GB754445A - Improvements relating to drawing apparatus - Google Patents

Improvements relating to drawing apparatus

Info

Publication number
GB754445A
GB754445A GB226154A GB226154A GB754445A GB 754445 A GB754445 A GB 754445A GB 226154 A GB226154 A GB 226154A GB 226154 A GB226154 A GB 226154A GB 754445 A GB754445 A GB 754445A
Authority
GB
United Kingdom
Prior art keywords
rail
plate
bracket
carriage
drawing board
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
GB226154A
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.)
PHILIP JAMES ROFF
Original Assignee
PHILIP JAMES ROFF
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 PHILIP JAMES ROFF filed Critical PHILIP JAMES ROFF
Priority to GB226154A priority Critical patent/GB754445A/en
Publication of GB754445A publication Critical patent/GB754445A/en
Expired legal-status Critical Current

Links

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

Abstract

754,445. Draughting-machines. ROFF, P. J. (Lehsten, S.). Jan. 26, 1955 [Jan. 26, 1954], No. 2261/54. Class 97 (3). Drawing apparatus comprises a supporting frame including an elongated frame member extending from top to bottom of a drawing board and having at one end a wheeled carriage which travels along a straight guide rail itself secured to an edge of the drawing board, a vertical guide rail secured to said carriage so as to be permanently at right-angles to the path of travel of the carriage and a scale-carrying member slidably mounted upon the vertical guide rail, the scale carrying member having mounted thereon a protractor head and means for attaching linear scales thereto. A hollow member 10, extending slightly obliquely across a drawing-board, is fixed at its end to a large bracket 11 and a smaller bracket 12. Bracket 11 carries grooved rollers 16 which engage a horizontal guide-rail 17 fixed at the top of the drawing board. The bracket 12 has an extension 13 carrying a roller 14 which slides along the bottom of the drawing board or an extension thereof. Brackets 11 and 12 are joined by a vertical guide-rail 18 of oval section which extends at right angles to the direction of movement of the bracket 11. A carriage 19 mounted on rail 18 has cylindrical rollers 20 engaging the underside of rail 17, and a friction brake 31 whereby the assembly can be locked in any position along the horizontal guide rail 17. A scale carrying member 32 has grooved rollers 33 engaging the vertical rail 18. A flat plate 37 is pivoted at 39 to plate 32, and is also pivoted at 41 to a link 40 which is connected to an eccentric 43 mounted on a plate 32, so that the plate 37 can be adjusted. A knob 51 is journalled in plate 37 and carries the arms 47, 48 carrying the scales, which can be set in positions differing by 15 per cent by means of a notch plate (not shown) engaged by a pawl. The scales may be held in intermediate position by a friction brake operating when the pawl is held out of engagement. Plate 32 is normally locked in position along the rail 18 by a friction brake which may be released by operation of lever 36. A cord 62 is connected to plate 32 through a spring 65, passes over pulleys 63 mounted in housings 64 on the bracket 11, and then passes to a counterweight 61 sliding in the tube 10.
GB226154A 1954-01-26 1954-01-26 Improvements relating to drawing apparatus Expired GB754445A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB226154A GB754445A (en) 1954-01-26 1954-01-26 Improvements relating to drawing apparatus

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB226154A GB754445A (en) 1954-01-26 1954-01-26 Improvements relating to drawing apparatus

Publications (1)

Publication Number Publication Date
GB754445A true GB754445A (en) 1956-08-08

Family

ID=9736442

Family Applications (1)

Application Number Title Priority Date Filing Date
GB226154A Expired GB754445A (en) 1954-01-26 1954-01-26 Improvements relating to drawing apparatus

Country Status (1)

Country Link
GB (1) GB754445A (en)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3003243A (en) * 1958-02-06 1961-10-10 Hamilton Mfg Co Combined pencil trough, instrument guard and drafting machine track for drawing board
US3153284A (en) * 1962-08-06 1964-10-20 Harlan N Harris Drafting machine
US3316644A (en) * 1960-07-18 1967-05-02 Keuffel & Esser Co Drafting machine
US3703768A (en) * 1970-02-24 1972-11-28 Mi O Z Sp K Drawing head for use in drawing devices
US3714714A (en) * 1971-02-12 1973-02-06 E Bullard Drafting machine

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3003243A (en) * 1958-02-06 1961-10-10 Hamilton Mfg Co Combined pencil trough, instrument guard and drafting machine track for drawing board
US3316644A (en) * 1960-07-18 1967-05-02 Keuffel & Esser Co Drafting machine
US3153284A (en) * 1962-08-06 1964-10-20 Harlan N Harris Drafting machine
US3703768A (en) * 1970-02-24 1972-11-28 Mi O Z Sp K Drawing head for use in drawing devices
US3714714A (en) * 1971-02-12 1973-02-06 E Bullard Drafting machine

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