EP0391027A2 - Compas, en particulier pour dessinateurs - Google Patents

Compas, en particulier pour dessinateurs Download PDF

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Publication number
EP0391027A2
EP0391027A2 EP90101379A EP90101379A EP0391027A2 EP 0391027 A2 EP0391027 A2 EP 0391027A2 EP 90101379 A EP90101379 A EP 90101379A EP 90101379 A EP90101379 A EP 90101379A EP 0391027 A2 EP0391027 A2 EP 0391027A2
Authority
EP
European Patent Office
Prior art keywords
compass
rod
runner
slider
bow
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
EP90101379A
Other languages
German (de)
English (en)
Other versions
EP0391027A3 (en
EP0391027B1 (fr
Inventor
Roberto Bergonzi
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.)
ILCA SpA
Original Assignee
ILCA SpA
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 ILCA SpA filed Critical ILCA SpA
Publication of EP0391027A2 publication Critical patent/EP0391027A2/fr
Publication of EP0391027A3 publication Critical patent/EP0391027A3/en
Application granted granted Critical
Publication of EP0391027B1 publication Critical patent/EP0391027B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime 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
    • B43L9/22—Leg-angle adjusting-means separate from pivots

Definitions

  • the present invention relates to a compass, particularly to a draughtsman compass of the type usually called bow compass or spring bow compass.
  • the bow compass is a compass adapted to draw circles or sections of circles of small radius and it is generally provided in two basic types.
  • a first type of bow compass has two hinged rods holding a point at each of their lower ends; one of the points can be substituted by a lead holder or a drawing pen.
  • a threaded bar has one end fastened to a median portion of one of the rods and engages a ring associated to the other rod but adapted to be rotated to finely adjust the distance between the two rods.
  • a rod element has a longitudinal bore in which a point is slidable along its longitudinal axis; a resilient member is associated to the rod element and its distance from the rod element itself, i.e. the aperture of the compass, is adjusted by means of a screw.
  • a lead holder or a drawing pen can be fastened to the resilient member.
  • the bow compasses of the prior art are susceptible to improvements regarding their mechanical reliability and their operation, especially if their structure is provided in plastics, for example, instead of the usual metallic materials.
  • the traditional bow compasses are also rather heavy in order to ensure a sturdy structure for a precise operation.
  • the aim of the present invention is that of providing a compass for draughtsmen, particularly a bow compass, that, owing to a particular geometrical configuration, eases the hand movement in the drawing and at the same time ensures an absolute precision.
  • an object of the invention is that of providing a bow compass which is constructively simple and easy to use.
  • Another object of the invention is that of providing a bow compass having low manufacturing costs.
  • a compass particularly for draughtsmen, comprising a first and a second rod elements, said second rod element being hinged to said first rod element at their upper ends, a point being associated with the lower end of said first element, fastening means for drawing means being associated with the lower end of said second element, characterized in that it comprises a slider member having a first end slidable in a first runner in said first rod element and a second end slidable in a second runner in said second element, said first and second runners being laid out in said first and second rod elements such that a progressive shift of said slider corresponds to a progressive aperture of said first and second rod elements relatively to each other.
  • a draughtsman compass 1 will be described, of the type usually called bow compass, adapted to draw circles of small radius.
  • the bow compass 1 comprises a first rod element 2 hinged to a second rod element 3 by means of an upper head 4.
  • the lower end of the first element 2 has a point 5, while the lower end of the second element 3 has a fastening means 6 for drawing means such as, for example, a lead holder or a drawing pen, not illustrated in the drawings for brevity.
  • a first runner is provided by means of two rectilinear grooves 7, on opposite sides of the first element, parallely laid out on the axis of the same first element.
  • a second runner is formed on the second element 3 and is provided by means of two grooves 8, again on opposite sides of the second element, slanted of a set angle relatively to the axis of the second element.
  • the runners of the first and second rod elements are engaged by the ends of a slider element 9 comprising a core 10 and two plates 11 provided with pins 12 adapted to slide in the grooves 7 and 8.
  • a threaded bore 13 is provided in the core 10 and is engaged by a screw element 14 supported on the first rod element 2.
  • the screw element 14 is substantially at the axis of the first element 2 and is inserted upwardly in the hand grip 15 of the bow compass.
  • a knob 16 is fastened on the upper end of the screw element to manually rotate the screw element itself.
  • the operation of the bow compass is very simple, it is in fact sufficient to rotate the knob 16 for axially displacing the slider 9 causing the two rod elements 2 ,3 to open or close, adjusting the aperture of the compass, because of the relative configuration of the grooves 7 and 8.
  • an advantage of the invention is that of the hand grip which is provided on the axis of rotation of the bow compass itself and which comprises also the aperture adjusting knob.
  • Another advantage of the particular structure of the bow compass according to the invention is that of allowing the use of different materials still keeping a remarkable mechanical reliability.
  • the compass according to the invention may have numerous modifications and variations, all within the inventive concept; furthermore, all the details may be substituted with technically equivalent elements.
  • the materials employed, as well as the dimensions, may be any according to the specific needs and the state of the art.

