JP2692308B2 - Opening / closing door device and buffer mechanism for opening / closing door device - Google Patents

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an opening / closing door device for an apparatus having a storage chamber for storing and receiving an object such as food such as an oven and a microwave oven, and a cushioning mechanism used for the apparatus.

2. Description of the Related Art In recent years, in order to improve the usability of household cookers, the one that is configured to open the door automatically by pressing the operation button and to prevent the door from opening suddenly by providing a buffer mechanism has been proposed. Proposed.

Conventionally, there is an opening / closing door device of this type as shown in FIG. In the figure, reference numeral 1 is a device main body, which is a storage chamber 2 in which food is placed and a heating source 3 for heating and cooking food.
Is provided. Reference numeral 4 denotes a latch device for holding the opening / closing door 5 closed, and an arm 7 that rotates about a pin 6 is provided. One end of this arm 7 drives the heating source 3 via a cam 8. It is connected to the latch switch 9. An operation button 10 pushes down the arm 7 to turn off the latch switch 9 and open the opening / closing door 5. Reference numeral 11 denotes a door hinge, which connects the opening / closing door 5 to the main body 1 so as to be openable / closable by a pin 12 serving as a fulcrum of the opening / closing door 5. Further, 13 is an oil damper system, that is, a cushioning member that exerts a cushioning action by utilizing the viscosity of oil, which prevents the opening / closing door 5 from being opened suddenly, and uses the pin 15 as a fulcrum to connect the opening / closing door via the link rod 14. It is connected to 5.

Next, the operation of this conventional example will be described. In the closed state of the open / close door, that is, in the state shown in FIG. 7, the arm 7 receives an upward force by the spring 16, is locked by the latch body 17, and turns on the latch switch 9 via the cam 8. When a cooking start switch (not shown) is turned on in this state, the heating source 3 is activated to start cooking. When the operation button 10 is pressed after cooking, the arm 7 is moved through the cam 8.
Is pushed down, the opening / closing door 5 is opened, and the latch switch 9 is turned off. At this time, the opening / closing door 5 moves like a link rod.
It is connected to the buffer member 13 via 14 and gradually opens.

SUMMARY OF THE INVENTION However, such a conventional structure requires a cushioning member 13 having a large cushioning capacity to gradually open the opening / closing door 5, which directly leads to an increase in cost and increases the size of the device. , Leading to an increase in weight.

That is, since the link bar 14 is required, the opening / closing door 5 and the cushioning member
The position of the link rod 14 that connects 13 is the fulcrum pin 12
Limited to the vicinity of. This is because, if it is provided at a position away from the pin 12, the stroke of the cushioning member 13 with respect to the operation of the opening / closing door 5 becomes large, which is disadvantageous, and when the opening / closing door 5 is opened, most of the link rods 14 are exposed, which is not desirable in appearance. This is also because it hinders the taking in and out of the cooked food.

As a result, as shown in FIG. 8, the moment acting on the pin 12, which is the fulcrum, is the product of the own weight W with respect to the opening / closing angle θ of the opening / closing door 5 and the distance L _s between the axis of the pin 12 and the center of gravity. The moment is the largest when the door 5 is completely open, that is, when the opening / closing angle θ is 90 °, which is the product of the own weight W and L _sm . When trying to support the moment acting on the pin 12 with the link rod 14, it is roughly shown that, if the pitch between the pin 12 and the pin 15 is P, the lever ratio L and A force corresponding to P is required.
That is, a force of L / P times the own weight W is required, and a large buffer capacity is required.

Further, in this structure, the structure is complicated because the links are connected by the link rods 14, and it is necessary to insert the pins 12 and 15 after assembling each member.

Therefore, the first object of the present invention is to obtain an opening / closing door device with a cushioning function that is easy to assemble.

A second object is to provide a compact and lightweight cushioning mechanism by using a cushioning member having a small capacity even when a large cushioning capacity is required.

Means for Solving the Problems In order to achieve the above first object, the present invention provides a door unit by providing a buffer mechanism and a hinge element on the side of an opening / closing door, and a positioning in which one end of the hinge element is inserted. A hinge fixing member having a portion is provided on the main body side,
The buffer mechanism includes a bearing member fixed to the opening / closing door, a shaft provided on the bearing member, a first torsion spring inserted in the shaft and biased in a direction of opening the opening / closing door, and A second torsion spring biased in a direction to close the opening / closing door.

