EP0020291B1 - Supporting element to be fixed on the extremity of a drawing compass's leg - Google Patents

Supporting element to be fixed on the extremity of a drawing compass's leg Download PDF

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Publication number
EP0020291B1
EP0020291B1 EP19800810119 EP80810119A EP0020291B1 EP 0020291 B1 EP0020291 B1 EP 0020291B1 EP 19800810119 EP19800810119 EP 19800810119 EP 80810119 A EP80810119 A EP 80810119A EP 0020291 B1 EP0020291 B1 EP 0020291B1
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EP
European Patent Office
Prior art keywords
receptacle
stud
writing
compass
leg
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.)
Expired
Application number
EP19800810119
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German (de)
French (fr)
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EP0020291A1 (en
Inventor
Roman Etter
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.)
Leica Aarau AG
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Kern and Co AG
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Publication date
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Publication of EP0020291A1 publication Critical patent/EP0020291A1/en
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Publication of EP0020291B1 publication Critical patent/EP0020291B1/en
Expired legal-status Critical Current

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    • 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
    • B43L9/24—Means for mounting points or writing appliances on legs

Definitions

  • the present invention relates to an attachment for compasses for attaching a writing or drawing device, in particular a tube recorder, to the compass with an attachment piece fitting in its writing leg and a receiving part for the writing or drawing device.
  • a known approach of this type for tube recorders receives the tube recorder in a thread on one side and can be fitted or clamped into the writing leg of the compass by means of an extension piece on the other side.
  • this approach difficulties arise when drawing small circles because the dimensions of the tube recorder make it difficult to set small radii, the compass tip and the writing tip have to be attached at the same time, and because the pressure on the writing tip is difficult to meter.
  • the writing tip often hooks onto the writing pad, so that the compass tip is torn out of the puncture point and moved around the writing tip.
  • the object of the present invention is therefore to provide an approach of the type mentioned for normal circles, which enables the use of tube recorders for drawing circles of any radius down to zero while avoiding the above-mentioned difficulties in a simple and clean manner.
  • a solution to this problem is according to the invention that the receiving part on the extension piece is slidably mounted in the longitudinal direction, that guide means are provided which prevent rotation between the receiving part and the extension piece, and that means for locking the sliding receiving part with respect to the extension piece are present.
  • a variant of this solution is characterized in that the receiving part is designed as a cylindrical socket, which is self-lockingly guided in the attachment piece by means of a steep thread in such a way that it can be lowered automatically onto the writing pad by its weight or by spring pressure while rotating, and that means for Locking the movable receiving part with respect to the extension piece are present.
  • the displacement range for the part receiving the tube recorder is preferably dimensioned such that, with the smallest circle spread, the writing tip of the tube recorder can both be raised above the circle tip and lowered.
  • the writing tip is expediently held in the working position of the compass by the weight of the tube pen and the movable part on the writing pad.
  • the compass shown in FIG. 1 has a first leg 2 carrying the compass tip 1 and a writing leg 5 carrying the writing tip 3 of a tube recorder 4. These legs are articulated in a known manner by a head 6, and their spread can be finely adjusted via a screw 7. The legs 2 and 5 can be bent at points 8 and 9.
  • the tube recorder 4 is screwed into the opening 10 of a receiving part 11, which is shown in detail in FIG.
  • the part 11 is, according to the invention, slidably mounted on a shoulder part 12.
  • the cylindrical extension part 12 is inserted into the writing leg 5 via a known coupling 13.
  • the displacement path of part 11 on extension 12 is limited at the top by a shoulder 14 of extension 12 and down by a guide part 16 fastened by means of a knurled screw 15 .
  • the guide part 16 secures the part 11 against rotation on the extension part 12 by engaging its guide opening 18 from below (see FIG. 2).
  • the part 11 can be locked against longitudinal displacement on the extension part 12 by a plug pin 19.
  • Fig. 2 shows a partial section through the part 11 at the height of the spigot 19.
  • This spigot 19 has a milled wedge surface 20 so that the end part 12 fitted into the opening 22 of the part 11 is clamped by pressure on the end 21 and under pressure the head 23 is released again at the other end of the pin 19.
  • the guide part 16 sliding in the opening 18 can also be replaced by a pin fixed in the opening 18, which then slides in a guide secured by the screw 15 on the attachment part 12.
  • the part 11 is now shifted so that the writing tip 3 of the tube recorder 4 is located above the circular tip 1 and cannot touch the same when the center of the circle is located on the writing pad. In this position, the part 11 is clamped by means of the plug pin 19. After setting the radius of the circle with the screw spindle 7 and inserting the compass tip 1 into the center of the circle, the pin 19 is loosened and the writing tip 3 is lowered onto the writing pad, on which it remains due to the weight of tube recorder 4 and part 11 with the appropriate contact pressure, regardless of inevitable small circle fluctuations around the position perpendicular to the desk pad.
  • the attachment part 12 itself already has a solid angular shape, while the part 11 receiving the tube recorder 4 is designed as a cylindrical socket with a handle attachment 24.
  • This socket is self-locking in the extension 12 by means of a steep thread 25 and is guided in such a way that its weight can be lowered automatically onto the writing pad by rotating it about the axis 26 and remains there with constant contact pressure.
  • To lift the tube recorder simply turn the handle attachment 24 and clamp the part 11 in the attachment piece 12 by means of a clamping screw 19 '.
  • the particular advantage of this variant compared to that described in relation to FIG. 2 is that a rotation-preventing guide means 16 and a tilting and play-prone degree guidance are avoided.
  • Fig. 4 shows an embodiment of the approach, which is similar to that shown in Fig. 1, but has a different clamping.
  • the tube recorder 4 is in turn screwed into the opening 10 of the part 11.
  • the part 11 is mounted on the extension part 12 by means of a bore 28 so as to be longitudinally displaceable.
  • the displacement of the part 11 on the extension part 12 is limited at the top by a spring ring 14 and at the bottom by a torsionally rigid guide part 16.
  • This guide part slides with a fork-shaped end along a guide pin 16 ', which is fixed in part 11 and fitted into the guide fork is.
  • the part 11 has a circular cylindrical, slightly eccentric to the bore 28. Extension 11 'of such a length that it just fills a rotatable cap 19 "which fits thereon.
  • the cap 19" also has an eccentric bore 27 for pushing through the extension 12, which is aligned with the bore 28 for an angular position. He also carries a tongue-shaped extension 30 of its edge, which engages over the part 11 and thereby prevents it from sliding out of the cap 19 ".
  • FIG. 4 a shows a view of the union 19 "in the direction of arrow 31.
  • a projection 32 is provided on the inner edge adjacent to the bore 27, which engages in an annular groove 33 on the upper edge thereof after insertion of the extension 11 'and thereby the rotation of the union 19 "is limited to the semicircular area of the annular groove 33.
  • the bore 27 moves because of its eccentric position relative to the bore 28 in the extension 11 'of the part 11 and thus causes the part 11 to be clamped against the extension part 12. This clamping is only released when the bores 27 and 28 in in the above-mentioned manner due to the angular position of the union 19 ".
  • the writing tip will be clamped in the usual position so that the radius cannot change when you draw in a manner known per se.

