CN103895420B - Multiple proportions compasses - Google Patents

Multiple proportions compasses Download PDF

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Publication number
CN103895420B
CN103895420B CN201410159964.0A CN201410159964A CN103895420B CN 103895420 B CN103895420 B CN 103895420B CN 201410159964 A CN201410159964 A CN 201410159964A CN 103895420 B CN103895420 B CN 103895420B
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CN
China
Prior art keywords
leg
convex
recessed
connection
coupling
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CN201410159964.0A
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Chinese (zh)
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CN103895420A (en
Inventor
江有永
项春
施高萍
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浙江水利水电学院
江有永
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Priority to CN201410159964.0A priority Critical patent/CN103895420B/en
Publication of CN103895420A publication Critical patent/CN103895420A/en
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Publication of CN103895420B publication Critical patent/CN103895420B/en

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Abstract

The present invention relates to a kind of multiple proportions compasses.The object of this invention is to provide and a kind ofly can find the mid point of one section of straight line fast and accurately or the center of circle that is diameter with this section of straight line, not carry out taking advantage of 2 or just can complete the drawing of 2:1 or 1:2 ratio fast and accurately, the multiple proportions compasses of thickness pencil-lead can be exchanged fast and accurately except the computing of 2.Technical scheme of the present invention is: convex connection compass leg and recessed connection compass leg are that X-shaped is crossing and can relatively rotate around point of intersection axis, axis is 1:2 apart from the distance ratio at convex connection compass leg two ends and recessed connection compass leg two ends, be provided with thickness pencil-lead conversion equipment, the plane of the plane of the semi-round ball of convex coupling and the semi-round ball of recessed coupling is pasted and is combined into complete ball.Namely the present invention is suitable for drawing teaching and the drawing of school, is also suitable for enterprises and institutions staff and draws use.

Description

Multiple proportions compasses
Technical field
The present invention relates to a kind of compasses, particularly a kind of multiple proportions compasses.
Background technology
Draw or drawing course teaching process in, compasses are used to carry out the indispensable instrument drawing circle or circular arc, are usually used in construction with ruler and compasses.But in drawing course, often can run into the problem how existing one section of straight line determines its mid point, in known technology, way has two kinds: 1, first measure this line segment length, after carry out except 2 computings, then with existing line segment one end for benchmark carries out measuring acquisition mid point; The method is wanted to measure size 2 times, the precision measured will depend on the precision of measurer used, and the precision of scale on set square, ruler, T-square etc. conventional in drafting instrument is accurate to millimeter more, measure the error that all can produce less than one 1 millimeters at every turn, in addition, the middle computing also will carried out except 2, in this way precision is not high in institute, and takes energy, time-consuming.2, need to do boost line, compasses pin end is used to overlap line segment one end therewith, to be greater than the length of this line segment half for radius, one section of circular arc is respectively painted on these line segment both sides, and then allow pin end overlap with the line segment other end, respectively paint one section of circular arc with same radius on these line segment both sides, this four arcs forms two intersection points, the intersection point connecting these two intersection points and the middle line segment i.e. mid point of line segment for this reason, the method step is more, and step is more time-consuming, the more accumulated errors therebetween of step are larger, the mid point of this section of straight line is only needed during mapping, and these four sections of auxiliary circular arcs also need erasing after finding mid point, comparatively bother, and it is time-consuming, sometimes also wipe unclean, make whole drawing more dirty and messy, in addition, when painting the first two circular arc, owing to not knowing with the intersection point of two circular arcs in back where, if the circular arc drawn is short, draw below two circular arcs time likely just can not form two intersection points, also to return to and repaint two circular arcs above, if the length of two circular arc pictures above, to increase the success rate crossing with two circular arc lines below, that is again for erasing work below adds workload, visible the method is time-consuming, effort, precision is not high again.
