JP2008163715A - Door opening / closing mechanism - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To improve usability in such a way that a first rolling element is provided on a door and one side of a main body of an apparatus while a guide member is provided on the other side and the first rolling element contacts with the guide member and rolls it, so that the door closes by itself by its own weight. <P>SOLUTION: In the door opening and closing mechanism wherein doors 2, 3 for covering both sides with the middle of an opening part 1a of the apparatus main body 1 as a boundary are opened and closed having both ends of an opening 1a as shaft sides, when the doors 2, 3 are closed, they take first locking positions, and also when the doors 2, 3 are opened, they are slid from an opening side to the shaft side to take second locking positions. A cam mechanism pivoting the door 2 at the second locking position is provided. Furthermore, a first rolling element 63 capable of rolling is provided on the doors 2, 3 and one side of the apparatus main body 1 while a guide member 60 on the other side contacted by the first rolling element 63 for guiding the doors 2, 3 to be closed by their own weights is provided. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a door opening / closing mechanism that opens and closes doors on both sides at the middle of an opening of a refrigerator storage room or the like.

  A conventional door opening / closing mechanism of this type is disclosed in Patent Document 1. In the door opening / closing mechanism, the device main body having an opening and the door are connected by a lever member biased by a spring, and the opening is closed by the door. When the door is opened, the door rotates with respect to the lever member while the lever member rotates against the biasing force of the spring. The door slides and moves away from the other door by the rotation of the lever member. Thereby, the damage by sliding of the packing provided between both doors can be prevented.

  According to the door opening / closing mechanism described above, a frictional force corresponding to the weight of the door is applied to the sliding surface between the lever member and the device main body, so that the biasing force of the spring needs to be larger than the frictional force. As a result, when the door is opened, a large operating force against the frictional force of the lever member and the biasing force of the spring is required, resulting in poor operability.

  In order to solve this problem, Patent Document 2 discloses a door opening / closing mechanism that slides a door without using a spring. The door opening / closing mechanism is provided with a cam mechanism that engages with the device main body and the door. The cam mechanism takes the first locking position when the door is closed. When the door is opened, the cam mechanism shifts from the first locking position to the second locking position, slides the door from the open side to the shaft side, and the door is pivotally supported at the second locking position. Thereby, the operation force at the time of opening and closing of a door can be made small, and operativity can be improved.

Japanese Examined Patent Publication No. 60-24390 (pages 1 to 3 and FIG. 9) Japanese Patent Laid-Open No. 2003-3731 (pages 4-8, FIG. 5)

  However, according to the door opening / closing mechanism disclosed in Patent Document 2, since the opening force of the door is reduced, if one door is closed with force, the pressure in the room that opens the opening increases. As a result, the other door opens against the user's intention, and there is a problem of poor usability.

  An object of this invention is to provide the door opening / closing mechanism which can improve usability.

  In order to achieve the above object, the present invention provides a door opening / closing mechanism that opens and closes a door that covers both sides with the middle of the opening of the device body as a boundary, with both ends of the opening being the shaft sides. A cam mechanism is provided that takes the first locking position, slides the door from the open side to the shaft side when the door is opened, takes the second locking position, and pivotally supports the door at the second locking position. , A rollable first rolling element provided on one of the door and the device main body, and a guide provided on the other and guided in a direction to close the door by its own weight when the first rolling element contacts and rolls. It is characterized by providing a part.

  According to this configuration, the cam mechanism takes the first locking position when the door is closed. When the door is opened, the cam mechanism shifts from the first locking position to the second locking position, and accordingly, the door is guided by the cam mechanism to perform sliding movement and rotation movement from the opening side to the shaft side. When the cam mechanism reaches the second locking position, the position of the pivot shaft of the door is fixed, the door pivots about the pivot shaft, and the opening is opened. When the door is closed, the cam mechanism shifts from the second locking position to the first locking position. At this time, the first rolling element rolls in contact with the guide portion, and the door is guided in the closing direction by its own weight.

  Further, the present invention is the door opening and closing mechanism configured as described above, wherein the cam mechanism includes a hinge pin that serves as a rotation shaft of the door when the door is opened, and a guide pin that is disposed on either the door or the device body. By guiding the hinge pin and locking it at both ends, the cam mechanism guides the guide pin from the first locking position to the second locking position, and the hinge groove taking the first and second locking positions. A guide groove, a rib arranged along a circular arc coaxial with the hinge pin, and a boss having a cylindrical surface in sliding contact with the rib at the second locking position are provided.

  According to this configuration, for example, a hinge pin protrudes from one end of the device main body, and a guide pin protrudes in parallel to the hinge pin at a position facing the end of the door on the open side. A long-hole hinge groove that is loosely fitted to the hinge pin and a guide groove that is loosely fitted to the guide pin are recessed in the door. When the door is closed, the hinge pin is locked at one end of the hinge groove, the guide pin is locked at one end of the guide groove, and the cam mechanism takes the first locking position. When the door starts to open, the hinge pin is guided into the hinge groove. At this time, the guide pin and the guide groove are engaged to prevent the door from rotating, and the guide pin is guided by the guide groove and the door slides while rotating. Thereby, the hinge pin is locked to the other end of the hinge groove, and the cam mechanism takes the second locking position. Further, a rib having, for example, a cylindrical concave surface concentric with the hinge pin is projected on the main body side, and a boss having a cylindrical surface slidably contacting the rib at the second locking position is provided on the door side. When the door is further opened, the peripheral surface of the boss is slidably brought into contact with the concave surface of the rib, the hinge pin is fixed to the other end of the hinge groove, and the door rotates around the hinge pin as a rotation axis at the second locking position. At this time, for example, an escape portion is provided in the guide groove so that the guide pin escapes in a direction that does not hinder the rotation of the door. In addition, in each combination of a hinge pin and a hinge groove, a guide pin and a guide groove, and a rib and a boss, as long as it is provided on one side and the other side on the apparatus main body side and the door side, they may be provided.

  According to the present invention, in the door opening / closing mechanism having the above-described configuration, the guide portion includes a first inclined surface that is lowered when the door is closed when the first rolling element contacts and rolls, and the door is in a closed state. The rotation axis of the first rolling element and the contour line of the first inclined surface are inclined with respect to the longitudinal direction.

