CN2451348Y

CN2451348Y - Educational compass with handle

Info

Publication number: CN2451348Y
Application number: CN 00263869
Authority: CN
Inventors: 练仰贤; 陈妤
Original assignee: XIAMEN FOREIGN LANGUAGE SCHOOL
Current assignee: XIAMEN FOREIGN LANGUAGE SCHOOL
Priority date: 2000-11-27
Filing date: 2000-11-27
Publication date: 2001-10-03
Anticipated expiration: 2010-11-27

Abstract

The utility model discloses a pair of teaching compasses with a handle, which relates to a teaching appliance. A handle is arranged on a connecting part of the top ends of a fixing rod and a moving rod of the existing compasses, and a positioning sleeve of a rotating shaft is extended and arranged on the lower end of the handle and fixed on the rotating shaft of the connecting part of the fixing rod and the moving rod. The top of the handle is best in a circular arc shape. A new fulcrum and rotating torque can be obtained. The utility model has the advantages of more convenient use, easy control, easy direction regulation and easy assembly and disassembly of the handle.

Description

The educational compasses of band handle

The utility model relates to a kind of teaching aid.

Educational compasses is widely used in middle and primary schools' teaching, generally is provided with to decide bar, moving bar and rotating shaft, decides bar and sets pin, and moving bar is established the chalk folder.The CN2310343Y patent provides a kind of absorption type teaching demonstration compasses, and it is the commentaries on classics leg in the bottom of deciding bar of existing teaching demonstration compasses is provided with outer fixed that turning cylinder top, shaft coupling knot, turning cylinder bottom and sucker constitute, and replaces existing pin type leg with it.The known teaching compasses are not with handle, are difficult for 360 ° of rotations during its shortcoming upper drawing circle.

The purpose of this utility model is to provide a kind of educational compasses with handle.

The utility model is established one handle at the top connection part of deciding bar and moving bar of known teaching compasses, and the lower end of handle extends the rotating shaft positioning sleeve, and is fixed in and decides bar and rotating shaft place of moving bar connection part.

The said handle preferably top of handle is circular arc, so that make arc sections withstand the centre of the palm when using, so not only makes compasses obtain a new fulcrum, and makes compasses obtain rotating torque, therefore use more convenient, and easier control.In addition, because fixed, moving bar connection part rotating shaft place of compasses is fixed in the lower end of handle, its direction can be regulated as required, and its length, size also can design as required.If rotating shaft positioning sleeve two side through hole of handle extend otch, then the connecting mode of handle and rotating shaft place adopts plug-in type, when not needing handle, can extract out from rotating shaft easily.

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

Fig. 2 is the side view of Fig. 1.

Fig. 3 goes into the educational compasses structural representation that formula is decided needle protection and handle for bracelet.

Fig. 4 looks schematic diagram for the left side of Fig. 3.

Fig. 5 is a cassette detachable handle structural representation.

Fig. 6 is the pivot structure schematic diagram with monolateral draw-in groove.

Fig. 7 is the pivot structure schematic diagram with bilateral draw-in groove.

Fig. 8 is the pivot structure schematic diagram with full checkpost groove.

Fig. 9 pushes the telescopic educational compasses structural representation of deciding needle protection and handle for band.

Figure 10 is the upward view of Fig. 9.

Figure 11 is the telescopic structural representation of deciding the educational compasses of needle protection and handle of band latch.

Embodiment 1: as Fig. 1, shown in 2, the utility model comprises decides bar 1, moving bar 2, rotating shaft 3 and handle 4.The top of handle 4 extends spheroid 41, and the rotating shaft union end of handle 4 extends rotating shaft fixed cover 42, and rotating shaft fixed cover 42 is all established the rotating shaft through hole with the

plate

11,21 of deciding bar 1, moving bar 2, so that these through holes are passed in rotating shaft 3.One end of rotating shaft 3 can be established fixed knob 31, and the other end of rotating shaft 3 is established rotating shaft hold-doun nut 5.If dismounting lower handle 4 then becomes the educational compasses of not being with handle.

