CN2134295Y

CN2134295Y - Axle-centre type compasses

Info

Publication number: CN2134295Y
Application number: CN 92214354
Authority: CN
Inventors: 梁仁; 梁京
Original assignee: Individual
Current assignee: Individual
Priority date: 1992-03-31
Filing date: 1992-03-31
Publication date: 1993-05-26
Anticipated expiration: 2002-03-31

Abstract

The utility model provides drawing compasses which draw rounds and arc lines. The utility model is characterized in that a shaft is perpendicular to the shaft of a picture, the lower end of the shaft is a disk type round center foot, the upper end of the shaft is a shaft sleeve type compasses body, a handle is arranged on a shaft sleeve, and a scribed line arm is connected with the shaft sleeve. When the utility model draws a picture, the scribed line arm and the shaft sleeve are rotated round the shaft center, and for adapting the field angle change of the scribed line arm, the length (height) of the shaft or the length of the scribed line arm is adjustable. The utility model has the advantages of simple operation, high stability, novel structure, safe use and carrying and can favorably draw the picture on the surface of a high hardness body (such as on a blackboard).

Description

Axle-centre type compasses

The utility model is the compasses that are used for draw circles and camber line.

The present compasses that use, the motion in drawing is the rotation by handle, the revolution of handle, compasses body inclination angle forward, the common decision in the oblique angle that center of circle pin and picture constitute is the motion of a complexity.Past has carried out some to it and has improved, as center of circle pin can be in harmonious proportion be provided with the device of stable line arm subtended angle.But operating difficulties, the problem of poor stability is not resolved, and especially when line arm subtended angle is big or some special occasions (mapping on the blackboard), above problem just comes out more significantly.In addition,, hang down age user's appearance in a large number, produced the unsafe factor of center of circle pin again owing to the reform of primary school textbook.

The purpose of this utility model is: a kind of simple to operate, good stability is provided, still can normally maps on the hard objects surface, and to low age user use, safe to carry, the new construction compasses of outward appearance novelty.

Realization of the present utility model is according to being: perpendicular to the circle core shaft of picture, the lower end of axle is a core formula center of circle foot, and the upper end of axle is axle sleeve type compasses bodies, and handle is located on the axle sleeve type compasses body, and the line arm is connected with axle sleeve type compasses body.In the mapping.Line arm and axle sleeve type compasses body together rotate around the axle center.For adapting to the variation of line arm subtended angle, be provided with the adjustable length of axle or the adjustable length structure of line arm.

The utility model adopts following 3 points that have that the disc type center of circle need be illustrated enough:

1, for adapting to the needs of mapping diameter, answer one on attached center of circle pin standby less than the center of fiqure foot.Low age user then there is not this necessity.

2, for conveniently measuring radius, center of circle foot diameter should be integer.As 10 millimeters or 20 millimeters.And on the foot of the center of circle, indicate.

3, be carved with orthogonal coordinate straight line on the foot of the center of circle, its intersection point is the center of circle, also is the axle center of circle core shaft simultaneously, and identical vertical boost line is made in the center of circle of assigned position, and two coincide can map.Home position regularly, does not then have this necessity.

Below in conjunction with drawings and Examples the utility model is further specified.

Fig. 1 is the motion schematic diagram in the compasses construction that uses at present.

Fig. 2 is the utility model schematic diagram.

Fig. 3 is the rule vertical profile structural map of arm lengths adjustable structure of first embodiment.

Fig. 4 is the vertical profile structural map of the second embodiment circle core shaft adjustable length structure.

Fig. 5 is that the 3rd embodiment rules that arm lengths is adjustable, the vertical profile structural map of spinning structure.

Fig. 6 is the schematic diagram that disc type center of circle foot is checked and approved the center of circle.

Among the figure: 1, the rotation of handle; 2, the revolution of handle; 3, compasses body inclination angle forward; 4, the oblique angle of center of circle pin and picture formation; 5, circle core shaft; 6, disc type center of circle foot; 7, axle sleeve type compasses body; 8, handle; 9, line arm; 10, lock nut; 11, steel ball; 12, Spring Card; 13, spiral handle; 14, spring; 15, spring shim; 16, pin; 17, sleeve pipe.

In first embodiment shown in Figure 3, disc type center of circle foot 6 is assemblied in the lower end of circle core shaft 5, axle sleeve type compasses body 7 is inserted in the upper end of circle core shaft 5, circle core shaft 5 is provided with a Spring Card 12 and prevents that circle core shaft 5 from skidding off in axle sleeve type compasses body 7, the frictional force a when steel ball 11 is housed between the top of circle core shaft 5 and the axle sleeve type compasses body 7 in order to the minimizing rotation.Be in this embodiment with the line arm 9 adjustable length guarantee that nib and picture remain on same plane.After the lock nut 10 that loosens line arm 9 when adjusting radius during use mixed up the arm lengths of ruling, lock nut can be mapped.

In second embodiment shown in Figure 4, be to guarantee that with the adjustable length of circle core shaft nib and picture remain on same plane.In this embodiment, disc type center of circle foot 6 is assemblied in a sleeve pipe 17 lower ends, and circle core shaft 5 inserts sleeve pipe 17 and can slide up and down therein, adjusts back locking lock nut 10.In this embodiment, line arm arm 9 is identical with existing compasses, can directly utilize.

In the 3rd embodiment shown in Figure 5, be adjustable with the line arm lengths, adopt the spinning structure simultaneously.Its spinning structure is by spiral handle 13, spring 14, and pin 16, spring shim 15 and axle sleeve type compasses body constitute.During use,, act on the pin 16 by the slope of thread on the spiral handle 13 and to change into revolving force, make it rotation mapping automatically to the power that presses down spiral handle 13.Screw thread on the spiral handle 13 paints full circle for more than 1.5 weeks of rotation when depressing handle with assurance.Spring 14 will be sold and have the dynamics can not be too soft.Spring shim 15 is the round iron sheet, and the center is pressed with a pinnacle, in order to reduce friction.Other of this embodiment is partly identical with first embodiment.

Claims

1, a kind of compasses, handle are located on the compasses body, and the line arm links to each other with the compasses body, and adjusting line arm subtended angle, turning handle are made figure, it is characterized in that: perpendicular to the circle core shaft of picture, the lower end of axle is a disc type center of circle foot, and the upper end of axle is axle sleeve type compasses bodies.

2, compasses according to claim 1 is characterized in that: the spinning structure that is made of spiral handle, spring, pin, spring shim and axle sleeve type compasses body.