JP2000238819A - Lid open/close device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To damp rotation of a lid by providing a contact member which can move relatively with an elastic member in directions where it comes close to/farther away from a support point of the elastic member and is biased by elastic force of the elastic member in contact with the member. SOLUTION: A lid 3 is integrally equipped with a pressed piece 3a comprising a protruding form. An end 3e of the piece 3a which is a far end in a longitudinal direction is brought into contact with an arm 5b of a return coil spring 5 provided on a body 2. This constitution causes the lid 3 to rotate in a direction of opening the lid by force applied by an open coil spring 4 when a lock member is unhooked from a lid closing position. Then an end 3e of the piece 3a of the lid 3 interlocking with the rotation moves toward an attaching portion 6 while sliding on the arm 5b of the return coil spring 5. Thus biasing force in the direction of opening the lid which increases with the rotation works, so that the lid 3 exhibits a rotation operation at a suppressed rotation speed.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cover opening and closing device for opening and closing a portion to be opened and closed on a main body with a cover.
More specifically, the present invention relates to a lid opening / closing device suitable for a lid that allows a recording medium storage portion of an audio device, a game device, or the like to be freely opened and closed.

[0002]

2. Description of the Related Art In audio equipment and game equipment (entertainment equipment), a storage part for storing a tape cassette or an optical disk is openable and closable by a lid. As shown in FIG. 9, the lid opening / closing device moves the lid 102 rotatably supported by the main body 101 to a tape cassette, an optical disk, or the like with respect to a storage section in which a data recording / reproducing section and the like are arranged. It is rotatable in an opening direction (opening direction) and a closing direction (closing direction) with respect to the opened / closed portion 101a formed on the main body 101 for taking in and out.

As shown in FIG. 9, a conventional lid opening apparatus 100 has a support shaft 107 for rotatably supporting a lid 102 with respect to a main body, and a biasing mechanism for urging the lid 102 in a lid opening direction. A torsion coil spring 103 serving as a biasing member, and a damper gear 105 and a fan-shaped gear 106 as a damping mechanism 104 for mitigating a sudden rotation of the lid 102 are provided.

[0004] The torsion coil spring 103 includes a coil portion 103.
a is attached to, for example, the support shaft 107 of the lid 102, the arm 103 b at one end is locked to a locking portion (not shown) of the lid 102, and the arm 103 c at the other end is locked to the main body 101. It is locked to the part 108. This torsion coil spring 1
03 urges the lid 102 in the lid opening direction. Therefore, the lid 102 receives the largest urging force from the most displaced torsion coil spring 103 in the closed position (the position indicated by the two-dot broken line in the figure).

[0005] The fan gear 106 constituting the damping mechanism 104 is integrally provided near the support shaft 107 of the lid 102, that is, is rotated with the lid 102. The damper gear 105 meshed with the sector gear 106 is rotatably provided on the main body 101. The damper gear 105 constitutes a gear damper mechanism, and is rotatably supported by an oil damper (not shown). Damper gear 1
When the fan 05 is rotated by the fan gear 106, it receives a drag due to the viscosity of damper oil in an oil damper (not shown).

[0006] Further, when the lid 102 is in the closed position,
A locking member (not shown) of the main body 101 is locked against the urging force of the torsion coil spring 103 to maintain the closed state.

[0007] The conventional lid opening and closing device 1 configured as described above.
At 00, for example, when the locking by the lock member described above is released by a button operation or the like, the lid 102 is rotated in the lid opening direction by the urging force of the torsion coil spring 103, while the damping mechanism 104 It receives drag in the direction of closing the lid.

Thus, even when the torsion coil spring 103 starts rotating from the closed position where the torsion coil spring 103 receives the largest urging force, the lid 102 keeps the torsion coil spring 10 in position.
The rotation speed is made slower in the operation immediately after the start of rotation and in the subsequent rotation operation than when the cover is opened with only 3 provided. The user feels a sense of quality to the device by such an operation.

