JP3761560B1 - Door opening / closing mechanism - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a door opening / closing mechanism which is small in size and can reduce an operation force.
SOLUTION: In a door opening / closing mechanism that opens and closes an opening by bringing a door 2a attached to a main body 6 having an opening into and out of contact with the periphery of the opening, the shaft 2 is pivotally supported by the door 2a and an operation unit 5a And a handle 5 that rotates by gripping the handle 5 and is rotatably connected to the handle 5 on the same side as the operation portion 5a with respect to the shaft 51, and a second shaft portion 32b that is rotatably attached to the door 2a. A lever member having a first shaft portion 32a and a cam lever 31 disposed on the opposite side of the first shaft portion 32a with respect to the second shaft portion 32b and disposed opposite to the outer slide cam 12 provided in the main body portion 6. 30, when the operation portion 5a is pulled, the cam lever 31 presses the slide outer cam 12, and the door 2a is separated from the periphery of the opening by a predetermined distance.
[Selection] Figure 6

Description

  The present invention relates to a door opening / closing mechanism for opening and closing a door of a refrigerator or the like.

A conventional door opening / closing mechanism in which a door attached to a main body having an opening contacts and separates around the opening to open and close the opening is disclosed in Patent Document 1. The door opening / closing mechanism is provided with a door on the main body so as to be rotatable, and a handle is pivotally supported on the door. The handle has an operation portion that is gripped and operated by the user, and an end portion on the opposite side of the operation portion with respect to the rotation axis of the handle is disposed to face the periphery of the opening. When the operation portion is pulled and the handle is rotated, the end portion presses the main body portion by the lever principle. Accordingly, the door is separated from the periphery of the opening by a predetermined operating force with a small operating force, and the door is rotated and opened by further pulling the operating portion.
Japanese Unexamined Patent Publication No. 2000-18803 (pages 2 to 3 and FIG. 3)

  However, according to the conventional door opening / closing mechanism, it is necessary to lengthen the operation portion in order to reduce the operation force of the handle. In addition, an end portion that presses the main body is disposed on the side opposite to the operation portion. For this reason, there is a problem that the handle becomes large, the turning radius is large, and the operability is lowered. In addition, when the space for installing the handle is limited, there is a problem that the operation portion and the rotating shaft approach each other and the operation force cannot be sufficiently reduced.

  It is an object of the present invention to provide a door opening / closing mechanism that is small in size and can reduce the operation force.

In order to achieve the above object, the present invention provides a door opening / closing mechanism that opens and closes the opening by opening and closing the door attached to the main body having an opening around the opening.
A handle that is pivotally supported by the door and that rotates by gripping the operating portion;
A support part rotatably attached to the door; a connection part rotatably connected to the handle on the same side as the operation part with respect to a rotation axis of the handle; and the support part A lever member having an abutting portion disposed on the opposite side of the connecting portion and disposed opposite to the periphery of the opening;
When the operation part is pulled, the contact part presses the main body part, and the door is separated from the periphery of the opening part by a predetermined distance.

  According to this configuration, when the operation unit is grasped and pulled, the lever member coupled to the handle via the coupling unit rotates about the support unit. The contact portion is rotated by the rotation of the lever member, and the periphery of the opening is pressed. The operating force of the handle is amplified by the lever principle and transmitted to the connecting portion, and further amplified by the lever member and transmitted to the contact portion. Further, the operation portion and the connecting portion are arranged on the same side with respect to the rotation shaft of the handle, and the handle and the lever member are arranged so as to overlap in a plan view or a front view. Since the handle and the lever member have different rotation centers, at least one of the support portion and the connection portion is loosely fitted to the door or the handle.

  According to the present invention, in the door opening / closing mechanism configured as described above, the lever member includes a crankshaft that forms the coupling portion and the support portion by first and second shaft portions arranged in parallel, and the contact portion Is suspended from the second shaft portion, and the operation portion and the contact portion are arranged in different planes perpendicular to the rotation axis of the handle. According to this configuration, the lever member is connected to the handle at the first shaft portion and supported by the door at the second shaft portion. In the lever member, the operating force of the handle is transmitted to the first shaft portion, and the contact portion rotates with the second shaft portion serving as a rotation shaft.

  According to the present invention, in the door opening / closing mechanism configured as described above, the first shaft portion is loosely fitted in a long hole provided in the handle. According to this configuration, as the handle rotates, the first shaft portion relatively moves and engages within the long hole, and the crankshaft rotates.

