JP4455477B2 - dishwasher - Google Patents

Description

  The present invention relates to a dishwasher provided with an upper door and a lower door that open and close a loading / unloading port of a washing tank, and a link mechanism that opens and closes the upper door by opening and closing the lower door.

  Conventionally, in this type of dishwasher, a first rotating support shaft that rotatably supports the lower door in the washing tank, and a second rotating support that rotatably supports the upper door in the washing tank. A rod, a lower connecting rod rotatably connected to the lower door at one end thereof, an upper connecting rod rotatably connected to the upper door at one end thereof, and a lower connecting rod and an upper connecting rod The above-mentioned link mechanism having a connecting rotation support shaft that is rotatably connected at the other end side of this is often used.

  In general, the upper and lower doors and the cleaning tank are configured using a resin base, and it is difficult to directly support the rotating support shaft. For this reason, the upper and lower connecting rods are connected to door support arms fixed to the upper and lower doors, respectively. In addition, the first rotating support shaft that supports not only the lower door but also the load of the upper door is received by a support substrate attached to the cleaning tank side.

  Among them, there is a dishwasher in which the washing tub is provided with a link guide groove that guides the connecting rotation support shaft along the locus. A roller is provided on the outer periphery of the connection rotation support shaft, and the connection rotation support shaft moves smoothly in the link guide groove. In the link guide groove, a bending guide portion is provided by setting so that only the lower door rotates for a while from the beginning of opening. The upper door is set to rotate to the open position by moving the connecting rotation support shaft from the bending guide portion with the main displacement direction as the forward direction (see Patent Document 1).

Japanese Patent Laying-Open No. 2005-245642 (see FIGS. 3 to 5, paragraph numbers [0035] and [0039])

  However, in the dishwasher of Patent Document 1 described above, since the upper door is opened by moving the connection rotation support shaft from the bending guide portion with the main displacement direction as the front direction, the connection rotation is performed by the rotation of the lower door. The moving support shaft is pushed upward. For this reason, there existed a problem that rotation of a lower door became heavy after a connection rotation support shaft passed a bending guide part.

  Furthermore, in the door opening / closing mechanism disclosed in Patent Document 1, there is a time in which the lower door support arm, the lower connecting rod, and the support substrate overlap in the axial direction when the door is opened and closed. For this reason, it is necessary to provide a link working space enabling the above-described overlap between the cleaning tank and the outer case in the axial direction, and there is a limit to reducing the width dimension of the outer case.

  Accordingly, a first problem of the present invention is that when the upper and lower doors for opening and closing the cleaning tank are opened by opening and closing the lower door, the lower door is easily rotated not only at the beginning of opening but also until the upper and lower doors have been opened. There is. A second object of the present invention is to further narrow the link operating space of the link mechanism in the axial direction.

  In order to solve the first problem, the present invention provides a dishwasher comprising: an upper door and a lower door that open and close a loading / unloading port of a washing tank; and a link mechanism that opens and closes the upper door by opening and closing the lower door. The link mechanism includes a first rotation support shaft that rotatably supports the lower door in the cleaning tank, and a second rotation that rotatably supports the upper door in the cleaning tank. A support shaft, a lower connecting rod that is rotatably connected to the lower door at one end thereof, an upper connecting rod that is rotatably connected to the upper door at one end thereof, and the lower connecting rod and the upper connecting A link rotation groove for connecting the rod to the other end of both rods so as to be rotatable, and a link guide groove for guiding the connection rotation pivot along the locus in the cleaning tank. Installed, bent at the link guide groove by setting the lower door rotation speed to start faster than the upper door The provided, said connecting pivot support shaft and configured to move the main displacement direction after reaching the bent portion as a front direction.

  According to the above configuration, since the rotation speed of the lower door becomes faster than that of the upper door until the connection rotation support shaft reaches the bent portion, the load applied to the connection rotation support shaft is small and the lower door is light. Rotate. In addition, since the main rotation direction moves forward after the connection rotation support shaft reaches the bent portion, most of the load of the upper door applied to the connection rotation support shaft is received by the link guide groove. It is done. Accordingly, the lower door can be easily rotated not only at the start of opening but also until the upper and lower doors have been opened.

