JPH09317309A - Lid opening and closing device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a lid opening and closing device capable of effectively controlling the shakiness of hinge pins by providing an independent guide member. SOLUTION: The lid opening and closing device is equipped with controlling buttons 17A/17B for handling the opening and closing of the lid L and hinge pins 23/24 going in and out from axial holes provided in a box main body by interlocking with the controlling buttons 17A/17B. In that case, an independent guide member 25 for guiding going and out motion of the hinge pins 23/24 is provided. By the constitution, the unprepared shakiness of the hinge pins 23/24 making going in and out motion can be effectively controlled.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a lid opening / closing device which is rotatably attached to openings of various box bodies including lids of automobile console boxes.

[0002]

2. Description of the Related Art Whether a device for opening and closing a lid of an automobile console box from one direction or a device for opening and closing the lid from two directions is usually provided with an operation button for opening and closing the lid. The lid is opened and closed by disposing an interlocking hinge pin and allowing the hinge pin to project into and retract from a shaft hole provided at the opening edge of the box body.

[0003]

However, under the conventional opening / closing device, basically, whether the lid is opened or closed from one direction or the lid is opened or 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 side of the component 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. A structure is adopted in which the outer end portion of the hinge pin is supported and retracted in the shaft hole of the box body by supporting and obtaining the action of the cam groove.

For this reason, it goes without saying that in the conventional opening / closing device, the support of the hinge pin becomes unstable by itself, but in particular, the longer the hinge pin is, the more likely it is that the hinge pin moves in and out. This causes a big problem that the hinge pin is inadvertently rattled.

[0005]

The present invention was developed in order to effectively solve the problems of the conventional opening and closing device. The invention according to claim 1 is an operation for opening and closing the lid. In a lid opening / closing device including a button and a hinge pin that moves in and out of a shaft hole provided in the box body in conjunction with the operation button, a structure is provided in which an independent guide member that guides the retracting movement of the hinge pin is provided.

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, and the hinge pin has a cross section fitted into the sliding guide groove. A pair of convex rails are formed on either one of the opposing inner side surfaces defining the sliding guide groove or the opposing outer side surface of the hinge pin portion having the rectangular cross section, and each of the convex rails is formed on the other side. We adopted a configuration that forms a pair of concave rails that engage with.

According to a third aspect of the present invention, based on the first aspect, the independent guide member has a sliding guide groove having a square cross section into which the inner end portion of the hinge pin is fitted, and the sliding guide groove is provided. The pair of convex rails are formed on the inner side surfaces facing each other, and the hinge pin forms a pair of concave rails engaging with the respective convex rails on the outer side surfaces facing each other of the inner end having a square cross section. A structure is adopted in which an elastic arm is extended to the edge and a taper projection that elastically contacts the pair of convex rail edges is formed on the lower surface of the elastic arm.

According to a fourth aspect of the invention, on the premise of the second to third 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 structure is adopted in which the tip of each elastic lip piece is elastically contacted with the hinge pin.

According to a fifth aspect of the present invention, on the premise of the second to fourth aspects, the sliding guide groove into which the hinge pin is fitted has an upper portion and a lower portion opened.

According to a sixth aspect of the present invention, based on the first to fifth aspects, a rib wall that abuts a central portion of the hinge pin is provided so as to project, and the hinge pin is bent by the rib wall.

Therefore, according to the present invention, in the first aspect, since the independent guide member guides the retracting movement of the hinge pin, the rattling of the hinge pin is effectively suppressed as compared with the conventional device. it can.

According to the second and third aspects of the present invention, the engagement state of the pair of convex rails and the pair of concave rails is obtained, and the retracting movement of the hinge pin is guided in the sliding guide groove. The accuracy of 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 becomes easy. . Claim 3
In addition to this, in addition to this, the tapered projection of the elastic arm is elastically contacted with the pair of convex rail edges, which also suppresses further rattling, and also makes the hinge pin the centering position in the sliding guide groove. Can be automatically activated.

According to a fourth aspect of the present invention, since the tips of the pair of elastic lip pieces are elastically brought into contact with the hinge pin, rattling of the hinge pin can be suppressed. With the lower part opened, the necessary clearance is secured and the hinge pin retracts and retracts regardless of the presence or absence of burrs on the part of the hinge pin that has a square cross section or on the upper and lower parting lines at the inner end of the hinge pin. According to the sixth aspect, the hinge pin can be synergistically prevented from rattling in cooperation with the independent guide member because the center portion of the hinge pin is bent.