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  • Pens And Brushes (AREA)

Description

Die vorliegende Erfindung betrifft einen Ansatz für Zirkel zum Anbringen eines Schreib-oder Zeichengeräts, insbesondere eines Röhrchenschreibers, am Zirkel mit einem in dessen Schreibschenkel passenden Ansatzstück und einem Aufnahmeteil für das Schreib- oder Zeichengerät.The present invention relates to an attachment for compasses for attaching a writing or drawing device, in particular a tube recorder, to the compass with an attachment piece fitting in its writing leg and a receiving part for the writing or drawing device.

Ein bekannter Ansatz dieser Art für Röhrchenschreiber nimmt auf der einen Seite den Röhrchenschreiber in einem Gewinde auf und kann mittels eines an der anderen Seite befindlichen Ansatzstückes in den Schreibschenkel des Zirkels eingepaßt oder eingeklemmt werden. Mit diesem Ansatz ergeben sich beim Zeichnen kleiner Kreise Schwierigkeiten, weil die Abmessungen des Röhrchenschreibers das Einstellen kleiner Radien erschweren, Zirkelspitze und Schreibspitze gleichzeitig aufgesetzt werden müssen und weil der Druck auf die Schreibspitze schwer dosierbar ist. Infolgedessen hakt sich oft die Schreibspitze auf der Schreibunterlage fest, so daß die Zirkelspitze aus dem Einstichpunkt gerissen und um die Schreibspitze herum bewegt wird.A known approach of this type for tube recorders receives the tube recorder in a thread on one side and can be fitted or clamped into the writing leg of the compass by means of an extension piece on the other side. With this approach, difficulties arise when drawing small circles because the dimensions of the tube recorder make it difficult to set small radii, the compass tip and the writing tip have to be attached at the same time, and because the pressure on the writing tip is difficult to meter. As a result, the writing tip often hooks onto the writing pad, so that the compass tip is torn out of the puncture point and moved around the writing tip.

