EP0046830B1 - Präzisionszirkel mit gelenkigem Schenkel und steifer Stange - Google Patents

Präzisionszirkel mit gelenkigem Schenkel und steifer Stange Download PDF

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Publication number
EP0046830B1
EP0046830B1 EP80401223A EP80401223A EP0046830B1 EP 0046830 B1 EP0046830 B1 EP 0046830B1 EP 80401223 A EP80401223 A EP 80401223A EP 80401223 A EP80401223 A EP 80401223A EP 0046830 B1 EP0046830 B1 EP 0046830B1
Authority
EP
European Patent Office
Prior art keywords
bar
attachment
legs
attachments
precision
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
EP80401223A
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English (en)
French (fr)
Other versions
EP0046830A1 (de
Inventor
Jean Bras
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.)
Bras Jean
Original Assignee
Individual
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 Individual filed Critical Individual
Priority to EP80401223A priority Critical patent/EP0046830B1/de
Priority to DE8080401223T priority patent/DE3071252D1/de
Priority to AT80401223T priority patent/ATE16574T1/de
Publication of EP0046830A1 publication Critical patent/EP0046830A1/de
Application granted granted Critical
Publication of EP0046830B1 publication Critical patent/EP0046830B1/de
Expired 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
    • B43L9/16—Features common to compasses, dividers, and callipers
    • 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
    • B43L9/025—Compasses with parallel legs