Embodiment 2: referring to Fig. 3～5; for bracelet is gone into the educational compasses that formula is decided needle protection and handle; it is formed by deciding bar 1, moving bar 2, rotating shaft 3, handle 4 etc.; decide the bottom band of bar 1 and decide pin 12; chalk-holder 22 is established in the bottom of moving bar 2; 23, so that pack chalk into, establish buckling piece 6 in the lower inside of moving bar 2.When using up compasses, decide bar 1, moving bar 2 closes up, buckling piece 6 can will be decided pin 12 location and fasten.Buckling piece 6 can be made as crooked shape, for example " L " shape, the fastening piece of " C " shape or " J " shape or fastening hook.For the ease of the loading and unloading handle, can extend otch 43 at rotating shaft two side through hole of arm pivot post fixed cover 42, the width of otch 43 is slightly larger than the diameter of rotating shaft 13.For rotating shaft hold-doun nut 5 can not being rotated together when the rotational fixation knob, can in rotating shaft 3, establish draw-in groove 44.Draw-in groove 44 can be established monolateral (see figure 6), bilateral (see figure 7) or full limit (see figure 8).

Embodiment 3: referring to Fig. 9; 10; for band is pushed the telescopic educational compasses of deciding needle protection and handle; decide the bottom band of bar 1 and decide pin 13; decide the top sleeve of pin 13 and regulate the button 7 of usefulness, deciding to offer groove 14 on the bar 1, sheathed spring 8 on button 7; spring 8 is located at and is decided in the bar 1, and button 7 can promote up and down at groove 14.When using compasses, press the button 7 and down promote to decide pin 13, then decide pin 13 and be pushed out and decide outside the bar; Press the button 7 after the use again and also up promote to decide pin 13, then decide pin 13 withdrawals and decide in the bar 1.The rotating shaft of handle can be adopted monolateral draw-in groove (see figure 6).

Embodiment 4: referring to Figure 11, be the telescopic educational compasses of deciding needle protection and handle of band latch.Decide the bottom band of bar 1 and decide pin 13, decide the last termination spring 15 of pin 13, the other end of spring 15 is fixing with alignment pin 16, decide to connect on the pin 13 latch 17, deciding to establish hole slot 18 with respect to the position of latch 17 on the bar 1, an end of latch 17 stretches out outside the hole slot 18, so that latch 17 is flexible in hole slot 18.In order to strengthen the rub-moment of deciding bar, moving bar and handle connection place, can be in two outsides of arm pivot post fixed cover or inboard and decide to establish pad between masthead portion connection place.

Claims

1, a kind of educational compasses is provided with and decides bar, moving bar and rotating shaft and connection part thereof, decide bar and is provided with and decides pin, it is characterized in that establishing one handle at the top connection part of decide bar, move bar, and the lower end of handle extends the rotating shaft positioning sleeve and is fixed in decides bar, moves rotating shaft place of bar connection part.

2, educational compasses as claimed in claim 1 is characterized in that the top of handle is circular arc.

3, educational compasses as claimed in claim 1 is characterized in that rotating shaft two side through hole of arm pivot post positioning sleeve extend otch.

4, educational compasses as claimed in claim 1, it is characterized in that in rotating shaft, establishing monolateral, bilateral or full checkpost groove.

5, educational compasses as claimed in claim 1 is characterized in that establishing buckling piece in moving bar lower inside.

6, educational compasses as claimed in claim 5 is characterized in that said buckling piece is " L ", " C " or " J " shape fastening piece or fastening hook.

7, educational compasses as claimed in claim 1 is characterized in that deciding establishing groove on the bar, decides bar and sets pin, decides the button that the pin upper sleeve can promote on groove, sheathed spring on button, and spring is located at and is decided in the bar.

8, educational compasses as claimed in claim 1 is characterized in that deciding the last termination spring of deciding pin in the bar, and the other end of spring is fixed with alignment pin, decides to connect on the pin latch, establishes hole slot with respect to the latch position deciding bar, and an end of latch stretches out outside the hole slot.