JP5912793B2 - Support mechanism - Google Patents

Description

  The present invention relates to a support mechanism disposed between a base body and a movable body that is rotatably supported with respect to the base body.

  An open / close lid device has been proposed in which a torsion spring is disposed between an ashtray main body and a lid capable of opening and closing the opening of the ashtray main body, like an ashtray disclosed in Patent Document 1. The torsion spring has one of two linear portions protruding from the coiled portion pivoted to a locking hole formed in the ashtray body, and the other linear portion is a locking formed on the lid bracket. It is pivotally attached to the hole. The torsion spring is configured such that the angle formed by both linear portions becomes smaller than the natural state (no load state) in both the fully closed state and the fully open state of the lid. That is, the opening / closing lid device keeps the lid in the fully closed state by urging to the opposite side to the opening direction with the torsion spring in the fully closed state of the lid, and to the opposite side to the closing direction with the torsion spring in the fully opened state of the lid. By energizing, the lid is kept fully open. In addition, when the lid is gradually opened from the fully closed state, the torsion spring turns around the ashtray main body, and the opening of both linear parts becomes smaller, so that the lid is attached in the direction opposite to the opening direction. Be forced. Then, the direction in which the torsion spring urges is switched on the boundary of the turnover state in which the end on the lid side of the torsion spring, the pin supporting the lid, and the end on the ashtray main body side of the torsion spring are positioned on a straight line, The lid is biased in the opening direction by a torsion spring.

Japanese Utility Model Publication No. 63-16939

  When the opening / closing lid device is in the fully closed state or the fully open state, the holding force of the lid is determined by the size of the angle formed by the two linear portions of the torsion spring. In other words, if the angle formed by the two linear portions of the torsion spring is smaller than the natural state, the spring force of the torsion spring acts on the lid so that the lid can be held strongly. On the other hand, if the angle formed by the two linear portions of the torsion spring is close to the natural state, the spring force of the torsion spring does not act much on the lid, and the force for holding the lid becomes weak. However, even if the angle formed by the two linear portions of the torsion spring is set to be the same in both the fully closed state and the fully open state, the spring force does not always act on the lid in the fully closed state. It is difficult to adjust the torsion spring because the urging force becomes weak in both the open state and the full open state, the urging force becomes too strong in both of them, or the urging force of only one of them becomes strong. In addition, if the opening / closing lid device is configured to be a torsion spring biased to hold in the fully closed state and the fully opened state, the spring force of the torsion spring acts also when the lid is opened and closed, so that the operation load increases when the lid is opened and closed. The operation feeling of the lid will be deteriorated.

  That is, the present invention has been proposed in order to suitably solve these problems in the prior art, and can support the movable body appropriately in both the first posture and the second posture. The purpose is to provide.

In order to overcome the above-mentioned problems and achieve the intended object, the support mechanism of the invention according to claim 1 of the present application is:
In a support mechanism provided between the base body and a movable body that is rotatably supported with respect to the base body and rotates between the first posture and the second posture.
A first and second torsion that is rotatably supported on one side of the arm and supported on the side of the movable body and pivots as the movable body rotates. With springs,
Both torsion springs urge the movable body in the first posture in a first biasing direction opposite to the rotation direction toward the second posture, and the movable body in the second posture in the first posture. Urging in the second urging direction opposite to the turning direction toward the urging direction, and the urging direction is switched during the turning of the movable body
The first torsion spring is configured such that an angle formed by both arms in the first posture is larger than an angle formed by both arms in the second posture;
The second torsion spring is configured such that an angle formed by both arms in the first posture is smaller than an angle formed by both arms in the second posture ;
Along with the rotation of the movable body, the first torsion spring straddles the first straight line connecting the rotation center of the movable body and the support point of one arm part, and the support point of the other arm part. And the second torsion spring is configured such that the support point of the other arm portion is displaced across the second straight line connecting the rotation center of the movable body and the support point of the one arm portion. And
The rotation angle of the movable body at the first turning point where the support point of the other arm portion in the first torsion spring overlaps the first straight line, and the support point of the other arm portion in the second torsion spring are The gist is that the movable body is configured to deviate from the rotation angle at the second turning point that overlaps the second straight line .
According to the first aspect of the present invention, since the spring force applied by the second torsion spring in the first posture is larger than that in the second posture, the spring force applied by the first torsion spring in the first posture is greater than that in the second posture. Although it is small, the movable body can be appropriately held in the first posture by the spring force added in the same direction by the first torsion spring and the second torsion spring. Similarly, the second torsion spring makes the spring force applied in the second posture smaller than the first posture, but the first torsion spring makes the spring force applied in the second posture larger than the first posture. The movable body can be appropriately held in the second posture by the spring force added in the same direction by the first torsion spring and the second torsion spring. In addition, each torsion spring does not need to have the same angle formed by both arms in the first and second postures, so each torsion spring has a high degree of freedom in setting each torsion spring. The operational feeling of the movable body due to the urging of the torsion spring can be adjusted appropriately.
Furthermore, since the turning point of both torsion springs is shifted, the operation load on the movable body can be reduced.

In the invention according to claim 2 , the other torsion spring is biased in one biasing direction at the turning point of one torsion spring, and the one torsion spring is biased in the other biasing point at the turning point of the other torsion spring. Configured to energize
At least one turning point of both torsion springs, the biasing force acting opposite to the biasing direction of the other torsion spring among the biasing forces of one torsion spring that fluctuates around the turning point is applied to the other torsion spring. The gist is that it is configured to be smaller than the power .
According to the invention of claim 2, the combined urging force of both torsion springs changes so that the neutral point where the urging force of the first torsion spring and the urging force of the second torsion spring balance is one place. The body can be rotated smoothly.

In the invention according to claim 3, when the urging force is peaked in the first urging direction by the first torsion spring , an urging force weaker than the urging force at the peak is applied by the second torsion spring in the second urging direction. The gist is that it is configured to be applied to.
According to the invention of claim 3, the second torsion spring is biased so as to cancel the biasing force of the first torsion spring applied in the direction of resistance when the movable body is rotated from the first position to the second position. Therefore, the movable body can be easily rotated.

In the invention according to claim 4, the movable body has a center of gravity located above the rotation center of the movable body in the first posture, and a center of gravity in the second posture rather than a center of gravity position in the first posture. Rotate so that
The gist is that the urging force obtained by combining all the torsion springs is configured such that the range in the first urging direction is wider than the range in the second urging direction.
According to the invention which concerns on Claim 4, when rotating a movable body against a dead weight from a 2nd attitude | position to a 1st attitude | position, it can assist by the urging | biasing force of both torsion springs.

