JP5250570B2 - Lid opening / closing device - Google Patents

Description

  The present invention relates to a lid opening / closing device.

  As a mechanism for assisting the opening and closing of the heavy lid, there is a mechanism in which a counterweight (or balance weight) is attached to the lid. For example, in Patent Document 1, the arm attached to the back surface of the lid and the arm to which the balance weight is fixed are interlocked via a gear that meshes with each other so that the balance weight is lowered when the lid is opened. ing.

JP 2005-146570 A

  By attaching a counterweight to the lid, the lid can be opened and closed more easily than when no counterweight is provided, but there are problems such as unstable opening and closing speed and the load of opening and closing the lid. There was a request to reduce. For example, when trying to reduce the load of opening and closing the lid, the lid is too easy to open, and the lid collides with the structure attached with the lid vigorously when opening and closing the lid and the structure. The doors had to be opened and closed carefully to prevent damage. In addition, the load required to open and close the lid may increase too much so that the lid does not easily open.

  It is an object of the present invention to provide a lid opening / closing device that can easily open and close the lid and can open and close the lid at a stable speed.

  The lid opening / closing device of the present invention has a lid that is rotatably supported with a position other than the position of the center of gravity as a fulcrum when viewed in cross section, and the center of gravity of the lid and the opposite side across the fulcrum A counterweight that acts on its own weight, and the counterweight is formed of a rigid body, and the counterweight is separated from the fulcrum of the lid at a first connecting portion other than the center of gravity of the counterweight. The second connection portion of the counterweight, which is pivotally connected to the position and other than the first connection portion, other than the position of the center of gravity of the counterweight, generates drag in the horizontal direction with respect to the counterweight. It is connected so that it may move along a track | orbit.

According to the present invention, the moment in the direction to open the lid due to the counterweight (opening moment) and the moment in the direction to close the lid due to the weight of the lid (closing moment) Acts on the lid. The counterclockwise direction around the fulcrum is positive and the clockwise direction is negative. Furthermore, when the moment value is positive, the moment is the opening direction moment, and when the moment value is negative, the moment is the closing direction moment.
Then, by appropriately setting the weight of the counterweight, the sum of the opening moment due to the counterweight weight and the closing moment due to the lid weight is reduced as the angle at which the lid is opened increases. be able to.
In addition, a drag force in the horizontal direction is generated against the counterweight by the second connecting portion, and a moment (opening moment) in a direction to open the lid body due to the drag acts on the lid body.
When the balance of these three moments acting on the lid is adjusted and the lid opening angle is small, the moment in the opening direction is applied to the lid so that the sum of the three moments becomes a positive value. Let Then, the total value of the three moments decreases as the opening angle of the lid increases. Further, when the rotation angle increases, the sum of the three moments becomes a negative value, and a moment in the closing direction is applied to the lid.
In this way, the balance of moment can be changed during the operation of opening the lid, so the operation of opening the lid can be performed with a light load, and the operation of opening the lid when the rotation angle of the lid increases. Can be suppressed.
Therefore, according to the present invention, the lid can be easily opened and closed, and the lid can be opened and closed at a stable speed.

  In the lid opening / closing device of the present invention, the angle formed by the line connecting the center of gravity of the lid and the fulcrum and the line connecting the first connecting portion and the fulcrum is less than 180 degrees vertically below. It is preferable that

  According to the present invention, the moment in the opening direction due to the weight of the counterweight can be reduced by reducing the angle within the range of the angle. For this reason, the sum of the three moments acting on the lid takes a large positive value, and the opening moment due to the weight of the counterweight is reduced so that the lid does not open suddenly. The lid can be opened and closed at a more stable speed by adjusting so that the total value is not a large positive value.

  In the lid opening / closing device of the present invention, it is preferable that the track of the second connecting portion extends in the vertical direction.

According to the present invention, since the trajectory of the second connecting portion is limited in the vertical direction, the horizontal drag against the counterweight can be generated more efficiently.
Furthermore, since the movement of the second connecting portion in the horizontal direction is suppressed, the space for operating the lid opening / closing device can be reduced.

  In the lid opening / closing device of the present invention, the lid opening / closing device has a support shaft that is orthogonal to the cross section and passes through the fulcrum, and the counterweight is provided at at least one of axial ends of the support shaft. preferable.

  According to this invention, in a structure such as a box to which the lid opening / closing device is attached, the counterweight can be provided on the side surface inside the structure. Therefore, a wide space inside the structure can be secured, and contact with an object accommodated inside the structure can also be prevented.

  In the lid opening / closing device according to the present invention, the third connection portion of the counterweight, which is different from the first connection portion and the second connection portion, may rotate the counterweight according to the rotation angle of the lid body. It is preferably connected to a braking device that controls the movement.

