Educational equipment

Abstract

We provide educational equipment that can be used to educate workers on the correct way to use stepladders. [Solution] The educational device comprises a first base including a first through-hole, a second base, a shaft extending in a first direction, and a loading platform connected to the shaft and protruding in a direction different from the first direction. The first base is installed on the upper surface of the top plate, the second base is installed so as to straddle the upper surface of the uppermost step, and the shaft is installed so as to be inserted through the first through-hole from above the top plate and abut against the seat surface of the second base. The loading platform has casters at its bottom, and the casters move circumferentially on the surface of the first base with respect to the axle, allowing the protruding direction of the loading platform to continuously change between a second direction, which is the direction in which the pair of uppermost steps are separated, and a third direction, which is the direction in which the uppermost steps extend.

Description

Technical Field

[0001] The present invention relates to an educational instrument that can be attached to a stepladder and used for educational purposes related to the correct method of using a stepladder. Background Art

[0002] Stepladders are generally and widely used at work sites. However, precisely because stepladders are so familiar to workers, they often use them incorrectly with little awareness of the risks, which can lead to accidents. The Ministry of Health, Labour and Welfare of Japan has published a leaflet titled "Let's Eliminate Falls from Ladders and Stepladders".

[0003] The stepladder work experience device disclosed in Patent Document 1 allows the stepladder itself to be moved around a plurality of axes by a support portion provided at the bottom of the stepladder while an operator is using the stepladder. Thereby, the position of the stepladder is displaced, allowing workers to sense danger and recognize in advance actions that can be taken when a dangerous situation occurs. Prior Art Documents Patent Documents

[0004] Patent Document 1 Japanese Unexamined Patent Application Publication No. 2019-015907 Summary of the Invention Problem to be Solved by the Invention

[0005] However, the device disclosed in Patent Document 1 is extremely large-scale, so it takes time to prepare for and conduct training. In particular, since the training is premised on having workers climb the stepladder during the training, it needs to be performed multiple times for each worker.

[0006] It is known that many accidents involving stepladders are caused by incorrect usage. Therefore, there is a need for education and training that allows people to learn the correct way to use stepladders in the shortest possible time.

[0007] In view of the above, the present invention aims to provide an educational device that can be used to educate workers on the correct use of stepladders and has a relatively simple structure. [Means for solving the problem]

[0008] The educational device according to the present invention is an educational device that can be attached to and detached from a stepladder having a through gap in the top plate, The first base including the first through hole, The second pedestal and A shaft portion extending in the first direction, The system comprises a loading platform connected to the shaft portion and protruding from a location other than the end of the shaft portion in a direction different from the first direction, The first base is installed on the upper surface of the top plate when attached to the stepladder, with the through gap of the top plate and the first through hole in connection. The second base is installed so as to straddle the top surface of the pair of uppermost steps, which are the steps one step below the top plate, when attached to the stepladder. The shaft portion is installed so as to be inserted from above the top plate through the first through hole and the through gap and contact the seating surface of the second base when attached to the stepladder. The aforementioned cargo bed section is It has casters on the bottom, With the shaft attached to the stepladder, the caster moves circumferentially on the surface of the first base with respect to the shaft, so that the protruding direction of the loading platform can be continuously changed between a second direction, which is the direction in which the pair of uppermost steps are separated, and a third direction, which is the direction in which the uppermost steps extend.

[0009] The educational equipment with the above configuration can be installed by attaching the first base, second base, and shaft to the designated locations on the stepladder. A platform is connected to the shaft, and casters are attached to the bottom of this platform. By moving the casters, the direction in which the platform protrudes can be continuously changed between the direction in which the pair of steps are separated when the stepladder is extended (second direction) and the direction in which the steps extend (third direction).

[0010] When a worker is standing on a stepladder facing the correct direction, the stepladder remains stable even when the worker reaches out to perform a specific task. However, when a worker is standing on a stepladder facing the wrong direction, the stepladder is more likely to lose its stability and fall over when the worker reaches out to perform the task.

