CN201808357U

CN201808357U - Compasses

Info

Publication number: CN201808357U
Application number: CN2010202664131U
Authority: CN
Inventors: 陈际军
Original assignee: Individual
Current assignee: Individual
Priority date: 2010-07-12
Filing date: 2010-07-12
Publication date: 2011-04-27
Anticipated expiration: 2020-07-12

Abstract

Compasses consist of a handle, a main rod, ruler arms, a rotating plate and a circle center pin. The rotating plate is in pin joint with the main rod and the circle center pin, the ruler arms are connected to the periphery of the rotating plate, and holes and scales are arranged on the upper planes of the ruler arms. When in use, a hole matching with the diameter of a circle to be drawn is selected, a pen point is inserted into the hole, and the circle can be drawn by pressing the handle. Damages of drawing paper and table plates due to the pin of the compasses can be avoided.

Description

A kind of compasses

Technical field

The utility model relates to a kind of drafting instrument, specifically a kind of compasses.

Background technology

Its stitch of common compasses will pierce through drawing, and nail is drawn round on desktop or chart board, like this, not only pierce through drawing, and on desktop or chart board, can stay pin hole, if high-grade desktop or glass platen, those such compasses have made with regard to bad, make troubles to drawing assignment.

Summary of the invention

For overcoming the existing technical deficiency of compasses, the invention provides a kind of compasses, these compasses not only exempt to establish stitch, and are provided with scale, can not leave pin hole, and mapping is convenient.

The utility model solves the technical measures that its technical problem takes, the mobile jib upper end of rhombus is provided with handle, the lower end connects the upper end of turntable shaft, the center of circle pin of the lower end fixed cylinder shape of turntable shaft, the lower end of center of circle pin is with anti-skidding perspex particle, rotating disk can pivot, connect A with movable elastomeric joint (prior art) by trisection around the rotating disk, B, three arm chis of C, the bellmouth that a row penetrates is opened on the plane on three the arm chi, bellmouth is vertically arranged, and the spacing in hole is calculated with millimeter, and A arm chi spacing is 1,4,7 rule is arranged in order, B arm chi is 2,5,8 rule is arranged in order, and C arm chi is 3,6,9 rule is arranged in order.Three arm chis can upwards be turned up parallel with mobile jib, easy to carry and store when standby.During use, the tip of the plastic cement particle of underfooting, center of circle end is aimed at required centre point of drawing a picture, select the arm chi of a required mapping diameter length, folding makes it follow mobile jib vertical parallel with drawing downwards, insert with nib in the bellmouth of selected chi, make the circumference paddling, the arm chi is along with dial rotation, and mobile jib and center of circle pin are positioned at and maintain static on the turntable shaft, because center of circle pin maintains static, and be the plastic cement particle, can not slide again, draw the purpose that bowlder can not pierce through drawing and damage desktop and platen thereby reach.

The beneficial effects of the utility model are, avoid drawing and desktop by compasses stitch acanthopore or damage, and indicate yardstick, and drawing is convenient, and is simple in structure.

Description of drawings

The utility model is described in further detail below in conjunction with accompanying drawing.

Accompanying drawing is a kind of structural representation of compasses.

Among the figure, 1, handle, 2, mobile jib, 3, A arm chi, 4, B arm chi, 5, C arm chi, 6, rotating disk, 7, center of circle pin, 8, bellmouth.

The specific embodiment

In the drawings, handle 1 is fixed on the upper end of Three Diamond mobile jib 2, the lower end of mobile jib connects the axle upper end of rotating disk 6, the lower end of turntable shaft is center of circle pin 7 fixedly, the lower end of center of circle pin is with anti-skidding perspex particle, rotating disk can pivot, connect A arm chi 3 with movable elastomeric joint by trisection around the rotating disk, B arm chi 4, C arm chi 5, the bellmouth 8 that a row penetrates is opened on the plane on the arm chi, bellmouth is vertically arranged, and the spacing in hole is calculated with millimeter, and the arrangement pitches in three arm chi holes interlaces, A arm chi is 1,4,7 rule is arranged in order, B arm chi is 2,5,8 rule is arranged in order, and C arm chi is 3,6,9 rule is arranged in order when standby the arm chi and can upwards turns up parallelly with mobile jib, is convenient to deposit and carry, usually the plastic cement particle is made taper, and tip down.

Claims

1. compasses, the mobile jib upper end of Mitsubishi's shape is provided with handle, it is characterized in that: the lower end of described mobile jib connects the upper end of turntable shaft, the center of circle pin of the lower end holding cylindrical of turntable shaft, the lower end of center of circle pin is with anti-skidding plastic cement particle, described rotating disk can pivot, and connects three arm chis by trisection around the described rotating disk, and row's bellmouth is opened on the last plane of described arm chi.

2. a kind of compasses according to claim 1, it is characterized in that: the bellmouth on described three arm chis is vertically arranged, the spacing in hole is calculated with millimeter, the spacing of A arm chi is that 1,4,7 rule is arranged in order, the spacing of B arm chi is that 2,5,8 rule is arranged in order, and the spacing of C arm chi is that 3,6,9 rule is arranged in order.

3. a kind of compasses according to claim 1 is characterized in that: described plastic cement particle is made taper with transparent plastic cement, and tip down.