CN202144164U

CN202144164U - Straight ruler capable of measuring diameter

Info

Publication number: CN202144164U
Application number: CN201120254730U
Authority: CN
Inventors: 金波; 倪昀; 贾红红
Original assignee: Jinhua Polytechnic
Current assignee: Jinhua Polytechnic
Priority date: 2011-07-11
Filing date: 2011-07-11
Publication date: 2012-02-15
Anticipated expiration: 2021-07-11

Abstract

The utility model relates to drawing apparatuses or teaching aids of stationery, in particular to a straight ruler capable of measuring diameter, which mainly comprises a main ruler, a secondary ruler and a sliding block, wherein a longitudinal slot is arranged in the middle of the main ruler, the bottom surface of the middle of the longitudinal slot is provided with a steering round hole, the sliding block and the middle of the secondary ruler are connected into a whole, the sliding block can slide along the longitudinal slot, and the sliding block can steer at the position of the steering round hole. The straight ruler capable of measuring the diameter is reasonable in design, is easy to realize, not only can draw straight lines and vertical lines, but also can measure the diameter, and is simple in structure and convenient for use.

Description

Can measure the ruler of diameter

Technical field

The utility model relates to the drawing instrument or the teaching aid of stationery, particularly a kind ofly can draw straight line, vertical line, the ruler of the diameter measured that energy measurement diameter, and simple structure again is practical.

Background technology

As everyone knows, stationery purposes in the market is more single, and particularly the student need be through the method for the mapping diameter line that draws earlier when measuring diameter of a circle with ruler or set square, and with ruler tolerance, efficient is low again.The ruler that can measure diameter can address this problem.

Summary of the invention

In order to address the above problem, the utility model provides a kind of ruler of measuring diameter, can draw straight line, and the energy measurement diameter is to design according to the mathematical knowledge of diameter of a circle on the perpendicular bisector of string again, also to the teacher a kind of effective teaching aid is provided.

The scheme that the utility model adopted is:

The ruler that can measure diameter mainly is made up of main scale, secondary chi and slide block; The centre of said main scale has cannelure; The bottom surface at the middle part of said cannelure has and turns to circular hole; The middle part of said slide block and said secondary chi connects as one, and said slide block can slide along said cannelure, and said slide block can turn at the said circular hole place that turns to.

The beneficial effect of the utility model is:

Can measure the ruler realization reasonable in design and easy of diameter, can draw straight line, vertical line, the energy measurement diameter is simple in structure again, and is easy to use.

Description of drawings

Figure below in conjunction with the utility model further specifies:

Fig. 1 is the top schematic appearance of said main scale;

Fig. 2 is the A-A profile of Fig. 1;

Fig. 3 is the bottom surface schematic appearance of said main scale;

Fig. 4 is the sketch map of the middle part of said slide block and said secondary chi when connecting as one;

Fig. 5 is the sketch map of the said ruler of measuring diameter when measuring diameter of a circle to be measured;

Fig. 6 is the sketch map of the said ruler of measuring diameter during as ruler.

Among the figure, 1. cannelure 2. turns to circular hole, 3. secondary chi, 4. slide block, circle 5. to be measured.

The specific embodiment

Like Fig. 1 is the top schematic appearance of said main scale, is the A-A profile of Fig. 1 like Fig. 2, is the bottom surface schematic appearance of said main scale like Fig. 3, and the centre of said main scale has cannelure (1), and the bottom surface at the middle part of said cannelure has and turns to circular hole (2).

Sketch map when to be said slide block (4) with the middle part of said secondary chi (3) connect as one like Fig. 4, said slide block (4) can slide along said cannelure (1), and said slide block (4) can be located to turn at the said circular hole (2) that turns to.

Like Fig. 5 is the sketch map of the said ruler of measuring diameter when measuring diameter of a circle to be measured, and the said ruler of measuring diameter mainly is made up of main scale, secondary chi and slide block.Through the moving sets chi, directly read the numerical value of diameter from main scale.During operation point of origin on the main scale and circle being gone up any overlaps; Again the moving sets chi make said secondary chi about two summits overlap simultaneously with circle; Two summit lines are exactly one section string of this circle about said; This moment, the longitudinal centre line of said main scale was exactly the perpendicular bisector of this string, and diameter of a circle just on the perpendicular bisector of string, therefore is easy to obtain this circular diameter from main scale.

Like Fig. 6 is the sketch map of the said ruler of measuring diameter during as ruler, when said slide block (4) said when turning to circular hole (2) to locate to revolve to turn 90 degrees, said main scale overlaps with said secondary chi, uses as ruler; When said main scale is vertical with said secondary chi, can makes square and use.According to the difference of the scope of application, the scale of main scale can have different specifications, and the length of secondary chi also can have different length.

Claims

1. the ruler that can measure diameter; Mainly constitute by main scale, secondary chi and slide block; It is characterized in that: the centre of said main scale has cannelure (1), and the bottom surface at the middle part of said cannelure has and turns to circular hole (2), and said slide block (4) connects as one with the middle part of said secondary chi (3); Said slide block (4) can slide along said cannelure (1), and said slide block (4) can be located to turn at the said circular hole (2) that turns to.