JPS62200202A - Divider for calculating middle point - Google Patents

Abstract

PURPOSE:To make it possible to accurately mark a middle point even without drawing a figure using a compass and a rule, by providing request point adding parts to the foremost end parts of extension levers and the pivotal center point of a link. CONSTITUTION:Request point adding parts 7, 8 are provided by forming the leading ends of extension levers 5, 6 into a needle shape and a request point adding part 9 is constituted by providing up-and-down slide lever 12 to the center of a pivot shaft 11 and, by pressing the upwardly protruded part of said slide lever 12 by a finger, the needle 14 provided to the center of the lower end of the pivot shaft 11 is slightly protruded downwardly from a retracted state to form a needle hole serving as a mark. Further, a rubber ring 15 acting as a spring is provided so as to return the needle 14 after marking to the retracted state. If the foremost ends (a), (b) of the extension levers 5, 6 are opened to be matched with the points A, B indicated on drawing paper for example and the mark is applied by the request point adding part 9, said mark is an intermediate point between two points A, B.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a divider that can easily find the midpoint between two specified points.

[Conventional technology]

A conventional divider is used, for example, to mark two points at a specified interval on a drawing paper.

To find the midpoint between two points at a specified interval, use a compass to draw an arc slightly farther from the midpoint of each point, and draw a bisector by connecting the lower intersection of the two arcs. It was found by subtracting.

However, this method requires the use of two tools, a compass and a ruler, to draw the surface, although it may be said that it is easy to do so, and it is that much more troublesome.

[Problem that the invention seeks to solve]

The present invention provides a divider that can mark the correct midpoint between two specified points on a drawing paper, for example, with a single divider without drawing.

[Means for solving problems]

The present invention solves these drawbacks, and its structure will be described in detail below with reference to the accompanying drawings.

An extension rod 5.6 of the same length is extended and protruded from the adjacent link 1.4 of the parallelogram link H, in which four links 1, 2, and 3.4 of the same length are pivotally connected. The freezing point addition parts 7, 8.9 that make it possible to mark the most extreme points a and b of the extension rod 5.6 and the pivot point C of the link 2.3 are attached to the most extreme part 5 of the extension rod. °.

It is characterized by being provided at 6 degrees and at 2 degrees at the pivot center of the link 2.3.

〔Example〕

When the tip of the extension rod 5.6 is formed into a needle shape, the freezing point adding section 7.8 in the drawings is formed by providing a vertical sliding rod at the center of the pivot shaft 11, and "The illustration shows a case in which the needle 14 attached to the center of the lower end is slightly protruded downward from the retracted state by applying finger pressure on the protruding part 13 in one direction, and a needle hole serving as a mark is made. Any structure may be used as long as it allows marks to be placed on the drawing paper.

In addition, similar freezing point addition parts 1 are also provided at the pivot points of links 1 and 4.
If 0 is provided, the mark added by the freezing point adding section 10 becomes a mark from which a perpendicular line can be drawn, which is convenient.

Reference numeral 15 in the figure is a rubber ring serving as a spring, which is provided so that the needle 14 with the mark returns to the retracted state.

〔how to use〕

This will be explained with reference to the embodiments shown in the drawings.

By opening and closing the leading ends a and b of the extension rod 5.6, for example, align them with point A and point B specified on the drawing paper, and mark the point with the curving section 9, so that the mark will be located between the two specified points AB. It becomes a point.

The fact that this is correct will be explained in FIG.

Let the point where link 2 intersects with links 1 and 5 be point d.

The point where link 3 intersects with links 4 and 6 is defined as 8 points.

Let the pivot point of link 1.4 be point f.

First, prove that sides ac and cf intersect perpendicularly, and sides bc and cf intersect perpendicularly.

In Δcbf, Δcbf=Δbce+Δcef In Δbce and Δcef, edge ce−edge be−edge ef Therefore, Δbee and Δcef are each bisecting king-gons.

Let Ache and 1bce be α.

1ecf, lef c is β.

α+α+β+β=180° 2α+2β=180° 2(α+β)−180° α×β=90° Therefore, side bc and side cf intersect perpendicularly.

The same applies to Δacf, so the sides ac and cf intersect perpendicularly.

In other words, sides ac and bc overlap straight line ab, and side c
This satisfies the condition that f is a perpendicular line to this straight line ab.

