US2568575A - Magnetic t square and drafting board - Google Patents

Magnetic t square and drafting board Download PDF

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Publication number
US2568575A
US2568575A US123275A US12327549A US2568575A US 2568575 A US2568575 A US 2568575A US 123275 A US123275 A US 123275A US 12327549 A US12327549 A US 12327549A US 2568575 A US2568575 A US 2568575A
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square
edge
head
drawing board
magnet
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Expired - Lifetime
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US123275A
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Lester F Wickman
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    • 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
    • B43L13/02—Draughting machines or drawing devices for keeping parallelism
    • B43L13/04—Guides for rulers
    • B43L13/048—Guides for rulers with T-squares
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10S33/00—Geometrical instruments
    • Y10S33/01—Magnetic

Definitions

  • This invention relates to T-square construction for use in connection with drawing or drafting boards.
  • the primary object of the invention is to provide means for attracting and holding the head of a T-square against the guiding edge of a drawing board, thereby insuring a straight or perpendicular edge at all times, when the T-square assembly is being moved from the bottom edge of the drafting or drawing board, to the top edge thereof, or vice versa.
  • An important object of the invention is to provide means for insuring a uniform contact between the head of the T-square and drawing board at all times, without the necessity of the draftsman or person using the T-square, applying physical force to maintain a true contact throughout the length of the straight edge of the T-square head and the edge of the drawing board.
  • Figure 1 is a fragmental elevational view of a drawing board, illustrating a T-square, constructed in accordance with the invention, as positioned thereon.
  • Fig. 2 is a rear elevational view of the T-square and one edge of the drawing board.
  • Fig. 3 is a sectional view taken on line 3-3 of Fig. 1.
  • Fig. 4 is a plan view illustrating the head of a T-square as equipped with a modied form of the invention.
  • Fig. 5 is a fragmental perspective view wherein one of the poles of the magnet is illustrated in block form.
  • Fig. 6 is a plan view wherein is shown the use of electro-magnets on a T-square head.
  • Fig. 'l is a diagram illustrating the circuits of the electro-magnet.
  • the reference character 5 indicates a drawing or drafting board, which is provided with a steel bar or armature Ii secured along one edge of the drafting board, as by means of the screws l, that pass through the flange 8 which fits against the bottom of the drafting board adjacent to the edge thereof.
  • the reference character 9 indicates a T-square which is provided with the usual head I3 that contacts one edge of a drawing board when in use.
  • a magnet Secured to the inner edge of the head I0 is a magnet which comprises the bar II, the ends of which terminate adjacent to the ends of the head It).
  • the rollers I2 Pivotally mounted on the bar I I adjacent to the ends thereof, are the rollers I2, the ends of the bar I I being curved downwardly and inwardly towards each other so that the rollers I 2 will contact the armature 6 at a point intermediate the upper and lower edges of the armature 6.
  • the rollers embody high coercive force permanent magnets, one roller constituting the north pole of the magnet, while the other roller constitutes the south pole, to the end that. the head of the T-square supporting the magnet will be drawn into close engagement with the armature 6, as the head is moved to bring the magnet into close contact with the edge of the drawing board.
  • This structure constitutes one which may be readily and easily applied to the usual drawing board and T-square, making use of permanent magnets as a means for holding a T-square in position against a drawing board.
  • the head I3 of this T-square is provided with the magnet including a bar I4, block I5 formed integral with the bar and eX- tending forwardly from one edge of the bar, and the block I6 which extends forwardly from the opposite end of the bar, the block I 5 constituting the north pole of the magnet, while the block I6 constitutes the south pole of the magnet.
  • This magnet cooperates with the steel bar I'I that is secured along one edge of the drafting board, indicated by the reference character I8.
  • Fig. 6 of the drawing I have provided electromagnets I9 and 20 which are disposed adjacent to the ends of the straight edge of the head 2I of this T-square, the electro-magnets I9 and 2D being in circuit with the source of electricity supply 22, which may be in the form of a battery, or the device may be plugged into the usual electric house circuit, through the wires 23 and 24, there being provided a switch 25 for controlling the circuit to the electro-magnets.
  • the source of electricity supply 22 which may be in the form of a battery, or the device may be plugged into the usual electric house circuit, through the wires 23 and 24, there being provided a switch 25 for controlling the circuit to the electro-magnets.
  • electro-magnets cooperate with the steel bar 26 which is secured along one edge of the drawing board, and acts as the armature to cause the T-square to be attracted to the edge of the drawing board when the electric current is applied to the magnets.
  • a drawing board having an armature secured along a longitudinal edge thereof, of a T-square having a head providing a straight edge
  • a permanent magnet comprising a bar secured to the head of the T-square, the ends of the bar being curved downwardly and inwardly, magnet pole members embodying rollers secured to the downwardly and inwardly curved ends of the bar, cooperating with -the armature in holding the head of the T-square to one edge of the drawing board.

