CN2246820Y

CN2246820Y - Permanent-magnet teaching abacus

Info

Publication number: CN2246820Y
Application number: CN 95211951
Authority: CN
Inventors: 沙永成
Original assignee: Individual
Current assignee: Individual
Priority date: 1995-05-18
Filing date: 1995-05-18
Publication date: 1997-02-05
Anticipated expiration: 2005-05-18

Abstract

The utility model relates to a teaching abacus which is characterized in that a magnet (5) is arranged at the edge of an abacus bead hole (7) which is arranged in the center of an abacus bead (3), and a crosspiece rod (4) is made of iron tubes. The attraction force between the magnet (5) and the crosspiece rod (4) can make the toggled abacus bead (3) stop at any position of the crosspiece rod (4). The utility model has the advantages of convenient operation, simple fabrication, long service life, and proper cost; the magnet (5) is difficult to demagnetize, and compared with the existing 'conventional abacus', the service life is longer about 20-30 times. Even the magnetic force of the magnet (5) is reduced owing to demagnetization when the utility model can not be used normally, the magnet (5) can be magnetized to restore magnetic property to be used continuously.

Description

The permanent magnetism teaching-aid abacus

The utility model relates to a kind of teaching-aid abacus, especially is furnished with the permanent magnetism teaching-aid abacus of magnet in bead.

At present, the abacus that teaching is used claims " hair abacus ", it is to be clipped in the middle of 2 iron wires the hair of pig is horizontal, iron wire is roped, make hair form spiral fashion hair rod, put bead with this mao rod as the shelves rod on the abacus, utilize the elasticity of hair rod, in order to the fixing position of bead, but new in use " hair abacus " is owing to the elasticity of pig hair is bigger when stirring bead up and down, require great effort very much when stirring bead up and down, use inconvenience, and use after a while, because bead rubs on hair, it is thinning to make that hair constantly comes off, the power of stirring bead is also more and more littler, when hair rare to a certain degree the time hair flexible fastening not bead, bead slides automatically, this " hair abacus " only lost its use value because of coming off of hair like this, and general every " hair abacus " can only use about 800 hours.

The purpose of this utility model provides a kind of easy to use, long-lived teaching-aid abacus.

In order to achieve the above object, permanent magnetism teaching-aid abacus of the present utility model by: framework, crossbeam, bead, lever are formed, bead is injection molded with polyethylene material, medial surface in the bead hole is equipped with magnet, lever is to be made by the iron pipe material, diameter is slightly less than the internal diameter in bead hole, can freely stir bead on lever.

After having adopted such structure, owing in inboard, bead hole magnet is arranged, lever is made with iron pipe, and the attractive force between magnet and the lever can make the bead of stirring rest on any position on the lever.It is firmly all more even when new and old permanent magnetism teaching-aid abacus uses, easy to use, magnet also is difficult for demagnetization, delayed the serviceable life of teaching-aid abacus greatly, the life-span of every permanent magnetism teaching-aid abacus use is " hair abacus " about 20-30 a times, and cost is suitable, even magnet makes the bottom of bead landing at lever because of demagnetization, make and also can magnetize when the permanent magnetism teaching-aid abacus can not continue to use, make it can continue to use magnet.

Below in conjunction with the drawings and specific embodiments the utility model is described in further detail.

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

Fig. 2 is the cut-open view of bead A-A among Fig. 1,

Fig. 3 is the B-B portion view of Fig. 2.

As shown in Figure 1, framework 1 of the present utility model, crossbeam 2 its specifications, material requirements conform to the national Specification of " hair abacus ".Be built-in with lever 4 at framework 1, lever 4 is to make of iron pipe, the about 7mm of its external diameter, and the distance between each lever 4 conforms to the requirement of " hair abacus ".

As Fig. 2, shown in Figure 3, used bead 3 its physical dimension of the utility model are measure-alike with " hair abacus " bead, bead 3 is injection molded with polyethylene material, be shaped on bead hole 7 at the center of bead 3 during injection moulding, its diameter is 8mm, and is equipped with magnet 5 at the edge in bead hole 7, it is of a size of 14 * 8 * 3mm, the magnetic of each magnet 5 equates, for economical with materials and the weight that reduces bead 3, is shaped on some honeycomb apertures 6 in a side of bead 3.When bead 3 string is on lever 4, magnet 5, the attractive force between the lever 4 can make bead 3 stir as required and rest on any position of lever 4.

Claims

1, a kind of permanent magnetism teaching-aid abacus is made up of framework (1), crossbeam (2), bead (3), lever (4) etc., and it is characterized in that: lever (4) is that iron pipe is made, and is equipped with magnet (5) at the edge in the bead hole (7) at bead (3) center.

2, permanent magnetism teaching-aid abacus according to claim 1 is characterized in that: bead (3) is injection molded with polythene material, and is shaped on some honeycomb apertures (7) in a side.