JP6495746B2 - Pressure fryer - Google Patents

Description

  The present invention relates to a pressure fryer that heats cooking oil in a state where an oil tank containing cooking oil is sealed with a lid and performs cooking under pressure.

  The pressure fryer has an oil tank that opens on the top surface and can accommodate cooking oil, a heating means such as a pulse combustor that heats cooking oil in the oil tank, and a lid that can open and close the opening of the oil tank. Heating cooking oil with a heating means in a state where the oil tank is hermetically sealed by the body enables cooking of the food under pressure (for example, see Patent Document 1). The lid includes a lid body capable of closing the opening of the oil tank, and an arm in which a handle shaft for supporting the lid body is screwed into a female screw portion held inside, and a rear end of the arm is disposed on the rear side of the oil tank. And is attached in a state of being biased to the open side by a torsion coil spring provided on the rotation shaft. A packing that contacts the opening when the oil tank is closed is provided on the backside outer periphery of the lid body, and the handle provided on the arm is rotated after the arm is tilted forward by the operation portion provided at the front end of the arm. Thus, the handle shaft is screwed down to lower the lid body, the lid body is pressed against the opening, and the gap between the lid body and the oil tank is sealed with packing.

JP 2011-244942 A

  Since such a pressure fryer is installed in a kitchen of a restaurant chain store, it is desirable that various operations such as opening and closing can be performed regardless of the operator. However, since the inside of the oil tank becomes high pressure, it is necessary to firmly press the lid body against the oil tank for the purpose of preventing leakage of cooking oil and the like, and in order to stably feed the handle shaft to the screw, It is also necessary to ensure a long axial distance. Therefore, there is a problem that it is difficult for a powerless woman to open and close.

  Therefore, an object of the present invention is to provide a pressure fryer capable of firmly pressing a lid body against an oil tank even by a weak woman or the like.

In order to achieve the above object, the invention according to claim 1 is an oil tank supported by a housing and having an upper surface opened to accommodate cooking oil, a heating means for heating cooking oil in the oil tank, and the oil tank. An arm that is connected to a horizontal rotation shaft installed in the housing behind the door and is rotatable between a lying position that crosses the top of the opening in the front-rear direction and a standing position that retracts backward from the top of the opening. And a handle shaft provided with a handle on the upper end of the arm at the fall position, and the arm at the fall position. A lid body that is orthogonally connected to the lower end of the handle shaft, moves together with the handle shaft by screw feed of the handle shaft by the handle, and closes the opening by lowering. A force flyer,
The female screw portion is divided into a first female screw portion that is fixed in the arm and a second female screw portion that is adjacent to the first female screw portion and is not fixed in the arm. On the opposing surfaces of the female screw portion and the second female screw portion, meshing portions that mesh with each other in both forward and reverse rotation directions are provided in a state having predetermined play in the rotation direction. Features.
According to a second aspect of the present invention, in the configuration of the first aspect, any one of the engagement portion of the first female screw portion and the engagement portion of the second female screw portion protrudes concentrically with the rotation center. A square engagement protrusion is provided, and the other is a pair of engagement protrusions positioned on the outside of a pair of opposing side surfaces of the engagement protrusion.

According to the first aspect of the present invention, since the force does not act on the second female screw portion at the initial stage of the rotation of the handle shaft, the force required in the initial stage of the rotation operation that has been required the most force can be reduced. Can do. After passing through this initial stage, the first and second female threaded portions are integrated by meshing the meshing portions. However, the handle shaft can be rotated without applying a strong force due to the inertia generated in the handle shaft. can do. Further, after the initial stage has elapsed, the axial distance of the male screw portion of the handle shaft can be secured long by the coupling of the first and second female screw portions in the rotational direction, so that the handle shaft can be screwed stably. Therefore, even a powerless woman or the like can firmly press the lid against the oil tank.
According to the second aspect of the present invention, in addition to the effect of the first aspect, the meshing portions of both the female screw portions are a square meshing projection and a pair of meshing projections positioned on the outside thereof. Can be easily engaged and play can be easily set.

It is a perspective view of a pressure fryer. It is a top view of a pressure fryer. It is a center longitudinal cross-sectional view of a pressure fryer (a lid body is an upper limit position). It is an upper part enlarged view of a pressure fryer (a lid body is a minimum position). It is explanatory drawing of a lid | cover main body, (A) shows a plane, (B) shows a side surface, respectively. It is an AA line expanded sectional view of FIG. It is the C section enlarged view of FIG. FIG. 6 is an enlarged sectional view taken along line BB in FIG. 5. It is a longitudinal cross-sectional view of the cover lift of a connection pin part. It is the perspective view which looked at the lid body from the bottom. It is a perspective view of a pressure safety pin. It is explanatory drawing of the handle shaft containing an internal thread part, (A) is a perspective view, (B) shows a cross section, respectively. It is explanatory drawing of the meshing part of an up-and-down internal thread part. It is a perspective view of an arm and a handle shaft. It is a perspective view of an arm side lift. It is explanatory drawing of a locking mechanism, (A) shows a blockade restriction state, (B) shows a blockade permission state, respectively. It is a fragmentary perspective view which shows the latching state of a flange part and a pressure safety pin (a part of an arm and a handle shaft, an arm side lift is abbreviate | omitted).

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
1 to 3 are explanatory views showing an example of a pressure fryer, FIG. 1 is a perspective view, FIG. 2 is a plan view, and FIG. 3 is a central longitudinal sectional view. The pressure fryer 1 has a plan view in the center of a square box-shaped housing 2 comprising a frame 3 as a framework and a panel (not shown) (not shown) shown on the outside thereof. A rectangular oil tank 5 is installed with the upper end opening 6 protruding upward from the upper panel 4 so that cooking oil stored in the oil tank 5 can be heated by a pulse combustor 7 as a heating means. It is. The top panel 4 is provided with a lid 8 that can open and close the opening 6 of the oil tank 5. 9, 9... Are casters provided at the four corners of the lower surface of the housing.

  The pulse combustor 7 is provided on the front inner surface of the oil tank 5 and combusts a mixed gas of fuel gas and combustion air, and combustion exhaust from the combustion chamber 10 is discharged to the inner surface of the oil tank 5. And a tail pipe 11 that circulates along. A combustion chamber 13 in an air chamber 12 provided on the front outer surface of the oil tank 5 is connected to the combustion chamber 10. Combustion air is connected to the mixing chamber 13 from a fan 14 in the housing 2 via a pipe. And a fuel gas is supplied from a gas conduit 16 having a flasher 15 having a solenoid valve.