[0009]

When a damping mechanism is constituted by a gear damper mechanism comprising a damper gear 105 and an oil damper, it is necessary to provide a meshing fan-shaped gear 106 on the cover 102, and the structure is not sufficient. It gets complicated. And, at the time of manufacture, the fan gear 1
06 must be formed integrally with the lid 102, and the mold structure used for manufacturing becomes complicated, and the mold allowance increases.

The damper gear 105 and the sector gear 10
6, the urging force of the torsion coil spring 103 is transmitted by meshing, and if the gear size shifts, the teeth jump, so that the accuracy of the gear size is required.

Furthermore, the damper gear 105 is damped by a damper oil such as a silicone oil in a rotation operation interlocked with the lid 102. Since the viscosity of the damper oil is influenced by the temperature condition of the use environment, the use temperature is reduced. Is changed, the opening time of the lid 102 does not become constant. Further, it is difficult to reuse silicon oil, and it takes time to dispose.

As described above, the conventional lid opening / closing device that suppresses the rotation speed of the lid 102 by using the damper gear 105 has the above-described problem.

The gear damper mechanism is expensive because of its complicated structure and the like, and it is desired to provide a low-cost damping mechanism.

Therefore, the present invention has been made in view of the above-described circumstances, and has been described as being easy to manufacture, low in cost, and satisfying the conditions that the performance is constant irrespective of the use conditions, and the rotation of the lid body is achieved. It is an object of the present invention to provide a lid opening / closing device capable of damping an operation.

[0015]

According to the present invention, there is provided a lid opening / closing apparatus for solving the above-mentioned problems, comprising a lid which is rotatably supported by a main body and which opens and closes a portion to be opened / closed of the main body. An opening urging means for urging the lid in the opening direction, an elastic member which is cantilevered, and which is relatively movable with respect to the elastic member in a direction approaching / separating from a support point of the elastic member. And a contact member that is in contact with the elastic member and is urged by the elastic force of the elastic member. Then, the lid opening and closing device is urged in the closing direction by the elastic force of the elastic member that the lid acts on the contact member, and the contact member interlocks with the pivoting operation of the lid in the opening direction, The relative movement of the elastic member toward the support point is performed.

In the lid opening / closing device having such a configuration, the contact member is relatively moved on the elastic member in the direction of the support point of the elastic member in conjunction with the turning operation of the lid in the opening direction. The repulsive force of the elastic member, which is increased in accordance with the turning operation of the lid in the opening direction, that is, the elastic force of the elastic member acting on the contact member is transmitted as a biasing force in the closing direction of the lid. You.

[0017]

Embodiments of the present invention will be described below in detail with reference to the drawings. The present embodiment is a lid opening / closing device that supports a lid to be opened and closed with respect to an opened / closed portion provided on a main body. For example, the lid opening / closing device is configured so that a recording medium storage section of an audio device or an entertainment device can be opened and closed by a lid.

For example, an entertainment device includes a storage section for storing a recording medium such as an optical disk on which a game program or the like is recorded, and a data processing section for executing the game program recorded on the recording medium. In such an entertainment device, the lid opening / closing device is provided in the housing of the main body, and the opening / closing portion for opening / closing the optical disk with respect to the storage portion provided so as to face outward is opened / closed by the lid. It is free.

As shown in FIG. 1, in the lid opening device, a lid 3 is rotatably supported by a main body 2.

The main body 2 has, for example, a substantially box shape, and on one surface thereof, an openable / closable portion 2a is provided as a loading / unloading portion for accommodating a recording medium in a recording medium accommodating portion. The main body 2 rotatably supports the lid 3 so that the opened and closed portion 2a can be opened and closed.

The lid 3 is formed in a substantially flat plate having a size corresponding to the shape of the portion to be opened / closed 2a of the main body 2. A main surface portion 3b for closing a storage portion and the like provided inside the main body portion 2, and a support portion 3c supported by the main body portion 2;
The support portion 3c is provided on a support shaft 3d formed in the main body 2, and is supported rotatably with respect to the main body 2. For example, the lid 3 is locked by a lock member (not shown) provided on the main body 2 in the closed position, and is operated by operating a button disposed outside the housing of the main body 2. The stop is released.

