CN201703123U

CN201703123U - Compass with ruler

Info

Publication number: CN201703123U
Application number: CN2010202394382U
Authority: CN
Inventors: 者宸旭; 者渝芸; 者中林; 韩萍
Original assignee: 者宸旭
Priority date: 2010-06-18
Filing date: 2010-06-18
Publication date: 2011-01-12
Anticipated expiration: 2020-06-18

Abstract

The utility model provides a compass with a ruler, which can be directly regulated to a required radius value when two legs are opened. The compass with the ruler consists of a ruler box, foot arms, an outer leg, an inner leg, a ruler strip, a splint, an adjusting screw, a handle and a spring plate. Two parallelograms which are of a hinge structure are respectively formed by the foot arms, the outer leg, the inner leg and the spring plate of the compass and are symmetrical on both sides of the splint. When the two legs are opened, the root part of the inner leg is provided with incomplete gears with the same pitch circle, which are meshed mutually, so as to guarantee that the parallelograms on both sides are always symmetrical with the center line of the handle on the top of the splint and the insides of the foot arms are always parallel mutually. One end of the ruler strip is fixed on one foot arm, while the other end thereof is curled and fixed in the ruler box of the other foot arm and is connected with a coiled spring, and thus, the ruler strip is simultaneously pulled out when the compass legs are opened and the ruler strip is pulled into the ruler box by the coiled spring when the compass legs are closed, wherein the maximum scale of the exposed ruler strip is the radius of a circle to be drawn. The compass with the ruler has the advantages of convenient use and accurate drawing.

Description

The compasses of mark

Technical field

The utility model relates to a kind of compasses, particularly relates to a kind of compasses of mark.

Background technology

Use common compasses to draw accurate bowlder and two points of compasses need be aimed at corresponding size to determine accurate radius value on ruler, the very inconvenience that operates like this is not if there is ruler just more to bother on hand.

Summary of the invention

In order to overcome above-mentioned shortcoming, the utility model provides a kind of compasses that can directly be transferred to the mark on the required radius value when opening compasses two legs.

The utility model is to be made of chi box, pin arm, outer leg, interior leg, chi bar, clamping plate, adjustment screw, handle and latch plate, it is characterized in that: the pin arm of compasses, outer leg, interior leg, latch plate constitute the parallelogram of two hinge arrangements respectively; Interior leg root has intermeshing with the pitch circle partial gear; One end of chi bar is fixed on the pin arm, and the other end is curled in the chi box that is fixed on another pin arm and with wind spring and links to each other.

The technical scheme that its technical problem that solves the utility model adopts is: the parallelogram that the pin arm of compasses, outer leg, interior leg, latch plate constitute two hinge arrangements respectively is symmetrical in the both sides of clamping plate; Intermeshing parallelogram with pitch circle partial gear assurance both sides is symmetrical all the time with the handle center's line that is installed on the clamping plate top, pin arm inboard remains parallel because of interior leg root has when opening two legs; Because of an end of chi bar is fixed on the pin arm, the other end is curled in the chi box that is fixed in another pin arm and with wind spring and links to each other, so the chi bar is drawn out simultaneously when opening compass leg, the chi bar was drawn in the chi box by wind spring when compass leg closed up, and the maximum scale of the chi bar that exposes is the radius of a circle that will draw.

The invention has the beneficial effects as follows, easy to use, draw accurately.

Description of drawings

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

Fig. 1 is the structural representations of the utility model two legs when opening.

Fig. 2 is the schematic diagrames of the utility model two legs when closing up.

1 chi box among the figure, 2,10 pin arms, 3 outer legs, 4 interior legs, 5 chi bars, 6 clamping plate, 7 adjustment screw, 8 handles, 9 latch plates.

The specific embodiment

The mode that interconnects of each parts such as chi box 1, pin arm 2 (10), outer leg 3, interior leg 4, chi bar 5, clamping plate 6, adjustment screw 7, handle 8 and latch plate and position concern in the utility model as can be seen from Figure 1.

Below in conjunction with accompanying drawing operation principle of the present utility model is described.

As can be seen from Figure 2, when the leg of compasses closed up fully, the inboard of two interior legs 4 and bipod arm 2 (10) fit together respectively, and this moments two, the rule points lumped together, and the radius of compasses is approximately zero.

As shown in Figure 1, when opening two legs because of interior leg root have intermeshing with the pitch circle partial gear guarantee two legs be installed on clamping plate 6 tops handle 8 center line all the time the symmetry; Pin arm 2, outer leg 3, interior leg 4, latch plate 9 because of compasses constitutes the both sides that two parallelogram are symmetrical in clamping plate 6 respectively again; Parallelogram have structural instability and when the adjacent edge variable angle opposite side remain parallel characteristics, so pin arm 2 is symmetrical with 10 inboard center lines with handle 8 and remain parallel.One end of chi bar 5 is fixed on the pin arm 10, and the other end is curled in the chi box 1 that is fixed in another pin arm 2 and with wind spring and links to each other; Therefore, chi bar 5 is drawn out simultaneously when opening compass leg, and chi bar 5 was drawn in the chi box by wind spring when compass leg closed up, and the maximum scale of the chi bar that exposes is the radius of a circle that will draw.

Adjustment screw 7 is used for regulating the frictional force between rule leg 3 (4) and the latch plate 9 among the figure, guarantees that in that to draw the bowlder radius constant, dynamics is moderate during the adjustment radius.

Claims

1. the compasses of a mark are made of chi box, pin arm, outer leg, interior leg, chi bar, clamping plate, adjustment screw, handle and latch plate; It is characterized in that: the pin arm of compasses, outer leg, interior leg, latch plate constitute the parallelogram of two hinge arrangements respectively; Interior leg root has intermeshing with the pitch circle partial gear.

2. the compasses of mark according to claim 1, it is characterized in that: an end of chi bar is fixed on the pin arm, and the other end is curled in the chi box that is fixed on another pin arm and with wind spring and links to each other.