Similarly, in order to overcome the above-mentioned problem and achieve the intended purpose, the support mechanism of the invention according to claim 5 of the present application is:
In a support mechanism provided between the base body and a movable body that is rotatably supported with respect to the base body and rotates between the first posture and the second posture.
A first and second torsion that is rotatably supported on one side of the arm and supported on the side of the movable body and pivots as the movable body rotates. With springs,
Both torsion springs urge the movable body in the first posture in a first biasing direction opposite to the rotation direction toward the second posture, and the movable body in the second posture in the first posture. Urging in the second urging direction opposite to the turning direction toward the urging direction, and the urging direction is switched during the turning of the movable body
The first torsion spring is configured such that an angle formed by both arms in the first posture is larger than an angle formed by both arms in the second posture;
The second torsion spring is configured such that an angle formed by both arms in the first posture is smaller than an angle formed by both arms in the second posture;
When the urging force is peaked in the first urging direction by the first torsion spring, the urging force weaker than the urging force at the peak is applied in the second urging direction by the second torsion spring. The gist.
According to the fifth aspect of the present invention, since the spring force applied by the second torsion spring in the first posture is larger than that in the second posture, the spring force applied by the first torsion spring in the first posture is greater than that in the second posture. Although it is small, the movable body can be appropriately held in the first posture by the spring force added in the same direction by the first torsion spring and the second torsion spring. Similarly, the second torsion spring makes the spring force applied in the second posture smaller than the first posture, but the first torsion spring makes the spring force applied in the second posture larger than the first posture. The movable body can be appropriately held in the second posture by the spring force added in the same direction by the first torsion spring and the second torsion spring. In addition, each torsion spring does not need to have the same angle formed by both arms in the first and second postures, so each torsion spring has a high degree of freedom in setting each torsion spring. The operational feeling of the movable body due to the urging of the torsion spring can be adjusted appropriately.
Further, since the second torsion spring is biased so as to cancel the biasing force of the first torsion spring applied in the direction of resistance when the movable body is rotated from the first position to the second position, the movable body is rotated. Can be made easier.
Similarly, in order to overcome the above-mentioned problem and achieve the intended purpose, the support mechanism of the invention according to claim 6 of the present application is:
In a support mechanism provided between the base body and a movable body that is rotatably supported with respect to the base body and rotates between the first posture and the second posture.
A first and second torsion that is rotatably supported on one side of the arm and supported on the side of the movable body and pivots as the movable body rotates. With springs,
Both torsion springs urge the movable body in the first posture in a first biasing direction opposite to the rotation direction toward the second posture, and the movable body in the second posture in the first posture. Urging in the second urging direction opposite to the turning direction toward the urging direction, and the urging direction is switched during the turning of the movable body
The first torsion spring is configured such that an angle formed by both arms in the first posture is larger than an angle formed by both arms in the second posture;
The second torsion spring is configured such that an angle formed by both arms in the first posture is smaller than an angle formed by both arms in the second posture;
The movable body rotates so that the center of gravity is located above the rotation center of the movable body in the first posture and the center of gravity is lowered in the second posture from the position of the center of gravity in the first posture.
The gist is that the urging force obtained by combining all the torsion springs is configured such that the range in the first urging direction is wider than the range in the second urging direction.
According to the sixth aspect of the present invention, since the spring force applied by the second torsion spring in the first posture is greater than that in the second posture, the spring force applied by the first torsion spring in the first posture is greater than that in the second posture. Although it is small, the movable body can be appropriately held in the first posture by the spring force added in the same direction by the first torsion spring and the second torsion spring. Similarly, the second torsion spring makes the spring force applied in the second posture smaller than the first posture, but the first torsion spring makes the spring force applied in the second posture larger than the first posture. The movable body can be appropriately held in the second posture by the spring force added in the same direction by the first torsion spring and the second torsion spring. In addition, each torsion spring does not need to have the same angle formed by both arms in the first and second postures, so each torsion spring has a high degree of freedom in setting each torsion spring. The operational feeling of the movable body due to the urging of the torsion spring can be adjusted appropriately.
Further, when the movable body is turned from the second posture toward the first posture against its own weight, it can be assisted by the urging force of both torsion springs.

  According to the support mechanism according to the present invention, the movable body can be appropriately held in both the first posture and the second posture.

It is a schematic perspective view which shows the switch box provided with the support mechanism based on the preferred Example of this invention, Comprising: (a) has a cover body in a closed position, (b) has a cover body in an open position. It is a front view which shows the switch box of an Example, (a) is a cover body in a closed position, (b) is a cover body in an open position. It is a rear view which shows the switch box of an Example, (a) is a cover body in a closed position, (b) is a cover body in an open position. It is explanatory drawing which shows the support mechanism of the Example which has a cover body in a closed position, Comprising: (a) shows a 1st torsion spring, (b) shows a 2nd torsion spring. It is explanatory drawing which shows the support mechanism of the Example which has a 2nd torsion spring in a 2nd turning point, Comprising: (a) shows a 1st torsion spring, (b) shows a 2nd torsion spring. It is explanatory drawing which shows the support mechanism of the Example which has a 1st torsion spring in a 1st turning point, Comprising: (a) shows a 1st torsion spring and (b) shows a 2nd torsion spring. It is explanatory drawing which shows the support mechanism of the Example which has a cover body in an open position, Comprising: (a) shows a 1st torsion spring and (b) shows a 2nd torsion spring. It is a graph which shows the relationship between the rotation angle of a cover body, and the operation force of a cover body.

  Next, the support mechanism according to the present invention will be described below with reference to the accompanying drawings by way of preferred embodiments.

  The support mechanism of the embodiment is applied to a switch box 10 provided on an armrest disposed on the side of the seat. In addition, the switch box 10 of an Example is for performing operation, such as changing the front-back position and angle of a seat, etc. with the switch which is not shown in figure arrange | positioned inside. As shown in FIG. 1, the switch box 10 includes a base 12 formed in a substantially box shape that opens upward, and a lid (movable body) 22 that can open and close the opening 12 a of the base 12. Yes. As shown in FIGS. 2 and 3, the switch box 10 is provided with support mechanisms 40 and 50 of the embodiment between the base 12 and the lid 22. The switch box 10 has a closed position (first position: FIG. 1A) in which the cover 22 is rotatably supported with respect to the base 12 via the shafts 30 and 35 and covers the opening 12a of the base 12. , FIG. 2 (a), FIG. 3 (a) and FIG. 4) and an open posture retracted from the opening 12a (second posture: FIG. 1 (b), FIG. 2 (b), FIG. 3 (b) and (See FIG. 7). In the switch box 10 of the embodiment, the lid 12 is rotationally displaced around an axis extending in the front-rear direction of the vehicle. In addition, in an Example, the switch box 10 in the state attached to the vehicle is referred to as the left-right direction and the direction around the lid 22 with reference to the case where the switch box 10 is viewed from the front side of the vehicle.

