between the output shaft 16 of the motor 15 and the first rotating shaft 26, even if there is a slight misalignment between these two shafts, smooth rotation is possible with almost no problem. You can communicate.

  The electromagnetic brake 18 fixed to the frame 14 by the mounting bracket 18A between the universal joint 17 and the first bearing hole 23 of the frame wall surface has the rotor coupled to the first rotating shaft 26 as described above. The rotor is electromagnetically coupled to an armature portion as a fixed portion fixed to the frame 14 by a signal from the sensor mechanism 32 described later, thereby stopping the rotation of the first rotating shaft 26.

  The friction clutch 20 has a surface at a constant pressure, with one friction plate coupled to the first rotating shaft 26 and the other friction plate coupled to the first spur gear 19 sandwiching the friction surface. Although they are in contact and usually rotate together, if a rotational force exceeding a predetermined value is applied between the two friction plates, that is, between the first rotating shaft 26 and the first spur gear 19, the friction surface slips. It has become.

  Next, the ball screw shaft 11 on the second axis has one end fitted into the bearing 25 at the corner of the frame 14 and the other end fitted into the second bearing hole 24 in the frame wall as described above. The second spur gear 21 is coupled to the second rotation shaft 27 (see FIG. 5) protruding from the second spur gear 21, and the central portion of the torsion spring 22 accommodated in the spring case 22 </ b> A is coupled to the second spur gear 21. .

  The torsion spring 22 is formed by winding a strip-shaped spring steel plate into a spring shape, and serves as a power source when the monitor 3 is housed from the use position.

  On the other hand, the ball screw shaft 11 is engaged with a ball nut 12 having a ball circulation tube or the like for inserting and rotating a small ball (steel ball) between a screw thread of a nut attached to the outer periphery of the ball screw shaft 11. Thus, the ball screw shaft 11 moves linearly.

  Then, as shown in FIG. 6 which is a cross-sectional view taken along the line BB in FIG. 4 (the motor case portion is not cross-sectioned), the movement of the ball nut 12 is transmitted to related members. A connecting block 13 is fixed.

  That is, the tip 13B of the connecting block 13 extending below the motor 15 is a slider of the linear rail 28 fixed to the bottom surface of the frame 14, as shown in FIG. 5 and FIG. 6 which is a sectional view of the drive mechanism. The ball nut 12 is coupled to 28A so as to be accurately moved linearly.

  In addition, as described above, the other end portion 10B of the link 10 can be rotated at the drive point 13A of the link mounting portion 13C provided so as to protrude from the connecting block 13 at an intermediate position between the first axis and the second axis. Although linked, as described above, the link 10 rotates the monitor 3 via the one end 10A.

  An elongated wiring board disposed outside the ball screw shaft 11 on the end surface of the frame 14 is a sensor substrate 29, and three photosensors 30 are provided on the upper surface thereof in parallel with the axis of the ball screw shaft 11. Yes.

  The three photosensors 30 are provided corresponding to the storage position of the monitor 3, the fully open position, and the intermediate position between them, and the tip of the sensor plate 31 attached to the upper surface of the end of the ball nut 12 is A sensor mechanism 32 is configured to detect the rotational position of the monitor 3 based on the position where the three photosensors 30 are blocked as the ball nut 12 moves linearly.

  That is, the leftmost photosensor 30A detects the storage position of the monitor 3, the rightmost photosensor 30B detects the fully open position of the monitor 3, and generates a signal. The intermediate photosensor 30C releases the monitor 3 from the storage position. If the photo sensor 30C does not reach the position where the photosensor 30C is provided within a predetermined time during deployment, it is determined that there is an obstacle in the deployment direction of the monitor 3 and the friction clutch 20 is slipping, and deployment is performed at that position. Is to be canceled.

  The open / close display device 1 of the present embodiment has the above-described configuration, and the operation thereof will be described with reference to the drawings.

  FIG. 7 is a cross-sectional view of the state in which the monitor 3 is turned to the fully open position from the state of FIG. 3, which is a cross-sectional view of the openable display device 1 in the storage position of the monitor 3.

  First, the operation during monitor development will be described.

