JP3291611B2 - Lid opening and closing device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an opening and closing device for a lid rotatably attached to openings of various box bodies, including a lid of an automobile console box.

[0002]

2. Description of the Related Art Regarding a device for opening and closing a lid of an automobile console box from one direction and a device for opening and closing it from two directions, an operation button for opening and closing the lid is usually provided on the lid side. A lid is opened and closed by disposing an interlocking hinge pin and projecting the hinge pin into and out of a shaft hole provided at the opening edge of the box body.

[0003]

However, under the conventional opening and closing device, whether the lid is opened and closed from one direction or the lid is opened and closed from two directions, basically, The inner end of the hinge pin is supported only by the operation button or the cam groove formed on the component side connected to the operation button, and the outer end of the hinge pin is supported only by the support hole formed on the wall surface side of the lid. With this configuration, the outer end of the hinge pin is made to protrude and retract into the shaft hole of the box body by supporting and obtaining the action of the cam groove.

[0004] For this reason, in the conventional opening / closing device, it goes without saying that the support of the hinge pin is naturally unstable. In particular, the longer the hinge pin becomes, the more the movement of the hinge pin becomes. There is a large problem that the hinge pin is unintentionally rattled.

[0005]

SUMMARY OF THE INVENTION The present invention has been developed in order to effectively solve the problems of the conventional switchgear, and the invention described in claim 1 is an operation for opening and closing the lid. In a lid opening / closing device having a button and a hinge pin that moves in and out of a shaft hole provided in a box body in conjunction with the operation button, an independent guide member for guiding the movement of the hinge pin is provided, and the independent guide member is provided. Has a sliding guide groove having a rectangular cross section and an upper part and a lower part opened, and the hinge pin has a part having a rectangular cross section to be fitted into the sliding guide groove, and Forming a pair of convex rails on one of the opposing inner surface in the middle of the upper and lower opening portions or the opposing outer surface of a portion exhibiting a rectangular cross section of the hinge pin,
On the other hand, a configuration is adopted in which a pair of concave rails engaging with each of the convex rails is formed.

According to a second aspect of the present invention, based on the first aspect, the independent guide member has a sliding guide groove having a rectangular cross section for fitting the inner end of the hinge pin, and the sliding guide groove is provided. A pair of convex rails is formed on the opposing inner side surface defining the pair, and a hinge pin forms a pair of concave rails engaging with the respective convex rails on the opposing outer side surface of the inner end having a rectangular cross section, and the inner end is formed. A configuration is employed in which an elastic arm is extended at the edge, and a tapered projection is formed on the lower surface of the elastic arm so as to elastically contact the pair of convex rail edges.

According to a third aspect of the present invention, on the premise of the first and second aspects, a pair of elastic lip pieces are extended outward at the opening edge of the sliding guide groove into which the hinge pin is fitted. A configuration is adopted in which the tip of each elastic lip piece is elastically contacted with the side surface of the hinge pin.

According to a fourth aspect of the present invention, on the premise of the first to third aspects, a rib wall which comes into contact with a center portion of the hinge pin is projected on the lid substrate, and the hinge pin is bent by the rib wall. The configuration was adopted.

[0009]

[0010]

Therefore, according to the present invention, in the first aspect, since the independent guide member guides the movement of the hinge pin, the rattle of the hinge pin is effectively suppressed as compared with the conventional device. Of course, it is possible to obtain the engagement state of the pair of convex rails and the pair of concave rails, and to guide the movement of the hinge pin in the slide guide groove, so that the slide guide groove of the guide member and the hinge pin The accuracy of the positional relationship is improved, and particularly, the backlash of the hinge pin in the vertical direction can be effectively suppressed, and the hinge pin can be temporarily assembled to the guide member, so that the assembling work becomes easy. Also, with the upper and lower parts of the sliding guide groove open, the necessary clearance is secured regardless of the presence or absence of burrs generated at the part of the hinge pin having a rectangular cross section or the upper and lower parting lines at the inner end, and its size. Thus, the movement of the hinge pin can be guided.

