JP2019035883A - Lever experiment tool - Google Patents

Lever experiment tool Download PDF

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JP2019035883A
JP2019035883A JP2017157789A JP2017157789A JP2019035883A JP 2019035883 A JP2019035883 A JP 2019035883A JP 2017157789 A JP2017157789 A JP 2017157789A JP 2017157789 A JP2017157789 A JP 2017157789A JP 2019035883 A JP2019035883 A JP 2019035883A
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arm
shaft
fulcrum
hole
support column
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JP7058090B2 (en
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昌俊 足利
Masatoshi Ashikaga
昌俊 足利
一平 村本
Ippei Muramoto
一平 村本
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Sakura Seiki Co Ltd
Uchida Yoko Co Ltd
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Sakura Seiki Co Ltd
Uchida Yoko Co Ltd
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Abstract

To provide a lever experiment tool capable of further improving learning effect relative to prior ones.SOLUTION: A lever experiment tool comprises: a base 20; a pillar 30 erected on the base; an arm 40 rotatably attached in the vicinity of an upper end of the pillar; a fulcrum hole 60 which is bored at a center in a longitudinal direction of the arm; a fulcrum shaft 50 composed of a shaft part 50B which is formed so as to protrude in a direction orthogonal to the longitudinal direction of the pillar and has an outer diameter shorter than an inner diameter of the fulcrum hole of the arm and thereby be inserted in the fulcrum hole of the arm, and a shaft head part 50C having an outer diameter longer than the inner diameter of the fulcrum hole of the arm; a plurality of weights 70 to be hooked on the arm; and arm fixing means 100 to 130 provided in the vicinity of the fulcrum shaft of the pillar.SELECTED DRAWING: Figure 1

Description

本発明は、てこ実験器に関する。   The present invention relates to a lever experimental device.

従来、小学校の理科の実験などで使用される実験用てことして、種々のてこ実験器が開発及び提案されている（例えば、特許文献１参照）。   Conventionally, various lever experimental devices have been developed and proposed for experiments used in elementary school science experiments and the like (see, for example, Patent Document 1).

実用新案登録第３２０８６８３号公報Utility model registration No. 3608683

本発明は、従来と比較して一段と学習効果を向上させることができるてこ実験器を提供することを目的とする。   It is an object of the present invention to provide a lever experimental device that can further improve the learning effect as compared with the prior art.

本発明の一態様によるてこ実験器は、
基台と、
前記基台上に立設された支柱と、
前記支柱の上端付近に回動自在に取り付けられたアームと、
前記アームの長手方向における中央部分に穿設された支点孔と、
前記支柱の上端付近に、前記支柱の長手方向と直交する方向に突出するようにして形成され、前記アームの前記支点孔の内径より短い外径を有することにより、前記アームの前記支点孔に挿通された軸部と、前記軸部の先端に設けられ、前記アームの前記支点孔の内径より長い外径を有する軸頭部とからなる支点軸と、
前記アームに掛けるための複数の重りと、
前記支柱の前記支点軸付近に設けられたアーム固定手段と
を備える。 A leverage experiment apparatus according to an aspect of the present invention is provided.
The base,
A support column erected on the base;
An arm pivotably mounted near the upper end of the column;
A fulcrum hole drilled in a central portion in the longitudinal direction of the arm;
It is formed in the vicinity of the upper end of the column so as to protrude in a direction orthogonal to the longitudinal direction of the column, and has an outer diameter shorter than the inner diameter of the fulcrum hole of the arm, thereby being inserted into the fulcrum hole of the arm. A fulcrum shaft comprising a shaft portion formed and a shaft head provided at the tip of the shaft portion and having an outer diameter longer than an inner diameter of the fulcrum hole of the arm;
A plurality of weights for hanging on the arm;
Arm fixing means provided near the fulcrum shaft of the column.

本発明のてこ実験器によれば、従来と比較して一段と学習効果を向上させることができる。   According to the lever experimental device of the present invention, the learning effect can be further improved as compared with the prior art.

本発明の実施の形態によるてこ実験器の構成を示す正面図及び縦断面図である。It is the front view and longitudinal cross-sectional view which show the structure of the lever experimental device by embodiment of this invention.

