JP3597424B2 - Door opening and closing mechanism - Google Patents

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a door opening / closing mechanism provided on a door of a refrigerator or the like, and more particularly, to a door opening / closing mechanism provided with means for separating a door from a periphery of an opening by a predetermined distance.
[0002]
[Prior art]
As a conventional door opening / closing mechanism of this type, for example, a mechanism disclosed in Japanese Patent Application Laid-Open No. 10-73367 is known. FIG. 12 is a plan sectional view of the door opening / closing mechanism, and FIG. 13 is a side sectional view. As shown in the figure, the door opening / closing mechanism 100 is provided on a door 300 that opens and closes the opening by coming into contact with and separating from the periphery of the opening provided in the cabinet 200. A gasket 400 is provided on the inner peripheral edge of the door 300, and the gasket 400 is fixed around the opening of the cabinet 200 by a magnet 500 built in the gasket 400.
[0003]
The door opening / closing mechanism 100 includes inner and outer handles 110 and 111 provided on one side of a door 300, a handle member 120 rotatably hinged to one side of the inner and outer handles 110 and 111, A rotating cam 130 hinged to the inner and outer handles 110 and 111 so as to perform a seesaw motion by a force holding down the handle member 120, and is provided on an inner surface of the door 300 while being slid by the seesaw motion of the rotating cam 130. The slide shaft 140 provided on the inner and outer handles 110 and 111 so as to separate magnetic contact between the gasket 400 and the cabinet 200, and when the pressing operation of the handle member 120 is released, the slide shaft 140 is returned to its original state, The rotary cam 130 is returned to the original state by the slide shaft 140 It consists spring 150. provided to the inner and outer handles 110 and 111 cause.
[0004]
When the user takes the inner and outer handles 110, 111 to open the door 300 and presses the handle member 120, the handle member 120 is moved to the hinge at one end hingedly connected to the outer ends of the inner and outer handles 110, 111. The push protrusion 122 on the other end is rotated about the protrusion 121 so as to be inserted deeply into the inside handle 110 and the outside handle 111.
[0005]
At this time, the push protrusion 122 rotates the first contact protrusion surface 132 of the rotating cam 130 hinged via the hinge pin 131 inside the connection between the inner handle 110 and the outer handle 111 in a counterclockwise direction in FIG. When pressed, the second contact projection surface 133 protruding from the circumferential surface of the rotating cam 130 at a position corresponding to the first contact projection surface 132 is simultaneously rotated in the counterclockwise direction.
[0006]
As a result, the slide shaft 140 is pushed by the second contact protrusion surface 133, but the slide shaft 140 performs a forward slide operation by the contact surface 141 having a large area on the front end side contacting the front side of the cabinet 200. As a result, the door 300 is opened at a predetermined distance from the cabinet 200 so that the mutual contact surface between the cabinet 200 and the gasket 400 is separated at a predetermined distance H by the stopping operation of the slide shaft 140, and the door 300 is opened only by the width of the opened door 300. A spring 150 provided at the rear end of the slide shaft 140 hits a spring locking projection 142 protruding from the rear end of the slide shaft 140 and is compressed.
[0007]
Then, when the user pulls the inner and outer handles 110 and 111 held in the hands, the door 300 can be opened with a small force without being affected by the magnetic force of the magnet 500.
[0008]
[Problems to be solved by the invention]
However, the above-described conventional door opening and closing mechanism requires a large grip force to open the door 300 at a predetermined interval first, and has a problem that it is difficult for a person with a weak grip force to operate.
Further, even if the user pulls the handle member 120 with his / her weight, the grip force of the fingertip is considerably required, and it is difficult to release with the weight.
[0009]
In order to reduce the operating force, the position of the first contact projection surface 132 of the rotating cam 130 must be longer than the hinge pin 131. However, in this case, the entire rotating cam 130 becomes large, making the design unsightly. In addition, there is a problem that the handle member 120 needs to be largely moved, and the operability is deteriorated.
[0010]
Further, the position at which the slide shaft 140 pushes the cabinet 200 is structurally limited to the vicinity of the door handle opening / closing means 100, and there is a problem in that the design is restricted.
[0011]
The present invention has been made to solve the above-described problems, and an object of the present invention is to provide a door opening / closing mechanism capable of opening a door with a small operation force and improving the design. It is in.
