JP2009047361A - Door opening and closing mechanism and refrigerator - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a door opening and closing mechanism capable of improving convenience, and a refrigerator using it. <P>SOLUTION: In the door opening and closing mechanism, a left door and a right door 3 with perpendicular rotary shafts are respectively provided on both sides in both sides of a middle part of an opening 1a, and the opening of an apparatus body 1 is opened and closed by rotating the left door 2 and the right door 3 using both ends of the opening 1a as shaft sides. Cam mechanisms taking a first engagement position when the left door 2 and the right door 3 are closed, and taking a second engagement position by sliding the left door 2 and the right door 3 from an opened side to the shaft side and rotatably supporting the left door 2 and the right door 3 in the second engagement position when the left door 3 and the right door 3 are opened, are provided in lower parts of the left door 2 and the right door 3. A door energizing means 12 having slopes 34b raising the left door 2 and the right door 3 when the cam mechanisms open the left door 2 and the right door 3 is provided for energizing the left door 2 and the right door 3 downward. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a door opening / closing mechanism having a self-closing function and a refrigerator having the door opening / closing mechanism.

  A conventional door opening / closing mechanism having a self-closing function is disclosed in Patent Document 1. In the door opening / closing mechanism, a door that rotates around a vertical rotation shaft is pivotally supported on an apparatus main body having an opening. A rotation shaft that protrudes from the top and bottom surfaces is provided at the opening of the device body, and a pivot hole that fits the rotation shaft is provided at the top and bottom surfaces of the door. On the seat surface of the lower rotation shaft and the lower surface of the door, slopes are provided in a predetermined rotation range so as to face each other.

  It rises when the door is opened by sliding of both slopes and descends when it is closed. At this time, when the user closes the door to the position where the slope slides, the door descends along the slope due to gravity. Therefore, the door has a self-closing property, and the convenience of the door opening / closing mechanism is improved.

Japanese Patent Application Laid-Open No. 2007-24460 (first page to third page, FIG. 14)

  However, according to the door opening / closing mechanism described above, when the weight of the door is reduced, the door does not self-close due to the frictional force between the rotation shaft and the pivotal support hole. Accordingly, there is a problem that the convenience of the door opening / closing mechanism is deteriorated.

  An object of this invention is to provide the door opening / closing mechanism which can improve the convenience, and a refrigerator using the same.

  In order to achieve the above object, the present invention provides a door opening / closing mechanism that opens and closes an opening of a device body by rotating a vertical door with a rotation shaft, and a slope that raises the door when the door is opened. The door urging means for urging the door downward is provided. According to this configuration, when the door is opened, the door rises against the biasing means by the slope. When the door is closed to the position where the slope slides, the door descends along the slope by the biasing force of the door biasing means and the gravity of the door. The slope may be provided on either the device main body side or the door side, or may be provided on both.

  According to the present invention, in the door opening / closing mechanism configured as described above, the door urging means includes an elastic plate that extends forward from the device main body and supports the rotation shaft of the door. According to this configuration, the rotation shaft is provided on the door or the device main body, and the elastic plate extending forward from the device main body supports the rotation shaft by fixing or fitting. The door is urged downward by the elastic plate via the rotation shaft.

  According to the present invention, in the door opening / closing mechanism having the above-described configuration, the doors are provided on both sides with the middle of the opening as a boundary, and the doors are opened and closed with both ends of the opening as axial sides. A cam mechanism that takes a first locking position when the door is opened, slides the door from the open side to the shaft side when the door is opened, takes a second locking position, and pivotally supports the door at the second locking position. Is provided in the lower part of the door, and the cam mechanism is provided with the slope.

  According to this configuration, the cam mechanism provided at the lower portion of the door 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 door is guided in the closing direction by its own weight by the slope provided in the cam mechanism.

  According to the present invention, in the door opening / closing mechanism configured as described above, the upper part of the door is rotatably supported, and the cam mechanism at the lower part of the door is moved from the first locking position to the second locking position. The upper part of the door is rotated without sliding to tilt the door. According to this configuration, the lower part of the door slides between the first and second locking positions by the cam mechanism when the door is opened and closed, and the upper part of the door only rotates. As a result, the doors are opened with the upper parts of the left and right doors approaching and the lower parts being separated.

