JP7227492B2 - Opening and closing mechanism - Google Patents

Description

The present invention relates to an opening/closing mechanism.

When a lid open/close button disposed in a horizontally long concave portion provided in the upper lid is pressed down, the pressing portion presses down the receiving piece to rotate the hook, the locking pawl disengages from the locking portion, and the lid body. A rice cooker that opens around a hinge portion has been proposed in the past (see, for example, Japanese Unexamined Patent Application Publication No. 2007-75411).

JP 2007-75411 A

By the way, the shape of the open/close button is various in consideration of the design. However, in the horizontally long open/close button, even if the end side of the open/close button is pushed down, the open/close button may be tilted and the lid may not be opened. This is because the protrusion that presses the pressed portion is provided only in the central portion of the open/close button, and when the central portion of the open/close button is pressed down, the protrusion presses the pressed portion, but the edge of the open/close button is pressed. This is because the projecting portion may not press the pressed portion when the side is pressed down. If the cover cannot be opened by pushing down the end side of the open/close button, it is necessary to push down the central portion of the open/close button again. Further, when the projecting portion and the pressed portion are integrated, by pressing the open/close button, the open/close button draws a circular orbit with the pressed portion around the axis. As a result, it is necessary to provide a space for drawing a circular orbit, which significantly impairs the design.

SUMMARY OF THE INVENTION An object of the present invention is to provide an opening/closing mechanism that can stably open a lid even when the end side of a laterally long opening/closing button is pushed down and that does not impair the design.

The opening and closing mechanism according to the present invention includes:
an open/close button that can be pressed;
a locking member having a locking portion and biased upward by the biasing portion;
The open/close button has at least three projections,
The locking member further has a pressed portion that is pressed by at least one of the protrusions when the open/close button is pressed,
The projecting portion is arranged to face the pressed portion,
The hooking portion rotates in the opening direction when the pressed portion is pushed down.

According to the above configuration, it is possible to increase the number of locations where the protrusion presses the pressed portion. For this reason, in this opening/closing mechanism, by arranging protrusions not only in the central portion of the opening/closing button but also on the end sides thereof, it is possible to open the cover even when the edge side of the opening/closing button is pushed down.

In the present invention,
The open/close button has a horizontally long shape,
The locking member is pivotally supported by a shaft,
It is preferable that the protrusion is arranged along the longitudinal direction of the open/close button and substantially parallel to the axis.

According to the above configuration, the protrusions are arranged in the longitudinal direction of the open/close button, and even if the end side of the open/close button is pushed down, the protrusions on the end side press the pressed portion. Therefore, this opening/closing mechanism can stably open the lid.

In the present invention,
It is preferable that the projecting portion is arranged so that the distance from the pressed portion increases toward both ends from the central portion of the open/close button.

According to the above configuration, when the end side of the open/close button is pushed down, not only the end-side protrusions but also the central protrusions can press the pressed portion. Therefore, with this opening/closing mechanism, the lid can be opened more stably.

In the present invention,
It is preferable that the distance between the at least three protrusions and the pressed portion is shorter as the protrusions are arranged closer to the center.

According to the above configuration, when the protrusion on the end side presses the pressed portion, not only the protrusion on the end side but also the protrusion on the center side can press the pressed portion. Therefore, with this opening/closing mechanism, the lid can be opened more stably.

BRIEF DESCRIPTION OF THE DRAWINGS It is a front view of the rice cooker which concerns on embodiment of this invention. FIG. 2 is a sectional view taken along line II of FIG. 1; 1 is an upper exploded perspective view of an opening/closing mechanism that constitutes a rice cooker according to an embodiment of the present invention; FIG. Fig. 2 is a bottom exploded perspective view of an opening/closing mechanism that constitutes the rice cooker according to the embodiment of the present invention; Figure 5 is a bottom view of the button cover of Figures 3 and 4; Figure 5 is a bottom view of the button body of Figures 3 and 4; Fig. 3 is a plan view showing the inside of the lid constituting the rice cooker according to the embodiment of the present invention;

<Structure of the rice cooker according to the embodiment of the present invention>
A rice cooker 100 according to an embodiment of the present invention is an induction heating pressure rice cooker, and as shown in FIGS. It consists of a mechanism 150 . These constituent elements are described in detail below.