[0011] Here, the correct orientation is when the worker is standing on the ladder with both feet on the same step. In this position, if the worker reaches out their hand, the direction in which they reach out will be the direction of the distance between the pair of steps when the ladder is spread apart (the second direction).

[0012] On the other hand, an incorrect orientation is when a worker is straddling the top platform and climbing the ladder with both feet on the steps. Typically, this occurs when a worker is climbing the ladder with one foot on one step of equal height and the other foot on the other step. In this position, if the worker reaches out, the direction in which they reach will be in the direction of the extension of the steps (the third direction).

[0013] In other words, with the educational device having the above structure, by attaching the first base, the second base, and the shaft to their respective designated locations on the stepladder, and moving the casters of the platform connected to the shaft on the surface of the first base, the direction in which the platform protrudes can be switched between the direction in which a worker reaching out when climbing the stepladder in the correct orientation (second direction) and the direction in which a worker reaching out when climbing the stepladder in the wrong orientation (third direction).

[0014] As a result, for example, by having students observe a situation where a light external force is applied to a stepladder with the platform protruding in the second direction, and a situation where the same amount of external force is applied to the stepladder after changing the platform protruding in the third direction, they can visually understand the difference in stability between the two stepladders. In the example above, students can visually see that the former stepladder is stable, while the latter stepladder is less stable and falls over relatively easily.

[0015] The aforementioned cargo bed section is An outer frame portion including a first side portion fixed to the shaft portion, a second side portion adjacent to the first side portion, a third side portion adjacent to the first side portion and facing the second side portion, and a bottom portion covered in three directions by the first side portion, the second side portion, and the third side portion, A pair of simulated arms are located inside the outer frame and extend parallel to the second and third sides, respectively. It includes a storage section in the region sandwiched between the pair of simulated arms, on which an item can be placed from above, The pair of simulated arms are configured to be extendable and retractable by sliding in the same direction as the protruding direction of the cargo bed relative to the outer frame. The position of the storage section may be displaced in the same direction as the protruding direction of the cargo bed as the pair of simulated arms extend and retract.

[0016] With the above configuration, by placing items as loads in the storage compartment and extending the simulated arm, it is possible to more accurately simulate the state of a worker reaching out from a stepladder.

[0017] More specifically, when the protruding direction of the loading platform is set to the second direction, and a load is applied to the storage compartment to extend the simulated arm in the same direction as the protruding direction of the loading platform (the second direction), the situation of a worker reaching out while climbing a stepladder in the correct orientation is simulated. On the other hand, by applying a load to the storage compartment and changing the protruding direction of the loading platform to a third direction while keeping the simulated arm extended, the situation of a worker reaching out while climbing a stepladder in the wrong orientation is simulated.

[0018] The second pedestal has a protrusion protruding upward relative to the seat surface at a partial position of the seat surface, the protrusion includes a second through hole for screwing, the shaft portion has a third through hole for screwing at a predetermined position, the shaft portion may be screwed so as to penetrate through the second through hole and the third through hole in a state where the shaft portion is installed so as to abut against the seat surface of the second pedestal when being attached to the stepladder.

[0019] According to this, the second pedestal installed on the upper surface of the top step rung and the shaft portion abutting against the second pedestal can be stably fixed. In addition, since fixing is performed by screwing, it is easy to remove the educational appliance from the stepladder after the training is completed.

[0020] the educational appliance further comprises a pair of support members provided with a fourth through hole, the shaft portion has a pair of notches cut out from the outside in a direction different from the direction in which the third through hole penetrates at a predetermined position, and a fifth through hole for screwing formed in the pair of notches, the pair of support members may be screwed so as to penetrate through the fourth through hole and the fifth through hole by being fitted into each of the pair of notches when the shaft portion is attached to the stepladder, thereby coming into contact with the shaft portion and the bottom surface of the top plate.