以下、本発明の実施の形態について図面を参照して説明する。   Hereinafter, embodiments of the present invention will be described with reference to the drawings.

図１は、本発明の実施の形態によるてこ実験器１０の構成を示す。このうち、図１（ａ）は、てこ実験器１０の正面図を示し、図１（ｂ）及び図１（ｃ）は、図１（ａ）中のＡ−Ａ’線に沿って切断した場合における縦断面図を示す。   FIG. 1 shows a configuration of a lever experiment device 10 according to an embodiment of the present invention. Among these, Fig.1 (a) shows the front view of the lever experimental device 10, and FIG.1 (b) and FIG.1 (c) cut | disconnected along the AA 'line in Fig.1 (a). The longitudinal cross-sectional view in a case is shown.

てこ実験器１０は、基台２０上に立設された支柱３０の上端付近に、アーム４０を回動自在に取り付けることにより構成されている。   The lever experiment device 10 is configured by rotatably mounting an arm 40 in the vicinity of the upper end of a support column 30 erected on a base 20.

すなわち、支柱３０の上端付近には、てこの支点として機能する支点軸５０が、支柱３０の長手方向と直交する方向に突出するようにして形成されている。一方、アーム４０の長手方向における中央部分には、支点軸５０を挿通するための支点孔６０が穿設されている。   That is, a fulcrum shaft 50 that functions as a fulcrum of the lever 30 is formed in the vicinity of the upper end of the column 30 so as to protrude in a direction orthogonal to the longitudinal direction of the column 30. On the other hand, a fulcrum hole 60 for inserting the fulcrum shaft 50 is formed in the central portion of the arm 40 in the longitudinal direction.

この支点軸５０は、軸支持部５０Ａと、軸部５０Ｂと、軸頭部５０Ｃとを有する。このうち、軸支持部５０Ａは、支柱３０に固着され、アーム４０の支点孔６０の内径より長い外径を有するように形成されている。   The fulcrum shaft 50 includes a shaft support portion 50A, a shaft portion 50B, and a shaft head portion 50C. Among these, the shaft support portion 50 </ b> A is fixed to the support column 30 and is formed to have an outer diameter longer than the inner diameter of the fulcrum hole 60 of the arm 40.

軸部５０Ｂは、軸支持部５０Ａの中央部分から突出するようにして軸支持部５０Ａに一体成形され、アーム４０の支点孔６０の内径より短い外径を有するように形成されている。これにより、軸部５０Ｂは、アーム４０の支点孔６０に挿通される。   The shaft portion 50B is integrally formed with the shaft support portion 50A so as to protrude from the central portion of the shaft support portion 50A, and has an outer diameter shorter than the inner diameter of the fulcrum hole 60 of the arm 40. Thus, the shaft portion 50B is inserted through the fulcrum hole 60 of the arm 40.

軸頭部５０Ｃは、軸部５０Ｂの先端に一体的に形成され、アーム４０の支点孔６０の内径より長い外径を有するように形成されている。これにより、アーム４０が支点軸５０から外れることを防止している。   The shaft head portion 50 </ b> C is integrally formed at the tip of the shaft portion 50 </ b> B and has an outer diameter longer than the inner diameter of the fulcrum hole 60 of the arm 40. This prevents the arm 40 from coming off the fulcrum shaft 50.

このようにして、アーム４０は、支点軸５０を支点として、支柱３０に回動自在に取り付けられている。   Thus, the arm 40 is rotatably attached to the support column 30 with the fulcrum shaft 50 as a fulcrum.

アーム４０には、重り７０を掛けるための複数の引掛孔８０が、アーム４０の長手方向に沿って一定間隔毎にそれぞれ穿設されている。   In the arm 40, a plurality of hooking holes 80 for hanging the weight 70 are formed at regular intervals along the longitudinal direction of the arm 40.