  According to this configuration, for example, the first rolling element is provided on the door, and the first inclined surface is provided on the bottom of the opening so that the rear is lowered. The first rolling element rolls on the first inclined surface, and the door is guided rearward by its own weight. The first rolling element whose axis is inclined with respect to the longitudinal direction of the door moves in an oblique direction with respect to the longitudinal direction of the door to rotate with sliding movement when the door starts to open from the closed state. The first rolling element may be provided on the bottom of the opening, and the first inclined surface may be provided on the bottom surface of the door so that the rear is lowered.

  According to the present invention, in the door opening / closing mechanism configured as described above, when the door is opened, the cam mechanism moves from the first locking position to the second locking position, and the door slides while rotating, The rotating shaft of one rolling element is arranged substantially perpendicular to the moving direction of the first rolling element. According to this configuration, the direction of rolling friction of the first rolling element substantially coincides with the moving direction of the first rolling element.

  According to the present invention, in the door opening / closing mechanism having the above-described configuration, the second rolling element disposed on one of the door and the device main body and capable of rolling, and the second rolling element disposed on the other rolls in contact with the rolling element. A second inclined surface that rises when the door is closed, and the first rolling element is the first inclined surface when the cam mechanism moves between the first locking position and the second locking position. The second rolling element rolls on the second inclined surface when the cam mechanism is disposed at the second locking position.

  According to this configuration, when the door is closed, the cam mechanism is arranged at the second locking position, and the door rotates about the rotation axis. At this time, the second rolling element rolls on the second inclined surface and the door is lifted. When the door is further closed, the cam mechanism moves from the second locking position to the first locking position, and the door rotates while sliding. At this time, the first rolling element rolls on the first inclined surface and is guided in a direction in which the door is closed by its own weight.

  According to the present invention, in the door opening / closing mechanism configured as described above, the rotation shaft of the second rolling element is disposed on a line passing through the rotation center of the door when the cam mechanism is disposed at the second locking position. It is a feature. According to this configuration, the direction of rolling friction of the second rolling element coincides with the moving direction of the second rolling element.

  According to the present invention, in the door opening / closing mechanism configured as described above, when the first rolling element rolls on the first inclined surface, the second rolling element is on the side on which the door and the second inclined surface of the device main body are arranged. When the second rolling element rolls on the second inclined surface, the first rolling element is not in contact with the door and the side on which the first inclined surface of the device body is disposed. It is said.

  According to this configuration, when the cam mechanism is arranged at the second locking position and the door rotates, the second rolling element rolls on the second inclined surface, and the first rolling element is not in contact with the door or the device main body. And does not slide. When the cam mechanism moves from the second locking position to the first locking position and the door rotates while sliding, the first rolling element rolls on the first inclined surface, and the second rolling element is a door or a device. Non-sliding with no contact with the main body.

  According to the present invention, the first rolling element is provided on one of the door and the apparatus main body, and the guide part is provided on the other. Therefore, the door is self-closed by its own weight when the first rolling element rolls in contact with the guide part. . Thereby, a door can be closed reliably. In addition, even if one of the doors arranged on both sides of the middle is closed vigorously, the other door is kept closed. Therefore, the other door does not open against the user's intention, and the usability of the device provided with the door opening / closing mechanism can be improved.

  According to the present invention, the hinge pin is guided by the hinge groove and the guide pin is guided by the guide groove so that the cam mechanism moves from the first locking position to the second locking position, and the rib and boss are moved at the second locking position. Therefore, when the door is opened, a cam mechanism that slides from the first locking position to the second locking position and pivotally supports the door at the second locking position can be easily realized.

  Moreover, according to this invention, since a guide part consists of a 1st inclined surface which descend | falls when closing a door, a door can be easily closed with dead weight. Further, since the rotating shaft of the first rolling element and the contour line of the first inclined surface are inclined with respect to the longitudinal direction of the closed door, the cam mechanism moves relatively between the first and second locking positions. Sliding friction between the first rolling element moving in the oblique direction and the first inclined surface can be reduced. Therefore, it is possible to reduce fluctuations in the operating force accompanied by awkward movements that are caught when the door is opened and closed, and to prevent abnormal noise during sliding and open the door smoothly.

  Further, according to the present invention, since the rotation axis of the first rolling element is arranged substantially perpendicular to the moving direction of the first rolling element that moves obliquely, the sliding friction between the first rolling element and the first inclined surface. Can be further reduced.

  According to the present invention, the second rolling element is provided on one of the door and the device main body, the second inclined surface is provided on the other, and the first rolling element is moved when the cam mechanism moves between the first and second locking positions. Rolls on the first inclined surface, and the second rolling element rolls on the second inclined surface when the cam mechanism is arranged at the second locking position. Therefore, the second rolling element is closed when the door is closed. After rolling on the second inclined surface and the door ascending, the first rolling element rolls on the first inclined surface, the door descends and self-closes by its own weight. Thereby, a collision with the 1st rolling element and the edge part of a 1st inclined surface can be avoided, a door can be raised / lowered smoothly, and the operativity of a door opening / closing mechanism can be improved.

  Further, according to the present invention, since the rotation shaft of the second rolling element is arranged on a line passing through the rotation center of the door when the cam mechanism is arranged at the second locking position, the second rolling element and the second inclined surface are arranged. And sliding friction can be reduced.

  Further, according to the present invention, when the first rolling element rolls on the first inclined surface, the second rolling element is not in contact with the door or the device main body, so that the sliding friction of the second rolling element is avoided. be able to. Moreover, since the 1st rolling element becomes non-contact with a door or an apparatus main body when a 2nd rolling element rolls on the 2nd inclined surface, generation | occurrence | production of the sliding friction of a 1st rolling element can be avoided.

  Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a top sectional view showing a door opening / closing mechanism according to the first embodiment. An opening 1a is provided in the main body 1 of a refrigerator or the like. The opening 1 a is covered with the left door 2 on the left side and the right door 3 on the right side with respect to the middle. At one end of the left door 2 and the right door 3, there are provided handles 4 and 5 that are gripped by the user.

  The other ends of the left door 2 and the right door 3 are pivotally supported by rotating shafts 1b and 1c that slide relative to the left door 2 and the right door 3 by a cam mechanism, as will be described later. It can be gripped and opened on both sides. Further, packings 6 and 7 are attached to the gaps between the left door 2 and the right door 3, respectively. Magnets (not shown) are embedded in the packings 6 and 7 and are attracted to each other to seal the gap.

  The left door 2 and the right door 3 have door plates 49 and 50 that cover the front surface, and door backs 47 and 48 that are provided on the back surface side. The door plates 49 and 50 and the door backs 47 and 48 are connected to each other by a door cap (not shown) arranged on the upper and lower sides and a side plate (not shown) arranged on the side surface to block the periphery. And after inject | pouring a urethane foaming agent inside, it heats and a foaming urethane resin is filled. Thereby, the inside of the main body 1 is insulated and insulated.