The lid 3 is stopped when the lid 3 is rotated to a predetermined position in the opening direction.
For example, the maximum rotation position (opening position maximum point) of the lid 3 is determined by being engaged with an unillustrated locking portion for stopping the opening of the main body 2. And the support shaft 3 of this lid 3
The coil portion 4a of the open coil spring 4 is attached to the opening d.

The open coil spring 4 is a so-called torsion coil spring comprising a coil portion 4a and arm portions 4b and 4c having different lengths. The open coil spring 4 has a coil portion 4a attached to a support shaft 3d of the lid 3, one arm portion 4c is locked by a locking portion 7 provided on the main body portion 2, and is longer than the arm portion 4c. The other arm portion 4b whose size is increased is locked by a locking portion (not shown) of the lid 3. The coil portion 4a is wound so that the restoring force of the coil portion 4a acts as an urging force in the direction of opening the lid 3 via the arm portion 4b. When the lid 3 is closed, the displacement of the open coil spring 4 is maximized, and the urging force of the open coil spring 4 in the opening direction with respect to the lid 3 is maximized.

The lid 3 is integrally provided with a pressed piece 3a having a protruding shape having a substantially rectangular cross section in the vicinity of the support portion 3c. For example, this pressed piece 3a
Has a substantially bar-shaped protruding shape. The pressed piece 3a extends from the support shaft 3d of the lid 3 in the radial direction so that the support portion 3c
Are provided integrally. Therefore, the pressed piece 3 a rotates together with the lid 3 so as to be the same as the rotation center of the lid 3.

The pressed piece 3a has one end 3e, which is the far end in the longitudinal direction, in contact with the arm 5a of the return coil spring 5 provided on the main body 2. Lid 2
2, the one end 3e of the pressed piece 3a approaches the mounting portion 6 of the return coil spring 5 on an arc centered on the rotation axis of the cover 3, as shown in FIG. Move in the direction.

The return coil spring 5 is a so-called torsion coil spring comprising a coil portion 5a and arms 5b and 5c having different lengths. The return coil spring 5 has a coil portion 5a attached to an attachment portion 6 provided in the main body portion 2, one arm portion 5c is engaged with a locking portion 8 formed in the main body portion 2, and the arm portion The other arm 5b having a length larger than 5c is locked by the one end 3e of the pressed piece 3a as described above. And the coil part 5a
It is wound so that the restoring force of the coil portion 5a acts as an urging force of the arm portion 5b in the direction of the arrangement position of the pressed piece 3a.

The return coil spring 5 includes a pressed piece 3a.
Of the pressed piece 3a is acted upon by the restoring force of the coil portion 5a.

When the lid 3 is rotated in the opening direction, the rotating portion 3d is rotated together with the lid 3 to return the contact position between the arm 5b and the one end 3e. The arm 5d moves in the direction approaching the mounting portion 6 of the coil spring 5, and the arm 5d is moved by the pressed piece 3a.
Is pushed away from the center of rotation.

Therefore, when the lid 3 is rotated in the opening direction, the contact point of the one end 3e is brought into contact with the pressed piece 3a by the arm 5b.
In addition to the increase in the moment due to the movement to the mounting portion 6 side, which is the support point, that is, the increase in the urging force generated due to the movement of the one end 3e toward the mounting portion 6 on the arm 5b, The coil portion 5a is displaced when the arm portion 5 is pressed by the pressing piece 3a, and the coil portion 5a is displaced.
Of the restoring force acts via the arm 5b.

When the lid 3 is in the closed position, the urging force of the return coil spring 5 to the pressed piece 3a is minimized.

The characteristics of the return coil spring 5, such as the shape and the spring constant, are different from the urging force transmitted to the lid 3 via the pressed piece 3a. The balance is determined in consideration of the balance. That is, the specifications and characteristics of the return coil spring 5 and the open coil spring 4 are determined so that the lid 3 performs a predetermined rotation operation by a resultant force acting as an urging force on the lid 3.