Next, prove that side aC==side bc.

In Δacf and Δbcf, 1acf=lbcf=90°side af=side bfside cf=side cf−6= Therefore, Δacf and Δbcf are congruent, and the side ac−side bc.

□ From the above, the mark placed by the freezing point adding section 9 at the pivot center point C will always be the midpoint between the two specified points, A and B, no matter how wide or narrow the divider is. Become.

In addition, the 6 points added by the freezing point adding section 9 and the freezing point adding section 10
If you connect the point f marked with , it becomes the specified two points A
, B is the perpendicular bisector of the straight line connecting B.

〔Effect of the invention〕

The present invention is configured like a double series, so like the conventional one,
Even without drawing using a compass and ruler, just align the leading edges a and b of the extension rods 5 and 6 of the wooden lid with the specified two points A and B, and the freezing point adding section 9 will mark the exact midpoint. This is a very convenient divider that can be used to find the middle point.

[Brief explanation of drawings]

The drawings show one embodiment of the present invention; FIG. 1 is a plan view of a wooden lid, FIG. 2 is a vertical cross-sectional view of the freezing point addition part, and FIG. 3 is an explanatory diagram of the proof. H... Parallelogram link, ■, 2.3.4... Link,
2°... Pivot center, 5.6... Extension rod, 5", 6°.
- Cutting edge section, 7.8.9... Freezing point addition section. February 27, 1985 procedural amendment (voluntary) October 16, 1988 Patent Office Commissioner Akio Kuroda Ship 1 Display of the case 1986 Patent Application No. 42634 2 Name of the invention Divider for finding the midpoint 3 Relationship with the case of the person making the amendment Name of the patent applicant Kata Showa Zōgai 2 persons 5 Date of amendment order Showa year Month Date Patent application
No. 61-42634 Procedural Amendment Regarding the present application, the following portions of the specification are amended. Note: In the fifth line of page 8, the statement ``Figure 3 is an explanatory diagram of the proof.'' was replaced with ``Figure 3 is an explanatory diagram of the proof. It is a perspective view.'' Procedural amendment dated October 16, 1986 (Volunteer 9, 1986 Patent Application No. 42634 2) Divider seeking the middle point of the title of the invention 3. Relationship with the case of the person making the amendment Patent applicant name Shape Showa 5. Amendment order Date of 1984 Month Day 0 Subject of amendment Full text of specification J-115, Patent No. 1983-42634 Procedural amendment details
Title of the invention: Divider 2 for finding the midpoint, claims: Adjacent links 1.4 of a parallelogram link H in which four links 1, 2, 3.4 of the same length are pivotally connected. Extension rods 5 and 6 of the same length are extended and protruded, and it is possible to mark the most extreme points a and b of the extension rods 5 and 6 and the pivot point C of the link 2゜3. Extend the freezing point addition part 7.8.9 to the most extreme part of the rod by 5°. DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention is characterized in that it is provided at 6° and at 2° from the pivot center of the link 2.3. This relates to a divider that can find the midpoint between two points. [Prior Art] A conventional divider is used to mark two points at a specified interval on a drawing paper, for example. To find the midpoint between two points at a specified interval, use a compass to draw an arc a little further from each point than the midpoint, and draw a bisector connecting the upper and lower intersections of the two arcs. That's what I was looking for. However, this method requires the use of two tools, a compass and a ruler, to draw the surface, although it may be said that it is easy to do so, and it is that much more troublesome. [Problems to be Solved by the Invention] The present invention provides a divider that can mark the correct midpoint between two designated points on a drawing paper, for example, without drawing, using a single divider. [Means for Solving the Problems] The present invention solves the above-mentioned drawbacks, and the structure thereof will be described in detail with reference to the accompanying drawings as follows. Extension rods 5 and 6 of the same length are extended and protruded from adjacent links 1.4 of a parallelogram link H in which four links 1, 2, and 3.4 of the same length are pivotally connected. The freezing point addition parts 7, 8.9 that make it possible to mark the most extreme points a and b of the extension rod 5.6 and the pivot point C of the link 2.3 are attached to the most extreme part 5 of the extension rod. °. 6'' and the pivot point 2'' of the link 2.3. [Example] The freezing point addition parts 7 and 8 shown in the drawings are provided by forming the tips of the extension rods 5 and 6 into needle-like shapes. When the freezing point adding part 9 is formed with a vertical slide rod n at the center of the pivot shaft 11, the needle 1 attached to the center of the lower end is formed by applying finger pressure to the upwardly protruding part B of this slide rod.