  Packings 41 and 44 are attached to the peripheral portions of the door backs 47 and 48, respectively. Flexible magnets (not shown) are embedded in the packings 41 and 44, and the main body 1 is attracted to keep the left door 2, the right door 3, and the main body 1 sealed. .

  FIG. 2 is a top view showing the lower side of the left door 2 and the right door 3. The bottom surface of the opening 1 a extends forward by an angle (not shown) attached to the main body 1. On the angle, first and second inclined surfaces 60 and 62 and a horizontal surface 61 are formed at substantially central portions in the left-right direction of the left door 2 and the right door 3.

  FIG. 3 shows an AA cross section. The first inclined surface 60 descends rearward, and the second inclined surface 62 descends forward. The horizontal surface 61 connects the protruding end portions of the first and second inclined surfaces 60 and 62. Further, the first and second inclined surfaces 60 and 62 are provided so that the contour lines are inclined with respect to the longitudinal direction of the left door 2 and the right door 3 in a closed state.

  Rollers 63 (first rolling elements) are provided on the lower surfaces of the left door 2 and the right door 3 so as to roll on the first and second inclined surfaces 60 and 62 and the horizontal plane 61 and rotate around the rotation shaft 63a. The rotation shaft 63a of the roller 63 is arranged in parallel with the contour lines of the first and second inclined surfaces 60 and 62, and is inclined with respect to the longitudinal direction of the left door 2 and the right door 3 in the closed state.

  Cam mechanisms having the same structure are provided at four locations, the upper part of the left door 2, the lower part of the left door 2, the upper part of the right door 3, and the lower part of the right door 3. FIG. 4 is a front sectional view showing a part of the cam mechanism arranged at the lower part of the left door 2. The cam mechanism consists of members provided on the left door 2 and the main body 1 and engages with each other. A slide cam member 8 disposed on the shaft side and a guide cam 53 (see FIG. 5) disposed on the open side are attached to the left door 2. A lock cam assembly 32 that engages with the slide cam member 8 and a guide pin 51 (see FIG. 5) that engages with the guide cam 53 are attached to the main body 1.

  The slide cam member 8 is made of a resin molded product, and bosses 8a and 8b are projected from the upper surface and screw holes 8c and 8d are provided therethrough. The bosses 8a and 8b are fitted into boss holes (not shown) provided on the lower surface of the left door 2, and tapping screws (not shown) are inserted into the screw holes 8c and 8d from below in the figure, and the slide cam member 8 is inserted. Is attached to the lower surface of the left door 2. The slide cam member 8 is formed with a boss hole 8f for positioning a lock member 16 described later.

  In the lock cam assembly 32, the lock cam member 18 and the angle 22 are integrated by a screw 31, and engage with the slide cam member 8 to constitute a part of the cam mechanism. The lock cam member 18 is made of a resin molded product, and the angle 22 is made of a metal member to support the weight of the left door 2.

  The angle 22 is formed with screw holes 22a at three locations. A tapping screw (not shown) is inserted into the screw hole 22a, and the angle 22, that is, the lock cam assembly 32 is attached to the main body 1. Further, a hinge pin 23, a lock pin 24, and an auxiliary guide pin 25 made of a metal such as stainless steel are caulked and integrated with the angle 22, respectively. The hinge pin 23, the lock pin 24, and the auxiliary guide pin 25 pass through the lock cam member 18 and protrude upward in the drawing.

  A plan view of the cam mechanism is shown in FIG. The figure shows a state in which the left door 2 is closed. In addition, in the plan view for explaining the cam mechanism below, each part of the cam mechanism provided at the lower part of the left door 2 should be originally represented by a broken line, but is represented by a solid line for convenience. Further, the members provided on the main body 1 side are hatched.

  A lock member 16 is attached to the slide cam member 8. The lock member 16 is made of a resin molded product, and a boss (not shown) protruding on the upper surface is fitted into a boss hole 8f (see FIG. 4) provided on the lower surface of the slide cam member 8, and a tapping screw (not shown). ) Etc.

  An arm portion 16 a extends from one end of the lock member 16. The arm portion 16a is elastically deformed with respect to a load in a direction substantially perpendicular to the extending direction. An engaging portion 16b that engages with the lock pin 24 is provided at the end of the arm portion 16a. The other end of the lock member 16 is provided with a restricting portion 16c that abuts against a stopper 18e formed on the lock cam member 18 (see FIG. 4) and restricts the rotation of the left door 2.

  A long-hole hinge groove 9 is formed in the lower surface of one end of the slide cam member 8. Around the hinge groove 9, a boss 10 having a cylindrical surface 10 a centering on a hinge pin 23 at the second locking position described later is projected.

  A rib 19 having a cylindrical concave surface 19 a concentric with the hinge pin 23 protrudes from the lock cam member 18 around the hinge pin 23. An auxiliary guide groove 11 bent in an L shape is recessed in the center of the opening 1a (see FIG. 1) with respect to the hinge groove 9. The auxiliary guide groove 11 has a guide portion 11a and a relief portion 11b. The guide portion 11a relatively guides the auxiliary guide pin 25 from a first locking position described later to a second locking position. One end of the escape portion 11b is opened, and the auxiliary guide pin 25 is released at the second locking position to release the engagement between the auxiliary guide groove 11 and the auxiliary guide pin 25.

  A guide cam 53 attached to the open side of the left door 2 is made of a resin molded product, and a bent guide groove 52 is formed. For example, a stainless steel guide pin 51 that engages with the guide groove 52 is attached to the main body 1 while being supported by an angle (not shown).

  The guide groove 52 has a guide portion 52a and a relief portion 52b. The guide portion 52a relatively guides the guide pin 51 from a first locking position described later to a second locking position. One end of the escape portion 52 b is opened, and the guide pin 51 is released at the second locking position to release the engagement between the guide groove 52 and the guide pin 51. An arc portion 52c extending in the circumferential direction around the hinge pin 23 at the first locking position is formed at the end of the guide portion 52a.

  Next, the operation of the cam mechanism below the left door 2 will be described with reference to FIGS. The same operation is performed for the other cam mechanisms. As described above, FIG. 5 shows a state in which the left door 2 is closed. In the closed state of the left door 2, the hinge pin 23 is locked to one end of the hinge groove 9, and the cam mechanism takes the first locking position. In the first locking position, the guide pin 51 is disposed at the end of the guide portion 52 a of the guide groove 52. The auxiliary guide pin 25 is disposed at the end of the guide portion 11 a of the auxiliary guide groove 11.

