JP5766672B2 - Opening and closing mechanism of the cooking device lid - Google Patents

Description

  TECHNICAL FIELD The present invention relates to a lid opening / closing mechanism for a cooking device, and more particularly to a lid opening / closing mechanism for a cooking device provided with an upper lid that swings up and down.

  In recent years, in a cooking device equipped with an upper lid that swings up and down like a rice cooker, the operation board and display panel incorporated in the upper lid have increased in size due to higher functionality. The required torque (hereinafter referred to as “open load”) is also increasing. Therefore, the tension (hereinafter referred to as “reaction force”) of the hinge spring used in the lid opening / closing mechanism is also set high. However, the reaction force of this type of hinge spring varies at a certain rate in production, and the variation increases in proportion to the magnitude of the reaction force. It may stop halfway through without opening, or it may open too much to the extent that the main body is exposed.

  In order to solve this problem, in the lid opening / closing mechanism of the conventional heating cooker, the contact plate is engaged with the tip of the arm portion of the hinge spring on the cooker body side, and the contact plate is pressed and supported at a predetermined position by the adjustment screw, An adjustment screw is inserted into and supported by a seat plate fixed to the main body, and it is known that the reaction force of the hinge spring can be adjusted by adjusting the screwing degree of the adjustment screw to the seat plate during assembly. (For example, refer to Patent Documents 1 and 2).

Japanese Utility Model Publication No. 5-16986 Japanese Utility Model Publication No. 4-23468

  However, the conventional lid opening / closing mechanism of the heating cooker is configured to adjust the reaction force by pushing the tip of the arm portion of the hinge spring with the adjustment screw. The amount by which the arm portion is pushed and bent is relatively small, and the amount of bending of the arm portion is also affected, making it difficult to accurately adjust the reaction force of the hinge spring in accordance with the open load of the upper lid. Further, in this configuration, if the distance that the adjustment screw can be advanced is increased in order to increase the amount by which the arm portion of the hinge spring can be pushed and bent, there is a problem that the lid opening / closing mechanism is enlarged accordingly.

  The present invention has been made in view of the above circumstances, and its purpose is to provide a reaction force of the hinge spring in accordance with the opening load of the upper lid in the lid opening / closing mechanism of the heating cooker provided with an upper lid that swings up and down. It is an object of the present invention to provide a lid opening / closing mechanism that can be adjusted accurately and that can reduce the size of the lid opening / closing mechanism.

The present invention is a lid opening / closing mechanism of a cooking device provided with an upper lid that swings up and down in a swinging manner, and a hinge shaft horizontally provided on the back portion of the upper lid and a main body side arm at one end are locked to the cooking appliance main body. The lid side arm at the other end is locked to the upper lid, the hinge spring for biasing the upper lid in the opening direction, and fixed to the back portion of the cooker body, and the hinge shaft can be rotated with respect to the cooker body A hinge fixing plate that is held in a state, and an adjustment plate that is provided opposite to the hinge fixing plate and that engages and supports the main body side arm portion against the reaction force of the hinge spring against the hinge fixing plate. and a threaded portion that allows adjust the pressing degree of the hinge fixing plate side of the adjusting plate, adjustment plate is in contact with the position of the spring body nearer the central portion of the pressing portion of the one end the body-side arm portion The support portion on the other end abuts against the hinge fixing plate, and the position between the pressing portion and the support portion is It is obtained by the structure to be pressed and urged to the hinge fixing plate side by parts.

According to the lid opening / closing mechanism of the heating cooker, when the degree of pressing of the adjustment plate to the hinge fixing plate side is increased by the screw portion, the position closer to the spring main body than the central portion of the main body side arm portion of the hinge spring is Since it is pushed to the hinge fixing plate side against the reaction force of the hinge spring, the arm portion on the main body side can be largely pushed and bent by a relatively small tightening operation of the screw portion. In addition, in this case, the pressing portion on one end side of the adjustment plate is the point of action, the supporting portion on the other end side is the fulcrum, and the position between the pressing portion and the supporting portion is the force point. Since it is pressed to the fixed plate side, the arm portion of the hinge spring can be pushed and bent with a small force as compared with a configuration in which the arm portion of the hinge spring is directly pressed by the screw portion.