  In the above configuration, when the lower door rotation speed at the beginning of opening is set to be faster than that of the upper door, the upper door is appropriately set so that the upper door is stationary or rotated while the connecting rotation supporting shaft moves through the bent portion. Can be selected.

  In the above configuration, the lower door is provided so as to rotate by itself when the door lock is released, and the connection rotation support shaft is regulated by the wall surface of the bent portion, thereby adopting a configuration in which the lower door is temporarily stopped. can do. In other words, by providing the lower door so that it can rotate to the opening side itself when the door lock is released, it is not necessary for the user to rotate the lower door at the beginning of opening, thereby bending the connecting rotation support shaft. It is possible to temporarily stop the connecting and rotating support shaft by preventing the portion from being passed at once and restricting the connecting and rotating support shaft by the wall surface of the bent portion. Therefore, the lower door is always temporarily stopped at the time of the door opening operation, and the upper and lower doors are opened through the subsequent turning operation of the lower door by the user. As a result, when the door opening operation is mistakenly performed during the cleaning operation, the user can check the state of the cleaning tank without opening the upper and lower doors. As a result, a large amount of cleaning water leaks. Can be prevented.

  In order to solve the second problem, according to the present invention, in the above structure, the lower connecting rod is connected to a lower door support arm fixed to the lower door, and the first rotating support shaft is cleaned. A structure is adopted in which the lower connecting rod is connected to the upper end side of the lower door with respect to the first rotation support shaft and is passed above the support substrate while being received by a support substrate attached to the tank. . According to this configuration, the lower connecting rod and the support substrate do not overlap in the axial direction when the door is opened and closed, and accordingly, the link operation space can be narrowed in the axial direction.

  In the above configuration, the pulling spring that urges the connecting rotation support shaft to the bent portion side from the start end of the link guide groove where the lower door is in the closed position between the lower connecting rod and the cleaning tank side. When the lower door opens, when the lower door is opened, the pull spring is fixed to the cleaning tank side at the rear side of the end of the link guide groove where the lower door is in the open position. However, when the lower pivot is stopped at the open position, the pulling spring moves the rear of the coupling pivot on the rear side. It becomes a damper that pulls in and relaxes the movement. On the contrary, when the lower door is closed, the pulling spring pulls the connecting rotation support shaft backward to assist the movement to the bent portion, and when the lower door stops at the closed position, the pulling spring bends the connecting rotation support shaft. Acts as a damper that pulls to the side. That is, with one pulling spring, it is possible to realize movement assistance of the connecting rotation support shaft at the bent portion and a damper at the end of movement.

As described above, according to the present invention, the cleaning tank is provided with a link guide groove for guiding the connection rotation support shaft along the locus, and the lower door rotation speed at the start of opening is higher than that of the upper door. By adopting a configuration in which a bending portion is provided in the link guide groove so as to be faster, and the connecting rotation support shaft moves with the main displacement direction as the forward direction after reaching the bending portion, When the upper and lower doors to be opened and closed are opened by opening and closing the lower door, the lower door can be easily rotated not only at the beginning of opening but also until the upper and lower doors have been opened.
Further, according to the present invention, the lower connecting rod is connected to a lower door support arm fixed to the lower door, the first rotating support shaft is received by a support substrate attached to the cleaning tank, and the lower connecting rod is received. By adopting a configuration in which the first rotating support shaft is connected to the upper end side of the lower door, the link operating space of the link mechanism can be narrowed in the axial direction.

An embodiment of the present invention will be described below with reference to the accompanying drawings.
As shown in FIG. 1, the dishwasher according to this embodiment is configured such that tableware baskets 21 and 22 are installed in the washing tank 10, and according to the operation content set by the switch operation, Washing water is sprayed from the respective washing nozzles into the tank, and the circulating washing process of sucking the washing water from the water reservoir provided at the bottom of the washing tank 10 and spraying it again and the draining process of draining the washing water are repeated. In this way, the dishwashing is carried out, and when the dishwashing is finished, the drainage process is finally carried out.