In order to achieve a second object, the present invention provides a cushioning member provided in an opening / closing door, a shaft provided at a central axis of the cushioning member, a hinge element integrally provided with the shaft, and the shaft. And a second torsion spring urged in the direction to close the opening / closing door and a second torsion spring urged in the direction to close the opening / closing door. A is a change curve of the rotational torque acting on the fulcrum of the hinge element with respect to the door opening / closing angle θ, the operating characteristic of the first torsion spring is B, and the resultant curve of the curve A and the operating characteristic B is C. The operation characteristic of the second torsion spring is set within the range formed by the curve A and the resultant force curve C.

With the above-described structure, the opening / closing door device of the present invention has the hinge in which the cushioning mechanism and the hinge element are built in the opening / closing door to complete the assembly as a door unit, and one end of the hinge element protruding from the door unit is fixed to the main body side. It is possible to assemble easily and surely by inserting and fixing in the positioning portion of the fixing member. Further, by providing the first torsion spring and the second torsion spring, the door can be automatically opened by pressing the operation button for releasing the latch device.

Further, a first torsion spring biased in the direction to open the opening / closing door and a second torsion spring biased in the direction to close the opening / closing door are provided, and the operating characteristics of the second torsion spring are determined by the opening / closing door. The change curve of the rotational torque that acts on the fulcrum of the hinge element with respect to the door opening / closing angle θ caused by the own weight of the above, and the change curve and the resultant force curve of the operating characteristics of the first torsion spring are set within the range The force to be absorbed by the member can be reduced.

Hereinafter, an embodiment of the present invention will be described with reference to the accompanying drawings. 1 is a sectional view of a cooking device according to the present invention, FIG. 2 is a partially enlarged top view of a cushioning mechanism, FIG. 3 is a partially enlarged front view of a cushioning mechanism, and FIG. 4 is an external perspective view of a hinge fixing member. ing. In the figure, reference numeral 18 denotes a buffer mechanism, and a buffer member 19 using a rotary oil damper is fixed to a bearing member 21 by a screw 20. Reference numeral 22 is a hinge element connected to the rotation center axis of the cushioning member 19, and a hinge 23 protruding toward the main body of the device, a shaft 24 and a protruding piece 25 protruding in the rotation center axis direction of the cushioning member 19, and an opening / closing door 5 are opened. A stopper 27 that comes into contact with the wall surface 26 of the bearing member 21 and regulates the opening / closing angle of the opening / closing door 5 is integrally provided. 28 is the shaft 24
The first torsion spring is inserted into the hinge member 22. One end of the torsion spring is locked to the hinge element 22 and the other end is brought into contact with a spring bearing 29 provided on the bearing member 21 to urge the opening / closing door 5. Also, 30
Is also a second torsion spring inserted in the shaft 24, one end of which is locked to the projecting piece 25 and the other end of which abuts the spring receiver 31 and is biased in the direction of closing the opening / closing door 5. Reference numeral 32 denotes an adjusting mechanism using a screw provided on the protruding piece 25, which can adjust the operating force of the second torsion spring 30. A cushioning mechanism 18 is composed of the above-mentioned members, and is fixed to the opening / closing door 5 at two predetermined positions. 33 is a positioning portion of the hinge 23
A hinge fixing member having 34 and fixed to the device body 1.

Next, the first torsion spring 28 and the second torsion spring 30
The operating characteristics of will be described. FIG. 5 shows the relationship between the opening / closing angle θ of the opening / closing door 5 and the rotating torque. A is a change curve of the rotating torque acting on the shaft 24 caused by the weight of the opening / closing door 5, and the opening / closing angle is large. The rotation torque increases as much as possible. B shows the operating characteristic of the first torsion spring 28, that is, the torque characteristic acting in the direction of opening the opening / closing door 5. When the door opening / closing angle θ increases, the torque decreases according to the spring constant. Further, C is a resultant force curve of the change curve A and the operation characteristic B, that is, a resultant force of forces acting in the direction of opening the opening / closing door 5. D indicates the operating characteristic of the second torsion spring 30, and the operating force, that is, the force in the direction of closing the opening / closing door 5 increases as the door opening / closing angle θ increases. The operation characteristic D of the second torsion spring 30 is the change curve A and the resultant force curve C.
It is set within the range formed by and.

