JP2019013172A - Petri dish - Google Patents

Abstract

To provide a Petri dish in which a lid is engaged with a container body not only in a state where the inside of a container is tightly sealed but also in a state where air permeability is secured, and not only anaerobic but also aerobic microorganisms or bacteria are cultured.SOLUTION: A Petri dish 1 of the present invention comprises: a container body 3 which is open upward and capable of housing a housed item inside thereof; and a lid 4 which is capable of closing an opening of the container body 3, in which the container body 3 and the lid 4 put on the container body 3 are made relatively rotatable, and an engagement mechanism which allows the container body 3 and the lid 4 to be engaged is provided. The engagement mechanism is constituted such that an airtight engaging state in which the lid 4 is engaged with the container body 3 while airtightness is secured and an air permeable engaging state in which the lid 4 is engaged with the container body 3 while air permeability is secured become switchable by changing a rotating angle of the lid 4 with respect to the container body 3.SELECTED DRAWING: Figure 2A

Description

  The present invention relates to a petri dish used for culturing microorganisms, bacteria, and the like, and particularly to a stamp-type petri dish that cultivates bacteria and the like pressed against and adhered to an object.

  Conventionally, a petri dish is a container for culturing microorganisms, bacteria, and the like in a medium contained therein, and is generally formed using glass, plastic, or the like. Specifically, this petri dish is composed of a circular flat bottom container body that opens upward, and a lid that closes the opening of the container body. When culturing microorganisms and bacteria, the petri dish contains a liquid medium containing nutrient components and a solid medium obtained by solidifying the liquid medium with agar or the like.

  By the way, when the lid is not fixed to the container main body and the petri dish falls during the experiment or transportation, the lid may open and the contents may be scattered. In particular, in the case of a stamp-type petri dish, the petri dish itself is frequently carried because the solid medium housed in the petri dish is pressed against the object to be cultured. For this reason, the contents of the stamp-type petri dish easily scatter. Therefore, in the conventional petri dish, means such as a tape for fixing the container main body containing the solid medium or the liquid medium and the lid are provided. However, in general, when culturing microorganisms or bacteria, a large amount of petri dishes are handled at the same time, and it is unavoidable to manually seal each petri dish with tape, and the fixing of the lid is insufficient. It is easy to become.

Therefore, the petri dish of Patent Document 1 has proposed a method of preventing the contents from scattering by providing a fixing means for fitting and fixing the lid and the container main body more firmly.
Specifically, the petri dish disclosed in Patent Document 1 has an outer peripheral wall that rises upward along the outer edge of the container body, and an outer periphery that is formed so as to hang downward along the outer edge of the lid. And walls. The outer peripheral wall of the container main body and the outer peripheral wall of the lid body are configured to face each other by covering the container main body with a cover body, and a complementary fitting structure that meshes with the facing peripheral wall is provided. Is provided. Therefore, when the lid is fitted from above the container body, the facing peripheral walls are fitted together by the fitting structure, and the lid is fixed to the container body.

  Patent Document 2 includes a petri dish body having a bottom plate portion and a side wall portion rising from the bottom plate portion, and a lid having a top plate portion and a skirt portion that hangs down from a peripheral portion of the top plate portion. A petri dish in which a lid is put on the petri dish main body and is closed, which can be spirally rotated with respect to the petri dish main body while maintaining the closed state is disclosed. Even in the petri dish of Patent Document 2, the lid is fixed to the petri dish body in a state where the lid is spirally rotated upward with respect to the petri dish body, and the contents can be prevented from scattering.

JP-A-2005-312317 JP 2012-143157 A

In the petri dish of Patent Document 1, when the lid is fitted from above the container body, the inside of the petri dish is in a sealed state in which ventilation from the outside is blocked. That is, the petri dish container of Patent Document 1 is used for culturing while blocking external ventilation, in other words, for culturing in an anaerobic environment.
However, in the pharmaceutical field, air may be required for culturing microorganisms and bacteria, such as culturing aerobic bacteria. The petri dish disclosed in Patent Document 1 does not have a gap that allows air and moisture to enter and exit between the container body and the lid in the fixed state.