According to the present invention, since the rotation of the counterweight can be controlled in accordance with the rotation angle of the lid, the opening operation of the lid can be stopped when the lid is opened by a predetermined angle. . Therefore, the rapid rotation of the lid can be stopped.
Further, for example, when a person using a structure provided with the lid opening / closing device opens the lid to a predetermined angle, the operation of the lid can be stopped by the braking device even if the hand is released, It is possible to facilitate operations such as housing an object in the structure using the.

  In the lid opening / closing device of the present invention, the braking device includes at least two or more pulleys and a belt spanned between two fixed end portions set outside the rotation range of the third connecting portion. The braking device preferably rolls the at least two pulleys on the belt when the lid and the counterweight rotate.

  According to the present invention, the braking device having a simple configuration using the frictional force generated when the pulley rolls on the belt controls the rotation of the counterweight and stops the sudden rotation of the lid. It can be made. Furthermore, according to the present invention, superior durability is exhibited as compared with a method in which a cylinder is used for opening and closing the lid. Furthermore, the braking device of the present invention exhibits superior durability than the braking device using a chain or a wire instead of a belt, and the sound generated when the pulley rolls can be reduced.

  In the lid opening / closing device of the present invention, it is preferable that the length of the belt is longer than a length of a line segment connecting the two fixed end portions.

According to this invention, when the lid is closed, the belt can be in a relaxed state. When the lid is rotated, the counterweight is also rotated, and the pulley of the braking device is urged in the direction from the first connecting portion toward the third connecting portion. At this time, since the belt is also urged in the direction, the belt can be in a tensioned state. In a state where the belt is tensioned, the rolling of the pulley is suppressed, and thus the rotation of the counterweight is suppressed.
In this way, the initial operation of opening the lid can be performed with a light load, and when the rotation angle of the lid increases, counterweight rotation is suppressed, and the lid opening operation can be stopped.

The figure explaining the principle and structure of the cover body opening / closing apparatus which concerns on this invention. The figure explaining the balance of force of structure BCD. The figure which shows the positional relationship of the point A, the point O, and the point B according to the rotation angle (gamma) of structure AOB. The figure which shows the positional relationship of the point A, the point O, and the point B according to the rotation angle (gamma) of structure AOB on conditions different from FIG. The figure which shows the positional relationship of the point A, the point O, the point B, the point C, and the point D in the structure AOB and the structure BCD. The figure which shows the positional relationship of the point A, the point O, the point B, the point C, and the point D in the structure AOB under the conditions different from FIG. 5 and the structure BCD. It is a perspective view which shows the trash box which concerns on embodiment of this invention. Sectional drawing of the said trash box which shows the cover body opening / closing apparatus which concerns on embodiment of this invention. Sectional drawing of the said trash box which shows the state which opened the cover body of the cover body opening / closing apparatus in FIG. The figure which shows the braking device which concerns on embodiment of this invention.

[Principle and structure of the present invention]
[1] Description of Structure / Position FIG. 1 is a diagram for explaining the principle and structure of a lid opening / closing device according to the present invention by looking at its cross section. Here, description will be made using the XY coordinate system. Note that gravity acts in the negative direction of the Y axis.
In addition, a vector shown in the following formula (1) is hereinafter expressed as a vector OA.

The triangle (or straight line) AOB is a structure that can freely rotate with the point O as a fulcrum, corresponds to a lid in the lid opening / closing device, and is hereinafter referred to as a structure AOB.
A point O is the origin of the XY coordinate system and a fulcrum for freely rotating the structure AOB, and the counterclockwise direction is positive.
Point A is a point where the load of the lid acts.
Point B is a point at which a counterweight (triangle BDC), which will be described later, is connected, and is a point at which a force by the counterweight acts (first connection part).
The angle in the negative Y-axis direction formed by the vector OA and the vector OB is represented by π-α (rad). Here, α is set to a value between 0 and π / 3. That is, the point O, the point A, and the point B become a line segment AOB when α = 0. When α exceeds 0 (rad) (α> 0), the line segment OA and the line segment OB intersect at a point O. Here, the length of the vector OA is ka, and the length of the vector OB is kb.
The degree of rotation of the lid with the point O as a fulcrum is expressed by a rotation angle γ (counterclockwise angle from the X axis) formed by the vector OA and the X axis (positive direction).
When the angle (counterclockwise) formed by the straight line OB and the X axis (negative direction) is θ, the relationship of the following equation (2) is established.

