JP2002089122A - Opening and shutting mechanism of cover body - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an opening and shutting mechanism of a cover body capable of realizing an excellent operation feeling in the case the cover body is opened and shut. SOLUTION: In an opening state of the cover body 24, first and second supporting points P1 and P2 are so arranged that a straight line L1 connecting the first supporting point P1 connecting a slider 32 to a connecting arm 64 to the second supporting point P2 connecting the upper end of the cover body 24 to the connecting arm 64 is crossed with a moving line L2 of the slider 32. Then, the second supporting point P2 is placed upward from the moving line L2 of the slider 32 at a predetermined distance. An angle θ made with the straight line L1 connecting the first supporting point P1 to the second supporting point P2 and a straight line L3 connecting the rotational center P3 of the cover body 24 to the second supporting point P2 is set within a range of 115 deg. to 125 deg..

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an opening / closing mechanism for a cover such as an audio equipment and a small case mounted on a center console or the like of a vehicle.

[0002]

2. Description of the Related Art A lid of this type is known, for example, as shown in FIG. That is, the frame 102 includes a frame 102 as a base member fixed in the opening of the center console 101 of the vehicle, and a lid 103 that covers the front surface of the frame 102 so as to be openable and closable. An opening 104 is formed on the front surface of the frame 102.
The audio device 105 and the like are accommodated in the device 04.

On the upper surface of the frame 102, a frame 102
A pair of rails 106 extending in the front-rear direction are provided. A slider 107 is provided as a movable body that engages with the rail 106 and is slidable in the front-rear direction of the frame 102 along the rail 106. One end of a connection arm 108 is rotatably connected to rear portions of both sides of the slider 107.

[0004] The lid 103 is rotatably connected about a substantially center of a side surface of the frame 102 via a rotation arm 109 fixed to the back surface thereof with screws. The connecting arm 1 is provided at the upper end of the lid 103.
08 is rotatably connected to the other end. Lid 1
In the vicinity of the lower end of the surface of 03, a finger hook ridge 110 protruding in the longitudinal direction of the lid 103 protrudes.

A spiral spring (not shown) that constantly biases the slider 107 from the front to the rear of the frame 102 is accommodated in the slider 107. further,
In the slider 107, the lid 103 is attached to the frame 1
A stopper (not shown) that holds the front cover 02 in a closed position covering the front surface of the front cover 02 is housed.

Here, in order to improve the operability, in order to mount the audio device 105 in an inclined state in which the front surface is slightly upward, the upper surface of the frame 102 is inclined downward from the front to the rear. Is fixed in the center console 101 in an inclined state so as to have

In such a conventional configuration, the slider 1
When the stopper in 07 is released, the slider 107 is moved from the front position to the rear position on the upper surface of the frame 102 by the urging action of the spiral spring. The upper end of the lid 103 is connected to the slider 107 via a connecting arm 108. For this reason, the lid 103 is pivoted about the base end of the pivot arm 109 on the side surface of the frame 102 while being lifted from the closed position in front of the frame 102 in conjunction with the movement of the slider 107. Is done. When the slider 107 reaches the predetermined rear position, the lid 103 is housed in the opening of the center console 101 so that most of the lid 103 almost overlaps the upper surface of the frame 102, and is disposed at the open position. Is done. In this state,
The front surface of the audio device 105 is exposed, and a cassette tape and a compact
A disk or the like can be inserted and removed.

[0008]

By the way, in the above-mentioned conventional structure, the spiral spring is wound most when the slider 107 is at the front position, so that the rearward biasing force on the slider 107 is maximized. Is set. As the slider 107 moves rearward, the spiral spring is relaxed and the urging force on the slider 107 rearward decreases. When the slider 107 reaches the rear position, which is the end point of the movement, the urging force is set to be almost zero.

Thus, at the initial stage of the movement of the slider 107, the heavy lid 103 can be pulled up while securing a predetermined moving speed of the slider 107. As the slider 107 moves rearward, the lid 103 moves to the frame 1
02 is rotated from the front surface to the upper surface side of the cover 103.
The force in the direction of decreasing the moving speed of the slider 107 based on the weight of the slider 107 decreases.

