JPH03295991A - Door opening and closing mechanism - Google Patents

Abstract

PURPOSE:To automatically open and close a door through simple operation by operating a switching means to engage a clutching mechanism for making the driving force of a motor open and close the door, and disengaging the clutching mechanism for making the manually opening and closing of the door possible when the switching means is not operated. CONSTITUTION:When a switching means is operated as a door is closed, an electric current is applied to a solenoid coil 45 to engage clutching mechanism for transmitting the rotation of a rotor 6 to an output side. The rotor 6 then rotates to rotate an output pinion 40 for transmitting the above rotary motion to a fixed frame 56, and an internal gear 4 is thereby rotatively driven to re lease a latch. When a stopper 17 makes the internal gear 4 impossible in its rotation, namely makes it function as a fixing element, a motor main body is rotated round a shaft 15 to open the door 3. A sensor detects the opening of the door 3 to shut off an electric current. Thus, the door can be opened and closed by only a simple operation, namely pushing the switching means.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a door opening/closing mechanism suitable for use in various doors, particularly doors of refrigerators, showcases, and the like.

[Prior art]

General various eggs, especially doors such as refrigerators and showcases,
The door can be opened and closed by the user grasping the handle provided on the door, pulling it, and re-sliding it to take in and out tableware, food, and drinks.

[Problem to be solved by the invention]

When putting food and drinks in and out of conventional refrigerators and showcases, it is necessary to manually open and close the door as described above, so if you have dishes or drinks in both hands, do this. It is necessary to open and close the door after placing it in a different location, which is inconvenient and inefficient.
There has been a problem in that the cooling efficiency of refrigerators, in particular, is significantly reduced because the door is left open for a long time. Furthermore, a latch mechanism using a mechanical or a magnet is usually incorporated into the door, and especially in refrigerators, a latch mechanism using a strong magnet is used to improve confidentiality. Figure 5 shows the change in the amount of operating force when opening the door.The opening of the door requires a large amount of operating force on the α curve and a mechanical force such as the door hinge. Therefore, a large amount of operating force is required to open and release the latch mechanism, and it is especially difficult for relatively weak people such as the elderly, children, and women to open this door. Problems occurred when attempting to do so.

The present invention has been made in order to solve the problems of the prior art. For example, the door can be opened or closed automatically by a simple operation such as pressing a switch provided on an operation panel or the like. This allows you to easily open or close the door even if your hands are occupied, and
It is an object of the present invention to provide a door opening/closing mechanism that allows the door to be opened and closed manually even during a power outage.

Another objective is to use the motor as a drive source to open and close the door with a simple switch operation, and by considering the mounting position of the motor, the motor can be used as a drive source without reducing the internal volume or increasing the external dimensions. It can be installed.

[Means to solve the problem]

The present invention provides a motor as a drive source, a latch release mechanism that is linked to the motor and opens a door latch mechanism, and an opening/closing operation mechanism that opens or closes the door, the motor, the latch opening mechanism, and the opening/closing mechanism. A clutch mechanism that is interposed between the operating mechanism and switches the linkage between them between a connected state and a disconnected state, and a switch means that switches the clutch mechanism to the connected state and simultaneously starts the motor. It is characterized by

Moreover, the motor is housed and fixed in a door that is supported on the machine frame so as to be openable and closable, and the motor is connected to the opening/closing central axis of the door.

[Effect]

In the door opening/closing mechanism having the above configuration, when the switch means provided on the panel or the like is operated, the clutch mechanism is engaged and the output of the motor is transmitted to the latch opening mechanism and the opening/closing mechanism via the deceleration mechanism. The driving force of this motor causes the door to open or close. When the switch means is not operated or during a power outage, the clutch mechanism is disengaged and the power transmission system from the motor to the latch release mechanism and the opening/closing mechanism is cut off, allowing the door to be opened and closed manually.

Furthermore, when the motor is energized by operating the switch means, the motor body side rotates with respect to the center of rotation of the door to open or close the door, and because the motor is disposed inside the door, , without causing a decrease in internal volume or an increase in external dimensions.

〔Example〕

Embodiments of the door opening/closing mechanism according to the present invention will be described below with reference to the drawings.