  The washing tub 10 has a structure in which a loading / unloading opening for the tableware baskets 21 and 22 is formed on the front side of a resin base having a substantially rectangular parallelepiped shape as a whole, and is stored in the outer case 30 with a gap in the width direction. ing.

  The cleaning tank 10 is provided with an upper door 11 and a lower door 12 that open and close its entrance / exit, and a link mechanism that opens and closes the upper door 11 by opening and closing the lower door 12. The lower door 12 is provided so as to open when the lower door 12 is pulled down and rotated, and to close with a reverse motion. The upper door 11 is opened and closed by receiving the opening / closing operation force of the lower door 12 through a link mechanism. Hereinafter, this link mechanism will be described.

  A support substrate 41 a along the outer surface is attached to the lower side of the front end of the side wall of the cleaning tank 10. The front end portion of the support substrate 41a serves as a receiving portion for the first rotation support shaft 41 that rotatably supports the lower door 12. The first pivot support shaft 41 is passed through the lower door lower end side of the lower door support arm 41b fixed to the side end portion of the lower door 12.

  Further, a support substrate 42 a along the outer surface is attached to the upper side of the front end of the side wall of the cleaning tank 10. The upper end portion of the support substrate 42a serves as a receiving portion for the second rotation support shaft 42 that rotatably supports the upper door 11. The second pivot support shaft 42 is passed through the upper door upper end side of the upper door support arm 42b fixed to the side end portion of the upper door 11.

  The lower door support arm 41 b is provided with a first shaft support portion 43 located on the upper end side of the lower door with respect to the first rotation support 41. A lower connecting rod 44 constituting the link mechanism is connected to the first shaft support 43 so as to be rotatable at one end side thereof.

  The upper door support arm 42 b is provided with a second shaft support portion 45 located on the lower end side of the upper door with respect to the second rotation support 42. The upper connecting rod 46 constituting the link mechanism is connected to the second shaft support portion 45 so as to be rotatable at one end side thereof.

  The lower connecting rod 44 and the upper connecting rod 46 are rotatably connected by a connecting rotation support shaft 47 passed through the other end side.

  The lower connecting rod 44 is bent so as to pass above the support substrate 41a. When the lower door is opened and closed, the first shaft support portion 43, which is a connecting shaft with the lower door support arm 41b, is displaced so as to be lifted around the first rotation support shaft 41 (see FIG. 3B). The connecting rod 44 does not overlap the support substrate 41a in the axial direction. By utilizing this, as shown in FIG. 2, the lower connecting rod 44 is provided so that there is no portion located closer to the outer case 30 than the support substrate 41a. For this reason, in this embodiment, the outer case 30 is reduced by narrowing the link working space in the axial direction as compared with the configuration in which the lower connecting rod 44, the support substrate 41a, and the lower door support arm 41b overlap in the axial direction when the door is opened and closed. The width dimension can be made relatively small. In FIG. 2, the lower part of the cleaning tank 10 is drawn as a cross-sectional view of the lower door 12 cut by a vertical plane parallel to the axial direction on the upper end side of the lower door from the first pivotal support part 43. The upper side of the broken portion of the tank 10 is depicted as a cross-sectional view of the cleaning tank 10 cut by a vertical plane parallel to the axial direction on the rear side of the support substrate 41a.

  As shown in FIG. 1, a link guide groove 48 that guides the connecting rotation support shaft 47 along this locus is provided on the outer surface of the side wall of the cleaning tank 10 by integral molding. In the state where the lower door 12 is in the closed position, as shown in FIG. 3A, the connecting rotation support shaft 47 hits the start end of the link guide groove 48, and in the state where the lower door 12 is in the open position, FIG. As shown in (b), the connecting rotation support shaft 47 is adapted to contact the terminal end of the link guide groove 48.