When the locking member (not shown) is released from the closed position shown in FIG. 1 by the lid opening / closing device 1 having the above structure, the lid is opened by the biasing force of the opening coil spring 4. The body 3 is rotated in the cover opening direction as shown in FIG. In conjunction with this rotation operation, one end 3e of the pressed piece 3a of the lid 3 is returned to the return coil spring 5
Is moved in the direction of the mounting portion 6 of the return coil spring 5 while sliding on the arm portion 5b.

The one end 3e of the pressed piece 3a slides on the arm 5b and moves in the direction of the mounting portion 6 of the return coil spring 5, so that the contact point of the one end 3e on the arm 5b is set. As the coil portion 5a moves and the coil portion 5a is further displaced, the repulsive force of the return coil spring 5 against the one end portion 3e is increased, and the increased repulsive force is pressed as a biasing force on the lid 3 in the closing direction. It is transmitted via the piece 3a.

Accordingly, the urging force from the open coil spring 4 that decreases as the cover 3 is rotated in the cover opening direction acts to rotate the cover 3 in the cover open direction, while the return coil spring 5 Since the biasing force in the closing direction increases as the cover 3 is rotated, the cover 3 exhibits a rotating operation in which the rotating speed is suppressed.

As described above, the lid opening / closing apparatus 1 can suppress the rotation speed of the lid 3 in the opening direction only by combining the opening and return coil springs 4 and 5. Therefore, the lid opening / closing device 1 makes it possible to dampen the turning operation of the lid while satisfying the conditions such as easy manufacturing, low cost, and constant performance regardless of the use conditions.

That is, the above-described conventional lid opening / closing device 10
Since the gear damper mechanism is not used as in the case of 0, the opening time of the lid 3 independent of the temperature can be obtained. Further, the problem caused by the gear, for example, the problem of tooth skipping, does not occur. Further, the return coil spring 5 can be made of a reusable material such as stainless steel or ABS resin. Further, since there is no need to provide a sector gear, the cost of the mold can be saved.

The specifications and characteristics of the return coil spring 5 depend on the biasing force applied to one end 3e of the pressed piece 3a.
Is determined in consideration of the balance with the rotational moment due to the urging force applied to the cover 3 by the open coil spring 4 when viewed from the rotational moment at. That is, the specifications, characteristics, and the like of the return coil spring 5 and the open coil spring 4 are determined so that the lid 3 performs a predetermined rotation operation.

For example, at the maximum point of the opening position of the lid 3, the sum of the rotational moment by the urging force of the return coil spring 5 on the lid 3 and the rotational moment by the urging force of the lid 3 by the opening coil spring 4 is substantially zero. So that
The shape and the spring constant of the return coil spring 5 are determined. As a result, the lid 3 that has been rotated in the lid opening direction is stopped near the maximum point of the open position of the lid 3.

FIGS. 3 and 6 show specific examples of the return coil spring 5 and the open coil spring 4. FIG.

As shown in FIGS. 3 and 4, the return coil spring 5 has a coil portion 5a and arm portions 5 having different lengths from each other.
This is a so-called torsion coil spring having b and 5c. As shown in FIGS. 5 and 6, the open coil spring 4 also has a coil portion 4a and arm portions 4b and 4 having different lengths from each other.
This is a so-called torsion coil spring having c.

In this example, the arm 5b of the return coil spring 5
Has a bent portion 5b ₁ in the middle portion. For example, the arm portion 5b extending from the coil portion 5a in this way is set at 5 °
By bending about to 10 °, it is possible to abruptly change the repulsive force transmitted to the pressed piece 3a before and after the bending portions 5b _1. Further, the opening coil spring 4 is provided with hooks 4b ₁ and 4c ₁ for hooking the arms at the ends of the arms 4b and 4c. Thus, the hook 4
By providing b ₁ , 4c ₁ , the hooking by the hooking portion 8 is completed.