  As shown in FIG. 1, the base 12 is elongated in the front-rear direction in accordance with the armrest extending in the vehicle front-rear direction on the side of the seat, and is held by a frame of an armrest (not shown). The base body 12 has a pair of support walls 16 and 18 erected on the front and rear edges of the arrangement base 14, and the opening 12 a is provided between the both support walls 16 and 18 that are opposed to each other. It has been. Further, the base 12 is formed such that side walls 20, 20 rising at the left and right side edges of the arrangement base 14 are lower than the support walls 16, 18.

  As shown in FIGS. 1 (a) and 2 (a), the lid body 22 is formed in a plate shape that is bent into a substantially “L” shape when viewed from the front, and from the upper side of the base body 12 to the left side in a closed posture. It is designed to cover over. The lid body 22 includes a pair of arms 24 and 26 formed to extend downward from the front and rear end edges of the plate portion extending upward of the base body 12 in the closed posture. The lid 22 is supported such that the extended end portion of the first arm 24 on the front side is rotatable with respect to the first support wall 16 on the front side of the base 12 via the first shaft portion 30, and the second side on the rear side. An extending end portion of the arm 26 is rotatably supported via a second shaft portion 35 with respect to the second support wall 18 on the rear side of the base body 12. Each shaft portion 30, 35 has a peripheral surface that aligns with a circular shaft hole (not shown) formed through the support walls 16, 18 in the front-rear direction, and is radially directed to an edge facing the outside of the base 12. Restricting portions 31 and 36 extending outward are formed (see FIGS. 2 and 3). The shaft portions 30 and 35 are fitted into the shaft holes from the outside of the base body 12, and the extended end portions of the arms 24 and 26 inserted inside the support walls 16 and 18 and the restriction portions 31 and 36. The support walls 16 and 18 are sandwiched between them and fixed to the corresponding arms 24 and 26 by screwing the extended end portions from the outside. As described above, the lid body 22 is supported by the front and rear shaft portions 30 and 35 rotatably held in the shaft hole, and extends from the upper side to the left side of the base body 12 in a closed posture. (See FIG. 1 (a), FIG. 2 (a) and FIG. 3 (a)). The lid 22 extends from the left side to the lower side of the base body 12 in an open position that rotates counterclockwise from the closed position, and retreats from above the base body 12 to open the upper side of the base body 12. It is configured (see FIG. 1 (b), FIG. 2 (b) and FIG. 3 (b)). Thus, the lid body 22 is configured to rotate about the axis K (referred to as a rotation axis) passing through the rotation center of the first shaft portion 30 and the rotation center of the second shaft portion 35.

  The lid body 22 has a center of gravity positioned above the shaft portions 30 and 35 (rotation axis K of the lid body 22) in the closed position, and the center of gravity is lowered in the open position than in the center of gravity position in the closed position. (See FIG. 1). That is, when the cover 22 is rotated from the closed position to the open position, the cover 22 is subjected to its own weight in the direction of the rotation of the cover 22, while the cover 22 is rotated when the cover 22 is rotated from the open position to the closed position. The weight of the lid 22 is applied to the side opposite to the moving operation direction. Note that the switch box 10 of the embodiment is disposed on an armrest disposed on the right side of the right seat, and is rotated and opened so as to separate the lid 22 from the occupant sitting on the right seat, and the lid is placed on the occupant side. The body 22 is rotated and pulled back to close.

  As shown in FIG. 2, a first torsion spring 40 constituting a support mechanism is elastically disposed between the first support wall 16 and the first shaft portion 30 on the front side of the switch box 10. As shown in FIG. 3, a second torsion spring 50 constituting a support mechanism is elastically disposed between the second support wall 18 and the second shaft portion 35 on the rear side of the switch box 10. Yes. In the switch box 10, the lid body 22 is controlled to rotate in both the closed position and the open position by the torsion springs 40 and 50, and the rotation operation of the cover body 22 is assisted in a predetermined rotation angle range. Is done. Each torsion spring 40, 50 has a coil part 42, 52 and two arm parts 44, 46, 54, 56 extending from the coil part 42, 52. The first torsion spring 40 and the second torsion spring 50 may be the same, but in the embodiment, the spring constant and the angle formed by the arms 44, 46, 54, 56 in the natural state are different. Things are used. The natural state of the torsion springs 40 and 50 means an unloaded state in which no torsional stress is applied to the coil portions 42 and 52.

  First, a configuration common to both torsion springs 40 and 50 will be described. As shown in FIGS. 2 and 3, the torsion springs 40 and 50 have base arm portions (one arm portion) 44 and 54 supported by holding portions 17 and 19 provided on the support walls 16 and 18, respectively. The movable arm portions (the other arm portions) 46 and 56 are supported by the shaft portions 30 and 35. The base arm portions 44, 54 are supported so as to be rotatable about the front and rear axes passing through the centers of the holding portions 17, 19 by winding their end portions around the outer peripheral surfaces of the holding portions 17, 19. Each holding portion 17, 19 is formed in a columnar shape protruding from the outer surface of the support walls 16, 18, and a retaining piece that extends radially outward from the outer peripheral surface is formed at the projecting end portion. Thus, the base arm portions 44 and 54 wound around the outer peripheral surface are prevented from coming off. In the first torsion spring 40, the center of rotation relative to the base 12 on the first base arm portion 44 side is referred to as a first base support point (support point) C1a. In the embodiment, the center of the first holding part 17 is the first center. This is the base support point C1a (see FIG. 2). Similarly, in the second torsion spring 50, the rotation center with respect to the base 12 on the second base arm portion 54 side is referred to as a second base support point (support point) C2a, and in the embodiment, the center of the second holding part 19 is the second base support point C2. Two base support points C2a are formed (see FIG. 3). The shaft portions 30 and 35 are formed with extending pieces 32 and 37 extending outward in the radial direction from the restricting portions 31 and 36 facing the outside of the support walls 16 and 18, and the extending pieces 32 and 37 are extended. Through holes 33 and 38 penetrating front and rear are provided at the end portions. The movable arm portions 46 and 56 are supported so as to be rotatable around the front and rear axes passing through the through-holes 33 and 38 by inserting the end portions of the movable arm portions 46 and 56 into the through-holes 33 and 38 and hooking them on the extending pieces 32 and 37. ing. In the first torsion spring 40, the center of rotation with respect to the first shaft portion 30 (lid 22) on the first movable arm portion 46 side is referred to as a first movable support point (support point) C1b. The through-hole 33 is a first movable support point C1b (see FIG. 2). Similarly, in the second torsion spring 50, the rotation center with respect to the second shaft portion 35 (lid body 22) on the second movable arm portion 56 side is called a second movable support point (support point) C2b. Two through holes 38 serve as second movable support points C2b (see FIG. 3).