The other structure is the same as that of the conventional example shown in FIG.

Next, the operation of this embodiment having the above configuration will be described. In the closed state of the open / close door, that is, in the state shown in FIG. 1, the arm 7 receives an upward force by the spring 16,
When the latch switch 17 is engaged with the latch body 17 and the latch switch 9 is turned on via the cam 8 and a cooking start switch (not shown) is turned on in this state, the heating source 3 is activated to start cooking. When the operation button 10 is pressed after cooking, the arm 7 is pressed down via the cam 8, the opening / closing door 5 is opened, and the latch switch 9 is turned off. At this time, the movement of the opening / closing door 5 is gradually opened by the cushioning action of the cushioning mechanism 18.

Next, the operation of the configuration of the embodiment will be described.
First, regarding the assembly, after the assembly of the cushioning mechanism 18 to the opening / closing door 5 is completed, the arm 7 is attached to complete the door unit 35 as shown in FIG. After that, the hinge element 22 protruding from the opening / closing door 5 is inserted into the positioning portion 34 of the hinge fixing member 33 which is fixed to the main body 1 in advance, and the hinge element 22 is fixed by screws or the like, whereby the assembly can be performed. In this way, each component can be easily assembled after individual assembly,
Assembling and mass productivity are improved without assembling the door unit 35 and the shock absorbing mechanism 18 in an unfinished state as in the past, and since the shock absorbing mechanism 18 is provided on the opening / closing door 5 side, a connecting member such as a link rod becomes unnecessary. The structure can be simplified.

Next, the buffer mechanism 18 will be described. When the opening / closing door 5 is opened, the opening / closing door 5 is attached to the hinge element 22 fixed to the main body 1.
The buffer member 19 fixed to the shaft receives a rotational force about the shaft 24. At this time, a rotating torque about the shaft 24 acts as a fulcrum due to the own weight of the opening / closing door 5, and a resultant force (hereinafter simply referred to as a resultant force) with the first torsion spring 28 urged in a direction of opening the opening / closing door 5 is generated. It acts in the direction of opening 5. On the other hand, the second torsion spring 30 whose one end is locked to the protruding piece 25 has an opening / closing angle θ.
And the force to close the opening / closing door 5 increases. Here, the operating characteristic D of the second torsion spring 30
Is set within the range formed by the rotational torque curve A due to the weight of the opening / closing door 5 and the resultant force curve C as shown in FIG. The torque is the resultant force curve C and the second torsion spring 30
The difference from the operating characteristic D (hatched portion) is sufficient. That is, at the door opening / closing angle θn, the buffering capacity of Tn is required in the conventional configuration, but the buffering capacity of ΔTn is sufficient in the present embodiment. As a result, even when a large cushioning capacity is required, the cushioning member 19 having a small capacity can be put into practical use, can be made compact, and can be built in the opening / closing door 5. In FIG. 5, the resultant force curve C changes non-linearly, while the operating characteristic of the second torsion spring 30 changes linearly, so the force ΔTn absorbed by the buffer member 19 changes with the opening / closing angle θ. However, when the opening / closing angle θ increases, a force in the direction of increasing the rotation torque T is applied due to the inertia of the opening / closing door 5 due to its own weight, so that the change in ΔTn is absorbed.

Further, since the stopper 27 is provided integrally with the hinge element 22,
With a simple structure, the opening / closing angle of the opening / closing door 5 can be stopped at a desired position.

Further, since the adjusting mechanism 32 is provided so that the operation characteristic of the second torsion spring 30 can be adjusted, a desired door opening speed can be selected.

EFFECTS OF THE INVENTION As described in detail above, according to the present invention, a door mechanism is provided by providing a cushioning mechanism and a hinge element on the opening / closing door side, and a hinge fixing member having a positioning portion into which one end of the hinge element is inserted is provided on the main body side. Since the above-mentioned structure is provided on the main body side, the opening / closing door can be attached to the main body side after completion of assembly by assembling each constituent element into a unit, and assemblability or mass productivity can be improved.
Further, since the buffer mechanism is provided on the opening / closing door side, the structure can be simplified and the main body can be downsized. On the contrary, the storage room can be enlarged accordingly. Further, the hinge fixing member allows the opening / closing door to be positioned easily with high accuracy.

