JP5344977B2 - Flap table - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To enable the flap table to require less power for rotating the top board and to avoid shock when the top board is rotated by minimizing its size and simplifying its structure. <P>SOLUTION: Torsion bar 51 provided along the center line P1 of the rotation of the top board 20 and a first supported member of the two supported members on the torsion bar 51 are supported by a first bar holding metal 52 to support it by restricting the rotation and a second bar holding metal 53 so that the second supported member may rotate with the rotation of the top board 20. The torsion bar 51 is distorted wherein torques N1 and N2 act, which elastically energize the top board 20 in the opposite direction of the torque generated by the gravity of the top board 20 in the top board rotation mechanism, when the top board 20 is in a horizontal position or in a standing position. It is also possible to employ a spring mechanism instead of the torsion bar 51. <P>COPYRIGHT: (C)2011,JPO&amp;INPIT

Description

  The present invention relates to a flap table provided with a mechanism for pivotally supporting a top plate in a laid-down posture when in use and a standing posture in a non-use state, and in particular, a flap capable of smoothly rotating the top plate. It is about the table.

2. Description of the Related Art Conventionally, a flap table is known in which a top plate is pivotally supported by a rotation support mechanism provided on a support leg. The flap table can turn the top plate into a substantially horizontal sideways posture when in use, and can stand in a standing posture when not in use. The flap table is highly convenient in that it occupies less space when not in use.
By the way, in the flap table, when the torque of the top plate rotated by the user cannot be sufficiently supported, a strong impact is generated at the rotation end of the top plate in the sideways posture and the standing posture. The impact becomes more prominent as the top plate is larger and heavier.
In Patent Document 1 and Patent Document 2, in order to mitigate the impact, the top plate rotation support mechanism is provided with a rotary damper or a piston cylinder type damper that suppresses the rotation speed of the top plate. Is shown for a given flap table.

JP-A-11-211025 JP 2004-135725 A

However, the conventional flap table has the following second problem in addition to the first problem related to the impact. That is, the conventional flap table has a problem that when a heavy top plate is employed, a very large force is required to rotate the top plate between the sideways posture and the standing posture. In a general flap table, a particularly large force is required to lift the top plate from the lateral position to the standing position.
Further, when the damper shown in Patent Document 1 or Patent Document 2 is adopted in the flap table, the resistance to the rotation of the top plate is increased, and the second problem can be more prominent.
Furthermore, in the flap table shown in Patent Document 1 or Patent Document 2, if a heavy top plate is adopted, a large damper corresponding to the large moment of inertia of the top plate is required. In this case, the increase in the occupied space, weight and cost of the flap table becomes a new problem.
On the other hand, in the flap table, it is desirable that the measures for solving the first problem and the second problem can be realized with a small and simple configuration.
Accordingly, the present invention has been made in view of the above circumstances, and the object of the present invention is to reduce the force required for the pivoting operation of the top plate, and to reduce the force required to rotate the top plate in the flap table. An object of the present invention is to provide a flap table capable of avoiding an impact during a rotation operation.

In order to achieve the above object, a flap table according to the present invention includes the components shown in the following (1) and (2).
(1) A top plate rotation support mechanism that pivots on the top plate so as to be pivotable between a posture and a standing posture.
(2) The top plate rotation support mechanism when the top plate is in at least one of the sideways posture and the standing posture by elastically urging the top plate or a portion interlocking with the rotation of the top plate. A top plate elastic urging means for generating a torque in a direction opposite to the torque generated by the gravity of the rotating part including the top plate.
The state in which the top plate is in the sideways posture is a use state of the flap table in which the top plate is held horizontally or substantially horizontally. Further, the state in which the top plate is in the standing posture is an unused state of the flap table that is held so that the top plate stands in the vertical direction or an oblique direction close thereto.
In the flap table according to the present invention, the torque generated by the top plate elastic biasing means assists the force required to start rotation of the top plate in the sideways posture or the standing posture. In addition, the torque generated by the top plate elastic urging means is such that when the rotated top plate reaches the sideways posture or the standing posture, the rotational force due to gravity of the rotating portion including the top plate is obtained. Suppress the generation of strong impact.

Further, in the flap table according to the present invention, it is conceivable that the top plate elastic urging means includes the components shown in the following (2-1) and (2-2).
(2-1) A torsion bar supported by two supported parts along the center line of rotation of the top plate.
(2-2) One of the two supported parts of the torsion bar is supported by the first support part while restricting its rotation, and the other is rotated in conjunction with the rotation of the top plate. The rotating portion including the top plate in the top plate rotation support mechanism is supported on the torsion bar when the top plate is in at least one of the sideways posture and the standing posture. Torsion bar support means for generating a twist in which a torque in a direction opposite to that generated by gravity is generated.
Hereinafter, the case where the flap table according to the present invention includes the torsion bar will be described.
The torsion bar is twisted according to the rotation of the top plate.
For example, when the top plate is in the horizontal position, the flap table causes the top plate to rotate to the standing posture side by the gravity of the rotating portion including the top plate in the top plate rotation support mechanism. Some produce torque in the opposite direction. In this case, for example, the top plate elastic urging means may be configured such that when the top plate is in the sideways posture or a posture close thereto, the top plate is subjected to elastic urging force due to twisting of the torsion bar in the first direction. On the other hand, it is possible to generate the first torque in the rotation direction toward the standing posture side.
Here, a case is considered in which the user performs an operation of rotating the top plate from the standing posture to the lateral posture in order to use the flap table, that is, an operation before use. In this case, when the top plate rotated by the user approaches the sideways posture that is the first rotation end, the first torque suppresses the momentum due to the weight of the top plate and the operation force of the user. The rotational speed of the top plate is reduced. As a result, it is possible to avoid or reduce the occurrence of a strong impact on the flap table due to excessive momentum of the top plate when the top plate reaches the sideways posture.

Next, consider a case where the user performs an operation of turning the top plate from the lateral position to the standing position, that is, an operation after use, in order to clear the flap table. In this case, when the user starts to rotate the top plate against the frictional resistance of the support shaft of the top plate or the weight of the top plate in the lying position, the first torque is , It acts in a direction to assist the user's rotation operation (operation to lift the top plate). As a result, even when the top plate is large and heavy, or when the user is powerless, the top plate in the lying position can be easily rotated.
As described above, in the flap table according to the present invention, when the first torque by the torsion bar rotates the top plate from the standing posture to the sideways posture, the top plate is rotated. Suppress the momentum of movement and suppress the occurrence of strong impact. Further, the first torque by the torsion bar assists the force required to start the top plate when the top plate is rotated from the sideways posture to the standing posture.
In addition, the torsion bar can generate a strong torque by adopting a relatively thin rod-like member, and the structure for supporting it is simple. Therefore, the flap table according to the present invention can realize a reduction in force required for the rotation operation of the top plate and avoidance of an impact during the rotation operation of the top plate with a very small and simple configuration.