In addition in drawing course, often need circle or the circular arc of drawing heavy line, the circle of fine line or dotted line or dotted line or circular arc, and to draw the circle of solid line or circular arc be that the pencil-lead of requirement compasses is selected soft and thick, and to draw the circle of fine line or dotted line or dotted line or circular arc be that the pencil-lead of requirement compasses is selected hard and thin, how speed and convenience thick the or thin pencil-lead of conversion just become a problem anxious to be resolved, the patent No. is the utility model patent of 200420015756.5: Twin core pencil compasses, it is characterized in that the main pin of compasses is fixed with double end lead for retractable pencil pin by nut, thickness lead for retractable pencil is fixed with by cap bag in the two ends of double end lead for retractable pencil pin, this technology can realize circle or the circular arc of picture thickness two kinds of lines by rotating double end lead for retractable pencil pin, but first to unscrew nut during conversion double end lead for retractable pencil pin, rotate double end lead for retractable pencil pin again to correct position, tightening nuts again, just can complete the conversion of thickness lead for retractable pencil, still more time-consuming, effort, and double end lead for retractable pencil pin is difficult to turn to correct position, even if this structure turns to correct position, in drawing course, double end lead for retractable pencil also rotates than being easier to, affect the drafting accuracy of compasses.
In drawing course, also often there will be these problems: how the one section of straight line 1, existed, for will draw diameter of a circle, finds the center of circle when not measuring length fast and accurately.2, how known one section of straight line, find mid point fast and accurately when not measuring length.When 3, using 2:1 or 1:2 ratio to draw, do not carry out taking advantage of 2 or just can complete the drawing of 2:1 or 1:2 ratio fast and accurately except the computing of 2.How 4 can exchange thickness pencil-lead fast and accurately.These are all the problems that drawing personnel and drawing educator will solve.
Summary of the invention
The technical problem to be solved in the present invention is: provide a kind of for above-mentioned Problems existing and can find the mid point of one section of straight line fast and accurately or the center of circle that is diameter with this section of straight line, not carry out taking advantage of 2 or just can complete the drawing of 2:1 or 1:2 ratio fast and accurately, can exchange the multiple proportions compasses of thickness pencil-lead fast and accurately except the computing of 2.
The technical solution adopted in the present invention is: multiple proportions compasses comprise convex connection compass leg, and with convex connection compass leg be X-shaped crossing and can around point of intersection axis in relative rotation recessed connection compass leg form, described convex connection compass leg is separated convex connection long leg and convex connection short-leg by the convex coupling that semicircle is spherical, the central axis of the semi-round ball of convex coupling apart from the distance at convex connection compass leg two ends than being 1:2, described recessed connection compass leg is separated recessed connection long leg and convex connection short-leg by the recessed coupling that semicircle is spherical, the central axis of the semi-round ball of recessed coupling apart from the distance at recessed connection compass leg two ends than being 1:2.
The semi-round ball plane side of described convex coupling arranges columnar turning cylinder, and the end of turning cylinder arranges single spin canting projection, and turning cylinder and single spin canting projection arrange the oblique grooving with turning cylinder dead in line.
According to the multiple proportions compasses shown in claim 2, it is characterized in that: described grooving is 30 ~ 60 degree with the convex angle connecting long leg or convex connection short-leg.
The plane of the semi-round ball of described convex coupling is parallel with the front and back of convex connection short-leg with convex connection long leg and be positioned at the centre position of front and back, and the left side and the convex right side connecting short-leg of convex connection long leg are located across the same plane of the central axis of the semi-round ball of convex coupling.
The plane of the semi-round ball of described recessed coupling is parallel with the front and back of recessed connection short-leg with recessed connection long leg and be positioned at the centre position of front and back, and the left side and the recessed right side connecting short-leg of recessed connection long leg are located across the same plane of the central axis of the semi-round ball of recessed coupling.
The semi-round ball plane side of described recessed coupling arranges the circular hole with turning cylinder same diameter and length, the end of circular hole arranges the single spin canting groove identical with shape with single spin canting bump sizes, turning cylinder and single spin canting projection penetrate in circular hole and single spin canting groove to be formed and are hinged, and the plane of the semi-round ball of convex coupling and the semi-round ball plane of recessed coupling are fitted formation one ball.
