CN201442454U

CN201442454U - Teaching ruler with magnetic needle

Info

Publication number: CN201442454U
Application number: CN2008201928915U
Authority: CN
Inventors: 洪山
Original assignee: 洪山
Priority date: 2008-11-26
Filing date: 2008-11-26
Publication date: 2010-04-28
Anticipated expiration: 2018-11-26

Abstract

The utility model relates to a teaching instrument for drawing straight lines and circles, in particular to a teaching ruler with a magnetic needle which particularly can realize the purpose of drawing straight lines with convenience and accuracy as well as drawing circles correctly on blackboards made of different materials, solves the inconvenient drawing and low drawing efficiency of the prior teaching drawing instrument, can draw conventional straight lines and circles with flexibility and accuracy. The teaching ruler has the structure that a ruler body (3) is provided with graduations and two end bore holes of a steel ruler with long circle-shaped grooves in the middle; a magnetic needle end (1) capable of centering and a rolling ball balancing end (4) capable of keeping the balance (4) are mounted in the two holes respectively; the retractable centering magnetic needle end (1) is mounted with a steel needle capable of being sprung and an O-shaped strong magnetic adsorption magnet with a center hole, so as to apply to drawing environments with different materials as iron or wood board; a chalk sleeve casing (2) capable of adapting or sliding is mounted in the long circle-shaped groove in the middle, and the sliding part is formed by a hollow threaded pipe and a lock nut matched therewith; a balancing support body consisting of a rolling ball and a riveting ball seat is mounted in the other end hole.

Description

Magnetic stitch teaching gauge rule

Affiliated technical field:

The utility model relates to a kind of conventional teaching educational aid with picture straight line and circle, only especially can realize not only can having made things convenient for the accurate Drawing straight line but also can having realized exactly purpose at the blackboard upper drawing circle of unlike material with this instrument.

Background technology:

At present, in everybody the common teaching drawing tools ruler, set square and compasses are arranged.Mostly general these drawing tools are independent body, and function singleness is carried inconvenience, also have some other shortcomings simultaneously, inaccurate, dumb as the ruler line, compasses are made bowlder centering instability, are drawn radius of circle inaccuracy etc., make troubles to teaching, influence the raising of efficiency of teaching.

The utility model content:

For the use inconvenience, the not high defective of mapping efficient that overcome existing educational aid, the utility model provides a kind of teaching magnetic stitch ruler, and this ruler not only is convenient for carrying, and can flexibly, accurately draw out conventional straight line and circular arc etc.

The technical scheme that its technical problem that solves the utility model adopts:

The utility model instrument has steel ruler two stomidiums of scale and oblong slots and center chute one and is separately installed with the magnetic stitch that can feel relieved, slidably or chalk sleeve, the roller ball of tightening; But the center of centering pin foot has draw point, the outer ring that can eject that the O type ferromagnetism absorption magnet of one band centre bore is arranged, and this magnet and telescopic stitch adopt and flexibly connect, and the center of this part overlapped with the zero point of rule blade; Slidably part is made up of the butterfly locking nut of band externally threaded cannulated threaded pipe of tubulose and cooperation with it; The cannulated threaded pipe has the effect of chalk sleeve concurrently, and its aperture adapts with the chalk of using always, and external diameter is slightly less than the oblong slots width in the middle of the blade; The roller ball that the other end is installed forms movable balanced support, guarantees the flexibility of its drawing.

The beneficial effects of the utility model are, can conveniently realize one-object-many-purposes, can draw straight line flexibly, can accurately draw circular arc or circle, and are simple in structure, use, easy to carry.

Description of drawings:

The utility model is described in further detail below in conjunction with drawings and Examples:

Fig. 1 is a whole rigging position schematic diagram of the present utility model

1. centering magnetic stitch ends, 2. slip chalk sleeves, 3. blades, 4. roller ball balance end among the figure

Fig. 2 is the view of blade 3

Blade 3 selection thickness are 3mm (being with two stomidiums and middle chute)

Fig. 3 is the structure longitudinal section of centering magnetic stitch end 1

5. centering pins, 6. nuts, 7. back-moving springs, 8. screw threads among the figure

9. chi body 10. threaded tubes 11. magnet

Fig. 4 is the profilograph of slip chalk sleeve 2

12. butterfly locking nuts, 13. screw shells among the figure

Fig. 5 is the cutaway view of roller ball balance end 4

14. riveted joint ball seats, 15. roller balls among the figure

The specific embodiment:

In Fig. 1, the magnetic of can feeling relieved stitch end 1 is installed in the left end hole of blade 3, and slip chalk sleeve 2 is installed in the middle chute of blade 3, and roller ball balance end 4 is installed in the blade 3 right-hand member holes.

In embodiment illustrated in fig. 2, blade 3 can select for use the steel ruler (thick 3mm) of end boring, middle groove milling or thicker aluminum strip to make; And make the center of circle of its zero graduation and centering end overlapping, guarantee that the radius of picture bowlder is accurately readable.

In the embodiment shown in fig. 3, centering pin 5 adopts similar ball pen head internal structure, realize the flexible of steel stitch by combinations such as nut 6 back-moving springs 7, screw threads 8, threaded tube 10 and chi body 9 are for movingly, threaded tube 10 bottoms embed O type magnet 11, can be implemented on the blackboard of unlike material with them and feel relieved.

In the embodiment shown in fig. 4, the cannulated threaded pipe jointing of butterfly locking nut 12 and screw shell 13 can be locked or be slided flexibly in the middle chute of chi body 9 and regulate the picture radius of circle, draws and can insert the cannulated threaded pipe with chalk.

In the embodiment shown in fig. 5, roller ball 15 is pressed in the riveted joint ball seat 14 of chi body stomidium, and can roll flexibly is unlikely to come off, and the balance of maintenance and centering magnetic stitch end 1 guarantees the flexibility of drawing.

Claims

1. a teaching is with magnetic stitch ruler, have one and to be separately installed with the magnetic stitch that can feel relieved, slidably or chalk sleeve, the roller ball of tightening in steel ruler two stomidiums of scale and oblong slots and the center chute, it is characterized in that: but centering pin foot center has draw point, the outer ring that can eject that the O type ferromagnetism absorption magnet of one band centre bore is arranged; Slidably part is made up of the butterfly locking nut of band externally threaded hollow bolt of tubulose and cooperation with it; The other end forms balanced support by roller ball.

2. teaching according to claim 1 magnetic stitch ruler is characterized in that: the ferromagnetism magnet of an end band centre bore adopts flexible connection with ejecting flexible stitch, and the center of this part overlapped with the zero point of blade scale; Slidably Bu Fen cannulated threaded pipe has the effect of chalk sleeve concurrently, and its aperture adapts with the chalk of using always, and its external diameter is slightly less than the oblong slots width in the middle of the rule; The roller ball that the other end is installed forms movable balanced support.