重り７０は、重り本体７０Ａと、重り本体７０Ａの両端に設けられた釣針状のフック７０Ｂ及び７０Ｃとを有する。これにより、アーム４０の引掛孔８０に、重り７０のフック７０Ｂを掛けたり、引掛孔８０に掛けられた重り７０のフック７０Ｃに、別の重り７０のフック７０Ｂを掛けることにより、てこの実験を行い得るようになされている。   The weight 70 includes a weight main body 70A and hooks 70B and 70C in the shape of hooks provided at both ends of the weight main body 70A. Thus, the lever 70 is hooked on the hook hole 80 of the arm 40, or the hook 70B of the weight 70 hooked on the hook 70C is hooked on the hook 70B of the weight 70. It is made to be able to do.

支柱３０の上端には、アーム４０の回転を止めるための右側ストッパ９０Ａ及び左側ストッパ９０Ｂが設けられている。   A right stopper 90 </ b> A and a left stopper 90 </ b> B for stopping the rotation of the arm 40 are provided at the upper end of the column 30.

すなわち、右側ストッパ９０Ａは、アーム４０の上方で、アーム４０の右側部分と立体交差するように、支柱３０の上端から延設されている。同様に、左側ストッパ９０Ｂは、アーム４０の上方で、アーム４０の左側部分と立体交差するように、支柱３０の上端から延設されている。   That is, the right stopper 90 </ b> A extends from the upper end of the support column 30 so as to three-dimensionally intersect the right portion of the arm 40 above the arm 40. Similarly, the left stopper 90 </ b> B extends from the upper end of the support column 30 so as to three-dimensionally intersect the left portion of the arm 40 above the arm 40.

また、これら右側及び左側ストッパ９０Ａ及び９０Ｂは、いずれも、アーム４０と立体交差する部分が上方に湾曲するように形成されている。   Further, both the right and left stoppers 90A and 90B are formed so that the portion that three-dimensionally intersects with the arm 40 is curved upward.

これにより、てこの実験を行う際に、力のつり合いがとれず、アーム４０が傾いて回転しようとした場合であっても、右側ストッパ９０Ａ又は左側ストッパ９０Ｂによって、アーム４０の回転を止めることができる。   Thereby, when performing the experiment, even if the balance of force is not balanced and the arm 40 is inclined to rotate, the rotation of the arm 40 can be stopped by the right stopper 90A or the left stopper 90B. it can.

本実施の形態の場合、支柱３０のうち、支点軸５０の直下には、アーム４０を固定する固定用ピン１００を挿通するためのガイド孔１１０が穿設されている。同様に、アーム４０のうち、支点孔６０の直下には、固定用ピン１００を挿通するための固定用孔１２０が穿設されている。   In the case of the present embodiment, a guide hole 110 through which the fixing pin 100 for fixing the arm 40 is inserted is formed in the support column 30 immediately below the fulcrum shaft 50. Similarly, a fixing hole 120 through which the fixing pin 100 is inserted is formed in the arm 40 directly below the fulcrum hole 60.

固定用ピン１００は、ピン頭部１００Ａと、ピン軸部１００Ｂとを有し、アーム４０を固定するために使用される。ピン軸部１００Ｂは、支柱３０のガイド孔１１０の内径より短い外径を有すると共に、アーム４０の固定用孔１２０の内径より短い外径を有するように形成される。これにより、ピン軸部１００Ｂは、支柱３０のガイド孔１１０及びアーム４０の固定用孔１２０に挿通される。   The fixing pin 100 has a pin head portion 100A and a pin shaft portion 100B, and is used for fixing the arm 40. The pin shaft portion 100B is formed to have an outer diameter shorter than the inner diameter of the guide hole 110 of the support column 30 and an outer diameter shorter than the inner diameter of the fixing hole 120 of the arm 40. Accordingly, the pin shaft portion 100B is inserted into the guide hole 110 of the support column 30 and the fixing hole 120 of the arm 40.