  According to the present invention, in the door opening / closing mechanism having the above-described configuration, the doors are provided on both sides with the middle of the opening as a boundary, and the doors are opened and closed with both ends of the opening as axial sides. A cam mechanism that takes a first locking position when the door is opened, slides the door from the open side to the shaft side when the door is opened, takes a second locking position, and pivotally supports the door at the second locking position. Is provided at the upper and lower portions of the door, and the slope is provided in the cam mechanism disposed at the lower portion.

  According to this configuration, the cam mechanisms provided at the upper and lower portions of the door take 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 door is guided in the closing direction by its own weight by the slope provided in the cam mechanism. In addition, the pivot axis of the door moves in parallel when shifting to the first and second locking positions.

  According to the present invention, in the door opening / closing mechanism configured as described above, the cam mechanism includes a hinge pin that serves as a pivot shaft of the door when the door is opened, and guides the hinge pin to be locked at both ends. The mechanism guides the guide pin from the first locking position to the second locking position, the hinge groove taking the first and second locking positions, the guide pin disposed on either the door or the device main body. A guide groove; a rib arranged along a circular arc coaxial with the hinge pin; and a boss having a cylindrical surface that is in sliding contact with the rib at a second locking position, wherein the slope is the hinge pin facing each other. And at least one of the boss and the boss, and is provided in a predetermined angle range centered on the hinge pin at the first locking position.

  According to this configuration, for example, a hinge pin protrudes from one end of the device body, and a guide pin protrudes in parallel to the hinge pin at a predetermined distance from the hinge pin. 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 apparatus 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 in sliding 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 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.

  The slope is provided on one or both of the seating surface of the hinge pin and the axial end surface of the boss facing each other. For example, when slopes are provided on both the seat surface of the hinge pin and the boss, both slopes are provided in a plane arched range centering on the hinge pin and are in surface contact at the first locking position. When the door is opened and the cam mechanism shifts from the first locking position to the second locking position, the slopes of the respective slopes are displaced from each other in the arch-shaped center position and slide in point contact. When the door is closed and the sliding of the rib and the boss is released, the door can slide. At this time, the slope that makes point contact guides the door in the direction of surface contact by the weight of the door and the biasing force of the door biasing means, and guides the cam mechanism to the first locking position. The slope may be provided on one of the seat surface of the hinge pin and the boss, and the other may be a mountain-shaped protrusion that makes line contact with the slope at the first locking position. In addition, in each combination of a hinge pin and a hinge groove, and a guide pin and a guide groove, as long as it is provided in one and the other of the apparatus main body side and the door side, you may provide in any.

  According to the present invention, in the door opening / closing mechanism configured as described above, a hinge pin urging portion that urges the hinge pin in a direction arranged at the first locking position is provided. According to this configuration, the hinge pin is disposed at one end of the hinge groove at the first locking position, and is disposed at the other end of the hinge groove at the second locking position. The hinge pin is urged toward the one end by the hinge pin urging portion. When the door starts to close, the hinge pin urging portion pushes the hinge pin toward one end of the hinge groove to guide the cam mechanism to the first locking position.

  The refrigerator of the present invention includes the door opening / closing mechanism configured as described above and a door pivotally supported by the main body housing by the door opening / closing mechanism.

  According to the present invention, since the slope for raising the door when the door is opened and the door urging means for urging the door downward are provided, the door urged downward even if the weight of the door is small. The door can be closed by descending the slope. Therefore, the convenience of the door opening / closing mechanism can be improved.

  Further, according to the present invention, the door urging means is composed of an elastic plate that extends forward from the device main body and supports the rotation shaft of the door, so that the door urging means that easily urges the door without increasing the number of parts. Can be realized.

  According to the present invention, in the door opening / closing mechanism in which the doors are arranged on both sides with the middle of the opening as the boundary, the first locking position is taken when the door is closed, and the door is moved from the opening side to the shaft side when the door is opened. The door end surface has a packing or the like apart from the other door when the door is opened because the cam mechanism for pivotally supporting the door at the second locking position is provided at the lower part of the door. Interference can be prevented. Further, since the slope is provided in the cam mechanism, the door opening / closing mechanism in which the doors are arranged on both sides with the middle of the opening as a boundary can be easily provided with a self-closing property.