  2 and 3, when the power switch of the open / close display device 1 is turned on, the lock (not shown) of the monitor 3 is released, and the motor 15 of the drive mechanism 4 is supplied with power. The output shaft 16 rotates in the direction (counterclockwise), and the rotation is smoothly transmitted via the universal joint 17 so that the first rotation shaft 26 rotates.

  At this time, the electromagnetic brake 18 does not act as a brake because the rotor idles.

  When the rotation is transmitted to the first spur gear 19 via the friction clutch 20, the second spur gear 21 is next to the right direction (as viewed from the right side of the drawing), which is the opposite direction to the output shaft 16 of the monitor 3. Rotate clockwise).

  As a result, the second rotating shaft 27 (see FIG. 5) rotates and winds the torsion spring 22 to store energy, and the ball screw shaft 11 connected to the second spur gear 21 rotates in the same direction. The ball nut 12 meshed with each other moves linearly in the right direction of the drawing.

  The linear movement is guided by the slider 28A and the linear rail 28 fixed to the connecting block 13 coupled to the ball nut 12, and moves linearly accurately.

  Then, the link 10 rotatably connected to the drive point 13A of the connection block 13 also moves rightward, and pulls the action point 9 of the monitor 3 rotatably connected to the one end 10A to the right. The monitor 3 starts rotating around the support shafts 8 at both ends, and expands from the storage position of FIG. 3 toward the fully open position of FIG.

  At the same time, the sensor plate 31 of the sensor mechanism 32 attached to the ball nut 12 also moves, from the position of the left end photo sensor 30A to the right end photo sensor 30B via the intermediate position photo sensor 30C, that is, The monitor 3 moves to a position where it is fully open.

  At this time, if the sensor plate 31 does not reach the time set in the intermediate position photosensor 30C or the rightmost photosensor 30B, there is an obstacle in the developing direction of the monitor 3, and the friction clutch 20 slips. At this position, the deployment is stopped and trouble is prevented.

  At the fully open position of the monitor 3 shown in FIG. 7, the rubber sheet 33 attached to the protruding portion 3A provided at the flange end of the monitor 3 hits the stopper 34 provided on the main body frame 2 and at the same time, the sensor plate 31 The rotor of the electromagnetic brake 18 is electromagnetically coupled to the armature portion of the fixed portion by the electric signal generated when the position reaches the position of the rightmost photo sensor 30B, and the rotation portion of the drive mechanism 4 and the monitor 3 are stopped from rotating. The power supply to is stopped.

  In this way, the open / close display device 1 in which the monitor 3 is in the fully open position, that is, the use position, is supplied with power only when the electromagnetic brake 18 is ON, and is used with other members such as the motor 15 being OFF.

  Although the torsion spring 22 in the wound state tries to rotate the second rotating shaft 27, the monitor 3 can maintain the fully open position by the action of the electromagnetic brake 18.

  Next, the operation when the monitor is stored will be described.

  When the power supply to the open / close display device 1, that is, the power supply to the electromagnetic brake 18 is stopped in the fully opened state of the monitor 3, the rotor and the armature portion of the electromagnetic brake 18 that are electromagnetically coupled are separated and the brake is released. .

  Then, the second rotating shaft 27 is rotated in the left direction (counterclockwise) as viewed from the right side of FIG. 7 by the urging force of the torsion spring 22 wound when the monitor 3 is unfolded and stored energy. The ball screw shaft 11 rotates to the left, and the ball nut 12 and the connecting block 13 coupled thereto move linearly to the left in the drawing.

  Then, the link 10 connected to the drive point 13A of the connection block 13 also moves to the left and pushes the action point 9 of the monitor 3 connected to the one end 10A to the left, so that the monitor 3 is supported at both ends. It starts to rotate around the shaft 8 and automatically rotates from the fully open position in FIG. 7 to the storage position in FIG.

  At the same time, when the second spur gear 21 rotates in the left direction, the first spur gear 19 rotates in the opposite right direction, and the motor 15 is rotated in the right direction via the first rotation shaft 26. A counter electromotive force is generated (see FIG. 2).