Zum Einstellen kleiner Radien mit einem derartigen Ansatz ist es bekannt, an einer geraden Stahlnadel eine kurze schräg abgebogene Zirkelspitze vorzusehen (vgl. DE-B-1 903 653). Durch Schrägstellung der Stahlnadel wird eine weitgehende Annäherung von Zirkelspitze und Schreibspitze trotz ungünstiger Abmessungen des Röhrchenschreibers erreicht. Hierdurch wird jedoch das Festhaken der Schreibspitze nicht vermieden.To set small radii with such an approach, it is known to provide a short, obliquely bent compass tip on a straight steel needle (cf. DE-B-1 903 653). By tilting the steel needle, the compass tip and the writing tip are largely brought together despite the unfavorable dimensions of the tube recorder. However, this does not prevent the pen from getting stuck.

Für Nullenzirkel mit Fallschaft ist auch bereits ein Ansatz bekannt, welcher sowohl das Einstellen kleiner Radien als auch das Absenken des Röhrchenschreibers erst nach dem Einstechen der Zirkelspitze ermöglicht (vgl. DE-C-1 561 393). Diese Anordnung ist jedoch ausschließlich für kleine Kreise geeignet.An approach is already known for zero circles with a drop shaft, which enables both setting small radii and lowering the tube recorder only after the circular tip has been inserted (cf. DE-C-1 561 393). However, this arrangement is only suitable for small circles.

Aufgabe der vorliegenden Erfindung ist es daher, einen Ansatz der eingangs genannten Art für normale Zirkel zu schaffen, welcher die Verwendung von Röhrchenschreibern für das Zeichnen von Kreisen beliebiger Radien bis zu Null herab unter Vermeidung der oben genannten Schwierigkeiten in einfacher und sauberer Weise ermöglicht.The object of the present invention is therefore to provide an approach of the type mentioned for normal circles, which enables the use of tube recorders for drawing circles of any radius down to zero while avoiding the above-mentioned difficulties in a simple and clean manner.

Eine Lösung dieser Aufgabe besteht erfindungsgemäß darin, daß das Aufnahmeteil am Ansatzstück in dessen Längsrichtung verschieblich gelagert ist, daß Führungsmittel vorgesehen sind, welche eine Drehung zwischen Aufnahmeteil und Ansatzstück verhindern, und daß Mittel zur Arretierung des verschieblichen Aufnahmeteils in bezug auf das Ansatzstück vorhanden ist. Eine Variante dieser Lösung zeichnet sich dadurch aus, daß das Aufnahmeteil als zylindrische Fassung ausgebildet ist, die im Ansatzstück mittels eines Steilgewindes selbsthemmungsfrei derart geführt ist, daß sie durch ihr Gewicht oder durch Federdruck unter Drehung selbsttätig auf die Schreibunterlage absenkbar ist, und daß Mittel zur Arretierung des verschieblichen Aufnahmeteils in bezug auf das Ansatzstück vorhanden sind.A solution to this problem is according to the invention that the receiving part on the extension piece is slidably mounted in the longitudinal direction, that guide means are provided which prevent rotation between the receiving part and the extension piece, and that means for locking the sliding receiving part with respect to the extension piece are present. A variant of this solution is characterized in that the receiving part is designed as a cylindrical socket, which is self-lockingly guided in the attachment piece by means of a steep thread in such a way that it can be lowered automatically onto the writing pad by its weight or by spring pressure while rotating, and that means for Locking the movable receiving part with respect to the extension piece are present.

Dabei ist der Verschiebungsbereich für das den Röhrchenschreiber aufnehmende Teil vorzugsweise derart bemessen, daß bei kleinster Zirkelspreizung die Schreibspitze des Röhrchenschreibers sowohl über die Zirkelspitze hinaus angehoben als auch abgesenkt werden kann. Die Schreibspitze wird zweckmäßig in der Arbeitsstellung des Zirkels durch das Gewicht von Röhrchenschreiber und verschieblichem Teil auf der Schreibunterlage gehalten.The displacement range for the part receiving the tube recorder is preferably dimensioned such that, with the smallest circle spread, the writing tip of the tube recorder can both be raised above the circle tip and lowered. The writing tip is expediently held in the working position of the compass by the weight of the tube pen and the movable part on the writing pad.

Durch die Mittel zur Arretierung des verschieblichen Teiles in bezug auf das Ansatzstück wird erfindungsgemäß beim Zeichnen größerer Kreise ein konstanter Abstand zwischen Zirkelspitze und Schreibspitze erreicht. Außerdem verhindert eine derartige Arretierung unbeabsichtigtes Absetzen der Schreibspitze, z. B. beim Aufsuchen der Mittelpunkte zu ziehender Kreise.Due to the means for locking the movable part with respect to the extension piece, a constant distance between compass tip and writing tip is achieved according to the invention when drawing larger circles. In addition, such a lock prevents accidental dropping of the writing tip, eg. B. when visiting the centers of circles to be drawn.

Die Erfindung wird nachfolgend anhand in der Zeichnung schematisch dargestellter Ausführungsbeispiele näher erläutert. Es zeigt

  • Fig. 1 eine Ansicht eines Zirkels mit einem erfindungsgemäßen Ansatz nebst Röhrchenschreiber,
  • Fig. 2 einen Teil des Ansatzes gemäß Fig. 1 im Teilschnitt mit Mitteln zu dessen Arretierung,
  • Fig. 3 eine Variante des Ansatzes mit Steilgewinde,
  • Fig. 4 eine Ausführungsform des Ansatzes mit einem Überwurf zur Klemmung und
  • Fig. 4a den Überwurf gem. Fig. 4 im Detail.
The invention is explained in more detail below with reference to exemplary embodiments schematically illustrated in the drawing. It shows
  • 1 is a view of a circle with an approach according to the invention together with tube recorders,
  • 2 a part of the approach according to FIG. 1 in partial section with means for locking it,
  • 3 shows a variant of the approach with steep thread,
  • Fig. 4 shows an embodiment of the approach with a cap for clamping and
  • Fig. 4a the wrap acc. Fig. 4 in detail.

Der in Fig. 1 dargestellte Zirkel weist einen die Zirkelspitze 1 tragenden ersten Schenkel 2 und einen die Schreibspitze 3 eines Röhrchenschreibers 4 tragenden Schreibschenkel 5 auf. Diese Schenkel sind in bekannter Weise durch einen Kopf 6 gelenkig verbunden, und ihre Spreizung kann über eine Schraubspindel 7 fein eingestellt werden. Die Schenkel 2 bzw. 5 sind an den Stellen 8 bzw. 9 abwinkelbar.The compass shown in FIG. 1 has a first leg 2 carrying the compass tip 1 and a writing leg 5 carrying the writing tip 3 of a tube recorder 4. These legs are articulated in a known manner by a head 6, and their spread can be finely adjusted via a screw 7. The legs 2 and 5 can be bent at points 8 and 9.

Der Röhrchenschreiber 4 ist in die Öffnung 10 eines Aufnahmeteiles 11 eingeschraubt, welches Fig.2 im Einzelnen zeigt. Das Teil 11 ist erfindungsgemäß auf einem Ansatzteil 12 längs verschieblich gelagert. Das zylindrische Ansatzteil 12 ist über eine bekannte Kupplung 13 in den Schreibschenkel 5 eingesetzt. Der Verschiebungsweg des Teiles 11 auf dem Ansatzteil 12 ist nach oben durch einen Absatz 14 des Ansatzteiles 12 begrenzt und nach unten durch einen mittels einer Rändelschraube 15 befestigten Führungsteil 16. Der Führungsteil ist gegenüber dem Ansatzteil 12 in an sich bekannter Weise gegen Verdrehung gesichert, z. B. durch rechteckförmige Ausbildung der Einsatzöffnung für den Zapfen 17, der seinerseits einen dazu passenden Querschnitt aufweist.The tube recorder 4 is screwed into the opening 10 of a receiving part 11, which is shown in detail in FIG. The part 11 is, according to the invention, slidably mounted on a shoulder part 12. The cylindrical extension part 12 is inserted into the writing leg 5 via a known coupling 13. The displacement path of part 11 on extension 12 is limited at the top by a shoulder 14 of extension 12 and down by a guide part 16 fastened by means of a knurled screw 15 . B. by rectangular design of the insertion opening for the pin 17, which in turn has a matching cross section.

Der Führungsteil 16 sichert das Teil 11 gegen Verdrehung auf dem Ansatzteil 12, indem er von unten in dessen Führungsöffnung 18 eingreift (siehe Fig.2). Das Teil 11 ist durch einen Steckzapfen 19 gegen Längsverschiebung auf dem Ansatzteil 12 arretierbar. Fig. 2 zeigt einen Teilschnitt durch das Teil 11 in Höhe des Steckzapfens 19. Dieser Steckzapfen 19 weist eine angefräste Keilfläche 20 auf, so daß durch Druck auf das Ende 21 das in die Öffnung 22 des Teiles 11 eingepaßte Ansatzteil 12 festgeklemmt und bei Druck auf den Kopf 23 am andern Ende des Zapfens 19 wieder gelöst wird. Es ist klar, daß der in der Öffnung 18 gleitende Führungsteil 16 auch durch einen in der Öffnung 18 festen Stift ersetzt werden kann, der dann in einer durch die Schraube 15 am Ansatzteil 12 drehsicher befestigten Führung gleitet.The guide part 16 secures the part 11 against rotation on the extension part 12 by engaging its guide opening 18 from below (see FIG. 2). The part 11 can be locked against longitudinal displacement on the extension part 12 by a plug pin 19. Fig. 2 shows a partial section through the part 11 at the height of the spigot 19. This spigot 19 has a milled wedge surface 20 so that the end part 12 fitted into the opening 22 of the part 11 is clamped by pressure on the end 21 and under pressure the head 23 is released again at the other end of the pin 19. It is clear that the guide part 16 sliding in the opening 18 can also be replaced by a pin fixed in the opening 18, which then slides in a guide secured by the screw 15 on the attachment part 12.

Zum Zeichnen kleiner Kreise wird nun das Teil 11 so verschoben, daß sich die Schreibspitze 3 des Röhrchenschreibers 4 oberhalb der Zirkelspitze 1 befindet und beim Aufsuchen des Kreismittelpunktes auf der Schreibunterlage dieselbe nicht berühren kann. In dieser Stellung wird das Teil 11 mittels des Steckzapfens 19 festgeklemmt. Nach dem Einstellen des Kreisradius mit der Schraubspindel 7 und Einstechen der Zirkelspitze 1 in den Kreismittelpunkt wird der Zapfen 19 gelöst und die Schreibspitze 3 auf die Schreibunterlage abgesenkt, auf der sie infolge der Schwere von Röhrchenschreiber 4 und Teil 11 mit passendem Auflagedruck verbleibt, unabhängig von unvermeidlichen kleinen Zirkelschwankungen um die zur Schreibunterlage senkrechte Lage.To draw small circles, the part 11 is now shifted so that the writing tip 3 of the tube recorder 4 is located above the circular tip 1 and cannot touch the same when the center of the circle is located on the writing pad. In this position, the part 11 is clamped by means of the plug pin 19. After setting the radius of the circle with the screw spindle 7 and inserting the compass tip 1 into the center of the circle, the pin 19 is loosened and the writing tip 3 is lowered onto the writing pad, on which it remains due to the weight of tube recorder 4 and part 11 with the appropriate contact pressure, regardless of inevitable small circle fluctuations around the position perpendicular to the desk pad.

Bei der in Fig. 3 dargestellten erfindungsqemäßen Variante weist das Ansatzteil 12 selbst bereits eine solide winkelmäßige Formgebung auf, während das den Röhrchenschreiber 4 aufnehmende Teil 11 als zylindrische Fassung mit Griffansatz 24 ausgebildet ist. Diese Fassung ist im Ansatzstück 12 mittels eines Steilgewindes 25 selbsthemmungsfrei und derart geführt, daß sie durch ihr Gewicht unter Drehung um die Achse 26 selbsttätig auf die Schreibunterlage absenkbar ist und dort mit konstantem Auflagedruck verbleibt. Zum Anheben des Röhrchenschreibers dreht man einfach am Griffansatz 24 und klemmt das Teil 11 mittels einer Klemmschraube 19' im Ansatzstück 12 fest. Der besondere Vorteil dieser Variante gegenüber der zu Fig. 2 beschriebenen liegt darin, daß eine Drehung verhindernde Führungsmittel 16 sowie eine verkantungs- und spielanfälligere Gradführung vermieden sind.In the variant according to the invention shown in FIG. 3, the attachment part 12 itself already has a solid angular shape, while the part 11 receiving the tube recorder 4 is designed as a cylindrical socket with a handle attachment 24. This socket is self-locking in the extension 12 by means of a steep thread 25 and is guided in such a way that its weight can be lowered automatically onto the writing pad by rotating it about the axis 26 and remains there with constant contact pressure. To lift the tube recorder, simply turn the handle attachment 24 and clamp the part 11 in the attachment piece 12 by means of a clamping screw 19 '. The particular advantage of this variant compared to that described in relation to FIG. 2 is that a rotation-preventing guide means 16 and a tilting and play-prone degree guidance are avoided.

Fig. 4 zeigt eine Ausführungsform des Ansatzes, die der in Fig. 1 dargestellten ähnlich ist, aber eine andere Klemmung aufweist. Der Röhrchenschreiber 4 ist wiederum in die Öffnung 10 des Teiles 11 eingeschraubt. Das Teil 11 ist auf dem Ansatzteil 12 mittels einer Bohrung 28 längs verschieblich gelagert. Der Verschiebungsweg des Teiles 11 auf dem Ansatzteil 12 ist nach oben durch einen Federring 14 begrenzt und nach unten durch ein drehstarr befestigtes Führungsteil 16. Dieses Führungsteil gleitet mit einem gabelförmigen Ende längs einem Führungszapfen 16', der im Teil 11 fest und in die Führungsgabel eingepaßt ist.Fig. 4 shows an embodiment of the approach, which is similar to that shown in Fig. 1, but has a different clamping. The tube recorder 4 is in turn screwed into the opening 10 of the part 11. The part 11 is mounted on the extension part 12 by means of a bore 28 so as to be longitudinally displaceable. The displacement of the part 11 on the extension part 12 is limited at the top by a spring ring 14 and at the bottom by a torsionally rigid guide part 16. This guide part slides with a fork-shaped end along a guide pin 16 ', which is fixed in part 11 and fitted into the guide fork is.

Das Teil 11 weist einen zur Bohrung 28 leicht exzentrischen, kreiszylindrischen. Fortsatz 11' von solcher Länge auf, daß er einen darauf passenden und drehbaren Überwurf 19" gerade ausfüllt. Der Überwurf 19" weist ebenfalls eine exzentrische Bohrung 27 zum Hindurchstecken des Ansatzstückes 12 auf, die für eine Winkelstellung mit der Bohrung 28 fluchtet. Er trägt ferner einen zungenförmigen Fortsatz 30 seines Randes, der das Teil 11 übergreift und dadurch gegen ein Herausgleiten aus dem Überwurf 19" sichert.The part 11 has a circular cylindrical, slightly eccentric to the bore 28. Extension 11 'of such a length that it just fills a rotatable cap 19 "which fits thereon. The cap 19" also has an eccentric bore 27 for pushing through the extension 12, which is aligned with the bore 28 for an angular position. He also carries a tongue-shaped extension 30 of its edge, which engages over the part 11 and thereby prevents it from sliding out of the cap 19 ".

Fig.4a zeigt eine Ansicht des Überwurfes 19" in Richtung des Pfeiles 31. Wie ersichtlich-ist auf der der Bohrung 27 benachbarten Innenkante ein Vorsprung 32 vorgesehen, der nach dem Einführen des Fortsatzes 11' in eine Ringnut 33 an dessen Oberkante eingreift und dadurch die Drehung des Überwurfes 19" auf den halbkreisförmigen Bereich der Ringnut 33 beschränkt. Bei einer derartigen Drehung verschiebt sich die Bohrung 27 wegen ihrer exzentrischen Lage gegenüber der Bohrung 28 im Fortsatz 11' des Teiles 11 und verursacht so eine Klemmung des Teiles 11 gegenüber dem Ansatzteil 12. Diese Klemmung ist nur aufgehoben, wenn die Bohrungen 27 und 28 in der oben erwähnten Weise aufgrund der Winkelstellung des Überwurfes 19" miteinander fluchten.4 a shows a view of the union 19 "in the direction of arrow 31. As can be seen, a projection 32 is provided on the inner edge adjacent to the bore 27, which engages in an annular groove 33 on the upper edge thereof after insertion of the extension 11 'and thereby the rotation of the union 19 "is limited to the semicircular area of the annular groove 33. With such a rotation, the bore 27 moves because of its eccentric position relative to the bore 28 in the extension 11 'of the part 11 and thus causes the part 11 to be clamped against the extension part 12. This clamping is only released when the bores 27 and 28 in in the above-mentioned manner due to the angular position of the union 19 ".

Zum Zeichnen größerer Kreise wird man die Schreibspitze in der üblichen Lage klemmen, damit sich beim Ziehen in an sich bekannter Weise der Radius nicht verändern kann.To draw larger circles, the writing tip will be clamped in the usual position so that the radius cannot change when you draw in a manner known per se.

Claims (5)

1. Joining element for joining a writing or drawing device, particularly a tube pen (4), to the leg of a drawing compass, with a stud (12) fitting to the drawing leg (5) and a receptacle (11) to receive the writing or drawing device, thereby characterized that the receptacle (11) is lengthwise shiftably carried by the stud (12), that guiding means (16) are provided to prevent a rotation between receptacle (11) and stud (12) and that means (19) are provided for locking the shiftable receptacle (11) to the stud (12).
2. Joining element for joining a writing or drawing device, particularly a tube pen (4), to the leg of a drawing compass, with a stud (12) fitting to the drawing leg (5) and a receptacle (11) to receive the writing or drawing device, thereby characterized that the receptacle (11) is a cylindrical holder guided by a thread of coarse pitch within the stud (12) without selflocking such, that the receptacle (11) may be automatically lowered to the drawing board due to its weight or by a spring, and that means (19') are provided for locking the shiftable receptacle (11) to the stud (12).
3. Joining element according to claim 1, thereby characterized that the means for locking the shiftable receptacle (11) to the stud (12) consist of a cylindric extension (11') of the receptacle (11) encompassing the stud (12) and a cap (19") fitting to the extension (11') and rotatable thereon, the cap (19") having a bore (27) excentric to its axis and the stud (12) fitting into the bore (27).
4. Joining element according to claim 1 or 3, characterized by a range of displacement of the receptacle (11) such, that at minimum spread of the drawing compass the drawing point (3) of the writing or drawing device may be lifted above as well as lowered below the compass point (1
5. Joining element according to claim 4, thereby characterized that the drawing point (3) of the writing or drawing device is maintained on the drawing board by the weight of device and shiftable receptacle (11) or by a spring, when the compass is held in its working position.
EP19800810119 1979-05-28 1980-04-08 Supporting element to be fixed on the extremity of a drawing compass's leg Expired EP0020291B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CH4938/79 1979-05-28
CH493879A CH645576A5 (en) 1979-05-28 1979-05-28 APPROACH FOR CIRCULAR.

Publications (2)

Publication Number Publication Date
EP0020291A1 EP0020291A1 (en) 1980-12-10
EP0020291B1 true EP0020291B1 (en) 1983-03-23

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Family Applications (1)

Application Number Title Priority Date Filing Date
EP19800810119 Expired EP0020291B1 (en) 1979-05-28 1980-04-08 Supporting element to be fixed on the extremity of a drawing compass's leg

Country Status (3)

Country Link
EP (1) EP0020291B1 (en)
CH (1) CH645576A5 (en)
DE (1) DE3062406D1 (en)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN107933158B (en) * 2017-11-16 2020-04-28 周默 Compasses convenient to use
CN107856446B (en) * 2017-11-16 2020-02-14 周默 Improved compasses

Family Cites Families (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE86533C (en) *
GB101683A (en) * 1916-06-27 1916-10-12 John William Setten Improved Pencil Grip for Drawing Compass.
GB429394A (en) * 1934-03-09 1935-05-29 Thomas Bethel Holland Improvements in and relating to lead or like holders for drawing instruments
US2442185A (en) * 1944-05-11 1948-05-25 Szerenyi Andrew Compass for use in drafting
US2557500A (en) * 1948-06-19 1951-06-19 Carl L Fairbanks Drawing compass
US2677181A (en) * 1951-07-05 1954-05-04 Elwood E Stephens Pipe marking device
DE1561393B1 (en) * 1967-04-21 1969-11-20 Czerweny Otto Arland Von Dr MACHINE FOR MANUFACTURING BOX CASES
DE1949803A1 (en) * 1969-10-02 1971-04-15 Messerschmitt Boelkow Blohm Pole circle

Also Published As

Publication number Publication date
DE3062406D1 (en) 1983-04-28
EP0020291A1 (en) 1980-12-10
CH645576A5 (en) 1984-10-15

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