EP0217974A1 - Gerät zum Zeichnen von Kreisen mit einer drehbaren Führung - Google Patents

Gerät zum Zeichnen von Kreisen mit einer drehbaren Führung Download PDF

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Publication number
EP0217974A1
EP0217974A1 EP19850112655 EP85112655A EP0217974A1 EP 0217974 A1 EP0217974 A1 EP 0217974A1 EP 19850112655 EP19850112655 EP 19850112655 EP 85112655 A EP85112655 A EP 85112655A EP 0217974 A1 EP0217974 A1 EP 0217974A1
Authority
EP
European Patent Office
Prior art keywords
instrument according
disk
sheet
center
instrument
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.)
Withdrawn
Application number
EP19850112655
Other languages
English (en)
French (fr)
Inventor
Sergio Fabris
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.)
Individual
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 EP19850112655 priority Critical patent/EP0217974A1/de
Publication of EP0217974A1 publication Critical patent/EP0217974A1/de
Withdrawn legal-status Critical Current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
    • B43L9/002—Circular curve-drawing or like instruments with perforated or marked discs

Definitions

  • This invention relates to a rotating guide instrument or tool for drawing circles.
  • circle drawing stencils For drawing circles without a compass, circle drawing stencils have been available which comprise as many different diameter circular holes as are the circles to be drawn thereby.
  • stencils must have an area which is at least slightly larger than the combined areas of the holes cut through it.
  • a stencil having a full set of circular holes ranging in diameter from 1 mm up to 35 mm with 1 mm increments already covers an area of 3 00 cm 2 . It the largest diameter in the stencil is to be increased further, then the overall area of the stencil is bound to increase exponentially to soon reach an unmanageable size.
  • a further object is to provide an instrument as indicated, which can be manufactured of a small number of component parts, to be formed, for example, from plastics, so as to be of a low cost to extend its application potential.
  • a rotating guide instrument for drawing circles characterized in that it comprises a movable member having at least a portion thereof with a circular contour profile and being slidable, by rotation about the center thereof, along matingly shaped guide means provided on a fixed member, said movable member having guiding passages for a tracing point arranged at varying distances from said center.
  • a first embodiment of this instrument for drawing circles comprises a fixed member advantageously composed of a preferably transparent or clear plastics sheet 2 which, in addition to having circle drawing holes 3 like ordinary stencils, has a number of circular openings 4 on the inside whereof corresponding disks, advantageously forming the instrument movable members, are fitted for unrestricted rotation about their center.
  • the sliding fit or coupling between the sheet 2 and disks 5 is a single piece construction made demountable by the provision, in a first variation shown in Figure 2, of a substantially cylindrical circular opening 4 the wall 6 of which has a projecting annular rim portion 7 fitting in a corresponding circumferential recessed portion 8 in the rim 9 of the disk 5.
  • That recessed portion 8 is included between a projecting head 10, abutting the top face 11 of the sheet 2, and at the opposed end, an enlarged base 12 having a rounded outer edge 13.
  • the disk 5 can thus be coupled with the sheet 2 by inserting the enlarged base.12 into the circular opening 4 and applying a slight pressure to crown the sheet 2 and enable the enlarged base to move past the projecting portion 7, the operation being made .easier by the rounded outer edge 13.
  • the coupling also allows the disk 5 to be pulled off by applying a slight pressure to the enlarged base 12, such as for the purpose of periodically cleaning the coupling.
  • the circular opening 4a is made conical and the projecting portion is provided by its narrow region 14, located at the top face 11.
  • the disk 5 is pressed in by forcing the head 10a through the large end of the opening 4a and crowning the sheet 2 slightly to a snap fit.
  • the recessed portion 8a is connected to the enlarged base 12a by an intermediate portion 15 the taper whereof facilitates pulling the disk 5 out of its manufacturing mold.
  • the wall 6b of the circular opening 4b is configured as a double cone defining a projecting mid-portion 16; the disk 5 has an enlarged base 12b which can be pressed in past the mid-portion 16, utilizing either taper 17 of the opening 4b, and which can be withdrawn from the same side by utilizing the other taper 18 where its conical pattern perfprms a lead-in action.
  • a fourth variation envisages a disk 5 whose enlarged base 12c, by virtue of its conical taper, can be snapped in through the small end of an opening 4c, also conical; withdrawal is accomplished here too through the small end by applying a pressure to the enlarged base 12c and utilizing the taper of the opening 4c.
  • annular groove 55 is provided in the sheet 2 which is open at the top face 11; a similar function is served by the annular groove 55 provided in the enlarged base 12 as shown in Figure 2.