[0014]

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, the present invention will be described in detail based on the preferred embodiments shown in the drawings. The opening / closing device according to the embodiments is a device for opening / closing a lid of an automobile console box from two directions. Although it was developed, the feature is that the following configuration is adopted.

Therefore, first, from the main body side of the console box, in the present embodiment, as shown in FIG. 1, standing walls 1 are provided in front of and behind the opening edge of the box body B, and the standing walls 1 are provided. Axial holes 3 are provided at both ends with respect to the facing surface of the wall 1.
The metal brackets 2 formed with are fixed individually.

On the other hand, the lid L side which is rotatably attached to the opening of the box body B will be described later on the front side of the rectangular substrate 4 formed of synthetic resin as shown in FIG. 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 at a substantially central portion of the area 5 and moved into the holding block 6. The compression coil spring 7 that constantly urges the body 16 to the centering position is housed.

A beak-shaped check lever 8 is rotatably supported by a support wall 9 near one side of the holding block 6, and one end 8a of the check lever 8 is directed toward the holding block 6. Until the other end portion 8b faces the outside from the inside of the window 10 opened on the front wall side of the substrate 4 and the other end portion 8b abuts on the bottom portion of the window 10. The one end portion 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 area 5, a guide cam 12 for guiding the movement of a pair of bent tip portions 20a of a spring bar 20 described later.
Shall be provided symmetrically. The symmetrical guide cam 12 defines the forward path and the return path of each of the bent front end portions 20a via the reversing protrusions 14, and at least a guide wall 15 is provided on the return path side.

As shown in FIG. 3, the moving body 16 described above is an integrally molded product of synthetic resin having a narrow middle portion and wide end portions. A pair of left and right operation buttons 17A and 17B are integrally connected to each other, and a stopper protrusion 18 is formed on a side surface facing the check lever 8 in the narrow intermediate portion, and faces the guide cam 12 in the intermediate portion. A holder wall 19 is integrally formed on a side surface, and the pair of bent front end portions 20a is formed on the holder wall 19.
The spring bar 20 having the structure is fixed. Further, on both sides of the intermediate portion near both ends, a collar portion 16a for locking temporary assembly elastic claws 30 of a guide member 25, which will be described later, is provided.
Is formed.

In addition to this, a pair of leg pieces 21 which interfere with the compression coil spring 7 through the respective guide openings 6a of the holding block 6 are formed in the center of the lower surface of the intermediate portion, and are wide. A pair of cam grooves 22 having a restricting portion 22a and a non-restricting portion 22b are formed to face each other at both ends. The relationship between the restricting portion 22a and the non-restricting portion 22b of each cam groove 22 is as follows.
In the state in which the
The a-shapes are in the shape of an inverted V with the gap width gradually narrowed, and the non-regulating portions 22b are set in parallel with the same maximum gap width.

The movable body 16 has a pair of long and short hinge pins 23, 2 existing on each side in the opposed cam grooves 22.
Although the followers 23a and 24a of No. 4 are fitted in the area 5 of the substrate 4 described above so as to be movable in the left-right direction, the movable body 16 is provided on both sides of the area 5 of the substrate 4. Mounted on the two guide members 25 and two decorative frames 38, which are present on each side of the long and short hinge pins 23.
In the case of 4, the two guide members 25 guide the projecting / retracting movement thereof.

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

In particular, with respect to the sliding guide groove 28, as shown in the drawing, a rectangular cross-sectional shape is positively imparted, and a guide groove portion 28a for the short hinge pin 23 whose both upper and lower sides are opened, and a long dimension. Guide groove 28b for the hinge pin 24
And a partition wall 31 for partitioning the guide grooves 28a.
-A pair of convex rails 32 that engage with a later-described concave rail 35 is formed on each of the opposing inner side surfaces that define 28b, and a pair of elastic lips is formed on each of the opening edges of both ends of each of the guide groove portions 28a and 28b. While extending the piece 33 outwardly in a state where the tip side is narrowed, each of the guide groove portions 28a
A posture holding piece 34 that abuts on the surface of the substrate 4 is vertically provided below b.

On the other hand, the long and short hinge pins 23, 2 fitted in the respective guide groove portions 28a, 28b of the guide member 25.
Regarding No. 4, as shown in FIG. 5, the inner end of each of the guide grooves 28a and 28b has an angular cross section similar to the angular cross section of the guide grooves 28a and 28b. A pair of concave rails 35 that engage with the pair of convex rails 32 are formed on the side surface, and an elastic arm 36 is extended to the upper edge of the inner end, and a pair of convex rails 32 is provided on the lower surface of the tip of the elastic arm 36. The structure is such that a tapered projection 37 that elastically contacts the edge is formed.