Further, the present invention is a lid opening / closing mechanism of a cooking device provided with an upper lid that swings up and down, and a hinge shaft horizontally provided on the back surface of the upper lid, and a main body side arm portion at one end on the cooking device body. Locked, the lid side arm at the other end is locked to the upper lid, hinge spring that urges the upper lid in the opening direction, and fixed to the back of the cooker body, and the hinge shaft rotates relative to the cooker body A hinge fixing plate that is held in a possible state, and an adjustment plate that is provided opposite to the hinge fixing plate and that engages and supports the main body side arm portion against the reaction force of the hinge spring against the hinge fixing plate. And a screw portion that enables adjustment of the degree of pressing of the adjustment plate toward the hinge fixing plate , and the adjustment plate is pressed against the spring body at a position closer to the spring body than the central portion of the body side arm section. And a supporting piece that abuts against the hinge fixing plate in a pressed state. Ru der what position is configured to be pressed and urged to the hinge fixing plate side by the screw portion between.

  In this case, the pressing piece of the adjusting plate serves as an operating point, the supporting piece serves as a fulcrum, and the position between the holding piece and the supporting piece serves as a force point to press the main body side arm portion toward the hinge fixing plate. Therefore, the arm portion of the hinge spring can be pushed and bent with a small force as compared with a configuration in which the arm portion of the hinge spring is directly pressed by the screw portion.

  In the lid opening / closing mechanism of the cooking device, the screw portion is screwed to the adjustment bolt and protrudes from the hinge fixing plate toward the adjustment plate, and the adjustment plate is pressed against the hinge fixing plate. It is desirable that it is composed of an adjusting nut that is energized.

  In this case, since the reaction force of the hinge spring applied to the adjustment plate can be received by the respective seating surfaces of the adjustment bolt and the adjustment nut, problems such as breakage and deformation are unlikely to occur in the screw portion.

  In the lid opening / closing mechanism of the heating cooker, the amount of change in the reaction force of the hinge spring increases as the opening degree of the upper lid increases, and the reaction force of the hinge spring applied to the upper lid changes in a curved manner. Is desirable.

  The opening load of the upper lid configured to swing up and down is reduced as the opening degree increases due to the movement of the center of gravity, but the amount of change per unit time of the opening load increases as the opening degree increases. . However, according to the lid opening / closing mechanism of the cooking device, the reaction force of the hinge spring applied to the upper lid also changes along with the curvilinear change of the opening load of the upper lid. Not likely to occur.

  In the lid opening / closing mechanism of the cooking device, the hinge fixing plate is preferably provided with a hook portion capable of engaging the main body side arm portion.

  In this case, when assembling, the body side arm of the hinge spring can be engaged and supported by the adjustment plate after engaging the hook side with the body side arm of the hinge spring. It does not take.

  According to the present invention, the arm portion of the hinge spring can be largely pushed and bent with a relatively small tightening operation of the screw portion. Therefore, the reaction force of the hinge spring can be accurately adjusted according to the opening load of the upper lid, and the lid can be opened and closed. It is also possible to reduce the size of the mechanism.

FIG. 1 is a schematic perspective view showing a lid opening / closing mechanism of a cooking device according to an embodiment of the present invention. FIG. 2 is an enlarged perspective view of the periphery of the lid opening / closing mechanism of the cooking device according to the embodiment of the present invention. FIG. 3 is a schematic rear view of the periphery of the lid opening / closing mechanism of the cooking device according to the embodiment of the present invention. FIG. 4 is a partially exploded perspective view of the lid opening / closing mechanism of the cooking device according to the embodiment of the present invention. FIG. 5 is a graph showing a change in open load and a reaction force change in the hinge spring with respect to the opening degree of the upper lid in the lid opening / closing mechanism of the cooking device according to the embodiment of the present invention.