The end of described convex connection long leg and convex connection short-leg arranges thickness pencil-lead conversion equipment, the end of convex connection short-leg and recessed connection long leg arranges compasses pin, and compasses pin top overlaps with the convex median surface connected between the medial surface of short-leg and recessed connection long leg and front-back.
Described thickness pencil-lead conversion equipment comprises two pen core sleeve, spring, acorn nut, and the vertical orientation that described two ends are socketed two pen core sleeves of lead bullion pen core and thin pencil-lead respectively arranges turning cylinder, and turning cylinder end arranges screw thread.
Described convex connection long leg and convex connection short-leg end arrange the groove that can embed two pen core sleeves, turning cylinder penetrates convex connection long leg or convex connection short-leg, two pen core sleeve is made to embed groove, turning cylinder again through spring, all screw threads of acorn nut and turning cylinder end thread screw completely to revolve motionless.
The invention has the beneficial effects as follows: 1, convex connection compass leg of the present invention and recessed connection compass leg are that X-shaped is crossing and can relatively rotate around point of intersection axis, axis is 1:2 apart from the distance ratio at convex connection compass leg two ends and recessed connection compass leg two ends, material is thus formed the compasses of two routine techniques, and these two compasses positions are opposing, and link, wherein the compasses on one side rotate an angle, also an identical angle can be rotated with those compasses of its opposing another side, but they paint circle or circular arc is just greatly different, those compasses of long leg paint circle or circular arc radius be exactly that those compasses of short-leg institute paints and justifies or 2 times of radius of circular arc, the present invention can find the mid point of one section of straight line or the center of circle that is diameter with this section of straight line fast and accurately, do not carry out taking advantage of 2 or just can complete the drawing of 2:1 or 1:2 ratio fast and accurately except the computing of 2.2, the present invention is provided with thickness pencil-lead conversion equipment, if need lead bullion pen core to convert thin pencil-lead to, only acorn nut need be pressed, acorn nut is with regard to Compress Spring, two pen core sleeve is moved, depart from groove, rotate clockwise acorn nut and then drive two pen core sleeve to rotate, two pen core sleeve turn to thin pencil-lead outside time unclamp acorn nut, two pen core sleeve is just because the effect of spring returns again and remains in groove, whole process, for pressing, rotating, loose one's grip and can complete, has exchanged thickness pencil-lead fast and accurately.3, convex coupling of the present invention and recessed coupling all spherical in semicircle, when the present invention works, the plane of the plane of the semi-round ball of convex coupling and the semi-round ball of recessed coupling is pasted and is combined into complete ball, hand pinches this ball, just there is the focusing surface of exerting oneself downward or upward, also this ball be can rotate and circle or circular arc drawn out to rotate the present invention, and it is large or little regardless of the angle of opening between the present invention two leg, X-shaped intersection is a spheroidal all the time, shape can not change, hand is pinched feel of the present invention and can not to be changed, make draw before and after be consistent, ensure the result of use of the present embodiment.
Accompanying drawing explanation
Fig. 1 is schematic perspective view of the present invention.
Fig. 2 is the schematic perspective view of convex connection compass leg of the present invention.
Fig. 3 is the orthographic projection view of convex connection compass leg of the present invention.
Fig. 4 is the schematic perspective view of recessed connection compass leg of the present invention.
Fig. 5 is the convex connection compass leg schematic perspective view removing thickness pencil-lead conversion equipment of the present invention.
Fig. 6 is the schematic perspective view of of the present invention pair of pen core sleeve.
Fig. 7 is the explosive view of thickness pencil-lead conversion equipment of the present invention.