[0012]
[Means for Solving the Problems]
In order to achieve the above-mentioned object, the present invention provides a door opening / closing mechanism provided on a door that opens and closes the opening by coming into contact with and separating the periphery of the opening, and an operation unit that is gripped when the door is opened. A handle having the same axis direction as the rotation axis of the door and being rotatably provided by a support shaft disposed closer to the center of the door than the operation unit. When the lever acts as a fulcrum, it is formed integrally with the handle by extending in a direction opposite to the operating portion with respect to the support shaft when viewed in plan from the axial direction of the support shaft. By gripping and pulling the operating portion , the point of action pivots and presses around the opening, and the door pivots in the same direction as the handle to separate a predetermined distance from the periphery of the opening. It is characterized by being performed.
Further, the present invention is a door opening / closing mechanism provided on a door that opens and closes the opening by sliding toward and away from the periphery of the opening by sliding back and forth. A handle having an operation unit disposed substantially at the center in the left-right direction and having an axial direction disposed below the operation unit rotatably provided by a support shaft in the left-right direction, and using the operation unit as a power point A lever acting point having the support shaft as a fulcrum is formed integrally with the handle so as to extend in a direction opposite to the operation portion with respect to the support shaft when viewed in a plan view from the axial direction of the support shaft, and is formed integrally with the handle. At the time of opening, the operating point is rotated by pressing and gripping the operation unit to press around the opening, and the door slides forward and is separated from the periphery of the opening by a predetermined distance. It is characterized by that.
[0013]
According to such a configuration, the lever can be used to open the door at a predetermined interval with a small operating force, and the position of the lever can be separated from the position of the operating point, so that the operating point is less noticeable. It can be set at a location and the degree of freedom of design increases, making it possible to perform beautiful design processing.
[0014]
The distance from the lever to the fulcrum is preferably longer than the distance from the fulcrum to the point of application.
[0015]
In addition, it is preferable that the position of the lever fulcrum is located closer to the center of the door than the position of the force point, and the direction of the force applied to the force point coincides with the opening direction of the door, because the door is easily opened.
[0016]
Further, it is preferable that the position of the lever is located below or to the side of the door, since the point of application becomes particularly inconspicuous.
[0017]
When the door has a handle rotatably attached to the door via a rotation shaft, the handle is formed such that a finger is inserted from the free end side to the back side of the operation unit to be operated. At the same time, it is preferable that the operation portion be formed so that a finger can be put on the back surface side of the operation portion from the rotation shaft side to perform the operation.
[0018]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, specific embodiments of the present invention will be described with reference to the drawings.
1 is a front view of a refrigerator provided with a door opening / closing mechanism of the present invention, FIGS. 2 to 8 show a first embodiment of the present invention, FIG. 2 is an enlarged view of a portion A in FIG. 1, and FIG. 1, FIG. 4 is a sectional view taken along line CC of FIG. 1, FIG. 5 is a sectional view taken along line DD of FIG. 1, FIG. 6 is a sectional view taken along line EE of FIG. 7 is a view showing a state in which the handle of FIG. 5 is pulled, and FIG. 8 is an enlarged view of a main part of FIG. 6, showing an operation of the arm when the handle is pulled.
[0019]
The refrigerator shown in FIG. 1 has a box-shaped cabinet 1 in which the interior is vertically divided into a plurality of chambers, each of which has an opening at the front and a horizontal at the front of the uppermost chamber. A door 2 is provided which is rotatable in any direction. As shown in FIG. 6, the door 2 is pivotally supported by the cabinet 1 via a door rotating shaft 3 whose right end extends vertically, and rotates around the door rotating shaft 3 to open and close the opening. .
[0020]
As shown in FIG. 3, the cabinet 1 is formed by covering the outer surface of a resin box with a steel plate 4, and the front end of the steel plate 4 is bent inward at a right angle to cover the periphery of the opening. . A gasket 5 is provided along the entire periphery of the inner surface of the door 2, and a magnet 6 is built in the gasket 5. The magnet 6 attracts the steel plate 4 around the opening by magnetic force. Then, the gasket 5 is brought into close contact with the steel plate 4 to keep the door 2 tightly closed.
[0021]
As shown in FIG. 1, a door opening / closing mechanism 7 is provided on a free end side of the door 2. The door opening / closing mechanism 7 is a handle 9 rotatably attached to the door 2 via a handle base 8. And an elongated substantially rectangular parallelepiped arm 10 disposed below the door 2, and a shaft 11 connecting the handle 9 and the arm 10.