1. Main Body Main body 110, as shown in FIGS. It consists of a panel 117 , a power supply circuit board 118 , a control circuit board 119 and an automatic winding type power cord unit 120 . These constituent elements are described in detail below.

(1) Housing The housing 111, as shown in FIGS. ), an induction heating coil 113, a thermistor 114, a blower fan 115, a heat sink 116, a power circuit board 118, a control circuit board 119, an automatic winding type power cord unit 120, and the like. An operation panel 117 is arranged on the upper front side of the shoulder member 111c. Each component of the housing 111 will be described in detail below.

The side wall 111a is a substantially rectangular enclosing wall that covers the sides of the main body 110 as shown in FIGS.

The bottom wall 111b is a substantially square plate-like body and is fitted under the side wall 111a as shown in FIGS. 1 and 2 to cover the opening on the bottom side of the side wall 111a. As shown in FIG. 2, the bottom wall 111b has an intake port Os for sucking in the air outside the housing 111 and an air intake port Os for discharging the air inside the housing 111 to the outside. An exhaust port (not shown) is formed. In addition, as shown in FIG. 2, a blower fan 115 is arranged directly above the intake port Os. When the blower fan 115 is driven, external air is sucked into the housing 111 through the air intake port Os, and the air flow generated thereby causes the heated air inside to be discharged out of the system through the exhaust port.

The shoulder member 111c is a substantially rectangular frame, and is fitted on the upper side of the side wall 111a as shown in FIGS. 1 and 2 to cover the edge of the upper opening of the side wall 111a. As shown in FIG. 2, a protective frame 111d is attached to the lower side of the shoulder member 111c. In addition, as shown in FIG. 2, the protection frame 111d is attached to the shoulder member 111c with a protection frame flange portion FP (described later).

The protective frame 111d is a member that protects the outer circumference of the inner pot 130 and keeps the shape of the shoulder member 111c.As shown in FIG. It is formed from FP. The inner pot housing portion PA is a bowl-shaped portion that covers the outer circumference of the inner pot 130 . As described above, the protective frame flange portion FP is arranged below the shoulder member 111c and maintains the shape of the shoulder member 111c by stretching the shoulder member 111c outward.

(2) Handle The handle 112 is a member provided for the user to carry the rice cooker 100 by hand, and is composed of a body (not shown) and a shaft (not shown). The main body is U-shaped. The shaft extends inwardly from both ends of the body. In addition, in this rice cooker 100, the shaft portion passes through a hole (not shown) formed in the upper portion of the longitudinal center of the side wall 111a, and a fitting portion (not shown) formed in the protective frame 111d. is mated to

(3) Heat Insulating Material The heat insulating material is wrapped around the side wall of the inner pot housing portion PA of the protective frame 111d and the outer periphery of the induction heating coil 113, and the heat generated from the inner pot 130 during rice cooking is transferred to the outside of the inner pot housing portion PA. It plays a role in suppressing the outflow of

(4) Induction Heating Coil The induction heating coil 113 is an induction heating source for induction-heating the inner pot 130, and as shown in FIG. is located outside the

(5) Thermistor The thermistor 114 is a temperature sensor, and as shown in FIG. protruding. The thermistor 114 is biased upward by a biasing member such as a coil spring. In other words, the thermistor 114 is arranged to be movable in the vertical direction. Also, this thermistor 114 is incorporated in an inner pot detection sensor (not shown). The inner pot detection sensor is for judging whether or not the inner pot 130 is present in the rice cooker. do. Upon receiving the detection signal, the microcomputer determines that the inner pot 130 is present in the rice cooker. Note that when the microcomputer determines that the inner pot 130 does not exist in the rice cooker, the rice cooking operation is not started. By the way, the thermistor 114 is supported by a substantially disk-shaped cover member 127 as shown in FIG. The cover member 127 is screwed to the bottom wall of the inner pot housing portion PA of the protective frame 111d.

(6) Blower Fan As described above, the blower fan 115 is disposed directly above the intake port Os formed in the bottom wall 111b of the housing 111 so that the rotation axis extends substantially in the vertical direction (Fig. 2). That is, when the blower fan 115 is driven, outside air is sucked from the intake port Os, flows into the housing, and is sent upward as it is. The external air sent upward passes through the heat sink 116 and is supplied to the power circuit board 118, the control circuit board 119, and the like to cool these members.

(7) Heat Sink The heat sink 116 is a component that efficiently exchanges heat with the outside air.

