JPH0958266A - Opening/closing structure of lid - Google Patents

Abstract

PROBLEM TO BE SOLVED: To smoothly operate to open/close a lid and surely hold it at opening and closing conditions by providing a housing of a resin molding and a lid combining through a hinge, and elastically contacting the irregular cam face of a cam piece provided on the lid with the elastic part sandwiched with slits provided on the housing. SOLUTION: When this opening/closing structure of a lid is applied for a vanity mirror unit provided on a sun visor for vehicle, bearing parts are provided on both sides of the upper part of a housing 20, and hinge pins 31 projecting on both sides of the rotational supporting shaft of a lid 30 are rotatably supported with the bearing parts. A cam piece 32 is integratedly formed a little inside the hinge pins 31, and irregular cam faces 32a-32c are formed on the outer surface of the cam piece 32. Further a groove part 23 is formed on the upper edge of the housing 20 so as to receive the cam piece 32, and slits 24 are formed on the upper and lower positions of the bottom face 23a of the groove part 23, so as to form an elastic part 25 between the slits 24. By cooperation of the elastic part 25 and the irregular cam faces 32a-32c, the lid 3 is held at opening and closing conditions.

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 structure which is attached to a housing made of a resin molded body so as to be openable / closable. It relates to the lid opening and closing structure that can be set.

[0002]

2. Description of the Related Art Heretofore, parts having a housing made of a resin molded body and an opening / closing lid attached to the housing have been widely used for consumer equipment, interior parts for automobiles and the like. As a conventional example, as shown in Japanese Utility Model Publication No. 6-50924, there is a cover part opening / closing structure of a vanity mirror attached to a sun visor of a vehicle.

As shown in FIG. 11, the main body 2 of the vanity mirror 1 is made of synthetic resin, and a mirror 3 is fixed to the main body 2 as well as the main body 2. It is configured to cover the mirror 3 when the cover portion 4 formed of the same material is closed.

As shown in FIGS. 12 (a) and 12 (b), the cover portion 4 has an opening / closing structure in which a cam portion 5 formed integrally with the cover portion 2 and the cam portion 5 are covered by the cover portion 4. It is composed of an abutting piece 7 having an elastic force integrally formed with the main body portion 2 which abuts when the shaft 6 is rotated around the shaft 6 with opening and closing.

Therefore, the closed state of the cover 4 is shown in FIG.
As shown in (a), the close holding surface 5A of the cam portion 5 and the contact piece 7 are in contact with each other, so that the closed state of the cover portion 4 can be maintained, and as shown in FIG. In the open state of the portion 4, the open holding surface 5B of the cam portion 5 and the contact piece 7 contact each other, whereby the open state of the cover portion 4 is maintained.

[0006]

However, in the opening / closing structure of the cover portion 4 described above, the closed holding surface 5A and the open holding surface 5B of the cam portion 5 formed integrally with the cover portion 4 have the upper end of the main body portion 2. Since the contact piece 7 is elastically contacted with the contact piece 7 whose edge is bent, the contact piece 7 is provided integrally with the main body portion 2, so that the cam portion 5 has high rigidity and poor flexibility. The resistance when rotating is excessively likely to be excessive, and in some cases, the cover 4 may be damaged when opening and closing.

Therefore, there is a drawback in that it is very difficult to design the shape of the cam portion 5 in order to perform a smooth opening / closing operation, and the operability is affected by product variations.

The present invention has been made in view of the above circumstances, and is an opening / closing structure of a lid which is openably / closably supported by a housing made of a resin molded body, and has an arbitrary click action force when opening / closing the lid. It is an object of the present invention to provide a lid opening / closing structure that can be adjusted and can be expected to perform a smooth lid opening / closing operation, is not damaged by the lid opening / closing operation, and has improved durability.

[0009]

In order to achieve the above object, the present invention provides a lid opening / closing structure which is openably / closably supported by a housing made of a resin molded body through a hinge mechanism. A cam piece having a deformed cam surface is integrally formed on the hinge-side end edge, and an elastic portion sandwiched by a pair of slits is set on the housing side corresponding to this cam piece. It is characterized in that the deformed cam surface of one piece elastically contacts the elastic portion to maintain the respective states when the lid is opened and closed.

Here, the hinge mechanism may be, for example, a structure in which hinge pins are formed on both sides of the lid so as to project outward, and the hinge pins are rotatably supported by a bearing portion of the housing. It is also possible to provide hinge pins with the tips facing inward on both sides and set bearing portions for bearing the hinge pins on both sides of the lid.

Further, the cam piece formed on the lid is provided with a deformed cam surface, a groove portion for accommodating the cam piece is formed on the housing side, and the elastic piece is elastically contacted with the deformed cam surface of the cam piece at any time. The part is formed between the pair of slits.

As the slit forming the elastic portion,
The pair of slits may be provided along the axial direction of the rotation axis of the lid, or may be provided in a direction orthogonal to the axial direction of the rotation axis of the lid.

Further, the elastic portion may be provided so as to project toward the cam piece side, and in order to secure a reliable engaging force between the cam piece of the lid and the elastic portion of the housing, a protrusion or an elastic member is formed on the cam piece. It is also possible to provide a recess in the portion and use the engaging action of the protrusion and the recess.