The triangle BDC is connected to the line segment AB at the point B as the first connecting portion, and is a rigid body that can freely rotate with the point B as a fulcrum, and represents a counterweight in the lid opening / closing device. It is called body BDC.
Point C is a part on the rigid body and serves as a third connecting portion that applies a braking force to the counterweight as necessary. In order to apply the braking force, a braking device described later is used.
Point D is a second connecting portion of a counterweight connected on a track formed by a counterweight guide, which will be described later, and is a point that moves on a straight line L.
An angle in the negative Y-axis direction formed by the vector BC and the vector BD is β. Since the structure BDC is a rigid body, β is a constant. Here, the length of the vector BC is kc, and the length of the vector BD is kd.
The vector BC and the X axis (positive direction) form an angle ω in the clockwise direction. When the structure AOB rotates (the lid opens and closes), the position of the point B is displaced while drawing an arc centered on the point O, and the position of the point C is also displaced, so ω is the rotation of the structure AOB. Is a variable.
Note that the structure BDC is not necessarily a triangle as long as the three points B, D, and C can hold a rigid positional relationship with each other.

The straight line L is a straight line representing a trajectory to which the point D of the structure BDC (counterweight) is connected and the point D can move. The point D of the structure BDC moves while being constrained on the straight line L. The straight line L corresponds to a track formed by a control member (counter weight guide) in the lid opening / closing device.
By this constraint, when the angle θ between the line segment OA and the line segment OB takes an arbitrary value, the position of the structure BDC (the position of the point B and the angle ω) is uniquely determined correspondingly.
The straight line L is not necessarily a straight line and may be a curved curve. In other words, any trajectory may be used as long as the point D is moved so as to apply a drag force to the structure BDC in the horizontal direction, and the point D is along a trajectory different from the movement trajectory of the point B as the lid rotates. If the trajectory moves, the drag can be generated in the horizontal direction.

Next, the position of the structure BDC (the positions of the points C and D and the angle ω of the vector BC) when an arbitrary value is given to the angle θ of the line segment AB is obtained.
The coordinates of the point A (components of the vector OA), the coordinates of the point B (components of the vector OB), the components of the vector BC, and the components of the vector BD are expressed as follows.

  Since the coordinates of the point C (the component of the vector OC) are the sum of the component of the vector OB and the component of the vector BC, they are expressed as follows.

  The coordinates of the point D (the component of the vector OD) are the sum of the component of the vector OB and the component of the vector BD, and are expressed as follows.

  Here, the straight line is generally expressed by the following equation (3). However, a, b, and c are constants.

When the point D is located on the straight line L (counterweight guide), the (x, y) coordinates of the point D satisfy the equation (9).
Here, considering the case where the straight line L is a straight line parallel to the y-axis, the straight line L can be expressed by the following equation (10). However, Lc is a constant.

The following equation (11) is derived from the (x, y) coordinates of the point D and the equation (10).

  When this equation (11) is solved for ω, the following equation (12) is derived.

  As a result of obtaining the coordinates of the point C and the point D based on the expression (12), the position of the triangle (structure) BDC can also be obtained.

[2] Balance of Force of Counterweight FIG. 2 is a diagram for explaining the balance of force of the counterweight (structure BDC). The straight line L is vertical (parallel to the y-axis), and the direction of gravity is the vertical direction.
The following three forces act on the counterweight.
Vector FW: gravity acting on the center of gravity M of the counterweight.
Vector FN: Drag due to reaction from counterweight guide (straight line L).
The direction is perpendicular to the straight line L.
Vector FC: The force that the counterweight receives from point B of the structure AOB.
Reaction of force that counterweight acts on structure AOB.

  The balance of these three forces is expressed by the following equation (13).

  The moment balance formula with respect to the point B is expressed by the following formula (14).

  Here, the component of the vector BD is expressed by the following equation (15) as described above.

  Further, if the length of the vector BM (distance from the point B to the point M) is kd and the angle formed by the vector BC and the vector BM is ε, the component of the vector BM is expressed by the following equation (16). . Here, ε is a constant.

  If the weight of the counterweight is fw, the component of the vector FW is expressed by the following equation (17). Here, fw is a positive value.

  Furthermore, if the counterweight receives resistance from the counterweight guide (straight line L) as fn, the component of the vector FN is expressed by the following equation (18).

  Then, the component of the vector FC is expressed by the following equation (19) from the equations (13), (17), and (18).

  Further, the drag force fn can be obtained from the equations (14) to (17), and is represented by the following equation (20).

  From equation (20), it can be seen that fw, km, kd, β, ε are constants, so that drag fn is determined when ω is determined. That is, ω changes with the opening and closing of the lid, and the drag force fn also changes.

[3] Next, the moment acting on the structure AOB will be described.
[3-1] Force that acts on point B The force that the counterweight acts on point B of the structure AOB is expressed by the following equation (21).

  Therefore, the moment that this force acts on the structure AOB is expressed by the following equation (22) as a vector MB.

  Assuming that the unit vector vector Ex in the X-axis direction and the unit vector in the Y-axis direction are the vector Ey, the vector OB and the vector FC are represented by the following equations (23) and (24), respectively.

  Then, the vector MB is calculated as in the following equation (25).

