JP3191992U - Science teaching materials that use batteries - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a science teaching material capable of selectively accommodating a plurality of batteries and minimizing shape and dimensions. SOLUTION: A housing main body 22 has a first end surface 26 facing a first terminal of a large battery, a second end surface 27 facing the second terminal, and a connection terminal TH hanging along the first end surface 26. It is configured to include a first holding portion 28 that can be held, and a second holding portion 29 that can hold the connection terminal TH that hangs down along the second end surface. The auxiliary adapter SP housed in the housing body 22 and holding a small battery is configured to have a terminal holding portion 32 capable of holding the first connection terminal TH. [Selection diagram] Fig. 3

Description

  The present invention relates to a science teaching material that can use batteries of different sizes, and more particularly to a science teaching material characterized by a battery housing structure.

  Now that various electric devices are widely spread all over the world, life without electricity is almost unthinkable. Therefore, in Japan, science experiments are generally conducted to deepen understanding of electricity from the lower grades of elementary school.

  For science experiments for lower grades, for example, (1) When a miniature bulb is connected between the positive terminal and negative terminal of the battery, the light bulb glows. (2) At this time, the connection between the positive terminal and the negative terminal is reversed. Even if the light bulb shines in the same way, (3) Connect a switch between the battery and the light bulb and operate the switch to turn the light bulb on or off. (4) Connect the tester terminal between the battery and the light bulb. When two testers are connected and each tester terminal is brought into contact with various materials, the contents of the experiment such as the presence of a material that turns on the light bulb and a material that does not light up can be considered.

Noto 3005180 JP 2013-218939 A

  In general, it is considered that such science teaching materials use single batteries or AA batteries of different sizes. Therefore, a battery box configuration that can handle any battery is desired.

  Here, various configurations have been proposed in order to meet such demands (Patent Documents 1 and 2). However, each battery box is not a minimum size and has a high degree of completeness. I can not say.

  For example, in the battery box of Patent Document 1, single and single AA battery boxes are connected in the vertical direction, and the overall size in the height direction increases.

  On the other hand, in the battery box of Patent Document 2, the increase in size is suppressed by connecting single and single AA battery boxes orthogonally to each other and back to back. However, there is no difference from the configuration of Patent Document 1 in that extra dimensions are required compared to a single battery. Moreover, in the configuration of Patent Document 2, the width of the battery box corresponds to the length of the AA battery, and the diameter of the single battery is not less than a certain size. A flashlight model incorporating this battery box, etc. There is a problem that the science teaching materials cannot be downsized.

  The present invention has been made in view of the above problems, and provides a science teaching material that can selectively accommodate batteries having different dimensional sizes and has a battery housing structure in which the shape and dimension are minimized. Objective.

  In order to achieve the above object, the housing main body (22) capable of accommodating a large battery and the housing main body (22) in a released state having a shape capable of accommodating a small battery are used. An auxiliary adapter (SP), comprising a science teaching material, wherein the housing body (22) includes a first end face (26) facing the first output terminal of the large battery, and a first of the large battery. A first holding portion (28) capable of holding a second end face (27) facing the two output terminals, a first connection terminal (TH) hanging down in a plate shape along the first end face (26), and a second A second holding portion (29) that can hold a second connection terminal (TH) that hangs down in a plate shape along the end surface, and the auxiliary adapter (SP) is a first connection terminal. (TH) is configured to have a terminal holding portion (32) that can hold (TH). While the first holding portion (28) of (22) holds the first connection terminal (TH), when the small battery is used, the terminal holding portion (32) of the auxiliary adapter holds the first connection terminal (TH). Configured to hold.

  Here, the first holding part (28) and the second holding part (29) are provided outside the first end face (26) and the second end face (27) with respect to the axial direction of the large battery. Preferably, the first holding part (28) and the second holding part (29) are each provided with an opening for accommodating a part of the bent fitting (35). The main body bottom (BT) of the housing main body includes a lower surface (LW) continuous with the curved side portion, an upper surface (HG) positioned above the lower surface and capable of holding a large battery, and a lower surface. The connection surface (CN) that connects the upper surface has a stepped structure, and an engagement portion (HK) that holds the auxiliary adapter (SP) is formed by notching part of the connection surface (CN). It is effective.