  The downstream side of the tail pipe 11 is connected to the left and right exhaust pipes 17 and 17 through the air chamber 12, and is further led into the rising portion 19 installed behind the housing 2 through the decoupler 18 and the like, so that the combustion exhaust Can be discharged from the exhaust tube 20. The rising portion 19 and the upper part of the oil tank 5 are connected by two steam exhaust pipes 21 and 22, and one steam exhaust pipe 21 includes a constant pressure valve 23 so that the pressure in the oil tank 5 is equal to or higher than a predetermined value during cooking. The pressure in the oil tank 5 is kept constant by allowing the pressure to escape into the rising portion 19 when the pressure increases. The other steam discharge pipe 22 includes an opening valve 24 and opens the opening valve 24 immediately before the end of cooking, thereby releasing the pressure in the oil tank 5 into the rising portion 19 and increasing the pressure in the oil tank 5 to normal pressure. Reduce. The rising portion 19 has an oil separator that separates oil and the like from the steam introduced therein, and discharges the steam separated from the oil from the exhaust port 25 on the upper surface.

On the other hand, an oil tank 27 connected to the bottom of the oil tank 5 by an oil drain pipe 26 is provided in the lower part of the oil tank 5 in the housing 2, and cooking oil filtered by a filter 28 provided in the oil tank 27 is returned by a pump 29. By returning the oil tank 5 through the pipe 30, the cooking oil can be filtered.
31 is a burner controller provided in the lower part of the side surface of the housing 2, and the burner controller 31 is connected to an electromagnetic valve of the flasher 15 and a temperature sensor (not shown) provided in the oil tank 5. On the basis of the temperature detection signal from, the air-fuel mixture in the combustion chamber 10 is opened and closed by opening and closing the electromagnetic valve of the flasher 15 so that the oil temperature in the oil tank 5 is maintained at the cooking temperature (for example, 180 ° C. to 182 ° C.). ON / OFF control is performed to intermittently perform combustion. In addition, an operation panel 33 having operation buttons, a display unit, and the like is provided on the upper front side of the housing 2, and a fly controller 32 that sets a cooking mode, a heat retention mode, a cooking temperature, and the like and inputs an instruction to the burner controller 31 is provided. It has been.

The lid body 8 includes a rectangular tube-shaped arm 34 and an aluminum lid body 35 that is connected to the arm 34 and can be fitted onto the opening 6 of the oil tank 5. A handle shaft 36 having a cross-shaped handle 37 at the upper end is screwed into the longitudinal center of the arm 34, and the upper surface center of the lid main body 35 is connected to the lower end of the handle shaft 36. Here, the rear end of the arm 34 is rotatably connected by a left and right rotation shaft 38 provided behind the oil tank 5, so that the lid body 8 is moved from the lying position shown by a solid line in FIGS. 3 can move up and down to the upright position indicated by a two-dot chain line.
First, as shown in FIGS. 5 and 6, the lid body 35 has a quadrangular shape in a plan view that is long in the front-rear direction (the left side of FIG. 5 is assumed to be the front, and the vertical direction is assumed to be a horizontal state). And a tapered portion 40 formed around the rectangular flat portion 39 and gradually descending toward the outer periphery. Two circular upper and lower guide plates 42 and 43 are fixed to the circular concave portion 41 formed at the center of the flat portion 39 by four bolts 44, 44.

As shown in FIG. 7, a disc-shaped ball receiving tray 46 as a ball receiving member having a flange 47 provided around the lower outer periphery is fitted into the concave portion 45 provided in the center of the lower guide plate 43. . The upper guide plate 42 has a ring shape in which the ball receiving tray 46 is fitted in the center, and a stopper 48 that covers the flange 47 from above is provided on the inner periphery to prevent the ball receiving tray 46 from coming off. Yes. However, the ball receiving tray 46 is assembled with a slight play between the upper and lower guide plates 42 and 43, and the ball receiving tray 46 can be finely moved and rotated in all radial directions in plan view in the assembled state. It has become.
Further, in the center of the upper surface of the ball receiving tray 46, a tapering shape in which the outer diameter is larger than an exposed portion of a steel ball 93 to be described later, the diameter is reduced toward the bottom side, and the inner diameter is smaller than the exposed portion. A receiving concave portion 49 is formed which is composed of a first concave portion 50 and a concave spherical second concave portion 51 which is continuously located at the center of the first concave portion 50. In the assembled state, the upper surface of the ball receiving tray 46 and the upper surface of the upper guide plate 42 are flush with the flat portion 39.

  Further, a mounting groove 52 communicating with the circular recess 41 is formed in the front-rear direction centered on the circular recess 41 at the center in the left-right direction of the flat portion 39. A pair of lid lifts 53, 53 are fixed to the front and rear ends of the mounting groove 52 across the circular recess 41 by two bolts 54, 54 penetrating the lid main body 35 from the back as shown in FIG. . In each lid lift 53, a pair of connecting pins 55, 55 having a large diameter at the end on the side of the circular recess 41 is slidably penetrated in the front-rear direction. As shown in FIG. 9, the connecting pins 55, 55 pass through a fixing plate 56 as a fixing member at the end protruding from the lid lift 53 on the side opposite to the circular recess 41, and screw a nut 57. The coil springs 58 are urged to synchronize with each other by a coil spring 58 as an urging means externally mounted behind the large diameter portion in the lid lift 53. The connecting pin 55 is positioned above the flat portion 39 in the attached state of the lid lift 53. Further, the rear end of a rod-shaped lever lock 59 as a lock member is fixed to the front side of the front lid lift 53 with bolts 60 and 60, and the front end protrudes forward from the lid body 35. A front end portion 59a of the lever lock 59 is bent in an L shape downward from the flat portion 39, and a locking convex portion 61 protruding rearward is formed on the rear surface of the lower end.