Here, when the frame 102 is fixed in an inclined state and the slider 107 reaches a rear position, which is the end point of the movement, the connecting arm 108 is set so as to be substantially parallel to the movement line of the slider 107. Are located. Therefore, when the slider 107 approaches the rear position,
A force for increasing the moving speed of the slider 107 starts to be generated based on the inertial weight of the lid 103. As a result, as shown by the broken line in FIG. 10, the moving speed of the lid 103 sometimes jumps near the open position.

Further, a finger hook 110 is provided in the vicinity of the lower end of the lid 103, but because of its extremely simple shape, it is easy to slip. In particular,
When an obstacle such as a shift knob is present on the front surface of the lid 103, it is difficult to reliably open and close the lid 103. In addition, the finger hook ridge 110 is poorly distinguishable as an operation unit for moving the cover 103 to the open position. As described above, the conventional lid opening / closing mechanism has a problem that a good operation feeling of the lid 103 cannot be obtained.

The present invention has been made by paying attention to such problems existing in the prior art. It is an object of the present invention to provide a lid opening and closing mechanism capable of realizing an excellent operation feeling when the lid is opened and closed.

[0013]

According to a first aspect of the present invention, there is provided a base member, a closed position in front of the base member, and an open position above the base member. Position and a lid that can be switched and arranged in a position, a holding mechanism that holds the lid in the closed position, and a front position set in front of an upper surface of the base member and a rear surface on the upper surface of the base member from the front position. A moving body that moves between a rear position set with a predetermined head, a connecting body that connects the moving body and an upper end of the lid in a closed state, and the moving body attached to the rear position side. When the holding of the lid in the holding mechanism is released, the moving body is moved from the front position to the rear position by the urging force of the urging mechanism,
In the lid opening / closing mechanism in which the lid is rotated from the closed position to the open position in conjunction with the movement of the moving body, in the state where the lid is disposed in the open position, the connection is performed. A straight line connecting a first fulcrum connecting the body and the moving body and a second fulcrum connecting the connecting body and the upper end of the lid intersects the moving line of the moving body. It is characterized by doing so.

According to a second aspect of the present invention, in the first aspect of the present invention, the second fulcrum is defined as a movement line of the movable body in a state where the lid is disposed at an open position. , And is disposed above at a predetermined distance from.

According to a third aspect of the present invention, in the first or second aspect of the present invention, the first fulcrum and the second fulcrum are connected to each other when the lid is disposed at an open position. The angle between the straight line connecting the fulcrum and the straight line connecting the rotation center of the lid disposed on the side surface of the base member and the second fulcrum is within the range of 115 ° to 125 °. It is characterized by being.

According to these inventions, even when the moving body approaches the rear position which is the end point of the movement, the generation of a force for increasing the moving speed of the moving body based on the inertial weight of the lid is suppressed, and the lid is suppressed. Bouncing of the movement speed of the body near the open position is suppressed.

According to a fourth aspect of the present invention, there is provided the invention according to any one of the first to third aspects, wherein the surface of the lid is provided near the lower end thereof. Along with providing a plurality of ridges extending along the longitudinal direction of the
A recess is provided on the upper side of the plurality of ridges along the ridges.

According to the invention of claim 4 of the present application, in addition to the function of the invention of any one of claims 1 to 3, a plurality of ridges are provided and the ridges are provided. A recess is provided along the line. For this reason,
In order to open the lid, it is possible to easily put a finger on this ridge and to make it less slippery. In addition, since the presence of the ridge is emphasized by the concave portion, the ridge can be distinguished as an operation unit for opening the lid.

[0019]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment in which the present invention is embodied in a so-called "push-open" type cover of an audio device housed in a center console of a vehicle will be described with reference to FIGS. explain.

As shown in FIG. 1 and FIG.
Comprises a frame 23 as a base member fixed in the opening of the center console 22 of the vehicle, and a lid 24 that opens and closes the front surface of the frame 23. This frame 2
An opening 25 is formed in the front surface of 3 (see FIGS. 4 and 5), and an audio device 26 and the like are accommodated in the opening 25.

As shown in FIGS. 3 to 5, a pair of rails 31 extending in the front-rear direction of the frame 23 protrude from the upper surface of the frame 23 near both side ends thereof. A slider 32 as a moving body is slidably engaged with the rail 31 in the front-rear direction of the frame 23 along the rail 31. Between the frame 23 and the slider 32, a biasing mechanism 33 for constantly biasing the slider 32 to the rear position side of the frame 23, and the slider 32 can be detached at a front position near the front end of the frame 23. And a holding mechanism 34 for holding the same.