  Further, according to the present invention, the upper part of the door is pivotally supported so that the upper part of the door is not slid when the cam mechanism of the lower part of the door is shifted from the first locking position to the second locking position. Since the door is inclined, the configuration of the door opening / closing mechanism can be simplified. Further, even if the upper part of the door receives a force from the shaft side to the opening side due to the weight of the door, it can be easily self-closed because there is no sliding movement from the opening side to the shaft side when closing the door.

  According to the present invention, in the door opening / closing mechanism in which the doors are arranged on both sides with the middle of the opening as the boundary, the first locking position is taken when the door is closed, and the door is moved from the opening side to the shaft side when the door is opened. The cam mechanism that slides to the second locking position and pivotally supports the door at the second locking position is provided at the upper and lower parts of the door, so when opening the door, it has packing etc. apart from the other door Interference of the door end surface can be prevented. In addition, since the slope is provided in the lower cam mechanism, the door opening / closing mechanism in which the doors are arranged on both sides with the middle of the opening as a boundary can be easily provided with a self-closing property.

  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.

  In addition, since the slope is provided on one or both of the bearing surface of the hinge pin and the boss within a predetermined angle range centered on the hinge pin at the time of the first locking position, the cam mechanism at the second locking position is made to slide on the slope. Can lead to the first locking position. Therefore, the door opening / closing mechanism can be closed more reliably.

  According to the present invention, since the hinge pin urging portion for urging the hinge pin in the direction arranged at the first locking position is provided, the cam mechanism at the second locking position is moved by the urging of the hinge pin urging portion. It can be led to one locking position. Therefore, the door opening / closing mechanism can be closed more reliably.

  Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a side view showing the door opening / closing mechanism of the first embodiment. The door opening / closing mechanism of this embodiment is provided in a refrigerator. An opening (not shown) is provided in the main body 1 of the refrigerator. The front surface of the opening is covered by the door 20. An upper angle 21 and a lower angle 22 that support the upper and lower sides of the door 20 are attached to the main body 1 so as to protrude forward.

  FIG. 2 shows a detailed view of part A of FIG. The upper angle 21 is made of a metal plate, and a hinge pin 23 that is a rotation axis of the door 20 is fixed. The door 20 is provided with a fitting hole 20a into which the hinge pin 23 is fitted. A leaf spring 12 (biasing means) is sandwiched between the seating surface of the hinge pin 23 and the upper surface of the door 20. As a result, the door 20 is urged downward.

  FIG. 3 shows a detailed view of part B of FIG. The lower angle 22 is made of a metal plate, and a lower hinge member 14 having a hinge pin 24 (see FIG. 4) is attached thereto. An upper hinge member 13 that is in sliding contact with the lower hinge member 14 is attached to the lower surface of the door 20.

  FIG. 4 shows a perspective view of the lower angle 22 and the lower hinge member 14. The lower hinge member 14 is provided with a hinge pin 24 that protrudes upward and serves as a rotation axis of the door 20. On the seating surface of the hinge pin 24, a slope 14b is provided in a point-symmetric manner within a range of a predetermined angle α (see FIG. 6) with the hinge pin 24 as the center. A concave portion 14a and a convex portion 14c are formed by the slope 14b.

  FIG. 5 shows a perspective view of the upper hinge member 13. In the upper hinge member 13, a cylindrical portion 13 e embedded in the door 20 protrudes upward, and a fitting hole 13 d that engages with the hinge pin 24 is formed by the cylindrical portion 13 e. Around the fitting hole 13d on the lower surface of the upper hinge member 13, a slope 13b is provided point-symmetrically within the same angular range as the slope 14b centered on the fitting hole 13d. A convex portion 13a and a concave portion 13c are formed by the slope 13b.

  FIG. 6 is a plan view showing the upper hinge member 13 and the lower hinge member 14 with the door 20 closed. A hinge pin 24 is fitted into the fitting hole 13d, and the door 20 is rotatable. In the state where the door 20 is closed, the slope 13 b of the upper hinge member 13 contacts the slope 14 b of the lower hinge member 14.

  At this time, the convex portion 13a and the concave portion 14a are separated from each other, and the concave portion 13c and the convex portion 14c are separated from each other. As a result, the slopes 13b and 14b are brought into surface contact, and the door 20 is biased in a direction to close by its own weight. Therefore, the closed state of the door 20 can be reliably maintained.

  When the door 20 is opened in the direction indicated by the arrow C, the slopes 13b and 14b slide to lift the door 20 against its own weight and the urging force of the leaf spring 12 (see FIG. 2). When the door 20 rotates by a predetermined angle, the convex portion 13a rides on the convex portion 14c. Then, the convex part 13a slides with the convex part 14c, and the door 20 is opened.