(8) Operation Panel The operation panel 117 is for determining and executing the operation method of the rice cooker 100, and as shown in FIGS. etc., and is arranged above the front side of the shoulder member 111c as described above.

(9) Power Supply Circuit Board The power supply circuit board 118 is a board that constitutes a power supply circuit, and several heat-generating components are mounted thereon. The power supply circuit board 118 is accommodated in the front space SPf of the housing 111, like the control circuit board 119, which will be described later.

(10) Control Circuit Board The control circuit board 119 is a board constituting a control circuit, and has electronic components such as a microcomputer mounted thereon. This control circuit board 119 is accommodated in the front space SPf of the housing 111 as shown in FIG.

(11) Automatic winding power cord unit The automatic winding power cord unit 120 is composed of a power cord, an automatic winding mechanism (not shown), etc., and is attached to the housing 111 as shown in FIG. It is housed in the rear space. The power cord consists of a plug (not shown) and an electric wire (not shown). A plug (not shown) is provided at the tip of the electric wire. The electric wire is extendably wound around an automatic winding mechanism.

2. Inner Pot The inner pot 130 is a bowl-shaped pot that opens upward, is inserted through the opening of the shoulder member 111c, and is accommodated in the inner pot accommodating portion PA of the protective frame 111d with a predetermined gap. Here, the inner pot 130 is a multi-layer body (clad material) of various aluminum alloys and stainless alloys, and can be induction-heated by the induction heating coil 113 .

3. Lid Body The lid body 140 is mainly composed of an outer body 141, an opening/closing mechanism 142, a pressure adjusting mechanism 143, a reinforcing member (not shown), and an inner lid 145, as shown in FIGS. . Lid 140 is rotatably attached to main body 110 via hinge mechanism 150 .

(1) Exterior Body As shown in FIGS. 1 and 2, the exterior body 141 is a substantially rectangular parallelepiped member and accommodates the open/close button assembly 142a, the pressure adjustment mechanism 143, the lever member 146, and the like. . 1 and 2, the button cover 142b is arranged on the exterior body 141 so that the upper surface thereof is exposed above the exterior body 141. As shown in FIGS. Also, here, the exterior body 141 is reinforced with a reinforcing member so as to withstand the internal pressure during use. An inner lid 145 is detachably provided on the lower surface of the exterior body 141 .

(2) Opening and Closing Mechanism The opening and closing mechanism 142 mainly comprises an opening and closing button assembly 142a, an opening and closing button support 142e, a second coil spring 142f and a lever member 146, as shown in FIGS.

The open/close button assembly 142a, as shown in FIGS. 3 and 4, mainly comprises a button cover 142b, a button body 142c and a first coil spring 142d. The button cover 142b is urged upward by a pair of first coil springs 142d arranged at both ends of the button main body 142c in the longitudinal direction in plan view.

As shown in FIGS. 3 to 5, the button cover 142b has a rounded rectangular shape with peripheral walls, and is arranged in the vicinity of both ends on a line along the longitudinal direction passing through the center in the short side direction when viewed from the bottom. It has a pair of insertion rods 142g and four engaging claw portions Na extending downward from the longitudinal peripheral wall. The insertion rod 142g passes through an upper insertion hole HLa (described later) of the button body 142c and a lower insertion hole HLb (described later) of the open/close button support 142e when the button cover 142b is not pushed down. Also, the insertion rod 142g is interposed by a first coil spring 142d and a second coil spring 142f (described later). The engaging claw portion Na is engaged with an engaging claw receiving hole (not shown) formed in the exterior body 141 when the button cover 142b is not pushed down. Therefore, the button cover 142b is not pushed out from the exterior body 141 by the biasing force of a coil spring (not shown) installed below the coil spring contact portion 146f of the lever member 146, which will be described later.

As shown in FIGS. 3, 4 and 6, the button body 142c has a pair of upper through-holes HLa at both ends on a line passing through the center in the lateral direction, and a pair of upper through-holes HLa on the lower surface. are provided with protrusions Pa, Pb and Pc between the pair of upper insertion holes HLa. Further, the button body 142c is biased upward by a pair of second coil springs 142f disposed at both ends in the longitudinal direction of an opening/closing button support 142e (described later) in a plan view. When the button cover 142b is pushed down by the user, the button body 142c is pushed down together with the button cover 142b against the biasing force of the second coil spring 142f. The arrangement direction of the protrusions Pa, Pb, and Pc is substantially parallel to a shaft (not shown) inserted through a bearing hole 146e that pivotally supports a lever member 146, which will be described later. When the button cover 142b is not pushed down, the protrusion Pa is designed to slightly contact the pressed portion 146b, and the protrusions Pb and Pc are designed not to contact the pressed portion 146b. Designed.

