EP0065375A1 - Zeichendreieck - Google Patents

Zeichendreieck Download PDF

Info

Publication number
EP0065375A1
EP0065375A1 EP82302248A EP82302248A EP0065375A1 EP 0065375 A1 EP0065375 A1 EP 0065375A1 EP 82302248 A EP82302248 A EP 82302248A EP 82302248 A EP82302248 A EP 82302248A EP 0065375 A1 EP0065375 A1 EP 0065375A1
Authority
EP
European Patent Office
Prior art keywords
set square
line
aperture
angles
straight edge
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
EP82302248A
Other languages
English (en)
French (fr)
Other versions
EP0065375B1 (de
Inventor
Donald Lionel Hore
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.)
Paraflux Ltd
Original Assignee
Paraflux Ltd
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 Paraflux Ltd filed Critical Paraflux Ltd
Publication of EP0065375A1 publication Critical patent/EP0065375A1/de
Application granted granted Critical
Publication of EP0065375B1 publication Critical patent/EP0065375B1/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
    • B43L7/00—Straightedges
    • B43L7/027—Plural non-adjustable straightedges fixed at right angles
    • B43L7/0275—Triangles

Definitions

  • the present invention relates to a set square.
  • Set squares in general are well known.
  • the usual form is that of a right angled triangle whose other angles are both 45° or are 60° and 30°.
  • the square is commonly made of a plastics material or metal.
  • U.S. Patent 2,043,729 discloses a 90/45/45° set square having three cut-outs which provide various straight edges at predetermined angles to external edges. There are also numerous apertures for use in drawing circles, and a protractor scale. The whole is of dauntingly complicated appearance, and would apparently require much practice to master.
  • U.S. 1,598,690 discloses a 90/60/30° set square with three apertures (a slot and two triangles) for providing further angles. The triangles are right-angled, with the perpendicular sides parallel to those of the set-square. Thus only the hypotenuses provide additional angles. Generally, a given angle is obtainable only relative to one particular external side. Thus the user must locate the square the correct way up, and select the correct aperture. There is also a protractor scale, symmetrical about the 90° angle of the square, its origin indicated by an aperture.
  • a substantially triangular set square having three external straight edge portions with angles of 30°, 60° and 90 0 defined by respective pairs thereof, and an internal substantially triangular aperture having respective straight edge portions which define angles of 15° and 45° with each of the external straight edge portions.
  • a draughtsman using a T-square can set the four usual angles (30,45,60,90°), and also obtain angles of 15° and 75 0 .
  • the straight edge portions of the aperture define a 30°, 30°, 120° triangle.
  • a user even without a T-square, can set angles precisely. Angles can be drawn easily and accurately, particularly interior angles of the aperture, but also angles formed by one side of the cut-out and one external edge portion. Use of the interior angles to draw vertices is of course not affected by the degradation of the external corner portions of the square, which commonly happens in use.
  • a straight line at right-angles to one of the external straight edge portions other than that defining the hypotenuse said line traversing the aperture.
  • This line can be used to set 45, 60, 75 and 90° angles precisely, without the need for a T-square. The line is then used as a reference instead of an external edge/portion.
  • protractor scale arranged so that the origin of the protractor is at the intersection of said line and the straight edge portion at right angles thereto, said line indicating the 90° line of the protractor. Having the origin of the protractor at the edge makes the protractor particularly simple to use, e.g. for setting the square at any desired angle to a given line.
  • the versatility of the implement can be increased by providing one or more of the edge portions with measuring scales and/or by providing a plurality of holes at predetermined spacings for receiving pencil points for drawing arcs of predetermined radii.
  • the set square 1 shown in Figs. 1 and 2 has the general form of a 30/60/90° triangle ABC, having sides a and c at right angles, and side b as hypotenuse. Angles A and C are 30° and 60° respectively.
  • An aperture 2 has the form of a 30/30/120° triangle PQR, the sides p and r and the angles P and R being equal. It is oriented so that its longest side q is adjacent the hypotenuse b, and makes an angle of 150 therewith, approaching nearer it towards the vertex C.
  • the single cut-out 2 provides angles of 15 0 and 45° to each external side a,b,c as follows:
  • Angles of 75 0 to sides a and c are also provided, by sides r and p respectively.
  • the square 1 may bear indicia for showing the user where to obtain various angles.
  • a line 3 is indicated (suitably by an inked indentation), extending at right angles to edge c from a point 0 thereon.
  • the line 3 is interrupted by the aperture 2, and continues on the other side thereof until it reaches an arcuate slot 4 furnished with protractor scales 5.
  • the slot and scales have their centre of origin at 0.
  • the edge c and the line 3 are respectively the 0/180° and 90° lines of the protractor.
  • the square 1 can easily be positioned at any desired angle to a given line.
  • the slot 4 extends only over about 95° , angles up to 180° can be measured or set by using either the edge c or the line 3 as the reference line. Having the line 3 traverse the aperture 2 makes it easy to align with a line on a drawing even if the square 1 is opaque.
  • the longer external sides b,c are provided with scales 7 graduated in inches and centimetres respectively.
  • Adjacent side c is a line of small apertures 8: five with 2mm spacings, seven more at 1cm spacings, and another 7cm from the last of these.
  • the apertures 8 are dimensioned to receive pencil points with minimal play, so that arcs of known radii can be drawn using two pencils.
  • This instrument design does not necessitate transparency, and it may be manufactured in any suitable material such as metal or plastics by any conventional means. If sheet metal or plastics is to be used, section X-Y in Fig.2 shows typically how its structure can be stiffened to minimise the material thickness and weight, and also provide additional benefits. A fold 9 can be pressed or moulded all round the periphery of the instrument, resulting in bevelled edges 10 for the scales 7. This not only provides stiffening, but improves the appearance, and also enables the instrument to be used face down with advantage when using pen and ink, to discourage running of the ink as may occur with a flat surface against the paper.
  • FIG.1 shows an alternative arrangement with an aperture 2' formed as a 30/60/90° triangle XYZ with sides x,y,z.
  • the hypotenuse y is at 15° to side b, and 45° to side a.
  • the shortest side z is at 15° to side c, and 45° to side a.
  • the other side x is at 15 0 to side a and 45° to side b.