ピン軸部１００Ｂの両端のうち、支柱３０の非アーム取付面側に位置する一端には、ピン頭部１００Ａが一体的に形成されている。ピン頭部１００Ａは、支柱３０のガイド孔１１０の内径より長い外径を有するように形成され、これにより、実験者が固定用ピン１００を押し出す際にストッパとして機能する（図１（ｂ））。   Of both ends of the pin shaft portion 100B, a pin head portion 100A is integrally formed at one end located on the non-arm mounting surface side of the column 30. The pin head 100A is formed so as to have an outer diameter longer than the inner diameter of the guide hole 110 of the support column 30, and thereby functions as a stopper when the experimenter pushes out the fixing pin 100 (FIG. 1B). .

ピン軸部１００Ｂの長手方向における長さは、支点軸５０の突出方向における、支柱３０の長さ（厚さ）と、支点軸５０のうち軸支持部５０Ａ及び軸部５０Ｂの長さとの合計の長さより長くなるように形成されている。   The length of the pin shaft portion 100B in the longitudinal direction is the sum of the length (thickness) of the support column 30 and the length of the shaft support portion 50A and the shaft portion 50B of the fulcrum shaft 50 in the protruding direction of the fulcrum shaft 50. It is formed to be longer than the length.

また、ピン軸部１００Ｂの先端から、アーム４０の厚さより長い長さの位置であって、かつ支点軸５０の軸支持部５０Ａの長さより短い長さの位置には、抜け防止用リング１３０が、ピン軸部１００Ｂの周囲に沿って、ピン軸部１００Ｂに一体的に形成されている。   Further, a removal preventing ring 130 is located at a position longer than the thickness of the arm 40 from the tip of the pin shaft portion 100B and shorter than the length of the shaft support portion 50A of the fulcrum shaft 50. The pin shaft portion 100B is integrally formed along the periphery of the pin shaft portion 100B.

この抜け防止用リング１３０は、支柱３０のガイド孔１１０の内径より長い外径を有するように形成され、これにより、実験者が固定用ピン１００を引き抜く際にストッパとして機能する（図１（ｃ））。なお、抜け防止用リング１３０は、例えばＣ状のリングや環状のリングなど、他の種々の形状を適用することができる。   This drop prevention ring 130 is formed so as to have an outer diameter longer than the inner diameter of the guide hole 110 of the support column 30, thereby functioning as a stopper when the experimenter pulls out the fixing pin 100 (FIG. 1C )). Note that various other shapes such as a C-shaped ring and an annular ring can be applied to the drop prevention ring 130.

このように本実施の形態によれば、固定用ピン１００を押し出して、固定用ピン１００をアーム４０の固定用孔１２０に挿通させれば（図１（ｂ））、力のつり合いがとれていない場合であっても、アーム４０を水平状態に固定することができるのに対して、固定用ピン１００を引き抜いて、固定用ピン１００をアーム４０の固定用孔１２０から外せば（図１（ｃ））、実際の力のつり合いの状態を確認することができる。   As described above, according to the present embodiment, if the fixing pin 100 is pushed out and the fixing pin 100 is inserted into the fixing hole 120 of the arm 40 (FIG. 1B), the balance of force is balanced. Even if not, the arm 40 can be fixed in a horizontal state, but if the fixing pin 100 is pulled out and the fixing pin 100 is removed from the fixing hole 120 of the arm 40 (FIG. 1 ( c)) The actual balance of forces can be confirmed.

具体的な実験方法としては、まず、アーム４０を固定した状態で（図１（ｂ））、実験者同士で話し合いながら予測を行い、重り７０を掛ける。その後、固定用ピン１００を引き抜くことにより（図１（ｃ））、予測の適否について実験をして確認する。予測が誤っていた場合には、再度、アーム４０を固定し（図１（ｂ））、重り７０を掛け直す。このようにして、てこの原理を理解できるまで、実験者同士で話し合いながら、繰り返し実験を行うことができる。 As a specific experimental method, first, with the arm 40 fixed (FIG. 1B), prediction is performed while talking between the experimenters, and a weight 70 is applied. Thereafter, by pulling out the fixing pin 100 (FIG. 1C), an experiment is performed to confirm whether the prediction is appropriate. If the prediction is incorrect, the arm 40 is fixed again (FIG. 1 (b)) and the weight 70 is applied again. In this way, it is possible to repeatedly perform experiments while discussing between the experimenters until the principle of leverage can be understood.