As is apparent from the above structure, when the lid is opened or closed, the deformed cam surface of the cam piece provided integrally with the lid comes into contact with the elastic contact portion of the housing, and the lid is opened and closed by an appropriate click action. The condition can be kept good.

Further, the elastic force of the elastic portion can be arbitrarily adjusted by the length and width of the slit.

Further, since the elastic portion provided in the housing gives an elastic force by being sandwiched by the slit, there is a trouble such as breakage as compared with the conventional type in which the elastic portion is bent at a substantially right angle. Does not happen.

[0017]

BEST MODE FOR CARRYING OUT THE INVENTION An embodiment of a lid opening / closing structure according to the present invention will be described in detail below with reference to the accompanying drawings.

FIG. 1 is a perspective view in which the present invention is applied to a vanity mirror unit installed in a vehicle sun visor, FIG. 2 is a sectional view showing the structure of the vanity mirror unit, and FIG. 3 is provided in a housing of the mirror unit. FIG. 4 is a plan view showing the elastic portion, FIG. 4 is a cross-sectional view showing the closed state of the lid in the vanity mirror unit, and FIGS. 5 to 10 are views showing different embodiments of the elastic portion in the lid opening / closing structure according to the present invention. It is a sectional view and a perspective view.

In FIG. 1, this vanity mirror unit 10 is mounted on a sun visor on the auxiliary seat side installed in a vehicle.
It is composed of a housing 20 made of an injection-molded body of a synthetic resin such as polypropylene resin or ABS resin, and a lid 30 made of a resin-molded body that can be opened and closed with respect to the housing 20.

More specifically, the vanity mirror 21 is fixed to the substantially central portion of the surface of the housing 20, and the bearing portions 22 are installed on both sides of the upper portion of the housing 20, so that both sides of the lid 30 on the rotation support shaft side are provided. A hinge pin 31 protruding outward is rotatably supported by the bearing portion 22.

A cam piece 32 is integrally formed on the inner side of the hinge pin 31 installed on the lid 30, and the outer surfaces of the cam piece 32 are deformed cam surfaces 32a and 32b as shown in FIG. , 32c are formed.

A groove portion 2 is formed on the upper edge of the housing 20 so as to accommodate the cam piece 32 formed on the lid 30.
3 is formed, and as shown in FIGS. 2 and 3, the groove portion 2 is formed.
A pair of upper and lower slits 24 are formed on the flat bottom surface 23 a of the sheet 3, and an elastic portion 25 is formed between the slits 24.

Then, the deformed cam surfaces 32a, 32b, 3 of the elastic portion 25 of the housing 20 and the cam piece 32 of the lid 30 are formed.
By elastically contacting the lid 30 with the lid 2c, the lid 30 can be opened and closed with an appropriate click action, and the open state and the closed state of the lid 30 can be surely held.

That is, the state shown in FIGS. 1 and 2 shows the opened state of the lid 30, and at this time, the deformed cam surface 32a, which is also substantially flat, contacts the flat elastic portion 25. As a result, the open state of the lid 30 can be maintained by the engagement force between the cam piece 32 and the elastic portion 25 of the housing 20.

In order to change the lid 30 from the open state to the closed state, the lid 30 is pushed down, and the deformed cam surface 32b forming the curved surface of the cam piece 32 formed integrally with the lid 30 is housed. When the lid 30 is elastically contacted with the elastic portion 25 of the 20 to perform the closing operation of the lid 30 with a proper resistance force, and the lid 30 shown in FIG. The deformed cam surface 32c engages with the elastic portion 25 of the housing 20 to securely maintain the closed state of the lid 30.

As described above, according to the opening / closing structure of the lid 30 of the present invention, the elastic portion 25 sandwiched between the slits 24 is provided.
By setting, there is no possibility of causing damage as in a bent contact piece as in the conventional case, durability is improved, and particularly, by adjusting the slit width or slit length of the slit 24, etc. The elastic force between the elastic portion 25 and the cam piece 32 of the lid 30 can be adjusted with high precision, and the molding variations of the housing 20 and the lid 30 can be effectively absorbed.

Next, FIGS. 5 to 10 show a modified example of the embodiment of the present invention, and FIGS. 5 and 6 are sectional views showing the opened and closed states of the lid 30, respectively. Flat deformed cam surfaces 32a, 32 at 32
The protrusions 33a and 33b are formed on c.
The elastic portion 25 is provided with a recess 2 so as to engage with 3a and 33b.
6 is recessed.

Therefore, when the lid 30 is opened, as shown in FIG. 5, the deformed cam surface 32a of the lid 30 is deformed.
By engaging the protrusion 33a provided in the recess 26 with the recess 26 provided in the elastic portion 25 of the housing 20, the open position of the lid 30 can be more firmly maintained.

On the other hand, when the lid 30 is closed, as shown in FIG.
As shown in FIG. 5, the protrusion 33b provided on the deformed cam surface 32c of the lid 30 similarly engages with the recess 26 of the elastic portion 25, so that the closed posture of the lid 30 can be more firmly maintained.