Landscapes

  • Length-Measuring Instruments Using Mechanical Means (AREA)
EP19820302248 1981-05-07 1982-04-30 Zeichendreieck Expired EP0065375B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB8113988 1981-05-07
GB8113988 1981-05-07

Publications (2)

Publication Number Publication Date
EP0065375A1 true EP0065375A1 (de) 1982-11-24
EP0065375B1 EP0065375B1 (de) 1984-11-28

Family

ID=10521636

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19820302248 Expired EP0065375B1 (de) 1981-05-07 1982-04-30 Zeichendreieck

Country Status (2)

Country Link
EP (1) EP0065375B1 (de)
DE (1) DE3261353D1 (de)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106079978A (zh) * 2016-08-11 2016-11-09 鲁子航 新型格尺

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1598690A (en) * 1924-10-23 1926-09-07 Jerome A Petronio Drafting triangle
DE585040C (de) * 1931-12-15 1933-09-28 Christof Kammerer Rechtwinkeliges Zeichendreieck
US2043729A (en) * 1932-06-08 1936-06-09 James K Bilder Drafting instrument
CH205209A (de) * 1938-09-15 1939-06-15 Sartori Antonio Zeichenwinkel.

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1598690A (en) * 1924-10-23 1926-09-07 Jerome A Petronio Drafting triangle
DE585040C (de) * 1931-12-15 1933-09-28 Christof Kammerer Rechtwinkeliges Zeichendreieck
US2043729A (en) * 1932-06-08 1936-06-09 James K Bilder Drafting instrument
CH205209A (de) * 1938-09-15 1939-06-15 Sartori Antonio Zeichenwinkel.

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106079978A (zh) * 2016-08-11 2016-11-09 鲁子航 新型格尺

Also Published As

Publication number Publication date
DE3261353D1 (en) 1985-01-10
EP0065375B1 (de) 1984-11-28

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