JP3139614B2 - Lid opening and closing structure - Google Patents

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 suitable for a vanity mirror unit or the like provided in a sun visor for an automobile.

[0002]

2. Description of the Related Art As shown in FIG. 14, for example, an automobile sun visor 1 having a sunshade function installed in front of an auxiliary seat of a passenger car has a front surface side of the sun visor 1 (use of a sun visor) to improve usability. In many cases, the vanity mirror unit 2 is employed on the side facing the occupant in the auxiliary seat).

[0003] The vanity mirror unit 2
Is the unit base 4 with the vanity mirror 3 attached
And attached to this unit base 4 so that it can be opened and closed,
And a lid 5 for covering or exposing the vanity mirror 3.

Further, as shown in FIG. 15, the lid 5 has an irregular cam surface so that the lid 5 can be held in the closed state and the open state when the vanity mirror 3 is not used and when the vanity mirror 3 is used. A cam piece 6 having a U-shaped spring 7 is provided at a position corresponding to the cam piece 6.
Is inserted, and the lid 5 is held in a good state by utilizing the elastic repulsive force of the U-shaped spring 7.

[0005]

As described above, in the conventional vanity mirror unit 2, the closed state of the opening / closing lid 5 is caused by the elastic contact between the cam piece 6 provided on the opening / closing lid 5 and the U-shaped spring 7. Although the open state is favorably held, the U-shaped spring 7 must be inserted from the insertion hole 4a of the unit base 4 with the legs of the U-shaped spring 7 bent inward. However, the work becomes extremely troublesome, which is a major factor that causes a reduction in workability.

When the space for accommodating the U-shaped spring 7 is taken into consideration, the thickness of this portion must be set large, and the thickness of the entire unit base 4 is restricted. There was a drawback that it was not possible to proceed.

Further, the rotation torque of the lid 5 is
It is desirable to set the rotation torque large so that the respective states can be securely maintained when the lid is closed and used, and to set a relatively small rotation torque small during the opening and closing operations of the lid 5. However, the conventional U-shaped spring 7 cannot control the rotation torque satisfactorily, and has also had a problem to improve the opening / closing operability of the lid 5.

The present invention has been made in view of such circumstances, and it is possible to improve the workability of inserting a spring into a unit base, promote the thinning of the unit, and apply a good rotating torque. It is an object of the present invention to provide a lid opening / closing structure that can be used.

[0009]

In order to achieve the above object, the present invention relates to a lid opening / closing structure which can be opened / closed by a hinge mechanism on a unit base made of a resin molded product. A cam piece having a deformed cam surface is integrally formed, and a leaf spring is provided at a position corresponding to the cam piece on a unit base side for accommodating the rotation support shaft side of the lid. In the spring
Has an elastic part that is in elastic contact with the lid cam piece
With the flat cam surface of the lid cam piece
The elastic part of the leaf spring becomes a two-sided
When making elastic contact with the curved cam surface of the cam piece of
The elastic portion of the spring is of a cantilever type .

Here, the hinge mechanism between the unit base and the lid may be such that hinge pins are set on both sides of the lid, and a bearing portion for rotatably bearing the hinge pins is set on the unit base side. On both sides of the unit base side, set hinge pins facing inward,
A bearing portion for bearing the hinge pin may be set on both sides of the lid.

The cam piece integrally formed with the lid is
The cam piece is integrally formed slightly inside the hinge pin, and the cam piece has a deformed cam surface formed on its surface.

On the other hand, the leaf spring installed on the unit base side is set as an elastic portion having one longitudinal end fixed to the unit base and the other end contacting the cam piece to apply a repulsive force to the cam piece. Have been.

That is, in order to make the other end an elastic portion, a step portion is formed so that the central portion of the leaf spring projects toward the unit base, or the step portion is provided on the unit base at the central portion of the leaf spring. It is conceivable that the other end side is brought into a free state by bringing the protrusion into contact.