  Since the arc portion 52c of the guide groove 52 is formed on an arc centering on the hinge pin 23 at the first locking position, the left door 2 is rotated in the closing direction with the hinge pin 23 as a pivot at the first locking position. Can move. Therefore, the left door 2 at the first locking position can be reliably closed. At this time, the guide portion 11a of the auxiliary guide groove 11 and the auxiliary guide pin 25 are in contact with each other so that the rotation of the left door 2 is not restricted so that the guide pin 25 and the guide portion 11a are not in the first locking position. Are provided with gaps A1 and A2 in the longitudinal direction and the width direction of the groove.

  The lock pin 24 engages with the engagement portion 16b of the lock member 16, and the left door 2 is urged toward the right door 3 (see FIG. 1) by the elastic force of the arm portion 16a. Accordingly, a predetermined amount of gap between the left door 2 and the right door 3 is securely held, and the left door 2 is prevented from being loosened by a gap for fitting between the hinge pin 23 and the hinge groove 9. . Therefore, the cam mechanism maintains the state of the first locking position and further ensures the closed and sealed state of the left door 2.

  2, the roller 63 is disposed on the first inclined surface 60, and the left door 2 receives a force in a direction perpendicular to the contour line of the first inclined surface 60 when viewed in plan by its own weight. Thereby, the 1st inclined surface 60 comprises the guide part which guides the left door 2 in the direction closed by dead weight, and the left door 2 is guided in the direction of the close and the right door 3. As shown in FIG. Therefore, the closed and sealed state of the left door 2 can be further ensured.

  When the left door 2 starts to open by gripping the handle 4 (see FIG. 1), the left door 2 rotates with the opening, but the guide portion 52a of the guide groove 52 engages with the guide pin 51, so that the first In the locked position, the hinge pin 23 cannot be rotated as an axis. For this reason, the hinge pin 23 is relatively guided to the hinge groove 9 and the guide pin 51 is relatively guided to the guide portion 52a. Further, the relative movement of the auxiliary guide pin 25 is not restricted by the gap A2 provided in the guide portion 11a of the auxiliary guide groove 11.

  As a result, the left door 2 slides in a direction away from the right door 3 (left direction) while rotating. Accordingly, the packing 6 provided on the left door 2 is separated from the packing 7 provided on the right door 3 to prevent the packing 6 and 7 from sliding and prevent damage, and by reducing the sliding friction, the opening operating force is reduced. Is reduced.

  At this time, the roller 63 rolls on the first inclined surface 60 and then rolls on the horizontal plane 61. Thereby, the left door 2 rises and rotates. Therefore, the left door 2 is kept closed, and the left door 2 can be opened only when a large operating force is applied to pull the handle 4.

  Since the left door 2 slides and moves to the left while rotating by the cam mechanism, the roller 63 moves in an oblique direction with respect to the longitudinal direction of the left door 2. Since the contour lines of the rotating shaft 63a of the roller 63 and the first inclined surface 60 are arranged obliquely with respect to the longitudinal direction of the left door 2, the moving direction of the roller 63 and the direction of rolling friction substantially coincide.

  Thereby, the sliding friction of the roller 63 can be reduced, and the fluctuation of the operation force accompanied by the awkward movement that is caught when the left door 2 is opened can be reduced. Moreover, the abnormal sound at the time of sliding can be prevented and the left door 2 can be opened smoothly. Furthermore, it is possible to reduce wear and damage on the portion where the roller 63 and the rotating shaft 63a slide. Similarly, when the left door 2 is closed, it is possible to reduce fluctuations in operating force and prevent abnormal sounds. Sliding friction can be further reduced if the contour lines of the rotating shaft 63a of the roller 63 and the contour lines of the first inclined surface 60 are provided substantially perpendicular to the moving direction of the roller 63.

  Further, the arm portion 16a of the lock member 16 is elastically deformed, and the disengagement between the lock pin 24 and the engagement portion 16b is started. When the handle 4 is released at this time, the left door 2 returns to the state shown in FIG. 5 by the elastic force of the arm portion 16a. Therefore, the lock member 16 and the lock pin 24 have a self-closing function so that the left door 2 can be reliably closed.

  When the left door 2 slides while rotating, the state shown in FIG. 6 is obtained. The hinge pin 23 is locked to the other end of the hinge groove 9, and the cam mechanism takes the second locking position. Further, the cylindrical surface 10 a of the boss 10 starts to slide along the concave surface 19 a of the rib 19.

  At this time, the roller 63 is disposed on the boundary line between the horizontal surface 61 and the second inclined surface 62. Further, the guide pin 51 and the auxiliary guide pin 25 are arranged at the intersection positions of the guide portions 52a and 11a and the escape portions 52b and 11b of the guide groove 52 and the auxiliary guide groove 11, respectively. The relief portions 52b and 11b of the guide groove 52 and the auxiliary guide groove 11 are formed in an arc shape centering on the hinge pin 23 at the second locking position. Accordingly, the guide pin 51 and the auxiliary guide pin 25 are relatively released and the rotation of the left door 2 is guided, so that the second locking position is securely held.

  When the left door 2 is further opened, the state shown in FIG. 7 is obtained. The cylindrical surface 10 a of the boss 10 slides at two locations on the concave surface 19 a of the rib 19, and the boss 10 cannot move in the longitudinal direction of the hinge groove 9. Thereby, the cam mechanism maintains the state of the second locking position, and the left door 2 is pivotally supported. The concave surface 19 a of the rib 19 only needs to guide the boss 10. For this reason, instead of the rib 19, for example, a plurality of pins arranged along a circular arc concentric with the hinge pin 23, a polygonal surface arranged along the circular arc, or the like may be used.

  Further, the left door 2 rotates while the guide groove 52 relatively guides the guide pin 51 and the cam mechanism holds the second locking position. Since the guide portion 11 a of the auxiliary guide groove 11 has gaps A 1 and A 2 (see FIG. 5) between the guide portion 11 a and the auxiliary guide pin 25, the guide portion 51 is engaged with the relief portion 52 b of the guide groove 52. After that, the engagement between the escape portion 11b of the auxiliary guide groove 11 and the auxiliary guide pin 25 is started.

