CN2202336Y

CN2202336Y - Computing rule for engineering

Info

Publication number: CN2202336Y
Application number: CN 93214581
Authority: CN
Inventors: 崔仲侯
Original assignee: Individual
Current assignee: Individual
Priority date: 1993-05-28
Filing date: 1993-05-28
Publication date: 1995-06-28
Anticipated expiration: 2003-05-28

Abstract

The utility model relates to a computing ruler for engineering, a mathematical teaching aid in primary schools, comprising a ruler body, a rhombic frame string, a ringer bar, a pointer, a beginning end fixing pin, a head resisting bolt, a slide block, etc. When the head resisting bolt is pushed to move from left to right along the ringer bar, the rhombic frame string is compressed or stretched, the point rapidly, correctly and equally divides any line segment, so teachers are easy to visually demonstrate and teach engineering questions. The utility model can be used for mathematical extracurricular activities of pupils and as a plotting instrument of civil engineering.

Description

Computing rule for engineering

The utility model relates to a kind of calculation teaching aid of primary school mathematics engineering problem, the engineering problem Rule for performing mathematical calculations that particularly allows the teacher carry out ocular demonstration for the full student of class on blackboard.

The teaching of primary school's engineering problem, at present the general teaching methodology that adopts is on the basis of knowledge in the past, step by step near problem, should, this is to meet very much knowledge systematicness.Bad but if the student learnt in the past, there is the knowledge tomography, teaching is just relatively more difficult in this way.

The teacher has to spend the more time to help student's review knowledge in the past in order to overcome this difficult point.In order to explain example one, when preparing before the class, must a long line segment be divided into the different some five equilibriums of several length with a lot of time, to represent different work efficiencies.At this moment such problem can occur, if divide on the same line section, the student does not see at all, if divide on several line segments, student thought takes place chaotic again easily; On the other hand, division has been got well to take again and has also been lacked intuitive in the classroom.Still there is not a kind of teaching aid to help teachers and students from this predicament, to free at present.Many student's results of learning are very undesirable, just extremely remove when solving a problem and apply arbitrarily.In case some variation of topic type is just folded one's hands helplessly.

The purpose of this utility model is that a kind of device that allows the primary school mathematics teacher can carry out the engineering problem object teaching will be provided.Use the utility model to impart knowledge to students, only need the knowledge of utilization score division just passable.The student can be from observing the teacher the ocular demonstration of long a section little line segment of line segment intercepting, and the solution approach that oneself sums up engineering problem is come.

The purpose of this utility model is achieved like this: have in central authorities a rectangle vacancy the chi body above, frame a stock (hereinafter to be referred as collar bar), and be hinged the mutually diamond string that forms of diamond that is equated by some length of sides is suspended in the below of this collar bar.If change the shape of each diamond, just can make several diagonal line sums that are connected in needed several continuous diamond parallel and equal a certain line segment, so the Along ent of this line segment has just been pointed out in the position at the tie point place between each diamond.

This diamond string is made up of following part: the lengthy motion picture mid point that equates two length of sides is hinged with a thick pin (hereinafter to be referred as pivot pin), form " * " shape unit, with many such unit, be hinged mutually with little pin again, cut off initiating terminal and terminal half unnecessary sheet, but just obtained the diamond string of Free Transform under external force.The upper end of each pivot pin and vertical being connected of little cylinder, each little cylinder is connected with an annulus of top again, these annulus are enclosed within on the collar bar, and diamond is strung the annulus of top top, with the left end of a pin pin at collar bar, on the annulus above the diamond string end, be furnished with one and support a nut, so just formed agent structure of the present utility model.This collar bar is parallel to the long limit of chi body, the center of each little cylinder is inserted with a root pointer, pointer is also perpendicular to the long limit of chi body, when not using, this pointer is under the effect of roundlet tube inner spring, and syringe needle is not exposed on the outside, and there is a nut cap spiral cover rear end of little cylinder thereon, a vertical masonry joint is arranged on the nut cap, can allow the vertical little bar of pointer tail end pass through.From left to right be composed of " 0 ", " 1 ", " 2 ", " 3 " on every piece of pointer head of Pai Lieing ... number, if " 0 " number pointer is aimed at the top of (or be parallel to the long limit of chi body) arbitrary line segment of drawing along the long limit of chi body, make arbitrary piece of pointer aim at the end of this line segment, then this line segment is just by each piece pointer of the present utility model institute five equilibrium between 2 of its whole story.Because the character that the utility model has utilized the diagonal line of congruent rhombus correspondence to equate, so any line segment of five equilibrium rapidly and accurately.Therefore, be well suited for the teacher carries out engineering problem on blackboard ocular demonstration teaching, Smart Student uses it to separate engineering problem can avoid written calculation, so can use for the extracurricular mathematics interests group work of pupil.Again since its five equilibrium line segment easily and accurately also can be used as the civil engineering work plotting machine and use.