According to the second aspect of the present invention, the guide member slides in such a manner that the engagement between the pair of convex rails and the pair of concave rails is obtained, and the movement of the hinge pin is guided in the slide guide groove. Accuracy in the positional relationship between the guide groove and the hinge pin is improved, and particularly, rattling of the hinge pin in the vertical direction can be effectively suppressed, and the hinge pin can be temporarily assembled to the guide member, thereby facilitating the assembling work. In addition, in addition to the above, the tapered protrusion of the elastic arm is elastically contacted with the edge of the pair of convex rails, so that further play can be suppressed and the hinge pin is automatically moved to the centering position in the sliding guide groove. Can be energized.

According to a third aspect of the present invention, the tip of the pair of elastic lip pieces is elastically contacted with the side surface of the hinge pin.
The rattling of the hinge pin can be suppressed.
With the relation that the central portion of the hinge pin is bent, the play of the hinge pin can be synergistically suppressed in combination with the independent guide member.

[0014]

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, the present invention will be described in detail with reference to a preferred embodiment. The opening and closing device according to the embodiment is a device for opening and closing a lid of an automobile console box from two directions. Although it was developed, it is characterized by adopting the following configuration.

Therefore, first, from the main body side of the console box, in the present embodiment, as shown in FIG. 1, upright walls 1 are provided before and after the opening edge of the box body B, and each of the upright walls 1 is provided. Shaft holes 3 are provided at both ends with respect to the facing surface of the wall 1.
Are fixed individually.

On the other hand, as shown in FIG. 2, the lid L, which is rotatably attached to the opening of the box body B, is located near the front of a rectangular substrate 4 made of synthetic resin, as will be described later. The area 5 in which the movable body 16 is mounted so as to be movable in the left-right direction is positively defined, and a holding block 6 having left and right guide ports 6a is provided substantially at the center of the area 5, and is moved into the holding block 6. The configuration is such that the compression coil spring 7 that constantly biases the body 16 to the centering position is housed.

In the vicinity of one side of the holding block 6, a beak-shaped check lever 8 is rotatably supported via a support wall 9, and one end 8a of the check lever 8 is moved in the direction of the holding block 6. And the other end 8b faces outward from inside the window 10 opened on the front wall side of the substrate 4, and until the other end 8b contacts the bottom of the window 10. The one end 8a of the check lever 8 is biased upward by a torsion spring 11.

Further, on the opposite side of the check lever 8 in the section 5, a guide cam 12 for guiding the movement of a pair of bent front ends 20a of a spring bar 20, which will be described later.
Are provided symmetrically. The left-right symmetric guide cam 12 defines the forward path and the return path of each of the bent front ends 20a through the reversing protrusions 14, and has a guide wall 15 erected at least on the return path side.

As described above, the moving body 16 is an integrally molded product of synthetic resin having a narrow middle portion and wide end portions as shown in FIG. A pair of left and right operation buttons 17A and 17B are integrally connected to each other, and a stopper projection 18 is formed on a side surface of the narrow middle portion facing the check lever 8, and faces the guide cam 12 at the middle portion. A holder wall 19 is integrally formed on the side surface, and the pair of bent front ends 20a is formed on the holder wall 19.
Is fixed. Further, on both sides of the intermediate portion near both ends, a flange portion 16a for locking a temporary assembling claw 30 of the guide member 25 described later.
Is formed.

In addition, a pair of leg pieces 21 are formed at the center of the lower surface of the intermediate portion through the respective guide ports 6a of the holding block 6 and interfere with the compression coil spring 7, and are wide. , A pair of cam grooves 22 having a restriction portion 22a and a non-restriction portion 22b are formed so as to face each other. The relationship between the restricting portion 22a and the non-restricting portion 22b of each cam groove 22 is defined by a pair of cam grooves 22.
In the state in which each of the restricting portions 22
are set in such a manner that each of the non-regulating portions 22b has a parallel shape with the same maximum interval width.

The moving body 16 is provided with a pair of long and short hinge pins 23.2 located on each side in the opposed cam groove 22.
4 are mounted movably in the left-right direction in the section 5 of the board 4 described above with the followers 23a and 24a fitted therein. Are mounted via two guide members 25 and two decorative frames 38 which are fixed to each other.
Reference numeral 4 indicates that the two guide members 25 guide the movement of the movement.

