CN2224095Y

CN2224095Y - Attracted-disk type multi-function compasses for teaching of mathematics

Info

Publication number: CN2224095Y
Application number: CN 95211950
Authority: CN
Inventors: 孙利
Original assignee: Individual
Current assignee: Individual
Priority date: 1995-05-18
Filing date: 1995-05-18
Publication date: 1996-04-10
Anticipated expiration: 2005-05-18

Abstract

The utility model relates to a compasses for teaching, which overcomes the abuses of the existing compasses whose fixed foot is a steel needle. The steel needle is difficult to fix on a blackboard. A foot provided with a chalk is a fixed installation. The length of the chalk is not easy to regulate. The major technique is characterized in that an endpoint of a right leg (4) of the utility model is provided with a cardan joint (6) which is connected with a suction cup (8) through a cardan joint sleeve (7). So the right leg (4) can be swung all around on the suction cup (8) optionally when the suction cup (8) of the right leg of the utility model is fixed to the blackboard. The endpoint of a left leg (2) of the utility model is provided with a gib head (11). The gib head is matched with a regulating device which can fix the chalk (9) and make the length of the chalk (9) expand and contract.

Description

The sucked type multifunctional teaching compasses

The utility model relates to a kind of educational compasses, and especially a kind of compasses fixing feet is the multifunctional teaching compasses of sucked type.

In mathematical education, teacher often will use educational aids such as compasses, ruler, protractor, because educational aid is many, teacher carries inconvenience, and the trouble that seems again.A kind of utility model patent multifunctional teaching compasses, the patent No. is: 92237657.3, it is that compasses, ruler, protractor function are integrated, teacher carries and seems more convenient, but the employing of the fixing feet of this kind compasses is the draw point formula, and the used blackboard great majority of current school are the cement blackboard, so compasses of draw point formula fixing feet, often be difficult on the cement blackboard, carrying out location, the center of circle,, blackboard also had damage even locate reluctantly; What the chalk fixing device of another pin of compasses adopted simultaneously is fixed, and use inconvenience is regulated as required to the length of chalk, thereby the not too handled easily that also seems.

The purpose of this utility model is to provide a kind of fixing feet of compasses to fix easily on blackboard, do not damage blackboard, the another pin of compasses is the chalk device fixedly, can regulate the length of chalk according to actual needs at any time, with compasses ruler, protractor function multifunctional teaching compasses that be integrated, easy to use.

The technical scheme that the utility model solves is: the sucked type multifunctional teaching compasses that compasses right leg, the left leg that is used by the double as ruler and the right sheet of protractor with protractor function, protractor left side sheet etc. are formed, be characterized in: the end points at the right leg of compasses is furnished with universal joint, and link to each other with sucker by joint boot, make compasses right crus of diaphragm sucker on blackboard fixedly the time, right leg can be on sucker arbitrarily around swing; On the bolt head that the left leg end points of compasses is shaped on, being furnished with fixedly, chalk also can make the chalk adjusting device of flexible length according to actual needs.

Owing to adopt said structure, advantage of the present utility model is: compasses sucked type fixing feet is easy to fix on blackboard, and can not damage blackboard, the another pin of compasses is the chalk device fixedly, can screw out the lifting cover according to actual length needs during use, the time spent can not make not frangibility of chalk to seem that use is more convenient with in the chalk precession lifting cover.

Below in conjunction with accompanying drawing the utility model is described in further detail:

Fig. 1 is an overall construction drawing of the present utility model;

Fig. 2 is the sectional structure chart of sucked type fixing feet of the present utility model;

Fig. 3 is the fixedly sectional structure chart of chalk lowering or hoisting gear of left foot of the present utility model.

As shown in Figure 1, the sucked type multifunctional teaching compasses is made up of left leg 2, right leg 4, is being shaped on scale by national ruler standard on the left leg 2 He on the right leg 4, their upper ends connect with circle plug 3, a left side leg 2 and right leg 4 can rotate around circle plug 3, and be stretching on a line time when two legs, then can work as the ruler use.On the protractor left side sheet 5 that is equipped with respectively on the left leg 2 of compasses, right leg 4 tops, the right sheet 1 of protractor, by circle plug 3 centre bores is that the center of circle is shaped on reticule respectively,

left side leg

2 and 4 open angles of right leg can be read angle on this protractor, make it to use as protractor.On the bolt head 11 of the lower end of right leg 2, be furnished with fixing chalk 9 and can make the adjusting device of chalk 9 flexible length.Be equipped with universal joint 6 in the lower end of right leg 4, and link to each other with sucker 8 by joint boot 7, make compasses right crus of diaphragm sucker 8 on blackboard fixedly the time, right leg 4 can be on sucker 8 be swung around arbitrarily.

