EP2108523A2 - Schnell zu öffnender Kompass - Google Patents

Schnell zu öffnender Kompass Download PDF

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Publication number
EP2108523A2
EP2108523A2 EP09157482A EP09157482A EP2108523A2 EP 2108523 A2 EP2108523 A2 EP 2108523A2 EP 09157482 A EP09157482 A EP 09157482A EP 09157482 A EP09157482 A EP 09157482A EP 2108523 A2 EP2108523 A2 EP 2108523A2
Authority
EP
European Patent Office
Prior art keywords
screw
screw thread
legs
nuts
compass
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP09157482A
Other languages
English (en)
French (fr)
Other versions
EP2108523A3 (de
Inventor
Hong Li Xiang
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Lorenz SNC Fabbrica Compassi Di Leporati Giovanni & C
Original Assignee
Lorenz SNC Fabbrica Compassi Di Leporati Giovanni & C
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Lorenz SNC Fabbrica Compassi Di Leporati Giovanni & C filed Critical Lorenz SNC Fabbrica Compassi Di Leporati Giovanni & C
Publication of EP2108523A2 publication Critical patent/EP2108523A2/de
Publication of EP2108523A3 publication Critical patent/EP2108523A3/de
Withdrawn legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B43—WRITING OR DRAWING IMPLEMENTS; BUREAU ACCESSORIES
    • B43L—ARTICLES FOR WRITING OR DRAWING UPON; WRITING OR DRAWING AIDS; ACCESSORIES FOR WRITING OR DRAWING
    • B43L9/00—Circular curve-drawing or like instruments
    • B43L9/02—Compasses
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B43—WRITING OR DRAWING IMPLEMENTS; BUREAU ACCESSORIES
    • B43L—ARTICLES FOR WRITING OR DRAWING UPON; WRITING OR DRAWING AIDS; ACCESSORIES FOR WRITING OR DRAWING
    • B43L9/00—Circular curve-drawing or like instruments
    • B43L9/16—Features common to compasses, dividers, and callipers
    • B43L9/18—Legs with toggle joints
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B43—WRITING OR DRAWING IMPLEMENTS; BUREAU ACCESSORIES
    • B43L—ARTICLES FOR WRITING OR DRAWING UPON; WRITING OR DRAWING AIDS; ACCESSORIES FOR WRITING OR DRAWING
    • B43L9/00—Circular curve-drawing or like instruments
    • B43L9/16—Features common to compasses, dividers, and callipers
    • B43L9/22—Leg-angle adjusting-means separate from pivots