[0021] According to the above configuration, the support member in contact with the top plate and the shaft portion are screwed together. This screwing direction is different from the direction in which the second pedestal and the shaft portion are screwed together. Thereby, the shaft portion can be installed more stably with respect to the stepladder.

[0022] the educational appliance is provided with a simulated head including a bottom plate and a head-shaped member fixed to the bottom plate and protruding upward from the surface of the bottom plate, The simulated head is installed on the upper part of the pair of simulated arms, with the shaft attached to the stepladder, inside the outer frame, such that the bottom plate straddles the pair of simulated arms. The position of the simulated head may be displaced in the same direction as the protruding direction of the cargo bed as the pair of simulated arms extend and retract.

[0023] With the above configuration, the trainee can see the simulated head that has the shape of a head, and therefore, during training using the training equipment, the trainee can intuitively grasp the orientation of the posture of the worker who is currently simulating climbing a stepladder.

[0024] The shaft portion has a hook provided at the end of the pair of ends of the shaft portion that is opposite to the end that comes into contact with the second base when attached to the stepladder. The aforementioned hook may be one that is attached to the other end of a wire, with one end of the wire being fixed.

[0025] With the above configuration, by positioning the protruding direction of the loading platform in a third direction, that is, the direction in which a worker reaching out while climbing the ladder in the wrong direction would be, the ladder becomes unstable. Even if the ladder falls over, the wire prevents it from reaching the floor. This prevents loud noises from being generated during training and prevents damage to the ladder. [Effects of the Invention]

[0026] According to the present invention, an educational device with a relatively simple structure can be realized that can be used to educate workers on the correct way to use stepladders. [Brief explanation of the drawing]

[0027] [Figure 1] This is a schematic perspective view showing an example of the structure of a stepladder before educational equipment is attached. [Figure 2] Figure 1 is a schematic perspective view showing the stepladder 1 with educational equipment attached. [Figure 3]Figure 2 is a schematic perspective view showing the simulated arm 42 in an extended state. [Figure 4] This is a schematic perspective view showing the structure of the second base 20. [Figure 5] This is a schematic perspective view showing the structure of the first base 10. [Figure 6] This is a schematic perspective view showing the structure of the shaft section 30 and the loading platform section 40. [Figure 7] This is a schematic perspective view showing the structure of the shaft section 30 and the cargo bed section 40, and is shown by inverting the image vertically from Figure 6. [Figure 8] This is a schematic perspective view showing the structure of the simulated head 50. [Figure 9] This is a schematic perspective view illustrating one procedure for installing educational equipment on stepladder 1. [Figure 10] This is a schematic perspective view illustrating one procedure for installing educational equipment on stepladder 1. [Figure 11] This is a schematic perspective view illustrating one procedure for installing educational equipment on stepladder 1. [Figure 12] This is a schematic perspective view illustrating one procedure for installing educational equipment on stepladder 1. [Figure 13] This is a schematic perspective view illustrating one procedure for installing educational equipment on stepladder 1. [Figure 14] This is a schematic perspective view illustrating one procedure for installing educational equipment on stepladder 1. [Figure 15] This is a schematic perspective view illustrating one procedure for installing educational equipment on stepladder 1. [Figure 16] This is a schematic perspective view showing a portion of the stepladder 1 with educational equipment attached. [Figure 17] This is a schematic perspective view showing a portion of the stepladder 1 with educational equipment attached, and is a drawing of the ladder with the protruding direction of the loading platform 40 changed from that of Figure 16. [Figure 18] This is a schematic perspective view showing how a load is placed on educational equipment attached to stepladder 1. [Figure 19]This is a schematic perspective view showing the extended state of the simulated arm 42 of an educational device attached to a stepladder 1 and bearing a load 71. [Figure 20] This is a schematic perspective view showing the loading platform 40 being rotated from the state shown in Figure 19. [Figure 21] This is a schematic perspective view showing how the protruding direction of the loading platform 40 is set to simulate the incorrect posture of a stepladder user. [Figure 22] This is a schematic perspective view illustrating that stepladder 1 is unstable. [Figure 23] This is a perspective view illustrating a method for intentionally reducing the stability of stepladder 1. [Modes for carrying out the invention]

[0028] Embodiments of the educational device according to the present invention will be described below with reference to the drawings as appropriate. Note that the following drawings are schematic representations, and the dimensional ratios and number of elements shown in the drawings do not necessarily correspond to the actual dimensional ratios and number of elements.