The urging mechanism 33 comprises a rack 35 formed on the upper surface of the frame 23, and a spiral spring 36 and a pinion 37 mounted on the back side of the slider body 32a.

The rack 35 is formed between the rails 31 so as to extend in parallel with the rails 31. The pinion 37 is mounted so as to be rotatable with respect to the slider main body 32a and rollable with the rack 35 in an engaged state. The spiral spring 36 is interposed between the pinion 37 and the slider main body 32a, and constantly urges the pinion 37 in a fixed rotational direction, that is, in a rolling direction on the rack 35 toward the rear end side of the frame 23. I have. This spiral spring 36
Is most tightened when the slider 32 is located at the front of the front end of the frame 23, and the slider 3
2 is most loosened when it is arranged at a position behind the rear end of the frame 23. That is, the spiral spring 3
6, the biasing force acting on the slider 32 becomes maximum when the slider 32 is at the front position, and becomes minimum when the slider 32 is at the rear position.

A guide groove 38 is provided between the rails 31 so as to extend along the rack 35. A cylindrical guide pin 39 projecting from the back surface of the slider body 32a is engaged with the guide groove 38. When the slider 32 moves on the frame body 23 in the front-rear direction, rattling in a direction orthogonal to the moving direction is suppressed.

In the vicinity of the rear end of the upper surface of the frame 23,
A pair of regulating projections 40 are provided. On the contrary,
A pair of buffer protrusions 41 are provided at the rear end of the rear surface of the slider body 32a so as to correspond to the restriction protrusions 40. When the slider 32 is moved to a position rearward of the frame 23, the buffering protrusion 41 contacts the regulating protrusion 40 to position the end point of the movement of the slider 32, and the shock at the time of the contact. And plays a role in suppressing noise and realizing a natural feeling of stopping.

As shown in FIGS. 3, 6, and 7, the holding mechanism 34 includes a pair of guide ridges 44 and a heart cam 45 provided near the front end of the upper surface of the frame 23, and a back surface of the slider body 32a. And a rotation pin 46 provided at the bottom. The guide projection 44 has a first inclined wall surface 47, a first accommodation concave portion 48, a straight wall surface 49, a projecting wall surface 50, a second inclined wall surface 51, and a second accommodation concave portion 52.

The heart cam 45 has a holding recess 5.
3, a first oblique cam surface 54, a straight cam surface 55, a second oblique cam surface 56, and a third oblique cam surface 57 are formed. On the other hand, the rotation pin 46 is connected to the rotation holding arm 58 and the rotation shaft 5.
9 and a sliding pin 60. The rotating shaft 59 is
The base end of the rotation holding arm 58 is supported rotatably within a predetermined angle range with respect to the slider body 32a. The sliding pin 60 enters between the guide ridge 44 and the heart cam 45 and engages with the holding recess 53 of the heart cam 45,
The lid 24 is held at a closed position described later.

As shown in FIGS. 1 to 5, on the back surface of the lid 24, a rotating arm 63 is fixed by screws.
The base end of the rotating arm 63 is rotatably fixed to substantially the center of the side surface of the frame 23. At the upper end of the lid 24, the other end of a connecting arm 64 as a connecting body rotatably connected at one end to both side surfaces of the slider body 32a via a first connecting shaft 64a is connected. Second
It is rotatably connected via a connection shaft 64b.

As a result, the lid 24 is attached to the slider 3
In conjunction with the movement of the frame 23 in the front-rear direction, the rotation between the closed position in front of the frame 23 and the open position above the frame 23 around the base end of the rotating arm 63 as the center of rotation. It is being moved. That is, when the slider 32 is arranged at the front position, the lid 24 is arranged at the closed position, and when the slider 32 is arranged at the rear position, the lid 24 is arranged at the open position.

In this cover 21, the frame 23
Are fixed in the center console 22 in an inclined state such that the upper surface has a downward slope from the front to the rear. In a state where the lid 24 is located at the open position, the acoustic device 26 mounted in the opening 25 of the frame 23 is exposed with its front surface inclined slightly upward. Then, it becomes possible to insert and remove a cassette tape, a compact disk, and the like with respect to the audio device 26. On the other hand, when such an insertion / removal operation is not required, the front surface of the audio device 26 is placed on the lid 2 by disposing the lid 24 at the closed position.
4 to improve the design of the center console 22.