On the other hand, as shown in FIG. 10, a cover portion 62 that covers the outer periphery of the upper end of the opening 6 in the closed state of the oil tank 5 is formed on the periphery of the lid main body 35. In addition, the back surface of the lid body 35 has an outer shape that is slightly smaller than the cover portion 62 and circulates like the cover portion 62, and circular portions 65 positioned at the center of the cover body 35. A projecting portion 63 comprising radial ribs 66, 66... Radially extending from the circular portion 65 and connected to the circumferential rib 64 is projected at a height lower than the covering portion 62. A fitting groove 67 is formed between the protrusion 63 and the covering part 62 over the entire circumference, and the outer periphery of the metal film body 68 covering the back surface of the lid body 35 is formed in the fitting groove 67. While being fixed by screws 69, 69,..., A packing 70 is fitted over the entire circumference. On the lower edge of the cover portion 62, a pressing portion 71 is formed that is locked to the lower surface of the packing 70 to prevent the packing 70 from coming off.
The film body 68 has a shallow taper shape including a flat surface portion 72 at the center and an inclined surface portion 72a that inclines in a direction approaching the back surface side of the lid main body 35 from the flat surface portion 72 toward the outer peripheral side. A reinforcing plate 73, which is a metal plate, is attached on the upper surface.

  Therefore, the film body 68 can be changed between a raised position where the reinforcing plate 73 contacts the protruding portion 63 and a lowered position where the reinforcing plate 73 is separated from the protruding portion 63. A through hole 74 is formed in the vertical direction in the front portion of the circular recess 41 in the lid main body 35, and a pressure safety pin 75 as a shaft member having a large diameter portion 76 formed at the lower end is accommodated in the through hole 74. Thus, the upper end passes through the upper and lower guide plates 42 and 43. As shown in FIG. 11, a chamfered portion 77 is formed on the side surface of the pressure safety pin 75, and the chamfered portion 77 is fitted by fitting with a through-hole having the same shape formed in the upper and lower guide plates 42 and 43. Can be moved up and down in the through hole 74 in a state where the rotation is restricted by the phase in the front-rear direction. On the opposite side of the chamfered portion 77 at the upper end of the pressure safety pin 75, an inclined surface 78 is formed as an inclined portion that is inclined downward toward the left outer side.

A coil spring 79 as an urging means is wound on the upper side of the large diameter portion 76 of the pressure safety pin 75 so that the pressure safety pin 75 protrudes to the back side of the lid main body 35 as shown by a two-dot chain line in FIG. The large diameter portion 76 is brought into contact with the reinforcing plate 73 by urging. Therefore, the film body 68 is normally urged to the lowered position where the reinforcing plate 73 is separated from the protruding portion 63 of the lid main body 35, and the upper end of the pressure safety pin 75 at this time does not protrude from the upper surface of the upper guide plate 42. It has become.
Further, a tray 80 extending in the left-right direction and tilting downward to the right when the lid body 35 is raised is screwed to the rear surface of the cover portion 62 on the rear side of the lid body 35. The cylinder 81 is connected.

  Next, a counterweight 82 having a U-shaped cross section is accommodated inside the arm 34, and the handle shaft 36 penetrates the arm 34 orthogonally with the counterweight 82 and is a male screw provided at an intermediate portion. The portion 83 is screwed into the female screw portion 84 housed inside the arm 34. As shown in FIGS. 4 and 12, the female screw portion 84 includes an upper female screw portion 84A as a first female screw portion fixed by a bolt (not shown) in the counterweight 82, and an arm located below the upper female screw portion 84A. 34, and is divided into a lower female screw portion 84B as a second female screw portion that is not fixed in the inner portion 34. As shown in FIG. 13, a square upper meshing protrusion 85 </ b> A is formed on the lower surface of the upper female thread portion 84 </ b> A as a meshing portion concentric with the shaft center. On the other hand, a pair of lower meshing projections 85B and 85B are formed on the upper surface of the lower female thread portion 84B as meshing portions located on the outer sides of a pair of opposing side surfaces of the upper meshing projection 85A. The lower meshing protrusion 85B can mesh with each other in either the forward or reverse rotational direction. However, a predetermined play is formed in the rotational direction between the upper meshing projection 85A and the lower meshing projection 85B, and there is a slight gap in the vertical direction between the upper female screw portion 84A and the lower female screw portion 84B. It is screwed into the male threaded portion 83 with leaving (for example, 1.25 mm or less), and grease is stored in the gap. 4, 86 is a joint that is bolted together with the upper female thread portion 84A on the upper side of the arm 34, 87 is a lock nut that is screwed into the joint 86 to prevent the handle shaft 36 from being removed, and 88 is an aluminum cap that covers the joint 86. is there.

  In addition, a cylindrical ball retainer 89 is assembled from below to a lower end portion 36a formed to have a large diameter by the handle shaft 36 by means of a pin 90 orthogonal to the axis, and is formed on the lower surface of the lower end portion 36a. A steel ball 93 is held between the upper concave portion 91 and a spherical receiving hole 92 formed at the center of the ball retainer 89 in a state where the lower portion slightly exposed from the lower half is exposed. A slight gap for storing grease is formed between the lower surface of the lower end portion 36a and the inner upper surface of the ball presser 89 so that the steel ball 93 can be rotated. On the outer periphery of the lower end of the ball retainer 89, a gear-shaped flange portion 94 is formed in which a plurality of notches 95, 95,.

Further, an arm side lift 96 as a connecting member is provided at the lower end portion 36 a of the handle shaft 36. As shown in FIGS. 4, 14, and 15, the arm side lift 96 is a cylindrical body that penetrates the handle shaft 36 and covers the outer periphery of the lower end portion 36 a including the ball retainer 89. A locking portion 97 that locks from above is formed, and a large-diameter connecting portion 98 that covers the upper and outer sides of the flange portion 94 of the ball presser 89 is formed at the lower end.
The connecting portion 98 has a circular cap shape whose opening at the lower end is larger in diameter than the upper and lower guide plates 42 and 43, and fitting portions 99 and 99 that fit into the mounting grooves 52 of the lid main body 35 are formed at point-symmetric positions. In addition, a pair of insertion holes 100 and 100 into which the connecting pins 55 and 55 of the lid lift 53 can be inserted are respectively formed.

  The arm-side lift 96 is located in the arm 34 with the upper side of the connecting portion 98 passing through the long hole 101 provided on the lower surface of the arm 34. The long hole 101 has two chamfered left and right sides. A flange 102 having the same shape as that of the long hole 101 is extended to the arm-side lift 96. That is, when the chamfering of the flange 102 is matched with the chamfering of the long hole 101, the arm-side lift 96 can be inserted into the arm 34 together with the flange 102, and the arm-side lift 96 is rotated 90 ° in the inserted state. By shifting the phase of chamfering between the long hole 101 and the long hole 101, the flange 102 can be engaged with the arm 34 and the arm side lift 96 can be prevented from coming off downward. Since the fitting portion 99 and the insertion hole 100 are in phase with the chamfering of the flange 102, the fitting portion 99 and the insertion hole 100 are positioned in the front-rear direction along the arm 34 when the arm-side lift 96 is prevented from coming off. Will do.