[0029] The educational device according to the present invention is a device that can be attached to and detached from a stepladder, and when attached to a stepladder, it can be used to teach the correct way to use a stepladder.

[0030] Figure 1 is a schematic perspective view showing an example of the structure of a stepladder before the educational equipment of this embodiment is attached. The stepladder 1 shown in Figure 1 is shown with its four support columns 5 extended. The stepladder 1 has a top platform 2 and a number of steps 4, 4, ... Steps 4, 4, ... are the places where a worker's feet are placed when climbing the stepladder 1. In this specification, the step 4 located directly below the top platform 2 (one step below the top platform 2) is referred to as the "uppermost step 3".

[0031] As an example of stepladder 1, the "combination stepladder" specified in JIS S 1121:2013 is given.

[0032] The educational equipment of this embodiment will be described below with reference to Figures 2 to 22.

[0033] Figure 2 is a schematic perspective view showing the educational device of this embodiment attached to the stepladder 1 of Figure 1. The educational device of this embodiment is composed of multiple components. In detail, the educational device of this embodiment includes a first base 10, a second base 20, a shaft portion 30, a loading platform portion 40, and a simulated head 50. However, whether or not the educational device includes a simulated head 50 is optional.

[0034] As will be described later, when the educational equipment is attached to the stepladder 1, the first base 10 is placed on the top surface 2 of the stepladder 1, and the second base 20 is placed so as to straddle the pair of uppermost steps 3 (see Figure 1). The shaft portion 30 passes through the first base 10 and abuts against the top surface of the second base 20.

[0035] Preferably, as shown in Figure 2, a hook 31 is provided on the end of the shaft portion 30 opposite to the end that abuts the second base 20. This hook 31 is attached to a wire 70, one end of which is fixed to a predetermined location (for example, the ceiling).

[0036] The loading platform 40 is connected to the shaft 30. More specifically, the loading platform 40 is connected to the shaft 30 at locations other than the ends, and protrudes in a direction different from the extending direction of the shaft 30 (corresponding to the "first direction"). In the example in Figure 2, the shaft 30 extends in the vertical direction of the paper, and the loading platform 40 protrudes from the shaft 30 in the horizontal direction of the paper.

[0037] As shown in Figure 3, the loading platform 40 includes an outer frame 41 and a simulated arm 42. The simulated arm 42 is configured to extend and retract in the same direction as the protruding direction of the loading platform 40. More specifically, the simulated arm 42 is located inside the outer frame 41 and has a structure that allows it to slide along the protruding direction of the outer frame 41. Although not shown in Figure 3, casters 45 are provided at the bottom of the loading platform 40 (see Figure 14, which will be described later).

[0038] As shown in Figure 4, the second base 20 has a structure comprising a seating surface 21 and a protrusion 22 projecting from the seating surface 21. The seating surface 21 and the protrusion 22 are fixedly connected. The protrusion 22 is provided with a through hole (second through hole 23) which serves as a screw hole. The second base 20 is typically made of wood from the viewpoint of ease of handling and manufacturing cost. However, the second base 20 is not limited to wood and may be made of metal or resin, for example.

[0039] As shown in Figure 5, the first base 10 has a seating surface 11 and a through hole (first through hole 12) that penetrates the seating surface 11. Furthermore, preferably, a stopper member 13 and a stopper member 14 are provided on the seating surface 11 of the first base 10.