That is, the container of Patent Document 1 may be able to prevent the contents from scattering by fixing the lid and the container main body, but cannot allow air and moisture to enter and exit in the fixed state. Therefore, it is impossible to culture aerobic microorganisms and bacteria, the petri dish is limited to anaerobic bacteria and the like, and the convenience of the petri dish is not good.
On the other hand, even in the petri dish of Patent Document 2, when the lid is rotated spirally with respect to the petri dish body and the lid is locked, the lower surface of the top plate part of the lid is strongly pressed against the upper surface of the side wall part of the petri dish body, The inside of the petri dish is sealed. If the lid is rotated in the opposite direction, air can be introduced into the petri dish, but this time, the lid and the petri dish body are separated from each other, and a fixed state cannot be obtained. Therefore, the petri dish of Patent Document 2 is also difficult to culture aerobic microorganisms and bacteria as in Patent Document 1.

  The present invention has been made in view of the above-described problems, and is capable of engaging the lid with the container body in a state of ensuring air permeability as well as a state in which the inside of the container is sealed, and is anaerobic. It aims at providing the petri dish which can culture not only aerobic microorganisms and bacteria.

In order to solve the above problems, the petri dish of the present invention takes the following technical means.
That is, the petri dish of the present invention includes a container main body that is open upward and can accommodate a stored item therein, and a lid that can close the opening of the container main body, and the container main body and the container A petri dish provided with an engagement mechanism that is capable of relative rotation with a lid body that covers the main body, and is capable of engaging the container main body and the lid body, wherein the engagement mechanism is a container main body By changing the rotation angle of the lid with respect to the airtight engagement state in which the lid is engaged with the container main body while ensuring airtightness, and with respect to the container main body while ensuring air permeability The ventilation engagement state in which the lid is engaged is configured to be switchable.

Preferably, the lid body includes a horizontally flat top plate and a lid side wall hanging from the outer edge of the top plate, and the container body has a horizontally flat bottom portion, A main body side wall protruding upward from the outer edge of the bottom, and the engagement mechanism may be provided between the lid side wall and the main body side wall.
Preferably, when the lid body is put on the container body and the lid body is rotated with respect to the container body, the lid body and the container body pass through the airtight engagement state from the non-engagement state, and the ventilation It is good to set it as the structure engaged in an engagement state.

Preferably, the engagement mechanism includes a convex portion protruding in a radial direction from an outer peripheral surface of the lid side wall, and a concave portion provided in the container body, and the convex portion is It may be configured to engage with the recess.
Preferably, the concave portion opens toward the inside of the diameter and engages with the convex portion, and opens toward the inside of the diameter at a position above the first concave portion and the convex portion. A second concave portion that is engaged with the first concave portion, and the convex portion engages with the first concave portion, so that the lid body is fitted to the container body without a gap, and the lid body is provided. Is in the airtight engagement state, and the convex portion is engaged with the second recess, whereby the container body and the lid body are separated from each other in the vertical direction, and the lid body is in the airtight engagement state.

Preferably, the second concave portion is engageable with the convex portion at a position higher than the first concave portion, and the container is disposed between the first concave portion and the second concave portion. By tilting the lid relative to the main body, an inclined guide surface for guiding the convex portion in the vertical direction may be formed.
Preferably, a plurality of the convex portions are provided on the side wall of the lid with a distance in the circumferential direction, and a plurality of the concave portions are provided on the side wall of the main body with a distance in the circumferential direction. .

  Preferably, a medium is dispensed inside the container body, and the medium is used as a stamp petri dish that rises upward from the opening of the container body.

  According to the petri dish of the present invention, the lid body can be engaged with the container body in a state of ensuring air permeability as well as the inside of the container being sealed, and not only anaerobic but also aerobic microorganisms or Bacteria can be cultured.