  According to the present invention, in the door opening / closing mechanism configured as described above, the pivot shaft of the handle and the contact portion are disposed on the opposite side with respect to the connecting portion. According to this configuration, the lever member can be disposed within the width of the handle, and the distance between the rotation shaft of the handle and the connecting portion can be shortened.

  According to the present invention, in the door opening / closing mechanism configured as described above, the door is rotatably held by the main body, and the opening is opened and closed by the rotation of the door. According to this configuration, when the handle is pulled, the door is rotated and opened.

According to the present invention, in the door opening / closing mechanism configured as described above, the handle and the lever member are provided symmetrically on both sides of the door, and two cam mechanisms for engaging and releasing the door and the main body are provided. Provide symmetrically on both sides of the door,
When the door is closed, the cam mechanisms on both sides take a symmetric first locking position, and when one of the doors is opened, the door slides toward the outside of the one and the other cam mechanism The door is pivotally locked by moving to the second locking position,
The operation unit is arranged closer to the center of the door than the pivot shaft of the handle.

  According to this configuration, for example, the handle is provided at the left and right ends of the door, and when the left handle is pulled, the door pivots forward from the left and slides to the left, and the left cam mechanism is disengaged. The right cam mechanism moves from the first locking position to the second locking position. The right cam mechanism holds the pivot shaft at the second locking position and the door rotates.

  According to the present invention, in the door opening / closing mechanism configured as described above, the door is slidably held back and forth with respect to the main body, and the door slides back and forth to open and close the opening. According to this configuration, when the handle is pulled, the door slides forward to be opened.

Further, the present invention is a door opening and closing mechanism for opening and closing the opening by contacting and separating a door attached to a main body having an opening around the opening.
A handle that is pivotally supported on the door by a support shaft and rotated by gripping the operation unit;
It has a rotation center on the same side as the operation portion with respect to the support shaft and is connected to the handle between the rotation center and the support shaft, and an operation force when the handle is rotated is A connecting part that is amplified and transmitted;
It is arranged on the opposite side of the connecting portion with respect to the rotation center of the connecting portion, and rotates together with the connecting portion to transmit the rotational force of the connecting portion, and is arranged opposite to the periphery of the opening. A contact portion;
It includes a booster mechanism having the contact portion upon rotating the handle is characterized in that for a predetermined distance apart the door by pressing the body portion from the periphery of the opening. According to this configuration, when the handle is gripped and pulled, the operating force is amplified by the booster mechanism and transmitted to the contact portion, and the contact portion presses the periphery of the opening to open the door.

  According to the present invention, the support part rotatably attached to the door, the connection part rotatably connected to the handle on the same side as the operation part with respect to the rotation axis of the handle, and the connection to the support part Since the lever member having the abutting portion arranged on the opposite side of the opening portion and opposed to the periphery of the opening portion is provided, the door opening / closing mechanism can be made small by arranging the handle and the lever member so as to overlap each other. The door can be opened with a light operating force by amplifying the operating force that pulls the operating portion with the lever member.

  Further, according to the present invention, since the lever member has the crankshaft having the first and second shafts, it is possible to easily realize a small door opening / closing mechanism that is light in operating force. In addition, the handle can be disposed at a desired position away from the abutting portion that is disposed opposite to the periphery of the opening.

  Further, according to the present invention, since the first shaft portion is loosely fitted in the long hole provided in the handle, the support portion can be rotatably fixed to the door and the pressing position by the contact portion can be made constant.

  Further, according to the present invention, since the rotation shaft of the handle and the contact portion are arranged on the opposite side with respect to the connecting portion, the door opening / closing mechanism can be further miniaturized and the door can be opened with a lighter operating force.

  Further, according to the present invention, the door has a cam mechanism on both sides of the door, and when opening one of the doors, the door slides toward the outside of the one, and the operation portion is moved more than the rotation shaft of the handle. Since it arrange | positions in the center side, when pulling an operation part, a door can be slid easily and the operativity of a door opening / closing mechanism can be improved.

  Further, according to the present invention, since the booster mechanism for transmitting the operation force of the handle to the contact portion is provided, the door opening / closing mechanism can be reduced in size and the door can be opened with a light operation force.

  Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a front view showing a refrigerator provided with a door opening / closing mechanism according to an embodiment. The refrigerator 1 is provided with a refrigerator compartment 2 in the upper stage, and a vegetable compartment 3 and a freezer compartment 4 are arranged side by side on the lower stage. The refrigerator compartment 2 is covered with the front and rear doors 2a so that the front surface of the main body 6 (see FIG. 4) can be opened and closed from either the left or right side by operating the handle 5 provided symmetrically to the left and right as will be described in detail later. ing.

  2 and 3 are a front view and a top view showing the left half of the hinge angle 10 disposed at the lower part of the refrigerator compartment 2 on the main body 6 (see FIG. 4) side. The hinge angle 10 is formed symmetrically with a metal such as a galvanized steel plate and is screwed to the main body 6. The hinge angle 10 is provided with a hinge pin 11 made of stainless steel or the like and a lock outer cam 12 symmetrically by caulking.

  A hinge cover 10a is provided on the upper surface of the hinge angle 10 by insert molding. The hinge pin 11 serves as a pivot shaft of the door 2a, and an arcuate rib 13 concentric with the hinge pin 11 is formed integrally with the hinge cover 10a. The lock outer cam 12 is arranged at a predetermined distance from the hinge pin 11, and slides with the slide outer cam 22 (see FIG. 4) to guide the door 2a.

  FIG. 4 is a plan view showing an engagement relationship between the slide cam member 20 and the hinge angle 10 provided on the left side of the lower end of the door 2a. The slide cam member 20 is provided symmetrically on the left and right ends of the door 2a. First and second groove cams 24 and 25 that are substantially L-shaped and relatively slide-guide the hinge pin 11 are recessed in the end portion of the slide cam member 20.

  A boss 23 that slides on the rib 13 protrudes around the second groove cam. A groove portion 21 is recessed on the right side of the first and second groove cams 24 and 25. An outer slide cam 22 is provided in the groove portion 21 so as to face the outer lock cam 12. Thus, the slide cam member 20 and the hinge angle 10 are engaged with each other to constitute a cam mechanism for guiding the door 2a. In addition, in the same figure, although each said structure of the slide cam member 20 is provided in a lower surface, it has shown as the continuous line for convenience.

  The slide cam member 20 is also provided symmetrically on the upper surface of the door 2a, and a hinge pin 11, a lock outer cam 12, and a rib 13 that engage with the slide cam member 20 are provided above the main body portion 6.

  A cam lever 31 is disposed in the groove portion 21 of the slide cam member 20 disposed on the lower surface of the door 2a. The cam lever 31 is disposed so as to face the outer lock cam 12 and rotates around the second shaft portion 32b of the crankshaft 32 (see FIG. 5) supported by the door 2a.

  5, 6 and 7 are a front sectional view, a top sectional view and a side sectional view showing the lower left part of the door 2a. FIG. 8 is a cross-sectional view taken along the line AA in FIG. The handle 5 is pivotally supported by a shaft 51 fitted to a shaft receiver 7 provided on the door 2a. As a result, the shaft 5 is turned by the shaft 51 as a turning shaft, and the handle 5 is turned by grasping the operation portion 5a and pulling it forward. A torsion spring 55 is inserted through the shaft 51. The torsion spring 55 returns the rotating handle 5 to the original position.

  The handle 5 includes a handle main body 52, a handle reinforcement angle 53, and a handle decoration plate 54. FIGS. 9A to 9C are a plan view, a front view, and a side view showing the handle main body 52. The handle main body 52 is made of a resin molded product, and an insertion hole 52a through which the shaft 51 is inserted is provided at one end. The center side of the door 2a becomes an open end rather than the insertion hole 52a, and the operation part 5a which a user holds is formed.

  10A and 10B are a plan view and a front view showing the handle reinforcement angle 53. FIG. The handle reinforcement angle 53 is made of a metal plate and is attached to the front surface of the handle main body 52. One end of the handle reinforcing angle 53 is formed with an insertion hole 53a through which the shaft 51 is inserted. A long hole 53b through which the first shaft portion 32a (see FIG. 12) of the crankshaft 32 is inserted is provided on the same side as the operation portion 5a with respect to the insertion hole 53a.

  FIGS. 11A to 11C are a plan view, a front view, and a side view showing the handle decoration plate 54. The handle decoration plate 54 is made of a resin molded product, and an engagement claw 54a protruding from the back surface side engages with an engagement hole 52b (see FIG. 9) and is attached to the handle main body 52.