Therefore, the guide groove 28 of the guide member 25
The inner end portions of the long and short hinge pins 23 and 24 are fitted in the a and 28b, and the followers 23a of the hinge pins 23 and 24 are inserted.
While fitting 24 a into the cam groove 22, both end portions and the intermediate portion of the moving body 16 are provided in the corresponding cavities 26 of the guide member 25.
When the elastic claws 30 for temporary assembly are engaged with the flanges 16a at the intermediate portions when pushed into 27, the moving body 16 and the long / short hinge pin 2 are thus guided relative to the guide member 25 on each side.
3/24 can be temporarily assembled at the same time.

Therefore, after that, each guide member 25 is attached to the substrate 4.
If screws are attached to both sides of the guide member 25,
Is fixed to the base plate 4, and at the same time, the moving body 16 is movably mounted in the area 5, and the long and short hinge pins 23.
4 will be movably supported in the corresponding guide groove portions 28a and 28b.

Moreover, in such a state, as shown in FIG. 6, the long and short hinge pins 23 and 24 are connected to the pair of convex rails 32.
Since the concave rails 35 of the pair and the pair of concave rails 35 are engaged and supported in the corresponding guide groove portions 28a and 28b, the guide groove portions 28a and 28 are not limited to the left and right direction, but in particular, the guide groove portions 28a and
The rattling in the vertical direction within 8b can be suppressed, and the hinge pins 23 and 24 of the pair of elastic lip pieces 33 are also provided.
Of the elastic arm 36 and the taper projection 37 of the elastic arm 36
With the elastic contact with the edge of each convex rail 32, the rattling is further effectively suppressed.

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

In addition, the fact that the tapered projection 37 of the elastic arm 36 makes elastic contact with the edge of each convex rail 32 is coupled with the engagement of the convex rail 32 and the concave rail 35 described above, and thus the hinge pin 23.
Since it is possible to automatically urge 24 to the centering position in the guide grooves 28a and 28b, the guide grooves 28a and 28b of the guide member 25 and the hinge pins 23 and 24 are formed.
The accuracy of the positional relationship is improved, and even if the hinge pins 23 and 24 are twisted, the twisting can be effectively suppressed and the positional relationship between the two can be maintained in an ideal state.

Then, when one of the operation buttons 17A or 17B integrally connected to the moving body 16 is pushed inward, a pair of long and short hinge pins 23 on the pushing side are present.
Numeral 24 obtains the guiding action of the above-mentioned guide groove portions 28a and 28b including elastic contact of the pair of elastic lip pieces 33, and the action of the restricting portion 22a having the C-shape of the opposing cam groove 22 causes them to approach each other. However, the pair of long and short hinge pins 23 and 24 on the opposite side do not move in the directions in which they approach each other due to the action of the non-restricting portion 22b having the parallel shape of the opposing cam grooves 22. Absent.

In the figure, 39 is a support hole for supporting the outer end portion of the short hinge pin 23 on each side, which corresponds to the shaft hole 3 of the front bracket 2 described above and the front wall of the substrate 4. On the contrary, 40 is a supporting hole for supporting the rear end portion of the long hinge pin 24 existing on each side, which corresponds to the axial hole 3 of the rear bracket 2 and both sides of the rear wall of the substrate 4. Is formed in. Reference numeral 41 denotes a plurality of rib walls provided near the rear portion of the substrate 4, abutting on the central portion of the long hinge pin 24 present on each side to bend the long hinge pin 24 slightly outward. By utilizing the reaction force, the rattling of the hinge pin 24 is eliminated and the occurrence of chattering noise is prevented without using a non-woven fabric or the like.

Therefore, under 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 through the guide member 25 described above, By covering the cover 4 with an appropriate cover body 42, the lid L can be assembled very easily, and thereafter, by pressing the integrated operation buttons 17A and 17B, which have already been described, or the like, each side can be pressed. Existing pair of long and short hinge pins 23.2
By engaging the outer ends of 4 into the corresponding shaft holes 3 of the front and rear bracket 2, the lid L can be rotatably attached to the box body B side as in the conventional case. .

When the lid L is closed, as shown in FIG. 7, the moving body 16 in which the operation buttons 17A and 17B are integrally connected is housed in the holding block 6 and compressed. Due to the spring pressure of the coil spring 7, the area 5 of the substrate 4
Since it is urged to its centering position inside, the rear ends of the pair of long and short hinge pins 23 and 24 present on each side go into the corresponding shaft holes 3 of the front and rear bracket 2 via their respective support holes 39 and 40. Engagement ensures a secure blockage.