Detailed description of the invention
As shown in Figure 1, the present embodiment comprises convex connection compass leg 1, and with convex connection compass leg 1 in X-shaped crossing also can around point of intersection axis in relative rotation recessed connection compass leg 2 form, material is thus formed the compasses of two routine techniques, and these two compasses positions are opposing, and link, compasses wherein rotate an angle, an identical angle also can be rotated with those compasses of its opposing another side, described convex connection compass leg 1 is separated convex connection long leg 5 and convex connection short-leg 6 by the convex coupling 3 that semicircle is spherical, the central axis of the semi-round ball of convex coupling 3 apart from the distance at convex connection compass leg 1 two ends than being 1:2, described recessed connection compass leg 2 is separated recessed connection long leg 7 and convex connection short-leg 8 by the recessed coupling 4 that semicircle is spherical, the central axis of the semi-round ball of recessed coupling 4 apart from the distance at recessed connection compass leg 2 two ends than being 1:2, the angle that opposing and two compasses on both sides that are interlock in position open is identical, if leg is long the same, so they paint circle or circular arc be equal, the radius of circle or circular arc is equal, if the long ratio of leg is 1:2, so they paint circle or circular arc is just greatly different, those compasses of long leg paint circle or circular arc radius be exactly that those compasses of short-leg institute paints and justifies or 2 times of radius of circular arc.
As shown in Figures 2 to 4, the semi-round ball plane side of convex coupling 3 arranges columnar turning cylinder 9, the end of turning cylinder 9 arranges single spin canting projection 10, the semi-round ball plane side of recessed coupling 4 arranges the circular hole 12 with turning cylinder 9 same diameter and length, the end of circular hole 12 arranges the identical single spin canting groove 13 of 10 size and dimensions protruding with single spin canting, turning cylinder 9 and single spin canting projection 10 penetrate in circular hole 12 and single spin canting groove 13 to be formed and are hinged, in X-shaped, the crossing moving axis 9 that also can rotate relatively rotates with recessed connection compass leg 2 to realize convex connection compass leg 1, and when rotating can not there is axial displacement with recessed connection compass leg 2 or be separated in convex connection compass leg 1, radial skew can not be there is, so require that the semi-round ball plane side of recessed coupling 4 arranges the circular hole 12 with turning cylinder 9 same diameter and length, the end of circular hole 12 arranges the identical single spin canting groove 13 of 10 size and dimensions protruding with single spin canting, and the external diameter of single spin canting projection 10 is greater than the diameter of circular hole 12, if single spin canting projection 10 will enter single spin canting groove 13 through circular hole 12, must elastic deformation be there is in so single spin canting projection 10, and turning cylinder 9 and single spin canting projection 10 are set to cylindrical shape, turning cylinder 9 and single spin canting projection 10 arrange the oblique grooving 11 with turning cylinder 9 dead in line, this just for this reason elastic deformation reserved the space of distortion, single spin canting projection 10 can inwardly be occurred, and diameter that elastic deformation equals circular hole 12 enters single spin canting groove 13 through circular hole 12, single spin canting projection 10 enters single spin canting groove 13 and restores, because single spin canting protruding 10 is single spin canting with single spin canting groove 13, when single spin canting projection 10 enters circular hole 12, this spin canting can play a part to guide single spin canting protruding 10 inwardly elastic deformation to occur, after single spin canting projection 10 enters the recovery of single spin canting groove 13, because another side does not have spin canting, even if having between convex connection compass leg 1 with recessed connection compass leg 2, the interactional axial force be axially separated is existed, because the diameter of protruding 10 is greater than the diameter of circular hole 12, can not elastic deformation be there is in single spin canting projection 10, so convex connection compass leg 1 can keep stable with recessed connection between compass leg 2 axis.
As shown in Figure 3, turning cylinder 9 and single spin canting projection 10 arrange the oblique grooving 11 with turning cylinder 9 dead in line, grooving 11 is 30 ~ 60 degree with the convex angle connecting long leg 5 or convex connection short-leg 6, when drawing circle or circular arc, on the cylinder that hand-held convex coupling 3 and the downward active force of recessed coupling 4 can act on turning cylinder 9 instead of act between grooving 11, radial skew can not be there is, the stability that compasses keep higher can be made like this, higher precision.