The guide member 25 is integrally formed of a synthetic resin into a block shape, and as shown in FIG. 4, there is an empty space inside the movable body 16 which allows the wide end of the movable body 16 to move. Place 26
And a space 2 allowing movement of the narrow intermediate portion of the moving body 16
7 and a sliding guide groove 28 on the outer side for receiving the inner ends of the long and short hinge pins 23 and 24 orthogonal to the respective cavities 26 and 27 to define the cavities 26. A pair of guide projections 29 for slidingly guiding the outer edge of the wide end of the moving body 16 are provided on the both side walls, and the moving body 16 is provided on both side walls defining the space 27. The pair of temporary assembling elastic claws 30 that engage with the flange portion 16a is obliquely provided.

In particular, as shown in the figure, a guide groove portion 28a for the short hinge pin 23, which is open on both the upper and lower sides, is provided with a sliding guide groove 28, as shown in FIG. Guide groove 28b for hinge pin 24
And the respective guide groove portions 28a.
A pair of convex rails 32 that engage with a concave rail 35 described later is formed on each of the opposing inner side surfaces that define 28b, and a pair of elastic lips are provided on each of the open edges of each of the guide groove portions 28a and 28b. While the piece 33 is extended outward so that the tip side narrows, each of the guide grooves 28a and 28
A posture holding piece 34 that comes into contact with the surface of the substrate 4 is provided vertically below b.

On the other hand, the long and short hinge pins 23.2 fitted into the respective guide grooves 28a and 28b of the guide member 25.
As for FIG. 4, as shown in FIG. 5, in each case, the inner end portion has a cross-sectional angle shape similar to the cross-sectional angle shape of the guide groove portions 28a and 28b, and the inner end portions having the cross-sectional angle shape are opposed to each other. On the side surface, a pair of concave rails 35 engaging with the pair of convex rails 32 is formed, and an elastic arm 36 is extended on the upper edge of the inner end. The configuration is such that a tapered projection 37 elastically contacting the edge is formed.

Therefore, the guide groove 28 of the guide member 25
a and 28b are fitted into the inner ends of the long and short hinge pins 23 and 24, and the followers 23a of the hinge pins 23 and 24 are fitted.
The two end portions and the middle portion of the moving body 16 are inserted into the corresponding cavities 26 of the guide member 25 while the fitting 24a is inserted into the cam groove 22.
27, the elastic claws 30 for temporary assembling are respectively engaged with the flanges 16a at the intermediate portion, so that the movable body 16 and the long and short hinge pins 2 are fixed to the guide members 25 on each side.
3.24 can be temporarily assembled at the same time.

Then, after that, each guide member 25 is connected to the substrate 4.
Of the guide member 25.
Is fixed to the substrate 4 at the same time as the moving body 16 is movably mounted in the area 5 and the long and short hinge pins 23.2.
4 are supported in the corresponding guide grooves 28a and 28b so as to be able to move in and out.

Further, in this state, as shown in FIG. 6, the long and short hinge pins 23 and 24 are
And the pair of concave rails 35 are engaged to be supported in the corresponding guide groove portions 28a and 28b. Therefore, not only in the left-right direction, but especially in the respective guide groove portions 28a and 2
8b, the play in the vertical direction can be suppressed, and each hinge pin 23, 24 of the pair of elastic lip pieces 33 can be suppressed.
Elastic contact with the side surface of the elastic arm 36 and the tapered protrusion 37
The elastic contact with the edge of each convex rail 32 further effectively suppresses the backlash.

Even if burrs are formed on the upper and lower parting lines at the inner ends of the hinge pins 23 and 24 having a rectangular cross section, the upper and lower portions of each of the guide grooves 28a and 28b are open. Regardless of the size, the necessary clearance can be secured and the smooth movement of the hinge pins 23 and 24 can be guaranteed.

In addition, the fact that the tapered projection 37 of the elastic arm 36 elastically contacts the edge of each of the convex rails 32 is coupled with the engagement between the convex rails 32 and the concave rails 35 described above.
24 can be automatically biased to the centering position in the guide grooves 28a and 28b, so that the guide grooves 28a and 28b of the guide member 25 and the hinge pins 23 and 24
Is improved, and even if each of the hinge pins 23 and 24 is twisted, the twist is effectively suppressed, and the positional relationship between the two can be maintained in an ideal state.

When one of the operation buttons 17A or 17B integrally connected to the moving body 16 is pressed inward, a pair of long and short hinge pins 23 located on the pressed side are pressed.
・ 24 obtains the guide action of the above-described guide grooves 28a and 28b including the elastic contact of the pair of elastic lip pieces 33, and approaches each other by the action of the restricting portion 22a of the opposed cam groove 22 having a C-shape. However, the pair of long and short hinge pins 23 and 24 on the opposite side move in the direction approaching each other due to the action of the parallel non-regulating portion 22 b of the opposed cam groove 22. Absent.