  • guiding passageways comprising conical perforations 19, which are laid each at a different distance from the center of the respective disk and distributed along a spiralling line that ends within one turn.
  • the disks 5 carry a numbering indicative of the respective diameters provided by the perforations 19; expendiently, such numbering would be number marks 20 which.would be all placed substantially at the same distance from the center of the disk 5, inwardly of the spiralling line and radially aligned to a respective perforation.
  • the centerpoint of the disks 5 is.brought out by the provision of two orthogonal axes 22 thereon.
  • a sheet 2 of rectangular shape which has printed on at least two of its adjoining straight sides 23, orthogonal to each other, a measuring scale 24 whereby the instrument 1 may be used as a set square.
  • the instrument 1 is also arranged for connection, through two connecting pins 25 projecting from the top face 11 of the sheet 2, to a holder, not shown, having two rollers which can be wheeled across an underlying drawing sheet to move the sheet 2 always parallel to one side 23 thereof owing to their being mounted rigidly to a common axle.
  • the sheet 2 also has a first goniometric scale 28 printed thereon whose vertex lies at a hole 29, e.g. a conical one, wherewith a movable pushbutton 30, better shown in Figure 6, is associated which can be depressed to bring the base 31 to engage with the rest surface ; thus, it becomes possible to rotate the sheet 2 around the pushbutton 30, i.e. about the vertex of the first goniometric scale 28, e.g. to rotate through a preset angle one side 23 thereof relatively to a first line being the side of an angle and draw the other side of the angle, at an inclination with respect to the former by a - selected amount.
  • a goniometric scale 28 printed thereon whose vertex lies at a hole 29, e.g. a conical one, wherewith a movable pushbutton 30, better shown in Figure 6, is associated which can be depressed to bring the base 31 to engage with the rest surface ; thus, it becomes possible to rotate the sheet 2 around the pushbutton 30,
  • a second goniometric scale 32 having its vertex coincident with the center of one of the disks 5; in this respect, that disk 5 has two diametrically opposed eyes 33 about its center through which a pair of connecting pins 34 may be passed which are pressure lockable to the rest surface of a removable rod 35 indicated by a dash line in Figure 1.
  • At least one of the ends 36 of the rod 35 has, at the index 37, an elevation 38 which snap engages into notches 39 provided in the sheet 2 and evenly distributed along the second goniometric scale 32.
  • the principle of operation of the instrument 1 herein consists of providing for the tracer point a guide on a movable member which is secured at at least two points of its circular contour, and based on this same principle other embodiment forms may be provided wherein both the movable and fixed members may have different shapes.
  • a second embodiment shown in Figures 7 and 8, comprises a fixed member, comprising essentially a side guide 40 having, on a peripheral substantially circular portion 41 thereof, a recess with undercut portions 42 which fit slidably on the matingly shaped rim 9a of a rotating disk 5a.
  • This second embodiment illustrates one possible variation of the guide passageways for the tracer point, which comprise in this case a perforation 43 formed through the free end 44 of a flat bar 45 the opposed end 46 whereof is journalled to the disk 5a; thus, the bar 45 can swing relatively to the disk 5a to move the perforation 43 to overlie a passageway 47, and can be locked temporarily in the set position, e.g. by means of a nut on the end 46.
  • Figure 9 shows a third embodiment wherein the fixed member comprises a bracket 48 of substantially L-like shape which carries two separate pairs of side-by-side rotating rollers 49 between which a peripheral circumferential elevation 50 runs of a disk 5b which is thus guided in its rotation about its center,
  • the third embodiment also illustrates a possible variation of the guide passageways for the tracer point, which comprise here a pair of perforations 51 formed in a slider 52 arranged to slide in a radial slot 53 of the disk 5b and to be locked in a desired position.
  • Drawing circles is extremely accurately effected, both by virtue of the principle adopted and of the specific design of the coupling between the rotating disk 5 and sheet 2 which, while being of unitary construction, provides a sliding movement with the least of play and friction and at the same time the faculty to manually disassemble and assemble the component parts together in a very simple manner.
  • small balls or bearing needles may be interposed thereto as shown by way of example in Figure 1 at 54.
EP19850112655 1985-10-06 1985-10-06 Gerät zum Zeichnen von Kreisen mit einer drehbaren Führung Withdrawn EP0217974A1 (de)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP19850112655 EP0217974A1 (de) 1985-10-06 1985-10-06 Gerät zum Zeichnen von Kreisen mit einer drehbaren Führung