The concrete structure of utility model is provided by following embodiment and accompanying drawing.

Accompanying drawing 1 is vertical view and the A-A cut-open view when throwing off partial cover plate according to the engineering problem Rule for performing mathematical calculations that the utility model proposes.

Accompanying drawing 2 is the utility model situations when pulling out three pieces of pointers for trisection line segment AB face.

Accompanying drawing 3 is the utility model during with line segment AB trisection, the synoptic diagram of position when each piece hand motion stops.

Below in conjunction with details and the working condition of accompanying drawing detailed description according to the concrete device that the utility model proposes.

This device comprises that there is the chi body (1) of a rectangle vacancy in central authorities and with some pivot pins (2), little pin (3) hinge equal in length lengthy motion picture and the diamond string (4) that obtains, this diamond string (4) by with the annulus (7) of vertical little cylinder (6) that links to each other in pivot pin (2) upper end and roundlet tube top thereof, be suspended in the central rectangle vacancy of chi body (1) below the collar bar (12).The annulus (7) of diamond string (4) initiating terminal top is by the left end of holding fixing pin (11) pin in collar bar (12), and the annulus (7) of terminal top is furnished with one and supports a nut (8).Spring (15) is arranged in the little cylinder (6), and there is a nut cap with a vertical masonry joint (14) rear end, and central authorities are inserted with pointer (5), and this pointer (5) afterbody has a vertical with it little bar (13).Face shield lastblock cover plate (10) on this structure also has a slide block (9), and the length scale is arranged on the long limit of chi body (1).

When the teacher will intercept 1/X on line segment AB, just must be when for example intercepting 1/3AB earlier with the AB trisection, in this routine accompanying drawing 2, can pull out and be numbered " 2 ", " 4 ", " 6 " three pieces of pointers, aim at the A point of line segment AB with " 0 " number pointer, promote to support a nut (8) then and move right, up to making pointer " 6 " aim at the B point of AB, this moment, the A point was 1/3AB to the distance between " 2 " number pointer.

When X is decimal, in the time of for example will intercepting 1/2.5AB, can be like this: because 1/2.5=2/5, so as long as earlier with AB five five equilibriums, intercepting 2 five equilibriums wherein get final product again.

Claims

1, engineering problem calculation teaching aid, the engineering problem Rule for performing mathematical calculations that particularly allows the teacher on blackboard, carry out ocular demonstration for the full student of class, this device is had the chi body (1) of a rectangle vacancy by central authorities, be suspended on the diamond string (4) in the central rectangle vacancy of chi body (1), support the some little cylinder (6) of diamond string (4) and some annulus (7) of top thereof, support a nut (8), the top fixing pin (11) of diamond string (4), collar bar (12) is formed agent structure, be inserted with pointer (5) in the little cylinder (6), one slide block (9) is arranged on the long limit of chi body (1), it is characterized in that diamond string (4) is formed with the pin hinge by some congruent diamonds.

2, engineering problem Rule for performing mathematical calculations according to claim 1 is characterized in that on the edge of chi body (1) the length scale being arranged.