US3341946A - Drawing apparatus - Google Patents

Drawing apparatus Download PDF

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Publication number
US3341946A
US3341946A US407627A US40762764A US3341946A US 3341946 A US3341946 A US 3341946A US 407627 A US407627 A US 407627A US 40762764 A US40762764 A US 40762764A US 3341946 A US3341946 A US 3341946A
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US
United States
Prior art keywords
drawing board
magnetic means
magnetic
metallic members
embedded
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 - Lifetime
Application number
US407627A
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English (en)
Inventor
Bullinger Gottlieb
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.)
Clemens Riefler Fabrik Mathematischer Instrumente
Original Assignee
Clemens Riefler Fabrik Mathematischer Instrumente
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 Clemens Riefler Fabrik Mathematischer Instrumente filed Critical Clemens Riefler Fabrik Mathematischer Instrumente
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Publication of US3341946A publication Critical patent/US3341946A/en
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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
    • B43L13/00—Drawing instruments, or writing or drawing appliances or accessories not otherwise provided for

Definitions

  • the present invention relates to a drafting arrangement and, more particularly, consists in the combination of a drawing board consisting of insulating material, one or more sets of parallel narrow elongated magnetizable magnetic members embedded in the drawing board and magnetic means mounted turnably about an axis extending normal to the surface of the drawing board with the poles of these magnetic means located at a small distance from the surface of the drawing board so that the magnetic means interact with the magnetizable metallic members and is caused to turn into alignment with the same.
  • the arrangement according to the present invention includes also a drawing implement preferably mounted on the magnetic means set forth above.
  • FIG. 1 is an elevational view showing the construction on the drawing board and the magnetic arrangement above the board for obtaining alignment in a predetermined direction;
  • FIG. 2 is a plan View of the arrangement of FIG. 1;
  • FIG. 3 is a schematic diagram illustrating the principle for the construction of the drawing board through ernbedding of magnetizable members.
  • FIG. 4 is a functional schematic diagram, and shows an electromagnetic arrangement whereby the alignment of the apparatus, in accordance with the present invention, is accomplished through the operation of a servo system.
  • FIG. 1 a series of parallel magnetizable wires 2 are embedded in non-magnetic or insulating material 1.
  • the material 1 corresponds to a drafting board.
  • the wires 2 may be made, for example, of magnetizable iron.
  • a permanent magnet 4 is located above the drawing board and in contact therewith. Due to the condition that a magnetic circuit will always seek the shortest possible path, the permanent magnet when placed on top of the drawing board 1, tends to align itself with one or more of the wires 2. If the magnet is ice placed at an angle with respect -to these wires rather than parallel therewith, the magnet will move and rotate so that it cornes into alignment with the wires 2.
  • a housing 5 is rotatable about the axis of the magnet, and has attached thereto a ruler 3.
  • the housing 5 also has secured to it a scale 7 which can be placed, if desired, directly upon the ruler.
  • An indicator 6 is rotatable about the axis of the housing and secured to the magnet.
  • the scale 7 may be graduated in angular degrees. The apparatus is used by placing it upon the drawing board 1 and allowing the magnet 4 to align itself with respect to the wires 2 embedded within the drawing board. If now, for example, an angle of 0 is desired, the housing 5 is rotated until the scale 7 reads 0 with respect to the indicator 6.
  • any other desired angle of the scale 7 and hence the ruler 3 may -be Iobtained by rotating the housing so that the indicator points to the desired angle on the scale.
  • FIG. 2 shows the relationship of the parts of FIG. 1 in a top view.
  • FIG. 3 shows the drawing board with the megnetizable wires embedded in it.
  • the magnetic means is of the electromagnetic type.
  • a servo positioning system is applied to actuate the magnet 10.
  • a magnetic field is established through the coils 8 and 9.
  • an error signal is induced within the coils 16 and 17.
  • the coil 16 is located precisely behind coil 17 in the drawing.
  • This error signal is amplified through suitable relay control means and then drives a servo motor which in t-urri positions the magnet 10, by being mechanically coupled thereto.
  • a drafting arrangement comprising, in combination, a drawing board consisting of insulating material; at least one set of parallel narrow elongated magnetizable metallic members embedded in said drawing board of insulating material and extending parallel to the surface thereof and spaced from each other; support means adapted to be placed on said drawing board above said embedded magnetizable narrow elongated metallic members; magnetic means supported by said support means turnably about an axis extending normal to the surface of said drawing board with the poles of said magnetic means located at a small distance from said surface so that said magnetic means interact with said narrow elongated metallic members and is caused to turn into alignment with the same; and a drawing implement mounted on one of said means.
  • a drafting arrangement according to claim 1 wherein said drawing implement is mounted on said support and said drafting arrangement includes a scale means and indicator means, one of said means secured to said drawing implement and the other of said means secured to the magnetic means and rotatable with the latter.
  • a drafting arrangement including electromagnetic coils wound about said magnetic means and providing an electrical signal indicative of any misalignment of said magnetic means with respect to said elongated metallic members; driving means coupled to said electromagnetic means for turning the same; a servo motor coupled to said driving means to provide power for operating the same and driving said magnetic means; relay means connected to said coils and to said servo motor; and an electrical power supply for energizing said coil and said motor so that said relay means 0perates said motor in a direction whereby said magnetic means achieves alignment with said elongated metallic members, the alignment position of said magnetic means corresponding to a null condition of the combined cur- Arents within said coils.
US407627A 1963-11-08 1964-10-30 Drawing apparatus Expired - Lifetime US3341946A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DEB74192A DE1264997B (de) 1963-11-08 1963-11-08 Zeicheneinrichtung mit einem auf eine oder mehrere Grundrichtungen einstellbaren Lineal