As shown in FIGS. 3 and 4, the opening/closing button support 142e has a pair of lower insertion holes HLb at both ends on a line passing through the center in the widthwise direction along the lengthwise direction. 3 and 4, an opening OP is formed in the open/close button support 142e. A pressed portion 146b (described later) of the lever member 146 is inserted into the opening OP.

As described above, the insertion rod 142g of the button cover 142b passes through the upper insertion hole HLa of the button body 142c and the lower insertion hole HLb of the open/close button support 142e when the button cover 142b is not pushed down. In other words, the button cover 142b is designed so that when pushed down by the user, the button cover 142b is allowed to tilt within a certain range but does not tilt excessively.

As shown in FIGS. 3 and 4, the lever member 146 includes a body portion 146a, a pressed portion 146b, an extended plate portion 146c, a claw portion 146d, and a coil spring contact portion 146f. As shown in FIG. 3, the pressed portion 146b extends upward from the rear side of the central portion of the body portion 146a and then extends rearward. facing. The extension plate portions 146c extend downward from the front side of the body portion 146a and are a pair of left and right. The claw portion 146d extends rearward from the lower portion of each extended plate portion 146c. As shown in FIG. 3, the coil spring contact portion 146f extends upward from the rear side of the right end portion of the body portion 146a and then extends rearward. The lever member 146 is a metal plate member, and is pivotally supported on the exterior body 141 by shafts (not shown) that pass through the pair of left and right bearing holes 146e. It is biased upward by a coil spring (not shown). Note that the pressed portion 146b is designed to be positioned rearward of the shaft that passes through the pair of left and right bearing holes 146e.

When the user wants to close the lid 140 , the user does not need to operate the opening/closing mechanism 142 , and just push the lid 140 toward the main body 110 . At this time, the claw portion 146d of the lever member 146 moves downward while contacting an inclined surface (not shown) formed on the shoulder member 111c. During this time, the extended plate portion 146c and the claw portion 146d of the lever member 146 rotate forward against the biasing force of the coil spring (not shown) installed below the coil spring contact portion 146f. When the claw portion 146d reaches a claw receiving hole (not shown) formed in the shoulder member 111c, the claw portion 146d is pushed into the claw receiving hole by the biasing force of the coil spring installed below the coil spring contact portion 146f. fit into. In this manner, the lid 140 is closed. On the other hand, when opening the lid body 140, the user pushes down the button cover 142b. When the user pushes down the central portion of the button cover 142b, the button body 142c is pushed down together with the button cover 142b against the biasing force of the second coil spring 142f. At this time, the projecting portion Pa of the button body 142c presses the pressed portion 146b of the lever member 146, and the extended plate portion 146c and claw portion 146d of the lever member 146 are placed below the coil spring contact portion 146f. It rotates forward against the biasing force of the coil spring. At this time, the claw portion 146d fitted in the claw receiving hole is pulled out from the claw receiving hole. Then, the lid 140 is lifted upward by the biasing force of the hinge mechanism 150, and the lid 140 is opened. Also, when the user pushes down the end side of the button cover 142b, the button body 142c is pushed down together with the button cover 142b against the biasing force of the second coil spring 142f. At this time, not only one of the protrusion Pb and the protrusion Pc of the button body 142c but also the protrusion Pa presses the pressed portion 146b of the lever member 146. The claw portion 146d rotates forward against the biasing force of the coil spring installed below the coil spring contact portion 146f. At this time, the claw portion 146d fitted in the claw receiving hole is pulled out from the claw receiving hole. Then, the lid 140 is lifted upward by the biasing force of the hinge mechanism 150, and the lid 140 is opened.