  As shown in FIG. 1, a roller 47 a is provided on the outer periphery of the connecting rotation support shaft 47. The connecting rotation support shaft 47 moves smoothly while being guided by the link guide groove 48 on the rolling surface of the roller 47a. Moreover, the axial movement of the lower connecting rod 44 is restricted by the cleaning tank 10 and the pressing member 49 attached to the side wall. Thus, the roller 47a is prevented from being detached from the link guide groove 48.

  The rotational speed at which the lower door 12 begins to open is set to be faster than the upper door 11 as shown in FIG. That is, the radial distance r1 between the first rotation support shaft 41 and the first shaft support portion 43 is smaller than the radial distance r2 between the second rotation support shaft 42 and the second shaft support portion 45. In addition, the angular velocity of the lower door 12 around the first rotation spindle 41 is made faster than the angular velocity of the upper door 11 around the second rotation spindle 42. For this reason, at the beginning of the opening of the lower door 12, the connection rotation support shaft 47 moves mainly around the rotation of the upper connection rod 46 around the second shaft support portion 45. After being displaced downward, it is displaced obliquely upward and forward. As a result, the link guide groove 48 is provided with a bent portion 48a that guides the movement of the connecting rotation support shaft 47 at the beginning of opening. In this manner, the rotating speed of the lower door 12 is faster than that of the upper door 11 until the connecting and rotating support shaft 47 reaches the bent portion 48a. 12 turns lightly.

  As shown in FIG. 3B, the connecting rotation support shaft 47 is set to move with the main displacement direction as the front direction after reaching the bent portion 48a. That is, the link guide groove 48 has a lateral groove portion 48 b that guides the connecting rotation support shaft 47 in the front-rear direction from the bent portion 48 a to the end of the link guide groove 48. For this reason, the load of the upper door 11 is applied to the connecting rotation support shaft 47 that pushes up the upper door 11 via the upper connecting rod 46, but most of the load is received by the wall surface of the link guide groove 48. As a result, not only the opening starts but also the lower door 12 turns lightly until the upper and lower doors 11 and 12 are completely opened.

  In this embodiment, the lateral groove portion 48b is formed as a gentle continuous curved surface so as not to exceed the height of the starting end of the link guide groove 48 and lower than the lower end of the bent portion 48a. For this reason, even when the upper and lower doors 11 and 12 are closed, the lower door 12 can be easily rotated. The gradient of the lateral groove portion 48b is suppressed to 45 degrees or less over the entire area.

  Between the lower connecting rod 44 and the cleaning tank 10 side, a pulling spring 50 that biases the connecting rotation support shaft 47 from the start end of the link guide groove 48 toward the bent portion 48 a is provided below the link guide groove 48. It is erected to be located. The fixing position of the tension spring 50 on the cleaning tank 10 side is provided behind the end of the link guide groove 48. When the lower door 12 is opened, the pulling spring 50 prevents the connecting rotation support shaft 47 from being caught by the bent portion 48a to ensure the rotation of the lower door 12 to the opening side, and the lower door 12 is in the open position. When the connection rotation support shaft 47 hits the end of the link guide groove 48, the pull spring 50 pulls the connection rotation support shaft 47 rearward and becomes a damper that relaxes the movement. On the contrary, when the lower door 12 is closed, the pull spring 50 pulls the connection rotation support shaft 47 rearward to assist the movement to the bent portion 48a, and when the lower door 12 stops at the closed position, that is, the connection rotation support. When the shaft 47 hits the start end of the link guide groove 48, the pulling spring 50 acts as a damper that pulls the connecting rotation support shaft 47 toward the bent portion 48a.

  Further, in this embodiment, as shown in FIGS. 1 and 3A, the lower door 12 is provided with an operation portion 51 exposed on the front surface and a door hook 52 that engages with the cleaning tank 10 side. When the operation unit 51 is pushed while the lower door 12 is in the closed position, the door hook 52 is disengaged and the locked state of the upper door 11 and the lower door 12 is released. When the lower door 12 is in the closed position, the door hook 52 is automatically engaged with the cleaning tank 10 side.