As shown in Figure 3 to Figure 4, the plane of the semi-round ball of convex coupling 3 is parallel with the front and back of convex connection short-leg 6 with convex connection long leg 5 and be positioned at the centre position of front and back, the left side of convex connection long leg 5 is located across the same plane of the central axis of the semi-round ball of convex coupling 3 with the convex right side connecting short-leg 6, the plane of the semi-round ball of recessed coupling 4 is parallel with the front and back of recessed connection short-leg 8 with recessed connection long leg 7 and be positioned at the centre position of front and back, the left side of recessed connection long leg 7 is located across the same plane of the central axis of the semi-round ball of recessed coupling 4 with the recessed right side connecting short-leg 8, compasses pin 15 top overlaps with the convex median surface connected between the medial surface of short-leg 6 and recessed connection long leg 7 and front-back, thus ensure pencil-lead summit and compasses pin 15 summit at convex connection compass leg 1 two ends, the pencil-lead summit at recessed connection compass leg 2 two ends and compasses pin 15 summit, these 5, the centre of sphere of the complete ball that the semi-round ball of convex coupling 3 and the semi-round ball of recessed coupling 4 form is positioned at same plane, convex connection compass leg 1 with recessed connect compass leg 2 rotate time, two ends can remain circle or the arc radius relation of 1:2.
The end of convex connection long leg 5 and convex connection short-leg 8 arranges thickness pencil-lead conversion equipment 14, the end of convex connection short-leg 6 and recessed connection long leg 7 arranges compasses pin 15, compasses pin 15 is made to be positioned at the same side of the present embodiment, if on the right side of long leg end compasses be compasses pin 15 in use, when rotation comes to use short-leg to draw roundlet or small arc-shaped, still for right side is that compasses pin 15 is so more handy, efficiency is higher.
Thickness pencil-lead conversion equipment 14 comprises two pen core sleeve 16, spring 17, acorn nut 18 as shown in Figures 5 to 7, the vertical orientation that described two ends are socketed two pen core sleeves 16 of lead bullion pen core 19 and thin pencil-lead 20 respectively arranges turning cylinder 21, turning cylinder 21 end arranges screw thread, convex connection long leg 5 and convex connection short-leg 8 end arrange the groove 22 that can embed two pen core sleeves 16, when changing thickness pencil-lead conversion equipment 14, thickness pencil-lead conversion equipment 14 screens fast and accurately can be made, ensure that the precision of drawing, improve service efficiency; Turning cylinder 21 penetrates convex connection long leg 5 or convex connection short-leg 8, two pen core sleeve 16 is made to embed groove 22, turning cylinder 21 is again through spring 17, all screw threads and turning cylinder 21 end thread of acorn nut 18 screw completely, because acorn nut 18 1 open face are closed, if all screw threads of acorn nut 18 and turning cylinder 21 end thread screw completely to revolve motionless, so.Turning cylinder 21 and acorn nut 18 revolve extremely completely, and acorn nut 18 rotates clockwise, and can not relatively rotate between turning cylinder 21 and acorn nut 18 again, and turning cylinder 21 must along with rotating together, and then drive thickness pencil-lead conversion equipment 14 to rotate together, when the present embodiment needs to draw the circle of heavy line or circular arc, the lead bullion pen core 19 of thickness pencil-lead conversion equipment 14 is outside, thin pencil-lead 20 is interior, if when drawing circle or the circular arc of fine line or dotted line or dotted line, use thin pencil-lead, make thin pencil-lead 20 outside, lead bullion pen core 19 is interior, two pen core sleeve 16 will be changed, now, pressing acorn nut 18, acorn nut 18 is with regard to Compress Spring 17, two pen core sleeve 16 is moved, depart from groove 22, rotate clockwise acorn nut 18 and then drive two pen core sleeve 16 to rotate, two pen core sleeve 16 turn to thin pencil-lead 20 outside time unclamp acorn nut 18, two pen core sleeve 16 is just because the effect of spring 17 returns again and remains in groove 22.