Definitions

  • the present invention relates to a precision compass with parallel breaks and a stiffness bar.
  • Precision compasses are known which have stiffness bars joining the two branches and located closer to the head than broken pieces.
  • This bar cooperates with mechanisms for adjusting the tracing radius and for blocking the branches.
  • Compasses with double branches are also known which are assembled in a deformable parallelogram ensuring the parallelism of the breaks. To obtain a fast and precise route using these devices, great skill is required due to the distance from the means for adjusting the broken lines.
  • Compasses are also known comprising two parallel breaks each articulated to a branch and joined by a stiffness bar capable of sliding in at least one of the breaks and of being blocked in both (CH n ° 379777 PIAB).
  • the stiffness bar is located below the points of articulation of broken branches and therefore is subject to compression bending stress accentuating the risks of buckling.
  • the object of the present invention is to eliminate the above-mentioned drawbacks by implementing a compass of increased precision and of easy use.
  • Another object of the present invention is the implementation of a compass having good angular and transverse rigidity and not subject to the phenomena of bracing of the stiffness bar.
  • the compass according to the invention of the type comprising two branches, each of which receiving at its lower end an articulated break, said breaks being automatically parallel by means of a stiffness bar which connects them and is slidably mounted in a guide bearing and one of the breaks is characterized in that each of the branches is provided with an elastic yoke in which the corresponding break is articulated, that the break and the guide bearing of the bar are provided with a longitudinal slot at the orifice for passage of the bar, that the means of articulation and of fixing the breakage crosses said slots and that by blocking of these is carried out both the blocking in translation of the bar and the blocking of the 'articulation of the broken parts with respect to the corresponding branch.
  • the stiffness rod cooperating with the breaks is placed between their axis of articulation and the head of the compass to eliminate the tendency to buckling of the bar by substitution of a bending tensile stress for a compression bending stress.
  • the precision compass comprises a head 1 in which two branches 2 are articulated, each provided at the lower end with a point of articulation of a tracer carrier 3 or tip holder 4 joined together. one to the other by a stiffness bar 5.
  • the head 1 is constituted by a yoke in which are mounted the two branches 2 cooperating with each other by means of at least two toothed sectors 6 meshing with one another.
  • the solid branches 2 are provided at the end with a groove 7 in which the non-toothed part of the sector is housed.
  • This groove oriented in the plane of the compass as well as the toothed sector are provided with a transverse orifice receiving a means of articulation of said branch to the head 1.
  • this means consists of a cylindrical axis 8 terminated at each of its ends by a spherical cap partially engaged in orifices made in the yoke.
  • the articulation means consists of two balls 9 each mounted in the branch on either side of the groove and each engaging partially in the orifice of the sector and in the orifice of the screed.
  • the orifice of said sector is offset during assembly with respect to the orifice of the branch so that when the articulation means are engaged toothed sector is pressed against the bottom of the groove.
  • each toothed sector consists of several blades 10 obtained by cutting and then assembled by a rivet 11 with an end, for example conical, to form a hinge pin without play of the branch to the head yoke.
  • the non-toothed portion of the sectors engages and is fixed in an orifice formed in the branch 2 or engages and is fixed in a branch consisting of a tubular element.
  • the rivet 11 comprises two riveting bases 12 enclosing the blades 10.
  • the ends of the rivet are each engaged in a blind orifice of complementary shape, for example conical formed in a yoke 13 mounted in the yoke of the head and fixed to the latter by the button 1A for maneuvering the compass.
  • the branches 2 can be made from a long, metallic element full of cross-section, for example polygonal or from a tubular element as shown in FIG. 1 which in no way affects the rigidity of the compass while l 'lightening.
  • the branches 2 are telescopic and are constituted by a tubular element containing 2A and a contained tubular element 2B capable of sliding without play in the previous one and of being blocked therein.
  • the containing element 2A is preferably articulated to the head 1 and the contained element 2B is provided at the end with one of the broken pieces.
  • the elements 2A and 2B are formed by tubular metal profiles of polygonal cross section or obtained by cutting and bending a metal plate.
  • each of the elements of each branch has a longitudinal slit allowing an expansion of the element contained in the containing element and a retraction of the element containing on the contained element thanks to their natural elasticity which eliminates the play guidance.
  • the slot 14 of the element 2B and the slot 15 of the element 2A are arranged in the plane of the compass and are arranged in opposition.
  • the slot 14 of the element 2B is disposed on the outside of the compass along its plane to allow the engagement of the locking means in said element.
  • This locking means of the element 2A with respect to the element 2B is for example constituted by a screw 16 whose square head is engaged in the element 2B and whose threaded rod is engaged in the slot 14 and in an orifice formed in the element 2A.
  • the head of the screw is in the form of an inverted truncated cone and is housed in an orifice of complementary shape formed in a part 17 mounted in the element 2B.
  • the width of this part is substantially equal to or greater than the internal width of the element 2B so that when tightening by means of a nut 18 the latter contributes to ensuring the expansion of said element 2B in element 2A this which eliminates any play and provides the branch with good rigidity.
  • element 2B In its lower part, element 2B has a section equal to that of element 2A to limit the penetration of one into the other.
  • the lower end of the branches 2 or of the elements 2B receives a means of blocking and articulation of the broken pieces.
  • This means consists of a screw 19 engaged in an orifice of the branch and of the break and receiving a locking nut.
  • the lower end of the branches or of the element 2B is shaped as an elastic yoke of relatively large length to receive one of the broken pieces and the screw 19.
  • the stiffness bar 5 which undergoes during tracing a tensile bending stress and not a compressive bending stress detrimental to the accuracy of the layout which is the case in the compass prior art.
  • the stiffness bar for example of cylindrical shape, made of metal is perpendicular to each of the broken pieces.
  • This bar is fixed by one of its ends to one of the broken pieces and is capable of sliding and of being fixed in the other. As can be understood, whatever the angular position of the branches 2, this arrangement ensures automatic parallelism of the breaks between them.
  • the bar 5 is provided at one of its ends with a male thread so as to be screwed into a threaded orifice formed in the breakage of the plotter door 3.
  • the tip-holder break 4 is provided above its articulation axis with a cylindrical orifice in which the bar 5 can slide.
  • This orifice is axially extended by a guide bearing 20 of the bar 5.
  • the length of the guide bearing is calculated taking into account the mechanical laws governing bracing to avoid the angular phenomenon of the branches.
  • the length of the guide portion will be a few centimeters.
  • the guide portion is provided with a diametral slot at its cylindrical and longitudinal orifice capable of being deformed by the action of the clamping and articulation means to block the bar 5 in translation.
  • the screw of the clamping and articulation means of the break 4 is engaged in a cylindrical orifice formed under the orifice of the guide bearing and opening into the diametrical slot, this screw advantageously receives a butterfly nut 21 or with manual locking for facilitate blocking or unblocking.
  • the blocking of the bar 5 is ensured automatically by a system of the type with elastic deformation.
  • break 4 and the guide bearing are split above their longitudinal axis.
  • the split end of the break has an orifice for the passage of an articulation and blocking means to the branch 2.
  • This means is advantageously constituted by a screw 23 serving as an axis of articulation for the break 4 which, using a lever 24, will block the bar 5 and the articulation.
  • the lever 24 is provided at one of its ends with an orifice for the passage of the screw, the diameter of said orifice being however less than the diameter of the head which abuts against said lever.
  • the lower end of the lever has a boss centered on the axis of the screw to form a fulcrum.
  • an elastic member for example a spring 25 with an angled leaf, and blocked by one of its ends in an orifice formed in the branch 2.
  • this spring is to move the lever away from the branch 2 and will cause, using the screw, the bringing together of the split parts of the breakage and consequently the elastic deformation of the guide portion which will pinch the bar 5.
  • the slight rotation of the tip-holder part or the approximation or the distance of the branch from the breakage is caused by the action of a threaded screw with differential pitch cooperating respectively with said door part - tip and with the break 4 ..
  • the tip holder part 37 is in the form of a U, between the wings of which the tip of the compass is disposed.
  • This part is housed and articulated by an axis 38 in a longitudinal groove formed in the break.
  • the natural elasticity of the part 36 causes the spacing of each of its wings in the groove which eliminates the play.
  • the heel of the toe piece is disposed outside the groove and cooperates with an elastic member such as a leaf spring 39 wound around the axis 38 and also cooperating with the break. Under the action of the elastic member, the tip-holder part tends to pivot around the axis 38.
  • This action is counterbalanced by an adjusting member constituted by a screw and nut.
  • This threaded rod has a conical end 40 receiving an adjusting nut 41 which comes to bear against the breakage.
  • the point of the compass is locked in the part 37 by a screw and nut with conical head pressing said point against the heel which makes it possible to avoid pinching the wings.
  • the tracer carrier break 3 is provided with a threaded rod for fixing the supports of the tracer members such as a mine and an ink tracer.
  • the ink plotter support is permanently fixed to the break by a knurled button with lock nut screwed both on the threaded rod.
  • This rod is extended downwards by an externally threaded hollow part shaped as a gripper end to receive a lead.
  • This clamp cooperates with a conventional locking device.
  • This arrangement makes it possible to trace with the aid of the mine without being obliged to dismantle the support of the ink tracing member.
  • the present invention makes it possible to produce a compass of great precision and great ease of use by grouping the organs with economy of gestures.