  As the lid body 22 rotates, the extension pieces 32 and 37 provided on the shaft portions 30 and 35 rotate about the rotation axis K, and the movable arm portions 46 and 56 are pulled accordingly. Reference numerals 40 and 50 rotate about the base support points C1a and C2a. As the lid 22 rotates, the movable support points C1b and C2b are displaced about the rotation axis K, while the base support points C1a and C2a are fixed. The interval between the rotation axis K and the first through hole 33 (first movable fulcrum C1b) is set to be smaller than the interval between the rotation axis K and the first base support point C1a. The first movable fulcrum C1b is configured to pass between the rotation axis K and the first base support point C1a during the rotation between the open postures (see FIGS. 4A to 7A). Similarly, the interval between the rotation axis K and the second through hole 38 (second movable fulcrum C2b) is set smaller than the interval between the rotation axis K and the second base support point C2a, and the lid 22 is closed. The second movable fulcrum C2b is configured to pass between the rotation axis K and the second base support point C2a during the rotation between the normal posture and the open posture (FIGS. 4B to 7B). reference).

  The torsion springs 40, 50 are configured such that the closing angle formed by the arms 44, 46, 54, 56 is smaller than that in the natural state in both the closed posture and the open posture of the lid body 22, and the extension piece 32. , 37 (lid 22), the reaction force (spring force) of the torsional stress applied to the coil portions 42, 52 is applied in the separating direction of the arms 44, 46, 54, 56. The movable support points C1b and C2b approach the virtual straight lines L1 and L2 connecting the rotation axis K and the base support points C1a and C2a by the rotation of the extension pieces 32 and 37 accompanying the rotation of the lid body 22. When displaced in this manner, the angles of the arms 44, 46, 54, and 56 are narrowed so as to close each other around the coil portions 42 and 52, and the spring force increases accordingly. On the other hand, when the movable support points C1b and C2b are moved away from the straight lines L1 and L2 by the rotation of the extension pieces 32 and 37 accompanying the rotation of the lid body 22, both arms 44, 46, 54, and 56 are moved. Is widened so as to open around the coil portions 42 and 52, and the spring force is reduced accordingly. The torsion springs 40, 50 are at the turning points T1, T2 (see FIGS. 5 (b) and 6 (a)) where the movable support points C1b, C2b overlap the straight lines L1, L2, respectively. , 54 and 56 are switched.

  The torsion springs 40, 50 are arranged in a first biasing direction (clockwise in the front view in the embodiment) opposite to the rotation direction of the lid body 22 in the closed position from the closed position to the open position. In addition to energizing, the lid 22 in the open position is urged in a second urging direction (counterclockwise in the front view in the embodiment) opposite to the rotation direction from the open position to the closed position. It is configured as follows. The urging force of each of the torsion springs 40 and 50 is a component force applied in the tangential direction of the virtual circle centered on the rotation axis K of the spring force applied in the separating direction of the arms 44, 46, 54 and 56. Yes, in each of the closed posture and the open posture, the separation direction of the arms 44, 46, 54, 56 and the normal direction of the virtual circle centering on the rotation axes K, K are set to intersect. Yes. With the rotation of the extension pieces 32 and 37 and the torsion springs 40 and 50 accompanying the rotation of the lid 22, the direction of the spring force (the separating direction of both arms 44, 46, 54 and 56) and the rotation axis K are changed. At the neutral points N1, N2 aligned with the normal direction of the virtual circle as the center, the direction of the urging force by the torsion springs 40, 50 is switched (see FIG. 8). The support mechanism of the embodiment is configured such that the turning points T1, T2 and the neutral points N1, N2 are shifted between the torsion springs 40, 50. The torsion springs 40 and 50 are set to be neutral points N1 and N2 at a rotation angle closer to the closed posture than the rotation angle of the lid 22 at the turning points T1 and T2 (see FIG. 8). . In FIG. 8, the combined urging force (solid line) obtained by combining the urging force of the first torsion spring 40 (see the alternate long and short dash line), the urging force of the second torsion spring 50 (see the alternate long and two short dashes line), and the urging force of both the torsion springs 40 and 50. For each of the reference, the operation force necessary for rotating the lid 22 is shown.

  Next, the first torsion spring 40 and the configuration related to the first torsion spring 40 will be specifically described. As shown in FIG. 2, the first holding portion 17 that supports the first base arm portion 44 of the first torsion spring 40 is provided apart from the first shaft portion 30 (the rotation axis K of the lid body 22). In the embodiment, it is arranged on the lower right side of the rotation axis K. The first extending piece 32 of the first shaft portion 30 extends obliquely to the lower right side of the rotation axis K in the closed posture of the lid body 22, and the first torsion spring 40 in the closed posture is in the first position. The one movable support point C1b is positioned below a virtual first straight line (first straight line) L1 that connects the rotation axis K and the first base support point C1a by projecting them onto a plane (FIG. 2). (See (a) and FIG. 4 (a)). Then, the first torsion spring 40 in the closed posture is opposite to the rotation direction of the first extension piece 32 to the open posture by a spring force that acts to push the first extension piece 32 diagonally to the lower left. It is biased in the direction (clockwise). Further, the first extension piece 32 of the first shaft portion 30 extends obliquely to the upper right side of the rotation axis K in the opened posture of the lid body 22, and the first torsion spring 40 in the opened posture is first. The movable support point C1b is located above the first straight line L1 (see FIGS. 2B and 7A). The first torsion spring 40 in the open posture is opposite to the rotation direction of the first extended piece 32 to the closed posture by a spring force that acts to push the first extended piece 32 obliquely upward to the left. It is biased in the direction (counterclockwise). The first torsion spring 40 has a first closing angle (angle) R1a (see FIGS. 2 (a) and 4 (a)) formed by both arms 44, 46 in the closed position, and both arms in the open position. The first opening angle (angle) R1b (see FIGS. 2B and 7A) formed by the portions 44 and 46 is configured to be larger. That is, the distance between the first base support point C1a and the first movable support point C1b in the closed position is set larger than the distance between the first base support point C1a and the first movable support point C1b in the open position. The Thus, the first torsion spring 40 applies a larger spring force in the open posture than in the closed posture.