FIG. 1 shows an example in which the door opening/closing mechanism according to the present invention is applied to a refrigerator. In FIG. 1, the refrigerator main body I is divided into two upper and lower storage chambers, and the lower storage chamber 1a is divided by perforated plates 10 at appropriate intervals. On the front side of each of these storage rooms, there are two hinged doors. A hinged door 3 is provided. The doors 2, 3 are provided with handles 11, 12 for manual operation, and
A switch means 13 for automatic operation is provided on the front panel of each.

As shown in FIG. 2, the doors 2 and 3 are sandwiched between a flange 14 fixed to the upper side of the refrigerator main body l and a lower flange (not shown) at one side of the upper surface of the door and one side of the lower surface of the door (not shown). It is held so as to be openable and closable with this negative side as the center of rotation. Further, a magnet 61 is provided inside the other side of the doors 2 and 3, and an iron piece 62 is provided on the refrigerator main body l facing the magnet 61, thereby forming a latch mechanism. Note that since the doors 2 and 3 and their opening/closing mechanisms have similar configurations, an example will be described below using the door 3 as an example.

In FIG. 2, a shaft 15 is non-rotatably fixed to the flange 14, and an internal gear 4 is rotatably supported on the shaft 15. This shaft 15 is connected to a rotor of a motor to be described later, and a relative rotational movement is performed between this shaft 15 and the motor. Further, near the tip of the other side of the upper surface of the door 3, an L-shaped door opening lever 5 is rotatably supported around a shaft 5C planted on the upper surface of the door 3. A wire 16 is stretched between the protruding arm portion 4a of the internal gear 4, which serves as the driving member of the lever 5, and the one side arm portion 5a of the lever 5. Stoppers 17 and 18 for determining the rotation range of the internal gear 4 are installed on the upper surface of the door 3 at a predetermined interval. Further, a spring 20 is stretched between the other side arm 5b of the lever 5 and a pin 19 implanted in the door 3, and the lever 5 is placed in a predetermined non-operating position by the tension of the spring 20. has been done. Here,
When the internal gear 4 is rotated by the motor actuator shown in FIG. 3 from the position indicated by the two-dot chain line in FIG. In order to press l, the latch mechanism of the door 3 is opened.

Note that there is a backing 21 on the inside of the door 3 to maintain airtightness.
is fixed.

FIG. 3 shows an example of a motor actuator used in the door opening/closing device. In FIG. 3, a case 22 and a cover 23 covering the case 22 form a housing of the actuator.

Note that the cover 23 is fastened to the case 22 by tapping screws (not shown) or the like. Further, a motor case 24 is fixed to the bottom of this case 22.

This motor case 24 has a comb-shaped magnetic pole 24a cut and raised concentrically, and this magnetic pole 24a is different from a magnetic pole 34a that is comb-shaped and concentrically cut and raised from a base plate 34, which will be described later. , are arranged in parallel so that each magnetic pole is interposed between two magnetic poles on the other side. A coil bobbin 25 is fitted and housed in the motor case 24 so as to surround these magnetic poles 24a, 34a. Note that a motor winding 26 is wound around this coil bobbin 25. Further, the rotor 6 is arranged on the inner peripheral side of the coil bobbin 25 and facing the magnetic poles 24a and 34a. The rotor 6 includes a motor shaft 27 and a rotor magnet 30 fixed to the motor shaft 27 via a bush 28 and a holder 29. Thus, the rotor 6, the motor windings 26. A motor having a case 24 as a stator, a ground plate 34, etc. constitutes a well-known single-phase synchronous motor, and by supplying a single-phase alternating current to a single-phase winding 26,
The comb-like pole teeth 24a, 34a, which are integrally formed on the case 24 and the ground plate 34 that surround the rotor magnet 30 and act as a stator, are alternately magnetized to N and S poles, creating an alternating magnetic field. is generated, and the rotor 6 rotates relative to the motor body side such as the stator in synchronization with this alternating magnetic field.

Further, a spring 31 is provided between the rotor 6 and the motor case 24.
is interposed, and this spring 31 urges the rotor 6 in the thrust direction. Further, the rotor 6 is integrally formed with an engaging protrusion 32 projecting in the radial direction, and a gear 33 is also integrally formed therewith.

