CN2374881Y

CN2374881Y - Add-and-subtract primary and secondary ruler

Info

Publication number: CN2374881Y
Application number: CN 98244737
Authority: CN
Inventors: 蒋和
Original assignee: Individual
Current assignee: Individual
Priority date: 1998-10-07
Filing date: 1998-10-07
Publication date: 2000-04-19
Anticipated expiration: 2008-10-07

Abstract

The utility model relates to an add-and-subtract primary and secondary ruler, relating to a learning tool for children. The utility model is composed of a base ruler which is called primary ruler (1) with a scale unit and number, a slide ruler which is called a secondary ruler (2) and an accessory vernier (3). The base ruler and the slide ruler are plugged and overlapped; the secondary ruler slide in the primary ruler left and right; the addition calculation or the subtract calculation can be carried out as long as two sets of scale numbers on the two rulers are corresponding. The utility model can also be served as a common straight ruler to make the measurement of length and draw straight lines. The utility model is especially suitable for the fresh children. The utility model can cause the student to improve the visual comprehension on the addition calculation or the subtract calculation to enhance the computation speed.

Description

Plus-minus primary and secondary chi

The utility model plus-minus primary and secondary chi is the compound apparatus that a kind of children learn simple plus-minus method and linear measure longimetry, belongs to children's stationery class.

The principle of the utility model plus-minus primary and secondary chi, be similar to traditional slipstick, but traditional slipstick only lays particular emphasis on some complicated function calculation, and does not have the length measurement function of most basic plus and minus calculation and common ruler, and along with popularizing of counter eliminated by market.The children that begin to learn signed magnitude arithmetic(al) spontaneously do plus-minus by single ruler or two rulers stacks sometimes and calculate many inconveniences are arranged.

The purpose of this utility model is can make simple addition and subtraction for preprimary child and primary grades pupil provide a kind of, carries out the compound chi of length metering again.For children understand the key concept of plus and minus calculation, improving arithmetic speed provides simple and direct, directly perceived, effective schooling apparatus.

The purpose of this utility model is to realize like this, addition is the most basic computing of children's learning mathematics, addition definition comparatively strict in the arithmetic theory is: first number goes out several a in natural sequence, then number goes out the b number again, count to last, must have the number c in the natural sequence corresponding with it, this c just be called a and b with.The computing of summation is called addition.Scale numeral on common ruler has just in time constituted the expansion natural sequence of band " 0 ".Two rulers that have identical scale unit numeral are overlapped, and property direction along the line is parallel to each other, slides and just can give expression to the operational definition of above-mentioned addition.Number goes out several a on female chi, the sub-chi that slides then, and severals a that the scale starting point 0 of sub-chi is aimed on female chi, then number goes out b on sub-chi, and the point corresponding with b is exactly to count c on female chi.Subtraction is the inverse operation of addition, therefore also can calculate subtraction on chi.In order to make eye-catching, the outstanding counting of being convenient to of chi high scale numeral, numeral on female chi is marked in the diamond, the scale mark that both sides link to each other plays the measurements and calculations function respectively, the numeral on the sub-chi be marked on make it in the triangle frame with female chi on the digital block divide obviously, be convenient to contrast and calculate.Digital " 0 " is not a natural number, it on the chi face starting point of measuring, the effect that in counting is made the process of plus and minus calculation, has the contraposition indication again, in order to distinguish mutually just without rhombus and triangle picture frame with other numeral, and adopt other indicative symbol or sub-chi is made into the end points chi, promptly the left side of ruler directly is exactly " 0 " some scale mark.For simple and direct and enlarge counting region, the one group of corresponding mutually scale in ruler top to be centimetre be unit and mark numeral, following one group mutually the scale of correspondence be unit with the millimeter and mark whole ten numeral.The connected mode of two chis can adopt various ways such as grafting and socket.Vernier has been an indicative function, and the connected mode of factor chi and female chi is different to be provided with in different ways, also can omit vernier.

The utility model has the advantages that, plus and minus calculation on the linear measure longimetry number of division of ruler and the number axis is integrated in one effectively, simple in structure, be easy to make, easy to use, intuitive is strong, be particularly suitable for begining to learn the notion that children understand plus and minus calculation, improve computing velocity, and number and amount are united effectively.

The utility model is described in further detail below in conjunction with accompanying drawing:

Fig. 1 is the stretch-out view of making by hand of plus-minus primary and secondary chi.

Fig. 2 is the manual setting synoptic diagram of plus-minus primary and secondary chi.

Fig. 3 is the structural representation that plus-minus primary and secondary chi is made of hard material.

1, is female chi, 2, be sub-chi; 3, be vernier.

The simplest embodiment of the utility model is the stretch-out view that prints out plus-minus primary and secondary chi on harder paper, as shown in Figure 1, then by children through cut, sticking self manufacture, earlier the slot on female chi among the figure is cut, be connected into the cover envelope of a belt length cylindrical void then in stickup, the last more rectangular sub-chi insertion cover of cutting the envelope gets final product.Vernier can be made one by oneself with adhesive tape, and two-layer glue in the face of sticking red line of therebetween, is made a ring, ring is flattened to be enclosed within on female chi just can horizontally slip.Also Zhan Bingtu can be designed to the form of triangular prism, as shown in Figure 2.Though it is simple that papery plus-minus primary and secondary chi is made, the shortcoming of low-quality rapid wear is arranged.If adopt hard materials such as plastics, organic glass, metal.Connected mode on the primary and secondary chi can adopt shown in Figure 3 inserting by mode, and a dovetail groove is set on female chi, and the left end of groove is established one grade of bar, and we opens right-hand member and be used to insert sub-chi.It is trapezoidal that sub-chi is that end points chi section can be, and a slide is set as vernier on it.The length of student's chi is drawn with the Chinese in 20 centimetres of accompanying drawings of being advisable and is illustrated about 10 centimetres.As then can be further, improve contrast and visual perception effect with colour printing.

Claims

The compound chi that a kind of pupil with plus-minus computing function uses, it also claims female chi (1) by basic chi, slide rule also claims sub-chi (2) and vernier (3) to constitute, base is characterised in that female chi and sub-chi all have long measure scale and numerical value, it is side by side parallel to be plugged on two groups of scales that make together on two chis, slide mutually by push-and-pull, two groups of mutual corresponding formations of scale numerical value can be made the plus-minus primary and secondary chi of plus and minus calculation, sub-chi respectively has two groups of different scales of unit with female chi, the unit of the one group of scale in top is centimetre, the unit of following one group of scale be millimeter, " 0 " number of division sign in addition is in triangle or diamond, can be printed as stretch-out view with soft material, be used for children and make practical manual stationery, female chi forms the cover envelope of an end opening in a tape hole through bonding back, sub-chi is packed into and wherein slided, and on female chi of broad slot is set with the primary and secondary chi of hard material making, be used for inserting sub-chi, vernier can be arranged on female chi or on the sub-chi.