It is a figure which shows the cover body of the petri dish of this embodiment in the state which the cover body isolate | separated from the container main body. It is a figure which shows the container main body of the petri dish of this embodiment in the state which the cover body isolate | separated from the container main body. It is a perspective view of the petri dish of this embodiment in the state where a lid body separated from a container main part. It is a perspective view of the petri dish of this embodiment by which the engagement mechanism was made into the non-engagement state. It is a perspective view of the petri dish of this embodiment by which the engagement mechanism was made into the airtight engagement state. It is the figure which expanded and showed the stopper part provided in the petri dish of this embodiment. It is the top view which showed the case where the engagement mechanism of the petri dish of this embodiment is (a) in a non-engagement state, (b) it is in an airtight engagement state, and (c) it is in a ventilation engagement state, respectively. . It is the side view which showed the case where the engagement mechanism of the petri dish of this embodiment is (a) in a non-engagement state, (b) in an airtight engagement state, and (c) in a ventilation engagement state, respectively. .

Hereinafter, embodiments of the petri dish 1 of the present invention will be described in detail with reference to the drawings.
The petri dish 1 according to the present invention is a container in which a medium 2 and the like can be accommodated, and microorganisms and bacteria can be cultured using the accommodated medium 2. The petri dish 1 of the present invention can be suitably used particularly for a stamp type petri dish 1 for culturing bacteria or the like pressed and adhered to an object. In the present embodiment, the petri dish 1 of the present invention will be described using an example of the stamp type petri dish 1.

As shown in FIG. 1A to FIG. 1B and FIG. 2A to FIG. 2C, the petri dish 1 according to the present invention is a combination of a cylindrical container body 3 and a lid 4 that are short in the axial direction. . Specifically, the lid 4 is a member having a slightly larger diameter than the container main body 3, and can be detachably engaged with the container main body 3 by being covered from above the container main body 3.
In the following description, the vertical direction in FIGS. 1A and 1B is referred to as the vertical direction when the petri dish 1 is described. In addition, with reference to a center line penetrating the center of the petri dish 1 in the vertical direction, a direction approaching or moving away from the center line on a horizontal plane is referred to as a radial direction. Further, the direction rotating clockwise around the center line in a plan view is defined as a closing direction, and the direction rotating counterclockwise is defined as an opening direction. About the direction mentioned above, it illustrates using the arrow suitably in drawing.

  The container body 3 is a container that can accommodate the medium 2 and the like necessary for culturing microorganisms and bacteria that are to be cultured. The container body 3 is formed in a bottomed cylindrical shape opened upward using a transparent or translucent synthetic resin such as polystyrene, or glass. Further, the container body 3 is formed so that the dimension (thickness) along the vertical direction is shorter than the dimension (width) along the radial direction so that the culture state inside can be easily seen. Yes.

  Specifically, the container main body 3 includes a flat bottom portion formed in a circular shape in plan view, and a main body side wall 3b formed so as to rise upward from an outer edge of the bottom portion. The main body side wall 3b is formed over the entire circumference so as to surround the bottom portion, and the container main body 3 can accommodate the culture medium 2 in the inside surrounded by the bottom portion and the main body side wall 3b. Further, a flange-like flange portion 3c is provided on the outer edge of the bottom portion so as to protrude outward in the radial direction. The upper surface of the flange portion 3c is a flat surface, and a stopper portion 5 that protrudes upward is formed on the flat upper surface of the flange portion 3c. A recess 6 of the engagement mechanism is formed.

  The lid 4 is a member that can close the opening of the container body 3. The lid 4 is formed in the shape of a covered cylinder that opens downward using the same material as the container body 3 or a transparent material. Specifically, the lid body 4 includes a top plate 4a formed in a circular shape in plan view, and a lid side wall 4b hanging from the outer edge of the top plate 4a. The top plate 4 a of the lid body 4 is a disk having a larger outer diameter than the bottom portion of the container body 3, and the lid side wall 4 b of the lid body 4 has an annular shape (tubular shape) having a diameter larger than that of the body side wall 3 b of the container body 3. Is formed. That is, in the petri dish 1 of the present embodiment, the opening of the container body 3 can be sealed with the lid body 4 by covering the container body 3 with the lid body 4 having a diameter (width dimension) larger than that of the container body 3. ing. A convex portion 7 of an engagement mechanism described later is formed on the outer peripheral surface of the lid side wall 4b.

  When culturing using the petri dish 1 described above, the lid 4 is removed from the container body 3, and the bacteria to be cultured are planted in the culture medium 2 inside the container body 3 from which the lid 4 has been removed. In the case of the stamp-type petri dish 1 according to the present embodiment, it is preferable to plant the bacteria or the like in the medium 2 by pressing the object against the medium 2. After the planting of bacteria or the like is completed, the lid body 4 is attached to the container body 3 and culturing is performed in an incubator or the like while preventing invasion of foreign substances and other germs.