  The curved side portion (SD) of the housing main body portion is configured to include a side main body having a substantially arc-shaped inner surface and a protrusion (PR) projecting radially inward from the side main body. In the battery accommodation state, it is preferable that the upper surface (HG) of the bottom portion (BT) of the main body and the protrusion (PR) of the curved side portion (SD) are in contact with the large battery. Moreover, the auxiliary | assistant bottom part (30,31) of an auxiliary adapter is formed in the cross-sectional view substantially square shape extended in the axial direction of a small battery, and is substantially in a mounting part (30) which can hold | maintain a small battery, and a mounting part. A pair of left and right leg portions (31, 31) extending perpendicularly downward and an engaged portion (34) projecting from the opposing surfaces of the pair of leg portions toward the other are configured. It is preferable.

  According to the present invention described above, it is possible to selectively accommodate batteries having different dimensional sizes, and to realize a battery housing structure in which the shape and dimension are minimized.

It is a perspective view which shows the science teaching material of an Example. It is a perspective view which shows the science teaching material of a decomposition | disassembly state. It is drawing explaining the case where an AA battery is used. It is drawing explaining a lower case. It is drawing explaining a switch member. 1 is a diagram illustrating a method of using a single battery or an AA battery. It is drawing explaining a conduction experiment.

  Hereinafter, the present invention will be described in detail based on examples. FIG. 1A to FIG. 1C are perspective views showing a completed state of a flashlight model type science teaching material, and FIG. 2 shows a disassembled science teaching material.

  As shown in FIGS. 1 to 2, this science teaching material is configured so that a lamp member 2 (FIG. 2), a switch member 3, and a battery 4 can be accommodated in a substantially cylindrical accommodation case 1. The front end side is closed by a lamp cap 5. In the present specification, the position where the lamp cap 5 is arranged is referred to as the front or the tip, as evaluated in the axial direction of the housing case 1.

  As shown in FIGS. 1D and 1E, the switch member 3 is configured by attaching a switch movable portion 3B holding a movable contact plate P2 to a switch body portion 3A holding a fixed contact plate P1. ing. The switch movable portion 3B is mounted on the switch main body portion 3A in such a manner that the switch movable portion 3B can swing, and the operation piece 6 can be turned ON / OFF (see FIGS. 1F and 1G).

  As shown in FIG. 2, the storage case 1 includes an upper case 1A provided with a receiving portion 7, an opening holding portion 10 and a holding projection 11 which are raised from the surface of the case and bridged in an elevated manner, and a switch movable portion 3B. Of the lower case 1B provided with a slide groove 8, a holding projection 12 and an opening holding portion 13 for receiving a part (sliding piece 51), while the opening holding portions 10 and 13 of the case have By receiving the holding projections 12 and 11 of the other case, the upper and lower cases 1A and 1B are integrated.

  When the upper case 1A and the lower case 1B are integrated, the entire case is closed except for the missing portion 14 of the lower case 1B and the operation port 15 of the upper case 1A. Here, the missing portion 14 is used for the operation of taking out a single battery, and also used as a connection wiring drawing path when the science teaching material is used as a tester. Since the operation piece 6 of the switch member 3 is exposed from the operation port 15, the ON / OFF operation can be performed with one hand.

  By the way, although the single battery 4a is shown in FIG. 2, in this science teaching material, it is possible to use the AA battery 4b instead of the single battery 4a by using the auxiliary adapter SP. It has become. FIG. 3B shows the auxiliary adapter SP and the AA battery 4 b together with the connection fitting 35 and the connection terminal 36 in the disassembled science teaching material.

  As shown in FIG. 3B, the lower case 1B includes a first housing portion 21 that can house the lamp member 2, the switch member 3, and the connection wiring, and a second housing portion that can house the single battery 4a. And 22. FIG. 4 shows a plan view (b), a side view (c), and a bottom view (d) of the lower case 1B. In addition, the black coating part in FIG. 4 is an opening part, and has shown that the outer surface of the lower case 1B has penetrated.

  The lower case 1B is divided into a case bottom surface BT having a flat outer surface, and a case side surface SD standing upright after being curved from the case bottom surface BT (see FIG. 4B). In this embodiment, since the case bottom surface BT has a flat outer surface, even if the science teaching material is placed on a desk or the like, there is no risk of falling off the desk. The case bottom surface BT of the first housing portion 21 is formed on a flat outer surface as a whole, but the case bottom surface BT of the second housing portion 22 has a flat outer surface on both sides where the recesses are formed. (See FIG. 3A).