Publications (1)

Publication Number Publication Date
US3341946A true US3341946A (en) 1967-09-19

Family

ID=6978150

Family Applications (1)

Application Number Title Priority Date Filing Date
US407627A Expired - Lifetime US3341946A (en) 1963-11-08 1964-10-30 Drawing apparatus

Country Status (5)

Country Link
US (1) US3341946A (de)
AT (1) AT264150B (de)
CH (1) CH443967A (de)
DE (1) DE1264997B (de)
GB (1) GB1092104A (de)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS585800B2 (ja) * 1973-01-31 1983-02-01 タケフジコウギヨウ カブシキガイシヤ 自在平行定規装置
GB8608165D0 (en) * 1986-04-03 1986-05-08 Frazer Design Consultants Ltd Draughting tables &c
DE3835364C1 (de) * 1988-10-15 1990-03-29 Aristo Graphic Systeme Gmbh & Co Kg, 2000 Hamburg, De

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1003900A (en) * 1910-11-17 1911-09-19 Pratt & Whitney Co Magnetic chuck.
US1624538A (en) * 1926-07-15 1927-04-12 John P Lair Magnetic stencil and work holder
US3093919A (en) * 1957-11-18 1963-06-18 Hermann J Holtz Magnetic display arrangement

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE917118C (de) * 1952-02-16 1954-08-26 Gerda Lemme Geb Ziemke Schulwandtafel mit dauerhafter Schreibflaeche
DE1775930A1 (de) * 1966-12-27 1972-02-03 Kugelfischer G Schaefer & Co Vorrichtung zur hochbelastbaren,axialen sowie radialen Lagerung von umlaufenden Teilen

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1003900A (en) * 1910-11-17 1911-09-19 Pratt & Whitney Co Magnetic chuck.
US1624538A (en) * 1926-07-15 1927-04-12 John P Lair Magnetic stencil and work holder
US3093919A (en) * 1957-11-18 1963-06-18 Hermann J Holtz Magnetic display arrangement

Also Published As

Publication number Publication date
AT264150B (de) 1968-08-26
GB1092104A (en) 1967-11-22
DE1264997B (de) 1968-03-28
CH443967A (de) 1967-09-15

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