従って、本実施の形態のてこ実験器１０によれば、従来と比較して一段と学習効果を向上させることができる。   Therefore, according to the lever experiment device 10 of the present embodiment, the learning effect can be further improved as compared with the conventional case.

すなわち、本実施の形態のてこ実験器１０は、基台２０と、基台２０上に立設された支柱３０と、支柱３０の上端付近に回動自在に取り付けられたアーム４０と、アーム４０の長手方向における中央部分に穿設された支点孔６０と、支柱３０の上端付近に、支柱３０の長手方向と直交する方向に突出するようにして形成され、アーム４０の支点孔６０の内径より長い外径を有する軸支持部５０Ａと、軸支持部５０Ａの中央部分から突出するようにして軸支持部５０Ａに一体成形され、アーム４０の支点孔６０の内径より短い外径を有することにより、アーム４０の支点孔６０に挿通された軸部５０Ｂと、軸部５０Ｂの先端に一体成形され、アーム４０の支点孔６０の内径より長い外径を有する軸頭部５０Ｃとからなる支点軸５０と、アーム４０にアーム４０の長手方向に沿って一定間隔毎にそれぞれ穿設された複数の引掛孔８０と、引掛孔８０に掛けるための複数の重り７０と、アーム４０の上方で、アーム４０の右側及び左側部分とそれぞれ立体交差するように、支柱３０の上端からそれぞれ延設され、アーム４０と立体交差する部分がそれぞれ上方に湾曲するように形成された右側及び左側ストッパ９０Ａ及び９０Ｂと、支柱３０のうち支点軸５０の直下に穿設されたガイド孔１１０と、アーム４０のうち支点孔６０の直下に穿設された固定用孔１２０と、支柱３０のガイド孔１１０の内径より短い外径を有すると共に、アーム４０の固定用孔１２０の内径より短い外径を有し、支柱３０のガイド孔１１０及びアーム４０の固定用孔１２０に挿通されたピン軸部１００Ｂと、ピン軸部１００Ｂの両端のうち、支柱３０の非アーム取付面側に位置する一端に一体成形され、支柱３０のガイド孔１１０の内径より長い外径を有するピン頭部１００Ａとからなり、ピン軸部１００Ｂの長手方向における長さは、支点軸５０の突出方向における、支柱３０の長さと、支点軸５０のうち軸支持部５０Ａ及び軸部５０Ｂの長さとの合計の長さより長くなるように形成された固定用ピン１００と、ピン軸部１００Ｂの先端から、アーム４０の厚さより長い長さの位置であって、かつ支点軸５０の軸支持部５０Ａの長さより短い長さの位置に、ピン軸部１００Ｂの周囲に沿って、ピン軸部１００Ｂに一体的に形成され、支柱３０のガイド孔１１０の内径より長い外径を有する抜け防止用リング１３０とを備える。   That is, the lever experiment device 10 of the present embodiment includes a base 20, a support column 30 erected on the support base 20, an arm 40 that is rotatably mounted near the upper end of the support column 30, and an arm 40. The fulcrum hole 60 drilled in the central part in the longitudinal direction of the support column 30 is formed in the vicinity of the upper end of the support column 30 so as to protrude in a direction perpendicular to the longitudinal direction of the support column 30, and from the inner diameter of the fulcrum hole 60 of the arm 40 A shaft support portion 50A having a long outer diameter and a shaft support portion 50A integrally molded so as to protrude from the central portion of the shaft support portion 50A, and having an outer diameter shorter than the inner diameter of the fulcrum hole 60 of the arm 40, A fulcrum shaft 50 including a shaft portion 50B inserted into the fulcrum hole 60 of the arm 40, and a shaft head portion 50C integrally formed at the tip of the shaft portion 50B and having an outer diameter longer than the inner diameter of the fulcrum hole 60 of the arm 40; , Arm 4 A plurality of hooking holes 80 respectively drilled at regular intervals along the longitudinal direction of the arm 40, a plurality of weights 70 for hanging on the hooking hole 80, and on the right and left sides of the arm 40 above the arm 40 Right and left stoppers 90A and 90B that are respectively extended from the upper end of the support column 30 so as to be three-dimensionally crossed with each other, and are formed so that the portions that three-dimensionally intersect with the arm 40 are curved upward, The guide hole 110 drilled immediately below the fulcrum shaft 50, the fixing hole 120 drilled directly below the fulcrum hole 60 in the arm 40, and an outer diameter shorter than the inner diameter of the guide hole 110 of the column 30. A pin shaft portion 100B having an outer diameter shorter than the inner diameter of the fixing hole 120 of the arm 40 and inserted through the guide hole 110 of the support column 30 and the fixing hole 120 of the arm 40; Of the both ends of the shaft portion 100B, the pin shaft portion is formed integrally with one end located on the non-arm mounting surface side of the support column 30 and has an outer diameter longer than the inner diameter of the guide hole 110 of the support column 30. The length in the longitudinal direction of 100B is formed to be longer than the total length of the length of the support column 30 in the protruding direction of the fulcrum shaft 50 and the length of the shaft support portion 50A and the shaft portion 50B of the fulcrum shaft 50. The pin shaft is located at a position longer than the thickness of the arm 40 and shorter than the length of the shaft support portion 50A of the fulcrum shaft 50 from the tip of the fixing pin 100 and the pin shaft portion 100B. A ring prevention ring 130 that is integrally formed with the pin shaft portion 100B along the periphery of the portion 100B and has an outer diameter longer than the inner diameter of the guide hole 110 of the support column 30 is provided.