In addition, the flap table, for example, in the top plate rotation support mechanism, when the top plate is in the sideways posture, the top plate is rotated to the standing posture side by the gravity of the rotating portion including the top plate. Torque in a direction opposite to the direction in which the top plate is placed, and when the top plate is in the standing posture, the torque in the direction opposite to the direction in which the top plate is turned sideways and turned to the posture side by the gravity of the rotating portion including the top plate. There is something that occurs.
In such a case, the torsion bar support means supports the torsion bar so that the torsion bar is twisted in the opposite direction depending on whether the top plate is in the horizontal position or the standing position. It is possible.
In this case, when the top plate is in the standing posture or a posture close thereto, the rotation direction toward the sideward posture side with respect to the top plate by the elastic biasing force due to the twist of the torsion bar in the second direction. A second torque is generated. When the top plate is in a predetermined intermediate position between the sideways posture and the standing posture, the torsion bar is not twisted, that is, the first supported by the torsion bar The support angle of the part and the second supported part is the same angle. This state is a state where torque from the torsion bar is not generated with respect to the top plate.
As a result, when the user starts to rotate the top plate against the frictional resistance of the support shaft of the top plate or the weight of the top plate in the standing posture standing upright. The torque of 2 acts in a direction that assists the user's turning operation. As a result, even when the top plate is large and heavy, or when the user is powerless, the top plate in the standing posture can be easily rotated.
In addition, when the top plate rotated by the user approaches the standing posture that is the second rotation end, the second torque suppresses the momentum due to the weight of the top plate and the user's operation force. Thus, the rotational speed of the top plate is reduced. As a result, it is possible to avoid or reduce the occurrence of a strong impact on the flap table due to excessive momentum of rotation of the top plate when the top plate reaches the standing posture.
As described above, in the flap table according to the present invention, the top plate can be rotated by the torsion bar when the top plate is rotated in either the standing posture or the sideways posture. Torque that assists the force required for starting and torque that suppresses the momentum of rotation of the top plate and suppresses the generation of a strong impact are generated.

Further, it is further preferable that the flap table according to the present invention further includes a component shown in the following (3).
(3) A support position variable mechanism that variably supports the position of the second support part of the torsion bar support means in a direction along the rotation center line of the top plate.
The support position varying mechanism is a mechanism that varies the distance between the first support portion and the second support portion. Thereby, in a plurality of types of flap tables in which the moment of inertia of the top plate differs depending on the weight of the top plate and the position where the top plate is supported, the type of the flap table can be used while sharing parts such as the torsion bar. The appropriate first torque and second torque can be set accordingly.
Similarly, it is further preferable that the flap table according to the present invention further includes a component shown in the following (4).
(4) A support angle variable mechanism that variably supports the first support portion of the torsion bar support means in the circumferential direction around the rotation center line of the top plate.
The support angle varying mechanism is a mechanism that varies the balance between the first torque and the second torque by varying the support angle of the top plate when the torsion bar is not twisted. It is. Thereby, in a plurality of types of flap tables in which the balance between the moment of inertia of the top plate in the sideways posture and the moment of inertia of the top plate in the standing posture is different, the parts such as the torsion bar are shared, An appropriate balance between the first torque and the second torque according to the type of the flap table can be set.

Further, it is conceivable that the torsion bar support means has the structure shown in either of the following (5) or (6).
(5) The first support portion of the torsion bar support means is configured so that one of the two supported portions of the torsion bar is in a circumferential direction centered on a rotation center line of the top plate. The angle at is fixed and supported.
In this case, the support angle of the top plate in a state where the top plate is not twisted is a certain angle.
(6) The first support part of the torsion bar support means is configured so that one of the two supported parts of the torsion bar is in a circumferential direction about the rotation center line of the top plate. Is supported within a predetermined range smaller than the angular range of rotation of the top plate.
In this case, the support angle of the top plate when the top plate is not twisted becomes the predetermined range smaller than the rotation angle range of the top plate.

In general, the torsion bar generates a larger torque as the twist angle is larger, but the durability tends to decrease. If the torsion bar has a low spring constant (high flexibility) depending on its material and thickness, durability can be secured even if the twist angle is increased to some extent, but the torque due to twist decreases. To do.
In the structure of (5), even if one supported portion of the torsion bar is fixed, the first torque and the second torque, and the maximum twist angle of the torsion bar are adjusted. If there is no particular problem in both durability and durability, it can be adopted.
On the other hand, if one supported portion of the torsion bar is fixed, there may be a problem in any one of the appropriate first torque and second torque and durability of the torsion bar. In such a case, by adopting the structure of (6), the first torque and the second torque are appropriately adjusted while suppressing the maximum twist angle of the torsion bar and improving the durability. Can be set to
Further, it is conceivable that the flap table according to the present invention further includes a rotary damper that suppresses the rotational speed of the first support portion in the torsion bar support means.
As a result, it is possible to more reliably avoid an impact when the top plate is rotated.
Further, it is conceivable that the flap table according to the present invention further includes the constituent elements shown in the following (7).
(7) A lock mechanism that locks the rotation of the top plate in each of the sideways posture and the standing posture of the top plate and releases the locked state in response to an operation on a predetermined operation unit.
Thereby, it can prevent that the said top plate rotates against a user's will by the said 1st torque and the said 2nd torque.

  According to the present invention, in the flap table, it is possible to reduce the force required for the rotation operation of the top plate and to avoid the impact at the time of the rotation operation of the top plate by a simple configuration as small as possible.

The schematic block diagram of the flap table X which concerns on embodiment of this invention. The front view and side view of the components which comprise the top-plate rotation support mechanism of the flap table X. The block diagram of the top plate rotation support mechanism of the flap table X. FIG. The block diagram of the top-plate rotation support mechanism and locking mechanism of the flap table X. The block diagram of the torsion bar spring mechanism of the flap table X. FIG. Explanatory drawing of the torque generation effect | action of the torsion bar spring mechanism of the flap table X. FIG. Explanatory drawing of the holding angle adjustment mechanism of the torsion bar employable for the flap table X. FIG. The front view and side view of the components which comprise the torsion bar spring mechanism employable as flap table X. The block diagram of the torsion bar spring mechanism employable as the flap table X. FIG. The figure showing an example of the rotation control mechanism of the 1st to-be-supported part of the torsion bar employable as flap table X. The schematic block diagram of the flap table X1 which concerns on 2nd Embodiment of this invention. The schematic block diagram of the flap table X2 which concerns on 3rd Embodiment of this invention. Schematic showing an example of the top plate elastic biasing means realized using a coil spring.

  Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings so that the present invention can be understood. The following embodiment is an example embodying the present invention, and does not limit the technical scope of the present invention.

First, a schematic configuration of the flap table X according to the embodiment of the present invention will be described with reference to FIG.
The flap table X is a table provided with a top plate rotation support mechanism 30 that pivotally supports the top plate 20 so that the top plate 20 can pivot between a lying position when in use and a standing position when not in use. FIG. 1A shows a state in which the top plate 20 is in the sideways posture, and FIG. 1B shows a state in which the top plate 20 is in the standing posture. FIG. 1C shows a state in which the top plate 20 is in an intermediate position between the sideways posture and the standing posture.
The sideways posture of the flap table X is a horizontal posture as shown in FIG. In addition, the sideways posture may be a posture inclined at an angle close to a horizontal posture, such as a drawing table.
The standing posture of the flap table X is a vertical posture as shown in FIG. In addition, the standing posture may be a posture inclined at an angle close to a vertical posture.

The flap table X includes a leg portion 10 including a leg portion 11 in contact with the floor and a support column 12 supported by the leg portion 11, and the top plate rotation support mechanism 30 is provided on the support column 12 of the support leg portion 10. It is attached.
The top plate rotation support mechanism 30 pivotally supports the top plate 20 so as to be rotatable only in an angle range between the angle of the sideways posture and the angle of the standing posture. Hereinafter, the rotation direction in which the top plate 20 moves from the sideways posture to the standing posture is referred to as a standing rotation direction R1, and the opposite rotation direction is referred to as a rotation direction R2. The center line of rotation of the top plate 20 is referred to as a top plate rotation center line P1. The top plate rotation center line P <b> 1 is a line parallel to the lower surface of the top plate 20.
Further, the flap table X locks the rotation of the top plate 20 in each of the sideways posture and the standing posture of the top plate 20 and releases the locked state according to the operation on the lever 42. A lock mechanism 40 is also provided.
Further, as shown in FIG. 1A, the flap table X has a center of gravity Q1 of the rotating portion including the top plate 20 in the lying position and the rotation center line P1 aligned in the vertical direction. Not in. Therefore, when the top plate 20 is in the sideways posture, the top plate rotation support mechanism 30 generates the torque in the sideways rotation direction R2 due to the gravity G1 of the rotation unit including the top plate 20. The rotating part including the top plate 20 is a member that rotates in accordance with the rotation of the top plate 20 and the top plate 20. The members that rotate in response to the rotation of the top plate 20 include, for example, a top plate reinforcing member 21 and a top plate bracket 32 that will be described later.
On the other hand, as shown in FIG. 1B, the flap table X has the center of gravity Q1 of the rotating part including the top plate 20 in the standing posture and the rotation center line P1 aligned in the vertical direction. Not in. Therefore, when the top plate 20 is in the standing posture, in the top plate rotation support mechanism 30, the torque in the standing rotation direction R <b> 1 is generated by the gravity G <b> 1 of the rotation unit including the top plate 20.

The flap table X is characterized in that a torsion bar spring mechanism (not shown in FIG. 1) is provided.
The torsion bar spring mechanism elastically energizes a portion that rotates in conjunction with the rotation of the top plate 20 by a torsion bar, so that the top plate 20 is tilted sideways and raised with respect to the top plate 20. In each of the postures, the top plate rotation support mechanism 30 generates torques N1 and N2 in opposite directions to the torque generated by the gravity of the rotation unit including the top plate 20.
In addition, the torsion bar spring mechanism in the present embodiment causes the torsion bar to twist in the opposite direction when the top plate 20 is in the lateral position and in the standing position.
That is, the torsion bar spring mechanism according to the present embodiment is configured so that the top plate 20 supports the first torque N1 in the upright rotation direction R1 in the top plate rotation support mechanism 30 when the top plate 20 is in the sideways posture or the posture close thereto. Is generated. The first torque N1 is a torque in a direction opposite to the torque in the sideways rotation direction R2 generated by the gravity G1 of the rotation unit including the top plate 20 in the sideways posture. On the other hand, the torsion bar spring mechanism generates the second torque N2 in the sideways rotation direction R2 in the top plate rotation support mechanism 30 when the top plate 20 is in the standing posture or a posture close thereto. The second torque N2 is a torque in a direction opposite to the torque in the standing and turning direction R1 generated by the gravity G1 of the turning portion including the top plate 20 in the standing posture.

Subsequently, with reference to FIG. 2, main four parts constituting the top plate rotation support mechanism 30 will be described. These four parts are a hinge fitting 31, a top plate receiving fitting 32, a hinge pin 33, and a pin retaining fitting 34.
The hinge fitting 31 is a fitting fixed to the upper portion of the support column 12 by welding or the like. As shown in FIG. 2A, the hinge fitting 31 has a fixing portion 31d fixed to the support column 12 and a plate-like support portion 31e. The support portion 31e is formed with a pin through hole 31a, a first engaged portion 31b, and a second engaged portion 31c.
The pin through hole 31a is a through hole through which the hinge pin 33 is inserted, and has a shape that matches the non-circular cross-sectional shape of the hinge pin 33. Thereby, the hinge pin 33 inserted through the pin through hole 31a is supported by the hinge fitting 31 without rotating.
The first engaged portion 31b is a portion with which the engaging member in the lock mechanism 40 is engaged when the top plate 20 is in the sideways posture. The second engaged portion 31c is a portion with which the engaging member in the lock mechanism 40 engages when the top plate 20 is in the standing posture. Details thereof will be described later.