  When the sensor plate 31 attached to the ball nut 12 reaches the position of the leftmost photosensor 30A, the storage of the monitor 3 in the lower part of the main body frame 2 is completed, and the state shown in FIG. )

  FIG. 8 shows an example of an electric circuit for driving the motor 15 of the open / close display device 1 according to the embodiment of the present invention. In FIG. 8, the electric circuit includes a DC power supply 35, a diode 36, a resistor array 37, and a switch 38. When the monitor 3 is opened, the switch 38 is closed and power is supplied to the motor 15 so that the motor 15 rotates in the forward direction. On the other hand, when the monitor 3 is housed, the switch 38 is opened to stop the power supply to the motor 15 and the back electromotive force generated when the motor 15 rotates in reverse by the urging force of the torsion spring 22 is applied to the diode 36. The resistance value of the electric circuit including the resistor array 37 can be changed and adjusted so that the rotation speed of the monitor 3 becomes the best.

  Further, as shown in FIG. 8, since the resistor array 37 is configured by connecting a plurality of resistors in parallel, a part of the plurality of resistors connected in parallel is damaged and the back electromotive force of the motor 15 varies to some extent. However, since the rotation speed of the monitor 3 can be regulated by the remaining resistance, safety can be improved. Although FIG. 8 shows an example in which four resistors are connected in parallel, the number of resistors is not limited to this.

  As described above, the openable display device 1 according to the present embodiment automatically returns the monitor 3 to the storage position when the power supply is stopped when the monitor 3 is in the fully open position. Even when the power supply to the guest room is cut off during use, the monitor 3 immediately returns to the storage position.

  Next, in addition to the above storage function in the openable display device 1 according to the present embodiment, the content that further considers safety will be described.

  As a first safety countermeasure, an operation when the monitor 3 is pushed with a large force in the rotation direction at the fully open position of the monitor 3 of the openable display device 1 of the present embodiment will be described.

  First, in the fully open position of the monitor 3 shown in FIG. 7, when a passenger below the monitor 3 or a luggage to be taken in and out of the luggage rack hits the monitor 3 from behind and is pushed in the storing direction with a force greater than a predetermined size, The force pulls the link 10 leftward and is transmitted to the connecting block 13, that is, the ball nut 12.

  Then, when the ball nut 12 moves linearly in the left direction in the drawing, the ball screw shaft 11 and the second spur gear 21 are rotated in the left direction as viewed from the right side in the drawing, so the first spur gear 19 and the friction clutch 20 are rotated. Tries to rotate to the right (see FIG. 2).

  However, as described above, the friction clutch 20 has a constant pressure with one friction plate coupled to the first rotating shaft 26 and the other friction plate coupled to the first spur gear 19 sandwiching the friction surface. The first rotary shaft 26 is in contact with the rotor of the electromagnetic brake 18.

  Since the rotor of the electromagnetic brake 18 is electromagnetically coupled to the armature of the fixed portion and does not rotate, the rotor slips on the friction surface between the two friction plates of the friction clutch 20, and the monitor 3 causes the slip of the friction surface to cause the monitor 3 to move in the storing direction. Rotate to some extent.

  Then, the electromagnetic signal of the rotor and the armature of the electromagnetic brake 18 is generated by an electrical signal that informs that the sensor plate 31 of the sensor mechanism 32 attached to the ball nut 12 has moved from the right end photosensor 30B to the left by the above movement. The coupling is released and the brake is released, and the monitor 3 returns to the storage position.

  If the power switch is turned off, the monitor 3 stays in the storage position, and if the power switch is not turned off, the monitor 3 rotates again to the normal fully opened position and stops.

  In order to perform such an operation, the frictional force of the frictional surface of the friction clutch 20 is set to a constant value that is larger than the rotational force required when the monitor 3 is normally deployed and stored.

  Next, the operation when the monitor 3 is pushed with a large force in the opening direction opposite to the rotation direction at the fully open position of the monitor 3 of the openable display device 1 will be described.

  In the fully open position of the monitor 3 shown in FIG. 7, the monitor 3 stops when the rubber sheet 33 attached to the protruding portion 3 </ b> A provided at the flange end portion hits a stopper 34 provided on the main body frame 2.

  When a passenger under the monitor 3 or a luggage to be taken in and out of the luggage rack hits the monitor 3 from the front and is pushed further in the direction in which the monitor 3 is further opened with a force larger than a predetermined size, the force is determined. The rubber sheet 33 attached to the protrusion 3A at the flange end of the monitor 3 is elastically bent so that the sensor plate 31 of the sensor mechanism 32 is not so far from the right photosensor 30B. Absorbs the pushing force.