  On the other hand, at the front end of the arm 34, as shown in FIG. 16, a pair of left and right triangular operation plates 103, 103 as an operation unit having a gripping rod 104 on the outer side of the lower end and a lock rod 105 on the inner side thereof, It is connected so as to be swingable in the front-rear direction around a connecting shaft 106 provided in the arm 34. On the lower surface of the arm 34 between the operation plates 103, 103, an inverted U-shaped holding plate 108 that supports a support shaft 107 parallel to the connecting shaft 106, and a vertical front cover positioned below the support shaft 107 109 and an inclined regulating plate 110 located behind the front cover 109 are respectively installed. A pair of torsion springs 111, 111 having one end abutting against the holding plate 108 and the other end held between the front cover 109 and the regulating plate 110 are externally mounted on both ends of the support shaft 107. 103, the upper plate 112 provided vertically at the upper end of the regulating plate 110 abuts the rear plate 108a of the holding plate 108, and the line connecting the lock rod 105 and the connecting shaft 106 is orthogonal to the arm 34. Energizing position. A notch 113 is formed in the center of the rear plate 108 a in the left-right direction of the holding plate 108, and a locking recess 114 is formed in front of the notch 113 in the upper plate 112. A lever pressing spring 115 is provided between the torsion springs 111 at the intermediate portion of the support shaft 107.

The arm 34 and the lid main body 35 formed in this way are arranged such that the arm-side lift 96 at the lower end of the handle shaft 36 is positioned between the lid lifts 53 and 53 of the lid main body 35 and the connecting pin 55 of the lid lift 53 is connected. , 55 are respectively inserted into the insertion holes 100, 100 of the connecting portion 98, the lid body 35 is connected to the lower end of the handle shaft 36 in a suspended state via the lid lifts 53, 53 and the arm side lift 96. In this suspended state, as described above, the arm-side lift 96 is secured to the arm 34 by the flange 102, so that the arm-side lift 96 suspends the lid main body 34 even if the handle shaft 36 is broken. Lowering support is maintained.
The exposed portion of the steel ball 93 provided on the handle shaft 36 in a connected state with the lid main body 35 is fitted into the second recess 51 of the receiving recess 49 of the ball receiving tray 46. At this time, even if there is a misalignment between the steel ball 93 and the second recess 51, the steel ball 93 comes into contact with the first recess 50, so that the ball tray 46 slightly moves on the lower guide plate 43 and the misalignment occurs. The steel ball 93 is securely fitted into the second recess 51. The flange 94 of the ball retainer 89 is located above the upper guide plate 42 at a position where the notches 95, 95... And the pressure safety pin 75 are concentric.

At this time, the front end of the lever lock 59 passes through the notch 113 of the rear plate 108 a of the holding plate 108 and protrudes forward of the regulating plate 110. The lever pressing spring 115 is in contact with the upper surface of the tip end portion 59a of the lever lock 59 and urges the tip end portion 59a downward. The locking projection 61 of the distal end portion 59a is positioned in front of the locking recess 114 of the restriction plate 110 only when the lid 35 is in the lower limit position with respect to the arm 34.
On the other hand, as shown in FIGS. 1 and 2, a pair of left and right connecting plates 116 and 116 are orthogonally connected to the rear end of the arm 34, and the lower ends of the connecting plates 116 and 116 are located behind the oil tank 5. The rotary shaft 38 is rotatably connected to the upper ends of a pair of left and right shaft support plates 117 and 117 erected on the upper panel 4. The connecting plate 116 and the rotation shaft 38 are integrally fixed in the rotation direction. A pair of torsion coil springs 118 are externally mounted on the rotary shaft 38 so that the winding direction and both end positions are mirror-symmetrical, and the lower ends adjacent to each other at the center of the torsion coil springs 118 are located behind the shaft support plates 117 and 117. The upper ends located on the left and right outer sides are engaged with the lower surface of the arm 34, and the arm 34 is rotationally biased toward the open side of the oil tank 5 while being engaged with the inner side of the engagement bar 119 connecting the ends. Yes.

  Note that the lid body 8 is moved 87 ° rearward as indicated by a two-dot chain line from a lying position of 0 ° indicated by a solid line in FIG. 3 by a stopper (not shown) provided between each connecting plate 116 and the shaft support plate 117. The rotation is restricted at the rotated standing position. The standing position is a position slightly tilted forward from 90 ° in the vertical direction, but the center of gravity G of the lid 8 is behind the axis O1 of the rotation shaft 38, that is, vertically passing through the axis O1 of the rotation shaft 38. It is set to be located behind the imaginary line L in the direction. Therefore, even when the lid body 8 is in a forward inclined posture of 87 °, the standing position is maintained.

At the standing position of the lid 8, the oil received by the tray 80 is collected in the discharge cylinder 81 and sent to the rising portion 19 via a feed pipe (not shown).
On the other hand, as shown in FIG. 16, a pair of left and right locking plates 120, 120 as locking portions to which the lock rod 105 can be locked when the oil tank 5 is closed by the lid main body 35 protrude from the front surface of the oil tank 5. It is installed. Each locking plate 120 is formed with a receiving groove 121 opening in the front-rear direction. In each locking plate 120, an upper inclined surface 120a and a lower inclined surface 121a are formed on the upper surface and the upper inner surface of the receiving groove 121, respectively.

  In the pressure fryer 1 configured as described above, when pressure cooking is performed, the lid body 8 is closed in a state where the oil tank 5 is filled with cooking oil and contains ingredients. That is, when the arm 34 is rotated forward while gripping the gripping rod 104 from the front side of the housing 2 and swinging the operation plates 103, 103 outward, the lid body 35 also follows and rotates forward, and the oil tank 5 It moves to above the opening 6. At this time, the lid 8 in the upright position is inclined forward from 90 ° as described above, and the gripping rod 104 is provided at the front end of the operation plate 103 protruding forward from the arm 34. A person can easily grip the gripping rod 104 and close the lid body 8 without leaning over the oil tank 5 greatly.