The top plate bracket 32 is a member that is fixed to the lower surface of the top plate 20 and rotates together with the top plate 20. As shown in FIG. 2B, the top plate receiving bracket 32 is formed by folding a metal plate into two, and a gap 32d into which the support portion 31e of the hinge bracket 31 is inserted is formed inside thereof. It is a member.
And the outer surface of the part folded in half in the said top-plate receiving metal fitting 32 becomes the receiving part 32a of the top plate fixed in contact with the lower surface of the said top-plate 20. As shown in FIG.
A circular through hole 32b through which the hinge pin 33 is passed is formed in two opposing side plate portions of the top plate receiving bracket 32.
The hinge pin 33 is a member composed of a support shaft portion 33a and a head portion 33b formed at one end of the support shaft portion 33a. The support shaft portion 33a is a rod-shaped portion having a non-circular cross section. The shape of the pin through hole 31a of the hinge pin 33 is formed to match the cross-sectional shape of the support shaft portion 33a. The shape of the support shaft portion 33a of the hinge pin 33 shown in FIG. 2C is a shape obtained by cutting two side surfaces of a cylindrical member into a flat shape.

The pin retaining bracket 34 is a member that is fixed to the tip portion of the support shaft portion 33 a of the hinge pin 33. The pin retaining metal fitting 34 is a member having a thickness of several millimeters to several tens of millimeters, and a fitting hole 34a for fitting the tip of the support shaft portion 33a of the hinge pin 33 is formed in the center portion thereof. A plurality of bolt holes 34b for attaching a first bar holding metal 52 to be described later are formed around the fitting hole 34a in the pin retaining metal 34.
Further, the screw retaining bracket 34 is formed with two screw holes 34c and 34d penetrating from the side surface to the fitting hole 34. The tip of the screw screwed into the screw holes 34c and 34d presses the side surface of the hinge pin 33 fitted into the fitting hole 34a, so that the pin retaining metal fitting 34 is fixed to the tip of the hinge pin 33. Is done.
FIG. 3 is a configuration diagram of the top plate rotation support mechanism 30 in which the hinge bracket 31, the top plate receiving bracket 32, the hinge pin 33, and the pin retaining bracket 34 are combined.
As shown in FIG. 3, the top plate bracket 32 is arranged so that the support portion 31 e of the hinge bracket 31 is inserted into a gap inside thereof. Further, the support shaft portion 33 a of the hinge pin 33 is inserted in communication with both the through hole 32 b of the top plate receiving bracket 32 and the pin through hole 31 a of the hinge bracket 31. Further, the pin retaining metal fitting 34a is attached to the distal end portion of the support shaft portion 33a inserted into the through hole 32b and the pin through hole 31a so that the distal end portion fits into the insertion hole 34a. . The pin retaining metal fitting 34a is fixed to the support shaft portion 33a by screws 34e and 34f screwed into the screw holes 34c and 34d.
As a result, the hinge pin 33 is arranged such that its axis is along the top plate rotation center line P1.

Further, the top plate rotation support mechanisms 30 as shown in FIG. 3 are arranged at two locations along the top plate rotation center line P1.
However, the structure for restricting the rotation of the hinge pin 33 is required only in one of the two locations on the side connected to the torsion bar 51 described later. Accordingly, in the top plate rotation support mechanism 30 on the side where the rotation of the hinge pin 33 does not need to be restricted, the support shaft portion 33a of the hinge pin 33 may be cylindrical. Further, the shape of each of the pin through hole 31a of the hinge metal fitting 31 corresponding to the hinge pin 33 and the fitting hole 34a of the pin retaining metal fitting 34 may be circular.

Next, the top plate rotation support mechanism 30 and the lock mechanism 40 will be described with reference to the configuration diagram shown in FIG. FIG. 4A shows a state in which the top plate 20 is in the sideways posture. FIG. 4B shows a state where the top plate 20 is in the standing posture. FIG. 4C shows a state in which the top board 20 is in an intermediate position between the sideways posture and the standing posture.
As shown in FIG. 4, the lock mechanism 40 includes a support shaft 43, an engagement member 41, an operation lever 42, and a spring (not shown).
The support shaft 43 is supported by the top plate bracket 32, and the engagement member 41 is rotatably supported by the support shaft 43. Further, the engaging member 41 supported by the support shaft 43 is elastically urged so as to contact the hinge fitting 31 by a spring (not shown).
The operation lever 42 is connected to the engagement member 41 directly or via the support shaft 43. Accordingly, when the operation lever 42 is manually rotated, the engagement member 41 is rotated against the urging force of the spring.

When the top plate 20 is in the sideways posture, as shown in FIG. 4A, the first engaging portion 41a which is a part of the engaging member 41 is moved by the biasing force of the spring. The metal fitting 31 is engaged with the first engaged portion 31b. Thereby, the top plate 20 is locked so as not to rotate from the state of the sideways posture. Further, by the operation of the operation lever 42, the engagement between the first engaging portion 41a and the first engaged portion 31b is released, and the rotation lock state of the top plate 20 is released. .
FIG. 4C shows a state where the locked state of the rotation of the top plate 20 is released by the operation of the operation lever 42, and the top plate 20 is in the intermediate posture state.
On the other hand, when the top plate 20 is in the upright posture, as shown in FIG. 4B, the second engaging portion 41b, which is a part of the engaging member 41, is caused by the biasing force of the spring. The hinge fitting 31 is engaged with the second engaged portion 31c. As a result, the top plate 20 is locked so as not to rotate from the standing posture. Further, by the operation of the operation lever 42, the engagement between the second engagement portion 41b and the second engaged portion 31c is released, and the rotation lock state of the top plate 20 is released. .

Next, the torsion bar spring mechanism 50 will be described with reference to the block diagram shown in FIG.
The torsion bar spring mechanism 50 includes a torsion bar 51, which is a bar-like member having elasticity in the torsion direction, a first bar holding fitting 52, and a second bar holding fitting 53.
The torsion bar 51 is a bar member (for example, a square bar) made of metal such as iron, stainless steel, or steel.
The first bar holding metal fitting 52 and the second bar holding metal fitting 53 hold the two supported portions of the torsion bar 51, so that the torsion bar 51 has an axis centered on the top plate. It supports so that the dynamic centerline P1 may be met. One of the two supported parts is restricted in rotation, and the other rotates in conjunction with the rotation of the top plate 20. Hereinafter, of the two supported parts of the torsion bar 51, the supported part on the side whose rotation is restricted is referred to as the first supported part and the supported part on the side that rotates in conjunction with the rotation of the top plate 20. The support part is referred to as a second supported part.
The first bar holding metal 52 is a member having a thickness of, for example, about several mm to several tens of mm, and is fixed to the pin retaining metal 34. Further, the first bar holding metal fitting 52 is formed with a fitting hole 52a into which one end portion of the torsion bar 51 which is the first held portion is fitted. The first bar holding metal 52 is fixed to one of the hinge pins 33 whose rotation is restricted among the hinge pins 33 in the top plate rotation support mechanism 30 provided at two places. It is fixed to the retaining bracket 34.
Further, the first bar holding metal fitting 52 is formed with a through hole 52b through which a bolt for fixing the first bar holding metal fitting 52 to the pin retaining metal fitting 34 is inserted. The first bar holding bracket 52 is fixed to the pin retaining bracket 34 with a bolt, so that the holding angle around the top plate rotation center line P1 is a predetermined angle. Is done.