  At this time, after the roller 63 rolls on the second inclined surface 62 and the left door 2 descends, the roller 63 and the second inclined surface 62 are separated by the rotation of the left door 2. Since the roller 63 rotates around the hinge pin 23 at the second locking position, the moving direction and the direction of rolling friction do not match.

  However, as the left door 2 opens, the end of the roller 63 begins to move away from the main body 1, and the contact length between the roller 63 and the second inclined surface 62 gradually decreases. For this reason, sliding friction of the roller 63 is suppressed, and fluctuations in operating force and abnormal noise during opening and closing are suppressed. It is more desirable that a part of the roller 63 is arranged so as to be separated from the main body 1 on the boundary line between the second inclined surface 62 and the horizontal surface 61. Thereby, the roller 63 can be released from the second inclined surface 62 at an early stage.

  When the left door 2 is further opened, the engagement between the guide groove 52 and the guide pin 51 is released as shown in FIG. In the cam mechanism, the auxiliary guide groove 11 relatively guides the auxiliary guide pin 25 to hold the second locking position, and the left door 2 rotates. Thereafter, the hinge pin 23 and the hinge groove 9 are engaged with each other, the boss 10 and the rib 19 are slid to hold the second locking position, and the left door 2 is rotated.

  When the left door 2 is further opened, the restricting portion 16c of the lock member 16 comes into contact with a stopper 18e formed on the lock cam member 18 (see FIG. 4), and the range of rotation of the left door 2 is restricted. Moreover, the left door 2 can be closed by the operation | movement reverse to the operation | movement shown to FIGS. 5-8 demonstrated above.

  According to the present embodiment, since the roller 63 is provided on the left door 2 and the first inclined surface 60 is provided on the main body 1, the roller 63 rolls on the first inclined surface 60 so that the left door 2 is caused by its own weight. Self-close. Thereby, while being able to close the left door 2 reliably, the improvement of the sealing performance between the left door 2 and the right door 3 can be aimed at. Moreover, even if the right door 3 is closed vigorously, the left door 2 is kept closed. Therefore, the left door 2 does not open against the user's intention, and the usability of the device provided with the door opening / closing mechanism can be improved.

  In addition, the hinge pin 23 is guided by the hinge groove 9 and the guide pin 51 is guided by the guide groove 52 so that the cam mechanism moves from the first locking position to the second locking position. Since the boss 10 is brought into sliding contact, a cam mechanism that slides from the first locking position to the second locking position when the left door 2 is opened and pivotally supports the left door 2 at the second locking position is easily realized. be able to.

  Also, by arranging the guide pin 51 on the open side of the left door 2 and the hinge pin 23 on the shaft side, the guide direction of the guide pin 51 by the guide groove 52 and the direction in which the operating force to open the left door 2 is applied. The angle formed is smaller than when the guide pin 51 is arranged on the shaft side. For this reason, sliding friction between the guide pin 51 and the guide groove 52 is reduced, and the operability of the door opening / closing mechanism can be improved by reducing the operating force when the door is opened / closed.

  Furthermore, since the cam mechanism is arranged separately on the shaft side and the open side of the left door 2, the positioning accuracy of the left door 2 is improved and the distance from the right door 3 is maintained with high accuracy. Thereby, generation | occurrence | production of the clearance gap between packings 6 and 7 can be prevented, and the sealing state by the left door 2 and the right door 3 can be stabilized.

  Further, since the contour lines of the rotation shaft 63a of the roller 63 and the first inclined surface 60 are inclined with respect to the longitudinal direction of the closed left door 2, the cam mechanism is relatively moved when moving between the first and second locking positions. Thus, sliding friction between the roller 63 moving in the oblique direction and the first inclined surface 60 can be reduced. Therefore, it is possible to reduce fluctuations in operating force accompanied by awkward movements that are caught when the door is opened and closed, and to prevent abnormal noise during sliding. Furthermore, it is possible to reduce wear and damage on the portion where the roller 63 and the rotating shaft 63a slide.

  Although the operation of the left door 2 is described in the present embodiment, the right door 3 has the same cam mechanism as that of the left door 2, and therefore the same effect as described above can be obtained.

  Alternatively, the roller 63 may be loosely fitted so as to be movable in the direction of the rotation shaft 63a. At this time, the distance that the roller 63 can move in the axial direction is made larger than the sliding movement amount of the left door 2 and the right door 3 when the cam mechanism shifts from the first locking position to the second locking position. Thereby, the sliding friction of the roller 63 can be further reduced.

  The roller 63 is loosely fitted so as to be movable in the direction of the rotating shaft 63a, and the direction of the rotating shaft 63a of the roller 63 and the direction of the contour lines of the first and second inclined surfaces 60, 62 are closed. You may make it substantially correspond to a longitudinal direction. Thereby, while being able to process the 1st, 2nd inclined surfaces 60 and 62 easily, the aesthetics of the main-body part 1 can be improved.

  Next, FIG. 9 is a plan view showing a cam mechanism of the door opening / closing mechanism of the second embodiment. For convenience of explanation, the same parts as those in the first embodiment shown in FIGS. The figure shows a state in which the left door 2 is closed. The present embodiment is different from the first embodiment in the configuration for raising and lowering the door. Other parts are the same as those of the first embodiment.

  The roller 63 (first rolling element) is disposed at the open end on the right side of the left door 2 in the left-right direction. The rotation shaft 63 a of the roller 63 is disposed obliquely with respect to the longitudinal direction of the left door 2. A roller 64 (second rolling element) is provided adjacent to the roller 63. The rotation shaft 64a of the roller 64 is arranged on a line passing through the center of the hinge pin 23 when the cam mechanism is arranged at the second locking position.

  The first inclined surface 60 is provided at a position where the roller 63 can contact and roll, and the rear side descends. The 2nd inclined surface 62 is provided in the position which the roller 64 can contact and can roll, and the front falls. The horizontal surface 61 connects the protruding end portions of the first and second inclined surfaces 60 and 62. The first and second inclined surfaces 60 and 62 are formed such that the contour lines are substantially parallel to the rotation shafts 63a and 64a of the rollers 63 and 64, respectively.

  A roller 63 and a roller 64 can roll on the horizontal surface 61, and a step is formed between the front end portion 61 a in contact with the roller 63 and the upper surface of an angle (not shown). In addition, a step is formed between the upper surface of the angle at the rear end 61 b in contact with the roller 64.