As shown in FIGS. 1, 4 and 9,
In the vicinity of the lower end of the surface of the lid 24, a plurality of (three in this embodiment) finger hooking ridges 65 extending in the longitudinal direction of the lid 24 project in parallel with each other. A concave portion 66 is formed on the surface of the lid 24 above the finger hooking ridge 65 along the finger hooking ridge 65.

Next, the opening and closing operation of the lid 24 in the cover 21 of the present embodiment will be described with reference to FIGS. 2, 3 and 6 to 8.
It will be described based on. In this cover 21, the lid 2
When the cover 4 is disposed in the closed state shown by the solid line in FIG. 8, only the cover 24 is exposed to the occupant of the vehicle. In this state, the slider 32 is arranged at the front position by the urging force of the spiral spring 36 of the urging mechanism 33, and the holding mechanism 34
Is engaged with the holding recess 53 of the heart cam 45.

In this state, when the occupant puts a finger on the finger hook ridge 65 of the lid 24 and the lid 24 is slightly pushed into the frame 23 against the urging force of the spiral spring 36, the sliding is performed. The moving pin 60 is slid along the first oblique cam surface 54 of the heart cam 45 and the first inclined wall surface 47 of the guide ridge 44. Then, the sliding pin 60 is connected to the first accommodation recess 4 of the guide ridge 44.
8, the further forward movement of the slider 32 is restricted, and the movement of the lid 24 toward the frame 23 is also restricted, and the lid 24 is locked by a chain line shown in FIG. Reach the escape position.

In this state, when the occupant removes his / her finger from the finger hook ridge 65, the heart cam 45 does not exist in the direction along the movement line of the slider 32 in the first accommodating recess 48.
The slider 32 is moved by the biasing force of the spiral spring
Move to the back side of. During this movement, the sliding pin 60
Passes between the straight wall surface 49 of the guide ridge 44 and the straight cam surface 55 of the heart cam 45 and abuts on the protrusion wall surface 50 of the guide ridge 44. By this contact, the sliding pin 60 is moved toward the center of the frame 23 along the projecting wall surface 50, and the rotation holding arm 58 is rotated about the rotation shaft 59. Then, as the slider 32 moves backward, the sliding pin 60 is completely separated from the guide ridge 44 and the heart cam 45. Eventually, when the slider 32 reaches the rear position of the rear end of the frame 23, the buffer protrusion 41 of the slider main body 32a comes into contact with the regulating protrusion 40 of the frame 23, and the lid 24 is indicated by a two-dot chain line in FIG. In the open position shown.

The occupant places his finger on the finger ridge 65 of the lid 24 disposed at the open position, and turns the lid 24 in the direction of the occupant himself against the urging force of the spiral spring 36. When moved, the slider 32 is moved to the front position side of the frame 23 in conjunction with the rotation of the lid 24. This slider 32
When the slider 32 approaches the front position, the sliding pin 60 of the holding mechanism 34 is moved to the second inclined wall surface 51 of the guide ridge 44 or the second inclined cam surface 5 of the heart cam 45.
5 and the second inclined wall surface 51 or the second inclined cam surface 55
Along the front side of the frame 23. Then, the sliding pin 60 is guided into the second accommodation recess 52 of the guide ridge 44, and the forward movement of the slider 32 is restricted, and the rotation of the lid 24 is also restricted.

In this state, when the occupant releases his / her finger from the finger ridge 65, the slider 32 is biased by the spiral spring 36 which is tightened as the slider 32 moves forward.
Attempts to return to the rear side of the frame 23. Here, the third oblique cam surface 57 of the heart cam 45 is disposed so as to face the direction along the movement line of the slider 32 in the opening of the second housing recess 52. Therefore, the sliding pin 60
Abuts on the third oblique cam surface 57 and slides along the third oblique cam surface 57, and is guided to the holding recess 53. Then, the slider 32 is urged toward the rear side of the frame body 23 by the urging force of the spiral spring 36 in a state where the slide pin 60 is engaged with the holding recess 53, and is held at the front position.
For this reason, the lid 24 is held at the closed position so as to cover the frame 23.