Landscapes

  • Mechanical Control Devices (AREA)
  • Transmission Devices (AREA)
  • Purses, Travelling Bags, Baskets, Or Suitcases (AREA)
  • Length-Measuring Instruments Using Mechanical Means (AREA)
EP90101379A 1989-03-20 1990-01-24 Compas, en particulier pour dessinateurs Expired - Lifetime EP0391027B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
IT1981589 1989-03-20
IT8919815A IT1228671B (it) 1989-03-20 1989-03-20 Compasso, particolarmente per disegnatori.

Publications (3)

Publication Number Publication Date
EP0391027A2 true EP0391027A2 (fr) 1990-10-10
EP0391027A3 EP0391027A3 (en) 1990-11-22
EP0391027B1 EP0391027B1 (fr) 1994-04-13

Family

ID=11161512

Family Applications (1)

Application Number Title Priority Date Filing Date
EP90101379A Expired - Lifetime EP0391027B1 (fr) 1989-03-20 1990-01-24 Compas, en particulier pour dessinateurs

Country Status (4)

Country Link
EP (1) EP0391027B1 (fr)
DE (1) DE69008013T2 (fr)
ES (1) ES2050850T3 (fr)
IT (1) IT1228671B (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1997031787A1 (fr) * 1996-03-02 1997-09-04 Bernhard Hauri Compas a partie de prehension

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE77106C (de) * H. SCHWARTZ in Berlin, Arndtstr. 44 Zirkel mit am Kopf angebrachter Mefsskala
FR646998A (fr) * 1928-01-23 1928-11-19 Compas à tracer des ellipses et des courbes
US1958989A (en) * 1932-07-19 1934-05-15 Fischer John Compass
GB448202A (en) * 1936-01-08 1936-06-04 Universal Woodworking Company Improvements in drawing compasses and dividers
US2864172A (en) * 1956-11-14 1958-12-16 Buck Ralph Divider
DE2851961A1 (de) * 1977-12-06 1979-06-07 Vyzk Vyvojovy Ustav Elektric Ergreifungskopf, insbesondere fuer industrieroboter

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE77106C (de) * H. SCHWARTZ in Berlin, Arndtstr. 44 Zirkel mit am Kopf angebrachter Mefsskala
FR646998A (fr) * 1928-01-23 1928-11-19 Compas à tracer des ellipses et des courbes
US1958989A (en) * 1932-07-19 1934-05-15 Fischer John Compass
GB448202A (en) * 1936-01-08 1936-06-04 Universal Woodworking Company Improvements in drawing compasses and dividers
US2864172A (en) * 1956-11-14 1958-12-16 Buck Ralph Divider
DE2851961A1 (de) * 1977-12-06 1979-06-07 Vyzk Vyvojovy Ustav Elektric Ergreifungskopf, insbesondere fuer industrieroboter

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1997031787A1 (fr) * 1996-03-02 1997-09-04 Bernhard Hauri Compas a partie de prehension

Also Published As

Publication number Publication date
EP0391027A3 (en) 1990-11-22
DE69008013T2 (de) 1994-11-17
ES2050850T3 (es) 1994-06-01
IT1228671B (it) 1991-07-03
DE69008013D1 (de) 1994-05-19
IT8919815A0 (it) 1989-03-20
EP0391027B1 (fr) 1994-04-13

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