  The first accommodating portion 21 forms a gap between the two upper projecting portions 23 and 23 that stand upright in a cylindrical shape upward along the case side surface SD, and the case side surface 2 apart from the case side surface SD. Each of the hook portions 24 and 24 and a lamp holding portion 25 that holds the lamp member 2 are configured. The upper projecting portion 23 and the hooking portion 24 are all fixed to the case side surface SD and are formed at symmetrical positions with respect to the central axis of the housing case 1 (FIG. 4B).

  Here, the hook portion 24 functions to receive the bottom surface of the switch member 3 in cooperation with the upper protruding portion 23.

  The second housing portion 22 includes a case bottom surface (main body bottom portion) BT in which a recess is formed, a case side surface (curved side portion) SD rising to both sides continuously to the case bottom surface BT, and a front wall surface 26 standing upright on the front side. The rear wall surface 27 stands upright on the rear side. A front holding portion 28 and a rear holding portion 29 are formed outside the front wall surface 26 and the rear wall surface 27 in the axial direction.

  The holding portions 28 and 29 are each formed with a rectangular opening hole HO. That is, the front holding part 28 and the rear holding part 29 are formed with a rectangular opening hole HO in which a part of each top surface is notched.

  Further, a rectangular hole 60 in which the entire bottom surface is cut out is formed on the bottom surface of the rear holding portion 29 (FIG. 4D). On both sides of the rectangular hole 60, slide grooves 8 and 8 are formed in parallel extending in the axial direction. These rectangular holes 60 and the two slide grooves 8 and 8 are used for the purpose of holding the switch member 3 in the upside down state. At this time, the lower storage box 45 of the switch body 3A is slid in the direction of the arrow in FIG. 4D, and this point will be described later.

  As shown in FIG. 4B and FIG. 3A, the case bottom surface (main body bottom portion) BT of the second housing portion 22 includes flat lower surfaces LW and LW continuous to the left and right case side surfaces SD, and a lower surface. The upper surface HG positioned above the LW and the connection surfaces CN and CN connecting the upper surface HG to the lower surface LW form a step structure. And the engaging part HK is formed by notching a part of connection surface CN.

  FIG. 4A schematically shows this relationship, and the engagement portions HK are discretely formed by cutting out the portion indicated by the mesh in the case bottom surface BT of the lower case 1B. . As shown in FIG. 4B and FIG. 4D, in this embodiment, the pair of engaging portions HK in the width direction are formed at two positions apart in the case axial direction.

  Four protrusions PR extending in the circumferential direction are formed on the case side surface SD so as to be separated in the case axial direction. Here, the projecting surfaces of the four protrusions PR are formed to have a curvature corresponding to the outer surface of the single battery 4a, and fulfill the function of holding the single battery 4a together with the upper surface HG (FIG. 3). (See (a)). In addition, in FIG. 3A, although the height of the connection surface CN and the protrusion PR is drawn a little large, the protrusion height of the connection surface CN is about 2 mm, and the storage case 1 is particularly enlarged. There is nothing. Rather, in this embodiment, not only the missing portion 14 is provided, but the single battery 4a is in line contact with the housing case 1 by the protrusion PR, so that the single battery 4a can be easily taken out.

  As shown in FIGS. 3C to 3E, the auxiliary adapter SP includes a mounting portion 30 having an arc surface that holds the AA battery 4 b, and a pair of left and right leg portions 31 that extend downward from the mounting portion 30. 31, a terminal holding portion 32 that stands upright on the distal end side of the placement portion 30, and a pair of gripping portions 33, 33 that are continuous with the center portion of the placement portion 30. In addition, the mounting part 30 and the holding part 33 have a circular arc surface having a curvature corresponding to the AA battery 4b.

  As shown in FIG. 3 (e), the mounting portion 30 and the two leg portions 31, 31 are substantially saddle-shaped in cross-sectional view. Here, the distance between the pair of leg portions 31 is substantially the same as the width of the upper surface HG of the case bottom surface BT. Therefore, when the auxiliary adapter SP is disposed on the case bottom surface BT, the pair of leg portions 31 and 31 have a relationship of gripping the upper surface HG of the case bottom surface BT.