By the way, as described in “Problems to be Solved by the Invention”, a conventional petri dish has a structure in which a lid is fixed to a container body so as to prevent scattering of contents.
However, such a lid fixing structure has a structure in which the inside of the container is sealed from the outside during fixing, and the inside of the container becomes an anaerobic atmosphere. Naturally, in a petri dish having such an engagement structure, aerobic bacteria and the like cannot be cultured, and the use of the petri dish (bacterial species to be cultured) is limited.

Therefore, in the petri dish 1 of the present embodiment, the engagement mechanism that engages the lid body 4 with the container body 3 is in an airtight engagement state in which the lid body 4 is engaged with the container body 3 while ensuring airtightness. A configuration is adopted in which the ventilation engagement state in which air and moisture can enter and exit inside and outside the petri dish 1 can be switched.
Specifically, the petri dish 1 of the present invention has a configuration in which the lid body 4 is rotatable with respect to the container body 3 and the engagement state of the engagement mechanism is switched by rotating the lid body 4. It has become. That is, if the lid body 4 in the non-engaged state is rotated in the closing direction, the engagement mechanism is switched from the non-engaged state to the engaged state and the airtight engagement state, and the lid body 4 is further closed. If it continues to rotate, the airtight engagement state is switched from the airtight engagement state while maintaining the engagement state. Further, if the lid body 4 in the ventilation engagement state is rotated in the opening direction, the engagement mechanism is switched from the ventilation engagement state to the airtight engagement state, and further, the lid body 4 is continuously rotated in the opening direction. The lid 4 is switched to the non-engagement state with respect to the container body 3.

That is, the above-described engagement mechanism is configured to engage the convex portion 7 formed on the lid side with the concave portion 6 formed on the container body 3 side by using the rotation of the lid body 4 with respect to the container body 3. The engagement state of the engagement mechanism described above is also switched by changing the positional relationship of the convex portion 7 with respect to the concave portion 6 (the positional relationship between the circumferential direction and the vertical direction).
Hereinafter, the convex portion 7 and the concave portion 6 constituting the engagement mechanism and the positional relationship between them will be described.

  As shown in FIG. 3, the convex part 7 is a part formed so as to protrude outward from the side wall of the lid 4 toward the outside of the diameter, and a plurality of convex parts 7 are provided at equal intervals in the circumferential direction on the surface of the lid side wall 4b. (In this embodiment, three are provided in the circumferential direction). The convex portion 7 has a shape that rises in two steps toward the outside of the diameter, and has an arcuate tip portion with a small curvature radius on the projecting end side of the hem portion 7a that swells in a gentle arc shape with a large curvature radius. 7b is combined so as to be stacked. Of the two portions (the skirt portion 7a and the tip portion 7b) that form the convex portion 7 described above, the surface of the skirt portion 7a is gently inclined with respect to the outer peripheral surface of the lid body 4, When the lid body 4 is rotated with respect to the container body 3, a guide surface 9 is provided that can smoothly guide the recess 6. Further, of the two portions forming the convex portion 7, the tip portion 7 b having a small curvature radius is fitted into the concave portion 6 of the stopper portion 5 described later, so that the lid body 4 does not rotate with respect to the container body 3. Thus, the positioning is performed.

  The concave portion 6 is a portion that engages with the convex portion 7 described above, and is formed on the inner side of the inverted L-shaped stopper portion 5 formed on the upper surface of the flange portion 3 c of the container body 3. The stopper portion 5 is formed of a side wall 5a that protrudes upward from the upper surface of the flange portion 3c, and an upper wall 5b that is bent so as to protrude radially inward from the upper end of the side wall 5a. The upper wall 5b of the stopper portion 5 is provided at a distance allowing insertion of the lid side wall 4b from the main body side wall 3b of the container main body 3 toward the outer diameter side.

