JPH0746945Y2 - Pendulum for teaching materials - Google Patents

Description

[Detailed description of the device]

[0001]

FIELD OF THE INVENTION The present invention relates to an experimental pendulum used as a science teaching material for elementary school students.

[0002]

2. Description of the Related Art Pendulum experiments are introduced in the science course of an elementary school, and the teaching materials are selected so that the relationship between the weight of the pendulum, the vibration radius, the amplitude, and the period of simple vibration can be understood.

A conventional pendulum teaching material is a simple one in which a weight is hung with a thread and the upper end of the thread is hooked on a shaft such as a nail to measure the relationship between the thread length and the vibration cycle.

[0004]

[Problems to be solved by the invention] However, the period T of a simple vibration
= 2π (g / l) × 1/2 is not related to the weight and amplitude of the weight, and is to be understood that it is inversely proportional to the square root of the length of the thread. Although it was necessary to change the length and tie the shaft and the weight again, it was difficult for the students to tie the thread, and it took more time to tie the thread than the original vibration test.

[0005]

According to the present invention, a shaft (7) is horizontally projected on an upper part of a column (3) and has a projection (9) orthogonal to the direction of the shaft (7). The bearing (10) is rotatably fitted on the shaft (7), and the upper end of the pipe (12) is inserted into the protrusion (9) of the bearing (10) to detachably fix the pipe (12) to the bearing (10). At the same time, insert the weight attachment piece (15) and the protrusion (14) of the fixture (13) having the protrusion (14) extending upward to the lower end of the pipe (12) to attach the fixture (13). The pipe (12) is detachably fixed to the lower end thereof, and the weight (17) is attached to the attachment piece (15) of the attachment (13).

[0006]

[Operation] The pipe (12) represents the radius of vibration. The pipe (12) is only inserted and fixed in the protrusion (9) of the bearing (10) and the protrusion (14) of the fixture (13) so that the pipe (12) can be removed to have a different length. It is extremely easy to replace it with another one or cut it to an appropriate length and insert it again into the protrusions (9) (14) to mount it.

Further, the weight (17) having a different weight is replaced with the fixture (13), or the weight (17) and the fixture (1).
The weight can be changed by replacing 3) as a set and replacing it with the pipe (12).

[0008]

EXAMPLE A support pole fitting (2) is fitted on a stand (1), and a support pole (3) is detachably fitted on the support pole fitting (2).

On the pillar (3), an angle measuring plate (5) having an angle scale on the surface and a mounting ring (4) for fitting the pillar on the back is provided in a vertical plane. On the angle measuring plate (5), a cylinder (6) for standing the shaft (7) is projected at the center of the angle scale and both sides thereof, and the shaft (7) is set up on the central cylinder (6) to support the column. (3)
To project horizontally.

The shaft (7) is rotatably fitted with a bearing (10) in which a projection (9) is formed on the tubular body (8) at a right angle. If necessary, the same second bearing (10
Fit a) and insert the cap (12) into the tip of the shaft (7) to prevent it from coming off.

The upper end of the soft resin pipe (12) such as vinyl is inserted into the protrusion (9) of the bearing (10) and is detachably fixed to the bearing (10) by the elasticity of the pipe.

At the lower end of the pipe (12), a protrusion (14) protruding from the weight attachment (13) is inserted, and the attachment (13) is detachably fixed by the elasticity of the pipe.

The fitting (13) has a mounting piece (15) in which an elastic plate is bent in an arc shape, and a hanging portion (16) is projected inward at the tip of the mounting piece (15), A weight (17) is detachably attached to the attachment piece (15).

[0014]

[Example of use] If the pipe (12) is raised up to a predetermined height on the angle scale of the angle measuring plate (5) with the shaft (7) as a fulcrum and is released, the bearing (10), the pipe (12) and the fitting (13) ), The weight (17) oscillates with the shaft (7) as a fulcrum, and if the period is measured, it can be tested that the period is constant regardless of the initial pulling height.

If the upper end of the pipe (12) is strongly pulled out from the protrusion (9) and pulled out, the pipe (12) is cut into a short length, and this is inserted into the protrusion (9) again, and a similar period measurement experiment is conducted. It can be seen that the shorter the length of the pipe (12), the shorter the cycle.

The weight (17) of the fixture (13) is replaced with a different weight, or the fixture (13) is pulled out from the lower end of the pipe and the weight (17) having a different weight is attached.
Replacing with, and measuring the cycle, you can experiment with a constant cycle regardless of the weight of the weight.

An axis is set up on another cylinder (6a) projecting from the angle measuring plate (5), and as described above, the bearing (10) and the pipe (12).
Set, attach a weight (17) of the same mass and hang it down, and if one pipe (12) is pulled up and released, the two weights (17) (17) collide at the lower end of the vibration, but the momentum Therefore, it is possible to carry out an experiment to continue simple oscillation without changing the period.

Two bearings (10) on one shaft (7) of the cylinder
When (10a) is attached via the spacer (11),
If one bearing (10) is fitted with a long pipe (12) and the other bearing (10a) is fitted with a short pipe and vibrated at the same time, the difference in cycle and frequency due to the difference in vibration radius can be compared and felt.

The above description of the embodiments is for explaining the present invention, and should not be construed as limiting the invention described in the scope of claims for utility model or reducing the scope. Further, the configuration of each part of the present invention is not limited to the above embodiment, and it is needless to say that various modifications can be made within the technical scope described in the scope of claims for utility model registration.

Since the present invention does not use a thread for attaching the weight, a thread knot is not required and the student can concentrate on the experiment. Further, since the pipe (12) is removably inserted and fixed to the two protrusions (9) and (14), it is easy to replace the pipe and change the pipe length, which is excellent as a teaching material.

[0021]

[Brief description of drawings]

FIG. 1 is a front view.

FIG. 2 is a side view.

FIG. 3 is a perspective view showing a mounting state of a bearing, a pipe, and a fitting.

[Explanation of symbols]

 (3) Post (5) Angle measuring plate (7) Shaft (9) Protrusion (10) Bearing (12) Pipe (13) Fixture (14) Protrusion (15) Mounting piece (17) Weight

Claims (1)

[Scope of utility model registration request] 1. A stanchion (3) is erected on a stand (1), a shaft (7) is horizontally projected on the upper part of the stanchion (3), and a projection ( The bearing (10) having 9) is rotatably fitted on the shaft (7), the upper end of the pipe (12) is inserted into the protrusion (9) of the bearing (10), and the pipe (12) is inserted into the bearing (10). The fitting (13) is detachably fixed, and the projection (14) of the fitting (13) having the weight fitting piece (15) and the projection (14) extending upward is inserted into the lower end of the pipe (12) to mount the fitting. A pendulum for teaching material in which (13) is detachably fixed to the lower end of a pipe (12), and a weight (17) is attached to a mounting piece (15) of the mounting tool (13).