JPH0639607Y2 - Opening / closing lid braking device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention relates to a braking device for an opening / closing lid of a container, for example, a braking device for a lid of an electric rice cooker.

[Conventional technology]

The lid of the electric rice cooker is biased in the opening direction by the force of a hinge spring mounted around the hinge pin, and the lid is automatically opened when the lid is unlocked.

In an electric rice cooker provided with such a lid, a lid braking device is provided in order to prevent the lid from returning in the closing direction due to a reaction when the lid is opened to the maximum extent. As shown in FIG. 8, the braking device generally used conventionally is as follows.
A cam 41 is provided on the lid 40, and an L-shaped leaf spring 43 is attached to the container body 42 side.

The cam 41 is formed such that its radius of curvature gradually increases as the rotation angle of the lid 40 increases, and the leaf spring is opened at the maximum opening angle.
The cam 43 is most strongly pressed by the cam 41 to exert a strong braking force.

[Problems to be solved by the device]

In the braking device as described above, a strong braking force may act before the lid 40 is completely opened due to variations in the spring constant of the leaf spring 43, the mounting accuracy, and the like, and the lid 40 may not be completely opened.

Then, this invention makes it a technical subject to provide the braking device which can apply a braking certainly and can open a lid completely.

[Means for Solving the Problems]

In order to solve the above problems, the present invention provides a hinge spring 3 which exerts an elastic force on the hinge portion of the container body 1 in the opening direction of the lid 2, and when the lid 2 is opened and closed between the lid 2 and the container body 1. In a braking device for an opening / closing lid provided with leaf springs 4 that slide with each other, one end of the leaf spring 4 is fixed to the lid 2, and the free end 5 side of the other end is bent at a right angle to the surface of the lid 2. , Container body 1
The free end 5 forms a first braking surface 6 and a second braking surface 7 that are in sliding contact with each other when the lid 2 is opened, and the first braking surface 6 has a required radius of curvature centered on the hinge pin 8. The second braking surface 7 is formed so as to be inside the radius of curvature of the first braking surface 6.

[Action]

When the lid 2 is unlocked, the elasticity of the hinge spring 3 automatically opens the lid 2. When the opening angle of the lid 2 reaches a required angle, the free end 5 of the leaf spring 4 is brought into sliding contact with the first braking surface 6, and the frictional force due to the sliding contact brakes the rotation of the lid 2. When the lid 2 approaches the upright state, the free end 5 of the leaf spring 4 moves onto the second braking surface 7 and comes into sliding contact with the second braking surface 7. Since the second braking surface 7 is formed so as to be inside the radius of curvature of the first braking surface 6, the braking force becomes weak. As a result, the elasticity of the hinge spring 3 for opening the lid 2 becomes strong, and the lid 2 reaches the maximum opening angle and stops.

〔Example〕

FIG. 1 shows an electric rice cooker according to an embodiment, and a lid 2 is attached to a rear end of a container 1 so as to be openable and closable. The container body 1 includes a body member 10 and a shoulder member 11.

As shown in FIG. 2, a lid ring 12 is attached to the lid 2 along the peripheral edge of the lower surface thereof. A locking claw 13 is projected from the front end of the lid ring 12 and is engaged with the hook 14. When the hook button 15 is pushed in, the hook 14 moves backward and is disengaged from the locking claw 13. As shown in FIG. 3, a pair of left and right hinge portions 16, 16 are provided at the rear end portion of the lid ring 12, and a pair of left and right outer hinge receivers 17a provided on the shoulder member 11 by the hinge pin 8 are provided. It is attached to the hinge receiver 17b so that it can be freely opened and closed. A hinge spring 3 is fitted around the hinge pin 8, one end of the hinge spring 3 is brought into contact with the lower surface of the reinforcing bar 18 of the lid ring 12 (see FIG. 5), and the other end is brought into contact with the inside of the support fitting 19 of the shoulder member 11. . This gives the lid 2 elasticity in the opening direction.

A leaf spring 4 for braking, which is bent in an L shape, is attached to the middle of the pair of left and right hinge portions 16 of the lid ring 12. One end of the leaf spring 4 is placed horizontally on the screw hole protrusion 20,
It is fixed with screws 21 (see FIGS. 5 and 6). The free end 5 of the leaf spring 4 is bent downward, and two stages of waist bending portions are provided in the middle thereof to provide elasticity.

Further, the inner hinge receiver 17 of the one hinge receiver 17a, 17b
A first braking surface 6 and a second braking surface 7 facing the leaf spring 4 are provided at the upper corner portion of b.

These braking surfaces 6 and 7 are, as shown in FIG.
Has a radius of gyration larger than the locus of rotation of the free end 5, and the first braking surface 6 is formed along the direction of rotation at the time of its opening,
The second braking surface 7 is provided continuously to this.

The first braking surface 6 is formed at an upper corner portion of the inner hinge receiver 17b and has a constant turning radius R about the hinge pin 8.
Have. The second braking surface 7 is formed by a horizontal surface continuous with the end of the first braking surface 6 and is formed so as to be inside the radius of gyration R described above.

Therefore, when the lid 2 is opened, the free end 5 of the leaf spring 4 is bent by first coming into contact with the first braking surface 6, but the amount of bending is slightly reduced on the second braking surface 7, and the braking force is increased. become weak.