In addition, the stopper part 5 and the recessed part 6 of this embodiment are formed in three places in the container main body 3 in total so that each of the three convex parts 7 mentioned above can engage.
A concave portion 6 that engages with the convex portion 7 is formed on the inner side of the side wall 5a of the stopper portion 5 described above. The recess 6 is composed of a first recess 61 and a second recess 62, and the first recess 61 and the second recess 62 are formed side by side in the circumferential direction. And the 1st recessed part 61 engages with the convex part 7 while opening toward a diameter inner side. In addition, the second recess 62 opens toward the inside of the diameter at a position above the first recess 61 and engages with the protrusion 7.

  Specifically, the first recess 61 and the second recess 62 have two ribs (ribs extending in the vertical direction) at a distance in the circumferential direction on the inner side (diameter inner side) of the side wall 5a constituting the stopper portion 5. It is obtained by forming. That is, if a rib protruding toward the inside of the diameter is formed on the side surface on the inside of the diameter of the stopper portion 5, the side surface of the stopper portion 5 adjacent to the rib becomes a recess 6 that is recessed outward from the protruding end of the rib. Thus, the 1st recessed part 61 and the 2nd recessed part 62 which were mentioned above engage with the convex part 7 using the dent formed adjacent to a rib, when a rib is formed.

  In the present embodiment, in order to form the first recess 61 and the second recess 62, two ribs of a first rib 81 and a second rib 82 are provided. Of these two ribs, the first rib 81 is located on the opening direction side as viewed from the outside of the diameter, and the second rib 82 is located on the closing direction side. Each of the first rib 81 and the second rib 82 is a portion protruding in an arc shape toward the inside of the diameter, and is formed so as to be continuous along the vertical direction. A portion recessed between the first rib 81 and the second rib 82 toward the outside of the diameter is a first recess 61, and a recess formed in a portion adjacent to the closing direction of the second rib 82. Is the second recess 62.

  The projecting height at which the first rib 81 and the second rib 82 project outward in the radial direction is such that when the lid body 4 is rotated with respect to the container body 3, the projecting ends and the projecting portions of the ribs 81 and 82, respectively. 7 is set to such a height that it slightly touches the protruding end 7a. In other words, even if the lid body 4 is rotated with respect to the container body 3, the protruding ends of the first rib 81 and the second rib 82 are only slightly in contact with the protruding end 7 a of the convex portion 7. 3, when the lid 4 is rotated slightly stronger toward the closing direction, the protruding end 7 a of the convex portion 7 gets over the protruding ends of the first rib 81 and the second rib 82, and the convex portion 7 passes through the first concave portion 6. Can be moved in the circumferential direction.

  In addition, the upper wall 5b of the stopper portion 5 described above is formed to bend so as to protrude toward the inside of the diameter, and the protruding portion 7 moves upward in the portion protruding toward the inside of the diameter. It is a restricting portion that restricts, and it is possible to prevent the protrusion 7 from being disengaged from the first recess 61 and the second recess 62. Therefore, in the “airtight engagement state” in which the convex portion 7 engages with the first concave portion 61 and the “ventilated engagement state” in which the convex portion 7 engages with the second concave portion 62, the container body 3 is covered with the lid. The body 4 is in a fixed state, and it is possible to prevent the lid body 4 from being removed from the container body 3 and the contents scattered.

As shown in FIGS. 4 and 5, an inclined guide surface 9 (slope) for guiding the convex portion 7 in the vertical direction is formed between the first concave portion 61 and the second concave portion 62 described above. The guide surface 9 is configured to switch the airtightness inside the container between the “airtight engagement state” and the “ventilation engagement state”.
The guide surface 9 is composed of an inclined surface that is inclined so as to move upward from the first concave portion 61 toward the second concave portion 62 (toward the closing direction). Can be guided in the vertical direction. That is, the second recess 62 connected to the first recess 61 via the inclined guide surface 9 is formed at a position slightly higher than the first recess 61. Therefore, in the state where the convex portion 7 is engaged with the first concave portion 61 described above, the lid body 4 is rotated with respect to the container body 3 even when the lid body 4 and the container body 3 are aligned with no gap. When the convex portion 7 is engaged with the second concave portion 62 by being moved, a gap C is formed between the lid body 4 and the container body 3 by an amount corresponding to the inclined height of the guide surface 9. Ventilation is performed inside the container.