The case 22 includes a base plate 3 that also serves as the stator of the motor.
4 is fixed, and above the case 22, the case 2 is fixed.
2, an intermediate plate 35 is arranged at a constant interval. A shaft 36 is supported between the base plate 34 and the intermediate plate 35 near the gear 33 of the motor, and further shafts 37, 38, 39 and an output pinion 40 are supported. The output pinion 40 is itself rotatable. These shafts are arranged to draw circular arcs, but are shown in an expanded form in FIG. A gear 42 is fitted onto the shaft 36 above the gear 7 via a repulsion spring 41 so as to be rotatable and slidable along the shaft 36. An engagement protrusion 42a that can engage with the engagement hole 7a of the gear 7 is formed, but normally the engagement protrusion 42a is separated from the engagement hole 7a due to the elasticity of the spring 41.Gear 42 An operating piece 43 that is slidable along the shaft 36 and along a suitable guide hole 35a formed in the intermediate plate 35 is mounted on the upper end.The operating piece 43 has a circular shape for pressing the gear 42. It consists of a plate-shaped lower part 43a and a plurality of transmission parts 43b passing through guide holes 35a formed in the intermediate plate 35.A plunger 44 is further provided at the upper end of the actuating piece 43.
is listed. The plunger 44 has a solenoid winding 45
The bobbin 46 can be slid up and down using the center hole of the bobbin 46 as a guide. The bobbin 46 has two iron cores 47.
Both upper and lower ends are magnetically connected by 48. When the winding 45 is energized, the plunger 44 is attracted downward,
The gear 42 is pushed downward through the actuation piece 43 against the biasing force of the gear 41, and its engagement protrusion 42a engages with the engagement hole 7a of the gear 7, so that the gear 42 is integrated with the gear 7. Rotationally driven. These windings 45. Iron cores 47 and 48. Plunger 44. The gears 7 and 421, the operating piece 43, and the spring 41 constitute a clutch mechanism that transmits and disconnects rotation between the motor and the reduction gear train.

The gear 42 is a large diameter gear 4 rotatably provided on the shaft 37.
A small diameter gear 49a, which is always in mesh with the gear 9 and formed integrally with the gear 49, is a large diameter gear 5 rotatably provided on the shaft 38.
A small diameter gear 5 that meshes with the gear 50 and is integrally formed with the gear 50
0a is a large diameter gear 51a rotatably provided on the shaft 39
A small diameter gear 5 that meshes with the gear 51a and is formed integrally with the gear 51a.
1a meshes with a gear 52 that is loosely fitted to the output pinion 40. These gear trains 33-7-42-49-4
9a-50-50a-51a-51-52 constitute a reduction gear train for transmitting the rotational force of the rotor 6 to the output pinion 40.

A washer 53 and a spring washer 54 are fitted into the output pinion 40 so as to sandwich the gear 52 therebetween. The inner diameter of each washer 53, 54 is the pinion 4
It is fixed to the shaft part of 0. Spring washer 5
The outer diameter portion of 4 is in pressure contact with the gear 52, and the gear 52 is in pressure contact with the washer 53. Each washer 53 , 54 for the gear 52 constitutes a friction transmission mechanism, and when the gear 52 is rotationally driven, the frictional force between the gear 52 and each washer 53 , 54 transfers the rotational force to the output pinion 40 .
The output pinion 40 is rotationally driven. However, when an abnormal load is applied to the output pinion 40, the gear 52 idles relative to the output pinion 40, and the rotational force of the motor is not transmitted to the output pinion 40, and the rotational force of the output pinion 40 is transmitted to the motor. Not at all. This output pinion 40 projects above the intermediate plate 35 and further into a hole 23a formed in the cover 23.

This hole 23a rotatably supports the outer periphery of the internal gear 4. The output pinion 40 is a sun gear, and the planetary gears 55 and the internal teeth 4b of the internal gear 4 constitute a planetary gear mechanism.

The planetary gear 55 is supported on a shaft 56a fixed to a fixed frame 56, and the frame 56 is fixed to the shaft 15.