なお、上述の実施の形態においては、軸支持部５０Ａと、軸部５０Ｂと、軸頭部５０Ｃとによって、支点軸５０を形成した場合について述べたが、本発明はこれに限らず、軸支持部５０Ａを設けることなく、軸部５０Ｂを支柱３０に直接接続し、軸部５０Ｂと、軸頭部５０Ｃとによって、支点軸５０を形成するようにしても良い。   In the above-described embodiment, the case where the fulcrum shaft 50 is formed by the shaft support portion 50A, the shaft portion 50B, and the shaft head portion 50C has been described. However, the present invention is not limited thereto, and the shaft support portion is not limited thereto. The shaft portion 50B may be directly connected to the support column 30 without providing the portion 50A, and the fulcrum shaft 50 may be formed by the shaft portion 50B and the shaft head portion 50C.

また、上述の実施の形態においては、アーム４０に穿設された引掛孔８０に重り７０を掛ける場合について述べたが、本発明はこれに限らず、例えばアーム４０の長手方向に沿って一定間隔毎に設けられた釣針状のフックに、重り７０を掛けるようにしても良い。   In the above-described embodiment, the case where the weight 70 is applied to the hooking hole 80 formed in the arm 40 has been described. However, the present invention is not limited to this, and for example, a constant interval is provided along the longitudinal direction of the arm 40. A weight 70 may be hung on a hook formed in each hook.

また、上述の実施の形態においては、アーム固定手段として、固定用ピン１００と、ガイド孔１１０と、固定用孔１２０と、抜け防止用リング１３０とからなるアーム固定手段１００〜１３０を適用した場合について述べたが、本発明はこれに限らず、支柱３０の支点軸５０付近に設けられた他の種々のアーム固定手段を適用するようにしても良い。   In the above-described embodiment, when the arm fixing means 100 to 130 including the fixing pin 100, the guide hole 110, the fixing hole 120, and the removal preventing ring 130 is applied as the arm fixing means. However, the present invention is not limited to this, and various other arm fixing means provided near the fulcrum shaft 50 of the support column 30 may be applied.