  When closing the door 20, the slopes 13b and 14b slide after the convex part 13a slides with the convex part 14c. At this time, the door 20 is closed by its own weight and the urging force of the leaf spring 12 (see FIG. 2).

  According to the present embodiment, since the slopes 13b and 14b that are raised when the door 20 is opened and the leaf spring 12 (door urging means) that urges the door 20 downward are provided, the weight of the door 20 is small. However, the door 20 urged downward can be lowered by the slopes 13b and 14b and the door 20 can be closed by itself. Therefore, the convenience of the door opening / closing mechanism can be improved.

  The upper angle 21 that extends forward from the main body 1 and supports the pivot shaft of the door 20 is made of a metal plate, and thus constitutes an elastic plate having elasticity. Therefore, the leaf spring 12 may be omitted and the upper angle 21 may be disposed in contact with the door 20 or may be disposed in a gap smaller than the step of the slope 13b. Thereby, the upper angle 21 constitutes a door urging means for urging the door 20 downward without increasing the number of parts, and the door 20 can be self-closed.

  Alternatively, one of the slopes 13b and 14b may be a mountain-shaped protrusion that makes line contact with the other. Thereby, the sliding friction of slope 13b, 14b can be reduced.

  Next, FIG. 7 is a top sectional view showing the door opening / closing mechanism of the second embodiment. For convenience of explanation, the same parts as those in FIGS. 1 to 6 are given the same reference numerals. The door opening / closing mechanism of this embodiment is provided in a refrigerator. An opening 1a is provided in the main body 1 of the refrigerator. 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.

  Rotating shafts 1b and 1c are provided at the other ends of the left door 2 and the right door 3, and grips 4 and 5 are gripped to open 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. .

  The upper parts of the left door 2 and the right door 3 are configured similarly to the first embodiment shown in FIG. That is, the hinge pin 23 (see FIG. 2) is fitted to the left door 2 and the right door 3 to form the rotation shafts 1b and 1c. Further, the left door 2 and the right door 3 are urged downward by the leaf spring 12 (see FIG. 2). The left door 2 and the right door 3 may be urged downward by the upper angle 21 (see FIG. 2).

  Lower portions of the left door 2 and the right door 3 are supported by a lower angle 22 (see FIG. 3), and a cam mechanism having the same structure as that of the first embodiment is provided. The cam mechanism is provided on a cam member 8 (see FIG. 10) provided on the left door 2 and the right door 3 and a lower angle 22 provided on the main body 1 and engages with each other.

  8 and 9 are a perspective view and a plan view showing the lower angle 22 below the right door 3, respectively. A hinge pin 24 projects from the upper surface of the lower angle 33. A guide pin 51 protrudes in parallel with the hinge pin 24 on the open side of the right door 3 with respect to the hinge pin 24. Around the hinge pin 24, a rib 19 having a concave surface 19a made of a cylindrical surface concentric with the hinge pin 24 is projected.

  On the seating surface of the hinge pin 24, a slope 34b is provided in a point-symmetric manner within a range of a predetermined angle α with the hinge pin 24 as the center. A concave portion 34a and a convex portion 34c are formed by the slope 34b.

  FIG. 10 is a plan view showing the cam member 8 provided on the right door 3. Each member of the cam member 8 is provided on the lower surface of the right door 3, but is indicated by a solid line for convenience. The cam member 8 is formed with a guide groove 52 guided by a guide pin 51 (see FIG. 9). The guide groove 52 is bent in an L shape and has a guide portion 52a and a relief portion 52b. The guide 52a is guided by the guide pin 51 when the cam mechanism shifts from the first locking position to the second locking position, as will be described later. 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.

  A boss 33 projects from one end of the cam member 8. The peripheral surface of the boss 33 includes a cylindrical surface 33e, a flank surface 33f, and a connecting surface 33d. The cylindrical surface 33e is in sliding contact with the concave surface 19a of the rib 19 at a second locking position described later. The flank 33f avoids interference with the rib 19 at a first locking position described later. The connecting surface 33d connects the cylindrical surface 33e and the flank 33f.

  The boss 33 is provided with a long-hole hinge groove 9 that engages with the hinge pin 24. When the hinge pin 24 is relatively moved in the hinge groove 9 and is locked at both ends, the cam mechanism shifts to the first locking position and the second locking position.