  When the engagement of the door hook 52 is released, the lower door 12 turns to the opening side by itself. This can be realized by setting the center of gravity of the lower door 12 so as to generate a rotational moment about the first rotation support shaft 41 and the movement assisting action of the connecting rotation support shaft 47 of the tension spring 50. . For this reason, when the lower door 12 starts to open, the user does not need to rotate the lower door. Accordingly, it is possible to prevent the connecting rotation support shaft 47 from passing through the bent portion 48a at once.

  Then, as shown in FIG. 3C, when the connecting rotation support shaft 47 reaches the lowermost end portion of the bent portion 48a, the connecting rotation support shaft 47 is restricted by the wall surface and is temporarily stopped by frictional contact. The tension spring 50 assists this frictional contact. Accordingly, the lower door 12 is always temporarily stopped during the door opening operation, and the upper and lower doors 11 and 12 are opened through the subsequent turning operation of the lower door 12 by the user. Thereby, when the door opening operation is mistakenly performed during the cleaning operation, the user can check the state in the cleaning tank 10 in a state where the upper and lower doors 11 and 12 are not opened largely. Can be prevented from leaking in large quantities.

Overall perspective view of a dishwasher according to an embodiment 1 is a cross-sectional view of the lower door support arm in FIG. 1 cut along a plane parallel to the axial direction. Operational diagram showing the link mechanism from the side when the upper and lower doors of FIG. 1 are in the closed position Operational diagram showing the link mechanism from the side when the upper and lower doors of FIG. 1 move to the open position Operational diagram showing the link mechanism from the side when the upper and lower doors of FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Washing tank 11 Upper door 12 Lower door 21, 22 Tableware basket 30 Outer case 41 1st rotation support shaft 41a, 42a Support board 41b Lower door support arm 42 2nd rotation support shaft 42b Upper door support arm 43 1st 1 shaft support portion 44 lower connection rod 45 second shaft support portion 46 upper connection rod 47 connection rotation support shaft 47a roller 48 link guide groove 48a bending portion 48b lateral groove portion 49 pressing member 50 pulling spring 51 operation portion 52 door hook

Claims (4)

  An upper door and a lower door that open and close the entrance / exit of the cleaning tank, and a link mechanism that opens and closes the upper door by opening and closing the lower door, and the link mechanism rotates the lower door to the cleaning tank. A first pivot shaft that can be supported, a second pivot shaft that pivotally supports the upper door to the washing tank, and a pivotal connection to the lower door at one end thereof. A lower connecting rod, an upper connecting rod rotatably connected to the upper door at one end thereof, and a connecting turn for rotatably connecting the lower connecting rod and the upper connecting rod at the other end of both rods. A link guide groove is provided in the cleaning tank for guiding the connecting rotation support shaft along the locus so that the lower door rotation speed at the beginning of opening is faster than the upper door. The link guide groove is provided with a bent portion, and the connection rotation support shaft reaches the bent portion. Place dishwasher to move the direction as previous direction.   The dishwasher according to claim 1, wherein the lower door is provided so as to rotate to the opening side itself when the door lock is released, and the connecting rotation support shaft is temporarily stopped by regulating the wall surface of the bent portion.   The lower connecting rod is connected to a lower door support arm fixed to the lower door, the first rotating support shaft is received by a support substrate attached to the cleaning tank, and the lower connecting rod is received in the first rotation. The dishwasher according to claim 1 or 2, wherein the dishwasher is connected to the upper end side of the lower door with respect to the moving support shaft and passes above the support substrate.   A tension spring is installed between the lower connecting rod and the cleaning tank side to urge the connecting pivot shaft toward the bent portion from the starting end of the link guide groove where the lower door is in the closed position. The dishwasher according to any one of claims 1 to 3, wherein a fixing position of the pulling spring on the washing tub side is provided behind the end of the link guide groove where the lower door is in the open position.

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