[0040] As will be described later, when using the educational equipment of this embodiment, the direction of protrusion of the loading platform 40 is changed by moving the casters 45 (see Figure 14, described later) provided on the bottom of the loading platform 40 in the circumferential direction on the seat surface 11 of the first base 10. The stopper member 13 functions as a stopper for the casters 45. The stopper member 14 also functions as a stopper to restrict the loading platform 40 from moving any further once it has completed its rotational movement to a predetermined position.

[0041] As described above, the shaft section 30 and the loading platform section 40 are connected (see Figures 6 and 7). For illustrative purposes, Figure 7 corresponds to a drawing that is inverted vertically from Figure 6.

[0042] The shaft portion 30 has a through hole (third through hole 33) which serves as a screw hole near the end opposite to the side on which the hook 31 is provided. Furthermore, preferably, the shaft portion 30 has a pair of notches 32 formed in some locations, cut out from the outside in a direction different from the direction through which the third through hole 33 penetrates. The function of the notches 32 will be described later.

[0043] As described above, the loading platform 40 has an outer frame 41 and simulated arm sections 42. The outer frame 41 includes a first side section 41a, a second side section 41b, a third side section 41c, and a bottom section 41d. The bottom section 41d is covered on three sides by the first side section 41a, the second side section 41b, and the third side section 41c. The side facing the bottom section 41d is open. The first side section 41a is fixed to the shaft section 30 via a hinge 47. The second side section 41b and the third side section 41c form mutually opposing surfaces. A pair of simulated arm sections 42 are positioned inside the second side section 41b and inside the third side section 41c. A storage section 43 capable of accommodating articles is formed in the area sandwiched between the pair of simulated arm sections 42. As shown in Figure 7, casters 45 are provided on the bottom section 41d.

[0044] As shown in Figure 8, the simulated head 50 includes a base plate 51 and a member 52 that has a head shape. The base plate 51 and the member 52 are fixed together.

[0045] The materials for the first base 10, the shaft 30, the loading platform 40, and the simulated head 50 are typically made of wood, similar to the material for the second base 20, but can be made of any material, such as resin or metal. Furthermore, each component may be composed of multiple materials.

[0046] Referring to Figures 9 to 15, the procedure for attaching the educational equipment of this embodiment to the stepladder 1 will be described.

[0047] First, as shown in Figure 9, the second base 20 is installed so as to straddle the pair of uppermost steps 3,3. Next, as shown in Figure 10, the first base 10 is installed on the top surface of the top plate 2. Note that the order in which the second base 20 and the first base 10 are installed may be reversed.

[0048] As shown in Figures 9 to 10, when the support column 5 of the stepladder 1 is opened, a through gap 6 is formed in the top plate 2. The first base 10 is installed on the upper surface of the top plate 2 such that the first through hole 12 provided in the first base 10 is connected to the through gap 6.

[0049] Next, as shown in Figures 11 and 12, the shaft portion 30 is passed through the first through hole 12 and the through gap 6 and brought into contact with the seating surface 21 of the second base 20. In this embodiment, the second through hole 23 provided in the protrusion 22 of the second base 20 and the third through hole 33 provided in the shaft portion 30 are installed in contact with each other. By bringing the shaft portion 30 into contact with the seating surface 21 while making contact with the surface of the protrusion 22, the positioning of the shaft portion 30 so that the second through hole 23 and the third through hole 33 are in contact can be easily performed.

[0050] Next, as shown in Figure 13, a screw 38 is inserted through the second through hole 23 and the third through hole 33 and fastened with a screw. A pair of support members 36, 36 are prepared and fitted into the pair of notches 32, 32. At this time, the pair of support members 36, 36 are in contact with the bottom surface of the top plate 2 of the stepladder 1.

[0051] The shaft portion 30 has a through hole (fifth through hole 35) that serves as a screw hole, located between a pair of notches 32, 32. This fifth through hole 35 has a different direction of penetration than the third through hole 33. The pair of support members 36, 36 each have a through hole (fourth through hole 34) that serves as a screw hole formed inside. When the pair of support members 36, 36 are fitted into the pair of notches 32, 32, the fourth through hole 34 and the fifth through hole 35 are connected. Then, a screw 39 is inserted through the fourth through hole 34 and the fifth through hole 35 and fastened with a screw.