Description

Sept. 18, 1951 L. F. wlcKMAN 2,568,575
MAGNETIC T SQUARE AND DRAFTING BOARD Filed Oct. 24, 1949 2 Sheets-Sheet 1 L WU/bmm INVENTOR l l BY l f l 1 ATTORNEYS.
Sept. 18, 1951 L. F. wlcKMAN MAGNETIC T SQUARE AND DRAFTING BOARD 2 Sheets-Sheet 2 Filed oct. 24, 1949 INVENTOR ATTORNEYS Patented Sept. 1.8,K 1951 UNITED STATES PATENT OFFICE MAGNETIC T SQUARE AND DRAFTIN G BOARD 1 Claim.
This invention relates to T-square construction for use in connection with drawing or drafting boards.
The primary object of the invention is to provide means for attracting and holding the head of a T-square against the guiding edge of a drawing board, thereby insuring a straight or perpendicular edge at all times, when the T-square assembly is being moved from the bottom edge of the drafting or drawing board, to the top edge thereof, or vice versa.
An important object of the invention is to provide means for insuring a uniform contact between the head of the T-square and drawing board at all times, without the necessity of the draftsman or person using the T-square, applying physical force to maintain a true contact throughout the length of the straight edge of the T-square head and the edge of the drawing board.
With the foregoing and other objects in View which will appear as the description proceeds, the invention consists of certain novel details of construction and combinations of parts, hereinafter more fully described and pointed out in the claim, it being understood that changes may be made in the construction and arrangement of parts without departing from the spirit of the invention as claimed.
Referring to the drawings:
Figure 1 is a fragmental elevational view of a drawing board, illustrating a T-square, constructed in accordance with the invention, as positioned thereon.
Fig. 2 is a rear elevational view of the T-square and one edge of the drawing board.
Fig. 3 is a sectional view taken on line 3-3 of Fig. 1.
Fig. 4 is a plan view illustrating the head of a T-square as equipped with a modied form of the invention.
Fig. 5 is a fragmental perspective view wherein one of the poles of the magnet is illustrated in block form.
Fig. 6 is a plan view wherein is shown the use of electro-magnets on a T-square head.
Fig. 'l is a diagram illustrating the circuits of the electro-magnet.
Referring to the drawing in detail, the reference character 5 indicates a drawing or drafting board, which is provided with a steel bar or armature Ii secured along one edge of the drafting board, as by means of the screws l, that pass through the flange 8 which fits against the bottom of the drafting board adjacent to the edge thereof.
The reference character 9 indicates a T-square which is provided with the usual head I3 that contacts one edge of a drawing board when in use.
Secured to the inner edge of the head I0 is a magnet which comprises the bar II, the ends of which terminate adjacent to the ends of the head It). Pivotally mounted on the bar I I adjacent to the ends thereof, are the rollers I2, the ends of the bar I I being curved downwardly and inwardly towards each other so that the rollers I 2 will contact the armature 6 at a point intermediate the upper and lower edges of the armature 6. the rollers embody high coercive force permanent magnets, one roller constituting the north pole of the magnet, while the other roller constitutes the south pole, to the end that. the head of the T-square supporting the magnet will be drawn into close engagement with the armature 6, as the head is moved to bring the magnet into close contact with the edge of the drawing board.
This structure constitutes one which may be readily and easily applied to the usual drawing board and T-square, making use of permanent magnets as a means for holding a T-square in position against a drawing board.
In the form of the invention as shown by Fig. 4 of the drawings, the head I3 of this T-square, is provided with the magnet including a bar I4, block I5 formed integral with the bar and eX- tending forwardly from one edge of the bar, and the block I6 which extends forwardly from the opposite end of the bar, the block I 5 constituting the north pole of the magnet, while the block I6 constitutes the south pole of the magnet. This magnet cooperates with the steel bar I'I that is secured along one edge of the drafting board, indicated by the reference character I8.
In Fig. 6 of the drawing I have provided electromagnets I9 and 20 which are disposed adjacent to the ends of the straight edge of the head 2I of this T-square, the electro-magnets I9 and 2D being in circuit with the source of electricity supply 22, which may be in the form of a battery, or the device may be plugged into the usual electric house circuit, through the wires 23 and 24, there being provided a switch 25 for controlling the circuit to the electro-magnets.
These electro-magnets cooperate with the steel bar 26 which is secured along one edge of the drawing board, and acts as the armature to cause the T-square to be attracted to the edge of the drawing board when the electric current is applied to the magnets.
From the foregoing it will be seen that due to the construction shown and described, I have provided an attachment which may be used in connection with T-squares and drawing boards, for holding a T-square into close engagement with one edge of a drawing board to insure a straight or perpendicular edge at all times when moving the T-square assembly along one edge of a drawing board.
Having thus described the invention, what is Claimed is:
The combination with a drawing board having an armature secured along a longitudinal edge thereof, of a T-square having a head providing a straight edge, a permanent magnet comprising a bar secured to the head of the T-square, the ends of the bar being curved downwardly and inwardly, magnet pole members embodying rollers secured to the downwardly and inwardly curved ends of the bar, cooperating with -the armature in holding the head of the T-square to one edge of the drawing board.
LESTER F. WICKMAN.
REFERENCES CITED The following references are of record in the le of this patent:
UNITED STATES PATENTS Number Name Date VRe.11,189 Carr Sept. 15, 1891 926,247 Draper June 29, 1909 2,420,090 Nelsion May 6, 1947 FOREIGN PATENTS Number Country Date 15,657 Germany 1-- Oct. 13, 1881 Switzerland July 2, 1928
US123275A 1949-10-24 1949-10-24 Magnetic t square and drafting board Expired - Lifetime US2568575A (en)