Next, embodiments for carrying out the present invention will be described in detail with reference to the accompanying drawings.
As shown in FIG. 1, the lid opening / closing mechanism 2 of the heating cooker 1 according to the embodiment of the present invention is a hinge part that connects the cooker body 11 in a state in which the upper lid 12 can swing up and down. A hinge shaft 21 laid horizontally on the back surface of the upper lid 12, two hinge springs 22 for urging the upper lid 12 in the opening direction, and the hinge shaft 21 fixed to the back surface of the cooker body 11. A hinge fixing plate 23 that is held in a rotatable state, and an arm portion on the cooker main body 11 side of the hinge spring 22 (hereinafter referred to as “main body side”). An adjusting plate 24 that engages and supports the arm 221) against the reaction force of the hinge spring 22, and an oil damper 25 that limits the opening and closing speed of the upper lid 12. 24 is hinge fixing plate 3 is fixed, and a adjusting bolt 26 and the adjustment nut 27 as a screw portion that allows adjust the pressing degree of the hinge fixing plate 23 side of the adjusting plate 24. The lid opening / closing mechanism 2 is covered with an outer cover (not shown) from the back side of the cooker body 11. An operation switch and a display panel are disposed on the front portion of the upper lid 12.

  As shown in FIG. 2 and FIG. 3, a pair of hinge side walls 111 facing left and right are provided on the upper back of the cooker body 11. Further, a hinge front wall 112 is provided on the front side of the hinge side wall 111 so as to connect the front side edges of the hinge side wall 111 to each other. That is, a substantially U-shaped standing wall in plan view that opens to the back side of the cooker body 11 is formed by the hinge side wall 111 and the hinge part front wall 112 at the upper back of the cooker body 11. On the other hand, a pair of shaft fixing walls 121 are provided at the lower back of the upper lid 12 so as to oppose the outer surfaces of the hinge side walls 111, and the hinge shaft 21 is located between the inner surfaces of the shaft fixing walls 121. It is laid horizontally.

  An oil damper 25 is connected to the central portion of the hinge shaft 21, and a predetermined rotational resistance corresponding to the rotation speed is applied to the hinge shaft 21. Further, both ends of the hinge shaft 21 are connected and fixed separately to the shaft fixing wall 121 of the upper lid 12, and the position of the central portion of the connecting portion is at the upper edge of the hinge side wall 111 of the cooker body 11. Supported from below. The outer surface of the oil damper 25 is formed with a foot 252 that contacts the back surface of the hinge front wall 112 and prevents the oil damper 25 from rotating.

  The hinge spring 22 is a torsion coil spring, and a coil portion 220 as a spring body is provided in a region between the hinge portion side wall 111 and the oil damper 25 on the outer periphery of the hinge shaft 21. Further, the main body side arm portion 221 at one end of the hinge spring 22 extends downward from the outer peripheral back side of the hinge shaft 21 in a state where it is fixed to the hinge fixing plate 23 side by the adjustment plate 24, and then gradually from there to the back side. And is further extended downward. On the other hand, an arm portion (hereinafter referred to as “lid-side arm portion”) 222 on the upper lid 12 side of the hinge spring 22 extends obliquely upward from the outer peripheral rear surface side of the hinge shaft 21 and gently curves downward therefrom. Furthermore, it extends substantially horizontally to the front side.

  The position of the main body side arm 221 closer to the base than the center, that is, the position closer to the coil portion 220 is locked by a pressing piece 242 (described later) of the adjustment plate 24. On the other hand, the front end portion of the lid-side arm portion 222 is locked inside the upper lid 12. Therefore, when the upper lid 12 is closed, the main body side arm portion 221 and the lid side arm portion 222 are pressed in the direction in which the coil portion 220 is compressed, and the restoring force against the compression of the coil portion 220 is counteracted by the hinge spring 22. A force is applied to the upper lid 12 in the opening direction.

  As shown in FIG. 4, the hinge fixing plate 23 includes a fixing plate body 231 having a substantially U-shaped cross section that protrudes toward the back side (adjustment plate 24 side), and the front side of the hinge portion from both side edges of the fixing plate body 231. The seat plate 232 extends outward along the wall 112, and the side plate 233 erected from the outer edge of the seat plate 232 toward the back side of the hinge fixing plate 23. The seat plate 232 is hinged. By screwing to the front wall 112, it is fixed to the back surface of the cooker body 11.

  A pair of substantially L-shaped temporary plates are provided at the left and right positions across the vertical center line of the fixed plate body 231 as a hook for engaging the body side arm 221 of the hinge spring 22 during assembly. A stop hook 234 is formed to protrude outwardly toward the back side of the hinge fixing plate 23. These temporary fixing hooks 234 are disposed at positions outside the side edge of the adjustment plate 24.

