CN2403587Y - Educational compasses - Google Patents

Abstract

The utility model relates to a circular curve plotter, which comprises a magnetic pad and a pair of compasses with two feet. The magnetic pad is composed of an outer sleeve and a magnet which is embedded on the outer sleeve, and the center of the magnetic pad is provided with a positioning hole of the centre of a circle. The lower parts of rotating feet of the compasses are provided with a clamp, a clamping piece is arranged on the inner side of a clamping sleeve, and a regulating knob screw passes through the lower part of the clamping sleeve and is pushed and contacted with the clamping piece. A rotating device is composed of shaft pieces, a rotating shaft and a knob. The shaft pieces are staggered and clamped. Grinding strips and scales can also be provided. The utility model is convenient for positioning the centre of the circle and has the advantages of no slide, reasonable clamp design, elastic contact of the clamping piece and a chalk, large contact surface, large clamping friction of the rotating device, convenient regulation, little quality, low cost, firm and durable structure. The chalk is hard to break, and a chalk head can also be repaired.

Description

Educational compasses

The utility model relates to a kind of circular curve plotter.

Educational compasses is a kind of circular curve drawing instrument that is usually used in imparting knowledge to students.There is following problem in the educational compasses that uses at present: 1) when " magnet board " upper drawing circle, the draw point that was fixed in the center of circle originally often skids, and the mobile picture circle that causes in the center of circle is failed.If help to buttress the center of circle with left hand, very inconvenient, and on the blackboard of being everlasting, mark a lot of scar.2) fixedly the anchor clamps of chalk use inconveniently, and chalk is not only hard but also crisp, be not to press from both sides too tightly, and be exactly too pine of folder, folder too tightly makes chalk disconnected broken again easily.3) little when big during the moment of friction of rotating part, be difficult for regulating, too radius can change during pine, draws bowlder and becomes the picture helical.If when firmly screwing screw, damage thread sometimes.The CN2186166Y patent provides a kind of educational compasses, and it sets up a sucker centring means on the basis of existing bipod compasses, determine the center of circle by sucker.A kind of sucked type compasses of CN2161479Y patent disclosure, it is made up of the sucker and the universal joint of principal arm, auxiliary, shaft coupling, chalk fixing device and location, is specially adapted to Glass blackboard.The CN2138042Y patent provides a kind of teaching aid compasses center of circle locator, and it is pressed with the centering cone borehole jack in the sucker upper end, and the chalk that an end is whittled into taper inserts in the sucker cylinder blind hole.The CN2224098Y patent provides a kind of magnetic center of circle locator, it is fastened with a pilot pin at the middle part of transparent block one side, be fastened with 3～5 permanent magnets around the pilot pin, another side is fastened with a locating piece of putting into the concentric draw point that also can allow compasses one pin top of pilot pin.

The real novel purpose of this usefulness aims to provide a kind of center of circle of finding accurately easily, and the center of circle is difficult for sliding, and chalk is not easily broken broken, improved educational compasses easy to adjust.

The utility model is provided with magnetic pad, bipod compasses.The magnetic pad is made up of overcoat and magnet, and magnet is embedded in outer putting, and center of circle locating hole is established at the center of magnetic pad.The chalk anchor clamps are established in the bottom of the rotation pin of bipod compasses, and the chalk anchor clamps comprise chuck, intermediate plate and adjusting knob screw, and chuck is located at the bottom of rotating pin, and intermediate plate is arranged at the inboard of chuck, and the adjusting knob screw passes the bottom of chuck and contacts on intermediate plate.Preferably establish soft pad in the side that intermediate plate contacts with chalk, intermediate plate adopts spring leaf, and soft pad is bonded on the intermediate plate.The fixing feet of bipod compasses is made up of axle sheet, rotating shaft and the knob of two compass foots upper end with the tumbler that rotates pin, and the center of a sheet is passed in rotating shaft, is regulated fixing by knob.Fixing feet adopts staggered clamping mode with the axle sheet that rotates pin, and the axle sheet of two compass foots preferably is respectively 3 and 2.Can be provided with the mill line at the lateral surface of chuck in addition, be convenient to repair the chalk head, for example wear into taper or wedge, to satisfy the demand of drawn line style width.Rotate pin and can adopt pipe, can deposit many chalks simultaneously so that rotate in the pin.