4 is constructed so that it protrudes a little downward from the retracted state and has a needle hole that serves as a mark, but any other structure may be used as long as it can be used to mark a mark on drawing paper, for example. good. In addition, similar freezing point addition parts 1 are also provided at the pivot points of links 1 and 4.
If 0 is provided, the mark added by the freezing point adding section 10 becomes a mark from which a perpendicular line can be drawn, which is convenient. The reference numeral Takumi in the figure is a rubber ring used as a spring substitute so that the needle 14 with the mark returns to its retracted state. FIG. 4 shows an embodiment (2) using the principles of the present invention. The freezing point addition part 7.8 is the most extreme part of the extension rods 5 and 6 at 5°. 6, and the freezing point adding portion 9 is shown in the case where the tip of the pivot shaft 17 of the hinge 16 is slightly extended to form a needle shape. [How to use] Give a brief explanation of the drawing. If you open and close the ends a and b of the extension rods 5 and 6 to align them with points A and B specified on the drawing paper, and mark them with the point-finding section 9, that mark will be located between the two specified points AB. It becomes a point. The fact that this is correct will be explained in FIG. Let the point where link 2 intersects with links 1 and 5 be point d. Let the point where link 3 and link 4.6 intersect be point e. Let the pivot point of link 1.4 be point f. First, prove that sides ac and cf intersect perpendicularly, and sides bc and cf intersect perpendicularly. In Δcbf, Δcbf−Δbce ten Δcef In Δbce and Δcef, edge ce−edge be−edge ef Therefore, Δbce and Δcef are each a bisecting king triangle. Let Ocbe and 1bce be α. 1ecf, lef c is assumed to be β. α+α+β+β=180°2α+2β−180°2(α+β)−180°α+β−90°Therefore, side bc and side cf intersect perpendicularly. The same applies to Δacf, so the sides ac and cf intersect perpendicularly. In other words, side ac and side bC overlap straight line ab, and side c
This satisfies the condition that f is a perpendicular line to this straight line ab. Next, prove that side ac - side bc. In △acf and △bcf, 1acf=lbcf=900 Side af=side bf Side cf=side cf Therefore, △acf and △bcf are congruent, and side aC==
The side is bc. From the above, the mark placed on the pivot center point C by the finding point addition unit 9 will always be the midpoint between the two specified points, points A and B, no matter how wide or narrow the divider is. Become. In addition, the 0 point added by the point addition section 9 and the point addition section 10
If you connect the point f marked with , it becomes the specified two points A
, B is the perpendicular bisector of the straight line connecting B. [Effects of the Invention] Since the present invention is configured as described above, the extension rod 5 of the wooden lid can be drawn without using a compass and a ruler as in the conventional method.
．． This is an extremely convenient intermediate point divider that allows you to mark the exact intermediate point by simply aligning the most advanced points a and b of 6 with the specified two points A and B using the finding point adding section 9.
becomes. 4. Brief description of the drawings The drawings show one embodiment of the present invention. Fig. 1 is a plan view of the first embodiment, Fig. 2 is a longitudinal sectional view of the first embodiment, and Fig. 3 is a longitudinal sectional view of the first embodiment.
The figure is an explanatory diagram of the proof, and FIG. 4 is a perspective view of another example using the principle of the present invention. H... Parallelogram link, 1.2.3.4... Link,
2°... Pivot center, 5.6... Extension rod, 5', 6°.
- Cutting edge part, 7.8.9... Point addition part.

Claims (1)

[Claims] Extension rods 5 and 6 of the same length are extended and protruded from adjacent links 1 and 4 of a parallelogram link H in which four links 1, 2, 3, and 4 of the same length are pivotally connected. Point-finding addition parts 7, 8, and 9 that make it possible to mark the most extreme points a and b of the extension rods 5 and 6 and the pivot points c of the links 2 and 3 are attached to the most extreme parts of the extension rods. 5', 6' and the pivot center 2' of the links 2, 3.