[0052] According to the above configuration, the shaft portion 30 is screwed to the second base 20 with screws 38. The shaft portion 30 is also screwed to the support members 36, 36 with screws 39, and these support members 36, 36 are in contact with the bottom surface of the top plate 2. As described above, the screws 39 extend in a different direction from the screws 38. In other words, the shaft portion 30 can be fixed to the stepladder 1 from two different directions, so that the shaft portion 30 and the platform portion 40 connected thereto can be stably attached to the stepladder 1.

[0053] Figure 14 is a drawing viewed from a different direction than Figure 13. As shown in Figure 14, the caster 45 attached to the bottom 41d of the loading platform 40 (outer frame 41) is positioned on the seat surface 11 of the first base 10. In the state shown in Figure 14, the protruding direction of the loading platform 40 corresponds to the direction in which the uppermost step 3 (and each step 4 of the same height) are separated. This direction is referred to as the "second direction". When the protruding direction of the loading platform 40 is the second direction, the movement of the caster 45 in a predetermined direction is restricted by the stopper member 13.

[0054] As described above, the shaft portion 30 and the loading platform portion 40 are connected via a hinge 47. The loading platform portion 40 can rotate around the connection point of the hinge 47 by moving the casters 45 in the circumferential direction on the seat surface 11 of the first base 10. When the loading platform portion 40 rotates and comes into contact with the stopper member 14 provided on the seat surface 11 of the first base 10, further movement is restricted.

[0055] Subsequently, as shown in Figure 15, the simulated head 50 is attached to the cargo bed 40. More specifically, the bottom plate 51 of the simulated head 50 is placed inside the outer frame 41, straddling the simulated arm 42. As a result, when the simulated arm 42 extends, the position of the simulated head 50 is also displaced accordingly.

[0056] The method of using the educational device of this embodiment, which is attached to the stepladder 1, will be explained below with reference to Figures 16 to 22.

[0057] Figure 16 is a diagram showing a state in which the protruding direction of the cargo bed 40 is set in a direction that causes the uppermost step 3 (and each step 4 of the same height) to be separated, similar to what was described above with reference to Figure 14.

[0058] Figure 17 shows the state in which the loading platform 40 is rotated around the connection point by the hinge 47 by moving the caster 45 on the seat surface 11 of the first base 10, from the state in Figure 16, thereby changing the protruding direction of the loading platform 40 by approximately 90°. In this case, the protruding direction of the loading platform 40 corresponds to the direction in which the uppermost step 3 (and each step 4) extends. This direction is referred to as the "third direction".

[0059] The correct orientation (posture) for a worker climbing ladder 1 corresponds to the case where both feet are placed on the same step. In this position, when the worker extends their hand, the direction of the outstretched hand is the direction of separation between the uppermost step 3 (and each step 4 of the same height) when the ladder is spread open, i.e., the second direction. Therefore, the state shown in Figure 16 simulates a worker extending their hand while climbing the ladder in the correct orientation.

[0060] On the other hand, an incorrect orientation (posture) when a worker climbs onto stepladder 1 corresponds to the case where the worker straddles the top platform 2 and places both feet on the uppermost step 3 or another step 4. In this state, if the worker reaches out, the direction in which the hand reaches out will be the direction in which the uppermost step 3 (and each step 4) extends, i.e., the third direction. Therefore, the state shown in Figure 17 simulates a situation where a worker is reaching out while climbing the stepladder in the wrong orientation.

[0061] Thus, with the educational device of this embodiment, by rotating the platform 40 using the casters 45, it is possible to easily switch between simulating a worker climbing the stepladder 1 in the correct posture and simulating a worker climbing the stepladder in an incorrect posture.