As described above, the pin retaining bracket 34 is fixed to the hinge pin 33 that does not rotate about the top plate rotation center line P1. Therefore, the pin retaining bracket 34 does not rotate even when the top plate 20 rotates. Further, since the first bar holding metal 52 is fixed to the pin retaining metal 34, it does not rotate even if the top plate 20 is rotated.
Accordingly, the first bar holding bracket 52 fixes one of the two supported portions of the torsion bar 51 at an angle in the circumferential direction around the top plate rotation center line P1. To support. The first bar holding metal fitting 52 is an example of the first support portion that supports one of the two supported portions of the torsion bar 51 while restricting the rotation thereof.

The second bar holding metal 53 is a member in which, for example, a support portion 53a and a pedestal portion 53b having a thickness of about several millimeters to several tens of millimeters are integrally formed. The pedestal portion 53 b is fixed to the top plate reinforcing member 21 fixed to the lower surface of the top plate 20. The top plate reinforcing member 21 is, for example, a metal square pipe fixed to the lower surface of the top plate 20 with screws or the like.
Further, the support portion 53a of the second bar holding metal 53 is formed with a fitting hole 53c into which the second held portion of the torsion bar 51 is fitted. The shape of the insertion hole 53 c is the same as the cross-sectional shape of the second held portion of the torsion bar 51.
The pedestal portion 53b of the second bar holding metal 53 is formed with a through hole 52d through which a bolt for fixing the second bar holding metal 53 to the top plate reinforcing member 21 is inserted. The second bar holding metal 53 is rotated around the top plate rotation center line P1 in conjunction with the rotation of the top plate 20 by being fixed to the top plate reinforcing member 21 by bolts. To do. That is, the second bar holding metal 53 supports the second supported portion of the torsion bar 51 so as to rotate in conjunction with the rotation of the top plate 20. The second bar holding metal 53 is an example of the second support part that supports the other of the two supported parts of the torsion bar 51.

The first bar holding bracket 52 and the second bar holding bracket 53 are arranged such that the torsion bar 51 is positioned when the top plate 20 is in a predetermined angle between the sideways posture and the standing posture. The torsion bar 51 is supported such that the first to-be-supported portion and the second to-be-supported portion of the torsion bar 51 are supported at the same angle. . As in the case of the flap table X, when the first bar holding bracket 52 supports the torsion bar 51 at a fixed support angle, the top plate 20 in a state where the top plate 20 is not twisted is used. The support angle is a certain angle.
Therefore, in the torsion bar spring mechanism 50, the first bar holding metal 52 and the second bar holding metal 53 have a support angle of the first supported part and the second supported part by them. Due to the difference, the torsion bar 51 is supported so that the torsion bar 51 is twisted in the opposite direction depending on whether the top plate 20 is in the horizontal position or in the standing position.

FIG. 6 is an explanatory view of the torque generating action of the torsion bar spring mechanism 50. FIG. 6 is a view of the torsion bar spring mechanism 50 as viewed from the direction of the second bar holding bracket 52.
In the state of FIG. 6A in which the top plate 20 is in the sideways posture, the torsion bar 51 is configured such that the second supported portion is rotated sideways with respect to the first supported portion. It is held twisted in the direction R2. As a result, the torsion bar 51 generates the first torque N1 in the upright rotation direction R1 with respect to the top plate 20 in the sideways posture or a posture close thereto. The first torque N1 is a torque that elastically biases the top plate 20 in the sideways posture toward the standing posture side.
On the other hand, in the state shown in FIG. 6C in which the top plate 20 is in the standing posture, the torsion bar 51 has the second supported portion with respect to the first supported portion. It is held twisted in the rotation direction R1. As a result, the torsion bar 51 generates the second torque N2 in the sideways rotation direction R2 with respect to the top plate 20 in the standing posture or a posture close thereto. The second torque N2 is a torque that elastically urges the top plate 20 in the standing posture to lie down and to the posture side.
Further, in the state of FIG. 6B in which the top plate 20 is in a specific intermediate position between the sideways posture and the standing posture, the torsion bar 51 is not twisted. At this time, the torsion bar 51 does not generate torque with respect to the top plate 20.

Hereinafter, the effect of the flap table X will be described.
First, consider a case where the user performs an operation of rotating the top plate 20 from the standing posture to the sideways posture in order to use the flap table X.
In this case, when the top plate 20 rotated by the user approaches the sideways posture that is the first rotation end, the first torque N depends on the weight of the top plate 20 and the user's operation force. It acts to suppress momentum and the rotational speed of the top plate 20 is reduced. As a result, it is possible to avoid or reduce the occurrence of a strong impact on the flap table X due to excessive rotation of the top plate 20 when the top plate 20 reaches the sideways posture.
Further, when the user starts the rotation of the top plate 20 against the frictional resistance of the hinge pin 33 that is a support shaft of the top plate 20, the second torque N2 is applied to the user. It acts in a direction that assists the turning operation. As a result, even when the top plate 20 is large and heavy, or when the user is powerless, the top plate 20 in the standing posture can be easily rotated.

Next, consider a case where the user performs an operation of rotating the top plate 20 from the lateral position to the standing position in order to clear the flap table X.
In this case, when the top plate 20 rotated by the user approaches the standing posture that is the second rotation end, the second torque N2 is caused by the weight of the top plate 20 and the operation force of the user. It acts to suppress momentum and the rotational speed of the top plate 20 is reduced. As a result, when the top plate 20 reaches the standing posture, it is possible to avoid or reduce the occurrence of a strong impact on the flap table X due to excessive turning momentum of the top plate 20.
Further, when the user lifts the top plate 20 against the frictional resistance of the hinge pin 33 or the weight of the top plate 20 in the lying position, the first torque N1 is lifted by the user. Acts in a direction to assist the operation. As a result, even when the top plate 20 is large and heavy, or when the user is powerless, the top plate 20 in the lying position can be easily rotated.
As described above, in the flap table X, the top plate 20 is rotated by the torsion bar 51 when the top plate 20 is rotated in either the standing posture or the horizontal posture. A torque that assists the force required to start the movement and a torque that suppresses the momentum of rotation of the top plate 20 and suppresses the generation of a strong impact are generated.
Moreover, the torsion bar 51 can generate a strong torque by adopting a relatively thin rod-like member, and the structure for supporting it is simple. Therefore, the flap table X can realize a reduction in force required for the rotation operation of the top plate 20 and avoidance of an impact during the rotation operation of the top plate 20 with a very small and simple configuration.