  Further, a total of four projecting pieces 34 facing each other are formed on the pair of leg portions 31, 31 corresponding to the engaging portions HK of the case bottom surface BT. Therefore, when the auxiliary adapter SP is disposed on the upper surface HG of the case bottom surface BT and further lowered, the pair of legs 31, 31 are lowered while being slightly expanded, and then the protruding piece 34 is engaged with the case bottom surface BT. By fitting the portion HK, the fixing of the auxiliary adapter SP to the case bottom surface BT is completed.

  Next, the terminal holding part 32 of the auxiliary adapter SP is formed with a rectangular opening hole HO having the same dimensions as the opening holes HO of the front holding part 28 and the rear holding part 29. The opening holes HO having the same dimensions are configured to receive the U-shaped bent piece BE of the connection fitting 35. Further, the bent piece BE is configured to receive the connection terminal 36.

  Here, the connection fitting 35 is formed by bending a conductive plate having a spring property, the contact piece TH extending long downward from one side of the bent piece BE, the flat surface FL on the other side of the bent piece BE, The holding piece HD is configured to extend downward from the flat surface FL.

  The contact piece TH is a portion that elastically contacts the plus terminal and the minus terminal of the battery, and is set to a sufficient length so that reliable contact can be realized with either the AA battery 4b or the single battery 4a. The holding piece HD functions to grip the top surfaces of the front holding portion 28 and the rear holding portion 29 in cooperation with the flat surface FL. However, when the connection fitting 35 is inserted into the terminal holding portion 32 of the auxiliary adapter SP, the holding piece HD of the connection fitting 35 is inserted into the opening hole HO of the front holding portion.

  Next, the connection terminal 36 inserted into the bent piece BE of the connection fitting 35 is made of a plastic material, and is configured by integrating the operation portion 36a and the insertion portion 36b in an orthogonal state. And the plate | board thickness of the insertion part 36b is set to the same grade as the clearance gap between U-shaped bending pieces BE. The connection terminal 36 having such a configuration is used by winding a conducting wire around the insertion portion 36b in a scientific experiment. The bent pieces BE of the two connection fittings 35 are used by being inserted into the opening hole HO of the rear holding part 29 and the opening hole HO of the front holding part 28 (or the terminal holding part 32), respectively.

  In this state, when the insertion portion 36b around which the conducting wire is wound is pushed into the bent piece BE, the conducting wire slightly spreads the bent piece BE into a U shape, thereby ensuring electrical contact between the conducting wire and the connection fitting 35. .

  FIG. 5 illustrates the disassembled state (a) and the completed state (b) of the switch movable portion 3B, the disassembled state (c), the back surface state (d), and the completed state (e) of the switch body 3A. is there. The switch body 3A and the switch movable part 3B are configured to hold a fixed contact plate P1 and a movable contact plate P2, respectively. The fixed contact plate P1 and the movable contact plate P2 are conductor flat plates having the same shape, and round holes CR are formed at two locations. Further, raised claws NA slightly raised in the width direction are formed on both sides in the width direction at the center position of the conductor flat plate.

  As shown in FIG. 5A, the switch movable portion 3B includes the operation piece 6 on the front surface side and the movable main body portion 40 on the back surface side, and is integrally formed of a plastic material. The movable main body 40 is configured in a box shape as a whole, a fitting groove 41 in which left and right side walls are cut out, a connecting flat plate 42 that connects the left and right side walls, a winding part 43 that is continuous with one side wall, It is comprised. Here, the winding part 43 is used for the purpose of winding and holding the connection wiring.

  The fitting groove 41 has a shape corresponding to the receiving portion 7 of the upper case 1A. That is, corresponding to the fact that the receiving part 7 is raised from the surface of the upper case 1A and is formed in an elevated shape, the switch movable part 3B has a slightly narrower fitting than the outer diameter of the receiving part 7. A joint groove 41 is formed. Therefore, the switch movable part 3 </ b> B can be reliably fixed to the receiving part 7 by pushing the fitting groove 41 into the receiving part 7.

  In FIG. 5A, the lower side of the connecting flat plate 42 is released, and constitutes a contact holding portion that receives and holds the movable contact plate P2. Here, the height difference between the lower surface of the connecting flat plate 42 and the bottom surface of the movable main body 40 coincides with the plate thickness of the contact plates P1 and P2. Therefore, as shown in FIG. 7 (a), after winding the conductive wire around the connecting flat plate 42, when the movable contact plate P2 is pushed into the space below the connecting flat plate 42, the movable contact plate P2 corresponds to the thickness of the conductive wire. The connecting flat plate 42 is firmly held. The raised claw NA functions as a positioning piece that prevents further pushing operation.