[0062] For example, in the state shown in Figure 16, even if the instructor applies an external force to stepladder 1, stepladder 1 remains stable. However, if the same external force is applied after transitioning to the state shown in Figure 17, stepladder 1 will fall over. By allowing trainees to visually observe this, they can intuitively understand that the stability of stepladder 1 varies greatly depending on the worker's posture when climbing it.

[0063] Furthermore, as shown in Figure 18, the same procedure as above may be performed after housing the load 71 in the housing section 43. In Figure 18, a plastic bottle filled with water is shown as an example of the load 71, but any item having a predetermined weight and that can be housed in the housing section 43 can be used as the load 71. By housing the load 71 in the housing section 43, the state in which force is applied to the stepladder 1 when a worker is climbing on the stepladder 1 and working can be more accurately simulated.

[0064] Figure 19 schematically shows the state in which the simulated arm 42 is extended from the state shown in Figure 18. The protruding direction of the loading platform 40 is the second direction, and the extension direction of the simulated arm 42 is also the second direction. In other words, Figure 19 simulates a worker who has climbed onto the stepladder 1 in the correct orientation and extended both arms for work. In this state, the load 71 is contained in the storage section 43, but the stepladder 1 remains stable.

[0065] Figure 20 shows how the loading platform 40 is rotated around the hinge 47 by moving the caster 45 on the seat surface 11 of the first base 10, starting from the state shown in Figure 19. With the educational device of this embodiment, the loading platform 40 can be rotated even while the simulated arm 42 is extended.

[0066] Figure 21 schematically shows a state in which the protruding direction of the loading platform 40 is set to the extension direction of each step (3,4), i.e., the third direction, by rotating the loading platform 40 in the d1 direction. As described above, the state in Figure 21 simulates a situation in which a worker is reaching out while climbing the ladder in the wrong direction.

[0067] Figure 22 is a schematic diagram showing the state after the instructor releases their hands from the state shown in Figure 21. As described above, since the load 71 is installed in the storage section 43, a force is applied to the unstable stepladder 1, causing the stepladder 1 itself to tip over in the direction d2. However, as described above, since the wire 70, with one end fixed, is attached to the hook 31, the stepladder 1 is prevented from falling to the floor. This prevents the stepladder 1 from being damaged or making a loud noise by falling to the floor during training.

[0068] As described above, the educational device of this embodiment allows for easy switching between simulating a worker standing on the stepladder 1 in the correct orientation with both arms extended, and simulating a worker standing on the stepladder in the wrong orientation with their hands extended. Furthermore, in the former simulated state, the stepladder 1 is highly stable, while in the latter simulated state, the stepladder 1 is less stable and easily falls over, which can be visually demonstrated to the trainee.

[0069] [Alternative Embodiment] The following describes other embodiments.

[0070] (1) As shown in Figure 23, a simulated step 60 may be provided between the bottom 7 of any one of the support columns 5 of the stepladder 1 and the floor surface, and the stability of the stepladder 1 may be visually confirmed by following the same procedure as described above. By providing the simulated step 60, the instability of the stepladder 1 when the protruding direction of the platform 40 is set to the third direction becomes more pronounced, and the stepladder 1 becomes easier to tip over. This makes it easier for the student to understand the correct way to use the stepladder 1.

[0071] (2) The above-mentioned method of fixing the components together is merely an example. In detail, the method of screwing the components together and other details can be modified as appropriate.

[0072] (3) The present invention is not limited to the embodiments described above, and includes various modifications. For example, the embodiments described above are described in detail for a better understanding of the present invention and are not necessarily limited to all configurations described. The scope of the present invention is indicated by the claims, and all modifications within the meaning and scope equivalent to the claims are intended to be included. [Explanation of Symbols]