By the way, when the size and weight of the top plate 20 and the member that reinforces it, the structure of the top plate rotation support mechanism 30 and the like are different, the flap table has appropriate first torque N1 and second torque. The size of can vary.
The magnitudes of the first torque N1 and the second torque N2 generated by the twisting of the torsion bar 51 are the material, thickness, twisting angle of the torsion bar 51, and the two supported parts. It is determined by the length L between them.
In the plurality of types of flap tables, it is desirable that the first torque N1 and the second torque N1 appropriate to the type of the flap table can be set while sharing the parts such as the torsion bar 51.
Hereinafter, a mechanism for facilitating the setting of the first torque N1 and the second torque N1 according to the type of the flap table will be described.

First, referring to FIG. 5, the position of the second bar holding metal 53 for supporting the second supported portion of the torsion bar 51 in the direction along the top plate rotation center line P1 is variable. An example of the support position variable mechanism to be supported will be described.
As shown in FIG. 5, the top plate reinforcing member 21 extending in parallel to the top plate rotation center line P <b> 1 is fixed to the lower surface of the top plate 20. The top plate reinforcing member 21 is provided with a screw hole 21a for fixing the second bar holding metal 53 with a bolt. A plurality of sets of the screw holes 21a are arranged in a direction parallel to the top plate rotation center line P1. As a result, the first torque N1 and the second torque N2 can be changed only by changing the fixing position of the second bar holding metal 53 to the top plate reinforcing member 21 with the bolt according to the type of the flap table. Both can be strengthened or weakened. Therefore, for example, with respect to a plurality of types of flap tables having different sizes of the top plate 20, it is possible to set appropriate magnitudes of the first torque N1 and the second torque N2 using the same components.
The top plate reinforcing member 21 and the bolts provided with a plurality of sets of the screw holes 21a and fixed to the top plate 20 are an example of the support position variable mechanism.

Next, referring to FIG. 7, the first bar holding bracket 52 that supports the first supported portion of the torsion bar 51 is moved in the circumferential direction about the top plate rotation center line P1. An example of a support angle variable mechanism that variably supports the angle at will be described.
FIG. 7A shows an example of the pin retaining bracket 34. In this pin retaining metal fitting 34, a plurality of sets of bolt holes 34b for attaching the first bar holding metal fitting 52 are formed around the fitting hole 34a.
7 (b) to 7 (d) show the first holding metal fitting 52 fixed to the pin retaining metal fitting 52 with bolts using different combinations of the bolt holes 34b. Yes.
With the pin retaining bracket 34 and the first bar holding bracket 52 shown in FIG. 7, the angle of the first bar holding bracket 52 in the circumferential direction about the top plate rotation center line P1 is set. Can be variably fixed.
The mechanism shown in FIG. 7 makes it possible to balance the first torque N1 and the second torque N2 by making the support angle of the top plate 20 variable when the torsion bar 51 is not twisted. This is a mechanism that makes (ratio) variable. As a result, parts such as the torsion bar 51 are shared in a plurality of types of flap tables in which the balance between the moment of inertia of the top plate 20 in the lying position and the moment of inertia of the top plate 20 in the standing posture is different. However, it is possible to set an appropriate balance between the first torque N1 and the second torque N1 according to the type of the flap table.
Note that the pin retaining metal fitting 34, the first bar holding metal fitting 52, and the bolt shown in FIG. 7 are examples of the support angle varying mechanism.

Next, the torsion bar spring mechanism 50 ′ that can be employed in the flap table X will be described with reference to FIGS. Hereinafter, only portions of the torsion bar spring mechanism 50 ′ that are different from the torsion bar spring mechanism 50 will be described.
As shown in FIG. 8, the torsion bar spring mechanism 50 ′ includes a damper connecting bracket 55 (FIG. 8A), a bi-directional rotary damper 54 (FIG. 8B), and the pin retaining bracket. 34 (FIG. 8C). The pin retaining bracket 34 is the same as that provided in the torsion bar spring mechanism 50 (see FIG. 2D).
The rotary damper 54 is a bi-directional rotary damper. As the rotary damper 54, a viscous resistance type damper such as an oil damper or a friction resistance type damper may be employed.

As shown in FIG. 8B, the rotary damper 54 includes a main body portion 54a and a rotating shaft portion 54b. The rotary shaft portion 54b is formed with a through hole 54c into which the support shaft portion 33a is fitted when the support shaft portion 33a of the hinge pin 33 is inserted. The cross-sectional shape of the through hole 54c is the same as that of the non-circular support shaft portion 33a. The rotary damper 54 rotates relative to the first object fixed to the main body 54a and the second object fixed to the rotating shaft 54b by fitting into the through hole 54c. Torque is generated that suppresses the speed.
The main body 54 a of the rotary damper 54 is fixed to the top plate receiving bracket 32 via the damper connecting bracket 55. Therefore, the main body portion 54a of the rotary damper 54 is provided with a bolt hole 54d for fixing (screwing) the main body portion 54a to the top plate receiving bracket 32 with a bolt. Similarly, the damper connecting metal 55 is provided with bolt holes 55b for fixing (screwing) the damper connecting metal 55 and the rotary damper 54 to the top plate receiving metal 32 with bolts.
Furthermore, the damper coupling metal 55 is provided with a through hole 55a through which the support shaft portion 33a of the hinge pin 33 is rotatably inserted.
The damper connecting bracket 55 is for reinforcing the mounting portion of the rotary damper 54 in the top plate receiving bracket 32. Therefore, if the strength of the top plate receiving metal 32 is sufficient, the main body portion 54 a of the rotary damper 54 may be directly attached to the top plate receiving metal 32.

  In the torsion bar spring mechanism 50 ′, the hinge pin 33 fitted and inserted into the rotary shaft portion 54 b is interlocked with the rotation of the top plate 20 via the damper coupling metal 55. The first supported portion of the torsion damper 51 that rotates is connected. Accordingly, in the torsion bar spring mechanism 50 ′, the rotation of the rotating shaft portion 54 b is restricted (fixed), and the main body portion 54 a rotates according to the rotation of the top plate 20. That is, the rotary damper 54 is a rotary damper that suppresses the rotation speed of the first bar holding metal 52.

