EP0046830A1 - Präzisionszirkel mit gelenkigem Schenkel und steifer Stange - Google Patents

Präzisionszirkel mit gelenkigem Schenkel und steifer Stange Download PDF

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Publication number
EP0046830A1
EP0046830A1 EP80401223A EP80401223A EP0046830A1 EP 0046830 A1 EP0046830 A1 EP 0046830A1 EP 80401223 A EP80401223 A EP 80401223A EP 80401223 A EP80401223 A EP 80401223A EP 0046830 A1 EP0046830 A1 EP 0046830A1
Authority
EP
European Patent Office
Prior art keywords
bar
break
compass
articulation
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.)
Granted
Application number
EP80401223A
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English (en)
French (fr)
Other versions
EP0046830B1 (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 DE8080401223T priority Critical patent/DE3071252D1/de
Priority to AT80401223T priority patent/ATE16574T1/de
Priority to EP80401223A priority patent/EP0046830B1/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.
  • compasses 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 being blocked in both.
  • stiffness bar is located below the points of articulation of broken branches and therefore is subject to compressive bending stress increasing the risk 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.
  • the compass according to the invention of the type comprising two parallel breaks joined by a stiffness bar is essentially characterized in that it comprises a rapid locking and unlocking means acting simultaneously on the rotation of the breaks, the transverse deviations and the translational movement of the sliding bar in one of the broken pieces and by the fact that the distance of the articulation axes of the broken pieces to the bearing axis is a function of this guide length of the rod to avoid bracing during opening maneuvers.
  • 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 are articulated two branches 2 each provided at the lower end with a point of articulation of a broken tracer holder 3 or tip holder 4 joined together. to the other by a stiffness bar 5.
  • the head 1 is constituted by a cap in which the two branches 2 are mounted, cooperating with each other by means of at least two toothed sectors 6 which mesh with each other.
  • 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 the said branch at the head 1.
  • this means consists of a cylindrical axis B terminated at each of its ends by a spherical cap partially engaged in orifices provided in the chappe.
  • the hinge 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 chappe ".
  • 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 constitute an axis of articulation without play from the branch to the head yoke.
  • the non-toothed portion of the sectors engages and is fixed in an orifice formed in the strip 2 or engages and is fixed in a branch made up 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 1 A for maneuvering the compass.
  • a blind orifice of complementary shape for example conical
  • the branches 2 can be made from a long, metal 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 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 for example rectangular consist of 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 blocking 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, this contributes to ensuring the expansion of said element 2B in the element 2A which eliminates any play and provides the branch with good rigidity.
  • 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, under the action of the tightening nut the blanks of the yoke are brought together and enclose the upper end of the corresponding break to ensure angular and axial locking.
  • the stiffness bar 5 which undergoes during tracing a tensile bending stress and not a compression bending stress prejudicial to the accuracy of the layout which is the case in the compasses of the 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.
  • 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 1.
  • the length of the guide bearing is calculated by taking into account the mechanical laws governing the bracing to avoid the angular phenomenon of the branches.
  • the length of the guide portion will be a few centimeters.
  • the guide portion and the break 4 are part of a single piece, but one can provide as shown in Figures 7 and 8 a guide portion attached to the break.
  • 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 1 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 blocking to facilitate hbcage 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 locking means to the arm 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 1 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 crack and therefore the elastic deformation of the guide portion which will pinch the bar 1.
  • the guide portion is related to the break and is provided at the end with diametric slots to form a clamp.
  • This clamp is threaded to cooperate with a means for blocking the bar 5 independent of the means for blocking the break relative to the branch.
  • This locking means is constituted by a threaded button 26 for screwing at the end of the guide portion and comprising a conical zone intended to come into contact with the clamp for locking 7 against the bar 1 ..
  • the bar 5 is blocked by a button 27 cooperating with a clamp 28 in which the said bar slides.
  • the clamp 28 is slidably mounted in an orifice in the break 4 and has a thread cooperating with a tapping of the button 27.
  • the button 27 comes to bear against the breakage and exerts a traction on the clamp which comes into abutment in its orifice and blocks
  • the crack 4 is provided with a means for micrometric adjustment of the tracing radius.
  • the break 4 is provided with a slotted end extended downwards by a blade 29 carrying known means in itself for blocking a point 30 (FIG. 7)
  • the break has an axial threaded orifice with a biconical orifice formed in the blade 29 of the break.
  • the micrometric adjustment means is constituted by a screw 31 engaging in the tapped hole of the break
  • This screw is terminated by a biconical stud 32 which cooperates with a biconical orifice of the blade.
  • the rotation in one direction or the other of the adjusting screw causes the tip 30 to move towards or away.
  • the fine adjustment of the tracing radius is obtained by a slight rotation of a tip-holder part 33 articulated to the break 4 by an axis 34.
  • This part 33 is provided with an orifice passage of a rod, partly threaded, terminated by a stud, for example a conical pin for centering said rod on the break 4.
  • the break 4 is possible from a cylindrical orifice which is axial to the rod receiving an elastic member, for example a spring 35 which cooperates with the tip-carrying part.
  • This elastic member is arranged around the rod and rests on the break 4 and the piece carries the tip and tends to separate the said piece from the tip of the break.
  • the screwing or unscrewing of the nut 35 will cause the tip-holder part 33 to rotate about its axis 34.
  • 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 - point and with the break 4.
  • the tip-holder part is in the form of a U 37, 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.
  • the tip-holder part tends to pivot around the axis 38.
  • This action is designed rebalanc t e e 'by an actuator constituted by a screw and nut.
  • the tip of the compass is locked in the part 36 by a screw and nut with a conical head pressing the said tip against the heel which prevents pinching of the wings.
  • the plotter holder break 3 is provided with a threaded rod for fixing the supports of the plotter members such as a lead and an ink plotter.
  • 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.

