Rolling pendulum

Abstract

The invention discloses a rolling pendulum. The rolling pendulum comprises a cross beam in which a left oillet and a right oillet are formed, a rotating shaft in which a left oillet and a right oillet are formed, and wires which pass through the corresponding oillets in the cross beam and the rotating shaft to suspend the rotating shaft and a bearing wheel, and is characterized in that: the inner walls of the oillets in the cross beam and the surface of the cross beam have smooth arc shapes; and the inner walls of the oillets in the rotating shaft and the surface of the rotating shaft also have smooth arc shapes. By adoption of the structure, contact areas between the wires and the oillets are increased remarkably, born pressure is reduced obviously and a trouble that the wires are easy to break is solved.

Description

Technical field [0001] The invention relates to a physics teaching instrument, especially a rolling pendulum. Background technique [0002] Such as figure 1 As shown, the rolling pendulum used in the existing physics teaching includes: a bracket 1, a beam 2 fixed horizontally by the bracket, a rotating shaft 4 suspended by a silk thread 3 under the beam 2, and a heavy wheel 5 fixed in the middle of the rotating shaft 4 . There are two holes 6 on both sides of the crossbeam 2, namely the left eyelet 61 and the right eyelet 62 of the crossbeam; [0003] The existing rolling thread is easy to break, and it is often necessary to replace the thread after one or two classes, which brings a lot of trouble to the teacher; if the thread is broken in class, the experiment cannot be carried out , I have to make up for the experiment in class next time. The applicant once used left and right thread (white thread), fishing thread, the thread of mending leather shoes and other silk thr...

AI Technical Summary

Problems solved by technology

[0004] After observation, the reason why the silk thread is easy to break is: if figure 2 As shown, the hole for the silk thread to pass through is hollow and straight, that is, the inner wall of the hole is in a sharp right-angle shape with the beam or the surface of the rotating shaft, the force-bearing area is small, and the pressure of the silk thread is too high, so it is easy to break

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