  Around the hinge groove 9, there are formed a convex portion 33a and a concave portion 33c that face the concave portion 34a and the convex portion 34c, respectively, when the right door 3 is closed (first locking position). A stepped portion 33b protruding downward is provided at the step between the convex portion 33a and the concave portion 33c. The ridge line D at the top of the protrusion 33b is formed to face the slope 34b with the hinge pin 24 at the center when the right door 3 is closed (first locking position).

  FIG. 11 is a plan view showing the cam member 8 and the lower angle 22 with the right door 3 closed. The cam member 8 is indicated by a solid line, and the lower angle 22 is indicated by a broken line. In addition, each member provided in the lower angle 22 is hatched.

  In the state in which the right door 3 is closed, the cam mechanism takes the first locking position in which the hinge pin 24 is disposed at one end of the hinge groove 9 and the guide pin 51 is disposed at the end of the guide portion 52a of the guide groove 52. In the first locking position, the boss 33 is arranged with the flank 33 f facing the rib 19 and separated. Further, the ridge line D of the protrusion 33 b of the cam member 8 is in line contact with the slope 34 b of the lower angle 22.

  At this time, the convex portion 33a and the concave portion 34a are separated from each other, and the concave portion 33c and the convex portion 34c are separated from each other. Thereby, the slope 34b and the ridgeline D of the projection part 33b are in line contact, and the right door 3 is urged | biased in the direction closed by dead weight. Therefore, the closed state of the right door 3 can be reliably maintained.

  The cam member 8 is provided with a hinge pin urging portion 40. FIG. 12 is a plan view of the hinge pin urging portion 40. The hinge pin urging portion 40 is attached to the cam member 8 through the attachment hole 40a. At one end of the hinge pin urging portion 40, an arm portion 40b that is bent and elastically deformable in a plane is formed. The distal end 40c of the arm portion 40b is pressed against the hinge pin 24. As a result, the hinge pin 24 that can relatively move in the hinge groove 9 is urged in the direction arranged at the first locking position.

  When the right door 3 begins to open by gripping the handle 5 (see FIG. 7), the ridgeline D of the protrusion 33b and the slope 34b slide, and the right door 3 is self-weighted and the biasing force of the leaf spring 12 (see FIG. 2). Can be lifted against. Further, the right door 3 rotates with opening, but the guide portion 52a of the guide groove 52 engages with the guide pin 51, so that it cannot be rotated with the hinge pin 24 as an axis in the first locking position. . For this reason, the hinge pin 24 is relatively guided to the hinge groove 9 and the guide pin 51 is relatively guided to the guide portion 52a.

  As a result, the lower part of the right door 3 slides in a direction away from the left door 2 (right direction) while rotating. At this time, since the upper part of the right door 3 does not slide, the hinge pins 23 and 24 are inclined and the right door 3 is inclined so that the open end is lowered. Thereby, the packing 7 provided in the right door 3 is separated from the packing 6 provided in the left door 2. Accordingly, sliding of the packings 6 and 7 is avoided to prevent damage, and the opening operation force is reduced by reducing sliding friction.

  When the right door 3 slides while rotating, the state shown in FIG. 13 is obtained. The hinge pin 24 is locked to the other end of the hinge groove 9, and the guide pin 51 is arranged at the boundary between the guide portion 52 a and the relief portion 52 b of the guide groove 52. As a result, the cam mechanism takes the second locking position. Further, the cylindrical surface 10 a of the boss 10 starts sliding contact with the concave surface 19 a of the rib 19.

  When the right door 3 is further opened, the cylindrical surface 10 a of the boss 10 slides at two substantially opposite positions of the concave surface 19 a of the rib 19, and the boss 10 cannot move in the longitudinal direction of the hinge groove 9. As a result, the cam mechanism maintains the state of the second locking position, and the right door 3 is pivotally supported. The concave surface 19 a of the rib 19 only needs to guide the boss 10. For this reason, it may replace with the rib 19 and may arrange many pin-shaped ribs on the circular arc concentric with the hinge pin 24, for example. Moreover, you may form by the rib etc. which have the polygonal surface along the circular arc concentric with the hinge pin 24. FIG.