Further, since the buffer mechanism is provided with the first and second torsion springs, the door can be automatically opened by pressing the operation button for releasing the latch device, and the operability of the door opening operation is improved.

Further, the present invention provides a first torsion spring biased in a direction of opening the opening / closing door and a second torsion spring biased in a direction of closing the opening / closing door, and the operation of the second torsion spring. The characteristic is set within a range of a change curve of the rotational torque acting on the fulcrum of the hinge element with respect to the door opening / closing angle θ caused by the own weight of the opening / closing door, and a resultant force curve of the change curve and the operation characteristic of the first torsion spring. Since the cushioning member can reduce the force to be absorbed, a cushioning member having a small capacity can be put into practical use even when a large cushioning capacity is required, and a compact, lightweight, low-cost cushioning mechanism can be obtained. As a result, the device can be mounted in a small space such as an opening / closing door, and the degree of freedom in design can be improved and the device body can be made smaller and lighter.

[Brief description of the drawings]

FIG. 1 is a sectional view of a cooking device provided with an opening / closing door device according to an embodiment of the present invention, FIG. 2 is a partially enlarged top sectional view of a buffer mechanism of the device, and FIG. 3 is a portion of a buffer mechanism of the device. FIG. 4 is an enlarged front sectional view, FIG. 4 is an external perspective view of a hinge fixing member of the same device, and FIG. 5 is a characteristic diagram showing a relationship between a door opening / closing angle and rotation torque of the device,
FIG. 6 is an external perspective view of a cooker provided with the same device, FIG. 7 is a cross-sectional view of a conventional cooker, and FIG. 8 is a partial side view showing the opened / closed state of the door. 1 ... Main body, 2 ... Storage room, 4 ... Latch device, 5 ...
Open / close door, 10 ... Operation button, 18 ... Buffer mechanism, 19 ... Buffer member, 21 ... Bearing member, 22 ... Hinge element, 24 ... Shaft, 27 ... Stopper, 28 ... First twist Spring, 30
...... Second torsion spring, 32 …… Adjustment mechanism, 33 …… Hinge fixing member, 34 …… Positioning unit, 35 …… Door unit.

Claims (4)

(57) [Claims] 1. An opening / closing door for shutting off a storage chamber provided in a device body from the atmosphere, a cushioning mechanism mounted on the opening / closing door side for cushioning an opening / closing operation of the opening / closing door, and the opening / closing door. A door unit having a hinge element for holding it openably and closably, and a latch device for holding the opening / closing door closed,
The buffer mechanism includes an operation button for releasing the latch device, and a hinge fixing member fixed to the main body side having a positioning portion into which one end of the hinge element is inserted. A fixed bearing member, a shaft provided on the bearing member, a first torsion spring inserted in the shaft and biased in a direction to open the opening / closing door, and a direction to close the opening / closing door. An opening / closing door device provided with a second torsion spring biased to. 2. A bearing member fixed to an opening / closing door, a cushioning member fixed to the bearing member, and a shaft provided on a central axis of the cushioning member, and the opening / closing door is openable / closable with the central axis as a fulcrum. A first torsion spring inserted in the shaft and biased in a direction to open the opening / closing door, and a second torsion spring biased in a direction to close the opening / closing door. A is a change curve of the rotational torque acting on the fulcrum of the hinge element with respect to the door opening / closing angle θ caused by the own weight of the opening / closing door, A is the operating characteristic of the first torsion spring, B is the operating characteristic with the curve A. A shock absorbing mechanism for an opening / closing door device in which a resultant force curve of B is C, and an operation characteristic of the second torsion spring is set within a range formed by the curve A and the resultant force curve C. 3. A buffer mechanism for an opening / closing door apparatus according to claim 2, further comprising a stopper for restricting an opening / closing angle of the opening / closing door. 4. The shock absorbing mechanism for an opening / closing door apparatus according to claim 2, further comprising an adjusting mechanism for adjusting the operating force of the first torsion spring or the second torsion spring.