CN201169163Y

CN201169163Y - Novel self-suction type compasses

Info

Publication number: CN201169163Y
Application number: CNU2008201012985U
Authority: CN
Inventors: 孙丽娟
Original assignee: Individual
Current assignee: Individual
Priority date: 2008-01-30
Filing date: 2008-01-30
Publication date: 2008-12-24
Anticipated expiration: 2018-01-30

Abstract

The utility model discloses a novel pair of self-absorbing compasses which comprises a central loop bar, a rotating bar and a pen cap, wherein, the upper end of the central loop bar and the upper end of the rotating bar are positioned by a bolt and are in rotational connection around the bolt, and the pen cap is arranged at the lower end of the rotating bar. The structure of the novel pair of self-absorbing compasses is characterized in that the lower end of the central loop bar is provided with a central bar, and the lower end of the central bar is in rotational connection with a sucking disc. The tail end does not slide due to the stability of the maintenance of the sucking disc, the upper part of the sucking disc has a rotational structure which ensures that the rotating bar of the compasses rotates flexibly, and meanwhile, the transverse alignment is firm and accurate. The novel pair of self-absorbing compasses has the advantages that the structure is simple, a standard circle can be drawn on the hard and sleek blackboard smoothly, the center of a circle can be found accurately, the teaching becomes convenient, etc.

Description

A kind of self-priming formula compasses

Affiliated technical field:

The utility model relates to a kind of compasses, especially relates to a kind of self-priming formula compasses.

Background technology:

It is very difficult when the compasses that China's classroom instruction is at present generally used are drawn on blackboard, generally doing the support point in the center of circle makes with iron nail, bowlder iron nail support is incessantly fixing on hard smooth blackboard or Glass blackboard drawing with the iron nail compasses, the compasses core is sliding easily, make the picture circle both inaccurate, inconvenient again, the problem of the very difficult picture circle of teacher occurs, and be difficult for finding the center of circle behind the circle that draws.

Summary of the invention:

The purpose of this utility model is in order to overcome the deficiency that prior art exists, designed a kind of simple in structure, a kind of self-priming formula compasses that can be successfully on hard smooth blackboard, draw standard round and can accurately find the center of circle, bring convenience to teaching.

The purpose of this utility model is achieved in that described self-priming formula compasses, comprise center loop bar, dwang and the pen cap, loop bar upper end, center and dwang upper end are rotationally connected by the bolt location and around bolt, the pen cap is located at the dwang lower end, its design feature is for to be provided with center-pole in loop bar lower end, center, and center-pole lower end and sucker are rotationally connected.

The purpose of this utility model can also be achieved through the following technical solutions, described self-priming formula compasses, and its characteristics are that described center loop bar is provided with the clip slot that dwang can change over to and deposit in.Described a kind of self-priming formula compasses, its characteristics are that the dwang lower end is connected with the pen cap by adjustable bolt, are provided with chuck in the pen cap, the adjusting bolt one end that the pen cap shell of the pen cap is provided with outward passes pen cap shell and is connected with chuck in the pen cap.

Advantage of the present utility model: the utility model is because it is particularly suitable for teaching and the use of drawing.The stability that adopts sucker to safeguard makes its terminal unlikely slip, and sucker top is rotational structure, and the dwang of compasses is rotated flexibly, and it is firm to feel relieved simultaneously, accurately.The best mode of this programme is to be material with timber, plastics, utilizes the basic equipment of machined factory, takes to produce in batches, for the demand of educational circles, realizes the practicality and the economic worth of sucker compass.

Description of drawings:

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

Among the figure: center loop bar 1, dwang 2, the pen cap 3, bolt 4, sucker 5, adjustable bolt 6, chuck 7 is regulated bolt 8, clip slot 9, center-pole 10.

The specific embodiment:

Below in conjunction with drawings and Examples structure of the present utility model and operation principle are elaborated:

As shown in Figure 1, self-priming formula compasses described in the utility model, it comprises center loop bar 1, dwang 2 and the pen cap 3, center loop bar 1 upper end and dwang 2 upper ends are rotationally connected by bolt 4 location and around bolt, the pen cap 3 is located at the dwang lower end and is used for fixing free ink pen or chalk etc., its design feature is for to be provided with center-pole 10 in center loop bar 1 lower end, and center-pole 10 lower ends and sucker 5 are rotationally connected.Sucker generally adopts elastomeric material to make the pushing sucker, can form vacuum in its spill cover and constitute the suction suction on hard smooth blackboard, dwang 2 lower ends are connected with the pen cap 3 by adjustable bolt 6, be provided with chuck 7 in the pen cap 3, the adjusting bolt 8 one ends that the pen cap shell of the pen cap 3 is provided with outward pass pen cap shell and are connected with chuck 7 in the pen cap 3, regulate chucks 7 with free ink pen or chalk degree of tightness in the fixing pen cap by regulating bolt 8, described center loop bar 1 is provided with the clip slot 9 that dwang 2 can change over to and deposit in, and time spent dwang and center loop bar are not close to and deposit in clip slot and be convenient to deposit when compasses.During use, sucker is fixed in blackboard, can aligns the center by the sucker centre bore, the center-pole 10 that the diameter of compasses is provided with by center loop bar 1 lower end rotates and drives center bars 1 and dwang and rotate and adjust diameter.Compasses of the present utility model are simple in structure, are easy to processing, during operation, only need a hand to finish, and therefore operation is very easy, and can aim at pre-centering exactly.

Claims

1, a kind of self-priming formula compasses, comprise center loop bar (1), dwang (2) and the pen cap (3), center loop bar (1) upper end and dwang (2) upper end are rotationally connected by bolt (4) location and around bolt, the pen cap (3) is located at the dwang lower end, it is characterized in that being provided with center-pole (10) in center loop bar (1) lower end, center-pole (10) lower end and sucker (5) are rotationally connected.

2, a kind of self-priming formula compasses according to claim 1 is characterized in that described center loop bar (1) is provided with the clip slot (9) that dwang (2) can change over to and deposit in.

3, a kind of self-priming formula compasses according to claim 1 and 2, it is characterized in that dwang (2) lower end is connected with the pen cap (3) by adjustable bolt (6), be provided with chuck (7) in the pen cap (3), adjusting bolt (8) the one end that the pen cap shell of the pen cap (3) is provided with outward passes pen cap shell and is connected with chuck (7) in the pen cap (3).