JPS6132576Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a safety device for a pressure cooker. In general, pressure cookers maintain the inside of the pot at a pressure higher than atmospheric pressure during cooking, thereby shortening cooking time and saving resources.They also make it possible to make edible rice, brown rice, etc. that would not be edible even when cooked at normal atmospheric pressure. In recent years, it has attracted attention as an effective kitchen appliance. However, while pressure cookers have the above advantages, the inside of the pot is under high pressure, so there may be cases where the lid is not securely fixed to the pot body, or the pressure inside the pot is not sufficiently reduced to normal pressure after cooking. If the above locking and fixed state is released, the lid will pop up momentarily or the cooked food inside the pot will scatter, which can occur if the pressure cooker is used incorrectly. had.

Therefore, various safety devices have been proposed to solve this problem, and the applicant has also proposed
In Application No. 3375, unless the pressure inside the pot is reduced, the lid cannot be rotated from the fully engaged state of the locking claws, and therefore cannot be opened, and the locking claws are completely engaged with each other. We are proposing a safety device that will prevent the pressure inside the pot from rising if the pot is not heated.

The present invention is a further improvement of the invention related to the above-mentioned application, and its purpose is to create a pressure cooker that can improve safety reliability and operability when using a pressure cooker. It is intended to provide a safety device.

Below, the present invention will be explained in detail about the embodiment shown in the drawings. In the drawings, 1 is a pot body having a main handle 2 and an auxiliary handle 3; 4
1 is a lid body having a main handle 5 corresponding to the main handle 2 of the pot body 1, and on the pot body 1 side, a part of a flange 6 is provided on the mouth edge of the pot body 1 to protrude outward from the mouth edge. Notches are made at appropriate intervals in the circumferential direction to form 7. That is, a plurality of outward locking pawls 8 are formed with the remaining notched portion of the flange 6, and the peripheral edge thereof is once flattened outward (flange-shaped) on the lid body 4 side. ) On the overhanging 9, the end edge side of the portion 9 that overhangs outward is bent inward into a U-shape and squeezed, and an inward annular groove 10 is formed in the peripheral edge. 11 is formed by cutting out a part of the inward flange-shaped portion forming the groove 10 at appropriate intervals in the circumferential direction. In other words, a plurality of inward locking claws 12 (the same number as the outward locking claws 8) are formed by the inward flange-like portions of the cutout remaining portions, and are formed inwardly. A pot body 1 and a lid body 4 configured as follows.
This means that the handle 5 of the lid body 4 is positioned at the chain line position in FIG. At a position where the inward locking claw 12 of the lid body 4 does not overlap the outward locking claw 8 of the pot body 1 in the circumferential direction,
In other words, the lid 4 is fitted onto the pot body 1 at the position where both the locking claws 12 and 8 fit into the notch 7 and the locking claw 12, respectively, and the lid 4 is placed relative to the pot body 1. When the main handles 2 and 5 overlap each other in the vertical position, the outer locking claw 8 on the side of the pot body 1 will lock the lid 4
The inward locking claws 12 on the sides are completely overlappingly engaged, and the cross-sectional shape is U-shaped, made of an elastic material such as silicone rubber that has been fitted in advance into the groove 10 inside the lid body 4. The annular packing 15 seals between the lower surface 4a of the peripheral edge of the lid 4 and the upper surface 1a of the brim-shaped portion of the mouth of the pot body 1. Therefore, safety devices are implemented for the lid 4 and the pot body 1 as follows.

That is, 16 is an on-off valve that is formed by forming a flat surface at a suitable place on the top surface of the lid body 4, and then drilling a hole 17 therein and attaching it to the hole 17. Cylindrical valve body 18 serving as a seat
and the cylindrical inner circumferential surface 1 of this valve body 18
8b, and the spool portion 2
The upper part of the valve body 18 is made up of a poppet valve 20 that protrudes above the upper end of the valve body 18, and the valve body 18 is fixed to the hole 17 of the lid body 4 by caulking or the like at the upper part. . The poppet valve 20 has a spool portion 20b that protrudes downward from the lower end of the valve body 18, and the valve seat 18a.
A flange-shaped valve head 2 to keep the inside of the pot airtight by keeping the inside of the pot airtight.
It is equipped with 0a. Valve head 20a of poppet valve 20
In this case, a packing 22 is attached to the part of the poppet valve 20 that abuts against the valve seat 18a, and when the pressure inside the pot body 1 increases, the poppet valve 20 can be closed even by a slight pressure increase. , the valve head 20a is pushed up and its packing 22 is supported to be loosely slidable up and down with respect to the valve body 18 so that it can be pressed against the valve seat 18a.