[0022]
The handle base 8 has a box shape with an open front and left sides, and has a top wall 12, a bottom wall 13, a right side wall 14, and a rear wall 15 as shown in FIG. Is fitted in a notch formed at a position distant from the upper and lower ends. A flange 16 is formed around the opening surface of the handle base 8.
[0023]
As shown in FIG. 2, a circular through hole 17 is provided at the right end of the top wall 12 of the handle base 8, and a rotating shaft 36 described later is fitted into the through hole 17, whereby The rotation shaft 36 is fixed. A circular through-hole 18 is provided at the right end of the bottom wall 13 of the handle base 8 so as to face the through-hole 17. 29 fits rotatably.
[0024]
A bearing 19 is formed above the inside of the handle base 8 and protrudes leftward from the inner surface of the right side wall 14. The bearing 19 is opposed to the through hole 17 so as to face the through hole 17. A substantially circular through hole 20 is provided, and a rotary shaft 36 is slidably fitted in the through hole 20.
[0025]
The handle 9 includes an inverted U-shaped handle main body 21 and a shaft support member 22 fitted to a lower portion of the handle main body 21. The handle main body 21 includes an operating portion 23 extending in a vertical direction, an upper support portion 24 protruding sideways from an upper end thereof, and a lower support portion 25 protruding from the lower end of the operating portion 23 in the same direction as the upper support portion 23. And consists of
[0026]
A circular through hole 26 is provided at the tip of the upper support portion 24, and a rotating shaft 36 is rotatably fitted into the through hole 26. On the upper surface of the distal end portion of the lower support portion 25, a columnar convex portion 27 protruding upward is formed so as to face the through hole 26, and the handle body 21 is formed on the convex portion 27. A coil-shaped spring 28 that urges clockwise is attached.
[0027]
The shaft support member 22 is formed so as to slide in a direction opposite to the direction in which the lower support portion 25 protrudes and to be fitted to the lower support portion 25. Thus, a columnar rotating shaft 29 protruding downward is formed.
[0028]
Further, the shaft support member 22 has a circular shaft mounting hole 30 provided at the distal end portion coaxially with the rotating shaft 29 and into which the upper end of the round rod-shaped shaft 11 fits. An upper end portion of the shaft 11 is fixed to 30 so as not to rotate by means such as an adhesive or a key.
[0029]
As shown in FIG. 2, the arm 10 is disposed in an arm storage chamber 31 formed below the door 2. On the lower surface on one end side of the arm 10, a cylindrical rotating shaft 32 protruding downward is formed, and the rotating shaft 32 is formed in a circular bearing hole formed on the bottom surface of the arm housing chamber 31. The arm 10 is rotatably fitted to the arm 33 and rotates in the horizontal direction while the arm 10 is supported horizontally.
[0030]
A circular shaft insertion hole 34 into which the lower end of the shaft 11 is fitted is formed on one end of the arm 10 downward from the upper surface so as to be coaxial with the rotation shaft 32. The lower end of the shaft 11 is fixed to the shaft insertion hole 34 so as not to rotate by means such as bonding or a key.
[0031]
A hollow portion is provided in the door 2 between the notch portion where the handle base 8 is attached and the arm storage chamber 31 so that the shaft 11 can pass therethrough. Has an opening 35 for receiving the lower end of the shaft 11.
[0032]
The door opening / closing mechanism 7 is attached to the door 2 according to the following procedure.
First, the handle base 8 is fitted into the notch of the door 2 and fixed to the door 2 with screws or the like. Further, the arm 10 is inserted into the arm storage chamber 31, and the rotation shaft 32 of the arm 10 is fitted into a bearing hole 33 formed on the bottom surface of the arm storage chamber 31.
[0033]
Next, the upper end of the shaft 11 is inserted and fixed in the hole 30 of the shaft support member 22 separated from the handle main body 21, and the lower end of the shaft 11 is inserted into the through hole 18 of the bottom wall 13 of the handle base 8, The shaft 11 is pushed downward to project the lower end of the shaft into the arm housing chamber 31 to be inserted and fixed in the shaft insertion hole 34 of the arm 10, and the rotating shaft 29 of the shaft support member 22 is inserted into the through hole 18 of the handle base 8. To fit.
[0034]
Next, a spring 28 is fitted into the projection 27 of the lower support 25 of the handle body 21, and one end of the spring 28 is engaged with a predetermined portion on the lower support 25. The lower support member 25 of the handle main body 21 is slid and fitted on the shaft support member 22 fixed to the upper end of the shaft 11, and the other end of the spring 28 is placed at a predetermined position on the handle base 8. Engage.