[0014]

As is apparent from the above configuration, since the leaf spring is accommodated corresponding to the lid cam piece, the lid cam piece and the elastic portion provided on the other end side of the leaf spring elastically contact each other.
Since the deformed cam surface of the cam piece comes into contact with the elastic portion of the leaf spring by opening and closing the lid, the open and closed states of the lid can be reliably held by the spring effect of the leaf spring.

Furthermore, since a leaf spring which does not require much thickness is used in place of the conventional U-shaped spring, it can be easily mounted on the unit base side, and a space for accommodating the leaf spring can be reduced.

Further, if the elastic portion of the leaf spring can be alternately selected as a double-sided type or a cantilevered type in accordance with the deformed cam surface of the cam piece of the lid, a relatively light force is exerted during the rotation operation. , And the lid can be securely and firmly held in the closed and open states.

[0018]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Various embodiments in which a lid opening / closing structure according to the present invention is applied to a vanity mirror unit installed in an automobile sun visor will be described in detail with reference to the accompanying drawings.

FIG. 1 is a front view showing an automotive sun visor equipped with a vanity mirror unit to which the present invention is applied, FIG. 2 is a perspective view showing the vanity mirror unit, and FIGS. 3 to 6 are first embodiments of the present invention. 3 is a cross-sectional view showing a lid opening / closing structure, FIG. 4 is a perspective view showing a leaf spring used in the lid opening / closing structure shown in FIG. 3, and FIGS. 5 and 6 are lid closed and open states. It is each sectional drawing which shows a state, respectively.

FIGS. 7 and 8 show a modification of the first embodiment of the present invention. FIGS. 7A and 7B are perspective views showing leaf springs, and FIG. It is sectional drawing which shows the state which fixed the leaf spring shown to a) to the unit base.

FIGS. 9 to 12 show a second embodiment of the present invention. FIG. 9 is a sectional view showing an opening and closing structure of the lid, and FIG. 10 shows a leaf spring used in the opening and closing structure of the lid. 11 and 12 are cross-sectional views showing the closed state and the open state of the lid, respectively, and FIG. 13 is a cross-sectional view showing a further modified example.

First, a schematic configuration of the sun visor 10 for a vehicle and a vanity mirror unit will be briefly described with reference to FIGS.

In the drawings, reference numeral 10 denotes a sun visor for an automobile installed on an auxiliary seat side of a passenger car. The sun visor 10 is rotatable up and down around an axis of a rotation shaft 11, and Since the shaft 11 is rotatably inserted into the bracket 12 fixed to the vehicle body side, the shaft 11 for rotation can be rotated in the bracket 12 so that it can rotate in the left-right direction. The sun visor 10 is rotatable to an arbitrary position in the vertical and horizontal directions so that the sun visor 10 can be stored in the ceiling surface and shield the front window and the side windows.

The present invention is applied to a vanity mirror unit 20 installed in such a sun visor 10, and the vanity mirror unit 20 is made of a polypropylene resin or an ABS resin as shown in FIGS. Base 3 made of injection molded body of synthetic resin such as
0, a lid 4 that is attached to the unit base 30 so as to be openable and closable and covers the surface side of the vanity mirror 31.
It is roughly configured from 0.

More specifically, bearing portions 32 are provided on both upper sides of the unit base 30, and the bearing portions 32 are provided.
The hinge pins 41 provided on both sides of the lid 40 on the rotation axis side are inserted into the shaft holes, so that the lid 40 is supported on the unit base 30 so as to be openable and closable.

On the inner surface of the lid 40, a cam piece 42 is provided slightly inside the left and right hinge pins 41.
The cam piece 42 has deformed cam surfaces 42a, 42b, and 42c formed on the surface thereof, respectively.

The deformed cam surfaces 42a and 42c are substantially flat surfaces, and the remaining deformed cam surfaces 4 sandwiched between them are formed.
2b is set to a curved surface.