The first term of the rightmost scalar coefficient in equation (25): (fw · kb · cos θ) is the moment of force with respect to point O, which is caused by the counterweight load acting vertically downward on point B. Indicates the size.
Further, the coefficient of the second term of the scalar coefficient on the rightmost side of the equation (25): (fn · kb · sin θ) is a moment (due to the vector FN which is a drag force) generated by constraining the counterweight to the straight line L. . Since fn has already been obtained by the equation (20), the coefficient of the second term is represented by the following equation (26).

[3-2] Force acting on point A The weight of the lid acts on point A of the structure AOB. When the weight of the lid is fa, the lid weight vector FA is expressed by the following equation. Here, fa is a positive value.

  Therefore, the moment that this force acts on the structure AOB is expressed by the following equation (28) as a vector MA.

  Here, assuming that the unit vector vector Ex in the X-axis direction and the unit vector in the Y-axis direction are the vector Ey, the vector OA and the vector FA are expressed by the following equations (29) and (30), respectively.

  Therefore, the vector MA is calculated as in the following equation (31).

  Thus, it can be seen that a moment of magnitude (fa · ka · cos γ) about the point O acts in the negative direction, that is, clockwise in the figure, depending on the weight of the lid.

[4] Simulation of Lid Opening / Closing Device Next, the moment acting on the structural body AOB when the structural body AOB (lid body) is opened and closed will be described with an example.
[4-1] CASE1
Consider a case where the point A, point O, and point B of the structure AOB are in the same straight line (α = 0), and the counterweight does not have a spatial spread and acts only on the point B. Table 1 shows the conditions of the lid opening / closing device.

  When the structure AOB (lid) is opened, the value of γ (= θ) increases, and the moment due to the weight of the counterweight at that time and the moment due to the weight of the structure AOB (lid) ( Table 2 shows the relationship of -fa · ka · cosγ). When the sign of each moment value is positive (plus), the moment acts in the direction in which the lid opens, and when the sign is negative (minus), the moment acts in the direction in which the lid closes. FIG. 3 shows the positional relationship between points A, O, and B in the structure AOB when γ = 0, 30, 60 (degrees).

As shown in Table 2, in CASE 1, regardless of the angle γ at which the structure AOB (lid) is opened, the total moment of the moment due to the counterweight and the moment due to the weight of the lid is zero, and the lid is opened. It can be seen that the balance between the force to try and the moment to close is maintained.
In CASE 1, since the counter weight does not have a spatial spread, the counter weight is not constrained by the straight line L (counter weight guide), and a moment caused by fn does not occur.

[4-2] CASE2
In CASE2, unlike CASE1, α = 20 (degrees) when OA and OB form a predetermined angle. The other conditions were the same as CASE1. Table 3 shows the conditions of the lid opening / closing device.

  Table 4 shows the relationship between the moments due to the counterweight and the moments due to the lid weight. Furthermore, FIG. 4 shows the positional relationship between the points A, O, and B in the structure AOB when γ = 0, 30, 60 (degrees).

  As shown in Table 4, when OA and OB form a predetermined angle, the moment due to fw is smaller than in CASE1. The total moment shows a negative value in the range of γ = 0 to 60 (degrees), and a moment (negative moment) at which the lid is closed acts on the lid. Therefore, a moment for closing the lid is applied, and it can be seen that in CASE 2 it is difficult to open the lid.

[4-3] CASE3
Next, a case where the weight of the counterweight is increased to 140N so that the lid can be easily opened with respect to CASE2 will be described. Other conditions were the same as in CASE2. Table 5 shows the conditions of the lid opening / closing device.

  Table 6 shows the relationship between the moments due to the counterweight and the moments due to the lid weight. Note that the positional relationship among the points A, O, and B in the structure AOB when γ = 0, 30, 60 (degrees) is the same as that in FIG.

  As shown in Table 6, the total moment is 12.6 N · m when γ = 0 (degrees), and the moment to open the lid (moment in the opening direction) is large, and γ = 60 ( ) Is −10.3 N · m, and it can be seen that the moment of closing the lid (moment in the closing direction) is large. That is, it can be said that the lid cannot be opened and closed at a stable speed because the moment change acting on the lid is large in the early and late stages of the lid opening operation. Opening operation of the lid Since the initial moment of opening the lid is large, even when the lid is open or fixed with a hook to prevent the lid from opening, Since the lid opens vigorously at the end, it is difficult to perform the opening operation. Furthermore, when the opening is made up to 60 (degrees), the closing direction moment increases, and the lid tends to close vigorously, making it difficult to work with the lid open.

[4-4] CASE4
Next, the case where the counterweight is a rigid body having a spatial extension in CASE1 will be described. Here, the counterweight is expressed as a triangle (structure) BDC, but is not limited to a plane. A case where the point D is positioned on the straight line L (orbit formed by the counterweight guide) will be described. Table 7 shows the conditions of the lid opening / closing device.