There is a vertical turning handle rotating shaft upper end of the compass leg intersection of conventional art compasses, hand is pinched turning handle and is rotated turning handle to draw circle or circular arc, and the present embodiment be X-shaped intersect, just without the turning handle of completely technology compasses, and the convex coupling 3 of the present embodiment and recessed coupling 4 are all spherical in semicircle, during the present embodiment work, the plane of the plane of the semi-round ball of convex coupling 3 and the semi-round ball of recessed coupling 4 is pasted and is combined into complete ball, hand pinches this ball, just there is the focusing surface of exerting oneself downward or upward, also this ball be can rotate and circle or circular arc drawn out to rotate the present embodiment, and it is large or little regardless of the angle of opening between the present embodiment two leg, X-shaped intersection is a spheroidal all the time, shape can not change, hand is pinched the present embodiment feel and can not to be changed, make draw before and after be consistent, ensure the result of use of the present embodiment.
If existed one section of straight line will be for will draw diameter of a circle, when not measuring length, the present embodiment is used to find the embodiment in the center of circle to be fast and accurately: to use the present embodiment, the pin summit of recessed connection long leg 7 and convex connection long leg 5 end and pencil-lead summit are placed on the two ends of this section of straight line, namely distance between the pin summit of convex connection short-leg 6 and recessed connection short-leg 8 end and pencil-lead summit is the radius of this section of straight line, the pencil-lead summit of recessed connection short-leg 8 end therewith section straight line one end overlap, the position of this section of straight line in place, pin summit of convex connection short-leg 6 end is the center of circle, namely can this section of straight line be that diameter carries out drafting circle or circular arc.
If known one section of straight line, when not measuring length, the present embodiment is used to find the embodiment of mid point to be fast and accurately: to use the present embodiment, the pin summit of recessed connection long leg 7 and convex connection long leg 5 end and pencil-lead summit are placed on the two ends of this section of straight line, namely distance between the pin summit of convex connection short-leg 6 and recessed connection short-leg 8 end and pencil-lead summit is the half of this section of straight length, the pin summit of convex connection short-leg 6 end therewith section straight line one end overlap, the intersection point of the pencil-lead summit of recessed connection short-leg 8 end section straight line is therewith mid point, namely can this section of straight line be that diameter carries out drafting circle or circular arc.
When using 2:1 ratio to draw, when not carrying out the computing taking advantage of 2, the embodiment using the present embodiment to complete 2:1 scale is fast and accurately: according to drawings marked size, use the top of convex connection short-leg 6 and recessed connection short-leg 8 to measure length or radius, the plane that hand pinches the plane of the semi-round ball of convex coupling 3 and the semi-round ball of recessed coupling 4 pastes the complete ball be combined into, and uses the top of recessed connection long leg 7 and convex connection long leg 5 indicate at the enterprising line length of drawing or draw circle or circular arc.
When using 1:2 ratio to draw, when not carrying out the computing removing 2, the embodiment using the present embodiment to complete 1:2 scale is fast and accurately: according to drawings marked size, use the top of recessed connection long leg 7 and convex connection long leg 5 to measure length or radius, the plane that hand pinches the plane of the semi-round ball of convex coupling 3 and the semi-round ball of recessed coupling 4 pastes the complete ball be combined into, and uses the top of convex connection short-leg 6 and recessed connection short-leg 8 indicate at the enterprising line length of drawing or draw circle or circular arc.
Namely the present invention is suitable for drawing teaching and the drawing of school, is also suitable for enterprises and institutions staff and draws use.