In the drawing, reference numeral 39 denotes a support hole for supporting the outer end portion of the short hinge pin 23 on each side, and corresponds to the shaft hole 3 of the front bracket 2 described above, and corresponds to the front wall of the substrate 4. Conversely, reference numerals 40 denote support holes for supporting the rear ends of the long hinge pins 24 present on each side, and correspond to the shaft holes 3 of the rear bracket 2 on both sides of the rear wall of the substrate 4. Is formed. Reference numeral 41 denotes a plurality of rib walls provided near the rear portion of the substrate 4, which abut against the central portions of the long hinge pins 24 existing on each side to bend the long hinge pins 24 slightly outward. By utilizing the reaction force, rattling of the hinge pin 24 can be eliminated without using a nonwoven fabric or the like, thereby preventing chattering noise.

Therefore, in the present embodiment, the long and short hinge pins 23 and 24 and the moving body 16 on each side are arranged in the area 5 of the substrate 4 via the guide member 25, If a suitable cover body 42 is put on the top 4, the lid L can be assembled very easily, and thereafter, by pressing the integrated operation buttons 17 </ b> A and 17 </ b> B on each side, Existing pair of long and short hinge pins 23.2
If the outer end of the bracket 4 is engaged with the corresponding shaft hole 3 of the front and rear bracket 2, the lid L can be rotatably attached to the box body B side in the same manner as the conventional one. .

When the cover L is closed, as shown in FIG. 7, the moving body 16 integrally provided with the operation buttons 17A and 17B is a compression body stored in the holding block 6. The area 5 of the substrate 4 is
, The rear ends of the pair of long and short hinge pins 23 and 24 on each side are inserted into the corresponding shaft holes 3 of the front and rear brackets 2 through the respective support holes 39 and 40. Engagement ensures a secure occlusion.

In this closed state, each follower 23a of a pair of long and short hinge pins 23 and 24 present on each side.
24a is located at the boundary between the regulating portion 22a and the non-regulating portion 22b of the opposing cam groove 22 as shown in the drawing, while the other end 8b of the check lever 8 is in contact with the upper edge of the front bracket 2 of the box body B. The stopper projection 18 of the moving body 16 is located above the one end 8a of the check lever 8 because the end 8a of the movable lever 16 is pressed downward against the spring pressure of the torsion spring 11. It is only located. or,
Each bent end portion 20a of the spring bar 20 waits at the neutral position of the corresponding guide cam 12.

In the closed state of the lid L, if the lid L is rotated leftward to open the opening of the box body B, the right operation button 17A is connected to the moving body 16. When pressed inward against the spring pressure of the compression coil spring 7 housed in the holding block 6 together,
As shown in FIG. 8, the cam groove 2 interlocked with the movement of the moving body 16
2, the pair of long and short hinge pins 23 and 24 present on the right side are reliably guided by the guide grooves 28a and 28b of the guide member 25, and the front and rear brackets 2 are not inadvertently rattled. From each shaft hole 3. In addition, since the long hinge pin 24 is further subjected to the abutting action of the rib wall 41, the rattling thereof is more effectively suppressed.

When the operation button 17A is pressed, the bent front end portion 20a located on the left side of the spring bar 20 moves in conjunction with the moving body 16 to move the corresponding outward movement of the guide cam 12 to the reversing protrusion 14a. However, when the bent front end portion 20a moves over the reversing protrusion 14 and moves to the entrance side of the return path, the pressing load on the operation button 17A changes, and at the same time, a pleasant sound called rattling is generated. As shown in the figure, the bent tip portion 20a located on the right side of the spring bar 20 simply moves leftward from its neutral position without performing any operation.

Further, when the right operation button 17A is pressed inward, as shown in FIG.
Naturally, the moving body 16 integrated with the moving member 16 also moves in the same direction together with the left operation button 17B. At this time, the sliding action of the guide projection 29 of the guide member 25 on each side is performed. So, the movement will be guided reliably,
There is no worry that the moving body 16 will be loosely inadvertently.