  Table 8 shows the relationship of the total moment between the moment caused by the counterweight and the moment caused by the lid weight. Further, FIG. 5 shows the positional relationship between the points A, O, B, C, and D in the structure AOB and the structure BCD when γ = 0, 30, 60 (degrees). .

As shown in Table 8, it can be seen that the total moment increases as the lid opens (as γ increases). This increase in the total moment is such that the total moment of the moment due to the weight of the counterweight and the moment due to the weight of the cover body is zero, and the point D of the counterweight is positioned on the straight line L (counterweight guide). This is due to the moment generated by (moment caused by fn).
Thus, at the initial stage of the opening operation of the lid, since the moment for the lid to open is not large as in CASE 3, the opening operation can be performed easily and stably. However, it is preferable to attach the braking device to the lid opening / closing device so that the moment at which the lid opens is further increased in the latter stage of the opening operation, so that the opening speed of the lid does not become too fast. Details of this braking device will be described later.

[4-5] CASE5
Next, in CASE4, when OA and OB form a predetermined angle as in CASE2, α = 20 (degrees). The other conditions were the same as CASE4. Table 9 shows the conditions of the lid opening / closing device.

  Table 10 shows the relationship between the moments due to the counterweight and the moments due to the lid weight. Further, FIG. 6 shows the positional relationship between point A, point O, point B, point C, and point D in the structure AOB and the structure BCD when γ = 0, 30, 60 (degrees). .

As shown in Table 10, the change of the total moment is not as great as CASE3 in the range of γ = 0 to 60 (degrees). The sum of the moment due to the weight of the counterweight and the moment due to the weight of the lid body shows a negative value in the range of γ = 0 to 60 (degrees), and the moment to be closed acts on the lid body. Yes. The moment caused by fn shows a positive value in a range of γ = 0 to 60 (degrees), and a moment to open acts on the lid. That is, since the change of the total moment is reduced by the action of the fn-derived moment, the lid can be opened and closed at a stable speed. In particular, since the total moment at the initial stage of the opening operation of the lid is not as large as in CASE 3, it does not open suddenly and tries to open slowly, so it is easy to perform the opening operation. Further, since the total moment in the latter half of the opening operation is not as great as in CASE 4, the opening speed of the lid body does not become too fast in the latter half of the opening operation.
Since the sign of the total moment is reversed in the range of 45 degrees <γ <60 degrees, the total moment of the moment caused by the counterweight and the weight due to the weight of the lid is zero during the opening and closing of the lid. Become balanced.
As described above, it is easier to provide a predetermined angle between the OA and OB of the structure AOB (lid) and control the counter weight to be positioned on the straight line L (counter weight guide) as in CASE5. In addition, the lid can be opened and closed stably.

[4-6] Braking Device Preferably, a mechanism having a pulley and a belt is employed as the braking device. Specifically, two or more pulleys are fixed on a counterweight (triangle BDC) as the same structure, a belt is passed between the pulleys, and the belt is relaxed and fixed to a fixed end. . And a braking force is made to act with respect to a counterweight because a pulley rolls on a belt.
In FIG. 1, the fixed ends are point E and point F, and the point of action of the braking force by the braking device is point C. The point E and the point F are set outside the rotation range of the point C, and are provided on both the left and right sides with a perpendicular passing through the point C in FIG.
As the lid opens (as γ increases), the point C approaches the point F, and the total length of the line segment EC and the line segment FC increases. As a result, the belt changes from a relaxed state to a tensioned state, and the point C gradually becomes difficult to approach the point F, and eventually the point C does not approach the point F any more. This is to prevent further increase in the rotation angle γ, that is, the rotation of the structural material AOB (lid) is controlled.
With such a braking device, when the structure AOB (lid) tries to rotate vigorously, the rotation of the structure AOB (lid) can be smoothly stopped without causing an impact.

[5] Embodiments That Realize the Present Invention Next, as embodiments embodying the lid opening / closing device of the present invention, a structure to which the lid opening / closing device of the present invention is applied will be described as an example.
FIG. 7 is a perspective view of the trash can 1 placed in a garbage collection place such as an apartment house.
FIG. 8 is a cross-sectional view of the trash can 1 as viewed from the side surface portion 22 side of the box body 20. A counterweight 40 is attached to the lid 30.
The trash box 1 includes a box body 20 and a lid body opening / closing device 10 having a lid body 30 and a counterweight 40 that are rotatably attached to the box body 20 and has a single-open structure. .
The box 20 has a front part 21, a side part 22, a back part 23, a top part 24, and a bottom part 25 (see FIGS. 7 and 8). The box 20 has a shape inclined downward from the upper surface portion 24 toward the front surface portion 21. Therefore, the lid 30 is also tilted and attached to the box 20 so as to match the tilt angle.