Furthermore, since both the lid 30 and the housing 20 are made of a synthetic resin injection molded body, the protrusions 33a and 33b and the recess 26 can be easily integrally molded.

Next, as shown in FIG. 7, the elastic portion 25 sandwiched between the slits 24 has a bottom surface 23a of the groove portion 23 and a step portion 27.
By forming the elastic member 25 through the through hole, the flexibility of the elastic portion 25 can be strengthened, and the click action force of the lid 30 can be easily controlled by adjusting the height of the step portion 27.

FIG. 8 shows an embodiment in which the bending portion 28 is formed inside the step portion 27 described above.

Similarly, in FIG. 9, the slit 24 is set in the vertical direction. In this case, the length of the slit 24 can be made large, and the cam piece 32 of the lid 30 and the elastic portion 25 of the housing 20 can be made larger. You can strengthen the elasticity, lid 3
The open and closed state of 0 can be maintained more firmly.

Further, as shown in FIG. 10, the elastic portion 25 may be set in a curved shape to enhance the flexibility of the elastic portion 25.

In each of the above-described embodiments, the cam pieces 32 are integrally molded on both sides of the hinge-side end edge of the lid 30,
Elastic part 25 sandwiched by the slit 24 on the housing 20 side
This is also formed on the left and right sides, but as another embodiment, the cam piece 32 is installed only on one of the left and right sides of the lid 30 or in the central portion, and only one elastic portion 25 is provided on the housing 20 side. You may make it correspond with.

Although the embodiment described above is applied to the lid opening / closing structure in the vanity mirror unit of the vehicle sun visor, the present invention is not limited to this.
The application of the lid is not particularly limited as long as it is an opening / closing structure of a lid installed in a housing made of a resin molded body.

[0037]

As described above, the lid opening / closing structure according to the present invention has the following special operational effects.

(1) The lid opening / closing structure according to the present invention is
The lid body is composed of a housing made of a resin molded body and an openable / closable lid hingedly coupled, and the deformed cam surface of the cam piece provided on the lid and the elastic portion sandwiched by the slit provided on the housing are elastically contacted to each other. Smooth opening and closing operation of
In addition, since the lid is held securely when it is opened and closed, the opening and closing force of the lid can be adjusted and the variations in the molded product can be absorbed by appropriately changing the slit length and width. It becomes possible to
This has the effect of enabling smooth opening and closing of the lid.

(2) The lid opening / closing structure according to the present invention is
Since a substantially flat elastic part set between the slits in the housing and a cam piece elastically resilient to this elastic part are installed on the lid side, it is bent about 90 ° by abutting on the tip of the housing as in the conventional case. It is not formed, and the contact piece is not damaged, and the durability is improved.

[Brief description of drawings]

FIG. 1 is a perspective view of a vanity mirror unit showing an embodiment of a lid opening / closing structure according to the present invention.

FIG. 2 is a cross-sectional view showing an open state of a lid in the vanity mirror unit shown in FIG.

FIG. 3 is a plan view showing an elastic portion formed in the housing shown in FIG.

4 is a cross-sectional view showing a closed state of a lid in the vanity mirror unit shown in FIG.

FIG. 5 shows another embodiment of the lid opening / closing structure according to the present invention, and is a cross-sectional view showing an opened state of the lid.

FIG. 6 shows another embodiment of the lid opening / closing structure according to the present invention, and is a cross-sectional view showing a closed state of the lid.

FIG. 7 is a perspective view showing another embodiment of the elastic portion in the lid opening / closing structure according to the present invention.

FIG. 8 is a perspective view showing another embodiment of the elastic portion in the lid opening / closing structure according to the present invention.

FIG. 9 is a perspective view showing another embodiment of the elastic portion in the lid opening / closing structure according to the present invention.

FIG. 10 is a perspective view showing another embodiment of the elastic portion in the lid opening / closing structure according to the present invention.

FIG. 11 is a perspective view showing a conventional vanity mirror unit.

FIG. 12 is a cross-sectional view showing an open / closed state of a lid in a conventional vanity mirror unit.

[Explanation of symbols]

 10 Vanity mirror unit 20 Housing 21 Vanity mirror 22 Bearing part 23 Groove part 24 Slit 25 Elastic part 30 Lid 31 Hinge pin 32 Cam pieces 32a, 32b, 32c Deformed cam surface

Claims (1)

[Claims] 1. A housing (20) made of a resin molding.
In the opening / closing structure of the lid (30) that is openably and closably supported via a hinge mechanism, a cam having deformed cam surfaces (32a, 32b, 32c) at the hinge-side edge of the lid (30). The piece (32) is integrally molded, and an elastic portion (25) sandwiched by a pair of slits (24) is set on the side of the housing (20) corresponding to the cam piece (32). When opening and closing, the deformed cam surfaces (32a, 32b, 3) of the cam piece (32)
The lid opening / closing structure is characterized in that the elastic portion (25) is elastically contacted with the elastic portion (25) so as to hold the lid (30) in the opened state and the closed state, respectively.