JPS602400A - Elliptic motion instrument - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an ellipse delineator using a thread, and more generally to an ellipse motion device.

Patent No. 956,200 by the present applicant describes an ellipse delineator that uses a thread to draw an ellipse according to the mathematical theorem that a locus with a constant sum of distances from two points is an ellipse. The problem solved in this patent is that, as is well known, when attempting to draw an ellipse using thread, the thread twists. To explain this with reference to Figure 1 of the drawing, for example, if you fix the two ends A and B of a single thread, and then hang the thread around a pencil and rotate it, an intersection as shown at C will occur. be. The ellipse delineator according to the invention of Patent No. 956200 will be briefly explained as follows. As shown in FIG. A wheel (5) is rotatably attached to one end of the arm.

The edge of the lug plate (2) has a friction member (
3) is attached, the length of which is enough to turn the wheel (5) at least half a turn.

The arm (4) has a member (
7) is attached, and the center of the writing instrument is a car (5)
A member (7) is placed just below the hook (6) for hanging the thread attached to the hook.

The ellipse delineator described in this patent No. 956200 can be used at point A if the length of the friction member is made equal to the circumference of the wheel (5).
, B has the advantage that the thread will never twist no matter how many times it revolves around it.

Such an ellipse drawer has a complicated structure, increases the manufacturing cost, and the writing instrument cannot be made very long because the writing instrument is attached so that it is placed under the wheel (5). For example, if the yoke is too long, the error will increase if the axis (1) tilts slightly from the perpendicular direction to the surface of the blackboard while drawing the ellipse. If you shorten the yoke in an attempt to reduce the error caused by the tilt of the shaft, you will immediately have to replace the yoke. A similar problem occurs when holding something such as a pencil. The structure is simple, and long writing utensils can be attached to it.
However, there was a desire for an ellipse delineator with fewer errors.

The object of the present invention is to provide an ellipse delineator, broadly speaking, an ellipse motion device, that satisfies such wishes.

The present invention allows twisting of the thread during one revolution by passing the thread in a specific direction through a hole that is made in a direction parallel to the axis perpendicular to the surface of the ellipse. It is based on the discovery that it is possible to draw an ellipse. This fact will now be explained using drawings.

Figure 3 shows an elliptical machine in which a lug plate with a hole (13) (the lower opening is indicated by D and the upper opening by E) is rotatably mounted on the shaft (11). has been done. If the thread revolves in the direction shown by the arrow below, passing from point S to point P on the extension of AB, and in such a way that thread AD passes below thread BE, then Pass it through the hole so that it passes through opening E and goes to B. In this way, the thread will not twist even when it reaches point C.

The thread can be prevented from twisting by passing it through a hole made perpendicularly to the drawn elliptical surface. This means that in the threading method shown in Figure 1, the thread is passed through the drawn ellipsoidal surface. You can see that the way the thread is threaded is in stark contrast to the fact that the pencil is turned in a parallel direction.

Furthermore, if the direction of revolution is S→P→C as shown by the arrow below, and if the thread AD is to revolve below the thread BE, as shown in Figure 4, if When a thread is passed from the upper opening E to the lower opening D of the hole, after passing through P the thread will be twisted as shown at C in the same figure. Therefore, for the revolution state, the thread from A must pass through the hole from D to E and go to B, as shown in FIG. If the revolution direction is in the direction F', which goes from the position S shown in Figure 3 to C through point P' on the extension of BA, the thread from A passes through the hole from E to D. It must be made to go to street B (exactly as shown at S in Figure 4). (The thread BD revolves under the thread AE.)

For each revolution, there is only one way to pass the thread through the hole so that the thread does not get twisted during that revolution.

Due to this, it is possible to draw an ellipse without twisting the thread within one revolution.

When attaching a writing utensil, as shown in Figures 5 and 6, place a writing utensil such as a pencil lead (1 liter) near the hole (B).
4) Drill a hole through which the pencil lead can be passed diagonally, so that it can be fixed so that the tip of the pencil lead is just below the hole (13). Due to this, if the tip of the pencil lead becomes worn out, you can press it one by one to get the lead out. In this way, a long writing instrument can be used so that when the tip wears out, the writing instrument only needs to be pushed out without having to be replaced every time. This is an advantage that cannot be obtained with Patent No. 956,200.

Furthermore, since the distance between the hole through which the thread passes and the tip of the writing instrument can be made smaller, the error due to the inclination of the shaft can be made smaller than that of Patent No. 956,200.

If the error is not a problem, the writing instrument should be
3), parallel to its hole and perpendicular to the lug plate (13).

The writing instrument may be attached to the lug plate by any member other than the hole.

The lug plate may be very thin and the holes may be made of wire-like material.

The elliptical exerciser of the present invention can be used not only for drawing an ellipse with a writing instrument attached, but also for making an elliptical movement by attaching something to any place on the elliptical exerciser. You'll understand.

The ellipse delineator of Patent No. 956200 can prevent the thread from twisting no matter how many times it is revolved. In contrast, the ellipse delineator of the present application can only make one revolution. However, if it is difficult to draw an ellipse, one revolution is usually sufficient. Therefore, the purpose can be fully achieved with the ellipse delineator of the present application.

[Brief explanation of drawings]

FIG. 1 is a diagram showing a problem that occurs when drawing an ellipse using thread. FIG. 2 is a diagram of the ellipse delineator of Patent No. 956200. FIG. 3 is a diagram showing the principle of the elliptical motion machine of the present invention. FIG. 4 is a diagram for explaining how to pass the thread through the hole. FIG. 5 is a perspective view of one embodiment of an ellipse delineator according to the present invention. FIG. 6 is a side view, partially in section, of the ellipse delineator of FIG. 5. 11-shaft, 12-lug plate, 13-hole. Patent applicant Mikio Ito

Claims (1)

[Claims] A lug plate mounted for rotation in a plane perpendicular to the axis and having a hole in the direction parallel to the axis so that the tip of the writing instrument can be placed directly below or near the hole if necessary.
An elliptical exercise machine consisting of a lug plate to which a writing instrument can be attached