The lid body 30 includes a lid main body portion 31 attached to the box body 20 and an attachment portion 32 to which a counterweight 40 described later is attached.
The lid body 31 is a substantially rectangular plate-like member, and is bent downward on the front surface 21 side of the box 20 as shown in FIG. When the lid 30 is closed, the front portion 21 and the bent portion of the lid 30 are aligned in the vertical direction on the front side of the trash can 1.
The lid main body 31 is pivotally supported by a support shaft 33 that is orthogonal to the paper surface of FIG. 8 and passes through a fulcrum 33a, and is attached to the box 20 so as to be rotatable about the support shaft 33. In the trash box 1, both ends of the support shaft 33 are fulcrums 33a.
The lid body 31 on the side of the front portion 21 is provided with a handle 34 that is gripped when the lid 30 is opened and closed. Further, a pair of fixing members 50 a and 50 b for preventing the lid 30 from opening freely is attached to the handle 34 and the upper end side of the front portion 21.
The attachment portion 32 is a plate-like member, and one end 32 a thereof is fixed to the upper surface portion 24 side of the lid main body portion 31. A counterweight 40 is rotatably attached to the other end 32b of the attachment portion 32.
The position of the center of gravity of the lid 30 is the front portion 21 side of the box 20. Therefore, a moment in the direction of closing the lid body 30 (closing direction moment) is generated by the weight of the lid body 30.

The counterweight 40 is in a direction crossing a straight line connecting the main body arm portion 41 attached to the lid 30 and the attachment end 41a (first connection portion) and the tip 41b (third connection portion) of the main body arm portion 41. A control arm portion 42 extending from the main body arm portion 41 and a weight portion 43 attached to the front end 41b side of the main body arm portion 41 are provided. The counterweight 40 is provided on at least one of the axial ends of the support shaft 33. That is, the counterweight 40 is located on the side surface portion 22 side inside the box body 20.
The main body arm portion 41 is a substantially rectangular long plate member. The attachment end 41 a is rotatably attached to the other end 32 b of the attachment portion 32 of the lid body 30. In addition to the weight portion 43, a braking device 60 described later is attached to the tip 41b side.
The control arm part 42 is a substantially rectangular short plate member. The base end 42 a of the control arm portion 42 is fixed to the attachment end 41 a side of the main body arm portion 41. On the other hand, the tip (second connecting portion) 42b of the control arm 42 is attached to a control member (counter weight guide) 44 for suppressing the horizontal movement of the tip 42b.

Here, a wheel 42c is rotatably attached to the tip 42b of the control arm portion 42. The control member 44 is a substantially U-shaped member, and is fixed to the back surface portion 23 (inside the box body 20). That is, the tip 42b is attached so that the wheel 42c rolls in the region sandwiched between the control member 44 and the back surface 23.
In the trash box 1, as shown in FIG. 8, the region sandwiched between the control member 44 and the back surface portion 23 extends in the vertical direction, so the wheel 42 c moves in the vertical direction with this region as the trajectory X.
The weight and attachment position of the weight portion 43 are set according to the relationship with the weight of the lid 30 to be set and the position of the center of gravity of the counterweight 40. In the trash can 1, the position of the center of gravity of the counterweight 40 is set to the front portion 21 side of the box 20. For this reason, the weight of the counterweight 40 acts on the other end 32b of the attachment portion 32 of the lid 30 and generates a moment in the direction of opening the lid 30 (opening moment).

A brake device 60 that controls the movement of the counterweight 40 is connected to the tip (third connection portion) 41 b of the main body arm portion 41.
FIG. 10 is a schematic diagram showing the braking device 60. As shown in FIG. 10A, the braking device 60 of the trash can 1 is stretched over pulleys 61 (61a, 61b, 61c), two fixed ends 62a, 62b, and fixed ends 62a, 62. Belt 63. The pulley 61 is fixed by being sandwiched between two plates 64 (one plate 64 is omitted in FIG. 10). This plate 64 is connected to the tip 41 b of the main body arm portion 41.
In addition, the structure provided with the two pulleys 61a and 61b may be sufficient as the braking device 60, as shown to FIG. 10 (B).