すなわち、この場合、てこ実験器１０は、基台２０と、基台２０上に立設された支柱３０と、支柱３０の上端付近に回動自在に取り付けられたアーム４０と、アーム４０の長手方向における中央部分に穿設された支点孔６０と、支柱３０の上端付近に、支柱３０の長手方向と直交する方向に突出するようにして形成され、アーム４０の支点孔６０の内径より短い外径を有することにより、アーム４０の支点孔６０に挿通された軸部５０Ｂと、軸部５０Ｂの先端に設けられ、アーム４０の支点孔６０の内径より長い外径を有する軸頭部５０Ｃとからなる支点軸５０と、アームに掛けるための複数の重り７０と、支柱３０の支点軸５０付近に設けられたアーム固定手段１００〜１３０とを備える。   That is, in this case, the lever experiment device 10 includes a base 20, a support column 30 erected on the support base 20, an arm 40 rotatably attached to the vicinity of the upper end of the support column 30, and the length of the arm 40. A fulcrum hole 60 drilled in the central portion in the direction, and formed in the vicinity of the upper end of the support column 30 so as to protrude in a direction orthogonal to the longitudinal direction of the support column 30 and shorter than the inner diameter of the fulcrum hole 60 of the arm 40 By having the diameter, the shaft portion 50B inserted through the fulcrum hole 60 of the arm 40, and the shaft head portion 50C provided at the tip of the shaft portion 50B and having an outer diameter longer than the inner diameter of the fulcrum hole 60 of the arm 40, A fulcrum shaft 50, a plurality of weights 70 for hanging on the arm, and arm fixing means 100 to 130 provided in the vicinity of the fulcrum shaft 50 of the support column 30.

１０ てこ実験器
２０ 基台
３０ 支柱
４０ アーム
５０ 支点軸
６０ 支点孔
７０ 重り
８０ 引掛孔
９０ ストッパ
１００ 固定用ピン
１１０ ガイド孔
１２０ 固定用孔
１３０ 抜け防止用リング

DESCRIPTION OF SYMBOLS 10 Lever experimental apparatus 20 Base 30 Support | pillar 40 Arm 50 Supporting shaft 60 Supporting hole 70 Weight 80 Hooking hole 90 Stopper 100 Fixing pin 110 Guide hole 120 Fixing hole 130 Ring prevention ring

Claims (1)

基台と、
前記基台上に立設された支柱と、
前記支柱の上端付近に回動自在に取り付けられたアームと、
前記アームの長手方向における中央部分に穿設された支点孔と、
前記支柱の上端付近に、前記支柱の長手方向と直交する方向に突出するようにして形成され、前記アームの前記支点孔の内径より短い外径を有することにより、前記アームの前記支点孔に挿通された軸部と、前記軸部の先端に設けられ、前記アームの前記支点孔の内径より長い外径を有する軸頭部とからなる支点軸と、
前記アームに掛けるための複数の重りと、
前記支柱の前記支点軸付近に設けられたアーム固定手段と
を備えることを特徴とするてこ実験器。

The base,
A support column erected on the base;
An arm pivotably mounted near the upper end of the column;
A fulcrum hole drilled in a central portion in the longitudinal direction of the arm;
It is formed in the vicinity of the upper end of the column so as to protrude in a direction orthogonal to the longitudinal direction of the column, and has an outer diameter shorter than the inner diameter of the fulcrum hole of the arm, thereby being inserted into the fulcrum hole of the arm. A fulcrum shaft comprising a shaft portion formed and a shaft head provided at the tip of the shaft portion and having an outer diameter longer than an inner diameter of the fulcrum hole of the arm;
A plurality of weights for hanging on the arm;
An arm fixing means provided in the vicinity of the fulcrum shaft of the support column.

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110634363A (en) * 2019-10-31 2019-12-31 韩沐林 Teaching aid for physical mechanics experiments in junior middle school

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS54157696U (en) * 1978-04-26 1979-11-02
JP3088142U (en) * 2002-02-22 2002-08-30 昭和教材株式会社 Leverage balance device for teaching materials
JP3208683U (en) * 2016-11-17 2017-02-02 厚佳 磯貝 Lever-shaped teaching materials

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS54157696U (en) * 1978-04-26 1979-11-02
JP3088142U (en) * 2002-02-22 2002-08-30 昭和教材株式会社 Leverage balance device for teaching materials
JP3208683U (en) * 2016-11-17 2017-02-02 厚佳 磯貝 Lever-shaped teaching materials

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110634363A (en) * 2019-10-31 2019-12-31 韩沐林 Teaching aid for physical mechanics experiments in junior middle school

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