  Further, the escape portion 52b of the guide groove 52 is guided by the guide pin 51, and the right door 3 rotates while the cam mechanism holds the second locking position. Then, the engagement between the guide groove 52 and the guide pin 51 is released. In the cam mechanism, the hinge pin 24 and the hinge groove 9 engage with each other, and the boss 10 and the rib 19 slide to hold the second locking position.

  Then, the right door 3 is opened as shown in FIG. At this time, the convex part 33a rides on the convex part 34c and slides on each other. The left door 2 operates in the same manner. 13 and 14, the hinge pin urging portion 40 shows the arrangement of the first locking position, and the arm portion 40 b is elastically deformed and abuts against the hinge pin 24 at the second locking position.

  When closing the left door 2 and the right door 3, the cam mechanism moves from the second locking position to the first locking position by operating in reverse to the operations shown in FIGS. 11, 13, and 14 described above. . Further, after the convex portion 33a riding on the convex portion 34c slides with the convex portion 34c, the ridge line D of the protruding portion 33b and the slope 34b slide. At this time, the right door 3 is lowered and closed by its own weight and the urging force of the leaf spring 12 (see FIG. 2).

  Further, the tip 40c of the arm portion 40b of the hinge pin urging portion 40 urges the hinge pin 24 in the direction arranged at the first locking position. Thereby, the hinge pin urging portion 40 is urged in the direction in which the right door 3 is self-closed. Therefore, the door opening / closing mechanism can be closed more reliably.

  Moreover, since the protrusion 33b and the slope 34b are in line contact with each other at the first locking position, the self-closing property can be improved. That is, the ridgeline D of the protrusion 33b is formed around the hinge pin 24 at the first locking position. For this reason, the center of the ridgeline D and the center of the slope 34b are eccentric at the second locking position. Thereby, when the cam mechanism is in the second locking position, the ridge line D makes point contact with the slope 34b, and is guided in the direction of line contact by releasing the eccentricity. Therefore, the cam mechanism can be guided to the first locking position, and the door opening / closing mechanism can be more reliably self-closed. A slope may be provided on the door side and a protrusion may be provided on the main body 1 side.

  Further, the protrusion 33b may be a slope that makes surface contact with the slope 34b. In this case as well, if both the slopes slide when the cam mechanism is in the second locking position, the eccentricity is released and the surface is brought into contact with the surface. Therefore, the cam mechanism can be guided to the first locking position, and the door opening / closing mechanism can be more reliably self-closed.

  According to the present embodiment, as in the first embodiment, the slope 34b that rises when the left door 2 and the right door 3 are opened, and the leaf spring 12 (the door that urges the left door 2 and the right door 3 downward) Urging means) is provided, so that the left door 2 and the right door 3 that are urged downward even if the weight of the left door 2 and the right door 3 are small are lowered by the slope 34b, and the left door 2 and the right door 3 Can be closed automatically. Therefore, the convenience of the door opening / closing mechanism can be improved. The left door 2 and the right door 3 may be urged downward by the upper angle 21.

  Further, the first locking position is taken when the left door 2 and the right door 3 are closed, and the second locking position is taken by sliding the door from the open side to the shaft side when the left door 2 and the right door 3 are opened, Since the cam mechanism for pivotally supporting the left door 2 and the right door 3 at the second locking position is provided at the lower part of the left door 2 and the right door 3, the left door 2 and the right door 3 are separated from the other when opening the one. Thus, interference between the packings 6 and 7 can be prevented. Moreover, since the protrusion 33b and the slope 34b are provided in the cam mechanism, the door opening / closing mechanism in which the left door 2 and the right door 3 are arranged on both sides with the middle of the opening 1a as a boundary can be easily provided. .

  A cam mechanism similar to the lower part of the left door 2 and the right door 3 may also be provided on the upper part of the left door 2 and the right door 3. At this time, the protrusion 33b, the slope 34b, the protrusions 33a and 34c, and the recesses 33c and 34a do not need to be provided at the top. Even if it does in this way, the effect similar to the above can be acquired. However, it is more desirable to provide a cam mechanism that slides the left door 2 and the right door 3 only in the lower part of the left door 2 and the right door 3 as in the present embodiment.

  That is, when the lower cam mechanism shifts from the first locking position to the second locking position, the upper portions of the left door 2 and the right door 3 rotate without sliding to tilt the left door 2 and the right door 3. As a result, the configuration of the door opening / closing mechanism can be simplified. Moreover, the left door 2 and the right door 3 receive the force which an upper part goes to an open side from an axial side by dead weight. At this time, when the left door 2 and the right door 3 are closed, the upper part has no cam mechanism and does not involve sliding movement from the open side to the shaft side, so that it can be self-closed easily.

