GB988309A - Draughting instruments - Google Patents

Draughting instruments

Info

Publication number
GB988309A
GB988309A GB5498/64A GB549864A GB988309A GB 988309 A GB988309 A GB 988309A GB 5498/64 A GB5498/64 A GB 5498/64A GB 549864 A GB549864 A GB 549864A GB 988309 A GB988309 A GB 988309A
Authority
GB
United Kingdom
Prior art keywords
arm
members
degrees
sleeve
held
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
Application number
GB5498/64A
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
Publication of GB988309A publication Critical patent/GB988309A/en
Expired legal-status Critical Current

Links

Classifications

    • BPERFORMING OPERATIONS; TRANSPORTING
    • B43WRITING OR DRAWING IMPLEMENTS; BUREAU ACCESSORIES
    • B43LARTICLES FOR WRITING OR DRAWING UPON; WRITING OR DRAWING AIDS; ACCESSORIES FOR WRITING OR DRAWING
    • B43L7/00Straightedges
    • B43L7/10Plural straightedges relatively movable
    • B43L7/12Square and pivoted straightedges

Landscapes

  • Drawing Aids And Blackboards (AREA)
  • Gripping Jigs, Holding Jigs, And Positioning Jigs (AREA)
  • Details Of Measuring And Other Instruments (AREA)

Abstract

988, 309. Drawing instruments. F. C. MERRIFIELD. Feb. 10, 1964 [Feb. 12, 1963], No. 5498/64. Heading G1X. A portable drawing instrument comprises a base member 12 having a straight edge 24 to contact a T-square or the like, and an undersurface to ride on the drawing work, an arm 22 extending perpendicularly from the straight edge and spaced above the drawing work, a triangular member 14 pivotally connected to and underlying the arm 22 with its undersurface co-planar with that of the member 12, a protector member 16 pivotally connected to and overlying the member 12 and having graduated indicia lines 40 for determining the position of the triangular member 14, and a coupling unit 18 pivotally connecting the members 14, 16 to the arm 22. The member 12 is formed with a step 26, and the arm 22 is held on the step by an adhesive or a fusion joint. The triangle member may have angles of 45 degrees or 30 degrees and 60 degrees, and may be perforated with circular or elliptical holes as tracing guides. The hypotenuse side of the member 14 may be eliminated reducing the member to a pair of right angularly disposed arms. Indicator lines 44, 46, 48 at known angles are marked on the member 14 and co-operate with the indicia marks 40. The member 16 comprises two joined plates 36, 38, this arrangement enabling a reduction in parallax between the marks 40 and 44, 46, 48 to be attained. The coupling unit 18 Fig. 3 is provided with a sleeve 52 forming the pivot for the members 14,16, the member 14 being held in place by a screw 54. The members 14, 16 are held in frictional engagement with the arm 22 by an annular cup member 58 urged downwardly in Fig. 3 by a spring 64. When it is desired to move the members 14, 16 downward force on a plunger 68 pivots accurately spaced fingers 66 about fulcrums formed by slots in the sleeve 52 to raise the member 58 against the spring 64 and so release the members 14, 16 for pivotal movement about the sleeve.
GB5498/64A 1963-02-12 1964-02-10 Draughting instruments Expired GB988309A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US257960A US3243882A (en) 1963-02-12 1963-02-12 Student's drafting instrument

Publications (1)

Publication Number Publication Date
GB988309A true GB988309A (en) 1965-04-07

Family

ID=22978514

Family Applications (1)

Application Number Title Priority Date Filing Date
GB5498/64A Expired GB988309A (en) 1963-02-12 1964-02-10 Draughting instruments

Country Status (3)

Country Link
US (1) US3243882A (en)
DE (1) DE1461735A1 (en)
GB (1) GB988309A (en)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4657516A (en) * 1985-12-09 1987-04-14 Tomas Tassy Reinflatable life preserver device
US7043850B2 (en) * 2002-08-21 2006-05-16 Brady John R Transparent measuring device with seam allowance guide

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US523733A (en) * 1894-07-31 Drawing-instrument
US795145A (en) * 1905-01-03 1905-07-18 Albert C Loomis Draftsman's triangle.
FR934966A (en) * 1945-07-12 1948-06-07 Extendable drawing device
US2641843A (en) * 1951-12-26 1953-06-16 Marion R Hart Flight position locator

Also Published As

Publication number Publication date
US3243882A (en) 1966-04-05
DE1461735A1 (en) 1968-12-19

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