  Thereafter, when the operation plate 103 is pushed into the inner position, the lock rod 105 is engaged with the receiving groove 121 of the engagement plate 120, and the lid body 8 is held at the lying position where the oil tank 5 is closed. At this time, even if the lock rod 105 is not sufficiently engaged with the receiving groove 121, the upper inclined inner surface 121 a is formed on the upper inner surface of the receiving groove 121. In combination with the biasing to the lock rod 105, the lock rod 105 is securely locked to the back (rear end) of the receiving groove 121. Even if the operation plate 103 is not sufficiently pulled out, the lock rod 105 is guided to the outside by contacting the upper inclined surface 120 a of the engagement plate 120, and the lock rod 105 is engaged with the receiving groove 121. Can do.

Here, when the arm 34 is laid down with the lid body 35 in the lower limit position with respect to the arm 34, as shown in FIG. 16 (A), the distal end portion 59a of the lever lock 59 lowered with the lid body 35 is provided. Since the lower surface is in contact with and locked to the upper end of the upper plate portion 112 of the restricting plate 110, the restricting plate 110 is pressed down from above and the pulling out of the operation plate 103 to the front is restricted. Therefore, the lock bar 105 contacts the upper inclined surface 120a of the locking plate 120, and the lid 8 cannot be closed. Even if the operation plate 103 is forcibly pulled forward against the pressing of the lever lock 59, the locking projection 61 of the tip 59a is locked to the locking recess 114 of the upper plate 112, so The drawer of the operation plate 103 toward the front is restricted. Even when the lid main body 35 is at an intermediate position higher than the lower limit position, the locking projection 61 is positioned in front of the locking recess 114, so that the operation plate 103 is prevented from being pulled out, and the lid 8 Cannot be blocked. Therefore, a procedure is established in which the lid body 35 is always laid down in a state where it is in the upper limit position with respect to the arm 34.
At the upper limit position of the lid body 35, as shown in FIGS. 16B and 3, the tip 59a of the lever lock 59 that is lifted together with the lid body 35 is located above the upper plate portion 112. The operation plate 103 can be pulled out and the arm 34 can be laid down, and the lock rod 105 can be engaged with the receiving groove 121. In this state, the lid main body 35 is held horizontally with the packing 70 in a non-contact state above the opening 6.

  When the handle 37 is rotated clockwise from here and the handle shaft 36 is rotated in the screwing direction into the female screw portion 84, the handle shaft 36 is screwed only into the upper female screw portion 84A that is initially fixed in the arm 34. It is. Thereafter, when the lower meshing protrusion 85B of the lower female thread portion 84B rotated following the handle shaft 36 contacts the upper meshing protrusion 85A of the upper female thread portion 84A, the handle shaft 36 is integrated in the rotational direction. Screwed into the screw portion 84A and the lower female screw portion 84B. As described above, by being screwed only into the upper female thread portion 84A at the initial stage of rotation, the force required at the initial stage of rotation can be reduced. After the initial rotation, the upper female screw portion 84A and the lower female screw portion 84B mesh with each other. However, since the inertia acts on the handle shaft 36, the rotation operation can be continued without applying much force. .

When the handle shaft 36 is screwed in this way, as shown in FIG. 4, the horizontal lid body 35 moves in parallel downward, so that the entire circumference of the packing 70 is simultaneously pressed against the opening 6 to seal the oil tank 5. At the lower limit position of the lid main body 35, the latching convex portion 61 of the lever lock 59 that is lowered at the same time is latched by the latching concave portion 114 of the restricting plate 110 and restricts the operation plate 103 from being pulled forward. The opening of the body 8 is locked.
When the lid main body 35 is lowered, the lid main body 35 is lifted by the arm side lift of the handle shaft 36 even if the handle shaft 36 is inclined from the vertical posture or is relatively displaced with respect to the arm 34. 96 and lid lifts 53 and 53 of the lid body 35 are connected to the lower end of the handle shaft 36 in a suspended state, so that the lid body 35 is maintained in a horizontal position regardless of the inclination of the handle shaft 36 and the packing 70 One-sided contact is less likely to occur. Therefore, the adhesion between the lid main body 35 and the oil tank 5 can be ensured by absorbing the inclination and the positional deviation.

  Further, even if the cover body 35 and the handle shaft 36 are misaligned due to wear of the packing 70 or an assembly error, the ball receiving tray 46 of the cover body 35 that receives the steel ball 93 provided at the lower end of the handle shaft 36 is horizontally oriented. Therefore, the misalignment can be absorbed and the screw feed force of the handle shaft 36 can be efficiently transmitted to the lid body 35. Therefore, the sealing performance between the lid main body 35 and the oil tank 5 can be sufficiently secured. In particular, since the receiving recess 49 of the ball receiving tray 46 is formed of a tapered first recess 50 and a concave second recess 51, the steel ball 93 is exposed even when the handle shaft 36 is inclined. The portion always abuts annularly, and the lid body 35 can be efficiently pressed against the opening 6.

  After the oil tank 5 is closed in this manner, when the predetermined cooking mode is selected by the fly controller 32 and the operation switch of the operation panel 33 is turned on, the burner controller 31 rotates the fan 14 for a predetermined time and supplies air, then the combustion chamber The pulsed combustor 7 is operated by intermittently burning the mixed gas within the chamber 10. That is, the spark plug 10a (FIG. 3) provided in the combustion chamber 10 ignites the mixed gas, explodes and burns in the combustion chamber 10, and the combustion exhaust is removed from the tailpipe by the pressure increase in the combustion chamber 10 accompanying the combustion. 11 is forcibly discharged to 11 and the operation (ON / OFF operation) of sucking fuel gas and combustion air into the combustion chamber 10 which becomes negative pressure due to the discharge of the combustion exhaust is repeated or input adjustment by proportional control To do.

When the pressure in the oil tank 5 is increased by this pressure cooking, the film body 68 separated downward from the protrusion 63 of the lid body 35 by the pressure safety pin 75 urged downward by the coil spring 79 is attached to the coil spring 79. It moves upward against the force and pushes up the pressure safety pin 75. Then, as shown in FIG. 17, the upper end of the pressure safety pin 75 protrudes upward from the upper guide plate 42 of the lid body 35 and engages with the notch 95 of the flange portion 94 of the ball retainer 89. Thus, the rotation of the handle shaft 36 is restricted. Therefore, opening of the lid body 8 by the operation of the handle 37 during pressure cooking is prevented.
At this time, if the notch 95 of the flange portion 94 is not positioned directly above the pressure safety pin 75, the handle shaft 36 can be rotated by the handle 37, but the notch 95 is rotated by the flange portion 94 and the pressure notch 95 is pressure safe. When the position directly above the pin 75 is reached, the pressure safety pin 75 pushed up by the film body 68 engages the upper end with the notch 95, so that the rotation of the handle shaft 36 is immediately restricted.