A groove is formed on the upper side of the unit base 30 so as to accommodate the edge of the lid 40 on the side of the rotation fulcrum.
3, a space 33 for accommodating the leaf spring 50 is set as shown in FIG.

FIGS. 3 and 4 show a first embodiment of the lid opening / closing structure according to the present invention. As shown in FIG. 4, a leaf spring 50 used in this embodiment is an elongated flat leaf spring. A step 51 is formed at the center of the base, one end in the longitudinal direction is a fixed part 52, and the other end is an elastic part 53 that abuts on the cam piece 42 of the lid 40. The terminal of the elastic part 53 is bent downward. It is formed as a flange 54.

Accordingly, the thickness of this leaf spring 50 is
Is the protrusion dimension of d in the figure.
Has been established.

As shown in FIG. 3, the leaf spring 50 is inserted into the accommodation space 33 through an insertion hole 34 formed in a vertical wall of the unit base 30, and as shown in FIG. The locking hole 55 of the fixing portion 52 is locked to the pin 35 for preventing falling off, so that the unit base 3
The leaf spring 50 is securely mounted and fixed in the zero accommodation space 33.

Then, a predetermined position of the cam piece 42 of the lid 40 attached to the unit base 30 elastically contacts the elastic portion 53 of the leaf spring 50. For example, as shown in FIG. In order to cover the vanity mirror 31 of the leaf spring 50, the cam piece 42 of the lid 40 is pressed against the surface of the elastic portion 53 of the leaf spring 50 by the substantially flat deformed cam surface 42 a, and the flange 5 of the leaf spring 50 is pressed.
Since the plate 4 is in contact with the bottom surface of the unit base 30, the leaf spring 50 is of a double-supported type, and a strong repulsive force from the leaf spring 50 acts on the deformed cam surface 42a to securely and firmly hold the lid 40 in the closed state. it can.

Next, as the lid 40 is opened, the curved deformed cam surface 42b of the lid 40 presses against the elastic portion 53 of the leaf spring 50. At this time, as shown in FIG. Is separated from the unit base 30, the leaf spring 50 is of a cantilever type, and the leaf spring 5
An ideal resilience from zero is obtained, and the lid 40 can be smoothly opened and closed.

Further, as shown in FIG. 6, when the lid 40 is set at an opening angle of about 90 °, the flat deformed cam surface 42c of the lid 40 presses the elastic portion 53 of the leaf spring 50, The flange 54 of the terminal 50 contacts the surface of the unit base 30, and the leaf spring 50 is of a double-supported type, and a strong repulsive force from the leaf spring 50 acts thereon.
Can be securely and firmly held in an open state.

As described above, in the first embodiment of the present invention, the step portion 51 is formed on the leaf spring 50, and the step portion 51 is seated on the bottom surface of the accommodation space 33 of the unit base 30, and the principle of leverage By acting as a fulcrum, the spring function of the leaf spring 50 is effectively actuated, and the leaf spring 50
Can be alternately selected from a double-supported type and a cantilevered type, so that the closed state and the open state of the lid 40 can be reliably and firmly held, and furthermore, there is a unique effect that a good rotation operability with a touch can be obtained.

Further, as compared with a conventional U-shaped spring, a stepped portion 51 is provided.
Is a dimension in the thickness direction of the leaf spring 50, and it is not necessary to insert the leaf spring 50 while maintaining the bent state as in the conventional U-shaped spring. At the same time, the thickness of the storage space 33 of the unit base 30 can be set to be small.
In addition, there is an advantage that the vanity mirror unit 20 can be made compact, and a compact vanity mirror unit 20 can be realized.

FIGS. 7 and 8 show various modifications of the first embodiment according to the present invention. The leaf spring used is simpler as shown in FIGS. 7 (a) and 7 (b). Shape.