Claims (6)

1. Präzisionszirkel der aus zwei Schenkeln (2) belteht, derer Enden mit beweglichen Scharniergelenken versehen sind, die sogennten Scharniergelenken (3) (4) sind automatisch mit emem Steifigkeitsstab (5) parallel verbunden, welcher durch Verschiebung in einem Führungslager (20) einer der beiden Scharniergelenke (3), (4) angebracht ist und dadurch gekennzeichnet, daß jeder Schenkel mit einem elastischen Gabelkopf versehen ist an dem das entsprechende Scharniergelenk angebracht ist, daß das Scharniergelenk (4) und das Führungslager das Steifigheitsstabs (5) mit einem an der Durchgangsöffnung des Stabs (5) anwesenden Langschlitz versehen sind, daß die Gelenk und Verbindungsnabe (19) des Scharniergelenks die vorgenannten Schlitze durchquert, und die Sperrung der Schlitze die Quersperrung des Steifigkeitsstabs (5) und der Scharniergelenke (3) (4) gegenüber dem entsprechenden Schenkel (2) ermöglicht.
2. Präzisionszirkel nach Anspruch 1, dadurch gekennzeichnet, daß beide Schenkel (2) aus zwei Teleskopelementen bestehen und zwar einem Empfangselement (2A) und einem empfangenen Element (28), dessen Ende mit einem in einem Gabelkopf angebrachten Scharniergelenk versehen ist, an dem ein Festigkeitsstab befestigt ist, um ein Dreiecksystem zwischen Schenkel und Festigkeitsstab zu jeden Abstanden zu bilden.
3. Präzisionszirkel nach Anspruch 1, oder Anspruch 2 dadurch gekennzeichnet, daß die für den Durchgang des Festigkeitsstabs (5) bestimmte Scharniergelenköffnung mit einem Aussen-Führungslager (20) verlangert ist.
4. Präzisionszirkel nach Anspruch 1, dadurch gekennzeichnet, daß der die Scharniergelenke verbindende Festigkeitsstab (5) über den Scharniergelenkbolzen befestigt ist.
5. Präzisionszirkel nach Anspruch 1, dadurch gekennzeichnet, daß die Simultanguersperrung des die Scharniergelenke (3) verbindenden Festigkeitsstabs (5) gegenüber dem entsprechenden Schenkel (2) durch einen auf einer der beiden Schenkel (2) stützenden Hebel (24) versehen ist, der mit einer Feder (25) gestenert ist.
6. Präzisionszirkel nach Anspruch 1 oder Anspruch 1, dadurch gekennzeichnet, daß beide Schenkel (2) aus einem offenen Empfangselement (2A) bestehen, in dem ein verschiebbares, röhrenförmiges, empfangenes Element (2B) gesperrt wird, die beiden Element mit einem Langschlitz (15), (14) versehen sind, das in dem Empfangselement enthaltene Element ausdehnbar ist und das vorletzte gegenüber dem empfangenen Element zusammenzichbar ist.
EP80401223A 1980-08-27 1980-08-27 Präzisionszirkel mit gelenkigem Schenkel und steifer Stange Expired EP0046830B1 (de)