When the pressure cooking is completed, the operator reversely rotates the handle 37 and feeds the handle shaft 36 upward to release the pressure on the lid main body 35. Then, since it is screwed only into the upper female thread portion 84A, the rotation operation can be performed with a light force in the initial stage. After that, even if the lower meshing protrusion 85B of the lower female thread portion 84B meshes with the upper meshing protrusion 85A of the upper female thread portion 84A and is integrated in the rotational direction, the rotation operation is continued as it is due to inertia and the lid body 35 is moved to the upper limit position. Can be moved.
When the lid main body 35 moves to the upper limit position in this way, as shown in FIG. 16 (B), the locking projection 61 of the lever lock 59 that is lifted at the same time is separated upward from the locking recess 114 of the restriction plate 110. The lock rod 105 can be removed from the locking plate 120 by grasping the grip rod 104 and pulling the operation plate 103 forward. When the arm 34 is rotated as it is, the lid body 35 also follows and rotates upward, and the lid body 8 moves to a standing position where the oil tank 5 is opened.

  Thus, according to the pressure fryer 1 of the said form, the lid main body 35 is made into the upper limit position which becomes non-contact with the opening 6 of the oil tank 5, and the lower limit position where the packing 70 contact | abuts to the opening 6 and obstruct | occludes the oil tank 5. Since the parallel movement is possible, the one-sided contact of the packing 70 accompanying the opening and closing of the lid body 8 is prevented. Further, since the lid main body 35 moves in parallel toward the opening 6, the entire packing 70 can be pressed against the end face of the opening 6 uniformly. Therefore, damage to the packing 70 is less likely to occur, the thickness of the end face of the opening 6 can be reduced, and the end face shape can be made sharp with no chamfered portion. Thus, the sealing property between the lid body 8 and the oil tank 5 can be secured.

In particular, here, between the lid main body 35 and the operation plate 103, a lock mechanism (the lever lock 59 and the lever lock 59 and the lever plate 59) that restricts the operation of the operation plate 103 at the position of the lid main body 35 other than the upper limit position. By providing the locking recess 114), the locking operation to the locking plate 120 cannot be performed except at the upper limit position of the lid body 35, and the locking operation can be performed only at the upper limit position. Therefore, the arm 34 is not laid down at the position of the lid main body 35 other than the upper limit position, and it is possible to more reliably prevent the packing 70 from hitting the piece.
The locking mechanism is provided on the lid main body 35 and moves up and down integrally, and is provided at the lever lock 59 provided with the locking projection 61 and the operation plate 103 at the position of the lid main body 35 other than the upper limit position. The locking mechanism 61 can be easily formed by using the upper and lower positions of the lid main body 35 because the locking protrusion 61 is locked to form the locking recess 114 that prevents the locking operation of the operation plate 103.

Note that the structure of the lock mechanism is not limited to the above form, and can be changed as appropriate, for example, by providing a plurality of lever locks, or by reversing the positions of the locking projections and the locking recesses.
In addition, for the invention of translating the lid body between the upper limit position and the lower limit position, the female screw part is divided into two parts, the suspension of the lid body is supported by the arm side lift, the misalignment correction by the ball tray and the steel ball, the lever The configuration related to locking by locking is not a requirement.

  Further, according to the pressure fryer 1 of the above form, the lid body 35 is provided with the pressure safety pin 75 penetrating the lid body 35 on the rotation locus of the notch 95 accompanying the rotation of the handle shaft 36, and the back side of the lid body 35. During the cooking in which the metal film body 68 that can be shifted in the thickness direction of the lid body 8 and the coil spring 79 that biases the pressure safety pin 75 toward the film body 68 are provided, and the opening 6 is closed by the lid body 35. When the pressure in the oil tank 5 increases, the film body 68 shifts upward to push up the pressure safety pin 75 against the urging of the coil spring 79, and the upper end of the pressure safety pin 75 is notched in the flange portion 94. By being engaged with 95, rotation of the handle shaft 36 is regulated by the pressure safety pin 75 engaged with the flange portion 94 during pressure cooking. Therefore, with a simple configuration, the rotation operation of the handle 37 during pressure cooking can be reliably regulated to prevent the lid body 8 from being opened.

In particular, here, the flange portion 94 is provided with a plurality of notches 95, 95,... At equal intervals in the circumferential direction, so that the notches 95 are displaced with respect to the pressure safety pin 75 during pressure cooking. Even when the pressure safety pin 75 is not locked to the notch 95, when the handle shaft 36 is rotated in the direction to open the lid body 35 and the notch 95 reaches the position of the pressure safety pin 75, the pressure safety pin 75 It can be locked and further rotation of the handle shaft 36 can be restricted.
In addition, since an inclined surface 78 that allows rotation of the flange portion 94 accompanying rotation of the handle shaft 36 in the screwing direction is provided at the upper end of the pressure safety pin 75, when the lid body 35 is to be further pressed against the opening 6. The handle shaft 36 is allowed to rotate, and the usability is improved.

Further, since the film body 68 is formed in a taper shape having the flat flat surface portion 72 as a bottom, a force along the axial direction is applied to the pressure safety pin 75 by the flat surface portion 72 while allowing the transition. Therefore, the smooth operation of the pressure safety pin 75 can be ensured.
In particular, since the reinforcing plate 73 is attached to the upper surface of the flat surface portion 72, the film body 68 can be prevented from being damaged.
Since the outer peripheral edge of the film body 68 is screwed in the fitting groove 67 and supported from below by the packing 70, the film body 68 is sealed even if the screw 69 is loosened due to the transition of the film body 68. 70 can be held.
On the other hand, since the protruding portion 63 including the circumferential rib 64 and the radiating rib 66 is formed on the back surface of the lid main body 35, the lid main body 35 is reinforced and excessive displacement of the film body 68 can be restricted.
Further, since the flange portion 94 is formed in a gear shape as a plurality of notches 95 that open to the periphery of the flange portion 94, the pressure safety pin 75 can be provided even if the handle shaft 36 is inclined. It can be securely locked to the notch 95.