By the way, the torque required to open the door 3 of the refrigerator is defined as TI, which is the required torque when the lever 5 is provided on the shaft 15, which is the hinge part of the door 3, and the torque required to open the door 3 near the tip of the door 3 as in this example. When the lever 5 is installed in the lever 5, the necessary rotational torque of the lever 5 is T2, and the length of the other arm 5b of the lever 5 (from the shaft 5C to the tip of the pressing part 5b of the lever 5) is defined as T2. If the length) is Ll, and the length from the shaft 15 to the tip of the pressing portion 5b of the lever 5 is L2, then T2=TI/(L2/Ll), and it is possible to open with a small amount of torque. However, the opening amount only releases the latch mechanism;
It is not used for opening the door 3.

Additionally, in order to release the latch mechanism only by relative rotation at the hinge, a large drive source with high torque is required, which increases the size and cost of the device.
As described above, if the latch mechanism is released using the lever 5 provided on the free end side of the door, it becomes possible to use a small drive source.

The deceleration transmission mechanism in the first invention is the reduction gear train described above, and the latch release mechanism is the planetary gear mechanism, the lever 5, and the wire 16. Consists of 15.

Moreover, the transmission mechanism in the second aspect of the invention is constituted by the reduction gear train and the planetary gear mechanism.

The winding 26 of the motor is supplied with single-phase AC power introduced from the outside, while the solenoid winding 45 is supplied with the single-phase AC power by rectifying the single-phase AC power with a diode or the like and then smoothing it with an appropriate capacitor. The resulting DC power is supplied. Further, this single-phase AC power and DC power are supplied by operating the switch means 13. The switch means 13 may be operated by selecting a switch for opening or closing the door, thereby determining the direction of rotation of the motor, or when the switch means for opening and closing is operated, the door is closed. The direction of rotation of the motor may be determined by detecting whether it is open or closed using a limit switch or the like. Note that a method of controlling the rotational direction of a single-phase synchronous motor is already known, that is, when the rotor attempts to rotate in a direction opposite to a predetermined direction, a one-way rotation control method that is provided so as to be able to frictionally engage with the gear 7 is activated. The rotation restriction lever 59 frictionally rotates integrally with the gear 7 and advances onto the rotation path of the engagement protrusion 32 formed integrally with the rotor 6, and engages the one-way rotation restriction lever 59 and the engagement protrusion. The portions 32 abut. Due to the reaction, the rotor 6
starts to start in a predetermined direction, and the rotational direction of the rotor is instantly switched. In addition, when the above-mentioned motor is used to perform both the opening and closing operations of the door, one side of the rotor is It is possible to use a lever whose rotation can be arbitrarily defined, and to move this lever in conjunction with the above-mentioned switch means or in conjunction with the opening/closing operation of the door. That is, for example, the rotation direction regulating lever is provided inside the door 3 so that when the switch means provided on the front panel of the door 3 is pressed to "open", the motor rotates in the opening direction of the door 3. When moved by a lever or the like and pressed to "close", the rotation direction regulating lever is moved so that the motor rotates in the closing direction of the door 3.

Next, the operation of the embodiment described so far will be explained.

The door opening/closing mechanism according to the present invention can be appropriately selected from three configurations: (1) one that can operate automatically for both opening and closing, (2) one that can operate automatically only for opening, and (2) one that can automatically operate only for closing. However, here, we will explain the case where configuration (3) is adopted.

Now, if the user operates the switch means while the door is closed, the plunger 44 is attracted to the iron cores 47 and 48 by energizing the threaded winding 45, resisting the biasing force of the spring 41. The gear 42 is connected to the actuating piece 43.
is moved downward through. As a result, the engaging portion 42a of the gear 42 and the engaging hole 7a of the gear 7 are engaged, that is, the clutch mechanism is engaged, and the rotation of the rotor 6 can be transmitted to the output side.

On the other hand, single-phase AC power is supplied to the winding 26 of the motor, and the rotor 6 is rotationally driven. At this time, the rotational direction of the rotor 6 is indefinite, and if it tries to rotate in the opposite direction to the predetermined direction, for example, the one-way rotation restriction lever 59
collides with the engagement protrusion 32 of the rotor 6, and the rotor 6 is reversed to the normal direction due to the reaction, and thereafter continues to rotate in the normal direction. The rotational force of the rotor 6 is transmitted from the gear 33 formed on the rotor 6 to the gear train 7-42-49a-50-50a-51.
a-51-52 to the output pinion 40.