Note that this poppet valve 20 is connected to a lever 2 which will be described later.
5 and a locking protrusion 20d for fixing on the valve body 18.
The valve head 20a is formed on the upper part of the valve head 20a.
The poppet valve 20 of this embodiment is constructed by screwing it onto the lower end of the spool portion 20b.
is also equipped with a relief valve device 30 for maintaining the set pressure.

That is, the relief valve device 30 has the relief valve 30 biased to the closed position by the spring 31 against the valve seat 30a formed in the poppet valve 20.
b, and this relief valve device 30 operates when the pressure inside the pressure cooker reaches a certain pressure.
The spring constant of the spring 31 is set so that the valve 30b can be separated from the valve seat 30a and the pressure can be released.

As mentioned above, the poppet valve 20 of this embodiment has a relief valve device 30 inside it as described above.
Since the space for this relief valve 30 is also used, a ventilation passage 32 as shown below is formed. That is, this ventilation passage 32 has an outlet 32b at its upper end at a position where the spool portion 20b is always exposed above the upper end of the valve body 18, and an inlet 32b at its lower end.
a shows that when the poppet valve 20 is kept above the neutral position, the poppet valve 20 is hidden inside the valve body 18.
When left in their natural state without applying any external force (FIG. 4), they are opened outside the valve body 18, that is, at a position where the inlet 32a is exposed inside the lid 4. Next, the lever 25 connected to the poppet valve 20 of the on-off valve 16 configured as described above will be explained. The lever 25 is also pivoted by a horizontal pivot pin 36, and one end 25a of the lever 25 is formed into a forked shape and engages with the two-sided groove 26 formed at the upper end of the poppet valve 20. The lever 25
When activated, the poppet valve 20 can be displaced upward from the neutral position, and conversely,
When the poppet valve 20 is raised and activated, the lever 2
5 can be oscillated. The other end 25b of this lever 25, whose one end 25a is connected to the poppet valve 20, is bent downward at approximately 90 degrees along the lid 4. Other end 25
b can be swung toward or away from the outer surface of the pot body 1, and one side surface 37a of the lever 25 is placed at a suitable location on the outer surface of the pot body 1. A stopper 37 is protruded to serve as a locking surface 37a for the other end 25b, and a cam 38 for engaging with the other end 25b of the lever 25 is protruded from a suitable position on the outer surface of the stopper 37 than the pot body. be.

The stopper 37 is provided at a selected position in relation to the lever 25 so that the following conditions are satisfied.

That is, in the illustrated embodiment, lever 2
5 extends in the same longitudinal direction as the handle 5 on the lid body 4 side,
Since it is provided inside, the stopper 37
is provided above the handle 2 on the side of the pot body 1 and protrudes at a position closer to the right side in plan view, but in the pressure cooker of this embodiment, the concave groove 10 on the side of the lid 4 One locking pawl 12 is positioned at the end in the clockwise direction in FIG. In other words, the handle 5 is moved from the position shown by the chain line in FIG. Only during the rotation angle of around 36° that overlaps with
By rotating this, the locking claws 8 and 12 can be engaged and disengaged from each other, and the lever 2
The other end 25b of 5 is connected to the locking claw 12 of the lid 4 and the pot body 1.
In the position where the locking claws 8 of the handle 5 are released from each other, the handle 5
In the relative position where the handle 2 and the handle 2 are open (as shown by the chain line in FIG. 3), it is located on the right side of the stopper 37 and the cam 38, and both the locking claws 12 and 8 overlap each other and are completely engaged. The width of the lever 25 and the stopper 3 are adjusted so that the handles 5 and 2 are positioned on the pressure side of the stopper 37 and the cam slope 38a.
The width in plan view of 7 is set. Further, this lever 25 is set so that the rotational moment due to its own weight is within the following range. That is, when the lever 25b engages with the cam slope 35a and the poppet valve 20 is in the neutral position, the pressure inside the pressure cooker is at a constant minute pressure (for example, gauge pressure 0.02 kg/
cm ² ) In the following conditions, the poppet valve 20 is connected to the ventilation passage 3.
The inlet 32a of the poppet valve 20 is kept hidden within the valve body 18, and when the pressure inside the pressure cooker exceeds the certain minute pressure, the poppet valve 20 is raised by the pressure acting on its valve head 20a. The other end 25b of the lever 25 is set in such a range that the valve head 32a can be brought into contact with the valve seat 18a, and the other end 25b of the lever 25 is balanced as described above. When the main body 1 is in the fitted state, that is, when the locking claws 12 and 8 are fully engaged (FIG. 4), the packing 22 of the valve head 20a of the poppet valve 20
When the valve seat 18a is brought into contact with the valve seat 18a, it is located on the left side of the stopper 37 in a plan view, and is engaged with the locking surface 37a, reaching a position where the lid body 4 can be locked so that it can no longer be rotated ( When the internal pressure decreases and the poppet valve 20 is brought to the neutral position, the other end 25b of the lid lever 25
is the stopper 37 in the direction of rotation of the lid body 4.
The cam plane 38b is located outside the operating area of the cam plane 38b, and the cam plane 38b is such that the poppet valve 20 is kept in the neutral position and the locking pawls 12, 8 are fully engaged. When the handle 5 is turned counterclockwise from the assembled state, the lever 2
The other end 25a of the lever 25 engages and slides on the cam slope 38a, and the force acting on the poppet valve is removed through the one end 25a of the lever 25. 4 and is formed so as to be exposed to the outside of the valve body 18.