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Cited By (20)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE961867C (en) * 1954-07-17 1957-04-11 Edmond Paul Girard Drawing device
US2793739A (en) * 1954-08-13 1957-05-28 Francis E Callery Measuring device for slug casting machines
US2882604A (en) * 1953-06-29 1959-04-21 Graham Phillip Graphic machine
US2954609A (en) * 1954-12-27 1960-10-04 Henry S Goertz Drafting instrument
US3106789A (en) * 1961-03-27 1963-10-15 Math Master Labs Inc Desk and interpolator combination
US3145589A (en) * 1961-03-14 1964-08-25 Jonker Business Machines Inc Combined drill guide and inspection device
US3214119A (en) * 1964-01-13 1965-10-26 Gaertner Scient Corp Movable carriage and mount
US3269023A (en) * 1963-07-29 1966-08-30 Chauncey L Calkins Micrometer level
US3499225A (en) * 1969-03-10 1970-03-10 Percy A Darrah Magnetically attached ironworker tool
US3720849A (en) * 1970-06-16 1973-03-13 A Bardocz Magnetic-kinematic precision stages
US3826006A (en) * 1971-05-13 1974-07-30 E Rushin Tri-square drawing board
FR2453027A1 (en) * 1979-04-03 1980-10-31 Reppisch Werke Ag DRAWING DEVICE
US4267656A (en) * 1979-09-04 1981-05-19 Esselte Pendaflex Corp. Copy holder
US4383375A (en) * 1981-03-05 1983-05-17 Plan Hold Corporation Drafting apparatus
US4577415A (en) * 1980-05-14 1986-03-25 Saul Schiller Windowed indexed calibrated T-square and precision-lined drafting board having linear edges
US5077904A (en) * 1990-11-14 1992-01-07 Michael James K Drafting apparatus
US5148612A (en) * 1986-11-03 1992-09-22 Industrie-Und-Handels-Ag Apparatus for measuring distances on a workpiece, and sliding gage designed for the digital measurement of such distances
US20040143982A1 (en) * 2002-12-02 2004-07-29 Braun Robert O. Rolling square
US20080093319A1 (en) * 2006-10-19 2008-04-24 Universal Display & Fixtures Company Storage Rack Sliding Frame Apparatus
US20130326895A1 (en) * 2012-06-08 2013-12-12 George Bureau Extendable Level