Then, when the cover L is slightly rotated upward while pressing the operation button 17A, the check lever 8
The contact state of the other end 8b of the check lever 8 with the upper edge of the front side bracket 2 is immediately released, whereby the one end 8a of the check lever 8 is rotated upward by the spring pressure of the torsion spring 11, and , The stopper projection 18 of the moving body 16 on its side.
Automatically abut.

As a result, the movable body 16 is locked in place against the spring pressure of the compression coil spring 7 biasing to the centering position, and is prevented from returning to the centering position, while being located on the left side. The bent front end portion 20a of the spring bar 20 also temporarily stops at the entrance side of the return path, which has passed over the above-described reversing protrusion 14.

Accordingly, when the lid L is rotated leftward with the pair of long and short hinge pins 23 and 24 engaged in the shaft holes 3 of the front and rear brackets 2 on the left side, the lid L is rotated as shown in FIG. The opening of the box body B can be opened as shown in FIG. Moreover, the opening operation of the lid L is performed by the operation button 17.
After turning the lid L slightly upward while pressing A,
Even if the hand is released, there is no fear that the moving body 16 returns to the original centering position together with the operation button 17A.
Is convenient. Further, in this state, even if the left operation button 17B is erroneously pressed, the pressing operation can also be prevented by the contact of the stopper projection 18 with the one end 8a of the check lever 8.

When the lid L in the fully opened state is closed, the lid L is attached to the left and right hinge pins 23.
When the cover L is rotated to the right around the rotation axis and the cover L is lowered until it comes into contact with the edge of the opening of the box body B, the other end 8b of the check lever 8 facing outward from the window 10 is turned on. The check lever 8 contacts the upper edge of the front bracket 2
Is pressed downward against the spring pressure of the torsion spring 11 to release the abutment of the stopper projection 18 against its side surface. At the same time as returning to the centering position again by the spring pressure, in conjunction with this, the pair of long and short hinge pins 23 and 24 located on the right side also obtain the action of the restricting portion 22a of the cam groove 22 and move from their respective support holes 39 and 40. The lid L is automatically closed in each of the corresponding shaft holes 3 of the front and rear brackets 2 and the lid L is closed.

At this time, the bent end portion 20a of the spring bar 20 located on the left side moves in the return path of the corresponding guide cam 12 in conjunction with the movement of the moving body 16, and the guide cam 12 At the same time as returning to the neutral position, the bent tip 2 of the spring bar 20 located on the right side
0a also returns to the neutral position of the corresponding guide cam 12.

Conversely, when the lid L is turned rightward to open the opening of the box body B, although not specifically shown, this time the left operation button 17B is held by the holding block. 6 and press inward against the spring pressure of the compression coil spring 7 to perform the same operation as described above.
Also, when closing the lid L in the fully open state,
The same operation as described above is performed. Note that even in this case, the long and short hinge pins 23 and 24 on the left side
Guide grooves 28a and 28b of independent guide members 25
Therefore, it is needless to say that the hinge pins 23 and 24 can be effectively prevented from being inadvertently rattled.

In the above embodiment, the convex rails 32 are formed on the guide grooves 28a and 28b, and the concave rails 35 are formed on the inner ends of the hinge pins 23 and 24. The present invention is not limited to this,
Conversely, a concave rail 35 is formed on the guide groove portions 28a and 28b side, and a convex rail 32 is formed on the inner end side of the hinge pins 23 and 24.
Is optional depending on the implementation.

[0045]

As described above, according to the present invention, the adoption of the above-described structure allows the independent guide member to guide the movement of the hinge pin with the independent guide member. Of course, the backlash of the hinge pin can be effectively suppressed, but the engagement state of the pair of convex rails and the pair of concave rails is obtained, and the movement of the hinge pin is guided in the sliding guide groove. The precision in the positional relationship between the sliding guide groove and the hinge pin is improved, and in particular, the vertical play of the hinge pin can be effectively suppressed, and the hinge pin can be temporarily assembled to the guide member, so that the assembling work is easy. Become. Also, with the upper and lower parts of the sliding guide groove open, the necessary clearance is secured regardless of the presence or absence of burrs generated at the part of the hinge pin having a rectangular cross section or the upper and lower parting lines at the inner end, and its size. do it,
The movement of the hinge pin can be guided. Under claim 2,
Again, the engagement between the pair of convex rails and the pair of concave rails is obtained, and the movement of the hinge pin is guided in the sliding guide groove, so that the accuracy of the positional relationship between the sliding guide groove of the guide member and the hinge pin is improved. In addition, in particular, rattling in the vertical direction of the hinge pin can be effectively suppressed, and the hinge pin can be temporarily assembled to the guide member, thereby facilitating the assembling operation. In addition, according to the second aspect of the present invention, in addition to the above, the tapered projection of the elastic arm is elastically contacted with the pair of convex rail edges. Can be automatically biased to the centering position in the inside.