  Next, the operation when the left door 2 is opened will be described with reference to FIGS. In the closed state of the left door 2, the hinge pin 23 is locked to one end of the hinge groove 9, and the cam mechanism takes the first locking position. In the first locking position, the guide pin 51 is disposed at the end of the guide portion 52 a of the guide groove 52. The auxiliary guide pin 25 is disposed at the end of the guide portion 11 a of the auxiliary guide groove 11.

  Further, the roller 63 is disposed so as to be in contact with the end on the back side of the first inclined surface 60. As a result, the left door 2 cannot be opened with a weak force due to the contact between the roller 63 and the first inclined surface 60. Therefore, it is possible to prevent the left door 2 from opening when the right door 3 is closed with force. Further, since the roller 63 is arranged behind the end on the back side of the first inclined surface 60, the closed and sealed state of the left door 2 can be reliably maintained.

  When the left door 2 begins to open by gripping the handle 4 (see FIG. 1), the roller 63 rolls on the first inclined surface 60 and the left door 2 rises. At this time, the roller 64 is separated from the main body 1 and is in a non-contact state.

  Since the contour lines of the rotating shaft 63a of the roller 63 and the first inclined surface 60 are arranged obliquely with respect to the longitudinal direction of the left door 2, the moving direction of the roller 63 and the direction of rolling friction substantially coincide. Thereby, the sliding friction of the roller 63 can be reduced, and the fluctuation of the operation force accompanied by the awkward movement that is caught when the left door 2 is opened can be reduced. Moreover, the abnormal sound at the time of sliding is prevented and the left door 2 opens smoothly. Furthermore, it is possible to reduce wear and damage on the portion where the roller 63 and the rotating shaft 63a slide. Similarly, when the left door 2 is closed, it is possible to reduce fluctuations in operating force and prevent abnormal sounds. Sliding friction can be further reduced if the contour lines of the rotating shaft 63a of the roller 63 and the contour lines of the first inclined surface 60 are provided substantially perpendicular to the moving direction of the roller 63.

  When the left door 2 slides while rotating, the state shown in FIG. 10 is obtained. The hinge pin 23 is locked to the other end of the hinge groove 9, and the cam mechanism takes the second locking position. The cylindrical surface 10 a of the boss 10 starts to slide along the concave surface 19 a of the rib 19. The guide pin 51 and the auxiliary guide pin 25 are arranged at the intersection positions of the guide portions 52a and 11a and the escape portions 52b and 11b of the guide groove 52 and the auxiliary guide groove 11, respectively.

  At this time, the roller 63 is disposed on the boundary line between the first inclined surface 60 and the horizontal surface 61. The roller 64 is disposed at a position that substantially overlaps the end 61 b behind the horizontal surface 61. Since the roller 64 starts contact with the horizontal surface 61 in a state where the roller 63 rides on the horizontal surface 61 and lifts the left door 2, the rolling of the roller 64 can be started smoothly. Similarly, when the left door 2 is closed, since the roller 63 starts to contact the horizontal surface 61 while the roller 64 is on the horizontal surface 61 and lifts the left door 2, the roller 63 starts to roll smoothly. Can be made.

  When the left door 2 is further opened, the rollers 63 and 64 roll on the horizontal plane 1. At this time, since the rotating shaft 64a of the roller 64 is arranged on a line passing through the center of the hinge pin 23, the moving direction of the roller 64 and the direction of rolling friction are substantially coincident. Thereby, the sliding friction of the roller 64 can be reduced and the fluctuation | variation of the operation force accompanying the awkward operation | movement which is caught when opening the left door 2 can be reduced. Moreover, the abnormal sound at the time of sliding is prevented and the left door 2 opens smoothly. Furthermore, it is possible to reduce wear and damage on the portion where the roller 64 and the rotating shaft 64a slide. Similarly, when the left door 2 is closed, it is possible to reduce fluctuations in operating force and prevent abnormal sounds.

  In addition, although the moving direction of the roller 63 and the direction of rolling friction differ, since the depth of the horizontal surface 61 ahead of the 1st inclined surface 60 is made small, the increase in operating force and generation | occurrence | production of abnormal sound can be reduced. Further, the rotation shaft 64 a of the roller 64 may be arranged so as to approximately match the center line of the hinge pin 23 without passing through the center of the hinge pin 23. For example, the rotation shaft 64 may be arranged so as to substantially coincide with the left-right direction of the refrigerator 1. Since the sliding friction of the roller 64 which increases with this is very small, there is little influence at the time of door opening and closing.

  When the left door 2 is further opened, the roller 64 rolls on the second inclined surface 62. The roller 63 is separated from the horizontal plane 61 and is not in contact with the main body 1. At this time, since the moving direction of the roller 64 and the direction of rolling friction substantially coincide, the sliding friction of the roller 64 can be reduced. Thereby, the fluctuation | variation of the operation force accompanying the awkward operation | movement which is caught when opening the left door 2 can be reduced. Moreover, the abnormal sound at the time of sliding is prevented and the left door 2 opens smoothly. Furthermore, it is possible to reduce wear and damage on the portion where the roller 64 and the rotating shaft 64a slide.

  When the roller 64 descends the second inclined surface 62 and further opens the left door 2, the engagement between the guide groove 52 and the guide pin 51 is released as shown in FIG. In the cam mechanism, the auxiliary guide groove 11 relatively guides the auxiliary guide pin 25 to hold the second locking position, and the left door 2 rotates. Thereafter, the hinge pin 23 and the hinge groove 9 engage with each other, the boss 10 and the rib 9 slide to hold the second locking position, and the left door 2 rotates.

  According to this embodiment, the same effect as that of the first embodiment can be obtained. The roller 63 rolls on the first inclined surface 60 when the cam mechanism moves between the first and second locking positions, and the roller 64 rotates when the cam mechanism is arranged at the second locking position. Since it rolls on the second inclined surface 62, when the left door 2 is closed, the left door 2 rises due to the rolling of the roller 64, and then the left door 2 descends due to the rolling of the roller 63 and self-closes due to its own weight. Is done. Thereby, the collision with the roller 63 and the edge part 61a (the edge part of the 1st inclined surface 60 when the horizontal surface 61 is not provided) of the horizontal surface 61 can be avoided, and the left door 2 can be raised / lowered smoothly, The operability of the opening / closing mechanism can be improved.

  In addition, since the roller 64 is not in contact with the main body 1 when the roller 63 rolls on the first inclined surface 60, the sliding friction of the roller 64 can be avoided. Further, since the roller 63 is not in contact with the main body 1 when the roller 64 rolls on the second inclined surface 62, generation of sliding friction of the roller 63 can be avoided.