In addition, behind each of the above hinge receivers 17a and 17b is a closing lid 23.
Although it is closed by (see FIG. 3 and FIG. 5), a stopper 24 formed by a horizontal groove is formed on the outer surface of the closing lid 23. This stopper 24 has a lid 2 that is opened to the maximum.
The trailing edge of is hit and stopped.

The maximum opening angle of the lid 2 is set so that the lid 2 is inclined slightly backward beyond the upright state. As shown in FIG. 6, the center of gravity G of the lid 2 is such that when the lid 2 is in the upright state,
It is on the center line of the hinge pin 8. Therefore, until the lid 2 is in the upright state, the weight of the lid 2 generates a torque in the direction of closing the lid 2, but when the lid 2 exceeds the upright state, the direction of the torque changes and the weight of the lid 2 moves in the direction to open the lid 2. Generates torque.

In addition, FIG. 7 shows a mounting structure of the steam cap 26. The steam cap 26 is inserted into the steam hole 27 of the lid 2 from below. The brim 28 formed around the steam cap 26 is engaged around the steam hole 27, and the cap pressing claw 29 (see FIG. 3) provided on the lid ring 12 is pressed against the lower surface of the brim 28 to fix it. To support. A steam hole packing 30 is mounted on the outer circumference of the lower end of the steam cap 26, and a steam valve chamber 32 having a ball 31 built therein is mounted on the inner circumference of the packing 30. The packing 30 is placed on the inner lid 33 of the lid 2.

Further, as shown in FIG. 3, the shoulder member 11 is provided with a dew discharge port 34, and a dew guide groove 35 inclined toward the dew discharge port 34 is provided.

The electric rice cooker of the embodiment is as described above. When the hook button 15 shown in FIG.
Is automatically released by the elastic force of the hinge spring 3. When the opening angle of the lid 2 reaches a predetermined angle, the free end 5 of the leaf spring 4 first comes into sliding contact with the first braking surface 6, and the opening of the lid 2 is braked by the frictional resistance.

When the opening angle is further increased, the lid 2 becomes upright, and the center of gravity G of the lid 2 exceeds the center line of the hinge pin 8 and moves outward from the position of the hinge pin 8. Therefore, the weight of the lid 2 and the elastic force of the hinge spring 3 act, and at the same time, the free end 5 of the leaf spring 4
Is transferred to the second braking surface 7, the braking force of the leaf spring 4 becomes weaker. In this way, when the lid 2 pivots slightly rearward from the upright state, the rear edge of the lid 2 hits the stopper 24,
The lid 2 stops. That is, the lid 2 is strongly braked when the required angle is reached, and the braking force becomes weaker when the lid 2 approaches the upright state, the force in the opening direction increases, and the lid 2 hits the stopper 24 and stops.
When closing the lid 2, the hook 14 is engaged with the locking claw 13 by applying a force in the opposite direction to the above.

[Effect of device]

As described above, in this invention, the braking force by the leaf spring is weakened when the lid approaches the upright state.Therefore, when the lid is opened, the lid is braked and the lid can be fully opened surely. it can.

[Brief description of drawings]

FIG. 1 is a perspective view of an electric rice cooker of an embodiment, FIG. 2 is an enlarged sectional view of the same, FIG. 3 is an exploded perspective view of a hinge portion of a lid, and FIG. 4 is a sectional view of a hinge portion of a lid. Fig. 5 shows V- in Fig. 4
FIG. 6 is a sectional view taken along line V, FIG. 6 is an explanatory view of the braking action of the lid, FIG. 7 is a sectional view of a steam cap portion, and FIG. 8 is a sectional view of a conventional lid braking device. 1 ... Container body, 2 ... Lid, 3 ... Hinge spring, 4 ... Leaf spring, 5 ... Free end, 6 ... First braking surface, 7 ... Second braking surface, 8 ... Hinge pin, 10 ...... Body member, 11 ...... Shoulder member, 12 ...... Lid ring, 13 ...... Locking claw, 14 ...... Hook, 15 ...... Hook button, 16 ...... Hinge part, 17a ...... Outer hinge receiver, 17a ... … Inner hinge receiver, 18 …… Reinforcing bar, 19 …… Supporting metal, 20 …… Screw hole protrusion, 21 …… Screw, 22 …… Brake surface, 23 …… Occlusion lid, 24 …… Stopper, 26 …… Steam Cap, 27 …… Steam hole, 28 …… Brim, 29 …… Holding claw, 30 …… Packing, 31 …… Ball, 32 …… Steam valve chamber, 33 …… Middle lid, 34 …… Dew discharge port, 35 …… Dew guide groove.

Claims (1)

[Scope of utility model registration request] 1. A hinge spring 3 which exerts an elastic force in the opening direction of the lid 2 is provided at a hinge portion of the container body 1, and the lid 2 and the container body 1 are provided.
In the braking device for the opening / closing lid, a leaf spring 4 that slides with each other when the lid 2 is opened and closed is provided between
One end of the first braking surface 6 is fixed to the lid 2, the other end of the free end 5 is bent at a right angle to the surface of the lid 2, and the free end 5 is slidably contacted to the container body 1 when the lid 2 is opened. And a second braking surface 7 are formed, the first braking surface 6 is formed to have a required radius of curvature centered on the hinge pin 8, and the second braking surface 7 is located inside the radius of curvature of the first braking surface 6. A braking device for an opening / closing lid, which is formed as described above.