Priority Applications (3)

Application Number Priority Date Filing Date Title
EP80401223A EP0046830B1 (de) 1980-08-27 1980-08-27 Präzisionszirkel mit gelenkigem Schenkel und steifer Stange
DE8080401223T DE3071252D1 (en) 1980-08-27 1980-08-27 Precision compass with articulated legs and rigid cross-bar
AT80401223T ATE16574T1 (de) 1980-08-27 1980-08-27 Praezisionszirkel mit gelenkigem schenkel und steifer stange.

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP80401223A EP0046830B1 (de) 1980-08-27 1980-08-27 Präzisionszirkel mit gelenkigem Schenkel und steifer Stange

Publications (2)

Publication Number Publication Date
EP0046830A1 EP0046830A1 (de) 1982-03-10
EP0046830B1 true EP0046830B1 (de) 1985-11-21

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ID=8187393

Family Applications (1)

Application Number Title Priority Date Filing Date
EP80401223A Expired EP0046830B1 (de) 1980-08-27 1980-08-27 Präzisionszirkel mit gelenkigem Schenkel und steifer Stange

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EP (1) EP0046830B1 (de)
AT (1) ATE16574T1 (de)
DE (1) DE3071252D1 (de)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
YU45594B (sh) * 1984-02-22 1992-07-20 Đorde Rabatić Univerzalno geometrijsko pomagalo
DE3544537A1 (de) * 1985-12-17 1987-09-10 Ulrich Dipl Ing Schuh Schnurgefuehrte reissschiene mit verdeckt liegenden schnueren und einsteckbarer schnurumlenkung
DE4215336C2 (de) * 1992-05-09 1997-06-26 Dieter Oswald Zirkel
CN102390202B (zh) * 2011-08-18 2013-08-21 河南师范大学 多功能画规

Family Cites Families (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE79668C (de) *
DE493458C (de) * 1930-03-06 Bayerische Reisszeugfabrik A G Stechzirkel mit Feineinstell-Vorrichtung fuer die eine Zirkelspitze
GB189524765A (en) * 1895-12-27 1896-10-17 Robert Lund Donkin Trammel Compass and Divider.
BE488355A (de) * 1948-04-09
FR1021055A (fr) * 1950-06-28 1953-02-13 Compas perfectionné, pour dessinateurs
US2701917A (en) * 1952-11-13 1955-02-15 Piab Ab Compass
CH379777A (de) * 1960-03-11 1964-07-15 Piab Ab Zirkel zum Zeichnen
GB934034A (en) * 1962-06-08 1963-08-14 Yut Chow An improved drawing instrument
FR2451831A1 (fr) * 1979-03-20 1980-10-17 Bras Jean Compas de precision a barre de rigidite

Also Published As

Publication number Publication date
EP0046830A1 (de) 1982-03-10
ATE16574T1 (de) 1985-12-15
DE3071252D1 (en) 1986-01-02

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