In this closed state, the followers 23a. Of the pair of long and short hinge pins 23.
As shown in the figure, 24a is located at the boundary between the restricting portion 22a and the non-restricting portion 22b of the opposing cam groove 22, while the other end 8b of the check lever 8 contacts the upper edge of the front bracket 2 of the box body B. Since the one end 8a of the moving body 16 is pressed downward against the spring pressure of the torsion spring 11, the stopper projection 18 of the moving body 16 is positioned above the one end 8a of the check lever 8. It is only located. or,
Each bent tip portion 20a of the spring bar 20 stands by at the neutral position of the corresponding guide cam 12.

When the lid L is rotated leftward in order to open the opening of the box body B in the closed state of the lid L, the right operation button 17A is set 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 that interlocks with the movement of the moving body 16
The pair of long and short hinge pins 23 and 24 on the right side are reliably guided by the respective guide groove portions 28a and 28b of the guide member 25 by the action of the restriction portion 22a of No. 2, and the front and rear brackets 2 do not inadvertently rattle. It comes off from each shaft hole 3 of. Since the long hinge pin 24 is further subjected to the abutting action of the rib wall 41, the rattling suppression thereof becomes more effective.

When the operation button 17A is pressed, the bent tip portion 20a located on the left side of the spring bar 20 is interlocked with the moving body 16 to reverse the forward path of the corresponding guide cam 12 to the inversion protrusion 14a. However, when the bent tip portion 20a goes over the reversing protrusion 14 and moves to the inlet side of the return path, the pressing load on the operation button 17A changes and at the same time, a pleasant sound called a rattle is generated. The bent tip portion 20a located on the right side of the spring bar 20 merely moves to the left from its neutral position without performing any action, as shown in the drawing.

Further, when the right operation button 17A is pushed inward, as shown in the figure, the operation button 17A is pressed.
Naturally, the moving body 16 integrated with the same also moves in the same direction together with the left operation button 17B, but at this time, the sliding contact action of the guide protrusion portion 29 of the guide member 25 on each side. So, the movement will be surely guided, so
The moving body 16 also does not have to worry about rattling.

Therefore, when the lid L is rotated slightly upward while the operation button 17A is being pressed, the check lever 8
Since the contact state of the other end portion 8b of the front side bracket 2 with the upper edge portion of the front side bracket 2 is immediately released, the one end portion 8a of the check lever 8 is rotated upward by the spring pressure of the torsion spring 11. , The stopper protrusion 18 of the moving body 16 on its own side
Automatically abut.

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

Accordingly, after that, if the lid L is rotated to the left 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 as the rotation axes, FIG. As shown in, the opening of the box body B can be opened. Moreover, the operation of opening the lid L is performed by the operation button 17
After rotating the lid L slightly while pressing A,
There is no concern that the moving body 16 will return to the original centering position together with the operation button 17A even if the hand is released.
The rotating operation of is convenient. Further, in this state, even if the operation button 17B on the left side is accidentally pressed, the pressing operation can also be prevented by the abutment of the stopper projection 18 on the one end portion 8a of the check lever 8.

When the lid L in the fully opened state is closed, the lid L is inserted into the shaft hole 3 of the front and rear bracket 2 on the left side.
When the lid L is tilted until it abuts against 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. Check lever 8 by contacting the upper edge of front bracket 2
Since the one end 8a side of the compression spring 7 is pressed downward against the spring pressure of the torsion spring 11 to release the contact state of the stopper protrusion 18 with respect to the side surface of the torsion spring 11, the moving body 16 moves the compression coil spring 7 At the same time as it returns to the centering position by the spring pressure, the pair of long and short hinge pins 23 and 24 on the right side are also interlocked with the centering position by the action of the restricting portion 22a of the cam groove 22 to move from the respective support holes 39 and 40. The lid L is closed by automatically engaging the corresponding axial holes 3 of the front and rear brackets 2.

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

On the contrary, when the lid L is rotated rightward to open the opening of the box body B, although not specifically shown, this time, the left operation button 17B is held in the holding block. By pressing inward against the spring pressure of the compression coil spring 7 in 6, the same operation as above is performed,
Also, when closing the lid L in the fully opened state,
The same operation as described above will be performed. Even in this case, the long and short hinge pins 23 and 24 on the left side are
Each guide groove portion 28a, 28b of the independent guide member 25
It is needless to say that the hinge pins 23 and 24 can be effectively prevented from being unintentionally rattled as well since they are reliably guided by.