The number of notches in the flange portion may be increased or decreased. Moreover, as a to-be-latched part, not only a notch but it can also be set as a through-hole or a recessed part formed in the lower surface.
The shape of the shaft member can also be changed as appropriate, and can be a square shaft other than the circular shaft, and the urging means can be a plate spring, a disc spring, or the like other than the coil spring.
In addition, as for the protruding portion, the number of the circumferential ribs and the radiating ribs can be increased or decreased, and one of the circumferential ribs and the radiating ribs can be omitted, or a plurality of protrusions can be provided in place of the two ribs to contact the film body. You can also The film body may also be attached separately from the packing, omitting the reinforcing plate.
Further, regarding the invention for restricting the handle operation during cooking by locking the shaft member to the flange portion, the lid body is moved in parallel, the female screw portion is divided into two parts, the suspension support of the lid body by the arm side lift, the ball tray The configuration related to misalignment correction with steel balls and locking with lever locks is not a requirement.

Further, according to the pressure fryer 1 of the above-described form, the female screw portion 84 includes the upper female screw portion 84A fixed in the arm 34, and the lower female not fixed in the arm 34 adjacent to the upper female screw portion 84A. The upper meshing protrusion 85A and the lower meshing protrusion 85B that mesh with each other in both the forward and reverse rotation directions are separated from each other on the opposing surfaces of the upper female screw part 84A and the lower female screw part 84B. By providing each with a predetermined play with respect to the direction, no force acts on the lower female screw portion 84B at the initial stage of rotation of the handle shaft 36. The power required for the stage can be reduced. After this initial stage, the upper and lower female screw portions 84A and 84B are integrated by meshing the upper and lower meshing projections 85A and 85B. However, due to the inertia generated in the handle shaft 36, the handle can be handled without applying a strong force. The shaft 36 can be rotated. Further, after the initial stage has elapsed, the axial distance of the male screw portion 83 can be secured long by the coupling of the upper and lower female screw portions 84A and 84B in the rotational direction, so that the handle shaft 36 can be screwed stably. Therefore, even a powerless woman or the like can firmly press the lid 8 against the oil tank 5.
In particular, here, the meshing portion of the upper female screw portion 84A is a square upper meshing projection 85A projecting concentrically with the rotation center, and the meshing portion of the lower female screw portion 84B is opposed to the upper meshing projection 85A. By using the pair of lower meshing protrusions 85B and 85B located outside the pair of side surfaces, a reliable meshing can be obtained and play can be easily set.

In the above embodiment, the upper female screw portion is fixed in the arm and the lower female screw portion is screwed to the handle shaft, but it may be turned upside down. In addition, the structure of the meshing portion is such that the square upper meshing projection and the pair of lower meshing projections are turned upside down, or the projections formed in the circumferential direction on the opposing surfaces of both female threaded portions are meshed with each other. You can also.
Furthermore, for the invention that divides the female screw part into two parts, the structure that restricts the handle operation during cooking by locking the shaft member to the flange part, the parallel movement of the lid body, the suspension support of the lid body by the arm side lift, The configuration related to the misalignment correction by the ball tray and the steel ball and the lock by the lever lock is not a requirement.

In addition, according to the pressure fryer 1 of the above-described embodiment, the ball receiving tray 49 having the steel ball 93 at the lower end portion of the handle shaft 36 and the receiving recess 49 into which the exposed portion of the steel ball 93 is fitted on the upper surface of the lid main body 35. 46 is held so as to be movable in the horizontal direction, even if the relative angle between the handle shaft 36 and the lid main body 35 is deviated, the deviation can be absorbed, and the advancing force of the handle shaft 36 can be efficiently absorbed. 35. Therefore, the sealing performance between the lid body 8 and the oil tank 5 can be sufficiently secured.
In particular, here, since the receiving recess 49 is formed of the tapered first recess 50 and the concave spherical second recess 51, even when the handle shaft 36 is inclined, the steel ball 93 and the receiving recess 49 The lid body 35 can be efficiently pressed against the opening 6 even if the relative angle of the handle shaft 36 is inclined. In addition, since the force acting on the ball receiving tray 46 when the handle shaft 36 is screwed can be dispersed as compared with the case of abutting at one point, the wear of the steel balls 93 and the ball receiving tray 46 can be prevented, Maintenance frequency can be reduced.

In the above embodiment, the steel ball is provided on the handle shaft side and the ball tray is provided on the lid body side, but they may be provided on the opposite sides.
In addition, regarding the invention for correcting misalignment between the ball and the ball receiving member, the structure in which the female screw part is divided into two parts, the structure in which the shaft member is locked to the flange part to control the handle operation during cooking, the lid body The configuration related to the parallel movement, the suspension support of the lid body by the arm side lift, and the configuration related to the lock by the lever lock are not requirements.

On the other hand, according to the pressure fryer 1 of the above-described form, the lid main body 35 is connected to the lower end of the cylindrical arm side lift 96 that is loosely inserted into the handle shaft 36 and locked to the lower end portion 36a. Since the lid body 35 is supported by being suspended from the handle shaft 36, the lid body 35 can be allowed to swing with respect to the handle shaft 36. Therefore, even if a deviation occurs in the positional relationship between the oil tank 5 and the lid main body 35, the lid main body 35 swings and is pressed against the opening 6 while absorbing the deviation, thereby ensuring adhesion with the oil tank 5. be able to.
In particular, here, the connection between the arm-side lift 96 and the lid main body 35 is performed by connecting pins 55 and 55 arranged at point-symmetrical positions around the arm-side lift 96 on the upper surface of the lid main body 35 and the arm-side lift 96. The arm-side lift 96 and the lid main body 35 can be easily connected to each other by using the insertion holes 100 and 100 into which the connecting pins 55 and 55 are inserted.
Further, the connecting pins 55 and 55 are projected and urged toward the arm side lift 96 by the coil spring 58, and the connecting pins 55 and 55 at the respective point-symmetrical positions are connected by the fixing plate 56. By moving the pins 55 and 55 away from the arm-side lift 96, the connecting pins 55 and 55 can be removed from the insertion holes 100 and 100 without the jig, and the lid body 35 and the arm 34 can be easily separated. . Therefore, maintenance of the handle shaft 36 and the lid main body 35 can be easily performed. Since the fixing plate 56 is positioned below the arm 34, the lid main body 35 is not separated by an inadvertent operation.
Further, the upper part of the arm-side lift 96 is positioned in the arm 34 through the through hole (long hole 101) provided in the lower surface of the arm 34, and is engaged with the arm 34 on the outer periphery of the upper part. Since the flange 102 for preventing the arm-side lift 96 from coming off is formed, even if the handle shaft 36 is broken, the suspension support of the lid body 35 is maintained by the arm-side lift 96 that is prevented from coming off from the arm 34. The

