JPS6115767Y2 - - Google Patents

Description

[Detailed description of the invention] This invention relates to pressure cookers such as pressure cookers and pressure cookers, and the airtightness inside the cooker is maintained only when the lid and the cooker body are securely engaged using a bayonet engagement method. , relates to a safety device that increases internal pressure.

Next, the present invention will be explained with reference to an embodiment shown in the drawings.

In Fig. 1, 1 is the lid, 2 is the cooker body, 1
Reference characters a and 2a are engagement pieces formed on the inner circumferential edge of the lid 1 and the upper outer circumferential edge of the cooking device main body 2, respectively, according to the bayonet engagement method.

Reference numeral 3 denotes a packing that is held by the engaging piece 1a of the lid 1 when the lid 1 and the cooking device main body 2 are not bayonet engaged, and maintains airtightness by increasing the internal pressure of the cooking device after the lid 1 and the cooking device main body 2 are engaged.

4 and 5 are a valve device and an engagement plate that constitute the safety device according to the present invention.

Thus, the valve device 4 attached to the lid 1 is
As shown in the figure, an upper cylindrical body 4a and a lower cylindrical body 4b are screwed onto the front and back surfaces of the lid 1 through packings 6 and 7, respectively, and a valve seat opening 4a is provided on the upper wall of the upper cylindrical body 4a. ₁ , a plurality of through holes 4b ₁ are provided in the peripheral wall of the lower cylindrical body 4b, and a through hole 4b ₂ is provided in the lower wall.

Reference numeral 8 denotes an operating rod, which is internally movable up and down within the upper and lower cylinders 4a and 4b which are screwed together, and is mounted between its upper end surface and the inner wall of the upper cylinder 4a. It is urged downward by a spring 10.

Therefore, the small-diameter rod portion 8a, which is provided to protrude downward from the operating rod 8, protrudes to the outside from the through hole _4b1 of the lower cylinder 4b.

Reference numeral 9 denotes a valve body made of an elastic material such as rubber, which is fitted onto the upper end of the operating rod 8 and opens and closes _the valve seat opening 4a ₁ .
is biased to open.

Further, as shown in FIG. 1, the engagement plate 5 is attached to the upper part of the inner circumferential wall of the cooking device main body 2 (by a rivet, etc.), and has a long side along the inner circumferential wall of the main body 2 and is bent into an approximately inverted L-shape in cross section. As shown in FIG. 2, the upper surface of the arm portion 5a on the short side that protrudes into the cooking device main body 2 has a tapered surface 5 in the long side direction.
A ₁ and flat surface 5a ₂ are continuously formed.

Thus, the flat surface _5a2 is in the position where the bayonet engagement is established (not shown, but the position where the handles of the lid and the cooker body are completely overlapped), and the tapered surface 5a2 is
The mounting position of the engaging plate 5 is set so that _a1 is within a certain range before establishment.

Therefore, when bayonetly engaging the lid 1 with the cooking device main body 2, as shown in FIG. For operation, the small diameter rod portion 8a of the operating rod 8 of the valve device 4 moves to the right while sliding on the tapered surface _5a1 of the arm portion 5a.

Therefore, when bayonet engagement is established,
The small diameter rod portion 8a rides on the flat surface _5a2 of the arm portion 5a, pushes up the operating rod 8 against the spring 10, and the valve seat opening _4a1 of the upper cylinder body 4a is closed by the valve body 9. , communication with outside air is cut off, and the inside of the cooker is kept airtight.

If bayonet engagement is not established,
As shown in FIG. 2, the small diameter rod portion 8a is located on the tapered surface _5a1 of the arm portion 5a, and although the operating rod 8 has risen slightly, the valve body 9 has not yet closed the valve seat opening _4a1 . The steam pressure inside the cooking device flows out into the atmosphere through the through holes 4b ₁ and 4b ₂ through the valve seat opening 4a ₁ , and the pressure inside the cooking device does not increase.

Therefore, if steam is seen to flow out from the valve device 4 other than the pressure regulating valve (not shown), it can be recognized that the bayonet engagement of the lid 1 has not been established, so that steam can be prevented from flowing out. By further rotating the lid 1 in the closing direction until it stops, the handle is completely overlapped with the handle of the cooking device main body 2, and the inside of the cooking device can be kept airtight.

Further, when cooking is completed and the lid is rotated in the opening direction to open the lid, the valve device 4 moves to the left as shown in FIG. The valve seat opening 4a ₁ is opened by transitioning from the flat surface 5a ₂ of the 5a to the tapered surface 5a ₁ , and the steam pressure inside the cooker is released into the atmosphere from the through holes 4b ₁ and 4b ₂ , so that the lid cannot be opened. It also functions for time safety.

Note that a plurality of through holes 4 are formed in the lower cylinder body 4b of the valve device 4.
The purpose of providing _b1 is to prevent the above-mentioned effects from being blocked by bean cake etc.

As described above, the safety device of the present invention maintains the airtightness inside the cooker only after the bayonet engagement is established when the lid is closed, and when the lid is incompletely engaged, the steam pressure inside the cooker is reduced to the atmosphere. This structure prevents the lid from flying off due to incompletely closing the lid, and the valve device maintains airtightness and allows communication to the atmosphere even when the lid is opened by horizontal rotation of the lid. Since this can be done automatically through manual operation, it has the advantage of being extremely easy to use.

[Brief explanation of the drawing]

FIG. 1 is a longitudinal sectional view showing the main parts of a pressure cooker equipped with a safety device for a valve body, and FIG. 2 is a sectional view of the safety device taken along the line - in FIG. 1...Lid, 2...Cooker body, 4...Valve device,
4a ₁ ... Valve seat opening, 4b ₁ , 4b ₂ ... Through hole, 5 ...
Engagement plate, 5a... Arm portion, 5a ₁ ... Tapered surface, 5
a ₂ ... Flat surface, 8... Operating rod, 9... Valve body, 10
……spring.

Claims (1)

[Scope of utility model registration request] A pressure cooker in which a lid and a cooker body are bayonetly engaged, the valve device comprising a valve device attached to the lid and an engagement plate attached to an upper inner wall of the cooker body that cooperates with the valve device, the valve device comprising: Valve seat opening on top wall,
A cylindrical body having a plurality of through holes in a lower circumferential wall and a through hole in a lower wall, an operating rod that is housed in the cylindrical body and in which a valve body for opening and closing the valve seat opening is fitted, and the operating rod that opens and closes the valve seat opening. The engagement plate has a substantially inverted L-shaped cross section, and the upper surface of the arm protruding into the cooker body has a tapered surface that is high in the direction of closing the lid, and a flat surface that continues to the tapered surface. A safety device for a pressure cooker, characterized by comprising a support surface.