Landscapes

  • Pivots And Pivotal Connections (AREA)
  • Toys (AREA)
  • Drilling And Boring (AREA)
  • Prostheses (AREA)
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
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.
EP80401223A EP0046830B1 (de) 1980-08-27 1980-08-27 Präzisionszirkel 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 true EP0046830A1 (de) 1982-03-10
EP0046830B1 EP0046830B1 (de) 1985-11-21

Family

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

Country Status (3)

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

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2155407A (en) * 1984-02-22 1985-09-25 Djordje Rabatic Geometric device
EP0226214A1 (de) * 1985-12-17 1987-06-24 Ulrich Dipl.-Ing. Schuh Schnurgeführte Reissschiene mit verdeckt liegenden Schnüren und einsteckbarer Schnurumlenkung
DE4215336A1 (de) * 1992-05-09 1993-11-11 Dieter Oswald Zirkel
CN102390202A (zh) * 2011-08-18 2012-03-28 河南师范大学 多功能画规

Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE79668C (de) *
GB189524765A (en) * 1895-12-27 1896-10-17 Robert Lund Donkin Trammel Compass and Divider.
DE493458C (de) * 1930-03-06 Bayerische Reisszeugfabrik A G Stechzirkel mit Feineinstell-Vorrichtung fuer die eine Zirkelspitze
FR984259A (fr) * 1948-04-09 1951-07-04 Compas et accessoires pour dessin obtenus entièrement par emboutissage
FR1021055A (fr) * 1950-06-28 1953-02-13 Compas perfectionné, pour dessinateurs
US2701917A (en) * 1952-11-13 1955-02-15 Piab Ab Compass
GB934034A (en) * 1962-06-08 1963-08-14 Yut Chow An improved drawing instrument
CH379777A (de) * 1960-03-11 1964-07-15 Piab Ab Zirkel zum Zeichnen
FR2451831A1 (fr) * 1979-03-20 1980-10-17 Bras Jean Compas de precision a barre de rigidite

Patent Citations (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.
FR984259A (fr) * 1948-04-09 1951-07-04 Compas et accessoires pour dessin obtenus entièrement par emboutissage
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

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2155407A (en) * 1984-02-22 1985-09-25 Djordje Rabatic Geometric device
EP0226214A1 (de) * 1985-12-17 1987-06-24 Ulrich Dipl.-Ing. Schuh Schnurgeführte Reissschiene mit verdeckt liegenden Schnüren und einsteckbarer Schnurumlenkung
DE4215336A1 (de) * 1992-05-09 1993-11-11 Dieter Oswald Zirkel
CN102390202A (zh) * 2011-08-18 2012-03-28 河南师范大学 多功能画规
CN102390202B (zh) * 2011-08-18 2013-08-21 河南师范大学 多功能画规

Also Published As

Publication number Publication date
DE3071252D1 (en) 1986-01-02
ATE16574T1 (de) 1985-12-15
EP0046830B1 (de) 1985-11-21

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