Claims (4)

1. multiple proportions compasses, comprise convex connection compass leg (1), and with convex connection compass leg (1) in X-shaped crossing and can around point of intersection axis in relative rotation recessed connection compass leg (2) form, convex connection compass leg (1) is separated convex connection long leg (5) and convex connection short-leg (6) by the convex coupling (3) that semicircle is spherical, the central axis of the semi-round ball of convex coupling (3) apart from the distance at convex connection compass leg (1) two ends than being 1:2, recessed connection compass leg (2) is separated recessed connection long leg (7) and convex connection short-leg (8) by the recessed coupling (4) that semicircle is spherical, the central axis of the semi-round ball of recessed coupling (4) apart from the distance at recessed connection compass leg (2) two ends than being 1:2, the semi-round ball plane side of convex coupling (3) arranges columnar turning cylinder (9), the end of turning cylinder (9) arranges single spin canting projection (10), the oblique grooving (11) of turning cylinder (9) and the upper setting of single spin canting projection (10) and turning cylinder (9) dead in line, the end of convex connection long leg (5) and convex connection short-leg (8) arranges thickness pencil-lead conversion equipment (14), the end of convex connection short-leg (6) and recessed connection long leg (7) arranges compasses pin (15), compasses pin (15) top overlaps with the convex median surface connected between the medial surface of short-leg (6) and recessed connection long leg (7) and front-back, it is characterized in that: described grooving (11) is 30 ~ 60 degree with the convex angle connecting long leg (5) or convex connection short-leg (6),
The plane of the semi-round ball of described convex coupling (3) is parallel with the front and back of convex connection short-leg (6) with convex connection long leg (5) and be positioned at the centre position of front and back, and the left side and the convex right side connecting short-leg (6) of convex connection long leg (5) are located across the same plane of the central axis of the semi-round ball of convex coupling (3);
The plane of the semi-round ball of described recessed coupling (4) is parallel with the front and back of recessed connection short-leg (8) with recessed connection long leg (7) and be positioned at the centre position of front and back, and the left side and the recessed right side connecting short-leg (8) of recessed connection long leg (7) are located across the same plane of the central axis of the semi-round ball of recessed coupling (4).
2. according to the multiple proportions compasses shown in claim 1, it is characterized in that: the semi-round ball plane side of described recessed coupling (4) arranges the circular hole (12) with turning cylinder (9) same diameter and length, the end of circular hole (12) arranges the single spin canting groove (13) identical with single spin canting projection (10) size and dimension, turning cylinder (9) and single spin canting projection (10) penetrate in circular hole (12) and single spin canting groove (13) to be formed and are hinged, the plane of the semi-round ball of convex coupling (3) and the semi-round ball plane of recessed coupling (4) are fitted formation one ball.
3. according to the multiple proportions compasses shown in claim 1, it is characterized in that: described thickness pencil-lead conversion equipment (14) comprises two pen core sleeve (16), spring (17), acorn nut (18), the vertical orientation that described two ends are socketed two pen core sleeves (16) of lead bullion pen core (19) and thin pencil-lead (20) respectively arranges turning cylinder (21), and turning cylinder (21) end arranges screw thread.
4. according to the multiple proportions compasses shown in claim 1, it is characterized in that: described convex connection long leg (5) and convex connection short-leg (8) end arrange the groove (22) that can embed two pen core sleeves (16), turning cylinder (21) penetrates convex connection long leg (5) or convex connection short-leg (8), two pen core sleeve (16) is made to embed groove (22), turning cylinder (21) again through spring (17), all screw threads of acorn nut (18) and turning cylinder (21) end thread screw completely to revolve motionless.
CN201410159964.0A 2014-04-22 2014-04-22 Multiple proportions compasses CN103895420B (en)

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Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE202134C (en) *
US2560697A (en) * 1946-12-16 1951-07-17 Joy Mfg Co Proportional divider
US2770884A (en) * 1953-08-03 1956-11-20 Joseph F Eckert Measuring instrument
GB1039636A (en) * 1964-08-11 1966-08-17 Maurice Kidjel Proportional calipers
CN2673667Y (en) * 2004-02-13 2005-01-26 周勇 Twin core pencil compasses
CN203792970U (en) * 2014-04-22 2014-08-27 浙江水利水电学院 Multiple proportional compasses

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH075792U (en) * 1993-06-29 1995-01-27 博 西田 Proportional compass

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE202134C (en) *
US2560697A (en) * 1946-12-16 1951-07-17 Joy Mfg Co Proportional divider
US2770884A (en) * 1953-08-03 1956-11-20 Joseph F Eckert Measuring instrument
GB1039636A (en) * 1964-08-11 1966-08-17 Maurice Kidjel Proportional calipers
CN2673667Y (en) * 2004-02-13 2005-01-26 周勇 Twin core pencil compasses
CN203792970U (en) * 2014-04-22 2014-08-27 浙江水利水电学院 Multiple proportional compasses

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