[0035]
Then, the pin-shaped rotary shaft 36 is passed through the through hole 20 and the through hole 26 of the upper support portion 24 of the handle main body 21 from below the bearing portion 19 of the handle base 8, and further, the tip of the rotary shaft 36 is Into the through hole 17 of the top wall 12. Thus, the handle 9 is rotatably supported by the handle base 8 via the rotation shafts 36 and 29, and the mounting of the door opening / closing mechanism 7 is completed.
[0036]
The handle 9 is usually operated by putting a finger on the back side of the operation unit 23 from the free end side of the operation unit 23, but is also operated by putting a finger on the back side of the operation unit 23 from the rotation shafts 29 and 36. It is formed so that it can be operated with either the left or right hand, so that operability is good.
[0037]
As shown in FIG. 6, a projection 37 that is in contact with the other end of the arm 10 is formed in a portion of the cabinet 1 around the opening around the arm 10. Incidentally, FIG. 4, the distance L ₁ from the point of force to operate the operating portion 23 of the handle 9 to the axis of the convex portion 27 (axis concentric with the rotation axis 29, 36) are shown in FIG. 6 is longer than the distance _{L 2} from the contact point between the projection 37 of the arm 10 to the axis of the shaft 11 (axis concentric with the rotation axis 29, 36).
[0038]
Next, the operation of the door opening / closing mechanism 7 having the above configuration will be described.
When the operating portion 23 of the handle 9 is held by hand and pulled toward the user, a rotating force in the counterclockwise direction in FIG. 6 is applied to the arm 10 via the shaft 11, and the other end of the arm 10 presses the protrusion 37, As a result, a rotational force around the door rotating shaft 3 is applied to the door 2, and the gasket 5 starts to separate from the steel plate 4 around the opening against the magnetic force of the magnet 6.
[0039]
As shown in FIG. 7, when the handle 9 is pulled until one end of the handle 9 comes into contact with the handle base 8 so as to prevent the rotation, the door 2 is closed at the opening of the cabinet 1 as shown in FIG. It is in a state separated by a predetermined distance D from the surroundings. When the handle 9 is further pulled forward from this state, the door 2 rotates counterclockwise around the door rotation shaft 3, and the opening of the cabinet 1 covered by the door 2 is opened, and the object to be stored is opened. Can be put in and out.
[0040]
When the door 2 is first opened at the predetermined interval D, as described above, the axis of the convex portion 27 (the axis of the rotating shafts 29 and 36) is applied from the point of action of the force for operating the operating portion 23 of the handle 9 as described above. The distance L ₁ (see FIG. 4) from the contact point with the projection 37 of the cabinet 1 in the arm 10 to the axis L of the shaft 11 (the axis of the rotating shafts 29 and 36) is L ₂ (see FIG. 6). Because of the leverage, the lever can be opened with a small operating force. Further, since the arm 10 is disposed below the door 2 distant from the handle 9, the arm 10 is less noticeable and can be beautifully designed.
[0041]
Further, when the door 2 is further opened from the state in which the door 2 is opened at the predetermined interval D with respect to the cabinet 1, the door 2 can be opened with a small force because the magnetic contact state of the door 2 with the cabinet 1 is released. . Further, in the present embodiment, since the direction of the force applied to the operating portion 23 of the handle 9 is made to coincide with the opening direction of the door, an operation of opening the door 2 at a predetermined interval first, and then increasing the size of the door 2 The opening operation is smoothly continued, and the door 2 is easily opened.
[0042]
Next, a second embodiment of the present invention will be described.
9 to 11 show a second embodiment of the present invention. FIG. 9 is an enlarged view of a portion A in FIG. 1, FIG. 10 is a sectional view taken along line EE of FIG. 1, and FIG. It is a part enlarged view and is a figure showing an operation of a slide member when a handle is pulled.
Note that, in the present embodiment, portions corresponding to the first embodiment are denoted by the same reference numerals, and description of the same portions is omitted.
[0043]
As shown in FIGS. 9 and 11, in the present embodiment, a thin portion 39 having a reduced thickness is formed on the other end side of the arm 10, and an elongated plate is formed so as to overlap the upper surface of the thin portion 39. A slide member 38 in a shape of is provided. The slide member 38 is slidably guided in the front-rear direction by a pair of guide ribs 40 and 41 extending in the front-rear direction. One end of the slide member 38 faces a part of the cabinet 1 around the opening.