  An adjustment bolt 26 protrudes rearward (on the adjustment plate 24 side) at a position on the vertical center line of the fixed plate main body 231 and near the upper edge thereof. The head portion 261 of the adjustment bolt 26 is fixed to the front side (the hinge front wall 112 side) of the fixed plate main body 231 in a rotation-blocking state, and its seating surface is in contact with the front portion of the fixed plate main body 231. Yes. On the other hand, an adjustment nut 27 is screwed to the shaft portion 262 of the adjustment bolt 26 from the back side of the adjustment plate 24, and its seating surface is brought into contact with the back surface portion of the adjustment plate 24. A pressing force is applied to the hinge fixing plate 23 side. Therefore, if the tightening amount of the adjustment nut 27 with respect to the adjustment bolt 26 is adjusted, the distance between the adjustment plate 24 and the hinge fixing plate 23 changes, and the degree of pressing of the main body side arm 221 toward the hinge fixing plate 23 is adjusted. Is done.

  A plate receiving piece 235 is erected on the lower edge portion of the fixed plate main body 231 toward the back side thereof. The plate receiving piece 235 is provided with two engagement holes 236 for fitting engagement claws 243 (described later) of the adjustment plate 24.

  A substantially central portion of the fixing plate main body 231 bulges out in a truncated cone shape toward the back side thereof, and a screw hole 237 for fixing the above-described outer cover (not shown) is formed at the central position of the bulging portion. It has been established.

  A substantially C-shaped retaining hook 238 for engaging and holding the hinge shaft 21 is formed on the upper portion of the side plate 233. The hinge shaft 21 is formed by the retaining hook 238 and the upper edge of the hinge side wall 111. The vicinity of both ends is supported in a rotatable state.

  The adjustment plate 24 is formed of a substantially rectangular metal steel plate, and a bolt insertion hole 241 through which the adjustment bolt 26 is inserted is formed on the vertical center line and near the upper edge. In addition, pressing pieces 242 having a U-shaped cross section that are concave toward the front side are formed on the upper portions of both side edges of the adjustment plate 24. The inner side of the concave portion of the pressing piece 242 faces the position closer to the coil portion 220 than the intermediate portion of the body side arm portion 221 of the hinge spring 22, and the upper edge portion of the pressing piece 242 is the central portion of the bolt insertion hole 241. That is, it is located above the axial height of the adjusting bolt 26. Accordingly, when the adjustment nut 27 is tightened to the first predetermined position, the upper edge of the inner side of the recess of the pressing piece 242 is closer to the coil portion 220 than the intermediate portion of the main body side arm 221 of the hinge spring 22 and the adjustment bolt 26. It abuts further upward and presses the main body side arm 221 toward the hinge fixing plate 23 side.

  On the other hand, on both side portions of the lower edge of the adjusting plate 24, an engaging claw 243 is formed to project obliquely downward on the back surface side, and the engaging claw 243 is an engaging hole formed in the plate receiving piece 235. 236. Further, a support piece 244 is formed at the lower part of both side edges of the adjustment plate 24 so as to protrude obliquely outward from the front side. When the adjustment nut 27 is tightened to the second predetermined position, the tip of the support piece 244 is moved. The hinge fixing plate 23 comes into contact with the back surface of the fixed plate main body 231 in a pressed state.

  A circular hole 247 is formed at a substantially central position of the adjustment plate 24, and the screw hole 237 of the fixing plate main body 231 faces the back side of the cooker main body 11 from the circular hole 247. The fixing screw for fixing the outer cover (not shown) is screwed and connected to the screw hole 237 of the fixing plate main body 231 through the circular hole 247. An annular rib 248 is formed on the back surface of the adjustment plate 24 along the peripheral edge of the circular hole 247, and excessive bending of the adjustment plate 24 is suppressed by the rib 248.