Further, according to the third aspect of the present invention, since the tips of the pair of elastic lip pieces are elastically contacted with the side surfaces of the hinge pin, the backlash of the hinge pin can be suppressed. Can be flexed, and together with the guiding action of the independent guide member, the rattling of the hinge pin can be synergistically suppressed.

[Brief description of the drawings]

FIG. 1 is a perspective view showing a structure on a box body side of a switchgear according to an embodiment of the present invention.

FIG. 2 is an exploded perspective view showing a structure of the lid side.

FIG. 3 is a perspective view showing only a moving body partially disassembled and viewed from the back side.

4A is a plan view of a guide member, and FIG.
FIG. 4 is a sectional view taken along line AA of FIG.

5A is a perspective view of a main part showing a structure of an inner end side of a hinge pin, FIG. 5B is a sectional view taken along line BB of FIG. 5A, and FIG. 5C is a sectional view taken along line CC of FIG. 5A; It is.

FIG. 6 is an essential part cross-sectional view showing a state where a hinge pin is fitted into a guide groove of the guide member.

FIG. 7 is a cross-sectional view showing a closed state of a lid.

FIG. 8 is a cross-sectional view showing a state where the right operation button is pressed.

FIG. 9 is a perspective view showing a state where a lid is opened.

[Explanation of symbols]

 B Box body L Cover 3 Shaft hole 4 Substrate 5 Moving body mounting area 8 Check lever 12 Guide cam 16 Moving body 17A Right operation button 17B Left operation button 18 Stopper projection 19 Holder wall 20 Spring bar 22 Cam groove 23 Short dimension Hinge pin 23a Follower of short hinge pin 24 Long hinge pin 24a Follower of long hinge pin 25 Guide member 28 Sliding guide groove 28a Guide groove of short hinge pin 28b Guide groove of long hinge pin 31 Partition wall 32 Convex rail 33 Elastic lip Piece 35 concave rail 36 elastic arm 37 taper projection 39 support hole for short hinge pin 40 support hole for long hinge pin 41 rib wall

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int.Cl. ⁷ , DB name) E05D 15/50 B60R 7/04 E05D 7/10

Claims (4)

(57) [Claims] 1. A lid opening / closing device comprising an operation button for opening and closing a lid, and a hinge pin which moves in and out of a shaft hole provided in a box body in conjunction with the operation button, and guides the movement of the hinge pin. Providing an independent guide member,
The independent guide member has a sliding guide groove having a rectangular cross section and an upper and a lower part opened, and the hinge pin includes:
The sliding guide groove has a section having a rectangular cross section to be fitted into the sliding guide groove, and is provided on one of the opposing inner side surface in the middle of the upper and lower opening portions of the sliding guide groove or the opposing outer side surface of the portion having the cross section rectangular shape of the hinge pin. A lid opening and closing device, wherein a pair of convex rails is formed, and a pair of concave rails engaging with each of the convex rails is formed on the other. 2. The independent guide member has a sliding guide groove having a rectangular cross section for fitting the inner end of the hinge pin, and a pair of convex rails is formed on an opposed inner side surface defining the sliding guide groove. The hinge pin is formed with a pair of concave rails engaging with the respective convex rails on opposing outer surfaces of an inner end having a rectangular cross section, and an elastic arm extending from the inner end to extend the elastic arm. 2. The lid opening / closing device according to claim 1, wherein a tapered projection elastically contacting the pair of convex rail edges is formed on a lower surface of the lid. 3. A pair of elastic lip pieces extending outward from an opening edge of a sliding guide groove into which a hinge pin is fitted,
3. The lid opening / closing device according to claim 1, wherein a tip of each of the elastic lip pieces is elastically contacted with a side surface of the hinge pin. 4. The hinge pin according to claim 1, wherein a rib wall abutting on a central portion of the hinge pin is provided on the lid substrate, and the hinge pin is bent by the rib wall. Lid opening and closing device.