  However, the force by which the monitor 3 is pushed further in the opening direction is considerably large with respect to the determined size, and the rubber sheet 33 attached to the protrusion 3A at the flange end of the monitor 3 is greatly bent, and the sensor mechanism 32 When the sensor plate 31 is disengaged from the photosensor 30B at the right end, power supply to the electromagnetic brake 18 that has stopped the monitor 3 in the fully open position is stopped by the electrical signal from the sensor mechanism, the brake is released, and the monitor 3 is stored. Return to position.

  If the power switch is turned off, the monitor 3 stays in the storage position, and if the power switch is not turned off, the monitor 3 rotates again to the normal fully opened position and stops.

  Next, as a second safety countermeasure, an operation when the torsion spring 22 that returns the monitor 3 of the open / close display device 1 of the present embodiment to the storage position from the deployed position is damaged will be described.

  Even if the torsion spring 22 is damaged and does not act, there is no hindrance to the rotation of the monitor 3, but when the monitor 3 is stored, the monitor 3 is in the storage position unless the urging force of the torsion spring 22 is applied. Does not automatically rotate toward

  In this case, since the deployment angle at the fully opened position of the monitor 3 is about 110 °, it returns to the position at the deployment angle of 90 ° by its own weight (see FIG. 7).

  When the monitor 3 is pushed by hand from behind in this state, the link 10 is pulled leftward, and the force is transmitted to the connecting block 13, that is, the ball nut 12.

  Then, when the ball nut 12 moves linearly in the left direction in the drawing, the ball screw shaft 11 and the second spur gear 21 are rotated in the left direction as viewed from the right side of the drawing, so that the first spur gear 19 is moved in the right direction. The motor 15 rotates to the right via the first rotation shaft 26 (see FIG. 2).

  Thus, when the sensor plate 31 attached to the ball nut 12 reaches the position of the leftmost photo sensor 30A, the storage of the monitor 3 in the lower part of the main body frame 2 is completed, and the state shown in FIG. Not shown).

  During this operation, the ball screw shaft 11 can be easily rotated counterclockwise by the linear movement of the ball nut 12 because of the low friction coefficient of the ball screw comprising the ball nut 12 and the ball screw shaft 11 and rotating from the linear motion. It takes advantage of the features of easy conversion to motion and less backlash, and allows the monitor 3 to be rotated and stored smoothly with relatively light force.

  As described above, the openable display device 1 according to the present embodiment accumulates energy for storage in the torsion spring 22 when the monitor 3 is deployed and rotated to the use position, and can be used after use or in the cabin. When the power is cut off, the monitor 3 can be automatically stored in the storage part. When the monitor 3 cannot be automatically stored due to damage of the torsion spring 22 or the like, Since the motor 15 can be rotated in the reverse direction by rotating the motor 15 by utilizing the characteristics of the ball screw consisting of the ball nut 12 and the ball screw shaft 11, it can be opened and closed with extremely high safety. Display device.

  In the above description, the constituent members of the drive mechanism 4 of the openable display device 1 are divided into the first axis centered on the output shaft 16 of the motor 15 and the second axis centered on the ball screw shaft 11 in parallel. Although they are arranged, it is not always necessary to divide them into two axes.

  That is, the ball screw shaft 11 and the torsion spring 22 may be arranged in series on the same axis line in which the output shaft 16 of the motor 15 and the universal joint 17, the electromagnetic brake 18, and the friction clutch 20 are arranged.

  In the case of this series arrangement, two spur gears that transmit rotation between the two axes are not required, and the screw thread of the ball screw shaft 11 and the winding direction of the torsion spring 22 are the same as those of the ball screw shaft 11 and the torsion spring 22 arranged in parallel. Is reversed and slightly longer as a whole drive mechanism.

  INDUSTRIAL APPLICABILITY The present invention is very useful as a display device including a thin monitor for providing various information to passengers in transportation means such as airplanes, trains, buses and passenger ships.