  Moreover, since the continuous horizontal surface 61 was provided in the edge part by the side of the protrusion of the 1st, 2nd inclined surfaces 60 and 62, when the left door 2 is closed, the rolling of the roller 63 can be started smoothly. Moreover, when the left door 2 is opened, the rolling of the roller 64 can be started smoothly. The horizontal plane that continues to the first inclined surface 60 and the horizontal plane that continues to the second inclined surface 62 may be divided.

  In addition, it is more desirable to form the contour lines of the second inclined surface 62 radially with the hinge pin 23 at the second locking position as the center. Thereby, the sliding friction of the roller 64 can further be reduced. Further, since the roller 63 is accompanied by rotation and slide movement when rolling on the first inclined surface 60, the rotation shaft 63a and the first inclination in a direction perpendicular to the average movement direction during rolling. Contour lines of the surface 60 may be provided.

  Further, when the load on the left door 2 is large, a plurality of rollers 63 and 64 may be provided. Furthermore, it is more preferable that the first inclined surface 60 is provided to extend rearward and that the front side is gently inclined and the back side is inclined suddenly. Thereby, while the left door 2 has self-closing property in the wide range, it can fully have the locking property which hold | maintains the closed state.

  In addition, the rollers 63 and 64 and the first and second inclined surfaces 60 and 62 are provided on the open side of the left door 2, but the same configuration is additionally provided on the shaft side from the central portion of the left door 2. May be. Thereby, the load of the left door 2 can be supported equally, and opening / closing operation | movement can be made smoother. Further, the rollers 63 and 64 and the first and second inclined surfaces 60 and 62 may be provided in the central portion of the left door 2. Thereby, the load of the left door 2 can be supported uniformly.

  In addition, although the operation | movement of the left door 2 is demonstrated above, since the right door 3 also has the cam mechanism similar to the left door 2, the effect similar to the above can be acquired.

  Next, FIG. 12 is a plan view showing a cam mechanism of the door opening / closing mechanism of the third embodiment. For convenience of explanation, the same parts as those in the second embodiment shown in FIGS. The figure shows a state in which the cam mechanism of the left door 2 is arranged at the second locking position. In this embodiment, the arrangement of the rollers 63 and 64 and the first and second inclined surfaces 60 and 62 is different from that of the second embodiment. Further, the auxiliary guide pin 25 and the auxiliary guide groove 11 are omitted, and the arrangement of the guide pin 51 and the guide groove 52 is different. Other parts are the same as those of the second embodiment.

  The guide groove 52 is formed in the slide cam member 8 in which the boss 10 is formed, and is disposed on the shaft side with respect to the central portion in the left-right direction of the left door 2. The hinge pin 23 and the guide pin 51 are guided relative to the hinge groove 9 and the guide groove 52, and the cam mechanism moves between the first locking position and the second locking position. Therefore, the number of parts of the door opening / closing mechanism can be reduced as compared with the second embodiment. Similarly in the first embodiment, the guide pins 51 and the guide grooves 52 may be arranged.

  The roller 63 (first rolling element) is arranged on the shaft side of the left door 2 in the left-right direction center. The rotating shaft 63a of the roller 63 is disposed obliquely with respect to the longitudinal direction of the left door 2, and the roller 63 moves in the direction in which the cam mechanism moves from the first locking position to the second locking position. It is almost vertical. A roller 64 (second rolling element) is provided adjacent to the open side of the left door 2 with respect to the roller 63. The rotation shaft 64a of the roller 64 is arranged on a line passing through the center of the hinge pin 23 when the cam mechanism is arranged at the second locking position.

  The first inclined surface 60 is provided at a position where the roller 63 can contact and roll, and the rear side descends. The 2nd inclined surface 62 is provided in the position which the roller 64 can contact and can roll, and the front falls. The horizontal surface 61 connects the protruding end portions of the first and second inclined surfaces 60 and 62. The first and second inclined surfaces 60 and 62 are formed such that the contour lines are substantially parallel to the rotation shafts 63a and 64a of the rollers 63 and 64, respectively. It is more desirable to form the contour lines of the second inclined surface 62 radially with the hinge pin 23 at the second locking position as the center.

  A roller 63 and a roller 64 can roll on the horizontal surface 61, and a step is formed between the front end portion 61 a in contact with the roller 63 and the upper surface of an angle (not shown). In addition, a step is formed between the upper surface of the angle at the rear end 61 b in contact with the roller 64.

  When the left door 2 is closed, the roller 63 is disposed so as to be in contact with the back end of the first inclined surface 60. As a result, the left door 2 cannot be opened with a weak force due to the contact between the roller 63 and the first inclined surface 60. Therefore, it is possible to prevent the left door 2 from opening when the right door 3 is closed with force. Further, since the roller 63 is arranged behind the end on the back side of the first inclined surface 60, the closed and sealed state of the left door 2 can be reliably maintained.

  When the left door 2 is opened, the cam mechanism shifts from the first locking position to the second locking position. At this time, the roller 63 rolls on the first inclined surface 60 and the left door 2 rises. Further, the roller 64 is separated from the main body 1 and is in a non-contact state.

  When the cam mechanism is in the second locking position, the state shown in FIG. At this time, the roller 63 is disposed on the boundary line between the first inclined surface 60 and the horizontal surface 61. The roller 64 is disposed at a position that substantially overlaps the end 61 b behind the horizontal surface 61.

  When the left door 2 is further opened, the rollers 63 and 64 roll on the horizontal plane 1. At this time, since the rotating shaft 64a of the roller 64 is arranged on a line passing through the center of the hinge pin 23, the moving direction of the roller 64 and the direction of rolling friction are substantially coincident. Thereby, the sliding friction of the roller 64 can be reduced to reduce fluctuations in the operating force when the left door 2 is opened, and abnormal noise during sliding can be prevented. Similarly, when the left door 2 is closed, it is possible to reduce fluctuations in operating force and prevent abnormal sounds.

  In addition, although the moving direction of the roller 63 and the direction of rolling friction differ, since the depth of the horizontal surface 61 ahead of the 1st inclined surface 60 is made small, the fluctuation | variation of operating force and generation | occurrence | production of abnormal sound can be decreased.

  When the left door 2 is further opened, the roller 64 rolls on the second inclined surface 62. The roller 63 is separated from the horizontal plane 61 and is not in contact with the main body 1. At this time, since the moving direction of the roller 64 and the direction of rolling friction substantially coincide, the sliding friction of the roller 64 can be reduced. Thereby, the fluctuation | variation of the operating force at the time of opening the left door 2 can be reduced, and the abnormal sound at the time of sliding can be prevented.