In the above embodiment, the convex rail 32 is formed on the guide groove portions 28a and 28b side, and the concave rail 35 is formed on the inner end side of the hinge pins 23 and 24. The present invention is not limited to this,
Conversely, the concave rail 35 is formed on the guide groove portions 28a and 28b side, and the convex rail 32 is formed on the inner end side of the hinge pins 23 and 24.
It is also optional to form the above according to the implementation.

[0045]

As described above, according to the present invention, by adopting the above-mentioned structure, under the first claim, the independent guide member guides the retracting movement of the hinge pin. The rattling of the hinge pin can be effectively suppressed, and under the second and third aspects, the engagement state of the pair of convex rails and the pair of concave rails is obtained, and the retracting movement of the hinge pin is made within the sliding guide groove. Since the guide is performed, the accuracy in the positional relationship between the sliding guide groove of the guide member 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. Assembling work becomes easy. In addition, according to claim 3, in addition to this, since the taper projection of the elastic arm is elastically contacted with the pair of convex rail edges, further rattling can be suppressed also by this, and the hinge pin can be slid in the guide groove. It is possible to automatically bias the inside centering position.

Further, according to claim 4, since the tips of the pair of elastic lip pieces are elastically contacted with the hinge pin, rattling of the hinge pin can be suppressed, and according to claim 5, the upper part of the sliding guide groove is provided. Since the lower part of the hinge pin is open, the necessary clearance is secured regardless of the presence or absence of burrs on the part of the hinge pin that has a square cross section or the upper and lower parting lines at the inner end of the hinge pin, and the hinge pin moves in and out. According to the sixth aspect, since the central portion of the hinge pin can be bent, the rattling of the hinge pin can be synergistically suppressed in combination with the guiding action of the independent guide member.

[Brief description of drawings]

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

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

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

FIG. 4A is a plan view of a guide member, and FIG.
FIG. 9 is a sectional view taken along line AA of FIG.

5A is a perspective view of a main part showing a structure on 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. Is.

FIG. 6 is a cross-sectional view of essential parts showing a state in which a hinge pin is fitted in a guide groove portion of a guide member.

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

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

FIG. 9 is a perspective view showing a state in which a lid is opened.

[Explanation of symbols]

 B Box body L Lid 3 Shaft hole 4 Substrate 5 Mounting area for moving body 8 Check lever 12 Guide cam 16 Moving body 17A Right operation button 17B Left operation button 18 Stopper protrusion 19 Holder wall 20 Spring bar 22 Cam groove 23 Short size Hinge pin 23a Short hinge pin follower 24 Long hinge pin 24a Long hinge pin follower 25 Guide member 28 Sliding guide groove 28a Short hinge pin guide groove 28b Long hinge pin guide groove 31 Partition wall 32 Convex rail 33 Elastic lip Piece 35 Concave rail 36 Elastic arm 37 Tapered protrusion 39 Support hole for short hinge pin 40 Support hole for long hinge pin 41 Rib wall

Claims (6)

[Claims] 1. A lid opening / closing device including an operation button for opening and closing a lid, and a hinge pin that appears in and out of a shaft hole provided in the box body in conjunction with the operation button, and guides the movement of the hinge pin. An opening / closing device for a lid, which is provided with an independent guide member. 2. The independent guide member has a sliding guide groove having a rectangular cross section, and the hinge pin has a portion having a rectangular cross section fitted into the sliding guide groove, and the sliding guide groove has a rectangular cross section. A pair of convex rails is formed on either one of the opposing inner side surfaces or the opposing outer side surface of the portion having a rectangular cross section of the hinge pin, and a pair of concave rails engaging with each convex rail is formed on the other side. The lid opening / closing device according to claim 1. 3. The independent guide member has a sliding guide groove having a rectangular cross section into which the inner end portion of the hinge pin is fitted, and a pair of convex rails are formed on the opposing inner side surfaces defining the sliding guide groove. The hinge pin is formed with a pair of concave rails that engage with the respective convex rails on the opposing outer surfaces of the inner end portion having a rectangular cross section, and at the inner end edge, an elastic arm is extended to form the elastic arm. The lid opening / closing device according to claim 1, wherein a taper projection that elastically contacts the pair of convex rail edges is formed on the lower surface of the lid. 4. A pair of elastic lip pieces extending outward at the opening edge of the sliding guide groove into which the hinge pin is fitted,
The lid opening / closing device according to claim 2, wherein a tip of each of the elastic lip pieces is elastically contacted with a hinge pin. 5. The sliding guide groove into which the hinge pin is fitted,
The upper portion and the lower portion are open, and
5. The lid opening / closing device according to claim 4. 6. The lid opening / closing device according to claim 1, wherein a rib wall is provided so as to abut on a central portion of the hinge pin, and the hinge pin is bent by the rib wall.