[0044]
A long hole 42 extending in the lateral direction is formed in the slide member 38, and a cylindrical pin 43 erected on the upper surface of the thin portion 39 of the arm 10 is slidably engaged with the long hole 42. I agree. Incidentally, FIG. 4, the distance L ₁ from the point of force to operate the operating portion 23 of the handle 9 to the axis of the convex portion 27 (the axis of the rotary shaft 29, 36) is shown in Figure 11, the arms It is longer than the distance _{L 3} from the connection point between the sliding member 38 to the axis of the shaft 11 (axis of the rotary shaft 29, 36) at 10.
[0045]
In the refrigerator having such a configuration, when the operating portion 23 of the handle 9 is held by a hand and pulled toward the user, a counterclockwise rotational force in FIG. 11 is applied to the arm 10 via the shaft 11 connected to the handle 9. Then, the slide member 38 slides toward the cabinet 1, and one end thereof is pressed against the cabinet 1. When the sliding member 38 pushes the cabinet 1, a rotational force around the door rotation axis 3 is given to the door 2, and the gasket 5 is separated from the steel plate 4 around the opening of the cabinet 1 against the magnetic force of the magnet 6. start.
[0046]
When the handle 9 is pulled by a predetermined stroke, the rotation of the handle is stopped, and the door 2 is opened with a predetermined distance d with respect to the cabinet 1 as shown in FIG. When the handle 9 is further pulled forward from this state, the door 2 rotates counterclockwise about the door rotation shaft 3, and the opening of the refrigerator compartment covered by the door 2 is opened. Can be put in and out.
[0047]
When the door 2 is first opened at the predetermined interval D, as described above, the axis of the convex portion 27 (the axis of the rotating shafts 29 and 36) is applied from the point of action of the force for operating the operating portion 23 of the handle 9 as described above. L ₁ (see FIG. 4) is greater than the distance L ₃ (see FIG. 11) from the connection point of the arm 10 with the slide member 38 to the axis of the shaft 11 (the axes of the rotating shafts 29 and 36). Since the door 2 is long, the door 2 can be opened with a small operating force according to the leverage principle, as in the first embodiment.
[0048]
Further, since the slide member 38 is disposed below the door 2 distant from the handle 9, the design process is less noticeable and can be beautifully performed as in the first embodiment. Further, in the case of the present embodiment, since the portion of the cabinet 1 where the slide member 38 abuts can be flattened, there is an advantage that cleaning is easy and design processing is easy.
[0049]
Note that the above embodiment is an embodiment in which the door is rotatably attached to the cabinet via a door rotation shaft, but in the case where the door is opened and closed by moving the door in a front-rear direction in a drawer type. The handle is provided above the center of the door in the left-right direction. The same effect as described above can be obtained by providing the handle on at least one side, and the finger can be put into the operation unit from above the handle, so that the handle is positioned lower than the elbow of the arm (for example, If the drawer-type door is provided below the vicinity of the center of the cabinet), the handle can be moved downward using the weight of the arm, which further enhances operability. To above.
[0050]
Further, when the door is horizontally disposed on the upper surface of the cabinet and the rear end side is rotatably attached to the cabinet via a door rotation shaft extending in the horizontal direction, a handle is provided on the front end side of the door, When the rotating shaft supporting the shaft is arranged in parallel with the door rotating shaft on the center portion side of the door than the operating portion of the handle, and the arm and the slide member are provided on at least one side of the door in the left and right direction, The same effects as above can be obtained.
[0051]
Note that the door opening and closing mechanism of the present invention can be applied to equipment other than the refrigerator.
[0052]
【The invention's effect】
As described above, according to the door opening / closing mechanism of the present invention, the door can be opened at a predetermined interval with a small operation force by the leverage principle, and the position of the leverage point and the position of the action point can be separated. This makes it possible to set the action point at a place that is less noticeable and to increase the degree of freedom in design, so that beautiful design processing can be performed.
[0053]
In addition, if the position of the lever fulcrum is located closer to the center of the door than the position of the power point, and the direction of the force applied to the power point matches the opening direction of the door, the door can be easily opened and the operability is improved. improves.
[0054]
Further, when the position of the lever is set below or to the side of the door, the point of application is particularly inconspicuous, and the design can be beautifully processed, so that the appearance is improved.