  FIG. 12 is a front view showing the crankshaft 32. The crankshaft 32 has parallel first and second shaft portions 32a and 32b, and a bent portion 32c is formed by bending the lower end of the second shaft portion 32b. The cam lever 31 is attached to the bent portion 32c. The first shaft portion 32 a is loosely fitted through the elongated hole 53 b of the handle reinforcing angle 53 and constitutes a connecting portion that connects the handle 5 and the crankshaft 32. By connecting the handle 5 and the cam lever 31 with the crankshaft 32, the handle 5 is arranged at a desired position away from the cam lever 31 that is disposed opposite to the periphery of the opening of the main body 6 to improve convenience. can do.

  A shaft cover 56 is provided on the door 2 a below the handle 5. FIGS. 13A to 13C are a plan view, a front view, and a side view showing the shaft cover 56. The shaft cover 56 is formed of a resin molded product, and rotatably supports the second shaft portion 32b (support portion) of the crankshaft 32 by a fitting portion 56a having a U-shaped cross section. Further, the first shaft portion 32b has a substantially fan-shaped space portion 56b that can rotate. Thus, the crankshaft 32 and the cam lever 31 constitute a lever member 30 that rotates around the second shaft portion 32b as the handle 5 rotates.

  When the operation portion 5a of the handle 5 is pulled, the operation force is transmitted to the first shaft portion 32a through the long hole 53a, and the first shaft portion 32a rotates forward in the space portion 56b. As the first shaft portion 32a rotates, the crankshaft 32 rotates around the second shaft portion 32b, and the cam lever 31 rotates rearward to press the unlocked cam 12. Thereby, as shown in FIG. 14, the door 2a is separated from the periphery of the opening by a predetermined distance.

  At this time, the distance between the first shaft portion 32a (connecting portion) and the shaft 51 is smaller than the distance between the operation portion 5a and the shaft 51, and the operation force of the operation portion 5a is amplified. Further, the distance between the second shaft portion 32b and the portion of the cam lever 31 that contacts the outer lock cam 12 is smaller than the distance between the first shaft portion 32a and the second shaft portion 32b. Thereby, the operating force is further amplified. Therefore, the handle 5 and the lever member 30 constitute a booster mechanism, and the outer lock cam 12 can be pressed with a light operating force.

  Moreover, since the operation part 5a and the 1st axial part 32a are arrange | positioned with respect to the shaft 51, the handle | steering-wheel 5 and the lever member 30 are arrange | positioned in plan view. Thereby, the lever member 30 is provided within the width of the handle 5 in the left-right direction. Therefore, even when the size of the handle 5 is limited, it is possible to obtain a small door opening / closing mechanism with a large amplification factor of the operation force by increasing the distance between the operation portion 5a and the shaft 51. If there is a space at the lower end of the door 2a, the lever member 30 may be disposed so as to protrude from the width of the handle 5.

  Further, since the shaft 51 and the cam lever 31 are disposed on the opposite sides with respect to the first shaft portion 32a, the shaft 51 and the first shaft portion 32a are provided while providing the lever member 30 within the width in the left-right direction of the handle 5. Can be shortened. Therefore, the operation force can be amplified more greatly.

  It should be noted that the distance between the second shaft portion 32b and the portion of the cam lever 31 that is in contact with the outer lock cam 12 may be substantially equal to or slightly longer than the distance between the first shaft portion 32a and the second shaft portion 32b. . If it does in this way, the amplification effect of the operation force by lever member 30 will not be acquired. However, it is possible to obtain a small door opening / closing mechanism having a large amplification factor of the operation force by increasing the distance between the operation unit 5a and the shaft 51.

  Further, since the rotation center of the handle 5 and the lever member 30 are different, the first shaft portion 32a that connects them is loosely fitted in the long hole 53a. The first shaft portion 32a may be rotatably fixed to the handle 5, and the second shaft portion 32b may be loosely fitted to the door 2a. When the second shaft portion 32b is fixed and the first shaft portion 32a is loosely fitted, the pressing position of the cam lever 31 can be kept constant and stably pressed.

  15-18 is a top view which shows operation | movement of the cam mechanism at the time of opening the door 2a. In FIG. 15, when the door 2 a is closed, the left and right cam mechanisms take the first locking position where the hinge pin 11 is disposed at the end of the first groove cam 24. Since the first groove cam 24 is inclined toward the center of the door 2a as it goes rearward, the first groove cam 24 is prevented from falling off by pulling both sides of the door 2a.

