US2524642A - Drafting instrument - Google Patents

Drafting instrument Download PDF

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Publication number
US2524642A
US2524642A US9650A US965048A US2524642A US 2524642 A US2524642 A US 2524642A US 9650 A US9650 A US 9650A US 965048 A US965048 A US 965048A US 2524642 A US2524642 A US 2524642A
Authority
US
United States
Prior art keywords
plate
bracket
drafting instrument
drafting
ring
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
US9650A
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English (en)
Inventor
Vanet Paul
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.)
Cellophane SA France
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
Application granted granted Critical
Publication of US2524642A publication Critical patent/US2524642A/en
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
    • 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
    • B43L13/06—Guides for rulers with pivoted guide rods

Definitions

  • the present invention relates to an improvement in drafting instruments as commonly employed in drafting rooms, which comprises a system of jointed ,parallelograms permitting a head carrying two rules at right angles which remain constantly parallel to themselves, to be displaced over the entire surface of a drawing board.
  • Fig. 1 is a schematic top plan view of the general arrangement of a drafting instrument embodying the invention
  • Fig. 2 is an elevation showing the essential features of the instrument.
  • Fig. 3 is a top plan view thereof.
  • drafting instruments of the type in question consist essentially of an arrangement of rigid rods.
  • a bracket A secured by screws a to the drawing board (shown dotted)
  • two parallel rods BB are pivoted at b and D
  • the rods are similarly pivoted at their opposite ends to a plate C at c and c
  • Two further rods DD are pivoted at d and d to the plate C, and in turn support a bracket E pivoted at e and e
  • This bracket E serves to support a head such as that described in French Patent No. 872,341 of January 15, 1941.
  • the system of pivots b-b and cc and the system of pivots d-d and ee each form a parallelogram, permitting the bracket E and the rules'attached thereto (schematically shown dotallelograms, which in consequence cease to afford a strictly parallel displacement of the rules'attached to the bracket E.
  • This deformation is particularly marked when the drawing board is disposed horizontally, or nearly so.
  • the object of the invention is to counteract this deformation and to assure accurate operation of the drafting instrument regardless of the position of the plate C, whether outside of the drawing board or in contact with the same. This result is obtained by means of a device, one form of which is shown in Figs. 2 and 3.
  • a shaft F On the bracket A secured to the drawing board, there is mounted a shaft F, preferably located at the midpoint of the distance b -b This shaft carries a concentric sleeve G to which is attached a ring H movable about an imaginary axis Which is determined by two adjustable setscrews J-J,
  • the ring H is provided with a lug K carrying a screw L with the end of its shank bearing upon the sleeve G.
  • the ring H carries a rod M of suitable length and cross section, preferably flexible, whose tip engages a pin N attached to the plate C at the point of intersection of the line c-c and d-d
  • the rod M will pivot about the set screws J, thus raising its end 0 and lifting the plate 0, this motion naturally counteracting the deformation due to the weight of the assembly of rods forming the two joined parallelograms. If the plate C is in contact with the drawing board, its pressure on the board is reduced and may even be entirely eliminated by suitable adjustment of the screw L, thus diminishing or eliminating the friction of that part upon the board.
  • the positions of the pivots F and N may be modified to the extent of simply locating these at two points forming a parallelogram with 11-0.
  • the rod M may also be provided with an extensible portion or a crotch of suitable length permitting the fork O to follow the pivot N throughout all its displacements in which event the pivot points may be displaced from the pivots of the parallelogram.
  • the motion resulting from manipulating the screw L may, be produced by any other mechanical arrangement provided always that the motion obtained permits the application to the plate C or a neighboring portion of the drafting instrument of a force tending to reduce or entirely eliminate the eifect of its weight, this being the essential characteristic of the invention.
  • a bracket to be attached to the board, a plate, a pair of parallel links pivoted to said bracket and said plate to form a parallelogram, a head articulated to said plate for parallel movement over the drawing board, a vertical pin fixed to said bracket at a point centered between the pivot points of said links, a sleeve journalled to rotate thereon, a ring, means pivoting said ring to said sleeve to rotate therewith about the axis of said pin and to pivot on' said sleev about a horizontal axis, and a rod attached to said ring in cantilever relationship and connected at its free end to said plate at a point centered between the pivot points of said links to rigidify the assembly and support said plate, a vertical arm extending upwardly on said ring along said sleeve on the side opposite said plate, and an adjusting screw carried by said arm and bearing against said sleeve for pivotally adjusting said ring and rod to thereby adjust the elevation of

Landscapes

  • Structures Of Non-Positive Displacement Pumps (AREA)
  • Pivots And Pivotal Connections (AREA)
US9650A 1943-05-17 1948-02-20 Drafting instrument Expired - Lifetime US2524642A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR952397T 1943-05-17

Publications (1)

Publication Number Publication Date
US2524642A true US2524642A (en) 1950-10-03

Family

ID=9486592

Family Applications (1)

Application Number Title Priority Date Filing Date
US9650A Expired - Lifetime US2524642A (en) 1943-05-17 1948-02-20 Drafting instrument

Country Status (6)

Country Link
US (1) US2524642A (fr)
BE (1) BE479329A (fr)
CH (1) CH269203A (fr)
FR (1) FR952397A (fr)
GB (1) GB653743A (fr)
NL (1) NL66450C (fr)

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1421921A (en) * 1921-04-22 1922-07-04 Carl F Doerr Rotary glass cutter
US1633629A (en) * 1924-06-24 1927-06-28 Fortin Joseph Ovila Drafting machine
US2019473A (en) * 1934-04-12 1935-11-05 Frederick A Anton Slant adjustment for lateral arm awnings
US2136140A (en) * 1938-07-25 1938-11-08 Dietzgen Co Eugene Drafting apparatus

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1421921A (en) * 1921-04-22 1922-07-04 Carl F Doerr Rotary glass cutter
US1633629A (en) * 1924-06-24 1927-06-28 Fortin Joseph Ovila Drafting machine
US2019473A (en) * 1934-04-12 1935-11-05 Frederick A Anton Slant adjustment for lateral arm awnings
US2136140A (en) * 1938-07-25 1938-11-08 Dietzgen Co Eugene Drafting apparatus

Also Published As

Publication number Publication date
CH269203A (fr) 1950-06-30
GB653743A (en) 1951-05-23
BE479329A (fr)
FR952397A (fr) 1949-11-16
NL66450C (fr)

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