CN201922774U - Improved compasses - Google Patents

Abstract

The utility model relates to school things, in particular to improved compasses, which comprise a base, a rotary rod and a pencil. The improved compasses are characterized in that a disk with graduations is fixed onto the base, a center shaft is mounted in the middle of the disk, a press handle is arranged at the upper end of the center shaft, the rotary rod with graduations is movably connected to the center of the center shaft, the pencil capable of reciprocating is mounted on the rotary rod, and a catch button is disposed at the tail end of the rotary rod. Accordingly, the improved compasses have the advantages that the improved compasses are simple in structure, are convenient, practical and speedy, can be used for accurately drawing circles with different radiuses or circular arcs with different radians according to learning needs, and saves troubles.

Description

A kind of improvement compasses

(1) technical field

The utility model relates to a kind of study article, particularly a kind of improvement compasses.

(2) background technology

Compasses all are indispensable study articles on mathematics class or geometry class, but existing compasses function is all more single, decide the bowlder of radius when needing divider calipers, must could draw circle with the length that ruler measures regulation, can not draw the as required circular arc of regulation radian, these are all made troubles to learning life.

(3) summary of the invention

The utility model provides a kind of improvement compasses that can accurately draw circle or circular arc in order to remedy the deficiencies in the prior art.

The utility model is achieved by the following technical solution:

A kind of improvement compasses, comprise base, bull stick and pencil, its special character is: the disk that is fixed with a band scale on the described base, the disk middle part is equipped with a central shaft, the central shaft upper end is provided with a handle, the central shaft middle part is connected with the bull stick of a band scale, and the pencil of activity back and forth is installed on the bull stick, and the bull stick end is provided with a catch button.

Described pencil is provided with a buckle, and pencil fixes by buckle and bull stick.

Described base lower end is provided with a locking pin.

Therefore, the beneficial effects of the utility model are: these improvement compasses, and simple in structure, convenient and practical, can fast save trouble again according to study needs accurately the draw circle of different radii or the circular arc of different radians.

(4) description of drawings

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

Fig. 1 looks schematic diagram for master of the present utility model;

Fig. 2 is a schematic top plan view of the present utility model.

Among the figure, 1 base, 2 disks, 3 central shafts, 4 handles, 5 bull sticks, 6 pencils, 7 buckles, 8 catch buttons, 9 locking pins.

(5) specific embodiment

Accompanying drawing is a kind of specific embodiment of the present utility model.This embodiment comprises base 1, bull stick 5 and pencil 6, be fixed with the disk 2 of a band scale on the base 1, disk 2 middle parts are equipped with a central shaft 3, central shaft 3 upper ends are provided with a handle 4, and central shaft 3 middle parts are connected with the bull stick 5 of a band scale, and the pencil 6 of activity back and forth is installed on the bull stick 5, bull stick 5 ends are provided with a catch button 8, pencil 6 is provided with a buckle 7, and pencil 6 fixes by buckle 7 and bull stick 5, and base 1 lower end is provided with a locking pin 9.

Adopt improvement compasses of the present utility model, locking pin 9 is fixed on the paper that to draw, according to the radius of concrete needs, pencil 6 is moved to bull stick 5 corresponding scale value places, the buckle 7 that closes is fixing with pencil 6, and left hand is pinned handle 4, and the right hand rotates bull stick 5 and draws round getting final product; When drawing the circular arc of certain radian if desired, rotate bull stick 5 according to the scale of disk 2 and get final product to suitable radian.Therefore, the beneficial effects of the utility model are: these improvement compasses, and simple in structure, convenient and practical, can fast save trouble again according to study needs accurately the draw circle of different radii or the circular arc of different radians.

Claims (3)

1. improve compasses for one kind, comprise base (1), bull stick (5) and pencil (6), it is characterized in that: the disk (2) that is fixed with a band scale on the described base (1), disk (2) middle part is equipped with a central shaft (3), central shaft (3) upper end is provided with a handle (4), central shaft (3) middle part is connected with the bull stick (5) of a band scale, and the pencil (6) of activity back and forth is installed on the bull stick (5), and bull stick (5) end is provided with a catch button (8).

2. improvement compasses according to claim 1 is characterized in that: described pencil (6) is provided with a buckle (7), and pencil (6) fixes by buckle (7) and bull stick (5).

3. improvement compasses according to claim 1 is characterized in that: described base (1) lower end is provided with a locking pin (9).

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