(3) Pressure Adjustment Mechanism The pressure adjustment mechanism 143 is a mechanism that adjusts the pressure inside the inner pot 130 to 1.03 to 1.3 atm when the lid 140 is closed and the rice is cooked under pressure. It is mainly composed of a pressure adjusting ball (not shown), a pressure adjusting ball accommodating portion 143a, a reciprocating actuator 143b and an operating rod 143c. The pressure regulating ball is accommodated in the pressure regulating ball accommodating portion 143a, and is arranged above a pressure regulating hole (not shown) formed in the lower exterior member 141b. When the pressure adjusting ball is not pushed by the push rod portion (not shown) of the action rod 143c, the pressure adjusting ball sits on the valve seat so as to close the pressure adjusting hole and adjusts the internal pressure of the inner pot 130 (the inner pot When the internal pressure of 130 reaches or exceeds a predetermined value, the pressure regulating ball is pushed up to temporarily reduce the internal pressure.), and the pressure regulating hole is always opened while being pushed by the push rod. The reciprocating actuator 143b is an electromagnetic piston using a solenoid, and as shown in FIG. 7, an action rod 143c is attached to the tip of the piston PT. Here, when the piston PT of the reciprocating actuator 143b moves backward, the working rod 143c moves forward, and when the piston PT of the reciprocating actuator 143b moves forward, the working rod 143c moves backward. Then, when the working rod 143c moves forward, the pressure regulating ball is seated on the valve seat so as to close the pressure regulating hole (that is, the pressure rice cooking operation state is entered), and the opening/closing lock portion ( (described later) RC restricts the pivotal movement of the lever member 146 so that the lid body 140 does not open. On the other hand, when the operating rod 143c moves rearward, the pressure adjusting ball is pushed away from the pressure adjusting hole by a push rod portion (described later) of the operating rod 143c, so that the pressure adjusting hole is always opened, and the operating rod 143c opens and closes. The restriction of the pivoting movement of the lever member 146 by the lock portion RC is released, and the lid body 140 is opened. As shown in FIG. 7, the working rod 143c is mainly composed of a push rod portion, an extension portion EP and an opening/closing lock portion RC. The push rod part is retractable in the pressure regulation ball accommodating part 143a, and as described above, has a function of pushing the pressure regulation ball to always open the pressure regulation hole except during the pressure rice cooking operation. The extended portion EP is a portion that physically connects the push rod portion and the open/close lock portion RC, and has a substantially L shape in plan view. As shown in FIG. 7, the opening/closing lock portion RC is a portion provided at the front end of the extended portion EP, and is movable in and out of a gap below the coil spring contact portion 146f of the lever member 146. . The opening/closing lock portion RC enters the above-described gap during the pressure cooking operation, that is, when the working rod 143c moves forward, and is pulled out from the above-described gap when the working rod 143c moves rearward. . In this embodiment, the pressure adjusting mechanism is not particularly limited, and a conventional one may be employed.

(4) Reinforcing Member The reinforcing member is for enhancing the strength of the lid body 140 . In the present embodiment, the reinforcing member is not particularly limited, and may be a metal plate itself or a metal plate having a complicated shape.

(5) Inner Lid The inner lid 145 is a member for covering and sealing the upper portion of the inner pot 130 as shown in FIG.

4. Hinge Mechanism As described above, the hinge mechanism 150 attaches the lid 140 to the main body 110 so that the lid 140 is rotatable relative to the main body 110 . As described above, the hinge mechanism 150 biases the lid 140 in the opening direction.

<Characteristics of Open/Close Button Assembly According to Embodiment of the Present Invention>
(1)
In the button main body 142c according to the embodiment of the present invention, the protrusion Pa is arranged in the center of the bottom surface of the button main body 142c. Projections Pb and Pc are provided on the lower surface of the button body 142c so as to come into contact with the end side of the pressed portion 146b when the button cover 142b and the button body 142c are pushed down together with the button cover 142b. are arranged. In addition, when the button cover 142b is not pushed down, the projection Pa is designed to slightly contact the pressed portion 146b, and the projections Pb and Pc are designed not to come into contact with the pressed portion 146b. Designed. Therefore, in this open/close button assembly 142a, when the central portion of the button cover 142b is pushed down, the projecting portion Pa of the button body 142c pushes the pressed portion 146b, and when the end side of the button cover 142b is pushed down, the button is pressed. Not only one of the protrusion Pb and the protrusion Pc of the main body 142c but also the protrusion Pa presses the pressed portion 146b. Therefore, in this open/close button assembly 142a, when the cover 140 does not open even when the end side of the button cover 142b is pushed down, there is no need to push down the central part of the button cover 142b again, and any position of the button cover 142b can be pushed down. can open lid 140 of rice cooker 100.