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP19850112655 EP0217974A1 (de) 1985-10-06 1985-10-06 Gerät zum Zeichnen von Kreisen mit einer drehbaren Führung

Publications (1)

Publication Number Publication Date
EP0217974A1 true EP0217974A1 (de) 1987-04-15

Family

ID=8193808

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19850112655 Withdrawn EP0217974A1 (de) 1985-10-06 1985-10-06 Gerät zum Zeichnen von Kreisen mit einer drehbaren Führung

Country Status (1)

Country Link
EP (1) EP0217974A1 (de)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1989004770A1 (en) * 1987-11-26 1989-06-01 Helen Chui Lan Chai Drawing instrument
US5125161A (en) * 1990-03-23 1992-06-30 Guthrie Darren E Drafting instrument
US5384964A (en) * 1992-10-05 1995-01-31 Mckay; Dennis E. Rotary circle template
US5390418A (en) * 1993-07-26 1995-02-21 Buono; Patricio A. Tool for drawing circumferences

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1900278A1 (de) * 1968-01-24 1969-07-31 Frey Arnold Jack Zeichengeraet
DE2120783A1 (de) * 1971-04-28 1972-11-02 Arkenberg, Karl-Heinz, 2000 Hamburg Vorrichtung zum Zeichnen von Kreisen
DE2431466A1 (de) * 1974-07-01 1976-01-22 Adalbert Steinhauser Universal-kreis- und kurven-abrundungsschablone zum aufzeichnen und ausschneiden ohne schere
US4222171A (en) * 1979-08-31 1980-09-16 Malacheski Joseph J Drafting instrument
DE8503290U1 (de) * 1985-02-07 1985-06-20 Linden, Ludwig, 5000 Köln Zeichengerät

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1900278A1 (de) * 1968-01-24 1969-07-31 Frey Arnold Jack Zeichengeraet
DE2120783A1 (de) * 1971-04-28 1972-11-02 Arkenberg, Karl-Heinz, 2000 Hamburg Vorrichtung zum Zeichnen von Kreisen
DE2431466A1 (de) * 1974-07-01 1976-01-22 Adalbert Steinhauser Universal-kreis- und kurven-abrundungsschablone zum aufzeichnen und ausschneiden ohne schere
US4222171A (en) * 1979-08-31 1980-09-16 Malacheski Joseph J Drafting instrument
DE8503290U1 (de) * 1985-02-07 1985-06-20 Linden, Ludwig, 5000 Köln Zeichengerät

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1989004770A1 (en) * 1987-11-26 1989-06-01 Helen Chui Lan Chai Drawing instrument
US5125161A (en) * 1990-03-23 1992-06-30 Guthrie Darren E Drafting instrument
US5384964A (en) * 1992-10-05 1995-01-31 Mckay; Dennis E. Rotary circle template
US5390418A (en) * 1993-07-26 1995-02-21 Buono; Patricio A. Tool for drawing circumferences

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PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

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17P Request for examination filed

Effective date: 19861217

AK Designated contracting states

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Designated state(s): DE FR GB

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Effective date: 19870902

STAA Information on the status of an ep patent application or granted ep patent

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18D Application deemed to be withdrawn

Effective date: 19880113