  In the first torsion spring 40, when the lid body 22 is rotated from the closed position to the open position, the first extending piece 32 is rotated counterclockwise, and the first movable support point C1b is the first. Approaching the base support point C1a, the angle formed by both arms 44, 46 gradually decreases. The first torsion spring 40 is a first turning point T1 where the first movable support point C1b overlaps the first straight line L1, and the distance between the first movable support point C1b and the first base support point C1a is minimized. (See FIG. 6 (a)). Then, when the first extending piece 32 rotates counterclockwise beyond the first turning point T1, the angle formed by both arm portions 44 and 46 gradually increases. When the first torsion spring 40 rotates the cover 22 from the open position to the closed position, the first extending piece 32 rotates clockwise, and the first movable support point C1b supports the first base body. Approaching the point C1a, the angle formed by both arm portions 44, 46 gradually decreases. Further, when the first extending piece 32 rotates clockwise beyond the first turning point T1, the angle formed by the arms 44 and 46 of the first torsion spring 40 gradually increases. As described above, the first torsion spring 40 is configured such that the first movable support point C1b is reciprocally displaced across the first straight line L1 as the lid body 22 rotates, and both arms at the first turning point T1. The opening and closing directions of the portions 44 and 46 are switched. As shown in FIG. 8, the urging force by the first torsion spring 40 varies abruptly before and after sandwiching the first turning point T1, and the urging force gradually changes in other ranges. Here, the direction in which the first torsion spring 40 urges the first extending piece 32 is a first neutral point N1 where the first movable support point C1b is located between the closed posture and the first turning point T1. It is set to switch (see FIG. 8). The first torsion spring 40 of the embodiment rotates the first extension piece 32 clockwise (first biasing direction) in a state where the first movable support point C1b is between the closed posture and the first neutral point N1. ) And the first extending piece 32 is urged counterclockwise (second urging direction) in a state where the first movable support point C1b is between the first neutral point N1 and the open posture. It is configured as follows.

  The first torsion spring 40 is set such that the first movable support point C1b reaches the first turning point T1 at the rotation angle of the lid body 22 that is closer to the open position than the closed position (see FIG. 8). Further, the first torsion spring 40 is set so that the first movable support point C1b reaches the first neutral point N1 at the rotation angle of the lid body 22 that is closer to the open posture than the closed posture. That is, the first torsion spring 40 has a second urging range in which the first extending piece 32 is urged in the first urging direction when the lid body 22 is rotated between the closed posture and the open posture. It is set to be larger than the range in which the first extending piece 32 is urged in the direction. Although the urging force of the first torsion spring 40 changes rapidly before and after the first turning point T1, the direction of the urging force (second urging direction) does not change.

  Next, the second torsion spring 50 and the configuration related to the second torsion spring 50 will be specifically described. As shown in FIG. 3, the second holding portion 19 that supports the second base arm portion 54 of the second torsion spring 50 is provided apart from the second shaft portion 35 (the rotation axis K of the lid body 22). In the embodiment, it is arranged on the lower left side of the rotation axis K. The second extending piece 37 of the second shaft portion 35 extends obliquely to the upper left side of the rotation axis K in the closed posture of the lid body 22, and the second extension of the second torsion spring 50 in the closed posture. The movable support point C2b is positioned above a virtual second straight line (second straight line) L2 that connects the rotation axis K and the second base support point C2a by projecting them onto a plane (FIG. 3 ( a) and FIG. 4 (b)). The second torsion spring 50 in the closed position is opposite to the rotation direction of the second extension piece 37 to the open position by a spring force that acts to push the second extension piece 37 obliquely to the upper right. It is biased in the direction (clockwise). In addition, the second extending piece 37 of the second shaft portion 35 extends obliquely to the lower left side of the rotation axis K in the opened posture of the lid body 22, and the second extension of the second torsion spring 50 in the opened posture. The movable support point C2b is located below the second straight line L2 (see FIGS. 3B and 7B). Then, the second torsion spring 50 in the open posture is rotated in a direction in which the second extension piece 37 is turned to the closed posture by a spring force that acts to push the second extension piece 37 obliquely downward to the lower right. Energized in the opposite direction (counterclockwise). Further, the second torsion spring 50 has a second closing angle (angle) R2a (see FIGS. 3A and 4B) formed by the arms 54 and 56 in the closed position, and both arms in the open position. It is configured to be smaller than a second opening angle (angle) R2b (see FIGS. 3B and 7B) formed by the portions 54 and 56. That is, the distance between the second base support point C2a and the second movable support point C2b in the closed position is set smaller than the distance between the second base support point C2a and the second movable support point C2b in the open position. The Thus, the second torsion spring 50 applies a larger spring force in the closed position than in the open position.

  In the second torsion spring 50, when the lid body 22 is rotated from the closed position to the open position, the second extending piece 37 is rotated counterclockwise, and the second movable support point C2b is the second position. Approaching the base support point C2a, the angle formed by both arms 54 and 56 gradually decreases. Further, the second torsion spring 50 has a minimum distance between the second movable support point C2b and the second base support point C2a at the second turning point T2 where the second movable support point C2b overlaps the second straight line L2. (Refer FIG.5 (b)). Then, when the second extending piece 37 rotates counterclockwise beyond the second turning point T2, the angle formed by both arm portions 54 and 56 gradually increases. In the second torsion spring 50, when the lid body 22 is rotated from the open position to the closed position, the second extending piece 37 is rotated clockwise, and the second movable support point C2b is supported by the second base body. As the point C2a is approached, the angle formed by the arms 54 and 56 gradually decreases. Further, when the second extension piece 37 rotates clockwise beyond the second turning point T2, the angle formed by the arms 54 and 56 of the second torsion spring 50 gradually increases. As described above, the second torsion spring 50 is configured such that the second movable support point C2b is reciprocally displaced across the second straight line L2 as the lid body 22 rotates, and both arms at the second turning point T2. The opening and closing directions of the parts 54 and 56 are switched. As shown in FIG. 8, the urging force by the second torsion spring 50 varies abruptly before and after the second turning point T2, and the urging force gradually changes in other ranges. Here, the direction in which the second torsion spring 50 urges the second extending piece 37 is a second neutral point N2 where the second movable support point C2b is located between the closed posture and the second turning point T2. It is set to switch (see FIG. 8). The second torsion spring 50 according to the embodiment rotates the second extension piece 37 clockwise (first biasing direction) in a state where the second movable support point C2b is between the closed posture and the second neutral point N2. ) And the second extending piece 37 is urged counterclockwise (second urging direction) in a state where the second movable support point C2b is between the second neutral point N2 and the open posture. It is configured as follows.