  When the operation portion 5a of the handle 5 on the left side of the door 2a is pulled, the left lock outer cam 12 is pressed by the cam lever 31 and the door 2a is separated from the main body portion 6 as shown in FIG. FIG. 16 shows the state at this time. In the left cam mechanism, the hinge pin 11 is relatively guided by the first cam groove 24, and the outer lock cam 12 and the outer slide cam 22 slide. In the right cam mechanism, the hinge pin 11 is relatively guided by the second cam groove 25. Thereby, the door 2a slides leftward while rotating.

  When the handle 5 is further pulled, the cam lever 31 is separated from the left lock outer cam 12. FIG. 17 shows the state at this time. In the left cam mechanism, similarly to the above, the hinge pin 11 is relatively guided by the first cam groove 24, and the outer lock cam 12 and the outer slide cam 22 slide. In the right cam mechanism, the hinge pin 11 is disposed at the end of the second cam groove 25, and the boss 23 starts sliding with the rib 13. As a result, the hinge pin 11 is in a locked state in which relative sliding movement is restricted, and is supported rotatably.

  When the handle 5 is further pulled, the left cam mechanism is disengaged as shown in FIG. In the right cam mechanism, the boss 23 slides on the rib 13 at the second locking position, and the slide outer cam 22 slides and guides the lock outer cam 12. Then, the right cam mechanism maintains the second locking position, and the door 2a is opened.

  The left and right double door 2a is slid to the outside on the opening side when opened. Since the operation portion 5a is disposed on the center side of the door 2a with respect to the shaft 51 serving as the rotation axis of the handle 5, the operation force of the operation portion 5a works toward the outside on the opening side. Accordingly, the door opening / closing mechanism with better operability can be obtained by easily sliding the door 2a.

  In the present embodiment, the bottom wall of the refrigerator compartment 2 is pressed by the lever member 30, but the sidewall of the refrigerator compartment 2 may be pressed. In addition, a door opening / closing mechanism having a handle 5 and a lever member 30 is provided on a pivoting door 2a that opens both right and left, but the door 2a is rotated 90 degrees in the plane and the handle 5 is arranged vertically. It may be a door opening / closing mechanism (for example, a dashboard of a car or an opening / closing door of a dishwasher). Further, it may be a door opening / closing mechanism such as a freezer provided with an opening for taking in and out stored items on the upper surface. In addition, the door opening / closing mechanism used in these may be a single-opening door opening / closing mechanism in which the door rotates by pulling one of the upper, lower, left, and right front and rear.

  Furthermore, a door opening / closing mechanism similar to that of the present embodiment may be provided on a door that slides back and forth (for example, a sliding door for a refrigerator). In this case, for example, a shaft 51 serving as a rotation axis of the handle 5 is provided horizontally at the center in the left-right direction of the door 2 a, and the operation portion 5 a of the handle 5 having a predetermined width in the left-right direction is disposed below the shaft 51. To do. Further, a recess is provided on the surface of the door 2a facing the operation portion 5a.

  The crankshaft 32 is formed such that the second shaft portion 32b extends to the side surface of the door 2a in the left-right direction, and the cam lever 31 is disposed opposite to the main body portion 6 on the side portion of the door 2a. Thus, when a finger is inserted into the recess on the back surface of the operation portion 5a and the handle 5 is pulled, the cam lever 31 presses the main body portion 6 on the side of the door 2a to separate the door 2a from the main body portion 6 by a predetermined distance. it can. Note that the operation portion 5 a of the handle 5 may be disposed above the shaft 51.

  INDUSTRIAL APPLICATION This invention can be utilized for the door opening / closing mechanism which opens and closes doors, such as a refrigerator, a dashboard of a car, and a dishwasher.