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE15657C (en) * L. BURLET in Neustadt a. d. Haardt New on the drawing board and hoop rail
US926247A (en) * 1908-02-13 1909-06-29 James C Draper Magnetic t-square.
CH126838A (en) * 1927-04-16 1928-07-02 Wilhelm Froehlich Drawing device.
US2420090A (en) * 1945-06-23 1947-05-06 Paul A Nelson Straightedge protractor

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE15657C (en) * L. BURLET in Neustadt a. d. Haardt New on the drawing board and hoop rail
US926247A (en) * 1908-02-13 1909-06-29 James C Draper Magnetic t-square.
CH126838A (en) * 1927-04-16 1928-07-02 Wilhelm Froehlich Drawing device.
US2420090A (en) * 1945-06-23 1947-05-06 Paul A Nelson Straightedge protractor

Cited By (21)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2882604A (en) * 1953-06-29 1959-04-21 Graham Phillip Graphic machine
DE961867C (en) * 1954-07-17 1957-04-11 Edmond Paul Girard Drawing device
US2793739A (en) * 1954-08-13 1957-05-28 Francis E Callery Measuring device for slug casting machines
US2954609A (en) * 1954-12-27 1960-10-04 Henry S Goertz Drafting instrument
US3145589A (en) * 1961-03-14 1964-08-25 Jonker Business Machines Inc Combined drill guide and inspection device
US3106789A (en) * 1961-03-27 1963-10-15 Math Master Labs Inc Desk and interpolator combination
US3269023A (en) * 1963-07-29 1966-08-30 Chauncey L Calkins Micrometer level
US3214119A (en) * 1964-01-13 1965-10-26 Gaertner Scient Corp Movable carriage and mount
US3499225A (en) * 1969-03-10 1970-03-10 Percy A Darrah Magnetically attached ironworker tool
US3720849A (en) * 1970-06-16 1973-03-13 A Bardocz Magnetic-kinematic precision stages
US3826006A (en) * 1971-05-13 1974-07-30 E Rushin Tri-square drawing board
FR2453027A1 (en) * 1979-04-03 1980-10-31 Reppisch Werke Ag DRAWING DEVICE
US4327499A (en) * 1979-04-03 1982-05-04 Reppisch-Werke Ag Drafting apparatus
US4267656A (en) * 1979-09-04 1981-05-19 Esselte Pendaflex Corp. Copy holder
US4577415A (en) * 1980-05-14 1986-03-25 Saul Schiller Windowed indexed calibrated T-square and precision-lined drafting board having linear edges
US4383375A (en) * 1981-03-05 1983-05-17 Plan Hold Corporation Drafting apparatus
US5148612A (en) * 1986-11-03 1992-09-22 Industrie-Und-Handels-Ag Apparatus for measuring distances on a workpiece, and sliding gage designed for the digital measurement of such distances
US5077904A (en) * 1990-11-14 1992-01-07 Michael James K Drafting apparatus
US20040143982A1 (en) * 2002-12-02 2004-07-29 Braun Robert O. Rolling square
US20080093319A1 (en) * 2006-10-19 2008-04-24 Universal Display & Fixtures Company Storage Rack Sliding Frame Apparatus
US20130326895A1 (en) * 2012-06-08 2013-12-12 George Bureau Extendable Level

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