  In this case, at the time of assembly, first, two hinge springs 22 are mounted on a hinge shaft 21 that is connected to an oil damper 25 in advance, and the hinge shaft 21 is horizontally fixed between the shaft fixing walls 121 of the upper lid 12. After that, the lid side arm portion 222 of the hinge spring 22 is engaged and fixed to the upper lid 12, and the upper lid 12 is overlapped with the closed position of the cooker body 11. In this state, the retaining hook 238 provided on the side plate 233 of the hinge fixing plate 23 is hooked on the hinge shaft 21, and the seat plate 232 is screwed and fixed to the hinge portion front wall 112 of the cooker body 11. Thereby, the upper lid 12 is connected to the cooker body 11 in a state where the upper lid 12 can swing up and down.

  Next, the upper lid 12 is set in the open position, and the main body side arm portion 221 of the hinge spring 22 is engaged with the temporary fixing hook 234 of the hinge fixing plate 23 from the outside to be temporarily fixed. In this state, when the upper lid 12 is returned to the closed position again, the coil portion 220 of the hinge spring 22 is compressed and held with a predetermined reaction force.

  Then, the engagement claw 243 of the adjustment plate 24 is fitted into the engagement hole 236 provided in the plate receiving piece 235 of the hinge fixing plate 23, and the fixing plate of the hinge fixing plate 23 is inserted into the bolt insertion hole 241 of the adjustment plate 24. The shaft portion 262 of the adjustment bolt 26 provided in the main body 231 is inserted, and the adjustment nut 27 is screwed and connected to the shaft portion 262. At this time, the pressing piece 242 is not pressed and brought into contact with the main body side arm portion 221 of the hinge spring 22, and the support piece 244 is also not pressed and brought into contact with the fixed plate body 231 of the hinge fixing plate 23.

  When the adjustment nut 27 is further tightened in this state, the upper edge inside the concave portion of the holding piece 242 is positioned closer to the coil portion 220 than the intermediate portion of the body side arm portion 221 of the hinge spring 22 (hereinafter referred to as “the root”). The tip of the support piece 244 abuts against the back surface of the fixed plate main body 231 of the hinge fixing plate 23 in a pressed state, and the main body side arm 221 of the hinge spring 22 is connected to the hinge fixing plate 23. It is pushed and bent to the side, that is, the coil portion 220 is compressed. As a result, the reaction force of the hinge spring 22 gradually increases.

  At this time, the pressing piece 242 is pressed and abutted against the arm portion 221 of the hinge spring 22 to be elastically deformed, and the support piece 244 is also pressed and abutted to the fixing plate body 231 of the hinge fixing plate 23 to be elastically deformed. The adjustment plate 24 itself is also elastically deformed. The adjustment plate 24 has sufficient rigidity to engage and support the main body side arm portion 221 in a pressed state. The pressing piece 242, the support piece 244, and the adjustment plate 24 itself are elastically deformed. The degree is smaller than the degree of elastic deformation of the hinge spring 22.

  As described above, according to the lid opening / closing mechanism 2 according to the above embodiment, the reaction force of the hinge spring 22 applied to the upper lid 12 according to the open load of the upper lid 12 can be adjusted only by adjusting the tightening amount of the adjustment nut 27. Since it can be adjusted, the assembly workability is good.

  In particular, in this case, when the biasing degree of the adjustment plate 24 toward the hinge fixing plate 23 is increased by the adjustment nut 27, the base portion of the main body side arm portion 221 of the hinge spring 22 resists the reaction force. Since it is pushed to the hinge fixing plate 23 side, the main body side arm 221 of the hinge spring 22 can be largely pushed and bent by a relatively small tightening operation of the adjusting nut 27. Therefore, the reaction force of the hinge spring 22 can be accurately adjusted according to the open load of the upper lid 12. In addition, since the shaft portion 262 of the adjustment bolt 26 does not have to be longer than necessary, the lid opening / closing mechanism 2 can be downsized.

  Further, the adjustment plate 24 includes a pressing piece 242 that comes into contact with the main body side arm 221 of the hinge spring 22 in a pressed state and a support piece 244 that comes into contact with the hinge fixing plate 23 in a pressed state. The position between the pressing piece 242 and the support piece 244 is configured to be pressed and biased toward the hinge fixing plate 23 by the adjustment nut 27, and when the adjustment nut 27 is tightened, the holding piece 242 on the adjustment plate 24. Is the working point, the support piece 244 is the fulcrum, and the contact portion of the adjusting nut 27 located between the holding piece 242 and the support piece 244 is the force point, and the main body side arm portion 221 is moved to the hinge fixing plate 23 side. Press to. Accordingly, the main body side arm portion 221 of the hinge spring 22 can be applied with a small force as compared with the conventional lid opening / closing mechanism configured to press the front end side of the arm portion of the hinge spring directly by the adjusting screw. Can be bent. Therefore, the reaction force of the hinge spring 22 can be easily adjusted according to the open load of the upper lid 12, and the assembly workability is further improved.