Next, the center (first fulcrum P1) of the first connecting shaft 64a connecting the connecting arm 64 and the slider 32 in a state where the lid 24 is located at the open position,
The center (second fulcrum P2) of the second connecting shaft 64b connecting the connecting arm 64 and the upper end of the lid 24;
The positional relationship with the center of the third shaft support (the rotation center P3 of the lid 24) will be described.

As shown in FIG. 8, the cover 2 of this embodiment
In FIG. 1, in a state where the lid 24 is opened, that is, in a state where the slider 32 is located at the rear position, a straight line L1 connecting the first fulcrum P1 and the second fulcrum P2 becomes a movement line L2 of the slider 32. The first and second fulcrums P1 and P2 are arranged so as to intersect with. More specifically, the second fulcrum P2 is arranged above the movement line L2 of the slider 32 at a predetermined distance. At this time, a straight line L1 connecting the first fulcrum P1 and the second fulcrum P2, the rotation center P3 of the lid 24 and the second fulcrum P
Angle between the straight line L3 and the straight line L3 between
It is preferable that the angle be in the range of 125 °, and 118 ° to 1
More preferably, it is within the range of 20 °.

In the cover 21 having such a structure, when the holding mechanism 34 releases the lid 24 from the closed position at the closed position, the biasing force of the spiral spring 36 moves the slider 32 from the front position to the rear position. Moving. This slider 32
, The upper end of the lid 24 is connected via a connection arm 64. For this reason, the lid 24 is rotated about the rotation center P3 on the side surface of the frame 23 while being lifted from the closed position in front of the frame 23 in conjunction with the movement of the slider 32. When the slider 32 reaches the rear position of the frame 23, the lid 24 is housed in the opening of the center console 22 so that most of the cover almost overlaps with the upper surface of the frame 23, and the lid 24 is in the open position. Be placed.

As the slider 32 moves from the front position to the rear position, the spiral spring 36 is gradually relaxed, and the urging force on the slider 32 also decreases. As the urging force decreases, the moving speed of the lid 24 also decreases.

Here, in the cover 21 of the present embodiment, the fulcrums connecting the frame 23, the slider 32 and the lid 24 and the rotation centers P1 to P3 are arranged as described above. Therefore, even when the slider 32 approaches the rear position, which is the end point of the movement, on the frame 23 fixed in the inclined state, a force for increasing the moving speed of the slider 32 due to the inertial weight of the lid 24 is generated. Is suppressed. Thereby, as shown by the solid line in FIG. 10, the moving speed of the lid 24 hardly jumps up near the open position and converges to a substantially constant moving speed.

Therefore, according to the present embodiment, the following effects can be obtained. (A) With this cover 21, when the lid 24 is opened, it is possible to prevent the moving speed of the lid 24 from jumping near the open position. Thereby, the operation feeling at the time of the opening operation of the lid 24 can be improved.

(B) The cover 21 is provided with a plurality of finger hooks 65 extending in the longitudinal direction of the cover 24 near the lower end of the surface of the cover 24. A concave portion 66 is provided on the upper side along the finger hook ridge 65.

Therefore, at the time of opening / closing operation of the lid 24, it is easy to put a finger on the finger hook ridge 65, and it is possible to suppress slipping of the put finger. Thereby, the lid 24
Can be more reliably pushed to the engagement / disengagement position, and even when there is an obstacle such as a shift knob in front of the lid 24, the lid 24 can be easily opened. Further, since the presence of the finger hook ridge 65 is emphasized by the concave portion 66, the finger hook ridge 65 is given distinctiveness as an operation unit for opening and closing the lid 24. Therefore, a good operation feeling when opening and closing the lid 24 can be realized.

(Modification) The embodiment of the present invention may be modified as follows. In the above-described embodiment, the cover opening / closing mechanism of the present invention is embodied in the cover 21 of the audio device 26 housed in the center console 22 of the vehicle. However, for example, a small case mounted on the center console, instrument panel, or the like. For example, the opening and closing mechanism of the lid may be embodied.

The number of the finger ridges 65 may be different from that described in the above embodiment. That is, two or four or more finger hanging ridges 65 may be provided.・ For the finger ridge 65, for example, the surface is roughened,
Further non-slip processing may be performed, such as forming a layer of a substance that increases the coefficient of friction with the finger on the surface. Further, the finger ridge 65 may be formed into one piece, and the same anti-slip processing may be performed on the surface thereof. Alternatively, the finger hook ridge 65 itself may be formed of a substance having a large coefficient of friction with the finger.