The shape and position of the pressed piece 3a, which is a contact member, and the shape and position of the return coil spring 5 are not limited to the above-described embodiment of the present invention. For example, a contact member may be provided on the main body 2 and a return coil spring 5 may be provided on the lid 3.
In this case, the contact member is fixed to the main body and, for example, the lid 3
The contact member is moved relatively to the mounting portion of the return coil spring 5 by moving the return coil spring 5 attached to the cover member 3 in conjunction with the turning operation of the lid 3.

Next, an embodiment will be described. In this embodiment, in the lid opening / closing device 1 configured as shown in FIGS. 1 and 2, the transmission system of the force of the open coil spring 4, the return coil spring 5, and the lid 3 is modeled, and the rotation axis of the lid 3 is The moment around the (support shaft) is calculated.

Table 1 shows conditions concerning the shapes and the like of the open coil spring 4 and the return coil spring 5 used in the calculation. Here, d is the spring material diameter, D is the coil portion 4a, 5a average diameter, N is the coil portion 4a, 5a coil turns of, E is Young's modulus, a ₁ is the coil portion 4a, 5a and the arm portion 4b , 5b
The distance between the point of application of force in, and a ₂ coil unit 4
a, 5a and the point of action of the force on the arms 4c, 5c.

[0045]

[Table 1]

For example, as shown in FIG. 7, in the return coil spring 5, a ₁ is the distance between the coil 5a and the contact point of one end 3e on the arm 5b, and a ₂ is the coil 5a.
And the distance between the support point of the hook 8 on the arm 5c.

Then, under such conditions, as shown in Tables 2 and 3, respective values such as force and moment are calculated.

[0048]

[Table 2]

[0049]

[Table 3]

Here, the opening angle shown in Table 2 is the angle (°) at which the lid 3 is rotated from the closed position to the open direction.
The spring angle is a displacement angle (°) from a natural state.

F is the force acting at the point of action of the arms 4b, 5b at the distance a ₁ (vertical force at the point of action of the arms 4b, 5b), and Flid is the weight of the lid 3 due to its own weight. The force acting on the center (center of gravity) position of the lid 3 (the vertical force acting on the lid 3 acting on the center of gravity of the lid 3), Fact acts on the lid in consideration of the force F of the open coil spring 4. , M is a moment, Mo is a moment about the rotation axis of the lid 3 based on the force Fact, K is a spring constant, and φ is a displacement angle (ra
d), ψ is the direction perpendicular to the arm 5b, that is, the angle between the direction of the force F and the direction perpendicular to the pressed piece 3a, and Fr is one end 3e calculated by the angle ψ.
The force F applied to the pressed piece 3a in the vertical direction (= cosψ × F), Mfr is the moment generated around the rotation axis of the lid 3 by the force Fr, and Mall is the moment about the rotation axis of the lid 3 This is the total moment of the moment Mo caused by the weight of the lid 3 itself, the moment M of the open coil spring 4 (M shown in Table 2), and the moment of the return coil spring 5.

The weight of the lid 3 is 90 gf.
Has a center (center of gravity) position of 80.5 mm, so, for example,
The moment M1 due to the dead weight of the lid 3 is maximum at the closed position, and specifically, the maximum value M1max is 0.9 × 80.5 = 7.
It becomes 25 (kg · mm).

Further, if the moment of the opening coil spring 4 is not greater than the moment due to the weight of the lid 3, the lid 3 cannot start to be opened in the opening direction. The value is set to a value in the vicinity of about twice the moment due to the weight of No. 3. The spring constant is calculated using the following equation (1).

K = E × π × d ⁴ / (64 × π × D × N + ／ (a ₁ + a ₂ )) (1) For example, the spring constant K of the open coil spring 4 is as follows. Is calculated.

K = 19 × 10 ³ × π × d ⁴ /(64×π×9.2×
6 + ／ (32.2 + 8.3)) FIG. 8 shows the relationship between the opening angle of the cover 3 and each moment about the rotation axis of the cover 3.