Here, the pulleys 61 a and 61 c and the pulley 61 b are fixed to the plate 64 while being displaced from each other. As shown in FIG. 8, pulleys 61a and 61c are attached to the outside from the attachment end 41a to the tip 41b of the main body arm portion 41, and the pulley 61b is fixed to the inside of the pulleys 61a and 61c. A belt 63 is hung between these pulleys 61a, 61b, 61c, and the pulleys 61a, 61b, 61c move along the belt 63.
The two fixed end portions 62a and 62b are attached at positions corresponding to the trajectory along which the tip 41b of the counterweight 40 moves. Here, since the attachment end 41a of the main body arm portion 41 is rotatably attached to the other end 32b of the attachment portion 32 of the lid 30, the tip 41b of the main body arm portion 41 is centered on the attachment end 41a. Rotate. Therefore, the fixed end portions 62a and 62b are attached so that the pulleys 61a, 61b, and 61c move while contacting the belt 63 with the rotation. In the trash box 1, the fixed end portion 62 a is attached to the front surface portion 21 side of the side surface portion 22 of the box body 20, and the fixed end portion 62 b is attached to the back surface portion 23 side of the bottom surface portion 25 of the box body 20.

The belt 63 is preferably a V-belt having a trapezoidal cross section. Of the upper and lower bases of the trapezoidal shape of the belt 63, the one with the longer side is brought into contact with the pulleys 61a and 61c, and is passed over the two fixed end portions 62a and 62b. By doing in this way, the contact area of the belt 63 and pulley 61a, 61c becomes large, and the braking force by friction can be enlarged.
The length of the belt 63 is longer than the length of the straight line connecting the two fixed end portions 62a and 62b, and the belt 63 is in a relaxed state.

An operation for opening the lid 30 of the trash can 1 will be described.
FIG. 8 shows a state where the lid 30 is closed, and FIG. 9 shows a state where the lid 30 is opened.
As shown in FIG. 8, when the lid 30 is closed, the tip 41 b of the main body arm portion 41 is on the front portion 21 side, and the tip 42 b of the control arm portion 42 and the wheel 42 c are above the track X. It is in.

  Next, as shown in FIG. 9, when the lid 30 is opened, the other end 32b of the attachment portion 32 and the attachment end 41a of the main body arm portion 41 move in the lower right direction in FIG. It moves in an arc around the center). At this time, the distal end 41b of the main body arm portion 41 is rotatably attached to the other end 32b of the attachment portion 32 of the lid 30 so that the attachment end 41a of the main body arm portion 41 is rotatable. It rotates in the clockwise direction in the figure. The tip 42b of the control arm 42 cannot rotate in the clockwise direction because the track X extends in the vertical direction. Although the tip 42b can move in the vertical direction, movement in the horizontal direction (left direction in FIG. 9) is restricted. That is, when opening the lid body 30, the wheel 42 c attached to the tip 42 b moves along the track X while being urged toward the back surface portion 23 side of the box body 20. At that time, a horizontal drag in a direction opposite to the direction in which the wheel 42c is urged acts on the counterweight 40 from the back surface portion 23 side. This horizontal drag causes a moment (opening moment) that the lid 30 tries to open.

  As the lid 30 is opened, the braking device 60 causes the pulley 61 to roll on the belt 63 and move from the fixed end 62a side to the fixed end 62b side. At that time, the pulleys 61 a and 61 c are urged outwardly when the attachment end 41 a of the main body arm portion 41 is viewed as the rotation center of the counterweight 40. By this urging, the belt 63 is gradually tensioned from the relaxed state, and the rolling of the pulley 61 is stopped. As a result, the rotation of the counterweight 40 is controlled, and the opening operation of the lid 30 is further controlled.

According to the present embodiment, the following effects can be achieved.
(1) By causing the wheel 42c to move along the track X formed by the control member 44 and the back surface portion 23, a horizontal drag is generated against the counterweight 40, and the opening direction of the lid 30 due to this drag is generated. Moments can be generated. The moment resulting from this drag, the closing moment of the lid 30 and the opening moment by the counterweight 40 are caused to act on the lid 30 so that the lid can be easily opened and closed. At the same time, the lid can be opened and closed at a stable speed.

(2) Since the brake device 60 is provided at the tip 41b of the main body arm portion 41, the opening operation of the lid 30 can be controlled smoothly, and a simple configuration using the pulley 61 and the belt 63 is provided. The braking force can be generated with.
Furthermore, if a chain or a wire is used instead of the belt 63, the pulley 61 produces a large noise during rolling and low durability, but the belt 63 produces a small noise during rolling and is excellent in durability.

(3) Since the counterweight 40 is located on the side surface portion 22 side inside the box body 20, it is possible to secure a wide space inside the box body 20 and prevent contact with an object accommodated inside the box body 20. You can also.

(4) The movement of the lid 30 can be controlled by controlling the position of the tip 42 b of the control arm 42 by the control member 44. In the case of a single-open structure such as the trash can 1, a space for installing a mechanical mechanism is hardly obtained on the attachment portion 32 side of the lid 30, but the space on the gravity center side of the lid 30 can be utilized. .