  Therefore, in the petri dish 1 of the present embodiment, in a state where the convex portion 7 is engaged with the first concave portion 61, that is, in the “airtight engagement state”, the culture is performed in an anaerobic atmosphere with the inside of the container being airtight. It becomes possible. On the other hand, in a state where the convex portion 7 is engaged with the second concave portion 62, that is, the “venting engagement state”, it is possible to perform the culture in an aerobic atmosphere while ensuring air permeability into the container. It becomes. In both the “airtight engagement state” and the “ventilation engagement state”, the upper wall 5b of the stopper portion 5 that is bent so as to protrude toward the inside of the diameter restricts the upward movement of the convex portion 7. Is in a state of being fixed to the container body 3, and there is no fear of causing a situation in which the lid 4 is detached and the contents are scattered.

Next, the operation of the engagement mechanism will be described.
When the lid body 4 is rotated in the closing direction with respect to the container body 3 in the “non-engaged state” shown in FIGS. 4A and 5A, the projection of the lid body 4 with respect to the stopper portion 5. The part 7 comes close to the first rib 81 of the stopper part 5 while moving toward the closing direction, and the convex part 7 comes into contact with the first rib 81 first.
At this time, since the first rib 81 and the convex portion 7 are set to a height at which the protruding ends come into contact with each other, the protruding end 7a of the protruding portion 7 is in contact with the protruding end of the first rib 81 as it is. Does not move further in the closing direction.

  However, since the protruding height toward the inside of the diameter of the first rib 81 is only slightly in contact with the protruding end 7a of the protruding portion 7, if the lid body 4 is strongly rotated in the closing direction, the protruding portion 7 protruding over the protruding end of the first rib 81 and moving in the closing direction, and the circumferential position of the convex portion 7 is the same as that of the first rib 81 and the second rib as shown in FIGS. 4 (b) and 5 (b). It moves to the first recess 61 between the rib 82.

  As described above, between the first rib 81 and the second rib 82 is the first concave portion 61 that is recessed toward the radially outer side, and the convex portion 7 that has moved between the first rib 81 and the second rib 82. Is engaged with the first recess 61. That is, in the 1st recessed part 61, since the 1st rib 81 regulates the movement of the convex part 7 which goes to an opening direction, and the 2nd rib 82 regulates the movement of the convex part 7 which goes to a closing direction, it is a convex part as it is. 7 does not move in either the closing or opening direction. And in the state which this convex part 7 engaged with the 1st recessed part 61, since the clearance gap C is not formed between the container main body 3 and the cover body 4, the inside of a container will be in an airtight state, and anaerobic atmosphere It becomes possible to culture in The state where the convex portion 7 is engaged with the first concave portion 61 is the above-described “airtight engagement state”.

  On the other hand, when the lid body 4 is further rotated in the closing direction with respect to the container main body 3 in the “airtight engagement state” shown in FIG. 4B and FIG. The portion 7 moves over the second rib 82 and moves to the second recess 6. In the second recess 6, the movement of the projection 7 in the opening direction is regulated by the second rib 82, and the movement of the projection 7 in the closing direction is regulated by the side wall 5 a of the stopper 5. 7 does not move in either the closing or opening direction.

  Here, as shown in FIG. 4C and FIG. 5C, an inclined guide surface 9 capable of guiding the convex portion 7 upward is formed between the first rib 81 and the second rib 82. Has been. Therefore, when the convex portion 7 located in the first concave portion 6 is moved to the second concave portion 6, the lid body 4 moves upward by the inclination height of the guide surface 9, and the container body 3 and the lid body 4. A gap C is formed between the two. If such a gap C is provided, air permeability to the inside of the container can be ensured through the gap C, and culture in an aerobic atmosphere becomes possible. The state in which the convex portion 7 is engaged with the second concave portion 6 is the above-described “ventilation engagement state”.

  As described above, in the petri dish 1 of the present embodiment, when the lid body 4 is rotated in the closing direction with respect to the container main body 3, the engagement state of the engagement mechanism is such that the lid body 4 moves upward with respect to the container main body 3. From the disengageable “non-engaged state”, the air permeability to the inside of the container is increased through the “air-tight engaged state” in which the lid 4 is fixed to the container main body 3 while the inside of the container is air-tight. It changes to the “air-engagement state” in which the lid body 4 is fixed to the container body 3 while ensuring.