Shown in Figure 2ly be equipped with metal lining 19 in right leg 2 lower ends, lining 19 endoporus are screwed hole, universal joint 6 one ends are bolt, the other end is made a bulb 20, the slightly larger in diameter of bulb 20 is in the external diameter of other end bolt, joint boot 7 endoporus one end is made the stepped hole less than endoporus, its step surface is an arc surface, and the bolt of universal joint 6 one ends is passed through, and make its other end bulb 20 can not be by matching with its step surface, the other end of joint boot 7 is a screwed hole, in joint boot 7 holes, below being furnished with universal joint 6 other end bulbs 20, be equipped with spring 21, screw 22 is by the centre bore of sucker 8, packing ring 23 fits over the lower surface of joint boot with it, the top of screw 22 is holddown spring 21 simultaneously, makes the bulb 20 on the universal joint 6 identical with the endoporus upper end arc surface of joint boot 7.Sucker 8 shapes resemble the plate shape, and are made for transparent plastics, are can see the round center of circle clearly in order to draw bowlder.

Shown in Figure 3, on the bolt head 11 that compasses left side leg 2 end points are shaped on, is furnished with fairlead 12, fairlead 12 endoporus bottom, is furnished with cover for seat 13, cover for seat 13 inner hole walls are provided with double wedge 16 and are used to install chalk 9 (double wedge 16 is used to prevent that chalk 9 from skidding), fairlead 12 walls are provided with symmetry " Z " shape gathering sill (15), fairlead 12 peripheries are furnished with the lifting cover 18 that bore area is provided with helicla flute 17, the middle and lower part of cover for seat 13 peripheries is arranged with protruding nail 14, the gathering sill 15 that protruding nail 14 passes on the fairlead 12 is assigned in the helicla flute 17 of lifting cover 18, rotate lifting and overlapped 18 o'clock, chalk 9 is stretched out or retraction in fairlead 12.

The above-mentioned most preferred embodiment that can make the adjusting device of chalk 9 flexible length, basic identical with the structure of the lowering or hoisting gear of Ms's cosmetics lipstick of market sale, the centre bore that different is on fairlead 12 tops is shaped on screw, makes it to match with the bolt head 11 of compasses left side leg 2 end points.

Claims

1, a kind of sucked type multifunctional teaching compasses, form by compasses right leg (4), left leg (2) and the right sheet (1) of protractor with protractor function, protractor left side sheet (5) etc. that the double as ruler uses, it is characterized in that: the end points at the right legs of compasses (4) is furnished with universal joint (6), and link to each other with sucker (8) by joint boot (7), make compasses right crus of diaphragm sucker (8) on blackboard fixedly the time, right leg (4) can swing around sucker (8) is gone up arbitrarily; On the bolt head (11) that left leg (2) end points of compasses is shaped on, be furnished with fixing chalk (9) and can make the adjusting device of the flexible length of chalk (9).

2, a kind of sucked type multifunctional teaching compasses according to claim 1, it is characterized in that: be furnished with lining (19) in right leg (4) end points, is furnished with universal joint (6) in the screwed hole of lining (19), universal joint (6) one ends are bolt, the other end is made bulb (20), the slightly larger in diameter of bulb (20) is in the external diameter of other end bolt, joint boot (7) endoporus one end is made the stepped hole less than endoporus, its step surface is an arc surface, and the bolt of universal joint (6) one ends can not be passed through by making its other end bulb (20), match with its step surface, the other end of joint boot (7) is a screwed hole, in joint boot (7) hole, below being furnished with universal joint (6) other end bulb (20), be equipped with spring (21), screw (22) is by the centre bore of sucker (8), packing ring (23) fits over the lower surface of joint boot (7) with it, and the top of screw (22) is holddown spring (21) simultaneously, makes the bulb (20) on the universal joint (6) identical with the endoporus upper end arc surface of joint boot (7).

3, a kind of sucked type multifunctional teaching compasses according to claim 1, it is characterized in that: on the bolt head (11) that compasses left side leg (2) end points is shaped on, be furnished with fairlead (12), fairlead (12) endoporus bottom, be furnished with in the cover for seat (13) of interior pore area double wedge (16) chalk (9) is housed, fairlead (12) wall is provided with symmetry " Z " shape gathering sill (15), fairlead (12) periphery is furnished with the lifting cover (18) that bore area is provided with helicla flute (17), the middle and lower part symmetry of cover for seat (13) periphery does not have protruding nail (14), the gathering sill (15) that protruding nail (14) passes on the fairlead (12) is assigned in the helicla flute (17) of lifting cover (18), when rotating lifting cover (18), can in fairlead (12), stretch out or the length of retraction is regulated chalk (9).