[0055]
A handle rotatably attached to the door via a rotation shaft, the handle being formed so as to be operated by putting a finger from the free end side to the back side of the operation unit; If it is formed so that it can be operated by putting a finger on the back side of the operation unit also from the rotating shaft side, the handle can be operated from both the free end side and the rotating shaft side, Operability is improved.
[Brief description of the drawings]
FIG. 1 is a front view of a refrigerator provided with a door opening / closing mechanism of the present invention.
FIG. 2 is a diagram showing the first embodiment of the present invention, and is an enlarged view of a portion A in FIG. 1;
FIG. 3 is a diagram showing the first embodiment of the present invention, and is a cross-sectional view taken along line BB of FIG. 1;
FIG. 4 is a view showing the first embodiment of the present invention, and is a cross-sectional view taken along line CC of FIG. 1;
FIG. 5 is a view showing the first embodiment of the present invention, and is a cross-sectional view taken along line DD of FIG. 1;
FIG. 6 is a diagram showing the first embodiment of the present invention, and is a cross-sectional view taken along line EE of FIG. 1;
FIG. 7 is a view showing the first embodiment of the present invention, and is a view showing a state where a handle in FIG. 5 is pulled.
8 is a diagram showing the first embodiment of the present invention, and is an enlarged view of a main part of FIG. 6 (a diagram showing the operation of the arm when the handle is pulled).
FIG. 9 is a diagram showing a second embodiment of the present invention, and is an enlarged view of a portion A in FIG. 1;
FIG. 10 is a view showing a second embodiment of the present invention, and is a cross-sectional view taken along line EE of FIG. 1;
11 is a diagram showing the second embodiment of the present invention, and is an enlarged view of a main part of FIG. 10 (a diagram showing the operation of the slide member when the handle is pulled).
FIG. 12 is a plan sectional view of a main part of a conventional refrigerator.
FIG. 13 is a side sectional view of a main part of a conventional refrigerator.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Cabinet 2 Door 7 Door opening / closing mechanism 9 Handle 10 Arm 11 Shaft 23 Handle operation part 38 Slide member

Claims (7)

Contact or away around the opening a door opening and closing mechanism provided on a door for opening and closing the opening, the rotary shaft and the axial direction of the door and having an operating portion for gripping when opening the door the same A handle that is rotatably provided by a support shaft disposed closer to the center of the door than the operation unit, and an operation point of the lever that uses the operation unit as a power point and the support shaft as a support point. wherein the axial direction in plan view extends on the opposite side of the operating portion with respect to the support shaft formed on the handle and integral, when opening the door, the acting by pulling by gripping the operating portion A door opening / closing mechanism, wherein a point pivots to press around the opening, and the door pivots in the same direction as the handle and is separated from the periphery of the opening by a predetermined distance. A door opening / closing mechanism provided on a door that opens and closes the opening by sliding back and forth around the opening by sliding back and forth, wherein the door opening and closing mechanism is gripped when the door is opened and is substantially at the center in the left-right direction of the door. a handle pivotably mounted by axially transverse direction of the support shaft disposed below the said operating unit and an operation unit that is disposed fulcrums said shaft the operating unit as a force point The operating point of the lever is formed integrally with the handle so as to extend in a direction opposite to the operating portion with respect to the support shaft when viewed from the axial direction of the support shaft, and when the door is opened, By gripping and pulling the operation unit , the point of action rotates and presses around the opening, and the door slides forward and is separated from the periphery of the opening by a predetermined distance. Door opening and closing mechanism. 3. The lever according to claim 1, wherein the lever is provided below or on a side of the door, and a locus of the lever is different from a locus of the point of application. A door opening / closing mechanism according to any one of the above. The door opening / closing mechanism according to any one of claims 1 to 3, wherein the handle can be gripped by inserting fingers into the back surface from the free end side and the support shaft side. 2. An arm which pivots around an axis coaxial with said support shaft in synchronization with said handle, said arm serving as said leverage point and pressing around said opening. The door opening / closing mechanism according to claim 4. An arm that rotates around an axis that is coaxial with the support shaft in synchronization with the handle, and is slidably provided so as to engage with the arm and contact and separate around the opening by rotation of the arm; The door opening / closing mechanism according to any one of claims 1 to 5, further comprising: a sliding member that is adapted to act as the point of action of the lever to press around the opening. The operating force for opening the door after the predetermined interval is smaller than the operating force when the lever is applied around the opening and the door is separated from the periphery of the opening by a predetermined distance. The door opening / closing mechanism according to any one of claims 1 to 6, wherein is smaller.

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