CN2046080U - Trigonometric function and optimum seeking point proportional dividers - Google Patents

Abstract

The utility model discloses a trigonometric function and optimum seeking point proportional divider, which is composed of the hinging of two divider pens. Each divider pen is provided with four locating holes with the definite proportion; the required length of the preparation line segment is determined. The utility model can conveniently and exactly obtain the line segment whose length is duplication and inverse duplication with the known line segment, the known line is subdivided at the preferred Point 0.618, and an effective and practical tool is provided for making the developed pattern.

Description

Trigonometric function and optimum seeking point proportional dividers

The utility model relates to a kind of instrument that segments line segment.

In plumber's blanking and designing and mapping, often run into the drafting of simple and easy expanded view, need produce and the proportional line segment of special trigonometric function value.And traditional method not only needs to use instruments such as ruler, scriber (or painting pen), divider, also must calculate and produce with ad hoc approach, is unfavorable for increasing work efficiency.In real work, also often run into the operation of known line segment being selected excellent intercepting.

The purpose of this utility model is, design a kind of trigonometric function scale, can obtain to become the line segment of special trigonometric function value multiple easily and from the line segment of preferred point segmentation, for producing of simple and easy expanded view in the actual job provides a kind of effectively instrument of practicality with it with known line segment.

Design philosophy of the present utility model is, utilize the proportional geometrical principle of two similar triangle corresponding sides, two hinged backs of rule pen are constituted two similar triangles, set the distance one-tenth special ratios of pin joint to a same rule two ends, then two lines of the nib formation of two rule pens are also corresponding proportional, thereby realize purpose of design of the present utility model.Below in conjunction with drawings and Examples the utility model is explained.

Fig. 1 is a practical structures of the present utility model.As known in the figure, it comprises two rule pens (1) and (2) that structure is identical, and the two ends of every rule pen are pointed scriber.Be equipped with four locating holes (3) on described every rule pen.The position of each locating hole (3) on the rule handwriting is (referring to Fig. 2); Described four locating holes (3) separately to rule pens one end apart from a and this locating hole (3) to the ratio (being a:b) of the distance b of advising an other end be respectively 0.382:0.618,1:2, $\sqrt{2}$ ：2、 $\sqrt{3}$ ：2。First ratio hole is determined according to mathematical optimization method 0.618 value herein.Locate to be hinged at the locating hole (3) of same position and just constituted trigonometric function scale described in the utility model in described two rule pen (1) (2).Jointed shaft can adopt the structure of bolt shown in Figure 3 (4) and nut (5), can adjust the position of pin joint so as required easily.Countersunk seat as shown in Figure 4 can also be set, in order to bolt head and the nut (5) that holds bolt (4) at the locating hole place of two rule pen (1) (2) respectively.In order when changing pin joint, to make things convenient for mobile bolt (4), also can on the rule handwriting, offer the elongated slot (6) of each locating hole of connection.

Trigonometric function scale described in the utility model can accurately and easily obtain to become 1/2 with known line segment

$\frac{\sqrt{2}}{2}、\frac{\sqrt{3}}{2}$

Line segment doubly or its times line segment reciprocal and segment known line segment in preferred point are for the making of expanded view provides a kind of simple effectively practical tool.

For example, get a:b= $\sqrt{3}$ : the locating hole at 2 places is hinged and will two short arms be flared to two nibs distance and be known line segment length with two rule pens, and then the nib of long two arms is apart from being known line segment

$\frac{\sqrt{3}}{2}$

Double-length.

The utility model is simple in structure, easy to use, and it both can be used for the segmentation of line segment, and the expansion that can be used for line segment again is long.

Description of drawings:

Fig. 1 is a structure of the present utility model, and Fig. 2 is a single rule structure, and Fig. 3 is a jointed shaft, and Fig. 4 is a kind of reference configuration by A-A shown in Figure 1 position, and Fig. 5 is the rule structure when having elongated slot (6), wherein:

1,2---rule pen 3---hinge hole

4---bolt 5---nut

6---elongated slot

Claims (3)

1, a kind of trigonometric function and preferred point scale, it comprises two rule pens (1) and (2) that structure is identical, feature of the present utility model is, the two ends of described each rule pen are pointed scriber, rule have four locating holes (3) on the handwriting, described four locating holes (3) separately to rule pen one end apart from a and this locating hole to the ratio of advising an other end distance b (be a: b) be respectively 0.382: 0.618,1: 2, $\sqrt{2}$ ∶2、 $\sqrt{3}$ : 2, two rule pens (1) are located to be hinged at the locating hole (3) of same position with (2).

According to claim 1 described trigonometric function and preferred point scale, it is characterized in that 2, the jointed shaft of described two rule pen (1) (2) is the bolt (4) of band nut (5).

According to claim 1 described trigonometric function and preferred point scale, it is characterized in that 3, described rule handwriting is provided with the elongated slot (6) that is communicated with each locating hole (3).

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