  In this case, the seating surface of the head portion 261 of the adjusting bolt 26 is brought into contact with the front surface portion of the fixing plate body 231 of the hinge fixing plate 23, while the seating surface of the adjusting nut 27 is placed on the back surface portion of the adjusting plate 24. Therefore, the reaction force of the hinge spring 22 applied to the adjustment plate 24 can be received by the respective seating surfaces of the adjustment bolt 26 and the adjustment nut 27. Therefore, problems such as breakage and deformation are unlikely to occur in the threaded portion (adjustment bolt 26 and adjustment nut 27).

  By the way, as shown in FIG. 5, the open load N of the upper lid configured to swing open and close up and down decreases as the opening degree increases due to the movement of the center of gravity, but the change of the open load N per unit time. The amount increases as the opening increases. On the other hand, the reaction force T1 of the hinge spring configured as in the conventional lid opening / closing mechanism decreases as the opening degree of the upper lid increases, but the amount of change per unit time of the reaction force T1 is substantially constant. . Therefore, depending on the setting of the reaction force T1 of the hinge spring, as shown in the range S, the open load N of the upper lid exceeds the reaction force T1 of the hinge spring, and the upper lid is not fully opened (a state where it does not fully open but stops halfway). May invite. If the reaction force T1 of the hinge spring is set to be large so that the range S does not occur, the reaction force T1 of the hinge spring with respect to the open load N becomes too large as the opening degree of the upper cover increases, and the upper cover is excessive. There is also a possibility of inviting an opening (a state where the main body is opened too much to be violent).

  However, according to the lid opening / closing mechanism 2 according to the above embodiment, when the upper lid 12 is opened, the restoring force against the elastic deformation of the hinge spring 22 and the elastic deformations of the pressing piece 242, the support piece 244, and the adjusting plate 24 are provided. And the amount of change in the reaction force of the hinge spring 22 increases as the opening degree of the upper lid 12 increases. That is, as shown in FIG. 5, the reaction force T2 of the hinge spring 22 applied to the upper lid 12 also changes in a curved manner in accordance with the curvilinear decrease in the open load N of the upper lid 12. Accordingly, it is difficult for the upper lid 12 to be opened poorly or excessively opened, and the reaction force T2 of the hinge spring 22 can be adjusted more accurately and easily in accordance with the open load N of the upper lid 12.

  Further, in this case, a temporary fixing hook 234 capable of engaging with the main body side arm 221 of the hinge spring 22 is provided on the back surface portion of the hinge fixing plate 23. After the arm portion 221 is engaged, the main body side arm portion 221 can be engaged and supported from the back side of the hinge fixing plate 23 by the adjustment plate 24. Therefore, it is not necessary to perform a laborious operation of attaching the adjustment plate 24 in this state while pressing the main body side arm portion 221 by hand. Therefore, the assembly workability is further improved.

  The lid opening / closing mechanism 2 according to the present invention can be applied to a heating cooker having an upper lid that swings up and down, such as a rice cooker and a bread maker, and is particularly configured in consideration of exhaust and exhaust heat. It is useful for gas rice cookers with a relatively heavy upper lid.

  In the above-described embodiment, the adjustment bolt 26 protrudes rearward from the hinge fixing plate 23, and the adjustment nut 27 is screwed and connected to the shaft portion 262 of the adjustment bolt 26 from the back side of the adjustment plate 24. As described above, the adjustment bolt 26 is provided on the adjustment plate 24 so as to protrude forward (on the hinge fixing plate 23 side), and the shaft portion 262 of the adjustment bolt 26 is adjusted from the front side of the fixing plate main body 231 of the hinge fixing plate 23. The nut 27 may be screwed and connected. In this case, the adjustment nut 27 is fixed to the front side (the hinge front wall 112 side) of the fixed plate main body 231 in a rotation-blocking state, and its seating surface comes into contact with the front portion of the fixed plate main body 231. . Further, the seating surface of the head portion 261 of the adjustment bolt 26 is brought into contact with the back surface portion of the adjustment plate 24, and the adjustment plate 24 is pressed and biased toward the hinge fixing plate 23 side. Therefore, if the amount of tightening of the adjusting bolt 26 with respect to the adjusting nut 27 is adjusted, the degree of pressing of the adjusting plate 24 toward the hinge fixing plate 23 is adjusted, whereby the same effect as the above embodiment can be exhibited. .