  As shown in FIG. 5C, the switch body 3A has a shape in which an upper storage box 44 on the front side and a lower storage box 45 on the back side are integrated back to back, and is made of a plastic material. The upper storage box 44 includes a cylindrical piece 46 projecting inwardly from the left and right side walls, a connecting flat plate 47 that connects the left and right side walls, and a winding portion 48 that is continuous with the one side wall. ing. This winding part 48 is also used for the purpose of winding and holding the connection wiring. The configuration of the connecting flat plate 47 is also the same as the configuration of the connecting flat plate 42 of the switch movable part 3B.

  The cylindrical piece 46 of the switch body 3A is configured in a corresponding shape at a position corresponding to the fitting groove 41 of the switch movable part 3B. Therefore, when the switch movable portion 3B is assembled to the switch main body portion 3A, the columnar piece (locking portion) 46 receives and locks the fitting groove (locked portion) 41. In the assembled state, the center of the fitting groove 41, that is, the center of the cylindrical piece 46 becomes the rotation center of the switch movable portion 3B.

  As shown in FIG. 5 (d), the lower storage box 45 includes a cylindrical portion 50 formed on the tip side of the left and right side walls, a plate-like slide piece 51 protruding inwardly from the left and right side walls, and a slide piece. And a raised line 52 that is orthogonal to 51 and slightly rises from the bottom of the box. Here, the cylindrical portions 50 and 50 and the slide pieces 51 and 51 are provided at positions corresponding to the upper protruding portions 23 and 23 and the hooking portions 24 and 24 of the first accommodating portion 21, respectively.

  On the other hand, the raised line 52 has a length dimension that can be accommodated in the rectangular hole 60 of the lower case 1B. When the switch member 3 turned upside down is disposed on the bottom surface of the lower case 1B, the raised line 52 functions to hold the switch member 3 by being immersed in the rectangular hole 60.

  Further, the inner diameter of the cylindrical portion 50 is formed to be slightly larger than the outer diameter of the upper protruding portion 23. Therefore, when the switch member 3 is disposed in the first housing portion 21, when the switch member 3 is lowered, the cylindrical portions 50, 50 are externally fitted to the upper projecting portions 23, 23. Since the upper projecting portions 23 and 23 are fixed to the case side surface SD, the switch member 3 lowered to a predetermined position is prevented from further lowering operation. In this blocking state, the lower surfaces (the upper surfaces in FIG. 5D) of the slide pieces 51 and 51 are in contact with the upper surfaces of the hook portions 24 and 24.

  By the way, the two slide grooves 8 formed at the base end portion of the lower case 1B are formed corresponding to the depth of the lower storage box 45 and the configuration of the slide pieces 51 and 51. Therefore, when the switch main body 3A reversed to the state of FIG. 5D is arranged behind the lower case 1B and moved in the direction of the arrow in FIG. 5D, the slide pieces 51 and 51 slide. Slide in the groove 8. At this time, the raised line 52 of the switch body 3A rides on the outer surface of the lower case 1B, slides, and is finally immersed in the rectangular hole 60, so that the switch body 3A is moved into the lower case 1B. Can be fixed.

  At this time, if the switch movable portion 3B is integrated with the switch body portion 3A, the movable contact plate P2 and the fixed contact plate P1 are in a close positional relationship. Therefore, if the movable contact plate P2 and the fixed contact plate P1 are pressed against various substances in a state where the internal wiring is completed, the science teaching material functions as a tester.

  On the other hand, when the switch movable portion 3B is separated from the switch main body portion 3A and the fitting groove 41 of the separated switch movable portion 3B is fitted to the receiving portion 7, the distance between the movable contact plate P2 and the fixed contact plate P1 is increased. Since it spreads considerably, a large material continuity tester can be performed with one hand.

  In any continuity test, the lamp member 2 is lit on the distal end side with respect to the movable contact plate P2 and the fixed contact plate P1 disposed on the proximal end side. Can grasp.

  Next, a method of using the science teaching material of the embodiment having the above configuration will be described. 6A to 6B show a case where a single battery is used. The bent piece BE of the connection fitting 35 is inserted into the opening hole HO of the rear holding part 29 and the opening hole of the front holding part 28 is used. The bent piece BE of the connection fitting 35 is also inserted into HO. Further, the lamp member 2 is disposed in the lamp holding portion 25.