The pin retaining bracket 34 is fixed to the tip of the hinge pin 33 for retaining the hinge pin 33. However, in this example in which the torsion bar spring mechanism 50 ′ is employed, the pin retaining bracket 34 is the rotation of the top plate receiving bracket 32, the hinge bracket 31, the damper connecting bracket 55, and the rotary damper 54. The hinge pin 33 inserted through the shaft portion 54b is fixed to the distal end portion of the support shaft portion 33a.
Further, in the torsion bar spring mechanism 50 ', the rotation is performed via the second bar holding metal 52 and the first bar holding metal 52, similarly to the torsion bar spring mechanism 50 shown in FIG. The restricted hinge pin 33 and the first supported portion of the torsion bar 51 are connected.

FIG. 9 shows the torsion bar spring mechanism 50 ′ to which the damper coupling metal 55, the rotary damper 54, and the pin retaining metal 34 are attached.
The torsion bar 51 in the torsion bar spring mechanism 50 ′ is set so that the urging force by twisting cancels the torque due to the gravity G 1 of the rotating part including the top plate 20. Therefore, the force required for the rotation of the top plate 20 is very small.
However, the operator may apply more force than necessary to rotate the top plate 20, and the extra force may cause an impact when the top plate 20 is rotated. On the other hand, in the example shown in FIG. 9, when an extra force is applied to the rotation of the top plate 20, the extra force is absorbed (released as heat) by the resistance inside the rotary damper 54. In addition, as the extra force increases, the energy absorbed by the rotary damper 54 increases. Therefore, the rotational speed of the top plate 20 is suppressed, and the impact on the flap table is mitigated. Further, since the rotary damper 54 only needs to absorb the extra force applied by the operator, a relatively small capacity (resistance force) is sufficient. Therefore, the addition of the rotary damper 54 has little influence on the occupied space, weight, and cost of the lap table X.

On the other hand, in the torsion bar spring mechanisms 50, 50 ′, the first supported portion of the torsion bar 51 is made to be a circle around the top plate rotation center line P1 by the first bar holding fitting 52. A mechanism that restricts and supports the angle in the circumferential direction within a predetermined range smaller than the angle range of rotation of the top plate 20 is conceivable.
Hereinafter, an embodiment of the rotation restricting mechanism of the first supported portion of the torsion bar 51 that can be employed in the flap table X will be described with reference to FIG.
In the hinge fitting 31 shown in FIG. 10, the pin through-hole 31a ′ through which the support shaft portion 33a of the hinge pin 33 having a non-circular cross section is inserted has a rotational direction relative to the cross-sectional shape of the support shaft portion 33a. Are formed with some play (room). As a result, the support shaft portion 33a is rotatable within the play regulation range. Therefore, when the top plate 20 is rotated, the first supported portion of the torsion bar 51 rotates only within a very small angle range corresponding to the play. Then, when the top plate 20 rotates beyond the restricted angular range, the torsion bar 51 is twisted.

  When the first supported portion of the torsion bar 51 is fixed like the torsion bar spring mechanisms 50 and 50 ', the appropriate first torque N1 and second torque N2, and the torsion bar 51 There may be a problem in either of the durability and the durability. In such a case, by adopting the hinge metal fitting 31 shown in FIG. 10, the first torsion bar 51 and the first torque N1 and the first The torque N2 of 2 can be set appropriately.

In the embodiment described above, the torsion bar spring mechanisms 50 and 50 ′ have torques in opposite directions with respect to the top plate 20, depending on whether the top plate 20 is in the sideways posture or the standing posture. In this example, N1 and N2 were generated.
In addition, the torsion bar spring mechanisms 50 and 50 ′ generate the first torque N1 that resists the torque due to the gravity G1 of the rotating portion including the top plate 20 when the top plate 20 is in the sideways posture. It is also conceivable that no torque is generated by the torsion bar 51 when in the standing posture. In this case, the torsion bar 51 is in a state in which twisting does not occur when the top plate 20 is in the standing posture, and a state in which large twisting occurs as the top plate 20 approaches the sideways posture. Such a state can be realized by adjusting the holding angle of the first bar holding fitting 52 and the second bar holding fitting 53.
In FIG. 11, the schematic block diagram of flap table X1 which concerns on 2nd Embodiment of this invention is shown. In addition, the broken line in FIG. 11 shows a state when the top plate 20 is in the standing posture. In the flap table X1, the standing posture of the top plate 20 is not a vertical posture, but is inclined at an angle close thereto. In the flap table X <b> 1 shown in FIG. 11, the top plate 20 in the standing posture is inclined to the sideward posture side rather than the vertical posture.
In the flap table X1, when the top plate 20 is in the sideways posture, as in the flap table X, the top plate rotation support mechanism 30 causes the gravity G1 of the rotating portion including the top plate 20 to move. Torque is generated in the sideways rotation direction R2.
On the other hand, in the flap table X1, when the top plate 20 is in the upright position, the center of gravity Q1 of the rotating portion including the top plate 20 and the rotation center line P1 are aligned in the vertical direction, so In the plate rotation support mechanism 30, no torque is generated by the gravity G1. And the torque by the gravity G1 increases as the top 20 approaches the sideways posture. Therefore, as shown in FIG. 11, the flap table X1 is set so that the second torque N2 is not generated by the torsion bar spring mechanisms 50, 50 ′ when the top plate 20 is in the standing posture. ing. The first torque N1 in the upright rotation direction R1 by the torsion bar spring mechanisms 50, 50 ′ is set to increase as the top plate 20 approaches the sideways posture. As a result, the first torque N1 by the torsion bar spring mechanisms 50, 50 ′ acts in a direction to support the weight of the top plate 20.
In the flap table X1, it is also conceivable that when the top plate 20 is in the standing posture, the torque due to the gravity G1 falls on the top plate rotation support mechanism 30 and acts in the rotation direction R2. In that case, the torsion bar spring mechanisms 50, 50 ′ are configured such that the second torque N2 in the upright rotation direction R1 in the top plate rotation support mechanism 30 when the top plate 20 is in the upright posture. It is also conceivable that it is set to generate