  Moreover, in the said embodiment, although the torsion coil spring was used as a hinge spring, you may use the leaf | plate spring comprised by the spring main body and two arm parts as a hinge spring. In this case, the spring main body is fixed to the hinge fixing plate 23, or a loop portion is provided on the spring main body, and this loop portion is attached to the hinge shaft 21.

1 Rice cooker (heating cooker)
11 Cooker body 12 Upper lid 2 Lid opening / closing mechanism 21 Hinge shaft 22 Hinge spring 220 Coil portion (spring body)
221 Body side arm portion 222 Cover side arm portion 23 Hinge fixing plate 24 Adjustment plate 26 Adjustment bolt 27 Adjustment nut

Claims (5)

A lid opening / closing mechanism of a heating cooker having an upper lid that swings up and down,
A hinge shaft laid horizontally on the back of the upper lid;
A hinge spring that engages the main body side arm at one end with the cooker main body, the lid side arm at the other end engages with the upper lid, and biases the upper lid in the opening direction;
A hinge fixing plate fixed to the back surface of the cooker body and holding the hinge shaft in a rotatable state with respect to the cooker body;
An adjustment plate provided opposite to the hinge fixing plate and engaged and supported in a state in which the main body side arm portion is pressed against the hinge fixing plate side against the reaction force of the hinge spring;
A screw portion that enables adjustment of the degree of pressing of the adjustment plate toward the hinge fixing plate,
The adjustment plate has a pressing portion on one end side that is in contact with a position closer to the spring body than the central portion of the main body side arm portion, and a support portion on the other end side that is in contact with the hinge fixing plate. A lid opening / closing mechanism of the cooking device, wherein the position between the two is pressed and urged toward the hinge fixing plate by the screw portion . A lid opening / closing mechanism of a heating cooker having an upper lid that swings up and down,
A hinge shaft laid horizontally on the back of the upper lid;
A hinge spring that engages the main body side arm at one end with the cooker main body, the lid side arm at the other end engages with the upper lid, and biases the upper lid in the opening direction;
A hinge fixing plate fixed to the back surface of the cooker body and holding the hinge shaft in a rotatable state with respect to the cooker body;
An adjustment plate provided opposite to the hinge fixing plate and engaged and supported in a state in which the main body side arm portion is pressed against the hinge fixing plate side against the reaction force of the hinge spring;
A screw portion that enables adjustment of the degree of pressing of the adjustment plate toward the hinge fixing plate,
The adjustment plate has a pressing piece that contacts in a pressed state at a position closer to the spring body than the central portion of the main body side arm, and a supporting piece that contacts the hinge fixing plate in a pressing state. A lid opening / closing mechanism of the cooking device, wherein the position between the two is pressed and urged toward the hinge fixing plate by the screw portion. In the lid opening / closing mechanism of the heating cooker according to claim 1 or 2,
The screw portion is composed of an adjustment bolt that protrudes from the hinge fixing plate toward the adjustment plate side, and an adjustment nut that is screwed to the adjustment bolt and presses and biases the adjustment plate toward the hinge fixing plate side. Opening and closing mechanism of the cooking device. In the lid opening / closing mechanism of the heating cooker according to any one of claims 1 to 3,
A lid opening / closing mechanism of a heating cooker configured such that the amount of change in the reaction force of the hinge spring increases as the opening degree of the upper lid increases, and the reaction force of the hinge spring applied to the upper lid changes in a curve. In the lid opening / closing mechanism of the heating cooker according to any one of claims 1 to 4,
A lid opening / closing mechanism of a heating cooker, wherein a hook fixing portion capable of engaging the main body side arm portion is provided on a hinge fixing plate.

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