The front view which shows the refrigerator of embodiment of this invention The front view which shows the hinge angle of the refrigerator of embodiment of this invention The top view which shows the hinge angle of the refrigerator of embodiment of this invention The top view which shows the slide cam member of the refrigerator of embodiment of this invention Front sectional drawing which shows the handle | steering-wheel part of the door of the refrigerator of embodiment of this invention Plan sectional drawing which shows the handle | steering-wheel part of the door of the refrigerator of embodiment of this invention Side surface sectional drawing which shows the handle | steering-wheel part of the door of the refrigerator of embodiment of this invention AA sectional view of FIG. The figure which shows the handle | steering-wheel main-body part of the refrigerator of embodiment of this invention. The figure which shows the handle | steering-wheel reinforcement angle of the refrigerator of embodiment of this invention The figure which shows the handle decoration board of the refrigerator of embodiment of this invention The front view which shows the crankshaft of the refrigerator of embodiment of this invention The figure which shows the shaft cover of the refrigerator of embodiment of this invention Plan sectional drawing which shows the handle | steering-wheel part at the time of door opening of the refrigerator of embodiment of this invention The top view which shows operation | movement of the cam mechanism at the time of door opening of the refrigerator of embodiment of this invention The top view which shows operation | movement of the cam mechanism at the time of door opening of the refrigerator of embodiment of this invention The top view which shows operation | movement of the cam mechanism at the time of door opening of the refrigerator of embodiment of this invention The top view which shows operation | movement of the cam mechanism at the time of door opening of the refrigerator of embodiment of this invention

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Refrigerator 2 Refrigerating room 2a Door 3 Vegetable room 4 Freezing room 5 Handle 5a Operation part 6 Main part 10 Hinge angle 11 Hinge pin 12 Lock outside cam 13 Rib 20 Slide cam member 22 Slide outside cam 23 Boss 24 1st groove cam 25 2nd Groove cam 30 Lever member 31 Cam lever (contact part)
32 Crankshaft 32a First shaft part (connecting part)
32b Second shaft portion (support portion)
51 Shaft 52 Handle body 53 Handle reinforcement angle 53a Long hole 54 Handle decorative plate 56 Shaft cover

Claims (8)

In a door opening and closing mechanism that opens and closes the opening by bringing a door attached to a main body having an opening into and out of contact with the periphery of the opening,
A handle that is pivotally supported by the door and that rotates by gripping the operating portion;
A support part rotatably attached to the door; a connection part rotatably connected to the handle on the same side as the operation part with respect to a rotation axis of the handle; and the support part A lever member having an abutting portion disposed on the opposite side of the connecting portion and disposed opposite to the periphery of the opening;
The door opening / closing mechanism is characterized in that when the operation part is pulled, the contact part presses the main body part and the door is separated from the periphery of the opening part by a predetermined distance.   The lever member has a crankshaft that forms the connecting portion and the support portion by first and second shaft portions arranged in parallel, and the contact portion is suspended from the second shaft portion, and the handle The door opening / closing mechanism according to claim 1, wherein the operation portion and the contact portion are arranged in different planes perpendicular to the rotation axis.   The door opening / closing mechanism according to claim 2, wherein the first shaft portion is loosely fitted in a long hole provided in the handle.   The door opening / closing mechanism according to any one of claims 1 to 3, wherein a rotation shaft of the handle and the contact portion are disposed on the opposite side with respect to the connecting portion.   The door opening / closing mechanism according to any one of claims 1 to 4, wherein the door is rotatably held by the main body and the opening is opened and closed by the rotation of the door. The handle and the lever member are provided symmetrically on both sides of the door, and two cam mechanisms for engaging and disengaging the door and the main body are provided symmetrically on both sides of the door,
When the door is closed, the cam mechanisms on both sides take a symmetric first locking position, and when one of the doors is opened, the door slides toward the outside of the one and the other cam mechanism The door is pivotally locked by moving to the second locking position,
The door opening / closing mechanism according to claim 5, wherein the operation unit is arranged closer to a center side of the door than a rotation shaft of the handle.   The door according to any one of claims 1 to 4, wherein the door is slidably held back and forth with respect to the main body, and the door slides back and forth to open and close the opening. Opening and closing mechanism. In a door opening and closing mechanism that opens and closes the opening by bringing a door attached to a main body having an opening into and out of contact with the periphery of the opening,
A handle that is pivotally supported on the door by a support shaft and is rotated by gripping the operation unit;
It has a rotation center on the same side as the operation portion with respect to the support shaft and is connected to the handle between the rotation center and the support shaft, and an operation force when the handle is rotated is A connecting part that is amplified and transmitted;
It is arranged on the opposite side of the connecting portion with respect to the rotation center of the connecting portion, and rotates together with the connecting portion to transmit the rotational force of the connecting portion, and is disposed opposite to the periphery of the opening. A contact portion;
Includes a booster mechanism having a door opening and closing mechanism in which the abutment upon rotating the handle, characterized in that for a predetermined distance apart the door by pressing the body portion from the periphery of the opening.

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