That is, a simple shape in which a cut-and-raised claw 56a and a locking flange 56b are formed on the fixed portion 52 side of the leaf spring 50 and a flange 54 is formed on the end side of the elastic portion 53 is used. .

In this modified embodiment, instead of setting the stepped portion 51, as shown in FIG.
A rib 36 protrudes from the bottom surface of the
6 is characterized by forming a fulcrum when the leaf spring 50 is elastically deformed.

Reference numeral 37 in the figure denotes a holding rib for holding the leaf spring 50 from above, and has a function of preventing the leaf spring 50 from rattling.

In this embodiment, the rib 3
6 is a fulcrum, and the elastic portion 53
, And the elastic action of the cam piece 42 of the lid 40 allows smooth opening / closing operation and firm holding of the closed state and the open state, thereby contributing to the insertion workability of the leaf spring 50 and the thinning of the unit base 30. While having the same functions and effects as the first embodiment, there are the following remarkable effects.

That is, since the leaf spring 50 is set to have a simpler shape, the formability of the leaf spring 50 becomes simpler, and the spring force can be adjusted only by adjusting the dimension of the rib 36. There is an advantage that it can be easily performed.

Next, a second embodiment of the present invention will be described in detail with reference to FIGS.

First, as shown in FIG. 10, a fixing portion 52 of a leaf spring 50 used in the second embodiment has a holding portion 56 and a locking claw 57 so that the fixing portion 52 can be inserted and fixed to the end of the unit base 30. Is formed.

On the other hand, the elastic portion 53 abutting on the cam piece 42 of the lid 40 is formed as a step protruding upward, and a flange 54 is set at the end.

Then, as shown in FIG. 9, the elastic portion 53 of the leaf spring 50 is inserted into the housing space 33 through the insertion hole 34 of the unit base 30, and the panel terminal 38 of the unit base 30 is clamped by the clamping portion 56. By fixing and engaging the locking claw 57 with the locking recess 39,
The leaf spring 50 is securely fixed to the unit base 30.

The closed state and the opened state of the lid 40 are shown in FIGS. 11 and 12, respectively.
In the closed state, the cam piece 4 formed on the lid 40
2 flat deformed cam surface 42a presses the elastic portion 53 surface of the leaf spring 50, the flange 54 abuts on the bottom surface of the unit base 30, and the deformed cam surface 42a is a double-supported elastic portion 53 surface of the leaf spring 50. The closed state of the lid 40 is securely and firmly held by the strong spring repulsive force. Similarly, even in the open state of the lid 40 shown in FIG. The lid 40 is held.

In the middle of the opening operation of the lid 40, as shown in FIG.
Is in contact with the elastic portion 53 of the leaf spring 50, and at this time, the flange 54 is floated from the bottom surface of the unit base 30. No repulsion acts and smooth operation can be expected.

As described above, when the lid 40 is in the closed state and in the open state of about 90 °, the leaf spring 50 operates in a double-supported manner, and while the lid 40 is being opened, the leaf spring 50
Works in a cantilevered manner, so the lid 4
0 can be firmly held in the closed state and the open state, and the operability is significantly improved.

Further, in order to attach the leaf spring 50 to the unit base 30, the leaf spring 50 may be attached so as to be inserted into the terminal 38 of the unit base 30, so that the attaching workability is improved and the accommodation of the leaf spring 50 is improved. Space 33
Has an effect that the thickness can be set significantly smaller than that of the U-shaped spring, and a compact unit base 30 can be realized.

As shown in FIG. 13, by setting the insertion hole 34 of the leaf spring 50 in the bottom wall, the insertion hole 34
May be made inconspicuous to the outside to improve the design.

In each of the embodiments described above, the present invention is applied to the vanity mirror unit 20 installed in the sun visor for an automobile.
The structure is not particularly limited as long as it can be opened and closed.

[0053]

As described above, the present invention has the following special functions and effects.