Normally, the rotation of the output pinion 40 is transmitted to the internal gear 4 and the fixed frame 56 via a planetary gear 55 of a planetary gear mechanism in which the output pinion 40 is a sun gear.

In this embodiment, since the fixed frame 56 directly connected to the hinge part of the door 3 via the shaft 15 is a fixed element, the internal gear 4 is rotationally driven and the wire 16 shown in FIG. The lever 5 is rotationally driven to release the latch of the latch mechanism consisting of a magnet 61 and an iron piece 62 as shown in FIG.

Thereafter, when the internal gear 4 becomes unrotatable at the stopper 17, the internal gear 4 becomes a fixed element, and therefore the shaft 15 is rotated, but the tip of the shaft 15 is engaged with and fixed to the flange 14. Therefore, as a reaction force, the motor body side rotates around the central axis of the shaft 15, which is the center of opening and closing of the door. This is because the shaft 15, which is a fixed element, and the rotor 6 are connected, and the rotor 6 becomes a fixed element, so that the motor body side, such as the stator, rotates with respect to the rotor 6 in synchronization with the alternating magnetic field. Therefore, the door 3 to which this motor is installed and fixed
The door 3 also rotates about the shaft 15 as the center of opening and closing, and the door 3 becomes open.

The energization of the motor winding 26 and the solenoid winding 44 is controlled by a timer or a sensor such as a limit switch detects that the door has opened to a predetermined position, and is cut off at this point. Then, the clutch mechanism is disengaged, the motor is also stopped, and the door opening operation is completed.

Next, when the door is open, the switch means 13
When operated, the clutch mechanism engages as described above and the rotor 6 of the motor begins to rotate. In this case as well, the rotational direction of the rotor 6 is indefinite, but the rotation is controlled by the above-mentioned rotational direction control means in a predetermined direction, that is, in a direction opposite to that when the door is opened. The rotational force of the rotor 6 drives the output pinion 40 via the above-mentioned reduction gear train, so that the internal gear 4 rotates in the opposite direction to when it is opened, and the wire 1
6 is loosened, and the lever 5 is returned to a predetermined position by the spring 20.

When the internal gear 4 becomes unable to rotate at the stopper 18, the internal gear 4 becomes a fixed element and attempts to rotate the shaft I5, but the tip of the shaft 15 is engaged and fixed to the flange I4, and as a reaction force When the motor body and the door rotate about the central axis of the shaft 15 and the door 3 approaches the main body side machine frame, the magnet 61 of the latch mechanism
The door 3 is attracted to the machine frame on the main body side by the suction action between the iron piece 62 and the iron piece 62, and the door is closed. In this case as well, motor winding 2
6 and the solenoid winding 44 are controlled by a timer, sensor, etc., and the door closing operation is completed.

When the switch means 13 is not operated, the clutch mechanism is in a disengaged state, and the reduction mechanism from the gear 42 to the output pinion 40 can rotate freely. Therefore, when the door is manually opened and closed, the output pinion 40 and the reduction mechanism are rotationally driven through the shaft 15, but since this reduction mechanism can be rotated freely as described above, the door cannot be opened or closed manually. can be done easily.

Therefore, even if automatic opening/closing using a motor is not possible due to a power outage, it is possible to open/close the door manually.Also, even if automatic opening/closing of the door is not required, the door can be opened/closed manually. be able to.

Furthermore, even if an abnormal external force is applied to the output pinion 40, the friction transmission mechanism consisting of the gear 52, washer 53, and spring washer 54 provided on the output pinion 40 will appropriately slip, and the abnormal external force will cause the actuator to It is not transmitted to the internal mechanism and the internal mechanism of the actuator is protected.

In the case where an abnormal external force is applied to the output pinion 40,
While the motor is running, the door may hit a child or other person in front, or the door may hit another obstacle. In such a case, the friction transmission mechanism functions,
Not only the internal mechanism of the actuator, but also children and obstacles will be protected.