[Modification of Embodiment]
In addition, this invention is not limited to embodiment mentioned above, The deformation | transformation as shown below is also included.
In the above-described embodiment, the position of the counterweight 40 to be connected to the lid body 30 is the attachment end 41a. However, the position is not limited to the end portion as described above, and the first connection portion may be connected at other positions.
In the above embodiment, the braking device 60 is configured using the pulley 61 and the belt 63, but is not limited thereto, and the rotation of the tip 41b of the main body arm portion 41 is controlled by a spring mechanism or a cylinder mechanism. Also good.

Furthermore, the braking device may be configured as follows as a braking device for suppressing the rotation of the structure that is pivotally supported. First, the braking device includes at least two pulleys provided at positions distant from the pivotally supported position of the structure BDC, and two fixed end portions set outside the rotation range of the structure BDC. And a belt for connecting the two fixed ends to each other. The length of the belt is longer than the length of a line segment connecting the two fixed ends, and the belt is wound around the at least two pulleys. In this braking device, the movement trajectory of the at least two pulleys when the structure BDC rotates and the elliptical trajectory having the two fixed ends as the focal points intersect at at least one point. .
Here, the trajectory drawn in a state where tension is applied to the belt longer than the length of the line segment connecting the two fixed ends becomes an elliptical trajectory having the two fixed ends as focal points. In addition, when the structure BDC rotates with the opening operation of the structure AOB, the pulley has a belt that is longer than the length of the line connecting the two fixed ends, and is wound around the pulley. , Move while rolling on the belt. And since the movement trajectory of the pulley and the elliptical trajectory intersect, when the pulley moves and is located on the elliptical trajectory, tension is applied to the belt, and the belt is in a tensioned state from a relaxed state And the rolling of the pulley is suppressed. Further, when the structure BDC tries to rotate in accordance with the opening operation of the structure AOB, the tension applied to the belt increases, and the rolling of the pulley is more strongly suppressed. Since the rolling of the pulley is suppressed, the rotation of the structure BDC is suppressed, and as a result, the opening operation of the structure AOB is stopped. This braking device is excellent in durability and can sufficiently brake a sudden opening / closing operation of the lid.
In this braking device, it is preferable that at least one of the at least two pulleys is formed with a groove in which the belt can be engaged. When such a groove is formed, when tension is applied to the belt, the belt is more strongly engaged with the pulley than when no groove is formed, and the pulley is in contact with the belt. Since the area is large, the frictional force is increased and the braking force of the braking device can be increased.

  The lid opening / closing device of the present invention can be used to open / close lids provided in trash bin lids, piano keyboard lids, and floor (slab) openings (hatch).

DESCRIPTION OF SYMBOLS 10 ... Lid opening / closing device 30 ... Lid 32 ... Attachment part 32a ... One end 33 ... Support shaft 33a ... Supporting point 40 ... Counterweight 41 ... Main body arm part 41a ... Attachment end (1st connection part)
41b ... tip (third connecting portion)
42b ... tip (second connecting portion)
60 ... braking device 61 (61a, 61b, 61c) ... pulleys 62a, 62b ... fixed end 63 ... belt X ... track

Claims (7)

A lid that is rotatably supported with a position other than the center of gravity as a fulcrum when viewed in cross section;
A counterweight that exerts its own weight on the opposite side of the center of gravity of the lid and the fulcrum, and
The counterweight is composed of a rigid body,
The counterweight is rotatably connected to a position away from the fulcrum of the lid at the first connecting portion other than the center of gravity of the counterweight,
Except for the position of the center of gravity of the counterweight, the second connecting portion of the counterweight, which is different from the first connecting portion, moves along a track that generates a drag force in the horizontal direction with respect to the counterweight. A lid opening and closing device characterized by being connected. The lid opening / closing device according to claim 1,
An angle formed by a line connecting the center of gravity of the cover and the fulcrum and a line connecting the first connecting portion and the fulcrum is less than 180 degrees vertically downward. Switchgear. The lid opening / closing device according to claim 1 or 2,
The track | orbit of the said 2nd connection part is extended in the perpendicular direction, The cover body opening / closing apparatus characterized by the above-mentioned. The lid opening / closing device according to any one of claims 1 to 3,
Having a support axis perpendicular to the cross section and passing through the fulcrum,
The lid opening / closing apparatus according to claim 1, wherein the counterweight is provided on at least one of axial ends of the support shaft. The lid opening / closing device according to any one of claims 1 to 4,
A third connection portion of the counterweight different from the first connection portion and the second connection portion is connected to a braking device that controls the rotation of the counterweight according to the rotation angle of the lid. A lid opening / closing device. The lid opening / closing device according to claim 5,
The braking device includes at least two or more pulleys, and a belt that is stretched over two fixed ends that are set outside the rotation range of the third connecting portion,
The lid opening / closing device, wherein the braking device rolls the at least two pulleys on the belt when the lid and the counterweight rotate. The lid opening / closing device according to claim 6,
The lid opening / closing device, wherein a length of the belt is longer than a length of a line connecting the two fixed ends.

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