The utility model is convenient to the accurate location in the center of circle, is difficult for sliding, and the magnetic pad can be inhaled the rotating shaft knob place at compasses, is difficult for losing; The jig Design of chalk is reasonable, intermediate plate and chalk Elastic Contact, and contact-making surface is big, and pressure is little, and chalk is not easily broken broken, and spring clip resets easily, regulates easy; Rotate in the pin pipe and can deposit many chalks, easy to use; The multiaxis sheet is staggered to be clamped owing to adopt, and the frictional force of whole tumbler is increased, and fastening very convenient with adjusting; Owing on chuck, set up the mill line, be convenient to repair at any time the chalk head; The utility model also can be used for pressing from both sides ballpoint pen, pencil, pen etc.Quality is little, and cost is low, and is light and handy, firm, durable.

Fig. 1 is a structural representation of the present utility model.

Fig. 2 is a magnetic pad schematic diagram.

Fig. 3 is chalk anchor clamps schematic diagrames.

Fig. 4 is the tumbler schematic diagram.

By Fig. 1～3 as seen, educational compasses is made up of magnetic pad 1 and bipod compasses 2, and magnetic pad 1 is established irony overcoat 11 and magnet 12, and magnet 12 is embedded in the hole, the back side 111 of overcoat 11, establishes the taper shrinkage pool as center of circle locating hole 112 in the front center of overcoat 11.Bipod compasses 2 are provided with and rotate pin 21, fixing feet 22, chalk anchor clamps 23 and tumbler 24.Chalk anchor clamps 23 are fixed on the bottom of rotating pin 21, chalk anchor clamps 23 are made up of chuck 231, spring clip 232, rubber sheet gasket 233 and adjusting knob screw 234, chuck 231 is fixed in the bottom of rotating pin 21, spring clip 232 is arranged at the inboard of chuck 231, rubber sheet gasket 233 is bonded in the inboard of spring clip 232, and the bottom that adjusting knob screw 234 passes chuck 231 contacts the outside at spring clip 232.Referring to Fig. 4, tumbler 24 is made up of 2 bobbin sheets 242 of 3 bobbin sheets 241 that rotate pin 21 upper ends and fixing feet 22 upper ends and rotating shaft 243 and knob 244, axle sheet 241 and 242 clamping that interlocks, and the center of a sheet is passed in rotating shaft 243.

Referring to Fig. 1, establish mill line 2311 in the side of chuck 231, so that finishing chalk head.Rotate pin 21 and fixing feet in addition and select the stainless steel square tube of stainless pipe or 12.7mm (length) * 12.7mm (the wide) * 0.7mm (thick) of  12.7mm * 0.8mm for use, not only quality is little, and cost is low, and is sturdy and durable, one hand just can be drawn circle, and can deposit many chalks.Also can establish scale on two compass foots.

Claims (8)

1. educational compasses comprises the bipod compasses, it is characterized in that being provided with the magnetic pad, and the magnetic pad is made up of overcoat and magnet, and magnet is embedded in outer putting, and center of circle locating hole is established at the center of magnetic pad; The rotation underfooting portion of bipod compasses establishes the chalk anchor clamps, and the chalk anchor clamps comprise chuck, intermediate plate and adjusting knob screw, and chuck is located at and is rotated underfooting portion, and intermediate plate is arranged at the chuck inboard, and the adjusting knob screw passes the chuck bottom and contacts on intermediate plate; The tumbler of the fixing feet of bipod compasses and rotation pin is made up of axle sheet, rotating shaft and the knob of two compass foots upper end, and rotating shaft is passed the center of a sheet and fixed by the knob adjusting, and the axle sheet on two compass foots adopts the clamping mode that interlocks.

2. educational compasses as claimed in claim 1 is characterized in that said magnet is embedded in the hole, the back side of overcoat, and the center of circle locating hole of tapered shrinkage pool is located at the overcoat front center.

3. educational compasses as claimed in claim 1 is characterized in that said intermediate plate is a spring clip, is provided with soft pad in the spring clip inboard.

4. educational compasses as claimed in claim 3 is characterized in that said soft pad adopts sheet rubber.

5. educational compasses as claimed in claim 1 is characterized in that the axle sheet of said two compass foots is respectively 3 and 2.

6. educational compasses as claimed in claim 1 is characterized in that being provided with the mill line at the lateral surface of chuck.

7. educational compasses as claimed in claim 1 is characterized in that said rotation pin adopts pipe or square tube.

8. educational compasses as claimed in claim 1 is characterized in that two compass foots are provided with scale.

Images