In this case, substantially the same effects as in the above embodiment can be obtained.

[0048]

As described above in detail, according to the invention described in the claims of the present application, it is possible to suppress the moving speed of the lid from jumping near the open position. In addition, it is possible to easily put a finger on the ridge and prevent the ridge from slipping, and it is possible to give distinctiveness that the ridge is an operation unit for opening and closing the lid by highlighting the presence of the ridge. Thus, the lid can be easily opened and closed regardless of whether there is an obstacle in front of the lid. Therefore, a good operation feeling when opening and closing the lid can be realized.

[Brief description of the drawings]

FIG. 1 is a perspective view showing an embodiment in which a lid opening / closing mechanism of the present invention is embodied in a cover of an in-vehicle audio device.

FIG. 2 is a partially cutaway side view of the cover of FIG. 1;

FIG. 3 is a plan view of the cover of FIG. 1;

FIG. 4 is a front view of the cover of FIG. 1;

FIG. 5 is a sectional view taken along line 5-5 of FIG. 3;

FIG. 6 is a perspective view showing a guide ridge and a heart cam of the holding mechanism.

FIG. 7 is a sectional view taken along line 7-7 of FIG. 3;

FIG. 8 is an explanatory diagram relating to an open / closed state of a lid.

FIG. 9 is an enlarged cross-sectional view showing a finger hook.

FIG. 10 is a graph relating to a moving speed of a lid.

FIG. 11 is a perspective view showing a mounted state of the cover of FIG. 1;

FIG. 12 is a side view showing a conventional cover.

[Explanation of symbols]

21: cover, 23: frame as base member, 24: lid, 32: slider as moving body, 33: urging mechanism, 3
4 ... holding mechanism, 64 ... connecting arm as connecting body, 65
.., Finger ridge as a ridge, 66, concave portion, L1, a straight line connecting the first fulcrum and the second fulcrum, L2, a movement line, L3.
A straight line connecting the rotation center of the lid and the second fulcrum, P1.
, The angle between the straight line connecting the first fulcrum and the second fulcrum and the straight line connecting the rotation center of the lid and the second fulcrum.

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Shigeru Yabutani 1 Ochiai Nagahata, Kasuga-cho, Nishi-Kasugai-gun, Aichi Prefecture Toyoda Gosei Co., Ltd. Address Toyoda Gosei Co., Ltd. F-term (reference) 3D022 CA07 CB01 CC18 CD13 CD14 CD17 3E084 AA05 AA14 AB10 BA02 CA03 FA08 GA06 GB06 GB12 KA16

Claims (4)

[Claims] 1. A base member, a lid body that can be switched between a closed position in front of the base member and an open position above the base member, and a holding mechanism that holds the lid body in the closed position. When,
A moving body that moves between a front position set in front of the upper surface of the base member and a rear position set with a predetermined drop from the front position behind the upper surface of the base member; A coupling body for coupling the upper end of the lid in a closed state, and a biasing mechanism for biasing the moving body to the rear position side, when the holding of the lid by the holding mechanism is released, the A lid body in which the movable body is moved from a front position to a rear position by an urging force of an urging mechanism, and the lid body is rotated from the closed position to the open position in conjunction with the movement of the movable body. In the opening / closing mechanism, a first fulcrum connecting the connecting body and the moving body and a top connecting the connecting body and an upper end of the lid in a state where the lid is disposed at the open position. The straight line connecting to the fulcrum 2 corresponds to the movement line of the moving body. Lid opening and closing mechanism, characterized in that it has to be crossed Te. 2. The apparatus according to claim 1, wherein the second fulcrum is arranged above the moving line of the moving body at a predetermined distance while the lid is arranged at an open position. The lid opening and closing mechanism according to claim 1. 3. A linear line connecting the first fulcrum and the second fulcrum and a rotation of the lid disposed on a side surface of the base member in a state where the lid is disposed at an open position. The angle between the center and the straight line connecting the second fulcrum is 115 °
The lid opening / closing mechanism according to claim 1 or 2, wherein the angle is within the range of 125 °. 4. A plurality of ridges extending along the longitudinal direction of the lid near the lower end thereof on the surface of the lid, and the ridges are formed above the plurality of ridges along the ridges. The lid opening / closing mechanism according to any one of claims 1 to 3, wherein a recess is provided in the lid.