  INDUSTRIAL APPLICATION This invention can be utilized for the refrigerator etc. which have the door opening / closing mechanism which opens and closes the door which covers the opening part of a store room.

The side view which shows the refrigerator which has the door opening and closing mechanism of 1st Embodiment of this invention. Detailed view of part A in FIG. Detailed view of part B in FIG. The perspective view which shows the lower angle and lower hinge member of the door opening / closing mechanism of 1st Embodiment of this invention The perspective view which shows the upper hinge member of the door opening / closing mechanism of 1st Embodiment of this invention The top view which shows the upper hinge member and lower hinge member in the state which closed the door of the door opening / closing mechanism of 1st Embodiment of this invention. Top sectional drawing which shows the refrigerator which has the door opening and closing mechanism of 2nd Embodiment of this invention. The perspective view which shows the lower angle of the door opening / closing mechanism of 2nd Embodiment of this invention. The top view which shows the lower angle of the door opening / closing mechanism of 2nd Embodiment of this invention The top view which shows the cam member of the door opening / closing mechanism of 2nd Embodiment of this invention. The top view which shows the lower angle and cam member of the state which closed the door of the door opening / closing mechanism of 2nd Embodiment of this invention The top view which shows the hinge pin biasing part 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.

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 Cam member 9 Hinge groove 13 Upper hinge member 13
13a, 14c Convex part 13b, 14b Slope 13c, 14a Concave part 14 Lower hinge member 14
19 Rib 20 Door 21 Upper angle 22 Lower angle 23, 24 Hinge pin 33 Boss 33a, 34c Protruding part 33b Protruding part 33c, 34a Recessed part 34b Slope 47, 48 Door back 49, 50 Door plate 51 Guide pin 52 Guide groove D Edge line

Claims (8)

  In a door opening / closing mechanism that opens and closes an opening of a device body by rotating a door whose rotation axis is vertical, a slope that raises the door when the door is opened, and a door that biases the door downward And a door opening / closing mechanism provided with a biasing means.   2. The door opening / closing mechanism according to claim 1, wherein the door urging means comprises an elastic plate that extends forward from the device main body and supports a rotation shaft of the door.   The doors are provided on both sides with the middle of the opening as a boundary, each door opens and closes with both ends of the opening as axial sides, takes a first locking position when the door is closed, and the door When the door is opened, the door is slid from the open side to the shaft side to take a second locking position, and a cam mechanism for pivotally supporting the door at the second locking position is provided at the lower part of the door, The door opening / closing mechanism according to claim 1 or 2, further comprising a slope.   The upper part of the door is pivotally supported, and the upper part of the door rotates without sliding when the cam mechanism at the lower part of the door shifts from the first locking position to the second locking position. The door opening / closing mechanism according to claim 3, wherein the door is inclined.   The doors are provided on both sides with the middle of the opening as a boundary, each door opens and closes with both ends of the opening as axial sides, takes a first locking position when the door is closed, and the door When the door is opened, the door is slid from the open side to the shaft side to take the second locking position. The door opening / closing mechanism according to claim 1, wherein the slope is provided in the cam mechanism.   The cam mechanism includes a hinge pin serving as a rotation shaft of the door when the door is opened, and a hinge that guides the hinge pin and engages it at both ends so that the cam mechanism takes the first and second engagement positions. A groove, a guide pin arranged in one of the door and the device main body, a guide groove for guiding the guide pin from the first locking position to the second locking position, and an arc coaxial with the hinge pin And a boss having a cylindrical surface in sliding contact with the rib at the second locking position, and the slope is formed on at least one of the seating surface of the hinge pin and the boss facing each other. The door opening / closing mechanism according to any one of claims 3 to 5, wherein the door opening / closing mechanism is provided in a predetermined angle range centering on the hinge pin at the first locking position.   The door opening / closing mechanism according to claim 6, further comprising a hinge pin urging portion that urges the hinge pin in a direction in which the hinge pin is arranged at the first locking position.   A refrigerator comprising the door opening / closing mechanism according to any one of claims 1 to 7 and a door pivotally supported by a main body housing by the door opening / closing mechanism.

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