  The second torsion spring 50 is set so that the second movable support point C2b reaches the second turning point T2 at the rotation angle of the lid body 22 that is closer to the closed position than the open position (see FIG. 8). Further, the second torsion spring 50 is set so that the second movable support point C2b reaches the second neutral point N1 at the rotation angle of the lid body 22 that is closer to the closed posture than the open posture. In other words, the second torsion spring 50 has a first biasing range in which the second extending piece 37 is biased in the second biasing direction when the lid body 22 is rotated between the closed posture and the open posture. It is set to be larger than the range in which the second extending piece 37 is urged in the direction. Although the urging force of the second torsion spring 50 fluctuates abruptly around the second turning point T2, the direction of the urging force (second urging direction) does not change.

  As shown in FIG. 2 or FIG. 3, the support mechanism is such that the first base support point C1a and the second base support point C2a are located below the rotation axis K and are opposite to each other with the rotation axis K in between. Arranged on the side. Further, in the closed posture, the first movable support point C1b is located obliquely lower right of the rotation axis K, while the second movable support point C2b is located obliquely upper left of the rotation axis K. . In the open posture, the first movable support point C1b is positioned on the diagonally upper right side of the rotation axis K, while the second movable support point C2b is positioned on the diagonally lower left side of the rotation axis K. As the lid body 22 rotates, the first movable support point C1b reciprocates in the oblique lower right side and oblique upper right side of the rotational axis K, and the second movable support point C2b moves to the rotational axis. The range of the diagonally upper left side and the diagonally lower left side of K is reciprocally displaced. As described above, the first movable support point C1b and the second movable support point C2b are arranged with a required angle shifted around the rotation axis K, and the corresponding extension pieces 32, 37 are respectively provided by the torsion springs 40, 50. In contrast, the spring force is applied from different directions.

  The support mechanism applies a combined urging force, which is a combination of the urging force of the first torsion spring 40 and the urging force of the second torsion spring 50 configured as described above, to the lid body 22. The support mechanism urges the cover body 22 in the closed posture in the first urging direction by all the torsion springs 40 and 50, and adds the urging forces of all the torsion springs 40 and 50 together. A force is applied to the lid body 22 in the first biasing direction. Further, the support mechanism urges the cover body 22 in the open posture in the second urging direction by all the torsion springs 40, 50, and adds the urging forces of all the torsion springs 40, 50 together. An urging force is applied to the lid body 22 in the second urging direction. Here, in the support mechanism, the first closing angle R1a of the first torsion spring 40 is larger than the first opening angle R1b, whereas the second closing angle R2a of the second torsion spring 50 is the second opening angle. It is set smaller than R2b. That is, the magnitude relationship between the spring force acting in the closed posture and the spring force (biasing force) acting in the open posture is set to be opposite between the first torsion spring 40 and the second torsion spring 50.

  In the support mechanism, the second torsion spring 50 applies a spring force applied in the closed position to be larger than the open position. Therefore, the first torsion spring 40 applies a spring force in the closed position smaller than the open position. The lid 22 can be appropriately held in the closed posture by the spring force added in the same direction by the torsion spring 40 and the second torsion spring 50 (see FIG. 8). Similarly, the spring force applied by the second torsion spring 50 in the open position is smaller than that in the closed position, but the spring force applied by the first torsion spring 40 in the open position is greater than that in the closed position. The lid 22 can be appropriately held in the open posture by the spring force (see FIG. 8) added in the same direction by the first torsion spring 40 and the second torsion spring 50. Thus, according to the support mechanism, the combined urging force of the two torsion springs 40 and 50 is applied to the lid body 22 in the closed posture and the open posture, so that a lock mechanism for fixing the lid body 22 is not provided. The backlash of the lid 22 can be prevented even when the vehicle vibrates. Further, since it is not necessary for the torsion springs 40, 50 to have the same angle between the arms 44, 46, 54, 56 between the closed position and the open position, the torsion springs 40, 50 are set individually. Therefore, when the lid body 22 is rotated between the closed posture and the open posture, the operational feeling of the lid body 22 by the urging of the torsion springs 40 and 50 can be adjusted appropriately.

  In the support mechanism, the first torsion spring 40 becomes the first turning point T1 on the opening posture side with respect to the closed posture, whereas the second torsion spring 50 has the second turning point on the closing posture side with respect to the opening posture. T2 (see FIG. 8). That is, the support mechanism determines the rotation angle of the lid body 22 where the first torsion spring 40 becomes the first turning point T1, and the turning angle of the lid body 22 where the second torsion spring 50 becomes the second turning point T2. It is configured to stagger. Further, the support mechanism has a rotation angle of the lid body 22 where the first torsion spring 40 becomes the first neutral point N1 and a rotation angle of the lid body 22 where the second torsion spring 50 becomes the second neutral point N2. It's off. As described above, at the turning points T1 and T2, the spring force of the torsion springs 40 and 50 is maximized and the urging force is greatly changed by switching between the opening and closing directions of the arms 44, 46, 54 and 56. In the support mechanism, the timing at which the first turning point T1 becomes the same as the timing at which the second turning point T2 when the lid body 22 is turned is set so as not to be the same, so that the operation load at each turning point T1, T2 Can be suppressed. That is, the operation load of the cover body 22 is significantly increased by the combined biasing force applied in the direction opposite to the rotation operation direction of the cover body 22, or the cover body 22 is generated by the combined biasing force applied in the same direction as the rotation operation direction of the cover body 22. The adverse effects caused by the overlap of the first turning point T1 and the second turning point T2, such as a sudden automatic displacement of the above, can be avoided.

  The support mechanism is configured such that the second torsion spring 50 is biased in the second biasing direction at the first turning point T1 of the first torsion spring 40, and the first torsion spring is at the second turning point T2 of the second torsion spring 50. 40 is configured to bias in the first biasing direction (see FIG. 5 or FIG. 6). Further, the support mechanism is configured so that at least one of the turning points T1 and T2 of the torsion springs 40 and 50 has a biasing direction of the other torsion spring 40 among the biasing forces of the one torsion spring 50 that fluctuates before and after the turning point. The biasing force acting in the opposite direction is configured to be smaller than the biasing force of the other torsion spring 40. The support mechanism of the embodiment includes a second biasing direction by the second torsion spring 50 that fluctuates around the second turning point T2 at the rotation angle of the lid 22 where the second torsion spring 50 becomes the second turning point T2. The urging force of the first torsion spring 40 is configured to be smaller than the urging force in the first urging direction. In other words, the support mechanism of the embodiment applies a combined biasing force to the lid body 22 in the first biasing direction at the rotation angle of the lid body 22 at which the second torsion spring 50 becomes the second turning point T2. It has become. Further, the support mechanism is configured such that the biasing force by the first torsion spring 40 that fluctuates around the first turning point T1 at the rotation angle of the lid 22 where the first torsion spring 40 becomes the first turning point T1 is the second torsion. The second biasing direction is the same as that of the spring 50. That is, the support mechanism according to the embodiment applies a combined biasing force in the second biasing direction to the lid body 22 at the rotation angle of the lid body 22 at which the first torsion spring 40 becomes the first turning point T1. It has become. The support mechanism is configured such that the composite neutral point N3 where the urging force by the first torsion spring 40 and the urging force by the second torsion spring 50 balance is one (see FIG. 8).