BRIEF DESCRIPTION OF THE DRAWINGS It is a perspective view which shows schematic structure of the open / close-type display apparatus in embodiment of this invention, (a) is a figure which shows the accommodation state of a monitor, (b) is a figure which shows the use condition of a monitor. The top view seen from the upper part of a storage part in the storage position of the monitor of the opening-and-closing type display device Sectional drawing in the AA line of FIG. External perspective view of the drive mechanism of the open / close display device Exploded perspective view of drive mechanism of the openable display device Sectional drawing in the BB line of FIG. Sectional view with the monitor in the fully open position from the state of FIG. The figure which shows the electric circuit which drives the motor of the opening-and-closing type display device

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Opening-closing type display apparatus 2 Main body frame 3 Monitor 3A Protrusion part 4 Drive mechanism 5 Luggage shelf 6 Storage part 7 Display part 8 Support axis 9 Action point 10 Link 10A One end part 10B Other end part 11 Ball screw shaft 12 Ball nut 13 Connection block 13A Driving point 13B End portion 13C Link mounting portion 14 Frame 15 Motor 15A Motor case 16 Output shaft 17 Universal joint 18 Electromagnetic brake 18A Mounting bracket 19 First spur gear 20 Friction clutch 21 Second spur gear 22 Torsion spring 22A Spring case 23 First 1 bearing hole 24 second bearing hole 25 bearing 26 first rotating shaft 27 second rotating shaft 28 linear rail 28A slider 29 sensor board 30, 30A, 30B, 30C photosensor 31 sensor plate 32 sensor mechanism 33 rubber Sheet 34 Stopper 35 DC power supply 36 Diode 37 Resistance array 38 Switch

Claims (8)

An openable display device disposed in a ceiling storage part of a transportation means,
A monitor in which support shafts on both sides of a rectangular flat plate are supported by bearings on both sides of the main body frame so as to be able to rotate and deploy,
Both ends pivot to a drive point linked to a ball nut that moves linearly in a direction orthogonal to the rotation axis of the monitor by a ball screw shaft that is rotated by a motor, and to an action point that is a certain distance away from the axis of the support shaft of the monitor. A link that can be connected, an electromagnetic brake that holds the monitor in a fully open position, and a torsion spring that biases the ball screw shaft in the storage direction of the monitor, and is disposed on the ceiling surface side of the storage unit Drive mechanism,
While rotating the monitor in the fully open direction through the ball screw shaft, the ball nut and the link by the rotation of the motor,
When the electromagnetic brake is in a non-energized state, the monitor is rotated through the ball screw shaft, the ball nut, and the link by the biasing force of the torsion spring, and is stored in the storage portion. Openable display device. An output shaft of the motor and the ball screw shaft are arranged in parallel, and rotation is transmitted between the output shaft of the motor and the ball screw shaft via a pair of first spur gear and second spur gear, and the twist 2. The openable display device according to claim 1, wherein a spring is disposed on the same axis as the ball screw shaft. 2. The openable display device according to claim 1, wherein a universal joint is mounted between an output shaft of the motor of the drive mechanism and a rotary shaft that rotates the first spur gear. A friction clutch that slips when a force of a predetermined amount or more is applied in the rotation direction of the monitor is disposed between the output shaft of the motor and the ball screw shaft, and a rubber sheet is provided at a stopper portion at the monitor fully open position. The openable display device according to claim 1, further comprising: The sensor mechanism for detecting the rotation position of the monitor includes a sensor plate fixed to the ball nut and a photo sensor provided on a frame of the drive mechanism along a linear movement direction of the ball nut. The openable display device according to Item 1. 6. The photo sensor is provided at a storage position, a fully open position of the monitor, and an intermediate position between the two, and a time for reaching the intermediate position and the fully open position from the storage position when the monitor is deployed is set. The openable display device described in 1. The motor is a DC motor, and an electric circuit in which a diode and a resistor are connected in series is connected in parallel with the DC motor, and the DC motor rotates when the monitor is rotated in the storage direction by the biasing force of the torsion spring. The open / close display device according to claim 1, wherein the counter electromotive force generated in this manner is adjusted by changing a resistance value of the electric circuit to control a rotation speed of the monitor. 8. The openable display device according to claim 7, wherein the resistor in the electric circuit is a plurality of resistors connected in parallel.

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