Furthermore, when a DC motor is used as the motor, an abnormal load current will flow through the motor when an abnormal external force is applied and the friction transmission mechanism is functioning. The power supply may be cut off.

In this way, the protection effect for the motor, internal mechanism, children, etc. can be further strengthened. Further, the load current detection means described above can be used as a door opening/closing operation completion detection means and can be replaced with a limit switch.

In the configuration described above, only the opening or closing of the door may be performed automatically, and the opening and closing may be performed manually. In this case, the motor only needs to rotate in one direction, and no rotation direction switching means is required.

In addition to the single-phase AC synchronous motor, it is also possible to use a DC motor as described above for the motor used in the present invention. In the latter case, if it is necessary to switch the rotation direction, it is possible to so that it can be switched. Further, the clutch mechanism is not limited to an electromagnetic type using a solenoid, but a centrifugal clutch may be used that utilizes centrifugal force exerted by rotational driving force, and the clutch form may also be a planetary clutch.

Moreover, the speed reduction mechanism may be a planetary gear mechanism or a worm mechanism instead of the spur gear.

Further, FIGS. 6 to 1O show other embodiments of the door opening/closing mechanism according to the present invention, which opens and closes the door by releasing a latch using an intermittent feeding mechanism.

According to this, in FIG. 6, a shaft 57 is non-rotatably fixed to the flange 14 fixed to the upper side of the refrigerator main body, and a fixed gear 58 is non-rotatably engaged with the shaft 57. The door 3 is rotatable about the shaft 57, and the door 3 has, for example, built-in the motor actuator shown in FIG. The door 3 can also be opened and closed manually. Furthermore, an intermittent gear 8 is fixed to the output shaft of the motor actuator instead of the pinion 40.

This intermittent gear 8 has teeth 8a formed in a predetermined region thereof, and a cam 8b integrally formed therein. cam 8
One side arm 9a of an L-shaped lever 9 is arranged so as to be in contact with the protrusion 8C of b to be swung. As shown in FIG. 7, the lever 9 is rotatably supported on a shaft 59 installed on the upper side of the door 3. On the other side of the upper surface of the door 3, an L-shaped lever 5 is rotatably supported on a shaft 60 planted on the upper side of the door 3. A wire 16 is stretched between the other arm 9b of the lever 9 and the one arm 5a of the lever 5. Further, a spring 20 is stretched between one arm 5a of the lever 5 and a pin 19 implanted in the door 3, and the one arm 9a of the lever 9 is urged into contact with the cam 8b. . A magnet 61 is provided inside the other side of the door 3, and an iron piece 62 is provided on the refrigerator main body l facing the magnet 61 to constitute a latch mechanism.

In this other embodiment, the latch release mechanism of the first invention includes the cam 8 rotatably driven by a motor actuator.
b, lever 9, wire 16, and lever 5, and the opening/closing operation mechanism is composed of the intermittent gear 8.b. Fixed gear 5
8 and a shaft 57. Further, the transmission mechanism of the second invention is constituted by the reduction gear train and the intermittent gear 8 of the motor actuator.

Here, when the switch means 13 (not shown) is operated to "open", the intermittent gear 8 is rotationally driven from the position shown in FIG. 7 to the position shown in FIG. lever 9 and lever 5 by part 8C
is rotated, and the other side arm 5b of the lever 5 moves the refrigerator main body 1.
Press to release the latch mechanism and the door 3 will be opened.

When the intermittent gear 8 is further rotated, the teeth 8a begin to mesh with the fixed gear 58. Since the fixed gear 58 is non-rotatably engaged with the flange 14 via the shaft 57, the intermittent gear 8 performs planetary motion relative to the fixed gear 58 as a reaction force. That is, the motor actuator side rotates around the central axis of the shaft 57, and therefore the door 3 performs the opening operations shown in FIGS. The motor stops after opening the angle.