In FIG. 8, the symbol Δ indicates the moment M due to the urging force of the open coil spring 4, and the symbol ▲ indicates the moment M due to the weight of the lid 3 from the moment M of the open coil spring 4.
The moment obtained by subtracting o, and the symbol ■ indicate the total moment of the moment of the lid 3, the open coil spring 4, and the return coil spring 5.

As shown in FIG. 8, the return coil spring 5
Return coil spring 5 than the result without
As a result (marked with ■), the moment becomes smaller as a whole, and the difference between the moments increases as the opening angle of the lid 3 increases.

Thus, by providing the return coil spring 5, it is possible to obtain a result that the rotation speed decreases as the lid 3 is rotated in the opening direction. Therefore, the lid opening / closing device 1 can obtain the same effect as the damping by the conventionally used gear damper mechanism that suppresses the rotation speed of the lid 3 by using the resistance increased according to the rotation speed. it can.

Further, depending on the design of the return coil spring 4, it can be stopped near the maximum opening position of the lid 3. As described above, when it is desired to stop the lid 3 at the predetermined position, for example, by considering the friction caused by the contact between the arm 5b and the one end 3e of the pressed piece 3a, the lid 3 can be more accurately rotated. The rotation of the body 3 can also be stopped.

[0060]

The lid opening and closing device according to the present invention is rotatably supported by the main body, and opens and closes a portion to be opened and closed of the main body, and an opening bias for urging the lid in the opening direction. Means, a cantilevered elastic member, and a movable member which is relatively movable with respect to the elastic member in a direction approaching / separating from a support point of the elastic member, and which is in contact with the elastic member and which has an elastic force. And the lid is urged in the closing direction by the elastic force of the elastic member acting on the contact member, and the contact member pivots in the opening direction of the lid. In conjunction with the elastic member, the elastic member is relatively moved in the direction of the support point, so that the repulsive force of the elastic member, which is increased in accordance with the pivoting operation of the lid in the opening direction, acts as a biasing force in the closing direction of the lid. Can be transmitted.

Thus, the lid opening / closing device can dampen the turning operation of the lid while satisfying the conditions such as easy manufacturing, low cost, and constant performance regardless of use conditions.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view illustrating a configuration of a lid opening / closing device according to an embodiment of the present invention.

FIG. 2 is a cross-sectional view showing a state where the lid is rotated in a lid opening direction in the lid opening and closing device described above.

FIG. 3 is a front view showing a configuration of a return coil spring.

FIG. 4 is a plan view showing a configuration of a return coil spring.

FIG. 5 is a front view showing a configuration of an open coil spring.

FIG. 6 is a plan view showing a configuration of an open coil spring.

FIG. 7 is a diagram showing a configuration of a part of a lid opening / closing device modeled for calculation.

FIG. 8 is a characteristic diagram showing a relationship between an opening angle of the lid and a moment applied to the lid.

FIG. 9 is a cross-sectional view illustrating a configuration of a conventional lid opening / closing device.

[Explanation of symbols]

2 body part, 2a opened / closed part, 3 lid, 3a rotating part, 4 open coil spring, 5 return coil spring,

Claims (3)

[Claims] 1. A lid which is rotatably supported by a main body and opens and closes a portion to be opened and closed of the main body, an opening urging means for urging the lid in an opening direction, and is cantilevered. An elastic member, which is movable relative to the elastic member in a direction to come into contact with and separate from a support point of the elastic member, and is urged by the elastic force of the elastic member by contacting the elastic member. A contact member, wherein the lid is urged in a closing direction by an elastic force of the elastic member acting on the contact member, and the contact member rotates in the opening direction of the lid. A lid opening / closing device, wherein relative movement of the elastic member in the direction of a support point is performed in conjunction with the operation. 2. A support point of the elastic member and a rotation axis of the lid are different from each other, and the contact member is a member provided integrally with the rotation axis of the lid. 2. The lid opening / closing device according to claim 1, wherein: 3. The lid opening and closing device according to claim 1, wherein the elastic member is a torsion spring.