  As described above, the support mechanism is configured so that the combined neutral point N3 of the combined urging force of the torsion springs 40 and 50 is one, thereby rotating the lid body 22 between the closed position and the open position. When moving, the angular position (combining neutral point N3) at which the lid body 22 stops can be minimized. Further, if the direction of the combined urging force by both the torsion springs 40 and 50 is frequently switched, it is difficult to rotate the lid body 22 because the operation load is repeatedly increased or decreased. According to this, since the direction of the combined urging force is switched only once, the lid body 22 can be smoothly rotated and the operational feeling of the lid body 22 can be improved.

  The support mechanism has a biasing force peak in the second biasing direction by the second torsion spring 50 rather than a peak of the biasing force in the first biasing direction by the first torsion spring 40 (in the embodiment, the second turning point T2). ) Is set to be small. Further, the support mechanism has a peak of the biasing force in the second biasing direction by the first torsion spring 40 (the first turning point in the embodiment) rather than the peak of the biasing force in the first biasing direction by the second torsion spring 50. T1) is set to be large.

  In the support mechanism, the first torsion spring 40 becomes the first neutral point N1 on the open posture side with respect to the closed posture, while the second torsion spring 50 moves to the second neutral point N2 on the closed posture side with respect to the open posture. Configured to be. In other words, the support mechanism moves the first torsion spring 40 in the range of the rotation angle corresponding to the first neutral point N1 and the rotation angle corresponding to the second neutral point N2 (referred to as a canceling range) when the lid body 22 rotates. The urging directions of the second torsion spring 50 are opposite to each other (see FIG. 8). The support mechanism applies a combined urging force obtained by subtracting the urging forces of the first torsion spring 40 and the second torsion spring 50 to the side having the larger urging force in the offset range. The composite neutral point N3 is located in the offset range. In addition, the support mechanism includes a first torsion spring 40 and a second torsion spring 50 in a total range other than the offset range (between the closed posture and the second neutral point N2 and between the first neutral point N1 and the open posture). The energizing direction is the same.

  Here, the support mechanism is set so that the peak of the biasing force in the first biasing direction by the first torsion spring 40 is positioned in the offset range, and is weaker than the biasing force of the first torsion spring 40 at the peak. An urging force is applied by the second torsion spring 50 in the second urging direction. Accordingly, the combined biasing force obtained by combining the biasing forces of the first torsion spring 40 and the second torsion spring 50 is a value obtained by subtracting the biasing force of the second torsion spring 50 from the biasing force of the first torsion spring 40. The operation load can be reduced when the lid 22 is rotated from the closed position to the open position. Thus, since the support mechanism combines the two torsion springs 40, 50, the biasing force of both the torsion springs 40, 50 are added together, and the lid 22 can be rotated more reliably in the closed posture and the open posture. It is possible to reduce the operation load during rotation by regulating the force or canceling the urging forces of the torsion springs 40 and 50. That is, according to the support mechanism, it is possible to achieve both proper holding of the lid 22 in both the closed posture and the open posture and easy rotation of the lid 22, which is impossible with a single torsion spring. You can make adjustments with a high degree of freedom.

  The support mechanism is set so that the combined neutral point N3 of the combined urging force by the torsion springs 40 and 50 is positioned on the open position side of the closed position, and the cover body 22 is applied with the combined urging force in the second urging direction. The angle range in which the combined urging force is applied in the first urging direction is wider than the angle range. As described above, the switch box 10 is configured such that the center of gravity of the cover body 22 is lowered as the switch box 10 is rotated from the closed position to the open position, and the weight of the cover body 22 is reduced when the switch box 10 is rotated from the open position to the closed position. It is opposite to the direction of rotation operation. Here, since the support mechanism narrows the range to be urged in the second urging direction and widens the range to be urged in the first urging direction, the lid 22 is moved from the open position to the closed position. When the is rotated, the urging direction is switched at an early stage, and the rotation operation of the lid body 22 is assisted by the combined urging force applied in the first urging direction. Therefore, the lid 22 can be smoothly rotated from the open posture to the closed posture.

  As shown in FIGS. 2 and 3, each support wall 16, 18 is provided with restriction holes 16 a, 18 a extending in an arc shape with the rotation axis K as the center, and inside the support walls 16, 18. Positioning pieces 25 and 27 which are formed so as to protrude from the outer surfaces of the corresponding arms 24 and 26 are inserted into the restriction holes 16a and 18a. The first positioning piece 25 on the front side regulates the clockwise rotation of the lid body 22 in the closed posture, with the lower end abutting against the lower edge of the first regulating hole 16a and exceeding the closed posture of the lid body 22. (See FIG. 2 (a)), the upper end of the lid 22 is in contact with the upper edge of the first restricting hole 16a when the lid 22 is in the open posture, and the counterclockwise rotation beyond the open posture of the lid 22 is restricted. (FIG. 2B). The second positioning piece 27 on the rear side restricts the clockwise rotation of the lid body 22 in the closed position when the upper end abuts on the upper edge of the second regulating hole 18a and the lid body 22 exceeds the closed position. However, the lower end of the lid 22 is in contact with the lower edge of the second restricting hole 18a in the opening posture of the lid body 22 and the counterclockwise rotation beyond the opening posture of the lid body 22 is restricted. (See FIG. 3B). As shown in FIGS. 1 and 2, a gear portion 34 having a plurality of concavities and convexities is formed on the outer peripheral edge of the first restricting portion 31 in the first shaft portion 30, and the gear portion 34 is formed on the first shaft. The rotary gear 60 of the rotary damper 60 disposed adjacent to the left side of the portion 30 is engaged with the rotary gear. The first shaft portion 30 is braked against a sudden rotational displacement by the rotary damper 60.