In addition, 25c is a balance weight attached to the lever 25, and the pressure inside the pot is adjusted to the set pressure (for example, gauge pressure).
0.02Kg/cm ² ) or more, the poppet valve 20 rises, the valve seat 18a of the valve body 18 and the valve head 20a abut each other, and one end 25b of the lever 25 touches the stopper 3.
The poppet valve 20 is positioned in the action area 7 to make the lid 4 unrotatable, and the poppet valve 20 is lowered when the cooking is finished and the fire is extinguished and the pressure in the pot falls below (for example, gauge pressure 0.02 kg/cm ² ). The lever 25 is provided so that one end 25b is located from the action area of the stopper 37 to the action area of the cam plane 38b. Note 23
is a clogging prevention cover.

Next, the operation will be described with reference to an embodiment. The lid body 4 of this invention is fitted onto the pot body 1 with the handle 5 positioned at the position shown by the chain line in FIG. When moved, rotation stopper 4
At the position where 0 is applied, the handle 5 overlaps above the handle 2, and the locking claws 12 and 8 are completely engaged with each other over the entire surface. At this time, the cam slope 38a tilts the other end 25b of the lever 25 against the weight of the poppet valve 20 and automatically guides it to the cam slope 38b.

In the state where both handles 5 and 2 are overlapped with each other as described above, the other end 25b of the lever 25 is
In plan view, the lever 25 is located on the left side of the stopper 37, and can freely tilt without being hindered by the presence of the stopper 37. Therefore, when this pressure cooker is heated, the pressure inside the cooker becomes a constant minute pressure (for example, gauge pressure 0.02Kg/
cm ² ), the poppet valve 20 of the on-off valve 16 is automatically raised and the packing 22 of the valve head 20a contacts the valve seat 18a and is closed.
One end 25a of the raised poppet valve 20
The lever 25 that has been pushed up tilts and the other end 25b engages the locking surface 37a of the stopper 37.
(Figure 4, dashed line). Therefore, when the pressure inside the pot exceeds the above-mentioned certain minute pressure, the lid of the pressure cooker can no longer be opened by turning the handle 5 due to the action of the stoppers 37 and 40. However, the safety device of this invention is limited to the steam exhaust device 5 attached to the lid body 4.
0 in the direction of the arrow to open the relief valve 30b.
When the pressure inside the pot is lowered to the above-mentioned minute pressure by pushing up, the pivoting moment of the lever 25 that loads the poppet valve 20 is set within the above-mentioned range, so the poppet is automatically opened. When the valve 20 is moved to the neutral position, the locking state of the other end 25b of the lever 25 by the stopper 37 is released, and the pressure inside the pot is sufficiently reduced so that there is no danger even if the lid 4 is opened. When the above-mentioned constant minute pressure (for example, gauge pressure 0.02 Kg/cm ² ) is reached, the handle 5 can be turned to release the engagement between the locking pawl 12 and the locking pawl 8. According to experiments, there is no danger in opening the lid 4 suddenly in this state, and when the handle 5 is turned counterclockwise to open the lid 4, the other end 25b of the lever 25
Located from the cam plane 38b to the cam slope 38a,
Since the inlet 32a of the poppet valve 20 is gradually exposed to the cam guide 38c, the residual minute pressure inside the pot automatically closes the ventilation hole 32 while the handle 5 is turned in the opening direction. When the locking claws 12 and 8 are completely disengaged, the pressure inside the pot is reduced to the same level as the outside pressure. It is.

