JPS6230764B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a pressure cooker in which a packing is interposed between a pot and a lid to form a sealed pressurized container, and is intended to facilitate the operation of opening the lid after cooking is completed.

Conventionally, in this type of pressure cooker, the packing has been a horizontal surface on both the upper and lower surfaces. After cooking, when the pressure inside the pot decreases due to a decrease in the pot temperature, the lid is pulled downward, and the packing is more strongly pressed between the pot and the lid, and is adsorbed to the pot and the lid.
If the packing sticks to the pot and lid, even if you remove the pressure adjustment weight and return the pressure inside the pot to atmospheric pressure, the sticking phenomenon of the packing will not be resolved, and the lid will not be able to be rotated horizontally due to its suction force. The drawback was that the lid often became impossible to open.

The present invention solves the above-mentioned drawbacks of the conventional pressure cooker, and embodiments of the present invention will be described below with reference to the accompanying drawings.

In the figure, 1 is a cylindrical main body, 2 is a partition plate that divides the inside of the main body 1 into upper and lower parts, and 3 is a heating element placed on the partition plate 2. Reference numeral 4 denotes a bottomed cylindrical pot placed on the heating element 3, and a bayonet-shaped engaging portion 5 is formed at the upper end. Reference numeral 6 denotes a lid that covers the upper opening of the pot 4, and a bayonet-shaped engaging portion 7 on the outer periphery.
is formed, and by horizontally rotating the lid 6, the pot 4
The engaging portion 5 of the lid 6 and the engaging portion 7 of the lid 6 engage with each other.
Reference numeral 8 denotes a ring-shaped packing having a T-shaped cross section and interposed between the engaging part 5 of the pot 4 and the engaging part 7 of the lid 6. This packing 8 includes a substantially horizontal holding part 9 held between the engaging parts 5 and 7, an upper extending part 10 and a lower extending part 11 extending vertically from the inner peripheral end of the holding part 9. The cross section is approximately T-shaped. 12
are protruding parts integrally formed on the upper and lower surfaces of the holding part 9, and are elongated in the radial direction.
Note that the pot 4, the lid 6, and the packing 8 constitute a sealed pressurized container. 13 is a nozzle provided through the lid 6, and 14 is a pressure adjustment weight placed on the nozzle 13 to keep the pressure inside the pot 4 constant. Reference numeral 15 denotes a temperature sensing device that penetrates the heating element 3 and comes into contact with the bottom surface of the pot 4, which senses the temperature of the pot 4 and controls the supply of electricity to the heating element 3.

Next, the operation in the above configuration will be explained.

When the heating element 3 starts to be energized, the temperature of the food in the pot 4 increases, steam is generated, and the pressure in the pot 4 increases. Due to this pressure increase, the lid 6 is lifted, and the engaging part 7 of the lid 6 is moved to the holding part 9 of the packing 8.
However, the upper end of the upper extending portion 10 comes into contact with the inner surface of the lid 6, and the lower end of the lower extending portion 11 comes into contact with the inner surface of the pot 4, so that airtightness between the pot 4 and the lid 6 is obtained. . Further, the pressure inside the pot 4 is kept constant by the pressure adjusting weight 14, and cooking progresses. When cooking is completed and heating of the pot 4 by the heating element 3 is stopped, the temperature of the pot 4 decreases and the pressure inside the pot 4 also decreases.
When the pressure inside the pot 4 decreases to below atmospheric pressure, the lid 6 closes.
descends, and the holding part 9 of the packing 8 is strongly clamped between the engaging part 5 of the pot 4 and the engaging part 7 of the lid 6. but,
Since the protruding portions 12 are formed on the upper and lower surfaces of the holding portion 9 of the packing 8, the contact area is small and even if strongly pressed, the suction force is small. Therefore, when the weight 14 is removed and the pressure inside the pot 4 is returned to atmospheric pressure, the adsorption phenomenon between the holding part 9 of the packing 8 and the engaging parts 5 and 7 is eliminated, and the horizontal rotation of the lid 6 is prevented by a small force. Do it with
Opening operation becomes easier.

In the above embodiment, the protruding parts 12 were formed on both the upper and lower surfaces of the holding part 9, but they may be formed on only one of them, or they may be long in the circumferential direction as shown in FIG. good.

As described above, according to the present invention, the bottomed cylindrical pot and the lid covering the upper opening of the pot are provided with a bayonet-shaped engagement portion that connects the two by horizontal rotation of the lid, and the pot and the pot are connected together. A ring-shaped packing having a T-shaped cross section and having a horizontal holding part, an upper extending part, and a lower extending part is interposed between the lids to form a sealed pressurized container. A protrusion is provided on at least one of the upper and lower surfaces of the holding part, and when the pressure inside the pot is rising, the upper and lower extending parts of the packing come into contact with the lid and the inner surface of the pot. The space between the pot and the lid is sealed, and the horizontal holding part of the packing also comes into close contact with the lid and the pot, but in the present invention, a protruding part is provided on at least one of the top and bottom surfaces of the horizontal holding part of the packing. Therefore, when the pressure inside the pot decreases after cooking is finished, the adhesion force between the packing and the lid and pot can be reduced, and as a result, the horizontal rotation of the lid after cooking can be done with a small amount of force. This has the excellent effect of making the lid opening operation extremely easy.

[Brief explanation of the drawing]

Fig. 1 is a sectional view of a pressure cooker showing an embodiment of the present invention, Fig. 2 is a perspective view of the packing of the pressure cooker, and Figs. 3 and 4 show main parts of the pressure cooker. , Figure 3 is a cross-sectional view at high pressure, Figure 4 is a cross-sectional view at high pressure.
The figure is a sectional view at low pressure, and FIG. 5 is a perspective view of the packing of a pressure cooker showing another embodiment of the present invention. 4... Pot, 5... Engaging part, 6... Lid, 7... Engaging part, 8... Packing, 9... Holding part, 12...
...Protrusion part.

Claims (1)

[Claims] 1. A cylindrical pot with a bottom and a lid covering the upper opening of the pot are provided with a bayonet-shaped engagement portion that connects the two by horizontal rotation of the lid, and a horizontal holding portion is provided between the pot and the lid. and a ring-shaped packing having a T-shaped cross section and having an upwardly extending portion and a downwardly extending portion to constitute a sealed pressurized container, and at least one of the upper surface and the lower surface of the horizontal holding portion of the packing. A pressure cooker with a discontinuous protrusion.