[0073] 1: Step ladder 2: Top plate 3: Top step 4: Stepping 5: Prop 6: Through-gap 7: Bottom of strut 10:First pedestal 11: The seat of the first pedestal 12:First through hole 13: Stopper component 14: Stopper component 20:Second pedestal 21: The seat of the second pedestal 22: Convex part 23:Second through hole 30: Shaft 31: Hook 32: Notch 33: Third through hole 34: Fourth through hole 35: Fifth through hole 36: Support member 38: Screw 39: Screw 40: Cargo bed section 41: Outer frame 41a: First side of the outer frame 41b: Second side of the outer frame 41c: Third side of the outer frame 41d: Bottom of the outer frame 42: Simulated arm 43: Containment Unit 45: Caster 47: Hinge 50:Mock head 51: Base plate of the simulated head 52: Head-shaped component of the simulated head 60: Simulated step 70: Wire 71: Load

Claims

1. An educational device that can be attached to and detached from a stepladder having a through-gap in the top plate, The first base including the first through hole, The second pedestal and A shaft portion extending in the first direction, The system comprises a loading platform connected to the shaft portion and protruding from a location other than the end of the shaft portion in a direction different from the first direction, The first base is installed on the upper surface of the top plate when attached to the stepladder, with the through gap of the top plate and the first through hole in connection. The second base is installed so as to straddle the top surface of the pair of uppermost steps, which are the steps one step below the top plate, when attached to the stepladder. The shaft portion is installed so as to be inserted from above the top plate through the first through hole and the through gap and contact the seating surface of the second base when attached to the stepladder. The aforementioned cargo bed section is An outer frame portion including a first side portion fixed to the shaft portion via a hinge, a second side portion adjacent to the first side portion, a third side portion adjacent to the first side portion and facing the second side portion, and a bottom portion covered in three directions by the first side portion, the second side portion, and the third side portion, A pair of simulated arms are located inside the outer frame portion, extending parallel to the second and third side portions, and are extendable and retractable along the direction of extension. Having casters attached to the bottom, An educational device characterized in that, with the shaft attached to the stepladder and the caster in contact with the surface of the first base, the caster moves circumferentially on the surface of the first base with respect to the hinge, thereby allowing the protruding direction of the loading platform, which is the direction in which the second and third sides extend, to change continuously between a second direction, which is the direction in which the pair of uppermost steps are separated, and a third direction, which is the direction in which the uppermost steps extend.

2. The cargo bed includes a storage area in which articles can be placed from above in the region sandwiched between the pair of simulated arms. The educational device according to claim 1, characterized in that the position of the storage portion is displaced in the same direction as the protruding direction of the cargo bed portion as the pair of simulated arms extend and retract.

3. The second base has a protrusion that projects upward relative to the seat surface at a certain point on the seat surface, The aforementioned protrusion includes a second through-hole for screw fastening. The shaft portion has a third through-hole for screw fastening at a predetermined location. The educational device according to claim 1 or 2, characterized in that the shaft portion is screwed through the second through hole and the third through hole while in a position where it is in contact with the seat surface of the second base when attached to the stepladder.

4. It further comprises a pair of support members, each having a fourth through-hole. The aforementioned shaft portion is A pair of notches are cut out from the outside in a direction different from the direction in which the third through-hole penetrates, at a predetermined location, The pair of notches are formed extending in opposing directions and have a fifth through hole for screw fastening, The educational device according to claim 3, characterized in that the pair of support members are fitted into each of the pair of notches when the shaft portion is attached to the stepladder, thereby contacting the shaft portion and the bottom surface of the top plate, and are screwed in so as to pass through the fourth through hole and the fifth through hole.

5. The device comprises a simulated head including a base plate and a head-shaped member fixed to the base plate and protruding upward from the surface of the base plate, The simulated head is installed on the upper part of the pair of simulated arms, with the shaft attached to the stepladder, inside the outer frame, such that the bottom plate straddles the pair of simulated arms. The educational device according to claim 2, characterized in that the position of the simulated head is displaced in the same direction as the protruding direction of the cargo bed as the pair of simulated arms extend and retract.

6. The shaft portion has a hook provided at the end of the pair of ends of the shaft portion that is opposite to the end that comes into contact with the second base when attached to the stepladder. The educational device according to claim 1 or 2, characterized in that the hook is attached to the other end of a wire, one end of which is fixed.

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