The present invention is also applicable to a flap table X2 as shown in FIG. FIG. 12 is a schematic configuration diagram of a flap table X2 according to the third embodiment of the present invention. 12A shows a state when the top plate 20 is in the sideways posture, and FIG. 12B shows a state when the top plate 20 is in the standing posture.
In the flap table X2, when the top plate 20 is in the standing posture, in the top plate rotation support mechanism 30, as with the flap table X, the gravity G1 of the rotating part including the top plate 20 is used. Torque is generated in the standing rotation direction R1.
On the other hand, in the flap table X2, the center of gravity Q1 of the rotating part including the top plate 20 and the rotation center line P1 are aligned in the vertical direction when the top plate 20 is in the sideways posture. In the plate rotation support mechanism 30, no torque is generated by the gravity G1. And the torque by the gravity G1 increases as the top plate 20 approaches the standing posture. Therefore, as shown in FIG. 12, the flap table X2 is set so that the first torque N1 is not generated by the torsion bar spring mechanisms 50, 50 ′ when the top plate 20 is in the sideways posture. ing. The second torque N2 in the lateral rotation direction R2 by the torsion bar spring mechanisms 50, 50 ′ is set to increase as the top plate 20 approaches the standing posture. As a result, the second torque N2 by the torsion bar spring mechanisms 50, 50 ′ acts in a direction to support the weight of the top plate 20.

  Further, depending on the positional relationship between the rotation center line P1 and the gravity center position of the rotation unit including the top plate 20, the top plate 20 is in any position within the range from the standing posture to the sideways posture. In addition, a flap table in which the torque in the same rotation direction (R1 or R2) is generated by the gravity G1 of the rotation part including the top plate 20 in the top plate rotation support mechanism 30 is also conceivable. In such a case, when the torsion bar 51 is in any position in the range from the standing posture to the sideways posture, the torque in the direction opposite to the torque due to the gravity G1 (always in the same direction) It is also conceivable that the torque is set so as to be generated.

Further, the top plate 20 or a portion interlocking with the rotation of the top plate 20 is elastically biased to generate a torque in a direction opposite to the torque generated by the gravity G1 of the rotation unit including the top plate 20. As the plate elastic biasing means, a spring mechanism other than the torsion bar 51 such as a coil spring or a spiral spring may be employed.
FIG. 13 is a schematic diagram showing an example of the top plate elastic biasing means realized by using the coil spring 57. FIGS. 13A, 13B, and 13C show states when the top plate 20 is in the standing posture, the intermediate posture between the standing posture and the lying posture, and the lying posture, respectively. Represent.
In the top plate elastic urging means shown in FIG. 13, the coil spring 57 elastically urges the rotating portion 56 that is interlocked with the rotation of the top plate 20. The coil spring 57 is configured so that the gravity G1 of the rotating part including the top plate 20 in the rotation support mechanism of the top plate 20 when the top plate 20 is in the sideways posture (FIG. 13C). Torque N1 in a direction opposite to the torque in the lateral rotation direction R2 generated by the above is generated. Further, the coil spring 57 is arranged in the upright rotation direction R1 generated by the gravity G1 in the rotation support mechanism of the top plate 20 when the top plate 20 is in the upright posture (FIG. 13A). Torque N2 in the opposite direction to the torque is generated. Further, in the state shown in FIG. 13B in which no torque is generated by the gravity G1 including the top plate 20 in the rotation support mechanism of the top plate 20, no torque is generated by the coil spring 57.
The embodiment shown in FIG. 13 is also an example of the embodiment of the present invention. However, the top plate elastic urging means employing a coil spring requires a relatively large rotating portion 56 and requires a space for arranging the coil spring. difficult.
In addition to the example shown in FIG. 13, the top plate elastic biasing means employing a spiral spring is also conceivable.

  INDUSTRIAL APPLICABILITY The present invention can be used for a flap table that can rotate a top plate.

X, X1, X2: Flap table 10: Supporting leg 20: Top plate 21: Top plate reinforcing member 30: Top plate rotation support mechanism 31: Hinge bracket 32: Top plate bracket 33: Hinge pin 34: Pin retaining bracket 40 : Lock mechanism 41: Engaging member 42: Operation lever 43: Support shafts 50, 50 ': Torsion bar spring mechanism 51: Torsion bar 52: First bar holding bracket 53: Second bar holding bracket 54: Rotary damper 55 : Damper connecting metal fitting 56: rotating part 57: coil spring P1: top plate rotation center line

Claims (7)

A top plate rotation support mechanism that pivots on the top plate so that the top plate can be rotated between a standing posture and a standing posture;
By elastically urging the top plate or a portion interlocking with the rotation of the top plate, the top plate is supported by the top plate rotation support mechanism when the top plate is in at least one of the sideways posture and the standing posture. and a top plate resilient biasing means for generating a torque in the opposite direction of the torque generated by gravity of the rotating portion including a plate,
The top plate elastic biasing means is
A torsion bar supported by two supported portions along the centerline of rotation of the top plate;
One of the two supported parts of the torsion bar is supported by the first support part with its rotation restricted, and the other is supported so that the other rotates in conjunction with the rotation of the top plate. Torque generated by the gravity of the rotating portion including the top plate in the top plate rotation support mechanism on the torsion bar when the top plate is in at least one of the sideways posture and the standing posture. And a torsion bar support means for generating a twist that generates torque in the opposite direction,
A flap table comprising a support position variable mechanism that variably supports the second support portion of the torsion bar support means in a direction along a center line of rotation of the top plate . The torsion bar support means, claim 1, wherein the top plate is formed by supporting the torsion bar to cause torsional the opposite direction to the torsion bar at the time which is the standing posture as when it is the sideways posture Flap table as described in. Said first support portion of the torsion bar supporting means, formed by an angle in the circumferential direction around the center line of rotation of the top plate comprises a support angle variable mechanism for variably supported claim 1 or The flap table according to claim 2 . The first support portion of the torsion bar support means fixes one of the two supported portions of the torsion bar at an angle in a circumferential direction centering on the rotation center line of the top plate. The flap table according to claim 1 or 2 , wherein the flap table is supported. The first support part of the torsion bar support means has one of the two supported parts of the torsion bar at an angle in a circumferential direction centered on a rotation center line of the top plate. The flap table according to claim 1 or 2 , wherein the flap table is supported by being regulated within a predetermined range smaller than an angular range of rotation of the top plate. The flap table according to any one of claims 1 to 5 , further comprising a rotary damper that suppresses a rotation speed of a portion that rotates in conjunction with rotation of the top plate. A lock mechanism that locks the rotation of the top plate in each of the sideways posture and the standing posture of the top plate and releases the locked state in response to an operation on a predetermined operation unit. The flap table in any one of Claims 1-6 .

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