  Next, the connection terminal 36 in which the lead wire of the lamp wiring is wound around the insertion portion 36b and the connection terminal 36 in which the lead wire of the connection wiring is wound around the insertion portion 36b are respectively connected to the opening holes HO of the front holding portion 28 and the rear holding portion 29. It pushes into the bending piece BE located in.

  As a result, since the electrical wiring is completed, it is possible to experiment whether or not the lamp is lit by pressing the conductors of the two connection wirings against various substances.

  On the other hand, FIG.6 (c)-FIG.6 (d) have shown the case where an AA battery is used. In this case, the auxiliary adapter SP is disposed on the case bottom surface BT of the second housing portion 22, and the bent piece BE of the connection fitting 35 is inserted into the opening hole HO of the terminal holding portion 32. The subsequent procedure is the same as when the first battery is used, and even a lower grade student can perform a lamp experiment without any problem.

  Next, a continuity experiment (tester experiment) using the same science teaching material will be described with reference to FIG. In addition, the assembly method when assembling the science teaching material as a flashlight is as shown in FIG. When the switch member 3 is taken out from the housing case 1 in this assembled state, a switch experiment shown in FIG. 7B can be performed.

  7A, when the switch member 3 is separated into the switch body 3A and the switch movable part 3B, the two contact plates P1 and P2 can be used as tester terminals.

  Further, when conducting a conduction experiment with one hand, as shown in FIG. 7 (d), the assembled switch member 3 is reversed, and the slide piece 51 of the switch body 3A is inserted into the slide groove of the lower case 1B. 8 may be inserted. In this case, since the two contact plates P1 and P2 are close to each other, a small substance conduction experiment can be performed.

  When conducting a conduction experiment on a large substance, the switch movable portion 3B is separated from the switch main body portion 3A, and the fitting groove 41 of the switch movable portion 3B is fitted to the receiving portion 7 of the upper case 1A. In this case, since the separation distance between the two contact plates P1 and P2 is ensured, even a relatively large substance can be conducted with one hand. Moreover, the lighting state of the lamp member 2 can be directly observed.

22 housing body SP auxiliary adapter 26 first end face 27 second end face TH first connection terminal, second connection terminal 28 first holding part 29 second holding part 32 terminal holding part

Claims (5)

An accommodating body that can accommodate a large battery;
An auxiliary adapter that has a shape that can accommodate a small battery and is arranged and used in an accommodation body in an open state, and is a science teaching material that includes:
The housing body includes a first end face facing the first output terminal of the large battery, a second end face facing the second output terminal of the large battery, and a first connection that hangs down in a plate shape along the first end face. While having a first holding part capable of holding a terminal and a second holding part capable of holding a second connection terminal that hangs down in a plate shape along the second end surface,
The auxiliary adapter is configured to have a terminal holding portion capable of holding the first connection terminal,
When the large battery is used, the first holding part of the housing main body holds the first connection terminal, while when using the small battery, the terminal holding part of the auxiliary adapter is configured to hold the first connection terminal. Science teaching materials characterized by The first holding part and the second holding part are provided outside the first end face and the second end face with respect to the axial direction of the large battery,
The science teaching material according to claim 1, wherein the first holding portion and the second holding portion are each provided with an opening that accommodates a part of the bent connection fitting. The bottom of the main body of the housing main body has a step formed by a lower surface continuous to the curved side, an upper surface positioned above the lower surface and capable of holding a large battery, and a connection surface connecting the lower surface and the upper surface. And
The science teaching material according to claim 1 or 2, wherein an engaging portion for holding the auxiliary adapter is formed by cutting out a part of the connection surface. The curved side portion of the housing main body is configured to include a side main body having a substantially arc-shaped inner surface, and a protrusion protruding radially inward from the side main body,
The science teaching material according to any one of claims 1 to 3, wherein an upper surface of the bottom of the main body and a protrusion on the curved side portion are configured to contact the large battery when the large battery is accommodated. The auxiliary bottom portion of the auxiliary adapter is formed in a substantially square shape in cross-sectional view extending in the axial direction of the small battery,
A mounting portion capable of holding a small battery, a pair of left and right legs extending substantially perpendicular to the mounting portion and extending downward, and an engaged portion projecting from the opposing surfaces of the pair of legs toward the other The science teaching material according to claim 1, comprising: