EP0395971B1 - Bow compass - Google Patents
Bow compass Download PDFInfo
- Publication number
- EP0395971B1 EP0395971B1 EP90107604A EP90107604A EP0395971B1 EP 0395971 B1 EP0395971 B1 EP 0395971B1 EP 90107604 A EP90107604 A EP 90107604A EP 90107604 A EP90107604 A EP 90107604A EP 0395971 B1 EP0395971 B1 EP 0395971B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- compass
- legs
- spring bow
- spring clip
- spring
- 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 - Lifetime
Links
Images
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
- B43L9/16—Features common to compasses, dividers, and callipers
- B43L9/20—Pivots
-
- 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
Definitions
- the invention relates to a spring bracket with a spring bracket with its free ends in engagement with the rear ends of the compass legs and with an extending through the compass adjuster, the rear ends of the compass are in supportive engagement with each other.
- the spring clip In a known spring clip of this type (US-A 4,120,092), the spring clip consists of an arc-shaped strip of constant material thickness, the free ends of which extend in recesses on the outer sides of the rear ends of the compass legs and thus exert a spring force on them in order to form the compass legs Interacting with the adjusting device having a threaded spindle, a handle and a spindle provided with shoulders in a defined position, the compass legs with their the rear ends are supported on a roller arranged in a recess of the compass legs and are held together by the spring clip.
- a spring clip compass is known from US Pat. No. 2,296,279, in which the cross section of the spring clip increases continuously away from the free ends as shown in FIG. 7.
- the spring brackets used in the known spring bracket circles represent a weak point of the entire circuit structure in that they have no secure connection to the compass legs.
- a spring clip of the type mentioned at the outset is designed in such a way that projections are provided at the free ends of the spring clip which extend substantially transversely to the plane containing the longitudinal axes of the two circle legs and which engage in the region of the rear ends of the circle legs trained, circular arc-shaped guide slots.
- a peg-shaped grip element can be integrally formed on the outside of the spring clip so that the spring clip and grip element can be produced in one piece in one operation, while previously several working steps were required to manufacture the spring clip and peg-shaped handle element and to form a threaded hole in the spring clip into which the handle element can be screwed.
- each of the toothed segments of the spring clip according to the invention can consist of plastic, and in order to achieve a particularly uniform and precise guidance, each of the toothed segments can consist of two adjacent sections, the toothings of which are offset from one another in the direction of rolling.
- toothed segments are made of plastic in a spring clip assembly according to the invention, it is expedient to also form the guide slots in these toothed segments for the engagement of projections provided on the spring clip.
- the spring clip compass shown has compass legs 1, 2, at the front ends of which clamping screws 3, 4 are fastened in the usual manner, with the aid of which a needle tip 6 or a lead lead 5 can be fastened in the front end of the respective compass leg.
- a guide device which, in the usual way, has a threaded pin 11 with threads of different direction and can be rotated with the aid of a knurled wheel 12 which is fixed non-rotatably on it, so that the thread of the Setscrew 11 with nuts, not shown, held by rivets 9 and 10 in the compass legs 1 and 2 can cause an adjustment of the opening angle of the compass legs 1, 2.
- toothed segments 7, 8 are fastened, which are in supportive engagement with one another and which have a shift towards the free rear end of the associated compass leg (Fig 2).
- each of the tooth segments consists of two adjacent sections 8 'and 8'', which are offset from each other in the rolling direction, so that where one section carries a tooth, the other section has a tooth gap having. As is known, this results in a uniform and precise guidance of the tooth segments during the rolling.
- the spring clip 13 With the rear ends of the compass legs 1 and 2 is a spring clip 13 in engagement, which compresses the compass legs 1, 2, as is usual with spring clip compasses, in the rear end region and thus holds them in position.
- the spring clip 13 is made of plastic, for example of fiber-reinforced polyamide, both glass fibers and carbon fibers being suitable as fibers.
- the material thickness of the spring clip 13, as can be seen in FIG. 1 increases continuously and uniformly from the free ends to the rear central region, on which a peg-shaped grip element 14 is formed on the outside.
- the desired spring behavior is achieved by this increase in material thickness. It should be noted that it is also possible to achieve this spring behavior by continuously increasing the width of the spring clip alone or by a combination of the increases in the width and thickness of the spring clip.
- the free ends of the spring clip 13 engage in recesses on the outer sides of the compass legs, so that the spring clip 13 is held in position there.
- the free ends of the spring clip 13 are approximately C-shaped in section, and the legs of this C adjoining the base extend along the side faces of the compass legs.
- the inward projections 16 formed on the free ends of the legs are brought into engagement with circular guide slots 15 (FIG. 2) by elastic bending of the spring clip ends.
Landscapes
- Clamps And Clips (AREA)
- Springs (AREA)
Description
Die Erfindung bezieht sich auf einen Federbügelzirkel mit einem mit seine Freien Enden in Eingriff mit den hinteren Enden der Zirkelschenkel stehenden Federbügel und mit einer sich durch die Zirkelschenkel erstreckenden Einstellvorrichtung, wobei die hinteren Enden der Zirkelschenkel in abstützendem Eingriff miteinander stehen.The invention relates to a spring bracket with a spring bracket with its free ends in engagement with the rear ends of the compass legs and with an extending through the compass adjuster, the rear ends of the compass are in supportive engagement with each other.
Bei einem bekannten Federbügelzirkel dieser Art (US-A 4,120,092) besteht der Federbügel aus einem kreisbogenförmig ausgebildeten Streifen konstanter Materialstärke, dessen freie Enden sich in Aussparungen an den Außenseiten der hinteren Enden der Zirkelschenkel erstrecken und somit auf diese eine Federkraft ausüben, um die Zirkelschenkel in Zumammenwirken mit der eine Gewindespindel, eine Handhabe und eine mit Absätzen versehene Spindel aufweisenden Einstellvorrichtung in einer definierten Lage zu halten, wobei die Zirkelschenkel mit ihren hinteren Enden sich auf einer in einer Aussparung der Zirkelschenkel angeordneten Walze abstützen und durch den Federbügel zusammengehalten werden.In a known spring clip of this type (US-A 4,120,092), the spring clip consists of an arc-shaped strip of constant material thickness, the free ends of which extend in recesses on the outer sides of the rear ends of the compass legs and thus exert a spring force on them in order to form the compass legs Interacting with the adjusting device having a threaded spindle, a handle and a spindle provided with shoulders in a defined position, the compass legs with their the rear ends are supported on a roller arranged in a recess of the compass legs and are held together by the spring clip.
Aus der US-A 2,296,279 ist ein Federbügelzirkel bekannt, bei dem der Querschnitt des Federbügels gemäß der Darstellung in Fig. 7 von den freien Enden weg kontinuierlich zunimmt.A spring clip compass is known from US Pat. No. 2,296,279, in which the cross section of the spring clip increases continuously away from the free ends as shown in FIG. 7.
Die bei den bekannten Federbügelzirkeln verwendeten Federbügel stellen insofern einen Schwachpunkt des gesamten Zirkelaufbaus dar, als sie keine sichere Verbindung zu den Zirkelschenkeln aufweisen.The spring brackets used in the known spring bracket circles represent a weak point of the entire circuit structure in that they have no secure connection to the compass legs.
Es ist Aufgabe der Erfindung, einen Federbügelzirkel dahingehend zu verbessern, daß der Federbügel bei Aufspreitzen der Zirkelschenkel bis in ihre maximal gespreitzte Lage sich nicht aus seiner Halterung lösen und abfallen kann, wenn die Federwirkung des Federbügels nachgelassen hat, d.h. der Federbügel durch Alterung u.ä. einen Teil seiner Elastizität verloren hat.It is an object of the invention to improve a spring bracket compass in such a way that when the compass legs are spread apart into their maximally spread position, the spring bracket cannot detach from its holder and fall off when the spring action of the spring bracket has decreased, i.e. the spring clip due to aging, etc. has lost part of its elasticity.
Zur Lösung dieser Aufgabe wird ein Federbügelzirkel der eingangs erwähnten Art erfindungsgemäß derart ausgestaltet, daß an den freien Enden des Federbügels sich im wesentlichen quer zur die Längsachsen der beiden Zirkelschenkel enthaltenden Ebene erstreckende Vorsprünge vorgesehen sind, die in Eingriff mit im Bereich der hinteren Enden der Zirkelschenkel ausgebildeten, kreisbogenförmigen Führschlitzen stehen.To achieve this object, a spring clip of the type mentioned at the outset is designed in such a way that projections are provided at the free ends of the spring clip which extend substantially transversely to the plane containing the longitudinal axes of the two circle legs and which engage in the region of the rear ends of the circle legs trained, circular arc-shaped guide slots.
Diese am Federbügel vorgesehenen Vorsprünge, die beispielsweise einstückig mit dem Federbügel ausgebildet sein können, stehen also immer in Eingriff mit den Führschlitzen, so daß sie auch dann, wenn die Zirkelschenkel in ihre maximal aufgespreizte Lage bewegt sind und infolge Elastizitätsverlustes des Federbügels an sich die Gefahr besteht, daß sich dieser von den Zirkelschenkeln löst, den Federbügel in seiner vorgegebenen Lage halten.These projections provided on the spring clip, which can be formed, for example, in one piece with the spring clip, are always in engagement with the guide slots, so that even when the compass legs are moved into their maximally spread position and as a result of loss of elasticity of the spring clip, the danger per se there is that this detaches from the compass legs, hold the spring clip in its predetermined position.
Bei der Herstellung des erfindungsgemäßen Federbügels kann an diesem mittig zwischen seinen freien Enden an seiner Außenseite ein zapfenförmiges Griffelement angeformt sein, so daß sich Federbügel und Griffelement in einem Arbeitsgang einstückig herstellen lassen, während bisher mehrere Arbeitsschritte erforderlich waren, um Federbügel und zapfenförmiges Griffelement herzustellen sowie eine Gewindebohrung im Federbügel auszubilden, in die das Griffelement eingeschraubt werden kann.In the manufacture of the spring clip according to the invention, a peg-shaped grip element can be integrally formed on the outside of the spring clip so that the spring clip and grip element can be produced in one piece in one operation, while previously several working steps were required to manufacture the spring clip and peg-shaped handle element and to form a threaded hole in the spring clip into which the handle element can be screwed.
Um eine zuverlässige und genaue Führung und Abstützung der von der Kraft des Federbügels beaufschlagten Zirkelschenkel zu erreichen, können ihre hinteren Enden über an ihnen vorgesehene Zahnsegmente in abstützendem Eingriff stehen.In order to achieve reliable and precise guidance and support of the compass legs acted upon by the force of the spring clip, their rear ends can be in supportive engagement via toothed segments provided on them.
Ein derartiger Eingriff der Schenkel eines Zirkels über Zahnsegmente ist zwar von Einsatzzirkeln her bekannt, jedoch wurde bei Federbügelzirkeln bisher eine derartige Art der Abstützung nicht vorgesehen.Such an engagement of the legs of a circle via toothed segments is known from insert circles, but such a type of support has not previously been provided in spring clip circles.
Die Zahnsegmente des erfindungsgemäßen Federbügelzirkels können aus Kunststoff bestehen, und um eine besonders gleichmäßige und genaue Führung zu erreichen, kann jedes der Zahnsegmente aus zwei nebeneinander liegenden Abschnitten bestehen, deren Zahnungen in Abwälzrichtung gegeneinander versetzt sind.The toothed segments of the spring clip according to the invention can consist of plastic, and in order to achieve a particularly uniform and precise guidance, each of the toothed segments can consist of two adjacent sections, the toothings of which are offset from one another in the direction of rolling.
Wenn bei einem erfindungsgemäßen Federbügelzirkel die Zahnsegmente aus Kunststoff hergestellt sind, ist es zweckmäßig, in diesen Zahnsegmenten auch die Führschlitze zum Eingriff von am Federbügel vorgesehenen Vorsprüngen auszubilden.If the toothed segments are made of plastic in a spring clip assembly according to the invention, it is expedient to also form the guide slots in these toothed segments for the engagement of projections provided on the spring clip.
Die Erfindung wird im folgenden anhand der ein Ausführungsbeispiel zeigenden Figuren näher erläutert.
- Figur 1
- zeigt in einer Ansicht einen Federbügelzirkel.
Figur 2- zeigt in perspektivischer Darstellung das obere Ende eines Zirkelschenkels mit einem Zahnsegment.
Figur 3- zeigt einen Schnitt entlang der Linie III-III aus Figur 1.
- Figure 1
- shows in a view a spring clip.
- Figure 2
- shows a perspective view of the upper end of a compass leg with a tooth segment.
- Figure 3
- shows a section along the line III-III of Figure 1.
Der dargestellte Federbügelzirkel hat Zirkelschenkel 1, 2, an deren vorderen Enden in üblicher Weise Klemmschrauben 3, 4 befestigt sind, mit deren Hilfe eine Nadelspitze 6 bzw. eine Bleimine 5 im vorderen Ende des jeweiligen Zirkelschenkels befestigt werden kann.The spring clip compass shown has
Im Bereich zwischen den Enden der Zirkelschenkel 1, 2 ist eine Führeinrichtung vorhanden, die in üblicher Weise einen Gewindestift 11 mit Gewinden unterschiedlicher Gangrichtung aufweist und mit Hilfe eines unverdrehbar auf ihm befestigten Rändelrades 12 verdreht werden kann, so daß sich infolge des Eingriffs der Gewinde des Gewindestiftes 11 mit nicht dargestellten, mittels Nieten 9 und 10 in den Zirkelschenkeln 1 und 2 gehaltener Muttern eine Verstellung des Öffnungswinkels der Zirkelschenkel 1, 2 bewirken läßt.In the area between the ends of the
An den hinteren Enden der Zirkelschenkel 1, 2 sind aus Kunststoff, beispielsweise aus faserverstärktem Polyamid hergestellte Zahnsegmente 7, 8 befestigt, die in abstützendem Eingriff miteinander stehen und die einer eine Verlagerung in Richtung auf das freie hintere Ende des zugehörigen Zirkelschenkels verhindernden Absatz aufweisen (Figur 2).To the rear ends of the
Wie Figur 2 für das Zahnsegment 8 zeigt, besteht jedes der Zahnsegemente aus zwei nebeneinander liegenden Abschnitten 8' und 8'', die in Abwälzrichtung gegeneinander versetzt sind, so daß sich dort, wo der eine Abschnitt einen Zahn trägt, der andere Abschnitt eine Zahnlücke aufweist. Dadurch ergibt sich, wie im übrigen bekannt, eine gleichmäßige und genaue Führung der Zahnsegmente beim Abwälzen.As Figure 2 shows for the
Mit den hinteren Enden der Zirkelschenkel 1 und 2 steht ein Federbügel 13 in Eingriff, der die Zirkelschenkel 1, 2, wie bei Federbügelzirkeln üblich, im hinteren Endbereich zusammendrückt und so positioniert hält. Der Federbügel 13 ist aus Kunststoff hergestellt, beispielsweise aus faserverstärktem Polyamid, wobei als Fasern sowohl Glasfasern als auch Kohlenstoffasern geeignet sind. Um die gewünschte Federwirkung zu erreichen, nimmt die Materialdicke des Federbügels 13, wie in Figur 1 zu erkennen, von den freien Enden kontinuierlich und gleichmäßig bis zum hinteren Mittelbereich zu, an dem an der Außenseite ein zapfenförmiges Griffelement 14 angeformt ist. Durch diese Zunahme der Materialdicke wird das gewünschte Federverhalten erreicht. Es sei darauf hingewiesen, daß es auch möglich ist, dieses Federverhalten durch eine kontinuierliche Zunahme allein der Breite des Federbügels oder aber durch eine Kombination der Zunahmen von Breite und Dicke des Federbügels zu erreichen.With the rear ends of the
Wie insbesondere in den Figuren 2 und 3 zu erkennen ist, greifen die freien Enden des Federbügels 13 in Aussparungen an den Außenseiten der Zirkelschenkel, so daß der Federbügel 13 dort in seiner Lage gehalten wird. Zusätzlich sind die freien Enden des Federbügels 13, wie Figur 3 zeigt, im Schnitt in etwa C-förmig ausgebildet, und die an die Basis anschließenden Schenkel dieses C erstrecken sich entlang der Seitenflächen der Zirkelschenkel. Die an den freien Enden der Schenkel ausgebildeten, nach innen gerichteten Vorsprünge 16 werden durch elastisches Aufbiegen der Federbügelenden in Eingriff mit kreisförmigen Führschlitzen 15 (Figur 2) gebracht. Auf diese Weise ist ein sicherer Eingriff zwischen Federbügel 13 und Zirkelschenkeln 1, 2 hergestellt, durch die die Verschwenkung der Zirkelschenkel 1, 2 nicht beeinträchtigt wird, weil die Vorsprünge 16 in den Führschlitzen 15 gleiten, durch den jedoch erreicht wird, daß der Federbügel 13 sich nicht ohne besondere Maßnahmen von den Zirkelschenkeln 1, 2 lösen kann.As can be seen in particular in Figures 2 and 3, the free ends of the
Claims (6)
- A spring bow compass having a spring bow (13) which is engaged by its free ends with the rear ends of the legs (1, 2) of the compass and having an adjustment device (11, 12) which extends through the legs (1, 2) of the compass, wherein the rear ends of the legs (1, 2) of the compass are in supporting engagement with one another, the spring bow being made of plastic and the material cross-section thereof increasing continuously and by the same amount each time from both free ends, characterised in that projections (16) extending substantially transversely to the plane containing longitudinal axes of the two legs (1, 2) of the compass are provided on the free ends of the spring bow (13), which projections are engaged with arcuate guide slots (15) formed in the region of the rear ends of the legs (1, 2) of the compass.
- A spring bow compass according to Claim 1,
characterised in that a cone-shaped gripping element (14) is formed centrally between the free ends of the spring bow (13) on the outside thereof. - A spring bow compass according to Claim 1 or 2,
characterised in that the rear ends of the legs (1, 2) of the compass are in supporting engagement by means of toothed segments (7, 8) provided thereon. - A spring bow compass according to Claim 3,
characterised in that the toothed segments (7, 8) are made of plastic. - A spring bow compass according to Claim 2 or 3,
characterised in that each of the toothed segments (e.g. 8) consists of two adjacent sections (8', 8''), the teeth of which are offset relative to one another in the direction of rolling. - A spring bow compass according to Claim 1 and one of Claims 3 to 5, characterised in that the guide slots (15) are formed in the toothed segments (7, 8).
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE8905644U | 1989-05-05 | ||
DE8905644U DE8905644U1 (en) | 1989-05-05 | 1989-05-05 | Spring clip compass |
Publications (2)
Publication Number | Publication Date |
---|---|
EP0395971A1 EP0395971A1 (en) | 1990-11-07 |
EP0395971B1 true EP0395971B1 (en) | 1993-08-11 |
Family
ID=6838962
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP90107604A Expired - Lifetime EP0395971B1 (en) | 1989-05-05 | 1990-04-21 | Bow compass |
Country Status (2)
Country | Link |
---|---|
EP (1) | EP0395971B1 (en) |
DE (2) | DE8905644U1 (en) |
Families Citing this family (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE4014927A1 (en) * | 1990-05-10 | 1991-11-28 | Intertech Zeichengeraete Guent | Leg of pair of compasses - has toothed segment at upper end with recesses which are close fit over end of leg |
DE9101209U1 (en) * | 1991-02-02 | 1991-04-25 | M. Seelig KG Reißzeugfabrik, 8535 Emskirchen | Spring clip compass |
DE4205072A1 (en) * | 1991-02-23 | 1992-08-27 | Emskirchen Reisszeugfabrik | Spring-bow drawing compasses - with legs covered with non-metallic material such as beech-wood |
Family Cites Families (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2296279A (en) * | 1941-06-17 | 1942-09-22 | Miles H Hamilton | Beam compass |
CH524479A (en) * | 1971-09-22 | 1972-06-30 | Kern & Co Ag | Straight guidance on a compass |
CA1068897A (en) * | 1976-11-19 | 1980-01-01 | Raymond A. Payton | Drawing instrument |
US4120092A (en) * | 1977-04-11 | 1978-10-17 | Hanson Goodwin F | Plastic injection molded bow compass |
DE3838473C1 (en) * | 1988-03-15 | 1989-06-01 | Intertech Zeichengeraete Guenther Partes Kg, 8535 Emskirchen, De | Fine adjustment compass |
DE3808511C1 (en) * | 1988-03-15 | 1989-05-11 | Intertech Zeichengeraete Guenther Partes Kg, 8535 Emskirchen, De | Fine-adjustment compass |
-
1989
- 1989-05-05 DE DE8905644U patent/DE8905644U1/en not_active Expired - Lifetime
-
1990
- 1990-04-21 EP EP90107604A patent/EP0395971B1/en not_active Expired - Lifetime
- 1990-04-21 DE DE9090107604T patent/DE59002255D1/en not_active Expired - Fee Related
Also Published As
Publication number | Publication date |
---|---|
DE8905644U1 (en) | 1990-09-06 |
DE59002255D1 (en) | 1993-09-16 |
EP0395971A1 (en) | 1990-11-07 |
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