Therefore, in the case of a pressure cooker that implements this idea,
A locking claw 12 on the lid body 4 side and a locking claw 8 on the pot body 1 side
Unless they are fully engaged, the other end 25b of the lever 25 does not act on the cam slope 38a, so the inlet 32a of the poppet valve 20 is not hidden behind the valve body, and the internal pressure cannot rise. On the other hand, once the upper and lower locking claws 5 and 2 are overlapped with each other, both locking claws 1
When comrades 2 and 8 are completely engaged, the on-off valve 16 will be automatically closed due to a slight pressure increase inside the pot.
This makes it possible to increase the internal pressure, and once the internal pressure is increased in this way, the lever 25 is interlocked to close the on-off valve 16, and the stopper 3
7a, the on-off valve 16 will no longer open unless the pressure inside the pot is lowered artificially or naturally to a certain minute pressure, that is, the lever 25 will not open. 37
Since it does not displace from the action area of a, it is not possible to open it by turning the lid body 4 artificially, and only when the pressure inside the pot drops below a certain minute pressure that is not dangerous, do you turn the lid body and open it. It can be opened. In addition, it is easy to design and manufacture the cam 38 so that the lever 25 is activated when the main body claw 8 and the lid claw 12 are almost completely engaged, so that the main body handle 2 and the lid handle 5 may accidentally overlap. Even if the main body locking claw 8 and the lid body locking claw 12 engage in a position where the lid handle 5 and the main body auxiliary handle 3 overlap, the pressure cannot be increased, so erroneous operation is completely prevented. It can be prevented.

As described above, with the safety device of this invention, danger can be reliably prevented at low cost. In the figure, numeral 55 is a safety device for preventing abnormal pressure and dry cooking using a fusible metal, and numeral 60 is a notification device that notifies when the internal pressure reaches the set pressure and when the optimum cooking time has arrived.

[Brief explanation of the drawing]

Figure 1 is a partially cutaway side view of the pressure cooker, Figure 2 is a bottom view of the lid, Figure 3 is a plan view of the pot body, and Figure 4 is a full view of the locking claws of the lid and the pot body. Fig. 5 is a longitudinal cross-sectional side view of the main parts of the safety device in the engaged state;
The figure is a plan view of the locking claws in a state where they are separated from each other. 1... Pot body, 2, 5... Handle, 4... Lid body,
8, 12... Locking claw, 10... Concave groove, 15... Packing, 16... Opening/closing valve, 17... Hole, 18...
...valve body, 18a...valve seat, 20...poppet valve, 20a...valve head, 20b...subur portion,
25...Lever, 32...Air passage, 32a...Inlet, 32b...Outlet, 35...Bracket, 36
...Fully point, 37... Stopper, 37a... Locking surface, 38... Cam, 38a... Cam slope, 3
8b...cam plane, 38c...cam guide.

Claims (1)

[Claims for Utility Model Registration] The pot body has a plurality of locking claws projecting outward from its mouth edge, and a handle protruding from its outer periphery. , a plurality of inward locking pawls are formed from the peripheral edge thereof, and a handle is protruded from the outer periphery thereof, and when the above-mentioned both handles are aligned in the upper and lower positions, the above-mentioned outward and outward locking pawls are mutually connected. When the two handles are rotated relative to each other and separated by a certain angle,
In a pressure cooker constructed in such a way that the locking claws facing inward and outward are mutually displaced and completely detached, a hole is drilled at an appropriate position on the top surface of the lid, and the following on-off valve is inserted therein. , a The on-off valve has a cylindrical valve body whose lower end surface serves as a valve seat, and a spool portion that is slidably fitted into the inner circumferential surface of the valve body so that the spool portion extends upwardly from the upper end of the valve body. and a poppet valve having a flange-shaped valve head that abuts against the valve seat, the spool portion of which protrudes downward from the lower end of the valve body, b. The spool portion of the poppet valve is provided with a ventilation passage whose outlet is always open to the outside of the lid body and whose inlet is always opened at a position inside the pot so that it is exposed outside the valve body. A valve is installed and provided at a suitable location on the outer surface of the pot body, with one side thereof serving as a cam slope for the lever described later,
A stopper that disables the rotation of the lever is protruded from the side of the pot body of the slope, and the lever, whose fulcrum is pivoted by a bearing bracket protruding from the upper surface of the lid, is mounted on the lid. Place it on top. One end of this lever is connected to the poppet valve of the opening/closing valve, and the other end is made to face the action area of the cam slope, so that at least the locking claw of the lid body is fully connected to the locking claw of the pot body. In the engaged state, the inlet of the poppet valve is in a neutral position hidden inside the valve body, and as the pressure increases, the other end of the lever is positioned in the action area of the locking surface of the stopper. When the poppet valve is brought to the neutral position, the other end of the lever is moved away from the action area of the stopper and positioned in the action area of the cam slope, thereby disabling the lid. A safety device for a pressure cooker characterized by being configured such that it can be turned and by turning the lid body, the inlet of the air passage of the poppet valve is gradually exposed, allowing communication between the inside and outside of the pot. .