In addition, the shape of a connection member can be changed suitably, and a large diameter connection part can also be abbreviate | omitted if a steel ball and a ball receiving tray are not provided.
Further, the pair of lid lifts and connecting pins is not limited to a point-symmetric arrangement, and three or more sets of concentric circles may be arranged, and the connecting pins can be increased or decreased. Therefore, the position and number of the insertion holes of the connection member are also changed according to the connection pins. Further, the connecting pin can be provided on the protrusion protruding from the upper surface of the lid body without using a lid lift separate from the lid body.
And about the invention which concerns on suspension support of a lid body, the composition which aims at core misalignment correction with a ball and a ball bearing member, the structure which divides a female screw part into two, the shaft member is locked to a flange part, and cooking is in progress The configuration that restricts the operation of the handle, the configuration related to the parallel movement of the lid body, and the configuration related to the lock by the lever lock are not requirements.

According to the pressure fryer 1 of the above embodiment, the lid main body 35 is engaged with the operation plate 103 at the lower limit position where the lid main body 35 is pressed against the opening 6 to restrict the operation of the operation plate 103. By providing the lever lock 59 that releases the operation restriction of the operation plate 103 at a position other than the lower limit position, the operation of the operation plate 103 during pressure cooking can be reliably restricted.
In particular, here, since the L-shaped tip portion 59a of the lever lock 59 is locked to the restriction plate 110 of the operation plate 103, the operation of pulling the operation plate 103 forward is restricted. Easy to do.
In addition, the front inclined lower inclined surface 121a that guides the lock rod 105 to the inner side of the receiving groove 121 is formed on the inner surface of the upper side of the receiving groove 121 of the locking plate 120, so that the arm 34 is locked when the arm 34 is going to rise. The bar 105 is guided to the back of the receiving groove 121 by the lower inclined surface 121a, and the opening of the lid body 35 is restricted even if the lock bar 105 is not sufficiently locked.
Furthermore, a locking protrusion 61 that locks to a locking recess 114 provided in the restriction plate 110 is provided at the distal end 59 a of the lever lock 59, and the locking protrusion 61 is locked to the locking recess 114. Since the operation of pulling out the operation plate 103 is restricted, the operation restriction state is more reliably maintained.

Note that the shapes of the operation portion and the locking portion can be appropriately changed, and the lock rod may be supported by a pair of links instead of the operation plate, or the locking plate may be formed by a single block body. The inclined surfaces of the locking plate and the receiving groove can be omitted.
In addition, regarding the invention for regulating the operation by the lock member, the configuration relating to the suspension support of the lid body, the configuration for correcting the misalignment between the ball and the ball receiving member, the configuration for dividing the female screw portion into two, the shaft member as the flange The configuration for restricting the handle operation during cooking by being locked to the portion and the configuration relating to the parallel movement of the lid body are not requirements.

  In addition, other configurations of the pressure fryer can be changed as appropriate in common with each invention. For example, the heating means is not limited to the pulse combustor but can be replaced with a burner, a heater, or the like. The handle at the upper end of the handle shaft may also have a Y shape, a single character shape, or a ring shape in plan view. Moreover, each invention is employable even if it is a pressure fryer which does not have a single oil tank but is provided in pairs on the left and right.

  1 .... pressure fryer, 2 .... housing, 3 .... frame, 4 .... top panel, 5 .... oil tank, 6 .... opening, 7 .... pulse combustor, 8 .... lid, 10 .... combustion chamber , 11 Tail pipe, 31 Burner controller, 32 Fly controller, 33 Operation panel 34 Arm 35 Cover body 36 Handle shaft 37 Handle 38 Rotating shaft, 46 .. Ball tray, 49 .. Recessed recess, 50 .. First recess, 51 .. Second recess, 53 .. Lid lift, 55 .. Connecting pin, 56 .. Fixing plate, 58. Coil spring, 59.. Lever lock, 61.. Locking convex part, 63 ... Projection part, 64 ... Circumferential rib, 66 ... Radiation rib, 67 ... Fitting groove, 68 ... Film body, 70 Packing, 72 ... Flat surface, 73 ... Reinforcing plate, 75 ... Pressure safety pin , 78 .. Inclined surface, 83 .. Male thread part, 84.. Female thread part, 84 A .. Upper female thread part, 84 B .. Lower female thread part, 85 A .. Upper meshing protrusion, 85 B. , 89 .. Ball retainer, 93 .. Steel ball, 94 .. Flange part, 95 .. Notch, 96.. Arm side lift, 97 ... Locking part, 8. , 103 .. Operation plate, 105... Lock rod, 110 .. Restriction plate, 114 .. Locking recess, 120 .. Locking plate, 121.

Claims (2)

An oil tank that is supported by the housing and has an upper surface opened to contain cooking oil;
Heating means for heating cooking oil in the oil tank;
It is connected to a horizontal rotating shaft installed in the housing behind the oil tank, and can be rotated between a lying position that crosses above the opening in the front-rear direction and a standing position that retreats from above the opening to the rear. Arm and
A handle shaft provided with a handle at an end that is an upper side of the arm in the lying position, penetrating the arm orthogonally and screwing into a female screw portion inside the arm;
A lid body that is orthogonally connected to the end of the handle shaft that is below the arm in the lying position, moves together with the handle shaft by screw feed of the handle shaft by the handle, and closes the opening by descending A pressure fryer comprising:
The female screw portion is divided into a first female screw portion that is fixed in the arm and a second female screw portion that is adjacent to the first female screw portion and is not fixed in the arm. On the opposing surfaces of the female screw portion and the second female screw portion, meshing portions that mesh with each other in both forward and reverse rotation directions are provided in a state having predetermined play in the rotation direction. Features pressure fryer.   One of the meshing portion of the first female screw portion and the meshing portion of the second female screw portion is a square-shaped meshing projection that is concentric with the rotation center, and the other is the meshing projection. The pressure fryer according to claim 1, wherein the pressure fryer is a pair of meshing protrusions positioned outside a pair of side surfaces facing each other.

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