(2)
The button cover 142b according to the embodiment of the present invention employs oblong buttons. Therefore, this button cover 142b is excellent in design.

<Modification>
(A)
Button main body 142c according to the previous embodiment has protrusions Pa, protrusions Pb, and protrusions Pc, but the number of protrusions to be provided is not particularly limited, and may be three or more. In such a case, the protrusion is preferably designed such that the distance between the protrusion and the pressed portion 146b increases from the center toward both ends of the bottom surface of the button body 142c.

(B)
In the button main body 142c according to the previous embodiment, the projection Pa was arranged at the center of the bottom surface of the button main body 142c, but the projection Pa does not have to be arranged at the center. In such a case, the protrusion Pa may be arranged between one of the protrusions Pb and Pc and the center of the bottom surface of the button body 142c. In that case, it is preferable that another protrusion is arranged symmetrically across the center of the lower surface of the button body 142c. Incidentally, it is preferable that the protrusion Pa be arranged closer to the center of the lower surface of the button body 142c than to be closer to either one of the protrusions Pb and Pc.

(C)
In the open/close button assembly 142a according to the previous embodiment, when the button cover 142b is not pushed down, the projecting portion Pa of the button body 142c is designed to slightly contact the pressed portion 146b. , the length of the protrusion Pa may be designed so as not to contact the pressed portion 146b. In this case, the distance between the projection Pb of the button body 142c and the pressed portion 146b and the distance between the projection Pc of the button body 142c and the pressed portion 146b are longer than the distance between the projection Pa and the pressed portion 146b. should be designed to

(D)
In the button body 142c according to the previous embodiment, the projections Pa, Pb, and Pc are arranged on the bottom surface of the button body 142c along a line along the longitudinal direction passing through the center in the short direction. Three portions Pa, Pb and Pc may be arranged on a line along the longitudinal direction passing through other than the center in the lateral direction on the lower surface of the button body 142c.

(E)
In the button body 142c according to the previous embodiment, the protrusions Pa, Pb, and Pc have a substantially semi-cylindrical shape. It may be in shape.

(F)
Although the button cover 142b according to the previous embodiment employs a rectangular button cover with rounded corners, the shape of the button cover may be any shape other than a vertically long shape. For example, it may be rectangular, elliptical, or star-shaped. In such a case, the shape of the button body or the opening/closing button support may be adjusted according to the shape of the button cover to be adopted.

(G)
In the open/close button assembly 142a according to the previous embodiment, the button cover 142b, the button main body 142c, and the first coil spring 142d can be disassembled. An open/close button assembly may be employed.

(H)
The lever member 146 according to the previous embodiment was urged upward by one coil spring installed below the coil spring contact portion 146f, but the other rear end portion of the body portion 146a also has a coil spring. A contact part may be provided and a coil spring may be installed on the lower side.

(I)
Although the present invention is applied to a rice cooker in this embodiment, the present invention can be applied to any electrical appliance or container having a lid that is rotatable relative to the main body and has an open/close button, such as a home bakery, humidifier, It may be applied to electric kettles, pots and the like.

142: Opening/closing mechanism 142a: Opening/closing button assembly (opening/closing button)
146: Lever member (locking member)
146b: Pressed portion 146d: Claw portion (hanging portion)
146e: bearing holes Pa, Pb, Pc: protrusions

Claims (4)

an open/close button that can be pressed;
a locking member having a locking portion and biased upward by the biasing portion;
The open/close button has at least three projections,
The locking member further has a pressed portion that is pressed by at least one of the protrusions when the open/close button is pressed,
The projecting portion is arranged to face the pressed portion,
An opening/closing mechanism, wherein the hooking portion rotates in an opening direction when the pressed portion is pushed down. The open/close button has a horizontally long shape,
The locking member is pivotally supported by a shaft,
2. The opening/closing mechanism according to claim 1, wherein the protrusion is arranged along the longitudinal direction of the opening/closing button and substantially parallel to the axis. 3. The opening/closing mechanism according to claim 1, wherein said protrusion is arranged such that the distance from said pressed portion increases from the central portion of said opening/closing button toward both ends thereof. 4. The opening/closing mechanism according to any one of claims 1 to 3, wherein the at least three protrusions are arranged closer to the center side and have a shorter distance from the pressed portion.

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