(1) The lid opening / closing structure according to the present invention comprises:
Since the leaf spring is set on the unit base side corresponding to the cam piece of the lid, the leaf spring can be easily attached to the unit base compared to the conventional U-shaped spring, and the workability is improved. Has an effect.

(2) The lid opening / closing structure according to the present invention comprises:
Since a simple leaf spring is inserted and fixed in the unit base instead of the conventional U-shaped spring, the dimension and thickness of the space for accommodating the leaf spring can be set small, and the unit base is made thinner and the unit is compact. This has the effect that the conversion can be achieved.

(3) The lid opening / closing structure according to the present invention comprises:
As a leaf spring that resiliently contacts the cam piece of the lid, it is a two-sided type when the lid is closed and open, and a unique shape leaf spring that is cantilevered while the lid is open, so opening and closing the lid The operation can be performed smoothly, and the posture can be reliably and firmly maintained in the closed state and the open state.

(4) The lid opening / closing structure according to the present invention comprises:
In order to use a simple leaf spring instead of a U-shaped spring,
This has the effect that the leaf spring can be easily formed.

[Brief description of the drawings]

FIG. 1 is a front view showing an automotive sun visor equipped with a vanity mirror unit according to an embodiment of the present invention.

FIG. 2 is a perspective view showing a vanity mirror unit according to an embodiment of the present invention.

FIG. 3 is a sectional view showing a first embodiment of a lid opening / closing structure according to the present invention.

FIG. 4 is a perspective view showing a leaf spring used in the lid opening / closing structure shown in FIG. 3;

FIG. 5 is a sectional view showing a closed state of the lid according to the first embodiment of the present invention.

FIG. 6 is a sectional view showing an opened state of a lid according to the first embodiment of the present invention.

FIG. 7 is a perspective view showing a modification of the leaf spring used in the first embodiment of the present invention.

FIG. 8 is a sectional view showing a state where the leaf spring shown in FIG. 7 is attached to a unit base.

FIG. 9 is a sectional view showing a second embodiment of the lid opening / closing structure according to the present invention.

FIG. 10 is a perspective view showing a leaf spring used in the lid opening / closing structure shown in FIG. 9;

FIG. 11 is a sectional view showing a closed state of a lid according to a second embodiment of the present invention.

FIG. 12 is a sectional view showing an opened state of a lid according to a second embodiment of the present invention.

FIG. 13 is a sectional view showing a modification of the second embodiment of the present invention.

FIG. 14 is a front view showing a sun visor equipped with a conventional vanity mirror unit.

FIG. 15 is a sectional view showing a conventional lid opening / closing structure.

[Explanation of symbols]

 Reference Signs List 10 sun visor for automobile 20 vanity mirror unit 30 unit base 31 vanity mirror 33 accommodation space 34 insertion hole 36, 37 rib 40 lid 42 cam piece 42a, 42b, 42c deformed cam surface 50 leaf spring 52 fixing portion 53 elastic portion 54 flange

Claims (1)

(57) [Claims] A unit base (3) made of a resin molded body.
In the opening and closing structure of the lid (40) which is attached to the lid (40) by a hinge mechanism so as to be openable and closable, a deformed cam surface (4)
2a, 42b, 42c) are integrally formed, and the cam piece (42) is provided on the unit base (30) side for accommodating the rotating shaft side of the lid (40).
A leaf spring (50) is provided at a location corresponding to
The leaf spring (50) has a cam piece (42) of the lid (40).
The elastic part (53) which elastically contacts with is set ,
Flat variant of the cam piece (42) of the lid (40)
When making elastic contact with the cam surfaces (42a, 42c), the leaf spring (5
The elastic part (53) of (0) becomes a two-sided type, and the lid (4)
0) The curved cam surface (42b) of the cam piece (42)
When the elastic part (53) of the leaf spring (50) is
Lid opening and closing structure characterized by being a portable type .