  When the lid 4 is rotated in the opening direction with respect to the container body 3, the engagement state changes in the reverse order to that described above. In other words, the engagement state of the engagement mechanism is changed from the “air-engagement state” in which the lid 4 is fixed to the container body 3 while ensuring the air permeability to the inside of the container, while the inside of the container is kept airtight. Through the “airtight engagement state” in which the lid body 4 is fixed to the container body 3, the lid body 4 changes to the “non-engagement state” in which the lid body 4 can be separated upward from the container body 3.

Therefore, in the petri dish 1 of the present embodiment, the lid 4 can be engaged with the container main body 3 not only in a state where the inside of the container is sealed but also in a state where air permeability is ensured. Aerobic microorganisms and bacteria can be cultured.
In particular, in the embodiment disclosed this time, matters that are not explicitly disclosed, for example, operating conditions and operating conditions, various parameters, dimensions, weights, volumes, and the like of a component deviate from a range that a person skilled in the art normally performs. Instead, values that can be easily assumed by those skilled in the art are employed.

DESCRIPTION OF SYMBOLS 1 Petri dish 2 Medium 3 Container main body 3b Main body side wall 3c Container main body collar 4 Lid 4a Lid top 4b Lid side wall 5 Stopper 5a Stopper side wall 5b Stopper upper wall 6 Recess 61 1st recessed part 62 2nd recessed part 7 Convex part 7a Bottom part of convex part 7b Tip end part of convex part 81 1st rib 82 2nd rib 9 Guide surface C Clearance

Claims (8)

A container main body that opens upward and can accommodate an object; and a lid that can close the opening of the container main body; and the container main body and a lid that covers the container main body. A petri dish provided with an engagement mechanism that is capable of relative rotation and is capable of engaging the container body and the lid,
The engagement mechanism changes the rotation angle of the lid body with respect to the container body, thereby ensuring airtightness while ensuring airtightness and ensuring the air permeability. However, the petri dish is configured to be switchable between a ventilation engagement state in which a lid is engaged with the container main body. The lid includes a top plate that is flat in the horizontal direction, and a lid side wall that hangs down from the outer edge of the top plate.
The container body includes a horizontally flat bottom part, and a body side wall protruding upward from an outer edge of the bottom part,
The petri dish according to claim 1, wherein the engagement mechanism is provided between the lid side wall and the main body side wall. The engagement mechanism is
When the lid body is put on the container body and the lid body is rotated with respect to the container body, the lid body and the container body are engaged in the ventilation engagement state through the airtight engagement state from the non-engagement state. The petri dish according to claim 1 or 2, wherein the petri dish is configured to be combined. The engagement mechanism is
The engagement mechanism has a convex portion projecting radially from the outer peripheral surface of the lid side wall, and a concave portion provided in the container body,
The petri dish according to claim 2 or 3, wherein the convex portion is configured to engage with the concave portion. The concave portion opens toward the inside of the diameter and engages with the convex portion, and the second concave portion opens toward the inside of the diameter at a position above the first concave portion and engages with the convex portion. It is provided with recesses side by side in the circumferential direction,
By engaging a convex portion with the first concave portion, the lid body is fitted to the container body without a gap, and the lid body is in the airtight engagement state,
The petri dish according to claim 4, wherein the convex body is engaged with the second concave portion, whereby the container main body and the lid body are separated from each other in a vertical direction so that the lid body is in the airtight engagement state. The second recess is engageable with the projection at a position higher than the first recess,
The petri dish according to claim 5, wherein an inclined guide surface that guides the convex portion in the vertical direction is formed between the first concave portion and the second concave portion. A plurality of the convex portions are provided at a distance in the circumferential direction on the lid side wall,
The petri dish according to claim 5 or 6, wherein a plurality of the concave portions are provided in the main body at a distance in a circumferential direction.   The petri dish according to any one of claims 1 to 7, wherein a medium is dispensed inside the container main body, and the medium is used as a stamp petri dish raised upward from the opening of the container main body.