(Change example)
The present invention is not limited to the configuration of the embodiment described above, and can be modified as follows.
(1) Although the example which applied the support mechanism to the switch box was demonstrated in the Example, the support mechanism which concerns on this invention is applicable to the lid of a console box, a glove box, an ashtray, and other accessory cases. Moreover, a rotary cup holder, an armrest, etc. may be sufficient.
(2) The “base side” to which one arm portion of the torsion spring is connected is not only to the base body itself but also to a base member such as a member disposed on the base body or a peripheral member separate from the base body. Members whose relative positional relationship does not change. The “movable body side” to which the other arm of the torsion spring is connected is not only the movable body itself, but also linked to the rotational displacement of the movable body, such as gears and link bars that are displaced as the movable body is rotationally displaced. The member to be included.
(3) The support mechanism is not limited to the configuration including one set of the first torsion spring and the second torsion spring, and a plurality of sets of the first torsion spring and the second torsion spring may be provided. The first torsion spring and the second torsion spring forming a pair are not limited to a one-to-one relationship, and may be a one-to-multiple (multiple-to-one) relationship or a multiple-to-multiple relationship.
(4) The arrangement of the torsion spring is not limited to the configuration of the embodiment, and the first and second torsion springs are arranged corresponding to the front and back of one arm, or the torsion is arranged corresponding to each of three or more arms. A spring may be arranged.
(5) For the turning point, neutral point, and biasing force of each torsion spring, various settings such as the rotation axis, base support point, movable support point, arm length, and angle of both arms are set as appropriate. You can adjust it. That is, the neutral point and the turning point in the torsion spring may be aligned.
(6) At the turning point of one of the torsion springs, the direction of the combined biasing force is one biased before and after the one turning point without switching the direction of the combined biasing force to the first biasing direction or the second biasing direction. Configured to keep in direction. On the other hand, at the turning point of another torsion spring, the direction of the combined urging force is changed before and after the other turning point without switching the direction of the combined urging force to the first urging direction or the second urging direction. The biasing direction may be maintained (Example), or the direction of the combined biasing force may be switched between the first biasing direction and the second biasing direction before and after another turning point.

12 base body, 22 lid body (movable body), 40 first torsion spring,
44 1st base arm part (one arm part), 46 1st movable arm part (the other arm part),
50 Second torsion spring, 54 Second base arm (one arm),
56 second movable arm (the other arm), K rotation axis (rotation center),
C1a first base support point (support center), C1b first movable support point (support center),
C2a second base support point (support center), C2b second movable support point (support center),
T1 1st turning point (turning point), T2 2nd turning point (turning point)

Claims (6)

In a support mechanism provided between the base body and a movable body that is rotatably supported with respect to the base body and rotates between the first posture and the second posture.
A first and second torsion that is rotatably supported on one side of the arm and supported on the side of the movable body and pivots as the movable body rotates. With springs,
Both torsion springs urge the movable body in the first posture in a first biasing direction opposite to the rotation direction toward the second posture, and the movable body in the second posture in the first posture. Urging in the second urging direction opposite to the turning direction toward the urging direction, and the urging direction is switched during the turning of the movable body
The first torsion spring is configured such that an angle formed by both arms in the first posture is larger than an angle formed by both arms in the second posture;
The second torsion spring is configured such that an angle formed by both arms in the first posture is smaller than an angle formed by both arms in the second posture ;
Along with the rotation of the movable body, the first torsion spring straddles the first straight line connecting the rotation center of the movable body and the support point of one arm part, and the support point of the other arm part. And the second torsion spring is configured such that the support point of the other arm portion is displaced across the second straight line connecting the rotation center of the movable body and the support point of the one arm portion. And
The rotation angle of the movable body at the first turning point where the support point of the other arm portion in the first torsion spring overlaps the first straight line, and the support point of the other arm portion in the second torsion spring are The support mechanism, wherein the support body is configured to deviate from a rotation angle of the movable body at a second turning point that overlaps the second straight line . The other torsion spring is biased in one biasing direction at the turning point of one torsion spring, and one torsion spring is biased in the other biasing direction at the turning point of the other torsion spring,
At least one turning point of both torsion springs, the biasing force acting opposite to the biasing direction of the other torsion spring among the biasing forces of one torsion spring that fluctuates around the turning point is applied to the other torsion spring. The support mechanism according to claim 1 , wherein the support mechanism is configured to be smaller than a force. The urging force that is weaker than the urging force at the peak is applied to the second urging direction by the second torsion spring at the peak of the urging force in the first urging direction by the first torsion spring. 3. The support mechanism according to 1 or 2 . The movable body rotates so that the center of gravity is located above the rotation center of the movable body in the first posture and the center of gravity is lowered in the second posture from the position of the center of gravity in the first posture.
All the urging force obtained by combining the torsion spring, according to any one of claim 1 to 3, which is configured according range is widened to the first biasing direction than the range according to the second biasing direction Support mechanism. In a support mechanism provided between the base body and a movable body that is rotatably supported with respect to the base body and rotates between the first posture and the second posture.
A first and second torsion that is rotatably supported on one side of the arm and supported on the side of the movable body and pivots as the movable body rotates. With springs,
Both torsion springs urge the movable body in the first posture in a first biasing direction opposite to the rotation direction toward the second posture, and the movable body in the second posture in the first posture. Urging in the second urging direction opposite to the turning direction toward the urging direction, and the urging direction is switched during the turning of the movable body
The first torsion spring is configured such that an angle formed by both arms in the first posture is larger than an angle formed by both arms in the second posture;
The second torsion spring is configured such that an angle formed by both arms in the first posture is smaller than an angle formed by both arms in the second posture;
At the peak of the biasing force in the first biasing direction by the first torsion spring, the biasing force weaker than the peak biasing force is applied in the second biasing direction by the second torsion spring.
A support mechanism characterized by that . In a support mechanism provided between the base body and a movable body that is rotatably supported with respect to the base body and rotates between the first posture and the second posture.
A first and second torsion that is rotatably supported on one side of the arm and supported on the side of the movable body and pivots as the movable body rotates. With springs,
Both torsion springs urge the movable body in the first posture in a first biasing direction opposite to the rotation direction toward the second posture, and the movable body in the second posture in the first posture. Urging in the second urging direction opposite to the turning direction toward the urging direction, and the urging direction is switched during the turning of the movable body,
The first torsion spring is configured such that an angle formed by both arms in the first posture is larger than an angle formed by both arms in the second posture;
  The second torsion spring is configured such that an angle formed by both arms in the first posture is smaller than an angle formed by both arms in the second posture;
The movable body rotates so that the center of gravity is located above the rotation center of the movable body in the first posture and the center of gravity is lowered in the second posture from the position of the center of gravity in the first posture.
The urging force obtained by synthesizing all the torsion springs is configured such that the range applied in the first urging direction is wider than the range applied in the second urging direction.
A support mechanism characterized by that.

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