On the other hand, from the state shown in FIG. 1θ, the switch means 13
When the motor is operated to "close", the motor starts rotating in the opposite direction to the opening direction of the door 3, and the teeth 8 of the intermittent gear 8 start rotating.
a and the fixed gear 58 mesh again, the intermittent gear 8 rotates in a planetary motion relative to the fixed gear 58, and the door 3 rotates in the closing direction to the state shown in FIG. 8. When the lever 5 further rotates clockwise from the state shown in FIG. 8, the door 3 is attracted to the machine frame on the main body side by the suction action of the magnet 61 and the iron piece 62 of the latch mechanism, and the door 3 is closed. .

Note that the fixed gear 58 and the intermittent gear 8 may each be a cam. That is, the outer circumferential portions of each are brought into sliding contact, and in a predetermined region, a convex portion (protruding from the outer circumferential portion) provided on one side and a recessed portion (concave from the outer circumferential portion) provided on the other side engage, and the predetermined region In this case, both may be configured to rotate together.

It goes without saying that the door opening/closing mechanism described above is similarly provided on the door 2 side.

Furthermore, the door opening/closing mechanism of the present invention may be implemented as a door opening/closing mechanism of a microwave oven, a system kitchen, a mechanical clock, etc., in addition to a refrigerator.

〔Effect of the invention〕

According to the present invention, the door can be opened or closed simply by operating the switch means, so even if the door is held in both hands in the kitchen, etc., the switch can be operated. You can easily open or close the door with just a single touch, which is extremely convenient and improves work efficiency. Particularly in refrigerators, the time required to take food and drinks in and out can be shortened, thereby improving cooling efficiency and reducing power consumption. Further, since the door can be opened or closed automatically, even people with weak strength such as women and children can open or close the door without any problem. Furthermore, since a clutch mechanism is provided that disengages when the switch means is not operated, manual opening and closing is also possible.

Furthermore, since the motor is disposed and housed in the door and the motor is linked to the opening/closing shaft of the door, the main body of the motor rotates with respect to the center of rotation of the door by operating the switch means to open or close the door. , and the motor can be attached without reducing the internal volume or increasing the external dimensions.

[Brief Description of the Drawings] Figures 1 to 10 show embodiments of the door opening/closing mechanism according to the present invention, and Figure 1 is a perspective view of a refrigerator in which the door opening/closing mechanism of this invention is implemented, and Figure 2 is a 3 is a developed sectional view showing an example of an actuator that can be used in the present invention, FIG. 4 is a schematic diagram of the door, and FIG. 5 is a diagram showing the time course of the required force when opening the door, 6 to 1O show other embodiments of the door opening/closing mechanism according to the present invention, with FIG. 6 being a detailed perspective view of the same, and FIGS. 7 and subsequent figures being explanatory views of the same operation. 2.3...door, 13...switch means, 6.24.
25゜26, 27.28.29.30.34... Parts constituting the motor, 7, 41, 42.43.44, 4
5.46.47.48...Parts constituting the clutch mechanism, 49.49a, 50.50a, 51.51a. 52... Parts forming a gear train, 61.62... Parts forming a latch mechanism.

Claims (2)

[Claims] (1) A switch means for opening or closing a door provided in the machine frame so that it can be opened and closed; a motor that is energized and driven by operation of the switch means; and a motor that transmits the rotational output of the motor at a reduced speed. a deceleration transmission mechanism, a clutch mechanism provided in the deceleration transmission mechanism or continuously with the deceleration transmission mechanism and capable of connecting and disconnecting transmission of motor output, and connected to the motor via the deceleration mechanism and the clutch mechanism; a latch release mechanism that opens the latch mechanism of the door when the switch means is operated; and an opening/closing operation mechanism that opens the door or closes the door after releasing the latch mechanism, and when the switch means is operated, the clutch When the mechanism is engaged, the door is opened or closed by the driving force of the motor, and when the switch means is not operated, the clutch mechanism is in a disengaged state and the door can be opened and closed manually. Features a door opening/closing device. (2) A switch means for opening or closing a door provided in the machine frame so as to be openable and closable; a motor that is energized and driven by operation of the switch means; and a central shaft between the motor and the opening/closing axis of the door. and an interlocking transmission mechanism, the motor is housed in the door, and the door is opened or closed by rotating the motor with respect to the opening/closing central axis of the door by operating the switch means. Door opening/closing device.