Definitions

  • the present invention relates to a new practical compass.
  • Ordinary compasses usually are composed of a handle and two legs which are connected with the handle; there is a needle seat on bottom of one leg and a drawing pen or pencil seat on the other. Fix the needle as the centre of the circle, and then rotate the handle to draw arc with the drawing pen.
  • a new Chinese application n. 98241987.2 publish a compass that is easy to position. It is composed with two legs and axes on top of the legs. On top of one leg, there is a positioning axes. On one side of the position axes, there is a sliding gear, which could rotate around the position axes. There is a long hole on the sliding gear, and there is a screw on the other leg. There is a bolt to connect the long hole on the sliding gear and the screw on the other leg.
  • Compasses are also known with a transversal screw between the legs rotatable with a central wheel for fine positioning. Coupling between screw and nuts on the legs is irreversible. These compasses are slow to open and close. Disengaging elements can be provided between leg and screw, but in this case the movement of the legs become uncontrollable and fast and precise adjustment is impossible.
  • the technical difficulty this invention is aimed to solve is to provide a fast position compass based on currently available technology. With this compass, fast, accurate positioning and fine-turning regarding the control of the distance between legs of the compass are possible.
  • a fast open compass comprising a handle; a joint part which is connected to the handle; two legs that are connected to the joint part through a hinge; an adjusting screw between the said legs; and on both sides of the screw there are screw threads, left spin screw thread and right spin screw thread, respectively connected to nuts on both legs, characterized in that the angle of the left spin screw thread and the right spin screw thread of the screw is selected in such manner that the coupling between screw and nuts is reversible, so that when legs are been unfold or fold directly, the left spin screw thread and the right spin screw thread of the screw can be unlocked and rotated in each respective nuts.
  • the angle is in the range of 20-35°.
  • the left spin screw thread and right spin screw thread are designed in triple-start thread with teeth of trapezoidal shape.
  • One side of the presser foot is connected to the screw thread of the nut and the other side is connected to a spring on the leg.
  • the nuts are connected to the screw.
  • the nut departs from the screw.
  • this invention is a new fast open compass.
  • the fast open compass comprises a joint part 8.
  • On top of the joint part there is a handle 1 for user to hold.
  • the joint part 8 has two screw thread holes 81 and two legs 21, 22 connected with the joint part 8 by the bolt which goes through the screw thread holes 81.
  • the legs 21,22 comprise a top part and a bottom part. Between the top part and bottom part there is a bendable hinge.
  • the use of hinge could keep the leg vertical against the drawing board, therefore avoiding some problems that would occur while using the compass, for example the centre of circle often moves, the radius of the circle increases and the precision lowers.
  • the two legs 21 22 are respectively connected with needle 91, that is used to fix the centre of the circle, and pen 92, which is used to draw circle.
  • the screw 3 is divided into right and left parts, with left spin screw thread and right spin screw thread on them respectively.
  • the nuts 41, 42 are connected with the left spin screw thread 31 and the right spin screw thread 32 respectively.
  • the rise angle of the screw is selected in such manner that the coupling between screw and nuts is reversible.
  • the legs 21,22 are fold or unfold, the left spin screw thread 31 and the right spin screw thread 32 of the screw 3 could be unlocked and move against each respective nuts 41,42.
  • the rise angle of the left spin screw thread 31 and right spin screw 32 of the screw 3 is 20-35° (in particular 25-30° and, preferably, about 28°).This angle is larger than the angle of an ordinary irreversible fix connecting screw thread.
  • presser feet or lever on nuts 41,42 that could adjust the gap between the nuts 41,42 and screw 3, see figure 3 .
  • One side of the presser feet 61,62 is connected to the screw thread of the nuts 41,42, other side (button or command side) of the presser feet is connect to the springs 71,72 on the legs 21, 22.
  • the nut (41,42) is connected to the screw (3).
  • a button or command side of the presser foot (61,62) is pressed, the nut (41,42) will depart from the screw.
  • FIG. 5 is an illustration of structure of the nuts 41, 42 of the invention.
  • One side of the nut is open end 411 (421), other side 412 (422) connected to the presser foot 61, 62, there are inner screw thread 413 (423) on the open end 411 (421) of nuts 41, 42 which could be use to connect respectively with left spin screw thread 31 and right spin screw thread 32.
  • the open end 411 (421) of the nuts 41,42 is vertical to the screw 3.
  • This invention use an adjustable screw between legs and a relatively large rise angle is used in the design of this screw. This make it possible to apply relatively small force to overcome the resistance to pull the screw out of or push it into the nuts straight way, therefore it making possible a fast and precise guided positioning.
  • the wheel 5 is manually rotated.
  • the legs can be pulled or pushed and the reversible coupling between the screw 3 and nuts 41, 42 causes corresponding rotation of the screw 3.
  • the "frictional" effect of the reversible coupling aids the precise positioning of the leg ends.
  • this effect avoids the uncontrolled free movement of the legs when the compass is in use. In particular, the effect is better when it has an angle in the range of 20-35°.
  • the presser foot can be used.

Landscapes

  • Prostheses (AREA)
  • Pivots And Pivotal Connections (AREA)
  • Transmission Devices (AREA)
  • Details Of Measuring And Other Instruments (AREA)
EP09157482A 2008-04-11 2009-04-07 Schnell zu öffnender Kompass Withdrawn EP2108523A3 (de)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CNU2008200854793U CN201179797Y (zh) 2008-04-11 2008-04-11 快拉圆规

Publications (2)

Publication Number Publication Date
EP2108523A2 true EP2108523A2 (de) 2009-10-14
EP2108523A3 EP2108523A3 (de) 2009-11-18

Family

ID=40249300

Family Applications (1)

Application Number Title Priority Date Filing Date
EP09157482A Withdrawn EP2108523A3 (de) 2008-04-11 2009-04-07 Schnell zu öffnender Kompass

Country Status (2)

Country Link
EP (1) EP2108523A3 (de)
CN (1) CN201179797Y (de)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2011147594A1 (de) 2010-05-28 2011-12-01 Draw.Tec Gmbh & Co. Kg Schnellverstellzirkel mit spindelführung

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE7633841U1 (de) * 1976-10-28 1977-03-10 Dietzgen Europe Gmbh, 8500 Nuernberg Teilzirkel mit schnellverstellung
DE3007571A1 (de) * 1980-02-28 1981-09-10 Intercompass Import u. Export-Gesellschaft mbH, 8531 Wilhelmsdorf Schnellverstellzirkel
DE3606572C1 (en) * 1986-02-28 1987-01-02 Intertech Zeichengeraete Guent Fast-adjustment compass

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2011147594A1 (de) 2010-05-28 2011-12-01 Draw.Tec Gmbh & Co. Kg Schnellverstellzirkel mit spindelführung
CN102985265A (zh) * 2010-05-28 2013-03-20 制图技术有限及两合公司 具有丝杆导向体的速调圆规
CN102985265B (zh) * 2010-05-28 2015-05-27 制图技术有限及两合公司 具有丝杆导向体的速调圆规

Also Published As

Publication number Publication date
CN201179797Y (zh) 2009-01-14
EP2108523A3 (de) 2009-11-18

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