  When the roller 64 moves down the second inclined surface 62 and further opens the left door 2, the engagement between the guide groove 52 and the guide pin 51 is released. Thereafter, the hinge pin 23 and the hinge groove 9 engage with each other, the boss 10 and the rib 9 slide to hold the second locking position, and the left door 2 rotates.

  According to this embodiment, the same effect as that of the second embodiment can be obtained. Although the operation of the left door 2 has been described in the present embodiment, the right door 3 has the same cam mechanism as that of the left door 2, and thus the same effect can be obtained.

  In the second and third embodiments, the rollers 63 and 64 may be loosely fitted so as to be movable in the direction of the rotation shafts 63a and 64a. At this time, the axially movable distance of the rollers 63 and 64 is made larger than the sliding movement amount of the left door 2 and the right door 3 when the cam mechanism shifts from the first locking position to the second locking position. . Thereby, the sliding friction of the rollers 63 and 64 can be further reduced.

  Further, in the first to third embodiments, the main body portion 1 in each combination of the hinge pin 23 and the hinge groove 9, the guide pin 51 and the guide groove 52, the rib 19 and the boss 10, and the auxiliary guide pin 25 and the auxiliary guide groove 11. As long as it is provided on one side and the other side on the side and door side, it may be provided on either side.

  Moreover, although the rolling element which consists of the cylindrical rollers 63 and 64 which have a rotating shaft is demonstrated, the rolling element which consists of a rotatable spherical body may be sufficient. The spherical body is rotatably provided with its surface supported by a support body that covers the lower side than the center, such as a ballpoint ball. At this time, since the sphere supports the door at a single point, it is more preferable to use the door with a relatively small weight or when the surface with which the sphere contacts is hard such as metal.

  INDUSTRIAL APPLICABILITY The present invention can be used for a refrigerator or the like having a door opening / closing mechanism that opens and closes doors on both sides around the middle of an opening of a refrigerator storage room or the like.

1 is a top sectional view showing a door opening / closing mechanism according to a first embodiment of the present invention. The top view which shows the lower part of the left door of the door opening / closing mechanism of 1st Embodiment of this invention, and the right door. AA sectional view of FIG. Front sectional drawing which shows a part of cam mechanism of the door opening / closing mechanism of 1st Embodiment of this invention. The top view which shows operation | movement of the cam mechanism of the door opening / closing mechanism of 1st Embodiment of this invention. The top view which shows operation | movement of the cam mechanism of the door opening / closing mechanism of 1st Embodiment of this invention. The top view which shows operation | movement of the cam mechanism of the door opening / closing mechanism of 1st Embodiment of this invention. The top view which shows operation | movement of the cam mechanism of the door opening / closing mechanism of 1st Embodiment of this invention. The top view which shows operation | movement of the cam mechanism of the door opening / closing mechanism of 2nd Embodiment of this invention. The top view which shows operation | movement of the cam mechanism of the door opening / closing mechanism of 2nd Embodiment of this invention. The top view which shows operation | movement of the cam mechanism of the door opening / closing mechanism of 2nd Embodiment of this invention. The top view which shows operation | movement of the cam mechanism of the door opening / closing mechanism of 3rd Embodiment of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Main-body part 1a Opening part 2 Left door 3 Right door 4, 5 Handle 6, 7 Packing 8 Slide cam member 9 Hinge groove 10 Boss 11 Auxiliary guide groove 16 Lock member 18 Lock cam member 19 Rib 23 Hinge pin 24 Lock pin 25 Auxiliary guide pin 32 Lock cam assembly 47, 48 Door back 49, 50 Door plate 51 Guide pin 52 Guide groove 53 Guide cam 60 First inclined surface 61 Horizontal surface 62 Second inclined surface 63, 64 Roller 63a, 64a Rotating shaft

Claims (7)

  In a door opening / closing mechanism that opens and closes doors covering both sides with the middle of the opening of the device main body as a boundary, the door has a first locking position when the door is closed, and the door And a cam mechanism for pivotally supporting the door at the second locking position by sliding the door from the open side to the shaft side at the time of opening, and provided at one of the door and the device main body. A first rolling element capable of rolling, and a guide portion provided on the other side and guiding the door in a closing direction by its own weight by rolling in contact with the first rolling element. Opening and closing mechanism.   The cam mechanism guides the hinge pin that is a pivot shaft of the door when the door is opened, a guide pin disposed on either the door or the device body, and locks the hinge pin at both ends. The cam mechanism has a hinge groove that takes the first and second locking positions, a guide groove that guides the guide pin from the first locking position to the second locking position, and a circular arc that is coaxial with the hinge pin. The door opening / closing mechanism according to claim 1, further comprising: a rib disposed in a vertical direction; and a boss having a cylindrical surface in sliding contact with the rib at the second locking position.   The guide portion comprises a first inclined surface that descends when the door is closed by rolling in contact with the first rolling element, and the rotation axis of the first rolling element with respect to the longitudinal direction of the door in the closed state. The door opening / closing mechanism according to claim 1, wherein contour lines of the first inclined surface are inclined.   When the door is opened, the cam mechanism moves from the first locking position to the second locking position, the door slides while rotating, and the rotation axis of the first rolling element moves the first rolling element. The door opening / closing mechanism according to claim 3, wherein the door opening / closing mechanism is arranged substantially perpendicular to the direction.   A second rolling element which is arranged on one of the door and the device main body and can roll, and a second inclination which is arranged on the other and is raised when closing the door by rolling the second rolling element in contact with the second rolling element. A first rolling element rolls on the first inclined surface when the cam mechanism moves between the first locking position and the second locking position, and the cam mechanism is in the second relationship. The door opening / closing mechanism according to claim 3 or 4, wherein the second rolling element rolls on the second inclined surface when arranged at the stop position.   The door opening / closing mechanism according to claim 5, wherein a rotation shaft of the second rolling element is arranged on a line passing through a rotation center of the door when the cam mechanism is arranged at the second locking position.   When the first rolling element rolls on the first inclined surface, the second rolling element is not in contact with the side on which the second inclined surface of the door and the device main body is disposed, and the second rolling element is in the second inclined surface. The door according to claim 5 or 6, wherein the first rolling element is in non-contact with the side on which the first inclined surface of the door and the device main body is arranged when rolling on the surface. Opening and closing mechanism.

Images